JPH0418756Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a bolt tightening tool with a holding mechanism.

[Prior Art] Conventionally, when assembling, for example, a rear suspension arm of an automobile to a body, a bolt with a washer that covers the outer periphery of the side surface of the bolt head is used. It is physically impossible to hold the head of this bolt with a washer using the holding mechanism of a conventional tightening tool. Note that the bolt holding mechanism in conventional bolt tightening tools is disclosed in Japanese Utility Model Application No. 192719/1983 and Japanese Utility Model Application No. 1983/1983 filed by the present applicant.
There is No. 42579.

[Problems to be Solved by the Invention] The object of this invention is to provide a bolt tightening tool with a holding mechanism that can hold the shaft of a washered bolt and tighten it reliably and easily.

[Means for Solving the Problems] A bolt tightening tool according to the present invention that solves the above problems includes a nut runner having a drive shaft for bolt tightening, and a bolt rotation tool attached to the drive shaft. a socket; a bolt shank holding mechanism for holding the bolt shank when the bolt head is inserted into the socket; and a bolt shank holding mechanism attached to the bolt shank holding mechanism to hold the bolt shank. and a drive mechanism attached to the nut runner to move the bolt shank holding mechanism and the bolt support mechanism forward and backward relative to the bolt shank holding position. There is.

[Function] In the above configuration, before the washered bolt is set in the socket, the nut runner is stopped and the bolt shaft holding mechanism is advanced to the position where the bolt shaft is held by the drive mechanism, but the nut runner is not yet set in the socket. The bolt shaft is not held. Further, the bolt support mechanism is positioned to support the bolt shaft portion from below when the bolt head is inserted into the socket. In this state, the bolt head of the washered bolt is inserted into the socket, the bolt shaft is supported by the bolt support mechanism, and then the shaft is held by the bolt shaft holding mechanism. Next, move the nut runner and insert part of the tip of the washered bolt into the hole in the workpiece. Next, the shaft is released from being held by the bolt shaft holding mechanism, and the drive mechanism moves the bolt shaft holding mechanism together with the bolt support mechanism to a position where bolt tightening work is not hindered, and then the nut runner is rotated and moved forward. and fasten the workpiece to the vehicle body using bolts with washers.
When the tightening is completed, the nut runner returns to its original position, and the bolt shank holding mechanism is returned to the position where it holds the bolt shank by the drive mechanism.

[Example] This invention will be explained below with reference to drawings showing examples. In FIGS. 1 and 5, a washered bolt 3 which is a fastening part has a washer 1 inserted into the bolt 2, and in this state, a socket 6 is attached to a drive shaft 5 of a nut runner 4 which is a tightening tool.
The bolt head 2a is fitted into the bolt head 2a.

The bolts 8 are attached to the vertically split type brackets 7a and 7b on the main body cylindrical portion 4a of the nut runner 4.
An actuator 9 such as an air cylinder is attached to the bracket 7b. A nut 1 is attached to one end of the rod 10 of the actuator 9.
3, a bracket 11 is attached, and a mechanical hand 12 for holding the bolt shaft portion 2b is fixed to the bracket 11. An attachment 14 is attached to the mechanical hand 12 to support the bolt shaft portion 2b from below. Note that the bracket 26 is attached to the automobile body 25 as a workpiece for attaching the washered bolt 3.
Consider the case where part 27 is attached to.

Next, the structure of the mechanical hand 12 that holds the bolt shaft will be explained with reference to FIGS. 2 to 4.
The mechanical hand 12 has a cylinder 15 provided with ports 28 and 29, and a bracket 21 provided on the top surface of the cylinder 15. A piston 16 is inserted into the cylinder 15, one end of a piston rod 17 is fixed to the piston 16, and a pin 20 is fixed to the other end. The pin 20 of the piston rod 17 is attached to the pin 22 of the bracket 21.
The hand arms 18 are slidably movable in slits 19 provided in the horizontal pieces 18a of a pair of L-shaped hand arms 18 which are rotatably supported by the hand arms 18. Upright pieces 18b, 1 of hand arms 18, 18
Attachments 23, 23 for holding the bolt shaft portion 2b are attached to the inside of the bolt 8b.

In the above structure, before the washered bolt 3 is set in the socket 6, the nut runner 4 is stopped and the rod 10 of the actuator 9 supporting the mechanical hand 12 is at its extended end. On the other hand, in the mechanical hand 12, the piston 16 is in a position pushed up from the position shown in FIG. 2 by compressed air sent from the port 29, and the hand arm 18 is in an open state as shown by the dotted line. Also, the attachment 14 connects the bolt head 2a of the washered bolt 3 to the socket 6.
It is in a position that supports the bolt shaft portion 2b almost horizontally from below when inserted into the hole. Further, when the bolt head 2a of the washered bolt 3 is inserted into the socket 6 and the shaft portion 2b of the bolt 3 is supported by the attachment 14, the attachment 23 of the hand arm 18 of the mechanical hand 12 is in a position opposite to the bolt shaft portion 2b. be.

In this state, the bolt head 2a of the washered bolt 3
is inserted into the socket 6 and the bolt shaft portion 2b is placed on the attachment 14. Next, compressed air is sent to port 28 of mechanical hand 12 and port 29
When the hand arm 18 is released and the piston rod 17 is lowered together with the piston 16, the hand arm 18 closes and holds the bolt shaft portion 2b. Next is Nattu Runner 4
Move the base (not shown) that fixes the washer, bring the tip of the washered bolt 3 close to the hole 27a of the part 27, and insert the bolt 3 into the hole 27a to the part A shown in FIG. Compressed air is sent in to open the port 28, the piston 16 and the piston rod 17 are raised, and the hand arm 18 is opened. Next, the rod 10 of the actuator 9 is lowered to move the mechanical hand 12 and the attachment 14 out of the interference range between the operating range associated with insertion and tightening of the washered bolt 3 and the component 27. Next, while rotating the drive shaft 5 of the nut runner 4, the base (not shown) is moved, and the washered bolt 3 is inserted into the hole 27a of the component 27, while the component 27 is fastened to the bracket 26. When the fastening is completed, the nut runner 4 is returned to its original position and the rod 10 of the actuator 9 is extended to its extended end.

In the above embodiment, the attachment 14 constitutes a bolt support mechanism, and the mechanical hand 12 constitutes a bolt shaft holding mechanism. The bolt support mechanism and the bolt shaft holding mechanism are moved forward and backward with respect to the bolt shaft holding position shown in FIG. 1 by an actuator 9 constituting a drive mechanism.

[Effects of the invention] Since this invention has the above configuration, it has the following effects.

(a) Since the bolt shaft is held by the bolt holding mechanism, it can be used for long bolts with washers from small diameters to large diameters.

(b) If a clearance is provided between the socket and the bolt head, even if there is a misalignment when inserting the bolt into the workpiece, it can be corrected by adjusting the holding force of the bolt holding mechanism and the supporting force of the support mechanism. It is possible to have a compliance function that allows for compliance.

(c) Since the bolt can be supplied by inserting the bolt head into the socket and supporting the bolt shaft by the support mechanism, the operator does not have to hold the bolt until the bolt holding mechanism holds the bolt. Therefore, work safety can be ensured. Furthermore, when the bolts are supplied by an automatic machine such as a robot, it is possible to provide the support mechanism with a limit switch or the like to confirm that the bolts are supported by the support mechanism, thereby reducing the waiting time for holding the bolts. At the same time, there is no need to exchange signals with automatic machines.

[Brief explanation of the drawing]

FIG. 1 shows a front view of an embodiment of this invention.
FIG. 2 shows a sectional view taken along the line B--B in FIG. 1. FIG. 3 shows a sectional view taken along the line C--C in FIG. 2. Figure 4 is the first
A sectional view taken along the line DD in the figure is shown. Figure 5 is A of Figure 1.
-A cross-sectional view is shown. 2a...Bolt head, 2b...Bolt shaft, 3...
...Bolt with washer, 4...Nut runner, 5
... Drive shaft, 6 ... Socket, 9 ... Actuator (drive mechanism), 12 ... Mechanical hand (bolt shaft gripping mechanism), 14 ... Attachment (bolt support mechanism).

Claims (1)

[Scope of utility model registration request] a nut runner having a drive shaft for bolt tightening; a socket for rotating the bolt attached to the drive shaft; a bolt shaft holding mechanism for holding the bolt shaft in a state where the bolt head is inserted into the socket; a bolt support mechanism that is attached to the bolt shank holding mechanism and supports the shank until the bolt shank is held by the bolt shank holding mechanism; and a bolt support mechanism that is attached to the nut runner and supports the bolt shank until the bolt shank is held by the bolt shank holding mechanism; and a drive mechanism for moving the bolt support mechanism forward and backward relative to the bolt shaft holding position.