JPH026997Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a bolt-nut tightening module with socket phasing.

(Prior Art) As this type of bolt/nut tightening module, there can be mentioned one having a structure already proposed by the applicant (for example, Utility Model Application No.
(See specification and drawings of No. 55205). This prior art includes a socket mechanism capable of gripping a bolt head or a nut, a compliance mechanism for dealing with misalignment between the bolt and the nut, a nut runner for tightening the bolt and nut, and the like.
Note that the supply of bolts or nuts to the socket mechanism is automatically performed by a robot or the like.

(Problems to be Solved by the Invention) In the bolt/nut tightening module, when the bolt or nut is supplied to the socket mechanism, the hexagonal surfaces of the head or nut of the automatically supplied bolt and the socket mechanism are misaligned. If so, it takes time to match them. This is because the azimuth angle of the socket mechanism varies after the bolt/nut is tightened.

(Means for Solving the Problems) The bolt/nut tightening module with socket phasing according to the present invention is characterized in that the socket can always be maintained at a predetermined azimuth after the bolt/nut is tightened.

Specifically, the nut runner is capable of being driven in forward and reverse directions, an inner cylinder that rotates about its axis in response to rotational force from the nut runner, and a nut runner that is connected to the end of the inner cylinder so that it can be expanded and closed. , a pair of sockets capable of gripping a bolt head or nut in a closed state, an elastic member that always biases these sockets in the direction of expansion, and movable in the axial direction with respect to the outer periphery of the inner cylinder. a socket clamp outer cylinder which is assembled to the socket clamp outer cylinder and which can restrain or release the socket in a closed state against the elasticity of the elastic member by this movement; an actuating mechanism that provides a moving force in the direction, a member that transmits rotational force from the nut runner to the socket, and a member that is in a fixed relationship thereto, and when the nut runner is reversed, The nut runner is also provided with a stopper mechanism that prevents rotation of the nut runner so as to stop the socket at a predetermined azimuth angle.

(Function) According to the above structure, the socket is restrained in the closed state, or this restraint is released, and the socket is in the expanded state by moving the socket clamp outer cylinder in its axial direction. For example, a bolt head is set in the expanded socket, and then the bolt head is gripped by closing the socket.
When the nut runner is rotated in the forward direction in this state,
The socket and bolt rotate together through the inner cylinder to tighten them.

When the nut runner is reversed after tightening is completed, the stopper mechanism prevents the nut runner from rotating when the socket reaches a predetermined azimuth. The hexagonal surface of the socket in this state and the hexagonal surface of the bolt head automatically supplied in the next cycle are in phase with each other.

(Description of Embodiments) This invention will be described below based on drawings showing embodiments. 1 to 5, a nut runner 1 is connected to a stay 2, and the stay 2 is connected to a plate 4 of a remote control center device (hereinafter referred to as an RCC device) R via a bracket 3.
is combined with The RCC device R is composed of two opposing plates 4 and 6 and a ring-shaped rubber mount 5 interposed between the plates 4 and 6. RCC device R is plate 4
The plate 6 is aligned with the rubber mount 5 with reference to . A bottom plate 7 of a socket mechanism S with a clamp is attached to the upper surface of the plate 6. The socket mechanism S includes a bottom plate 7 , an outer cylinder 8 attached to the upper surface of the bottom plate 7 , an inner cylinder 12 that is rotatably housed in the outer cylinder 8 around its axis, and a portion of which protrudes from the upper end of the outer cylinder 8 A protrusion 12a from the outer cylinder 8 of
The socket clamp outer cylinder 15 is loosely fitted into the socket clamp outer cylinder 15, and the pin 1 is attached to the upper end of the inner cylinder 12 inside the socket clamp outer cylinder 15.
Recess 1 for bolt clamp, pivoted by 6
It is composed of sockets 17 and 18 having 7a and 18a, and a spring 21 that urges the sockets 17 and 18 in the expanding direction. Nutto Runner 1
The tip 9 of is connected to one end of a universal joint 10.

Eccentric cam 10 for universal joint 10
A is attached to the eccentric cam 10a, and a stopper pin 26 is in contact with the eccentric cam 10a. Stoppin 26
is inserted into the bracket 3 via a bush 27 so as to be movable as a piston, and is constantly pressed against the eccentric cam 10a by a spring 28.
The reaction force of the spring 28 is received by a plate 29 attached to the bracket 3.

The other end of the universal joint 10 is supported by the plate 7 of the socket mechanism S via a thrust washer 11, and is screwed to the inner cylinder 12. A piston 13 is housed in the inner cylinder 12, and a pin 14 is inserted through the upper end of the piston 13.
The pin 14 slidably passes through axially opposing slits 12b provided in the upper part of the inner cylinder 12, and its both ends are connected to the socket clamp outer cylinder 15. Therefore, when the piston 13 moves vertically relative to the inner cylinder 12, the socket clamp outer cylinder 15 also moves vertically relative to the inner cylinder 12 via the pin 14. That is, the piston 13 functions as an operating mechanism for moving the socket clamp outer cylinder 15 in the axial direction. Further, when the nut runner 1 rotates, the inner cylinder 12 rotates relative to the outer cylinder 8 via the universal joint 10, and the piston 13 and the socket clamp outer cylinder 15 are connected via the pin 14.
rotates integrally with the inner cylinder 12. At the same time, eccentric cam 10
A also rotates, causing the stopper pin 26 to move as a piston. Further, when the nut runner 1 is rotated in the reverse direction, the eccentric cam 10a is also rotated in the reverse direction. When the eccentric cam 10a rotates in the opposite direction, the stopper pin 26 hits the locking portion 30 of the eccentric cam 10a, and the rotation of the eccentric cam 10a is stopped. Therefore, when the nut runner is reversely rotated after the bolt/nut is tightened, and the reverse rotation is stopped by the contact between the locking portion 30 of the eccentric cam 10a and the stopper pin 26, the hexagonal surfaces of the sockets 17 and 18 are always kept at a predetermined azimuth angle. Stop at the position. This allows the hexagonal surface of the socket and the hexagonal surface of the bolt nut to be aligned in phase.

The nut runner 1 is configured to stop the sockets 17 and 18 at a predetermined azimuth angle only when the nut runner 1 is reversed by the locking portion 30 of the eccentric cam 10a and the stopper pin 26.
A stopper mechanism is configured to prevent rotation of the rotor.

The stay 2 is connected to a tightening slide unit 19. The slide unit 19 moves up and down along the guide bar 22.
9 is connected to a positioning slide unit 20. The sliding unit 20 is the guide bar 2
3 in a direction perpendicular to the plane of the paper in FIG. The inner cylinder 12 and the outer cylinder 8 are provided with air holes 24 and 25 that communicate with the inside of the inner cylinder 12 on the rod side and head side of the piston 13.

In the above configuration, the air hole 24 on the rod side of the inner cylinder 12 is used to keep the sockets 17 and 18 open.
Air is introduced into the inner cylinder 12 and the piston 13 is moved downward. As a result, the socket clamp outer cylinder 15 also moves downward along the outer peripheral surface of the inner cylinder 12 via the pin 14. As the socket clamp outer cylinder 15 moves downward, the sockets 17 and 18 are expanded by the spring 21. Also socket 17,1
By rotating the nut runner 1 in the opposite direction and bringing the stopper pin 26 into contact with the locking portion 30 of the eccentric cam 10a, the hexagonal surfaces of the sockets 17 and 18 are aligned with the hexagonal surfaces of the bolts and nuts. It stops at the position where the phases of the two match. The recesses 17 of the sockets 17 and 18 in this stopped and expanded state
The head of bolt A is set at a, 18a.
At the same time as the bolt A is set, the supply of air from the air hole 24 is cut off, and air is supplied to the inner cylinder 12 from the air hole 25 on the head side. As a result, piston 13
moves upward, and the socket clamp outer cylinder 15 also moves upward via the pin 14. When the socket clamp outer cylinder 15 moves upward, it closes the sockets 17 and 18, which are expanded by the elasticity of the spring 21, against the elasticity of the spring, and clamps the head of the bolt A in the recesses 17a and 18a. When the bolt A is clamped, the positioning slide unit 20 moves in a direction perpendicular to the plane of the paper in FIG. 1 and is positioned at a predetermined position. Next, the tightening slide unit 19 rises as shown in FIG. 1, and at the same time the nut runner 1
rotates. As the nut runner 1 rotates, the bolt A rotates and advances through the universal joint 10, inner cylinder 12, pin 16, and sockets 17 and 18, and is pressed by the slide unit 19 against the nut B for tightening the object C. It will be done. At this time, there is a positional deviation D and an angular deviation E between the bolt A and the nut B. This deviation is bolt A
Threaded connection with nut B or bolt with guide
Centered by A′.

This centering is performed by displacing the rubber mount 5 of the RCC device R.
Due to the displacement of RCC device R, sockets 17,1
8 is concentric with the nut B via the bolt A, and the bolt A is fastened to the nut B via the object C to be fastened. When the fastening is completed, the rotation of the nut runner 1 is stopped and air from the air hole 25 is cut off.
When the air from the air hole 25 is cut, the air hole 2
Air is supplied from 4, and the piston 13 is connected to the pin 14.
The sockets 17 and 18 move downward together with the socket clamp outer cylinder 15 through the spring 21.
The bolts are expanded and the clamp on bolt A is released. At the same time as the bolt A is released from the clamp, the tightening slide unit 19 and the positioning slide unit 20 return to their original positions. Further, the nut runner 1 rotates in the opposite direction to stop the hexagonal surfaces of the sockets 17 and 18 at a predetermined azimuth position, so that they are in the same phase as the hexagonal surfaces of the bolt and nut.

Incidentally, in place of the locking part 30 of the eccentric cam 10a provided in the universal joint 10 in the above embodiment, a locking part is provided on the nut runner 1, and instead of the stopper pin 26, this locking part is used when the nut runner 1 rotates in reverse. The bracket 3 may be provided with a ratchet pawl that engages with the bracket 3.

(Effects of the invention) The present invention allows the hexagonal surface of the socket to always match the phase of the hexagonal surface of the bolt head or nut when the bolt head or nut is automatically supplied to the socket. It is carried out quickly, shortening the cycle time of the entire tightening operation and increasing work efficiency.

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal sectional front view of an embodiment of this invention. FIG. 2 shows an enlarged view of the main part of FIG. 1. The left side of the center line shows the socket clamped state, and the right side shows the socket unclamped state. FIG. 3 shows a state in which an object C is fastened using a guide bolt. FIG. 4 shows an enlarged view of the P line in FIG. FIG. 5 shows a sectional view taken along the line H--H in FIG. 1. 8...Outer cylinder, 12...Inner cylinder, 13...Piston, {12b...Slit, 14...Pin} The piston and socket clamp outer cylinder are rotated together with the inner cylinder, and the axial direction relative to the inner cylinder is rotated. A mechanism for integrally moving the socket clamp, 15... socket clamp outer cylinder, 1
7, 18...Socket, 21...Spring (elastic member), {26...Stopper pin, 28...Spring, 30...Locking part} Azimuth positioning mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] A nut runner that can be driven in forward and reverse directions, an inner cylinder that rotates around its axis in response to rotational force from the nut runner, and a pair of sockets that are coupled in a manner that they can be closed and that are capable of gripping a bolt head or nut in a closed state; an elastic member that always biases these sockets in a direction in which they are expanded; assembled so as to be movable in the axial direction, and this movement restrains the socket in a closed state against the elasticity of the elastic member;
Alternatively, a socket clamp outer cylinder whose restraint can be released, an actuating mechanism that applies a moving force to the socket clamp outer cylinder in the axial direction, a member that transmits rotational force from the nut runner to the socket, and and a stopper mechanism provided between the nut runner and a member in a fixed relationship to prevent rotation of the nut runner so as to stop the socket at a predetermined azimuth angle only when the nut runner is reversed. Bolt/nut tightening module with phase alignment.