JPH0644576Y2 - Loosening device for fastening members - Google Patents

Loosening device for fastening members

Info

Publication number
JPH0644576Y2
JPH0644576Y2 JP2600289U JP2600289U JPH0644576Y2 JP H0644576 Y2 JPH0644576 Y2 JP H0644576Y2 JP 2600289 U JP2600289 U JP 2600289U JP 2600289 U JP2600289 U JP 2600289U JP H0644576 Y2 JPH0644576 Y2 JP H0644576Y2
Authority
JP
Japan
Prior art keywords
nut runner
fastening member
nut
direction
bolts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2600289U
Other languages
Japanese (ja)
Other versions
JPH02117837U (en
Inventor
幹雄 相原
義昭 蓑島
Original Assignee
マツダ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by マツダ株式会社 filed Critical マツダ株式会社
Priority to JP2600289U priority Critical patent/JPH0644576Y2/en
Publication of JPH02117837U publication Critical patent/JPH02117837U/ja
Application granted granted Critical
Publication of JPH0644576Y2 publication Critical patent/JPH0644576Y2/en
Active legal-status Critical Current

Links

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a fastening member loosening device.

"Prior Art" An apparatus for loosening a fastening member such as a nut and a bolt includes a nut runner capable of engaging with the nut, and an elevating means for moving the nut runner up and down. Then, in the operation, first, the elevating means operates, the nut runner is lowered to engage the nut runner with the nut, then the nut runner reversely rotates to loosen the nut, and then the elevating means operates again, Raise the nut runner to disengage the nut runner from the nut.

As described above, in the fastening member loosening device, the fastening members such as nuts and bolts are loosened by the vertical movement and the reverse rotation of the nut runner.

As for such a conventional fastening member loosening device, see, for example, Japanese Utility Model Laid-Open No. 60-74919. In the apparatus of this publication, a screw rotating member is provided below the work pedestal, and the screw rotating member has an upright socket engageable with a bolt, a nut, or the like.

[Problems to be Solved by the Invention] In the conventional fastening member loosening device as described above, first, the elevating means is operated to lower the nut runner to engage the nut runner with the nut, and then the nut runner When the nut runner rotates further after the nut runner completes the loosening operation of the nut, the nut runs off the bolt and spins freely. May be damaged.

When the nut runner rotates in the reverse direction and the loosening of the nut is completed, the elevating means operates again to raise the nut runner and disengage the nut runner from the nut.At this time, the nut bites into the nut runner. The nut runner may not come off from the nut runner.

An object of the present invention is to prevent the fastening member from being damaged due to idling of the fastening member, and further to prevent the fastening member from biting into the nut runner when the nut runner is disengaged from the fastening member. It is to provide a loosening device for a member.

[Means for Solving the Problems] The present invention is a loosening device for a fastening member that loosens the fastening member by rotating the fastening member, the device for engaging the fastening member and rotating the fastening member in the tightening direction. A nut runner capable of rotation and reverse rotation for rotating the fastening member in a loosening direction, engaging the nut runner with the fastening member, and moving the nut runner in the engaging direction and the releasing direction so as to release from the fastening member. Moving means, a nut runner capable of forward and reverse rotation, a torque detecting means for detecting a torque applied to the nut runner, a control means for controlling the nut runner and the moving means,
The control means actuates the moving means, moves the nut runner in the engaging direction to engage the nut runner with the fastening member, and positively rotates until the torque from the torque detecting means reaches a predetermined value, After the normal rotation, the nut runner is rotated in the reverse direction, the rotation of the nut runner is stopped by 1 o'clock before the fastening member is completely loosened, and the nut runner is controlled within the range where the engagement between the nut runner and the fastening member is maintained by controlling the moving means. It is characterized in that the nut runner is moved in the releasing direction and the nut runner is rotated in the reverse direction again to completely loosen the fastening member.

[Operation] In the present invention, first, a nut runner for rotating a fastening member such as a bolt and a nut in a tightening direction (forward rotation) and a loosening direction (reverse rotation) is rotatably engaged with the fastening member. In this case, first, in order to confirm whether or not the nut runner is engaged with the fastening member, the control means rotates the nut runner in the forward direction to confirm whether or not a predetermined tightening torque is generated. As a result, when a predetermined torque is generated, it is determined that the nut runner is engaged with the fastening member, and thereafter, the loosening operation of the fastening member is started.

As a result, it is possible to prevent the fastening member from being damaged by the idling of the nut runner.

In this loosening operation, the nut runner is reversely rotated, but the feature of the present invention is that this reverse rotation does not continue until the fastening member is completely loosened, but the fastening member is still slightly moved between the workpiece and the fastened element. In the state where the engaging force remains, the reverse rotation is stopped once and the engaging state of the nut runner with the fastening member is changed.
Therefore, the control means controls the moving means to move the nut runner slightly in the releasing direction from the fastening member in a state where the nut runner is stopped during the loosening operation.
By doing so, the engagement between the nut runner and the fastening member is released from the previously engaged state and recombined into another engaged state.

This is because it has been experienced that if the nut runner is continuously rotated in the loosening operation in the reverse direction to completely loosen the fastening member, the fastening member will hit the nut runner.

During the loosening operation as described above, the fastening member
Since the nut runner retains the engaging force with the element to be fastened, the nut runner can be reliably moved separately from the fastening member.

After that, the control means again reversely rotates the nut runner until the fastening member is completely loosened, and the loosening operation is completed. Since the engaging force acting between the nut runner and the fastening member after once changing the engagement state between the nut runner and the fastening member is extremely small compared to the engaging force at the early stage of the loosening operation, the nut runner is There is no concern that it will bite you. Therefore, the nut runner can start the next loosening operation without hindrance.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a fastening device loosening device, which is used to loosen the bolts of a bearing cap of a differential carrier.

In FIG. 1, reference numeral 10 indicates a differential carrier, and the differential carrier 10 is held on a transport pallet 14 of a transport conveyor 12. The differential carrier 10 has a drive pinion shaft 16 rotatably supported therein.

The diff carrier 10 includes a diff carrier body 18, a bearing cap 20 coupled to the diff carrier body 18,
Reference numeral 22 indicates a joint surface between the diff carrier main body 18 and the bearing cap 20. And differential carrier 10
In the manufacturing process of, the diff carrier main body 18 and the bearing cap 20 are connected to each other and the cap tightening bolts 24, 24
Fixed with, differential carrier body 18 and bearing cap
Shaft hole 26 is formed over both of 20, and then
Loosen the bolts 24, 24 to disassemble the diff carrier body 18 and the bearing cap 20. Then the diff carrier body
After performing predetermined processing and attaching members to the shaft hole 26 of the bearing cap 20 and the bearing cap 20, the diff carrier main body 18 and the bearing cap 20 are connected again and fixed with the cap tightening bolts 24, 24.

In the manufacturing process of the differential carrier 10, the fastened bolts 24, 24 are once loosened, and the nut runner 30 is used for the loosening operation of the bolts 24, 24.

The nut runner 30 includes a vertically movable frame 32, and the frame 32 has rotary drive devices 34, 34. The shaft 36, 36 of the rotary drive device 34, 34 has a spring
The sockets 40, 40 are drivingly coupled via the holes 38, 38 so as to be movable in the axial direction.
It is configured to be engaged with 24, 24.

Then, the frame 32 descends so that the sockets 40, 40 engage with the bolts 24, 24, and thereafter, the rotary drive device 3
When the sockets 40, 40 are rotated by driving the sockets 4, 34, the bolts 24, 24 engaged with the sockets 40, 40 are loosened.

Next, FIG. 2 is a block circuit diagram showing the structure of a fastening member loosening device according to an embodiment of the present invention.

In FIG. 2, reference numeral 30 is a nut runner that engages with the bolts 24, 24 and loosens the bolts 24, 24 by rotation,
Reference numeral 42 is an elevating means for elevating the nut runner 30, that is, the elevating means 42 is a nut runner 30.
Is lowered to engage the nut runner 30 with the bolts 24, 24, or the nut runner 30 is raised to disengage the nut runner 30 from the bolts 24, 24. The elevating means 42 is hydraulically operated by the valve controller 44.

Reference numeral 46 is a control device that controls the rotation of the nut runner 30 and controls the operation of the elevating means 42 via the valve controller 44. Reference numeral 48 is a torque detecting means for detecting a torque applied to the nut runner 30, and reference numerals 50 and 52 are a first timer for setting a first set time and a second timer for setting a second set time, respectively. It is a timer. The controller 46 is connected to the torque detecting means 48, the first timer 50, and the second timer 52, and controls the rotation of the nut runner 30 and the operation of the elevating means 42 as described below. To do.

FIG. 3 is a flow chart of a fastening member loosening device according to an embodiment of the present invention.
According to this flowchart, the rotation of the nut runner 30 and the operation of the elevating means 42 are controlled.

In FIG. 3, start at step 100, then step 1
When the work is confirmed in 02, the lifting means 42 is operated in step 104.
To lower the nutrunner 30 and
30 is engaged with the bolts 24, 24, and the nut runner 30 is normally rotated in step 106 to tighten the bolts 24, 24.

When the torque applied to the nut runner 30 is detected by the torque detecting means 48 in step 108 and the torque reaches the set torque in step 110, the normal rotation of the nut runner 30 is stopped in step 112 and the first timer 50 is turned on in step 114. At the same time, in step 116, the nut runner 30 is reversely rotated to loosen the bolts 24, 24.

Then, when the first set time set by the first timer 50 has elapsed in step 118, the reverse rotation of the nut runner 30 is stopped in step 120, the elevating means 42 is operated in step 122, and the nut runner 30 is raised. Nutrunner
After disengaging 30 from bolts 24, 24, step 124
To operate the lifting means 42 to lower the nut runner 30 to engage the nut runner 30 with the bolts 24, 24, and
At step 126, the second timer 52 is activated at step 126.
The nut runner 30 is rotated in the reverse direction again to loosen the bolts 24, 24, and the second timer 52 is set by the second timer 52 in step 130.
When the set time has elapsed, the nutrunner 30
Reverse rotation is stopped, and the elevating means 42 is operated in step 134 to raise the nut runner 30 to disengage the nut runner 30 from the bolts 24, 24, and the end is reached in step 136.

In this way, when the torque detected by the torque detecting means 48 becomes the set torque and the nut runner 30 is securely engaged with the bolts 24, 24, the normal rotation of the nut runner 30 is stopped and the nut runner 30 is set to the first timer. Since the bolts 24, 24 are loosened by rotating the bolts 24, 24 backward by the time set by the 50 and the second timer 52, it is possible to prevent the bolts 24, 24 from being damaged by the idling of the bolts 24, 24.

Also, while the nut runner 30 is loosening the bolts 24, 24, the nut runner 30 is temporarily stopped and
After raising 30 to release the engagement with the bolts 24, 24,
Since the nut runner 30 is lowered again and engaged with the bolts 24, 24, it is possible to prevent the bolts 24, 24 from biting into the nut runner 30.
When the nut runner 30 is disengaged from the bolts 24, 24 after the loosening operation of the bolts 24, 24 by the
It is possible to prevent the 24, 24 from biting into the nut runner 30.

[Advantage of Invention] As described above, according to the present invention, it is possible to prevent the fastening member from being damaged due to the idling of the fastening member.
When the nut runner is disengaged from the fastening member, it is possible to prevent the fastening member from biting into the nut runner.

[Brief description of drawings]

FIG. 1 is an explanatory view of a fastening member loosening device used to loosen a bolt of a bearing cap of a differential carrier, and FIG. 2 is a block circuit diagram of a fastening member loosening device according to an embodiment of the present invention, and FIG. 3 is a flowchart of a fastening member loosening device according to an embodiment of the present invention. 24, 24 ... Bolt, 30 ... Nut runner, 40, 40 ... Socket, 42 ... Lifting means, 44 ... Valve controller, 46 ... Control device, 48 ... Torque detecting means, 50 ... First timer , 52 …… Second timer, 100-136 …… Step.

Claims (1)

[Scope of utility model registration request]
1. A loosening device for a fastening member that loosens the fastening member by rotating the fastening member, comprising forward rotation for engaging the fastening member and rotating the fastening member in a fastening direction, and for loosening the fastening member. A nut runner capable of rotating in the reverse direction and a moving means for engaging the nut runner with a fastening member and moving the nut runner in the engaging direction and the releasing direction to release the nut runner from the fastening member; A nut runner, torque detection means for detecting torque applied to the nut runner, control means for controlling the nut runner and moving means,
The control means actuates the moving means, moves the nut runner in the engaging direction to engage the nut runner with the fastening member, and positively rotates until the torque from the torque detecting means reaches a predetermined value, After the normal rotation, the nut runner is rotated in the reverse direction, and the rotation of the nut runner is stopped at 1 o'clock before the fastening member is completely loosened. A fastening member loosening device, wherein the fastening member is moved in the releasing direction, and the nut runner is rotated in the reverse direction again to completely loosen the fastening member.
JP2600289U 1989-03-07 1989-03-07 Loosening device for fastening members Active JPH0644576Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2600289U JPH0644576Y2 (en) 1989-03-07 1989-03-07 Loosening device for fastening members

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2600289U JPH0644576Y2 (en) 1989-03-07 1989-03-07 Loosening device for fastening members

Publications (2)

Publication Number Publication Date
JPH02117837U JPH02117837U (en) 1990-09-20
JPH0644576Y2 true JPH0644576Y2 (en) 1994-11-16

Family

ID=31247230

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2600289U Active JPH0644576Y2 (en) 1989-03-07 1989-03-07 Loosening device for fastening members

Country Status (1)

Country Link
JP (1) JPH0644576Y2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6182756B2 (en) * 2013-07-05 2017-08-23 富士通周辺機株式会社 Screw loosening device

Also Published As

Publication number Publication date
JPH02117837U (en) 1990-09-20

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