JPS601987Y2 - Attachment for bolt tightening machine - Google Patents

Description

[Detailed description of the invention] This invention is designed to be removably attached to a bolt tightening machine.
This invention relates to an attachment for a bolt tightening machine that detects the actual tightening torque of a nut.

When tightening bolts and nuts using an ordinary bolt tightening machine, the torque method is generally widely used in which the axial force of the bolt to be tightened is managed by tightening torque.

In this case, conventionally, manual inspection methods using a torque wrench have been used to inspect the tightening torque of bolts that have been tightened, but this requires manpower and has poor heat inspection accuracy. Therefore, recently, in order to save labor and improve inspection accuracy, a method has been used to manage the tightening torque of bolts using a torque record that automatically records the tightening torque of each bolt. There is.

This method of managing bolt tightening torque using a torque recorder is as shown in FIG.
The mounting seat 3 provided at the bottom of the frame of the bolt tightening machine 1 has a reaction force receiving body 4 and a claw 5, and a torque detector 6 (usually a strain gauge is used) is attached to the reaction force receiving body 4. )
Attach the reaction force receiver 7 to cover the socket, fit the socket to the bolt or nut to be tightened, turn on the switch 8 to start the bolt tightening machine 1, and tighten the claw 5 of the reaction force receiver 7. The bolt tightening machine 1 is brought into contact with a nearby protrusion, such as the head of a bolt that has been tightened or a nut.
When a bolt or nut is tightened while being subjected to a reaction torque that is equal in magnitude to the tightening torque of the bolt or nut, the reaction torque is converted into an electric quantity by the torque detector 6 attached to the reaction force receiving body 4. It is converted and output to the torque recorder 9.

The torque recorder 9 operates at the same time as the switch 8 of the bolt tightening machine 1 is turned on, inputs the output of the torque detector 6, amplifies it, and outputs a reaction torque, that is, a bolt, to the polishing section 10.
The tightening torque of nuts is continuously recorded, and if the tightening torque of bolts or nuts exceeds the upper and lower limits set in the torque recorder 9, an alarm is issued by the alarm 11 to notify the operator of any abnormality. Warns of tightening conditions, such as over-tightening, under-tightening, joint rotation of bolts and nuts, and when bolts are stretched, and manages bolt tightening torque by ensuring that bolt tightening torque is within the set value. It is something.

However, with this method of managing tightening torque using a torque recorder, there is no problem when tightening only bolts of the same size in succession, but when tightening several types of bolts and nuts with different sizes, A reaction force receiver with a torque detector attached to it must be prepared for each case, and if a reaction force receiver with a torque detector is not available because it does not correspond to the size of the bolt to be tightened, attach a torque detector to the reaction force receiver. Because of this, it was not possible to make it in time for emergencies, and the torque detector had to be calibrated for reaction force receivers with torque detectors of different sizes for each bolt and nut.

The bolt tightening machine attachment of the present invention was developed to eliminate the above-mentioned drawbacks.The upper part is removably attached to the output side frame and output shaft end of the bolt tightening machine, and the lower part is The reaction force receiver and the socket are detachably attached, and a torque detector is provided on the outer surface of the bolt, so that the tightening torque of a bolt of any size can be detected.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a cross-sectional side view showing an attachment according to an embodiment of the present invention attached to a bolt tightening machine, with a reaction force receiver and a socket attached to the lower part.

The same numbers in FIG. 1 and FIG. 2 indicate the same members.

In the figure, the attachment 12 includes an outer cylinder 13, an intermediate shaft 14, radial bearings 15, 16 and a thrust bearing 17 that rotatably support the intermediate shaft 14 inside the outer cylinder 13.
A spacing tube 18 provided between the radial bearings 15 and 16, the radial bearing 15, the spacing tube 18, and the radial bearing 16
It consists of a snap spring 19 that fixes the.

The outer cylinder 13 has a mounting part 21 that fits into the mounting seat 2 of the bolt tightening machine 1 at the upper part, and a reaction force receiving part 24 to which the reaction force receiver 22 is mounted at the lower part. A reaction force receiver is detachably attached to the attachment seat 2 by attachment bolts 20 and to the lower part of the outer cylinder 13 by attachment bolts 23, respectively.

Further, on the outer surface, a torque detector 28 is provided in which a strain gauge 27 having a lead wire 26 is embedded in a groove 25 using synthetic resin.

The intermediate shaft 14 has a fitting part 29 in its upper part that can be removably fitted to the shaft end 7 of the output shaft of the bolt tightening machine 1, and its lower part protrudes outward from the lower end surface of the outer cylinder 13. The tip has a socket attachment part 33 to which the socket 30 can be detachably attached via a pin 31 and a rubber ring 32 for preventing the pin 31 from coming off.

Next, the operation of the bolt tightening machine attachment 12 having the above-described configuration will be explained.

First, the upper fitting part 29 of the intermediate shaft 14 of the attachment 12 is fitted to the shaft end part 7 of the output shaft of the bolt tightening machine 1, and the upper fitting part 21 of the outer cylinder 13 is fitted to the bolt tightening machine 1.
The outer cylinder 13 is fitted onto the mounting seat 2 of the bolt tightening machine 1 with a plurality of mounting bolts 20.

Next, the socket 3 is attached to the socket mounting portion 33 of the intermediate shaft 14.
0 with the pin 31 and rubber ring 32, and the reaction force receiver 22
is attached to the reaction force receiving attachment part 24 at the lower part of the outer cylinder 13 with a plurality of attachment bolts 23.

After that, when the socket 30 is fitted to the bolt or nut to be tightened and the bolt tightening machine is turned on, the bolt tightening machine 1 starts and the bolt or nut fitted to the socket 30 is tightened. At the same time as starting, the claw 5 of the reaction force receiver 22
' is brought into contact with a nearby protrusion, such as the head of a bolt or a nut that has been tightened, a reaction torque that is equal in magnitude to the tightening torque of the bolt or nut is applied to the attachment 12 via the reaction force receiver 22. The signal is transmitted to the outer cylinder 13.

This reaction torque is converted into an electrical quantity by a torque detector 28 provided on the outer surface of the outer cylinder 13, and the lead wire 2
6 to the torque recorder.

The torque recorder inputs and amplifies the output of this torque detector 28, continuously records the bolt tightening torque in the recording section, and issues an alarm as described above if an abnormal tightening condition occurs. , warn the operator.

If you use several types of bolts and nuts with different sizes in the work of fastening structures, use Attachment 1.
It is only necessary to replace the socket 30 and reaction force receiver 22 installed at the bottom of the attachment 12 with ones that correspond to the dimensions of the bolts and nuts to be tightened. can be used as is).

Further, by simply calibrating the torque detector 28, the tightening torque of bolts and nuts of any size can be accurately detected.

As described above, the bolt tightening machine attachment of the present invention has an upper part that can be detachably attached to the bolt tightening machine, a socket and a reaction force receiver that can be detachably attached to the lower part, and torque detection. Since the device is equipped with a device, the tightening torque of bolts and nuts of any size can be detected by simply replacing the socket and reaction force receiver.

Therefore, there is no need to prepare a reaction force receiver with a torque detector for each bolt or nut of different size as in the conventional case.

In addition, the torque detector only needs to be calibrated for the torque detector installed on the attachment.
- Since there is no need to perform various calibrations, the effects are great, such as improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a method for managing the tightening torque using a torque coder when tightening bolts and nuts using a bolt tightening machine, and FIG. 2 is a cross-sectional side view of one embodiment of the present invention. 12...Attachment, 13...Outer cylinder, 14...Intermediate shaft, 15, 16...
Radial bearing, 17... Thrust bearing, 18.
...Space tube, 21...Mounting part, 24...
... Reaction force receiving part, 27 ... Strain gauge, 28 ... Torque detector, 29 ...
Fitting part, 33... Socket mounting part.

Claims (1)

[Scope of utility model registration request] The upper part has a mounting part that can be removably attached to the output side of a bolt tightening machine, and the lower part has a reaction force receiving part that can be detachably attached to a reaction force receiver, and the outer surface has a torque detection function. an outer cylinder provided with an outer cylinder, a fitting part that can be removably fitted to the shaft end of the output shaft of the bolt tightening machine on the upper part, and a fitting part on the lower part that projects outward from the lower end surface of the outer cylinder. An attachment for a bolt tightening machine, characterized in that it has a socket attachment part to which a socket can be detachably attached, and an intermediate shaft rotatably supported inside the outer cylinder via a bearing.