JPH0621625Y2 - Elastic ring assembly device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an elastic ring assembling device, and more particularly to an assembling device for automatically assembling an elastic ring to a step or the like on the inner surface of a cylindrical assembly object. Pertain.

[Prior Art] An apparatus for automatically assembling an elastic ring such as an oil seal with a step or groove formed on the inner surface of a cylindrical assembly such as a circular pipe is disclosed in, for example, JP-A-59-24928. To O
A ring insertion device is disclosed. This device arranges a plurality of rotary fingers and lifting fingers that lock the inner diameter of the O-ring to be assembled around the central axis of the revolving structure, raises and lowers these fingers, and moves the lifting fingers relative to the rotating fingers. It is designed to be raised and lowered. According to the same publication, it is explained that this device can automatically perform the O-ring insertion work which has conventionally relied on manual labor.

Further, Japanese Patent Laid-Open No. 59-115135 discloses a device for assembling an elastic ring on the outer periphery of a cylindrical assembly body. This device is provided with a plurality of support claws and a plurality of links connected to these, so that the support claws can expand the elastic ring to loosely fit into the assembly body and to fit into the annular groove of the assembly body. It is described that it is possible to increase the opening amount of the supporting claw with a smaller number of supporting claws as compared with the conventional device.

[Problems to be Solved by the Invention] In the former device disclosed in Japanese Patent Laid-Open No. 59-24928, two rotary drive motors are required for rotating and revolving the rotary finger, and a rotary finger and a lifting finger are provided. The interlocking mechanism is complicated and inevitably large.
The latter device disclosed in Japanese Patent Laid-Open No. 59-115135 has an elastic ring attached to the outer periphery of the body to be assembled, and its main purpose is to increase the opening amount of the support claws. It cannot be used as it is for a device attached to the inner surface of the.

Further, in the above-mentioned conventional elastic ring assembling device, the O-ring or the elastic ring is supported from inside by a plurality of fingers or supporting claws, and in any device, at least three fingers or supporting fingers are supported. It is necessary to dispose the claws in a direction orthogonal to the ring surface and along the inner circumference of the ring with a gap. It is preferable for the device described in the former publication to allow the device to be configured with a small number of supporting claws as described in the latter publication, but the elastic ring is supported by expanding from the inside. As described in the former publication, at least three fingers are required for the assembly.

Therefore, an object of the present invention is to provide an elastic ring assembling apparatus which has a simple structure and is capable of automatically assembling the elastic ring on the inner surface of the body to be assembled by a simple operation.

[Means for Solving the Problems] In order to achieve the above object, the elastic ring assembling device of the present invention is fixed to a base that moves in a horizontal direction and a vertical direction and a support portion extending from the base. And a support body having one end connected to the rotation shaft of the rotation drive device and the other end swingably supported by the base, and at least a pair of the support body mounted on the support body to expand, contract, and close. A gripping device having gripping claws, which holds the elastic ring by deforming it into an elliptical shape at least from the outside by the gripping claw, and a pressing force movably supported in the direction of the assembly body to which the elastic ring is assembled. And a pressing device that presses and drives the pressing member by bringing it into contact with one end of the long axis portion of the elastic ring deformed into the elliptical shape.

[Operation] With the elastic ring assembling device configured as described above, for example, the annular elastic ring can be automatically assembled to the stepped portion formed on the inner surface of the cylindrical assembly object.

First, after moving the base so that the gripping device is located right above the elastic ring, the base is moved downward to lower the gripping device, and the elastic ring is gripped from the outside by the grip claws.
As a result, the elastic ring is deformed into an elliptical shape and held by the grip claws. In this state, the base is moved upward to raise the gripping device, then the base is horizontally moved and the gripping device is rotationally driven by the rotation driving device so that one end of the long axis portion of the elastic ring deformed into an elliptical shape is The gripping device is swung so as to be inclined with respect to the assembling surface of the body to be assembled, and the swinging is stopped when the gripping claw is positioned directly above the body to be assembled.

Next, the base is moved downward to lower the gripping device, and the lowering is stopped when one end of the major axis portion of the elastic ring deformed into an elliptical shape is positioned near the stepped portion on the inner surface of the assembly target. Then, the base is horizontally moved by a minute distance until one end of the long axis of the elastic ring comes into contact with the inner surface of the assembled body. Next, the pressing device is driven to move the pressing member in the direction of the assembly body, and presses the other end side of the long shaft portion of the elastic ring. As a result, both ends of the long axis of the elastic ring that has been deformed into an elliptical shape are positioned near the step of the assembly, and after the grip claws are released from the elastic ring, the base is moved upward and gripped. When the claw is retracted, the elastic ring returns to the original annular shape by its own elastic force and comes into close contact with the stepped portion on the inner surface of the body to be assembled.

[Embodiment] FIGS. 1 to 3 show an embodiment of the present invention, showing an elastic ring assembling apparatus for assembling a rubber annular elastic ring 1 on an inner surface of a cylindrical assembly 2 Is. In the present embodiment, the assembly 2 is a component in which the rod 2b is supported in the circular pipe 2a via the rod guide 2c, and the elastic ring 1 is fitted to the inner surface of the circular pipe 2a on the rod guide 2c. It is a thing.

The elastic ring assembling device of this embodiment is one in which the base 11 is mounted on the moving device 10 that moves in the horizontal direction and the vertical direction. As the moving device 10, for example, an orthogonal two-axis robot is used. A base 11 is configured by the parts. As shown in FIG. 2, the base 11 has an arm portion 11a which is substantially U-shaped in a plan view, and the rotary drive device 20 is fixed to the arm portion 11a. The rotary drive device 20 is composed of, for example, an air rotary actuator, and a rotary shaft 21 thereof extends in the direction of the base 11 as shown in FIG.

As is apparent from FIGS. 2 and 3, a support body 30 is arranged in the space portion of the substantially U-shaped arm portion 11a of the base 11, and a lifting drive device 40 is fixed thereto. The support 30 has a flat plate-shaped base 31, on which a shaft portion 30 a extending in the direction of the rotary drive device 20 and a shaft portion 30 extending in the direction of the base 11 are provided.
b is joined and supported so as to be rotatable around these shaft portions. The shaft portion 30a is connected to the arm portion 1 of the base 11 via a bearing.
The rotary shaft 21 is supported on the tip side of the la 1a, and the rotary shaft 21 is fitted and keyed into a hole formed in the axial direction. Shaft 30b
Is provided on the same axis as the shaft portion 30a, and the arm portion 1 of the base 11 is
The base 1a is supported via a bearing. Therefore, when the rotary drive device 20 operates and the rotary shaft 21 rotates, the shaft portion 3
0a rotates around the bearing together with the rotary shaft 21, and
Swings around the shaft portions 30a and 30b.

A hole is formed in the center of the base 31 of the support body 30, and the shaft 41 of the lifting drive device 40 fixedly mounted on the base 31.
Penetrates through the above holes and extends downward as shown in FIG. An air cylinder, for example, is used as the lifting drive device 40, and is configured so that the shaft 41 moves forward and backward by the compressed air, that is, moves up and down in FIG. A gripping device 50 is arranged on the extension of the shaft 41, that is, on the lower side in FIG. 3, and is connected to the base 31 via connecting members 32 and 33 as shown in FIG.

As shown in FIGS. 1 and 3, the gripping device 50 includes a support member 51 having a substantially U-shape in a front view, the base portion of which is connected to the connecting members 32 and 33, and bearing portions 51c and 51d provided on both legs thereof. A pair of grip claws 52 and 53 rotatably supported are provided. As shown in FIG. 3, the grip claws 52 and 53 are symmetrical and face each other with a distance smaller than the outer diameter of the elastic ring 1. As described above, since they have the same structure, the description will be made below centering on the side of the grip claw 53, whose cross section is shown. In the grip claw 53, the claw member 53a and the lever 53b are bolted to each other, and the substantially central portion of the lever 53b is the bearing portion 5 of the support member 51.
It is supported by d. A slit is formed at the tip of the lever 53b and bifurcates. A plate-shaped cam member 54 is interposed in this slit, and a roller 53r is rotatably provided at the tip of the lever 53b.

As shown in FIG. 3, the cam member 54 has a cam surface formed inside the member, and is bolted to the tip of the shaft 41. The cam surface is composed of an inclined portion that inclines from the outside to the inside with respect to the axial direction of the lifting drive device 40, that is, the extension axis direction of the shaft 41, and a linear portion that is parallel to the axial direction.
The lower end portion of the cam member 54 in FIG. 3 is configured to be fitted into a slit formed in the base portion of the support member 51 and guided by the slit. A compression spring 56 is interposed between the side surface of the lever 53b between the roller 53r mounting portion and the bearing portion 51d support portion and the side surface of the support member 51 base portion, and the grip claw 53 is counterclockwise in FIG. Biased in the direction. That is, the gripping claws 52 and 53, and the claw members 52a and 53a at the tip end are urged in the contracting and closing direction by the compression springs 55 and 56, and abut against the tip end part of the support member 51, and the roller 53r causes the cam 53 of the cam member 54 to move. It is in contact with the surface.

A concave portion that supports the elastic ring 1 is formed inside the tip portions of the claw members 52a and 53a, that is, on the side where the claw members 52a and 53a face each other. As shown by the chain double-dashed line in FIG. 3, the ring 1 is held between the claw members 52a and 53a and the tip of the support member 51 in a sandwiched manner. Therefore, the tip portion of the support member 51 has movable members such as the claw members 52a and 53a.
On the other hand, it functions as the fixed claw portions 51a and 52b. Then, when the shaft 41 moves backward by the action of the elevating / lowering device 40, that is, when the shaft 41 moves upward in FIG. 3, the roller 53r moves on the cam surface of the cam member 54 and the compression spring 56.
The lever 53b is rotated clockwise against the urging force of.
As a result, the claw member 53a moves in the expansion direction as shown by the chain double-dashed line in FIG. The grip claw 52 operates in the same manner, and the claw member 52a moves in the expanding direction. As shown in FIG. 1, a holding plate 57 is fixed to the connecting member 32 for preventing the elastic ring 1 from departing when assembled.

As shown in FIGS. 1 and 2, the arm 11 a of the base 11 is
The pressing device 60 is fixed to the bracket via a bracket 61. The pressing device 60 includes, for example, a driving portion 62 formed of an air cylinder, a guide rail 64 fixed to the bracket 61 in the vertical direction with respect to the base 11, and the guide rail 6
The pressing member 63 is a pressing member that is slidably supported on the drive unit 4 and is driven by the driving unit 62. As aforementioned,
The support pair 30 to which the grip device 50 is connected is swingably supported by the base 11, and is rotationally driven by the rotary drive device 20. Thus, the gripping device 50 is configured to be swingable to the position shown by the chain double-dashed line in FIG.
When the lower end of 0 is above the assembly 2, the elastic ring 1
Can be rotationally moved to just above the elastic ring 1 assembly portion of the assembly body 2.

The assembling operation of the elastic ring 1 by the elastic ring having the above configuration will be described.

First, in FIGS. 1 and 2, the base 11 of the moving device 10 is driven in the horizontal direction and the vertical direction, and the gripping device 50 is moved so as to be positioned immediately above the elastic ring 1 supply position (not shown). Let When the shaft 41 of the lifting drive device 40 is driven backward from that position and the cam member 54 of the gripping device 50 is driven upward, the gripping claws 52, 53 expand as described above. In this state, the base 11 is moved downward by a minute distance and stopped when the fixed claws 51a and 51b are located inside the elastic ring 1 and the claw members 52a and 53a are located outside. Here, when the lifting drive device 40 is driven to move the shaft 41 forward, the claw members 52a and 53a contract and close, and the elastic ring 1 is housed in the respective recesses from the outside, and the fixed claw parts 51a and 51b.
And the elastic ring 1 is held between them. At this time, since the distance between the claw members 52a and 53a is smaller than the outer diameter of the elastic ring 1, the elastic ring 1 is deformed into an elliptical shape as shown in FIG.

The elastic ring 1 is deformed into an elliptical shape and held by the gripping device 50 as described above.
Is moved to the upper side of the body 2 to be assembled. Here, by driving the rotation drive device 20, the support body 30 and the gripping device 50 connected thereto are swung, and one end of the major axis portion of the elastic ring 1 deformed into an elliptical shape is attached to the assembly body 2. The horizontal component that is inclined with respect to the attachment surface, that is, the surface of the rod guide 2c, and whose horizontal component is the circular pipe 2
The swinging is stopped at a position substantially matching the inner diameter of a. FIG. 5A shows this state, and the following operation will be described with reference to FIGS. 5B to 5E.

The base 11 is moved downward from the state of FIG. 5 (a), and one end of the long axis portion of the elastic ring 1 is positioned near the rod guide 2c of the assembly target 2 as shown in FIG. 5 (b). The gripping device 50 is lowered until it is done. In this state, the base 11 is horizontally moved, and the gripping device 50 is moved until one end of the long axis portion of the elastic ring 1 contacts the inner surface of the circular tube 2a as shown in FIG. 5 (c). Then, the pressing device 60 is driven to lower the pressing plate 63 as shown in FIG.
The other end of the long axis portion of is pressed. In this manner, the shaft 41 of the lifting drive device 40 is retracted while the elastic ring 1 is pressed by the presser 63, and the gripping claws 52 and 53 of the gripping device 50 are retracted.
To expand. As a result, the elastic ring 1 is disengaged and returns to its original annular shape due to its resilience, and is tightly fixed on the rod guide 2c on the inner surface of the circular tube 2a to be in the state of FIG. 5 (e). When the gripping device 50 is disengaged from the elastic ring 1, the pressing plate 57 prevents the elastic ring 1 from popping out.

As described above, according to the elastic ring assembling apparatus of the present embodiment, the elastic ring 1 can be easily assembled to the mounted body 2 as shown in FIG. Similarly, as shown in FIG.
6 (a) and 6 (b) corresponding to FIGS. 5 (c), 5 (d) and 5 (e), for the assembly body 2 of the circular pipe 2a having the annular groove 2d formed on the inner surface. The elastic ring 1 can be easily assembled according to the operations of (c) and (c).

In the above embodiment, the rotary drive device 20, the elevating drive device 40, and the pressing device 60 are all air cylinders that operate with compressed air. Instead of these, an electric actuator such as an electric motor is used. May be Further, in the above embodiment, the gripping device 50 is configured such that the gripping claws 52 and 53 are expanded and contracted by the drive of the elevating and lowering drive device 40, but other driving sources may be used, or the cam member 54. Alternatively, the grip claws 52 and 53 may be directly driven without the provision of. Further, the support member 5
1 is provided with fixed claw portions 51a and 51b, and grip claws 52 and 53 are provided.
Although the elastic ring 1 is held together with the claw members 52a and 53a of the above, the fixed claw portions 51a and 51b are eliminated and the grip claw 5 is used.
The elastic ring 1 may be grasped from the outside only by 2, 53, so that if the grasping portion of the elastic ring 1 is accurately specified, the elastic member of the elastic ring 52 causes the claw member 52 to be grasped.
It can be held by the concave portions of a and 53a.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

That is, according to the elastic ring assembling apparatus of the present invention, the elastic ring can be assembled to the object to be assembled by a simple operation with a simple structure having few driving devices. In particular, since the number of rotary drive devices is smaller than that of the conventional one, an inexpensive device can be provided. Moreover, in the present invention, since the elastic ring is held by the gripping claws that are gripped from the outside and deformed into an elliptical shape to be mounted on the assembly target body, at least a device that expands from the inside of the conventional elastic ring is used. According to the present invention, a pair of gripping claws can be easily assembled, while three supporting claws are required.

[Brief description of drawings]

FIG. 1 is a partial sectional side view of an elastic ring assembling apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the elastic ring assembling apparatus, and FIG. 3 is a portion of the elastic ring assembling apparatus. Sectional front view and FIG. 4 are plan views of the gripping claws in the elastic ring gripping state, and FIGS. 5 (a), (b), (c), (d) and (e).
Is a front view showing the relationship between the gripping device and the assembly during operation of the elastic ring assembly of one embodiment of the present invention, and FIGS. 6 (a), 6 (b) and 6 (c) are other assemblies. It is a front view which shows the relationship between the holding device and the to-be-assembled body at the time of the operation | work which attaches an elastic ring to an attached body. DESCRIPTION OF SYMBOLS 1 ... Elastic ring, 2 ... Assembly body, 10 ... Moving device, 11 ... Base, 20 ... Rotation drive device, 30 ... Support body, 40 ... Elevating drive device, 50 ... Grasping device, 51 ... Support member, 51a , 51b ... Fixed claw portion, 52, 53 ... Gripping claw, 52a, 53a ... Claw member, 54 ... Cam member, 60 ... Pressing device, 63 ... Pressing metal (pressing member)

Claims (1)

[Scope of utility model registration request] 1. A base that moves in a horizontal direction and a vertical direction,
A rotation driving device fixed to a support portion extending from the base;
A support body having one end connected to a rotation shaft of the rotation drive device and the other end swingably supported by the base; and at least a pair of grip claws mounted on the support body to expand, contract, and close. The pressing device has a gripping device that grips the elastic ring at least from the outside by the gripping claws, deforms it into an elliptical shape, and holds it, and a pressing member that is movably supported in the direction of the assembly body to which the elastic ring is assembled. An elastic ring assembling device, comprising: a pressing device that presses and drives the member in contact with one end of a long axis portion of the elastic ring deformed into the elliptical shape.