JPH0253533A - Nut runner - Google Patents

Abstract

PURPOSE:To mechanically and automatically unscrew a nut by providing a moving unit able to approach and separate from a tightened nut, motor in the moving unit and a cylindrical socket, being associated with a motor shaft, on the axial center of a runner. CONSTITUTION:For removal of a nut 7 by a nut runner 80, a socket 99 is externally fitted to this nut 7 by moving a moving unit 88 approaching the nut 7. Before and after the above fitting, by rotating an air motor 90, a socket 96 is rotated on the axial center of the runner through a motor shaft 91, and the nut 7 is unscrewed through the socket part 99. Next in a condition that the moving unit 88 is separated, an operating device 109 is actuated, when a ring 106 is moved to a play end side for the socket 96, an extruding bar 103, integrally formed with this ring 106, is slided to the play end side, extruding the nut 7 in the socket part 99.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a nut runner used for removing a fastening nut that is tightened to integrate a cabin and a chassis, for example in the manufacturing process of a car. It is something.

Conventional technology For example, in the painting process during the manufacturing process of a car, bolts hanging down from the cabin are passed through holes formed in the chassis.
Then, the desired painting work is performed on the body formed by fitting the bolt and nut from below and tightening them to integrate them. The body is then separated from the cabin and chassis by releasing the fastening nuts at the entrance of the assembly line.
At that time, the tightening nut had to be removed manually by an operator using an impact wrench.

Problems to be Solved by the Invention According to the conventional method as described above, it is not easy to remove the nut because the work is done manually by the worker and the heavy impact wrench is held in hand. , the flow of the entire line may be restricted, or sufficient work lines must be secured for manual work. Also, the nut that has come off often remains in the impact wrench, making it difficult to remove it and requiring time to be taken out.

SUMMARY OF THE INVENTION An object of the present invention is to provide a nut runner that can mechanically and automatically remove a nut, and furthermore, can automatically and reliably take out the removed nut.

Means for Solving the Problems In order to achieve the above objects, the nut runner of the present invention has the following features:
A movable body that can freely approach and move away from the fastened nut is provided, a motor is provided on this movable body, and a cylindrical socket that is interlocked with the motor shaft is provided on the runner axis, and the socket is externally connected to the nut. It has a socket portion that can be fitted freely at the free end, and has an extrusion rod inside that can be slid on the runner axis, and when a link that can be moved integrally with the extrusion rod is externally fitted into the socket, An actuating device for moving this ring relative to the socket is provided on the movable body side.

According to the configuration of the present invention, by moving the movable body close to the nut, the socket portion can be externally fitted onto the nut. By operating the motor back and forth, the socket rotates on the runner axis via the motor shaft, and the nut can be removed via the socket. When the actuating device is activated to move the ring toward the free end with respect to the socket, the push rod integrated with the ring slides toward the free end and pushes out the nut inside the socket. .

Actual example An embodiment of the present invention will be described below based on the drawings.

As shown in Figures 1 to 4, a body 1 is formed by a cabin 2 and a chassis 3, and bolts (star bolts) are installed vertically from the front right and rear left of the cabin 2.
4 is passed through a hole 5 formed in the chassis 3 from above, a washer 6 is fitted from below, and a nut 7 is tightened to integrate the parts. 8 indicates a spacer made of rubber or the like.

Here, the ports 4 are distributed, for example, to the left and right, and are hung vertically from a plurality of locations in the front and back, respectively, but the positions where the nuts 7 are applied are diagonally located at one location on the left and one each.
There are two locations in total.

In FIGS. 2 to 5, reference numeral 10 denotes a body conveyance device, and a drive device (cheno) that can be freely engaged and detached between a carrier 12 that is supported and guided by an upper rail 11 and a carrier 12 that is supported and guided by a lower rail 13. )14. A receiver 15 is provided at the L portion of the carrier 12 to support the lower surface of the chassis 3.

Transport path 1 formed by the body transport device 10
A predetermined position in 8 is a stop position of the carrier 12, and here there are a pair of positioning devices 20 for the carrier 12 provided on the left and right sides across the conveyance path 18, and these positioning devices 20.
A lifting device 40 that is disposed on the left and right positions on the side of the conveyor F and that lifts the body 1, and a positioning device 'l12G.
Locking devices 6 are provided at three locations, one between the lifting device 40 and the other, and one location on the lower side of the lifting device 40, and lock the lifted body 1 from the vehicle width direction.
0, the aforementioned locking device 60 at one location on the lower side, and a nut runner 80 disposed near the locking device 60 on the other side diagonally to release the downward facing nut 7, and these nuts. Located near the runner 80,
Dispensing device l for the nut 7 that has escaped from the nut runner 80! 110 are provided with the base frame 19 in common.

The positioning devices 20 are a pair of left and right, and
9, an upper shaft 22 and a lower shaft 23 supported by the holding frame 21 along the transport path 18, and an L that is attached to the upper shaft 22 so as to be swingable from side to side.
shaped member 24, and an engagement piece 26 that is attached to the upper end of the vertical rod portion of this L-shaped member 24 and that has an engagement recess 25 formed inside.
and an L mounted so as to be swingable from side to side via the lower shaft 23.
shaped link 27, and a pin 28 that connects the upper end of this L-shaped link 27 and the horizontal rod portion of the bent member 24 so as to be relatively swingable.
．． 29, a link 34, and a cylinder device 31 which is swingably attached to the holding frame 21 and has a piston rod 30 interlocked with the bow-shaped link 27.

An operating lever 32 is attached to the lower shaft 23, and a detector 33 that can be freely contacted by the operating lever 32 is connected to the holding frame 21.
established in The engagement piece 26 can be engaged with and detached from the side from the side via the engagement recess 25 with respect to the positioning pin 16 from the carrier 12 side.

The pair of left and right lifting devices 40 include a stand 41 erected from the base frame 19, and a pair of front and rear guide rods 4 that are guided up and down by a guide rod 42 attached to the stand 41.
3, a base plate 44 attached between the upper ends of these guide rods 43, a cylinder device 45 for lifting and lowering provided between the base plate 44 and the stand 41, and a pair of front and rear guides 46 provided on the base plate 44. a slide plate 47 that can be moved left and right while being guided by the slide plate 47; a cylinder device 48 for sliding provided between the slide plate 41 and the base plate 44; A pressing member 49 that can freely come into contact with the base plate 44 and a receiving member 51 that is attached to the inner upper part of the base plate 44 via a spring-based centering device 50 are configured so that the receiving member 51 can be centered. It can freely come into contact with the bottom surface of 3.

As shown in FIGS. 2 to 4 and 9 to 12, the locking device 60, which is disposed at three locations, has a mount 61 that is connected to the base frame 19 via a 70-ting base 62.
placed above. The floating base θ2 includes a base plate 63 fixed on the base frame 19, a lower movable base 65 mounted on the base plate 63 via a lower guide device 64 so as to be movable left and right, and these base plates 63 and the lower movable base 65. A lower centering device 66 using a spring is provided between the lower movable base 65, an upper movable base 68 which is attached to the lower movable base 65 via an upper guide device 67 so as to be able to move back and forth, and between both light bases 65 and 68. A pedestal 61 is fixed on an upper movable table 68. This frame 61
A pair of front and rear guide bodies 70 and a movable member 72 that is guided by the guide body 70 via rollers 71 and is movable in the left-right direction are provided on the top. A cylinder device 73 for left and right movement is provided. Two rods 74 are installed through the movable member 72 so as to be able to rise and fall freely, and an elevating member 75 is attached between the upper ends of the rods 74. Rollers 7 attached to both sides of the lifting member 75
θ fits into a cam groove 78 formed in a side plate 77 erected from the pedestal 6111111J, where the cam groove 78 is
It is formed by an upper horizontal part 78a on the side closer to the conveyance path 18, a lower horizontal part 78b on the remote side, and an inclined part 78c communicating between both parts 78a and 78b. Then, the lock piece 7
A locking recess 79a into which the bolt 4 can be fitted is formed at the free end of the locking piece 79.

As shown in FIGS. 1 to 4, a first vertical guide rail 81 is attached to the side surface of the pedestal 61, and a frame is supported and guided by the first guide rail 81 via a first M moving body 82. A first cylinder device 84 for raising and lowering is provided between 83 and the pedestal 61.

The nut runner 80 is provided on the side surface of the frame 83.
A base plate 85 is fixed. A second guide rail 86 in the vertical direction extends from the middle to the bottom of the base plate 85.
A movable body 88 is attached to the base plate 8 and is supported and guided by the second guide rail 86 via the second sliding body 87.
Elevation is performed by a second cylinder device 89 provided between 5 and 5. An air motor 90 is attached to the movable body 88, and a relay shaft 92 is connected to the upward motor shaft 91 by a bottle 93.
4 and the elongated hole 95, a cylindrical socket 96 is inserted into the elongated hole 9.
They are connected to each other so that they can expand and contract within the range of 5. Between the socket 96 and the relay shaft 92, this socket 9
A spring 97 is provided that biases 6 upward (extension). The socket 96 is slidably and rotatably supported and guided by a support member 98, and the upper part (free end) of the socket 96 is formed into a socket part 99 which can be fitted onto the nut 7, and a washer is provided to cover the outside of the upper end. Receiver 100 is installed. Note that the air motor 90 has a torque sensor 101. The motor shaft 91, relay shaft 92, and socket 96 are located linearly on the runner axis 102F, and the socket
An extrusion rod 103 that is slidable on the runner axis 102 is disposed inside the socket 96. A bottle 104 protruding at right angles from the middle of the extrusion rod 103 is attached to the socket 96 to attach the runner. Long hole 10 formed along axis 102
5 and the protruding end extends outwardly through socket 96.
It is fixed to the inner surface of a ring 106 that is fitted onto the outside of the ring 106. Here, the elongated hole 105 prevents the upper surface of the pushing rod 103 from entering the socket part 99 when the bottle 104 is at the lower limit due to its own weight.
Further, the pushing rod 103, which rises against its own weight, is set to project outward from the socket portion 99 through the washer receiver 100. A push plate 107 that pushes up the ring 106 is fitted onto the socket 96 below the ring 106, and a third cylinder device y! provided on the movable body 88! A piston rod 108 is interlocked and connected to the push plate 107. The push plate 107 and the third cylinder device 108 constitute an actuating device 109 that moves the ring 106 relative to the socket 96.

As shown in FIGS. 2 and 6 to 8, the dispensing device 1
Reference numeral 10 includes a chute 111 provided on the pedestal 61, an air nozzle 112 provided on the base frame 19, and the like. The main body 111a of the chute 111 is inclined and penetrates the pedestal 61 so that the transport path 18 side is on the upper side, and the receiving portion 111b at the upper end is connected to the transport path 1.
It is formed in a shape in plan view so as to be located on the outer side and the lower side with respect to 8. Further, the discharge portion 111c at the lower end is connected to a collection box (not shown) or the like via a hose 113. Receiving part 111 with nut runner 80 inside
The air nozzle 112 located on the opposite side from the base frame 19 is attached to the stay 114 from the base frame 19 via a position adjustment tool 115, and the air nozzle 112 is arranged so that the ejection direction is directed toward the corner of the L-shaped receiving part 111b. It is set.

Next, the operation for removing the nut 7 in the above embodiment will be explained.

The body 1 is formed by integrating the cabin 2 and the chassis 3 by tightening nuts 7 at three points, and the chassis 3 is supported on the carrier 12 side by placing the chassis 3 on a support 15. is conveyed on the conveyance path 18 by engaging the drive device 14 .

This carrier 12 is stopped at a predetermined stopping position by being received by a stopper inserted from the side after disengaging from the engagement.

After this stop, the positioning device 20 is first activated. That is, when the positioning device 20 is inactive, the engagement piece 26
is swinging outward and downward as shown by the imaginary line in FIG.

When the cylinder device 31 is extended in this state, the L-shaped sink 27 rotates counterclockwise in the figure via the lower shaft 23, and in conjunction with this, the L-shaped member 24 rotates via the upper shaft 22. It rotates clockwise, so that the engagement piece 26 engages with the positioning pin 16 from the outside through the engagement recess 23, as shown by the solid line in FIG. Such engagement is performed simultaneously from both sides, thereby positioning the carrier 12.

Completion of this positioning is detected by the detector 33.

Next, the body 1 is lifted and centered.

That is, by extending the cylinder device 45 of the lifting device 40, the member 51 of the support member 51 that rises via the base plate 44, etc. comes into contact with the lower surface of the chassis 3, and the chassis 3 is lifted upward from the support member 15. Next, as shown by the imaginary line in FIG.
The pressing part that slides inward and moves together is member 49.
is brought into contact with the outer surface of the chassis 3. In pressing, the member 49 acts on the chassis 3 from both sides, and at this time, the free movement of the alignment device 5 degrees causes the chassis 3 and the receiver to move against the member 5.
1, and centering in the vehicle width direction and correction of inclination in plan view are performed only by the movement of the alignment device 50.

Next, the body 1 is locked by the lock device 2eo. When the locking device 60 is inactive, the locking piece 79 is positioned outwardly and downwardly due to the contraction of the cylinder device 73. In this state, the cylinder device 73 is extended, and the movable member 72 is moved inward under the guidance of the guide body 70. Then, the roller 76 of the elevating member 75, which moves integrally via the rod 74, moves from the lower horizontal portion 78b of the cam groove 78 to the inclined portion 78c.
The elevating member 15 is gradually raised, and the roller 76 moves from the inclined portion 78c to the upper horizontal portion 78.
Since the elevating member 75 is guided to the position a, the elevating member 75 moves inward at the upper limit.

The locking piece 79 integrated with the lifting member 75 also moves in the same way, and after avoiding the carrier 12 etc., it rushes between the cabin 2 and the chassis 3 and locks into the locking recess as shown in FIGS. 2 and 3. It is externally fitted onto the bolt 4 via 79a. The body 1 can be locked by this external fitting acting from both sides, but at this time, it is also possible to externally fit the locking piece 79 at another location (total three locations) where the nut 7 is not acting. , body 1 is not rotated in plan view when locked, and body 1 is not rotated when locked.
When the sides are misaligned, because the four locking parts 79a are formed in a trumpet shape and the pedestal 61 is attached via the floating base 62,
At the time of locking, the pedestal 61 side automatically moves to ensure the locking action.

At the same time, since the nut runner 80 integrated with the frame 61 also moves, even if the body 1 is slightly misaligned, the nut runner 80 can be positioned and centered directly below the napft 7.

Next, the nut 7 is removed by the nut runner 80. That is, first, the first cylinder device 84 is extended to raise the frame 83 to its upper limit, thereby bringing the socket portion 96 closer to the nut 7 as shown by the solid line in FIG. While rotating the socket 96 via the relay shaft 92 and the like, the moving body 88 is raised by contraction of the second cylinder device 89. As a result, the raised socket portion 99 fits onto the nut 7 as shown by the imaginary line (A) in FIG. 1, and the washer 6 is positioned within the washer receiver 100. The movable body 88 is raised more than necessary, and the spring 97 absorbs the excess rise after the intended engagement. Said air motor 9
The rotation of the socket 96 by the rotation of the socket 96 is initially performed in a normal rotation operation (fastening operation). This is to ensure that the socket portion 99 is completely external to the nut 7, and the nut 7 is
It also checks if it is not attached from the beginning. If the nut 7 is completely tightened, the torque sensor 101 detects this and causes the air motor 90 to operate in reverse (removal operation). With the nut 7 completely released from the bolt 4 falling into the socket part 99 and the washer 6 falling into the washer receiver 100, the air motor 90 is stopped and the moving body 88 is lowered. When the nut runner 80 is separated from the chassis 3, the third cylinder device 10g is moved to extend, and air is ejected from the air nozzle 112. Then, the pushing plate 107, which is rising, comes into contact with the ring 106, causing the ring 106 to rise integrally.

Furthermore, the dozing rod 103 that moves integrally with the ring 106 via the bottle 104 rises inside the socket 96, lifts up the nut 7 and washer 6, and pushes them out of the socket part 99. is blown away into the receiving portion 111b of the chute 111 by air from the air nozzle 112.

Then, the nut 7 and washer 6 slide on the main body 111a and are collected in a collection box or the like via the hose 113 from the discharge portion 111C.

As a result, the nut 7 can be removed automatically, and the operation number 4 is opposite to that described above. Therefore, each device 110,
80.60. ．． 40.20 can be returned to the initial state.

The body 1 from which the nut 7 has been removed is carried out via the carrier 12, and then the cabin 2 and chassis 3 are removed.
After being separated into two parts, they are transported on their respective work lines.

As described in the above embodiment, by first rotating the socket 96 in the normal direction by the air motor 90, it is possible to check whether the nut 7 is not attached properly, and the torque sensor 101 detects the problem. By reversing the operation, it is possible to remove the work without any waste.

Effects of the Invention According to the present invention having the above configuration, by moving the movable body close to the nut, the socket portion can be externally fitted to the nut, and by operating the motor before and after this, The socket rotates on the runner axis via the motor shaft, and the screws can be removed from the runner via the socket. With this, the nut can be automatically removed mechanically.Next, with the movable body moved away, the actuating device is activated to move the ring toward the free end with respect to the socket. The push-out rod integrated with this ring can move toward the free end side and push out the nut inside the socket portion, and the nut that has slipped out of the socket can be automatically and reliably taken out.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway front view of a nut runner, FIG. 2 is a plan view of a removal device that is a partial example of the nut runner, and FIG. 3 is a rear view of the same. , Fig. 4 is a partially cutaway side view of the same, Fig. 5 is a rear view of the centering part, Fig. 6 is a rear view of the dispensing device part, Fig. 7 is a side view of the same, and Fig. 8 is a plan view of the same. , FIG. 9 is a rear view of the floating base part, FIG. 10 is a side view of the same, FIG. 11 is a partially cutaway plan view taken along arrow A-A in FIG. 9, and FIG. 12 is a view taken along arrow B-8 in FIG. This is a perspective view. DESCRIPTION OF SYMBOLS 1... Body, 2... Cabin, 3... Chassis, 4... Bolt, 7... Nut, 10... Body conveyance device, 20... Positioning device, 40... Lifting Device, 60... Lock device, 80... Nut runner, 83... Frame, 85... Base plate, 88...
... Moving object, 90 ... Air motor, 91 ... Motor shaft, 92 ... Relay shaft, 96 ... Socket, 91 ...
・Spring, 99...Socket part, 10G...Washer receiver, 101...Torque sensor, 102...Runner axis, 103...Extrusion rod, 106...Ring, 107...Press Plate, 109... Actuation device, 110
...Dispensing device, 111...Chute, 112...
・Air nozzle. Agent Yoshihiro Morimoto Figure 7 Figure 1f Figure 1Q Figure f2

Claims (1)

[Claims] 1. A movable body that can move toward and away from the fastened nut is provided, a motor is provided on this movable body, and a cylindrical socket that is interlocked with the motor shaft is provided on the runner axis, and the socket is connected to the nut. has a socket part at the free end that can be fitted externally into the runner, and has an extrusion rod inside that is slidable on the axis of the runner, and a ring that is movable integrally with the extrusion rod is externally fitted into the socket; A nut runner characterized in that an actuating device for moving the ring relative to the socket is provided on the movable body side.