JPS5943093Y2 - impact wrench control device - Google Patents

Description

[Detailed explanation of the invention] This invention consists of 1. The present invention relates to an impact wrench control device, and particularly to an impact wrench control device suitable for improving tightening accuracy and workability when tightening mass-produced vehicle parts using an impact wrench.

Generally, on an assembly line in an automobile manufacturing factory or the like, assembly of parts and suspension parts is performed by tightening bolts, nuts, and the like.

In conventional screw tightening work, an operator uses an impact wrench to intuitively grasp changes in the impact sound and manage the screw tightening condition and tightening time.

Furthermore, when tightening important parts such as leg parts, the lack of tightening force is compensated for by adding additional tightening work using a torque wrench or the like to the above-mentioned work.

However, in such conventional screw tightening work, although it is possible to determine the approximate degree of tightening and whether the tightening force is insufficient, it is impossible to determine the appropriate tightening force or over-tightening. However, since tightening accuracy largely depends on the skill of each worker, the problem of poor tightening accuracy has been a problem.

Furthermore, there is a problem in that an excessive labor burden is imposed on the worker who also uses a torque wrench due to constraints on working time due to the use of a torque wrench.

This idea was created in view of the above-mentioned conventional problems, and it reduces the labor burden on workers during screw tightening work, accurately confirms the completion of the tightening work, and improves the tightening accuracy. can.

An object of the present invention is to provide an impact wrench control device.

This purpose is to use a reference time circuit in which the screw tightening reference time of the air and impact wrench is set, and the actual screw tightening time detected by the flow valve interlock switch installed in the air line and the screw tightening reference time. Compare with 11
191J circuit, an impact wrench stop device that cuts off the air supply to the impact wrench by the output of the discrimination circuit and depressurizes the air line connected to the impact wrench, and sequentially determines the discrimination results for each tightening screw of the discrimination circuit. a counter to count and at least one
A work delay detection circuit detects the elapsed time from the completion of tightening to the start of the next tightening in one or more screw tightening operations, and when the work delay detection circuit outputs a time of one hour or more, the above-mentioned determination is made. a display device that displays an abnormality through a circuit;
This can be achieved by an impact wrench control device having a '11g1J circuit and a conveyor line stop device that stops the conveyor line in response to an abnormal output from the collar/tar.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing a piping system to which the impact wrench control device according to this invention is applied, and one end of a branch pipe 2 is connected to a main pipe 1 such as factory piping.

The other end of the branch pipe 2 is connected via a drainer 3 to a three-piece set 4 consisting of an air filter, a regulator, and a lubricant.

An air line 5 is connected to the three-point section 4, and the air line 5 is connected to an air cut solenoid valve 6 (hereinafter referred to as CU).
It is connected to an air line 8 via a T solenoid valve 5) and a flow rate valve interlock switch γ, and the air line 8 is further connected to an impact wrench 10 via a curl hose 9.
It is connected to the.

An exhaust solenoid pulp (hereinafter referred to as EX solenoid valve) 11 and an eraser 12 are connected to the air line 8, and the air line 5 and the air line 8 are connected to the CUT solenoid valve 6 by a bypass line 14 having a bypass valve 13. and are connected so as to bypass the flow rate valve interlocking switch 1.

In this configuration, the CUT solenoid valve 6 is normally open and closes when energized to cut off communication between the air lines 5 and 8, and the EX solenoid valve 11 is normally closed and opens when energized to block air communication. The line 8 is opened to the atmosphere via a silencer 12 to reduce the pressure.

That is, by energizing both solenoid pulps 6.11 at the same time, the operation of the impact wrench 10 can be stopped immediately.

Further, the flow rate valve interlocking switch T is configured to operate and generate an output when air is flowing, that is, when the impact wrench 10 is operating.

Note that the bypass valve 13 is manually switched and is normally kept in a closed state.

FIG. 2 is a block circuit diagram showing an embodiment of the impact wrench control device according to this reference.

The reference time circuit 15 sets the screw tightening reference operation time of the impact wrench 10, and includes a reference time timer T1 that sets the reference time corresponding to the regular tightening torque value.
, an interval timer T2 adapted to the waiting time for temporary tightening Tx5 or the average operating time of the process.
T3. It has a built-in T4 etc. and outputs various time signals.

The first output of the reference time circuit 15 is configured to open and close the CUT solenoid valve 6, and the second output is configured to open and close the CUT solenoid valve 6.
The solenoid pulp 11 is opened and closed.

Further, the third output of the reference time circuit 15 is output from the discrimination circuit 16.
and is transmitted to the work delay detection circuit 18.

In addition to the outputs of the reference time circuit 15 and the work delay detection circuit 18, the output of the flow rate valve interlocking switch T is transmitted to the determination circuit 16.

The determination circuit 16 compares the output of the reference time circuit 15 with the output of the flow rate valve interlocking switch T to determine whether or not the actual screw tightening work has been completed within a proper time.

The determination result of the determination circuit 16 is transmitted to the display device 1γ, which displays whether the screw tightening operation time is normal or abnormal.

The display device IT utilizes a lamp, a buzzer, etc., and displays various types of information as will be described later, in addition to the appropriateness of the screw tightening time.

The work delay detection circuit 18 detects the elapsed time from the completion of tightening to the start of the next tightening 1 in a plurality of screw tightening operations, and when the elapsed time is longer than a predetermined time, the display device 1
This indicates that there is an abnormality.

Furthermore, the determination results for each tightening screw in the 1Jff1 circuit 16 are sequentially counted by a counter 19 to track whether or not multiple screw tightening operations in the assembly line are being performed properly. , the count results of the counter 19 are transmitted to the display device IT.

The conveyor line stop device 20 is configured to stop the conveyor line when an abnormality occurs, depending on the state of the output of the above-mentioned discrimination circuit 16 or the output of the counter 19.

Next, the operation of the above embodiment will be explained with reference to FIG.

Figure 3 shows the tightening operation of four bolts in the tie-rond tube tightening work of a small passenger car, and the impact wrench 1.
FIG. 2 is an explanatory diagram showing the air pressure P in the air line 8 connected to the air line 8 with respect to time T.

This tie rond tube tightening work is a tightening preparation operation AO such as picking up the impact wrench 10.

First bolt tightening operation 1. Second bolt tightening operation A2. Third
After performing bolt tightening operation A3 and fourth bolt tightening operation A4 in sequence, the tightening operation is completed, and B1
~B4 shows temporary tightening work in each tightening operation.

To explain the tightening operation A1 of the first bolt, /f7
When the air supply valve built into the compact wrench 10 is opened, compressed air is supplied to the impact wrench 10 via the flow rate valve interlocking switch 1, and screw tightening work is started.

At this time, the flow valve is actuated by the air flow in the air line 5, the output signal of the flow valve switch T is transmitted to the reference time circuit 15, and the reference time timer T1 built in the reference time circuit 15 starts timing. do.

When the set time of the reference timer T1 has elapsed, the CUT solenoid and idle valve 6 are closed by the time amplifier signal.

At the same time, the EX solenoid valve 11 opens, and residual air in the air line 8, curl hose 9, and air line 14 is instantly released via the silencer 12, and the air supply to the impact wrench 10 is cut off.

That is, if the operator continues the screw tightening work for a reference time or longer, the air supply to the impact wrench 10 is automatically cut off and the operation is abruptly stopped.

Here, the output signal of the flow rate valve interlocking switch T is compared and determined in the determination circuit 16 with the set time of the reference time timer T1 of the reference time circuit 15, and is transmitted to the display device IT.

If the worker does not continue tightening the screw for longer than the reference time, the discrimination circuit 16 determines that there is an abnormality, and the display device IT
will sound a buzzer to warn the worker that there is insufficient time to tighten the screws, and the display unit 1 will sound unless the worker tightens the screws again.
7 continues to operate.

Furthermore, when a predetermined period of time has elapsed in this state, the conveyor line stop device 20 is activated by the output of the discrimination circuit 16, and the conveyor line is stopped.

When such a screw tightening operation is repeated from the first bolt to the fourth bolt t as the final bolt, the discrimination result of the discrimination circuit 16 for each tightening bolt is determined by the counter 19 as 7.
- The count result of the counter 19 is displayed by a lamp on the display device IT as to whether or not the entire tightening work of the tyrond tube has been completed, and the entire tightening work has not been completed! 11 The conveyor line stop device 20 is configured to be activated after a predetermined time has elapsed.

At this time, in the tightening work from the first bolt to the final bolt 1, if the elapsed time from the completion of tightening one bolt to the start of tightening the next bolt is long and the predetermined time has passed,
The work delay detection circuit 18 generates an output, and the buzzer of the display device IT is sounded via the discrimination circuit 16 to warn the worker of the work delay.

The reference time circuit 15 also includes an interval timer T4 as a waiting time timer for performing temporary tightening work.
It has a built-in tool that allows temporary tightening of bolts, nuts, etc. in the pre-screw tightening process depending on various circumstances such as the shape and size of vehicle parts, the process, and the characteristics of the tool.

Note that the bypass valve 13 enables manual impact tightening work by opening the bypass valve 13 when an abnormality such as a malfunction occurs in the reference time circuit 15 or the CUT solenoid valve 6 or the like.

According to the above embodiment, it is possible to automatically check the completion time of the screw tightening operation and the stop operation of the impact wrench 10, reducing the burden on the operator and stabilizing the screw tightening operation time. Since the standard deviation of the torque value can be reduced to that of the conventional IA, the tightening accuracy can be greatly improved.

Further, in the tightening work of important leg parts, the checking work using a conventionally used QL wrench or the like can be eliminated, so that the labor burden on the worker can be reduced.

Furthermore, since a timer is built into the reference time path 15 to enable temporary tightening work, it can be applied to a wide range of screw tightening processes.

In addition, as a foolproof measure, when the operating time of the impact wrench 10 is less than Tl or A in FIG.
4. If the four operations are not completed, the conveyor is configured to stop after a predetermined period of time has elapsed.

Further, the system is configured to issue a warning with a buzzer and a lamp when there is a work delay exceeding T2 as a tightening abnormality warning.

As described above, the impact wrench control device according to this invention has a reference time circuit that sets the screw tightening standard time of the air impact wrench, and a screw tightening that is detected by the flow valve interlocking switch installed in the air line. a determination circuit that compares the actual tightening time with the screw tightening reference time;
An impact wrench stop device that cuts off the air supply to the impact wrench and depressurizes the air line connected to the impact wrench by the output of the half J531J circuit, and the discrimination results for each tightening screw of the discrimination circuit.
@A counter that counts the next time, a work delay detection circuit that detects the elapsed time from the completion of tightening to the start of the next tightening in at least one or more screw tightening operations, and a work delay detection circuit that detects the elapsed time from the completion of tightening to the start of the next tightening in at least one or more screw tightening operations, and This device has a display device that displays an abnormality through the discrimination circuit when the time is output, and a conveyor line stop device that stops the conveyor line based on the abnormal output from the discrimination circuit and the counter. This has the effect of reducing the labor burden in the tightening work, accurately confirming the completion of the tightening work, and improving the tightening accuracy.

[Brief explanation of drawings]

Fig. 1 is a piping system diagram showing an air circuit to which the impact wrench control device according to this invention is applied, Fig. 2 is a block diagram showing an embodiment of the impact wrench control device according to this invention, and Fig. 3 is the same. It is an explanatory view showing an operating state. 6-... Air cut-on renoid valve, T-... Flow rate Hartz interlocking switch, 5.8-... Air line, 1
0-°° impact wrench, 11--exysdornoid valve, 12--silencer, 15--reference time circuit, 16--discrimination circuit, 1γ--display device,
18...Work delay determination circuit, 19-...Counter, 2
0...Conveyor stop device.

Claims (1)

[Scope of utility model registration request] A reference time circuit that sets the screw tightening reference time of the air impact wrench, and the actual screw tightening time detected by the flow valve interlock switch installed in the air line connected to the impact wrench and the screw tightening. a determination circuit that compares the time with a reference time; an impact wrench stop device that cuts off the air supply to the impact wrench and depressurizes the air line connected to the impact wrench based on the output of the determination circuit; and a determination circuit for each tightening screw of the determination circuit. A counter that sequentially counts the determination results, a work delay detection circuit that detects the elapsed time from the completion of tightening to the start of the next tightening in at least one or more screw tightening operations, and a predetermined time from the work delay detection circuit. An impact wrench control device comprising: a display device that displays an abnormality via the discrimination circuit when the above time period is output; and a conveyor line stop device that stops the conveyor line based on the abnormal output from the discrimination circuit and the counter.