JPH0734797A - Nut runner for screw-setting machine - Google Patents

Abstract

PURPOSE:To downsize a nut runner by advancing a driving device in a small quantity. CONSTITUTION:A nut socket 6 is rotatably located at the top end part of a working arm 5 through a rotary shaft 9, and a feed driving motor 8 located on the base side of the working arm 5 and the rotary shaft 9 are connected movably together, through a power-transmitting mechanism 7 by wrapping. A tightening lever 11 rotatable within a definite range and a ratchet gear 10a are provided on the rotary shaft 9. At the base end part of the tightening lever 11, a ratchet pawl 10c is provided, which is engaged with the ratchet gear 10a only when the tightening lever 11 is turned in the direction of tightening. At the top end side of the tightening lever 11, a tightening cylinder device 22 for turning the tightening lever 11 is provided. A nut feed drive in low torque is done by the feed driving motor 8 and a nut-tightening drive in high torque is done by the tightening cylinder device 22 through the tightening lever 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut runner of a bolt / nut fastening machine used for fastening segments during tunnel excavation by a shield method, for example.

[0002]

2. Description of the Related Art Conventionally, for example, a bolt / nut fastening machine attached to a segment assembly device (erector device) is
A nut runner and a bolt chucker are provided on the fastening machine body. This nut runner is a tightening motor installed at the base end of the nut working arm, in which a nut socket with a removable nut is rotatably arranged at the tip of the working arm that can be inserted into the nut mounting hole of the segment. In addition, the nut socket is rotationally driven via a plurality of intermediate gears.

[0003]

However, according to the above-mentioned conventional structure, since about five intermediate gears are interposed to drive the nut socket, there is a large loss in torque transmission, and a high torque is required at the final tightening. Therefore, a large capacity fastening motor is provided. Therefore, there is a problem that the entire fastening device including the nut runner becomes heavy and is disadvantageous in handling and automation.

By the way, a "hydraulic torque wrench" which is a combination of a hydraulic cylinder, a rotating lever and a ratchet mechanism is known as a tightening device for bolts and nuts which is small in size and can obtain high torque. Since it rotates, the rotation speed of the nut socket is slow and it is not suitable for assembling a segment in which the nut feed amount is large.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a nut runner for a bolt / nut fastening machine which can use a driving device having a small output and a small capacity and can be miniaturized as a whole. To do.

[0006]

In order to solve the above problems, in the nut runner of the bolt / nut fastening machine of the present invention, a nut socket is rotatably arranged at the tip of a working arm arranged in the body of the fastening machine. In addition, the feed rotation drive device is arranged on the base end side of the work arm, and the rotation transmission mechanism is interposed between the rotation shaft of the nut socket and the output shaft of the feed rotation drive device. On the rotation axis,
A tightening lever that is rotatable within a predetermined range via a ratchet mechanism that engages only when rotating in the tightening direction is provided, and the tightening lever is rotated on the free end side for tightening. A drive device is provided.

[0007]

In the above structure, when tightening the nut,
After the nut attached to the nut socket is opposed to the bolt, the feed rotation drive device is rotated to drive the nut socket to rotate via the rotation transmission mechanism, and the nut is attached to the bolt and screwed into the lead. Then, when the nut is fed a predetermined distance and a torque greater than a predetermined value is required to drive the nut, the feed rotation drive device is stopped, and then the tightening drive device is driven to reciprocally rotate the tightening lever. By doing so, the rotating shaft is rotated via the ratchet mechanism only when the tightening direction is rotated, and the nut is tightened with a large torque via the rotating shaft.

As a result, at the time of mounting a nut that can be rotated with a small torque and driving to feed the lead, it is possible to mount and feed the nut at high speed and in a short time by using the rotary driving device for feeding drive. For tightening driving of a nut that requires a large torque, the nut drive can rotate the nut socket with a large torque through the tightening lever by the tightening drive device. Therefore, it is possible to configure the feed rotation drive device with a small capacity, and the tightening drive device that uses the tightening lever also requires a small output,
The overall weight can be significantly reduced, which is advantageous in handling and automation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a nut runner of a bolt / nut fastening machine according to the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a nut runner arranged on a fastener main body 2 so as to be able to move closer to and away from a bolt chucker (not shown) side. The nut runner 1 is guided by a guide rail 3 and slidably movable. A frame 4, a working arm 5 projecting from the movable frame 4, a nut socket 6 rotatably supported at the tip of the working arm 5 via a rotary shaft 9, and a movable end of the working arm 5 A feed drive motor (feed rotation drive device) 8 that is arranged on the frame 4 and wraps around the nut socket 6 to rotate and drive via a power transmission mechanism (rotation transmission mechanism) 7, and a ratchet on the rotation shaft 9 of the nut socket 6. A tightening lever 11 provided via the mechanism 10 and a tightening lever 11 provided on the base end side movable frame 4 of the working arm 5 for rotating the tightening lever 11 within a predetermined range. Cylinder device (for tightening drive)
It is composed of 12 and.

A pair of left and right guide rails 3 are laid on the fastener main body 2, and the guided members 2 are attached to these guide rails 3.
The movable frame 4 is slidably disposed via the first frame 1. The piston rod of the frame moving cylinder device 22 provided in the fastener main body 2 is connected to the movable frame 4, and the nut socket 6 can be moved in accordance with the mounting movement of the nut N.

The working arm 5 comprises a pair of front and rear arm plates 5a which are parallel to each other and whose front ends are connected by a connecting plate 5b. A shaft hole 5c formed in the front end of the arm plate 5a
A rotating shaft 9 to which the nut socket 6 is fixed is rotatably supported.

A winding power transmission mechanism 7 for driving the nut socket 6 includes a passive sprocket 7a attached to the opposite side of the nut socket 6 of the rotary shaft 9 and an output shaft of a feed drive motor 8 with a reduction gear. It is composed of a drive sprocket 7b attached and a chain 7c wound between the passive sprocket 7a and the drive sprocket 7b.

A ratchet gear 10a is formed in the center of the rotary shaft 9, and a pair of front and rear lever plates 11a forming a tightening lever 11 are rotatably fitted through the holes. Then, two ratchet pawls 10c are attached between the lever plates 11a through the support pins 10b, and the tightening lever 11 is tightened only in the tightening direction of the nut N.
A ratchet mechanism 10 that transmits the rotation of the to the rotation shaft 9 is configured.

The tightening cylinder device 12 includes a cylinder mounting member 11b provided at the free end of the tightening lever 11.
The cylinder body 12a is rotatably supported by the support pin 23, and the tip end of the piston rod 2b is pin-connected to the connecting bracket 24 of the movable frame 4. By expanding and contracting the tightening cylinder device 12, The tightening lever 11 can be reciprocally rotated within the range of α degrees.

The mounting work of the nut N in the above configuration will be described. After inserting the tip end of the work arm 5 into the nut mounting hole H of the segment S and making the nut N mounted on the nut socket 6 face the bolt B, the feed rotary drive motor 8 is rotated to wind the transmission mechanism 7. The nut socket 6 is rotationally driven through the nut N to attach the nut N to the bolt, and the lead of the bolt B is screwed. As the nut N moves, the frame moving cylinder device 22 contracts, the movable frame 4 moves, and the nut socket 6 follows. Then, when the nut N is fed by a predetermined distance and a torque of a predetermined value or more is required to rotate the nut N, the feed rotation drive motor 8 is stopped. Next, the tightening cylinder device 12
The ratchet pawl 1 can be moved only in the tightening direction by reciprocally rotating the tightening lever 11 by expanding and contracting.
1c is engaged with the ratchet gear 11a to rotate the rotating shaft 9, and the nut socket 6 is rotated to tighten the nut with a large torque.

According to the above-described embodiment, it is possible to perform the mounting movement of the nut N for the screw lead corresponding to the low torque by the rotary drive motor 8 for feeding at a high speed. Further, when necessary, for example, when the screw engagement is tight, or when the final tightening is performed, the tightening by the tightening cylinder device 12 can be performed with a high torque, and the working time can be shortened. Further, co-rotation of the rotary shaft 9 and the tightening lever 11 can be prevented by the stop torque of the feed rotary drive motor 8. Further, since the outputs of the feed rotary drive motor 8 and the tightening cylinder device 12 can be reduced, the weight is reduced by about 60% as compared with the conventional example in which a high torque is obtained by the rotary drive motor. It is possible to realize downsizing and easily improve the handling surface and promote automation.

According to the above-described embodiment, the ratchet gear 10a is provided on the rotary shaft 9 side and the ratchet pawl 10c is provided on the tightening lever 11 side. Conversely, the ratchet pawl 10c is provided on the rotary shaft 9 side. The ratchet gear 10a may be provided on the tightening lever 11 side.

[0019]

As described above, according to the present invention, in order to rotationally drive the nut socket, the feed rotary drive device for transmitting the rotational force through the rotary transmission mechanism, the tightening lever and the ratchet are provided. Since it is also used with a tightening drive device that transmits rotational force via a nut, when mounting a nut with a small torque and feeding drive, use the feed drive device to rotate the nut socket at high speed and quickly Can be mounted and fed, and the tightening drive of the nut that requires a large torque can be performed by rotating the nut socket via the tightening lever by the tightening drive device and tightening the nut with a large rotational force. . Therefore, the rotation drive device for feed can be configured with a small capacity, and since the tightening lever is used, a large driving force is not required for the tightening drive device, and the overall weight can be significantly reduced. This makes it easier to handle and automate the bolt / nut fastening machine.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a nut runner according to the present invention.

FIG. 2 is a front sectional view of the nut runner.

[Explanation of symbols]

 1 Nut runner 4 Movable frame 5 Working arm 6 Nut socket 7 Winding power transmission mechanism 8 Feed drive motor 9 Rotating shaft 10 Ratchet mechanism 10a Ratchet gear 10c Ratchet claw 11 Tightening lever 12 Cylinder device for tightening

Claims (1)

[Claims] 1. A nut socket is rotatably arranged at a tip end portion of a working arm disposed in a fastener machine main body, and a feed rotary drive device is arranged at a base end side of the working arm, and a rotation shaft of the nut socket. A rotation transmission mechanism is interposed between the rotation shaft and the output shaft of the feed rotation drive device, and the rotation shaft of the nut socket is rotatable within a predetermined range through a ratchet mechanism that engages only when rotating in the tightening direction. Bolts characterized in that a tightening lever is provided, and a tightening drive device for rotating the tightening lever is provided on the free end side of the tightening lever.
Nut runner for nut fastening machines.