JPS643614B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tightening tool positioning device for a screw tightening device that can accurately and quickly position a tightening tool such as a nut runner with respect to a member to be tightened.

BACKGROUND ART Conventionally, positioning devices have been known that perform positioning by moving a tightening tool movably supported by a device frame to a position corresponding to a tightening location of a member to be tightened.

For example, the positioning device shown in FIG. 11 has a piston rod 52 of a cylinder 51 that is movable along the axial direction and is provided with a tightening tool (not shown) at the tip, and a brake member 53 is provided around the rod 52. The movement of the rod 52 in the axial direction is detected by a rod position detection device (not shown), the rod 52 is held by the brake member 53, and the tip of the rod 52 is tightened using the friction between the two members. The tool is stopped at a predetermined position.

However, with the above structure, it is necessary to have a drive section 54 for actuating the brake member 53 and a rod drive section 55 in the cylinder, and also a rod position detection device, so the structure is very complicated. In addition to being expensive and expensive, there were also problems in that it lacked durability because it used friction.

Further, the positioning device shown in FIG.
A piston rod 58 of this cylinder 57 is provided.
The tightening tools 56, 56 are connected to one end, and the other end is provided with a positioning plate 60 that moves between a pair of stoppers 59, and the rod 58 is connected until the positioning plate 60 abuts one of the stoppers 59. is moved to position the tightening tools 56, 56 at predetermined positions.

However, since the tightening tool is positioned by the positioning plate 60 of the rod 58 coming into contact with one of the stoppers 59, there is a major problem in that the tightening tool can only be positioned in two positions.

Purpose of the Invention The purpose of the present invention is to solve the above-mentioned problems by providing a fastening method that has a simple structure, is inexpensive, has excellent durability, and can be positioned reliably and quickly in a large number of locations. An object of the present invention is to provide a tool positioning device.

Structure of the Invention The present invention provides a screw tightening device frame with a plurality of tightening tools around the center axis of the screw tightening device, and drives all or some of the tightening tools (plurality) in a direction perpendicular to the tool axis. This is applied to a screw tightening device that is adapted to move parallel to the screw tightening device, and in order to achieve the above object, it is installed at a predetermined position of the tightening tool and is moved in a direction perpendicular to the tool axis and of the screw tightening device. a positioning protruding member protruding toward a central axis; a plurality of cylinders connected in series along the central axis to a central axis of the screw tightening device of the tightening tool; A plurality of positioning abutment surfaces are provided at the tip of the piston rod of the cylinder located at one end, and have a protruding amount that varies depending on the stroke of the cylinder along the axial direction of the cylinder, and that position the tightening tool by contacting the protruding member. The screw tightening device is composed of a positioning member shaped like a stack of stepped plate materials, and the tool provided around the central axis of the screw tightening device is moved by the drive device to release the contact between the protruding member and the positioning member, and then a predetermined position is set. The cylinder is driven, the positioning member is moved along the cylinder axis direction, and the protruding member of the tool is brought into contact with the abutment surface of the positioning member by the driving device, thereby positioning the tool at a predetermined position.

Embodiments The present invention will be specifically described below based on embodiments shown in FIG. 3 and subsequent figures.

First, a first embodiment of the present invention shown in FIGS. 3 and 4 will be described.

In Figures 3 and 4, 1 is a tightening tool such as a nut runner, 2 is a drive cylinder that moves the tightening tool 1 along the direction perpendicular to the tool axis, 3 is a positioning protrusion member provided on the tool 1, 4, 5 are the first and second
Cylinder 6 is a positioning member, which is provided in the screw tightening device frame 7, and when the driving cylinder 2 is driven, the tightening tool 1 is moved in a direction perpendicular to the tool axis, and the positioning protruding member 3 is positioned. The tightening tool 1 is positioned at a predetermined position in cooperation with the member 6, and the tightening tool 1 performs a tightening operation on the member to be tightened.

The tightening tool 1 is attached to the elongated hole 7 of the frame 7.
a, 7b so as to be movable in the direction orthogonal to the axis. A socket 10 is provided at the tip of this tool 1, and a nut or bolt is rotated and tightened.

Near the elongated hole 7a at the tip of the frame 7 (lower side in FIG. 3), the drive cylinder 2 is provided via an L-shaped stay 14 along a direction perpendicular to the tool axis.
The tip of the piston rod of the drive cylinder 2 is connected to the tip of the tool via a bracket 9, and the drive of the drive cylinder 2 moves the tool 1 in a direction perpendicular to its axis.

Further, the positioning protruding member 3 is fitted into a portion of the tool 1 closer to the tip than the bracket 9, and has a protruding portion 3a protruding in a direction perpendicular to the tool axis. Both side edges of the protruding member 3 are sandwiched between the frame 7 and the frame 7 by guide members 8, 8 provided at the leading end of the frame, so as to guide the movement of the protruding member 3 along the frame 7.

On the other hand, the first and second cylinders 4 and 5 are connected to the frame 7 in series along the tool movement plane and are connected to the tool 1.
is set up in parallel. That is, the rear end of the cylinder case 4a of the first cylinder 4 is fixed to the rear end side frame 7 via the bracket 12, and
The tip of the piston rod 4b of the first cylinder 4 is connected to the rear end of the cylinder case 5a of the second cylinder 5 via a connector 11. Each cylinder 4, 5
The piston rods 4b and 5b are positioned at either the maximum retracted position or the maximum extended position relative to the cylinder cases 4a and 5a, respectively.

The above-mentioned positioning member 6 is provided at the tip of the rod of the first cylinder 4. This member 6 has a shape in which a total of three rectangular parallelepipeds, large, medium and small, are stacked toward the tip, and has a positioning stepped portion that protrudes differently for each stroke dimension of the cylinders 4 and 5 along the direction orthogonal to the cylinder axis. 6a, 6b, and 6c, and the protruding portion 3a of the protruding member 3 is brought into selective contact with each step. The distal end of the positioning member 6 is fitted into an elongated hole 7c provided in the distal end frame 7, and a guide 13 guides movement along the cylinder axis. Therefore, the first and second
When both the cylinders 4 and 5 have the rod in its most retracted position, the stepped portion 6a comes into contact with the protruding member 3, and when the first cylinder 4 is driven to position the rod 4b in its most retracted position, the stepped portion 6a comes into contact with the protruding member 3. 6b comes into contact with the protruding member 3, and when the second cylinder 5 is further driven to position the rod 5b at the most extended position, the stepped portion 6c comes into contact with the protruding member 3.

The tightening tool positioning device having the above configuration operates as follows.

First, the tool 1 is moved in a direction away from the first and second cylinders 4 and 5 by the driving cylinder 2, and the protruding member 3 is separated from the stepped portion of the positioning member 6. Next, the first or second cylinder 4,
5 or both cylinders 4 and 5 are driven to move the positioning member 6 forward and backward along the cylinder axis direction, and position the positioning member 6 so that a predetermined step portion comes into contact with the protruding member. Then, the drive cylinder 2 is driven to move the tool 1 toward the first and second cylinders, and the protruding member 3 is brought into contact with the stepped portion of the positioning member 6, thereby positioning the tool 1 at a desired position.

Note that the present invention is not limited to this embodiment, and can be implemented in various other ways. For example, the step portion of the positioning member may be a curved surface, or the end surface of the protruding portion of the protruding member may be a curved portion.

Next, a second embodiment of the present invention shown in FIGS. 5 to 7 will be described. This embodiment is roughly configured by arranging the positioning device of the first embodiment in a cylindrical device frame 32 around the central axis 35 of the tightening device, and all or some of the tools can be positioned in one positioning operation. Positioning can be performed at one time.

As shown in FIGS. 5 and 6, 1a to 1f are tightening tools provided on the circumference around the central axis 35 of the device;
30 is a drive cylinder that moves two adjacent tools (for example, 1a, 1b) at once in a direction perpendicular to the center axis of the device, and 30 is fitted to the tip of each of the tools 1 and is located in a direction perpendicular to the tool axis and on the side of the center axis of the device. 4 and 5 are first and second cylinders 31 provided in parallel with the tool 1 and connected in series along the center axis of the device; 33 is a positioning member provided at the tip of the piston rod 5b of the second cylinder 5 and has a shape in which three hexagonal plates of large, medium and small are laminated toward the tip; 33 is fixed to the tip of the piston rod of the drive cylinder 2 and has recesses on both sides. Tool moving brackets 33a and 33a each have tips of tools (for example, 1a and 1b) slidably and loosely fitted therein, and 8 is a tool moving bracket such that both side edges of the protruding member 30 are sandwiched between the frame 32 and the frame 32. It is a guide member provided on the tip side frame 32 and guides each tool 1 to move along the direction perpendicular to the center axis of the device.It drives the drive cylinder 2 and moves the two tools simultaneously between the bracket 33 and the guide member 8. The guide moves it forward and backward along the radial direction.

The positioning member 31 positions each surface of each hexagonal plate material with positioning stop surfaces 31a, ...; 31b,
... ; 31c, ..., and the amount of protrusion varies depending on the stroke of the cylinders 4 and 5 along the cylinder axis direction, and the protrusion amount is different for each stroke of the cylinders 4 and 5, and the protrusion amount is different for each stroke of the cylinders 4 and 5. The protruding portion 30a of the protruding member 30 of each tool 1 is selectively abutted. The distal end of the positioning member 31 is fitted into an elongated hole 32c in the distal frame 32, and is guided along the cylinder axis by a guide 34 provided on the frame 32.

The positioning device having the above structure is operated as follows. The following operations are performed on all drive cylinders 2,
2 and 2, all the tools 1 can be positioned at once, and if it is performed for some of the drive cylinders 2, some of the tools 1 can be positioned. That is, first, the desired tools 1a, 1b are moved to the drive cylinder 2.
to move the device outward in a direction perpendicular to the central axis of the device. At this time, the bracket 3 connected to the drive cylinder 2
3 moves outward in a direction orthogonal to the center axis of the device along the axial direction of the drive cylinder, while the protruding members 3 of each tool 1
0 is guided by the guide member 8 to the drive cylinder 2.
Since the tool 1 is moved outward in a direction orthogonal to the center axis of the device, which is different from the axial direction of the tool 1, the tool 1 slides from the recess 33a of the bracket 33 in the removal direction. In this state, similarly to the embodiment described above, a desired cylinder is driven to move the abutting surface of the positioning member 31 along the cylinder axis direction, and the predetermined abutting surface is moved to the protruding member 31.
position so that the protrusion 30a of 0 is pressed against the protrusion 30a. Thereafter, the drive cylinder 2 is driven to move the tool 1 toward the center in a direction perpendicular to the central axis of the apparatus.
At this time, the bracket 33 is moved by the drive cylinder 2 along its axial direction and toward the center axis of the device, and the tools 1a and 1b in both recesses 33a and 33a of the bracket 33 are moved along the axial direction of the drive cylinder 2. However, the protruding member 30 of each tool 1
is guided by the guide member 8 toward the center axis in the direction perpendicular to the center axis of the apparatus, so that each tool 1 slides toward the bottom within the bracket recess 33a.
Each tool 1 is moved toward the center in the direction perpendicular to the center axis of the device. Then, the protruding portion 30a of the protruding member 30 of each tool 1 is abutted against a predetermined abutment surface of the positioning member 31, and the tool 1 is positioned.

According to the above embodiment, all the tools can be positioned in one operation, and it is particularly suitable for tightening work in which the members to be tightened are arranged on different circumferences, such as large and small wheels. It is.

Note that the second embodiment is not limited to this, and can be implemented in various other ways. For example, the tool may be rotated not only in a direction perpendicular to the center axis of the device, moving toward and away from the center axis, but also around the center axis. Further, the positioning member is not limited to a polygonal plate material, but may be a curved surface as long as it can hold the protrusion of the protrusion member.

Effects of the Invention As described in detail in the above embodiments, the present invention provides a positioning protruding member at a predetermined position of each tightening tool in a direction perpendicular to the tool axis and protruding toward the center axis side of the screw tightening device. A plurality of cylinders are connected in series along the central axis of the screw tightening device of the tightening tool to the tightening device frame, and one positioning member is provided at the tip of the piston rod of the cylinder located at one end of the plurality of cylinders. The positioning member is made of laminated plate materials each having a plurality of stages of positioning abutting surfaces that protrude in different amounts for each stroke of the cylinder along the cylinder axis direction and that position the tightening tool by contacting the protruding member. The protruding member of the tightening tool is brought into contact with the predetermined abutting surface by driving an arbitrary cylinder by a stroke amount, and the driving of the driving cylinder causes the predetermined abutting surface and the protruding member to come into contact with each other. Since the tool is positioned at a predetermined position by making contact with the tool, all or a part of the plurality of tightening tools can be positioned reliably and easily with one positioning member. Can be done quickly. Further, since a single positioning member can sufficiently position a plurality of tools, the entire device is simple and inexpensive, and has good durability. Further, the tool can be positioned at different positions corresponding to the number of abutment surfaces of the positioning member. It can also be controlled remotely.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a conventional positioning device, FIG. 3 is a cross-sectional side view of the positioning device according to the first embodiment of the present invention, and FIG. 4 is a cross-sectional rear view taken along the line - 5 is a partially cross-sectional side view of a positioning device according to a second embodiment of the present invention, FIG. 6 is a cross-sectional rear view taken along the line - in FIG. 5, and FIG. 7 is a perspective view of the bracket 33 in FIG. 6. . 1... Tightening tool, 2... Drive cylinder, 3, 3
0...Positioning protrusion member, 4, 5...First, second
Cylinder, 6, 31... Positioning member, 6a, 6
b, 6c... step part, 31a, 31b, 31c...
Abutting surface, 7... Tightening device frame, 35...
Central axis of the tightening device.

Claims (1)

[Claims] 1. A plurality of tightening tools are provided in the screw tightening device frame around the center axis of the screw tightening device, and all or part of the tightening tools are moved in parallel in a direction orthogonal to the tool axis by a drive device. In the screw tightening device, the screw tightening device includes: a positioning protruding member provided at a predetermined position of the tightening tool and protruding in a direction perpendicular to the tool axis and toward the center axis of the screw tightening device; a plurality of cylinders connected in series along the central axis of the screw tightening device of the tightening tool;
a positioning pad that is provided at the tip of a piston rod of a cylinder located at one end of the plurality of cylinders, has a protruding amount that differs for each stroke of the cylinder along the axial direction of the cylinder, and that positions the tightening tool by contacting the protruding member; A tightening tool positioning device for a screw tightening device, comprising a positioning member shaped like a stack of plate materials each having a plurality of stages of stop surfaces. 2. The tightening tool positioning device for a screw tightening device according to claim 1, wherein the positioning member is shaped like a stack of polygonal plates having a plurality of stages of the positioning abutting surfaces.