JPH0144281Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention has an insulating material in the hollow shaft center (hereinafter also referred to as shaft core cavity) of the squirrel-shaped wire spool around which the welding wire is wound. This invention relates to a cylindrical body inserter for inserting a cylindrical body.

[Conventional technology]

For example, welding wire (hereinafter simply referred to as wire)
When welding is performed by pulling out a wire from a wire spool wrapped with It is composed of On the other hand, in recent years, a metal cage-shaped spool as shown in FIG. 5 has been developed from the viewpoint of resource saving and pollution prevention, and has been hailed as a reusable spool. In other words, the cage-shaped spool is
For example, a plurality of spool elements a, b, c... formed by bending one metal wire (usually a steel wire) 1 are arranged in a circular shape, and the radial rims of adjacent spool elements are joined to each other to form a spool. It is inexpensive, lightweight, and has sufficient strength, so its range of use is expanding as an alternative to plastic spools.

[The problem that the idea aims to solve]

By the way, if the wire wound around the above-mentioned squirrel-shaped spool is attached to the spool holder of a welding device and welding work is performed, an electrical short circuit will occur between the energized wire and the metal rotating shaft. Therefore, a means to electrically insulate the two is required. Therefore, a cylindrical body made of a highly insulating plastic material is inserted into the shaft core cavity of the spool to prevent electrical short circuit accidents between the wire and the metal rotating shaft. .

FIG. 6 is a cross-sectional view of the main part showing the state in which the cylindrical body 2 is inserted into the spool. are inserted concentrically. Furthermore, annular protrusions 3, 3, which are a type of engagement protrusion that are engaged with the inner side of the annular member 5, are formed on the outer circumferential surface of both ends of the cylindrical body 2, and after being inserted into the spool, the annular member 5 The annular protrusion 3 is positioned inside and engaged with the annular protrusion 3. That is, the annular protrusion 3 serves as a stopper, and the cylindrical body 2 inserted into the cavity 4 is prevented from moving outside the cavity 4, so that there is no possibility that the cylindrical body 2 will come off after insertion. Never. In this way, the cylindrical body 2 must be inserted into the cavity 4 of the spool and must not come off after that, so the outer diameter Ao of the cylindrical body 2 must be smaller than the inner diameter B of the cavity 4. On the other hand, the condition that the outer diameter H of the annular protrusion 3 is larger than the inner diameter B of the cavity 4 must be satisfied.

By the way, when inserting the cylindrical body 2 formed as described above into the cavity 4 of the spool, after arranging the cavity 4 and the cylindrical body 2 on the same axis, the cylindrical body 2 is directed toward the cavity. A common method is to insert the annular projection 3 by pushing it in, but as mentioned above, the outer diameter H of the annular protrusion 3 is larger than the inner diameter B of the cavity 4, so the cylindrical body 2 can be deformed to some extent. It is necessary to align the axes and push it in while supporting it from the inner side, and conversely, after inserting the cylinder, the above-mentioned support of the cylinder 2 can be released and it can be smoothly removed from the cylinder 2. It has been desired to develop a push-insertion device of this type.

[Means to solve problems]

The present invention was developed in view of the above-mentioned circumstances, and aims to provide an insertion tool that allows the insertion of a cylindrical body to be performed extremely easily and reliably.

In other words, the structure of the present invention that achieves the above purpose is as follows.
The cylindrical body insertion tool is composed of a main body part that can move forward and backward toward the standby position of the wire spool, and a head part with a guide taper that can move back and forth along the axial direction of the main body part. A stopper for locking the end surface of the cylindrical body is fixedly provided, and an annular elastic support body that can expand and contract in the radial direction as the head moves forward and backward is disposed between the main body and the head;
The outer circumferential surface of the elastic support is formed to press and support the inner surface of the cylindrical body during expansion, and the maximum outer diameter of the head portion is formed to be the same as or smaller than the inner diameter of the cylindrical body, and the maximum outer diameter The gist is that the difference between the diameter and the inner diameter of the cylindrical body is within the range of 0 to 2 mm.

[Function and Examples]

FIG. 1 is a cross-sectional view of a main part showing a typical embodiment of the present invention. A main body part 9 is joined to the drive device 15, and the distal end side of the main body part 9 has a movable member that can freely move forward and backward on the same axis. A head portion 8 is provided. A ring-shaped elastic support 10 is provided between the main body 9 and the head 8. Further, numerals 11 and 12 are air pressure inlet holes, 1
1a is a cylinder chamber on the pull side, 12a is a cylinder chamber on the push side, and 13 is a notch portion cut out in the circumferential direction to enhance the deformability of the elastic support 10. Further, 14 indicates a piston head connected to the head 8, and 20 indicates a stopper for locking the end surface of the cylindrical body. That is, when the end face of the cylindrical body 2 inserted through the outside of the head part 8 hits the locking stopper 20 and is inserted into the predetermined position of the main body part 9, the pull side cylinder Air is pressurized into the chamber 11a, and the piston head 1
4 toward the push-side cylinder 12a (towards the right in the drawing). At this time, since the head portion 8 is connected to the piston head 14, it moves together with the piston head 14 in the direction of the arrow RO. When the head section 8 moves in this manner, the distance between the head side end surface 8c and the main body side end surface 9a becomes shorter, so that the elastic support 10 inserted between both end surfaces 8c and 9a is compressively deformed so as to be sandwiched. Raise the outer support surface 10a
is pushed out in the radial direction as shown in the direction of arrow C,
The outer peripheral side support surface 10a reaches the inner peripheral surface of the cylindrical body 2 and continues to bulge to press the inner peripheral surface of the cylindrical body 2 outward. That is, the pressed cylindrical body 2 is stably supported on the outside of the main body part 9. When the cylindrical body 2 is supported in this way, the drive device 15 is operated to move the entire cylindrical body insertion tool 7 toward the waiting spool and insert the cylindrical body 2 into the cavity 4. At this time, since the cylindrical body 2 is only supported by the elastic support 10, a sufficient amount of deformation is ensured when the annular protrusion 3 exceeds the annular member 5, as will be described later.
After the cylindrical body 2 has been inserted into the spool, the air in the pull-side cylinder chamber 11a is extracted, and air is pressurized into the push-side cylinder chamber 12a through the air pressure inlet hole 12 to move the piston head 14 in the opposite direction of the arrow B. The compressive deformation of the elastic support body 10 is restored and reduced in diameter, and the support of the cylindrical body 2 is released. Next, when the drive device 15 is operated again to return the cylindrical body insertion tool 7 to its original position, only the cylindrical body 2 is retained in the cavity 4 of the spool, completing one cycle of insertion work.

2 to 4 are explanatory diagrams showing the procedure for inserting the above-described cylindrical body 2 into the annular member 5 of the spool.

The maximum outer diameter of the base side 8a of the guide tapered surface in the head portion 8 is C, the outer diameter of the main body portion 9 is D, the outer diameter of the elastic support 10 when expanded (indicated by a solid line) is E, and the outer diameter when contracted is (shown by a virtual line) is F, the inner diameter of the cylindrical body 2 to be inserted is Ai, and the outer diameter (excluding the annular protrusion 3) is Ao. The following relationship holds: B≧Ao>Ai≧C>D. E≧Ai, Ai>F In other words, the cylindrical body insertion tool 7 is inserted into the cylindrical body 2 with the head portion 8 at the tip, and the stopper 20 is inserted into the cylinder body. When one end of the body 2 is reached, the head portion 8 is moved as described above to enlarge the radius of the elastic support 10. As a result, the outer circumferential surface of the elastic support 10, which expands to become larger than the inner diameter Ai of the cylindrical body 2, presses the cylindrical body 2 from the inside so as to spread it apart, thereby holding it on the same axis from the inside. If the cylindrical body 2 can be gripped by the elastic support 10 in this manner, the cylindrical body 2 will not fall off even if the cylindrical body insertion tool 7 is displaced downward. Therefore, it is also possible to insert and install the cylindrical body 2 by changing the position as shown in FIGS. 3 and 4. That is, the held cylindrical body 2 is
As shown in FIG. 3, the cylindrical body inserter 7 is inserted into the annular member 5 of the spool. At this time, the cylindrical body 2 is held by the cylindrical body insertion tool 7, but a gap 9a corresponding to 1/2 (Ai-D) is formed on the inner peripheral surface side of both ends of the cylindrical body 2. Therefore, even if the annular protrusion 3 formed on the outer periphery of the cylindrical body 2 is pressed toward the axis by the annular member 5 when passing inside the annular member 5, the cylindrical body 2 will not be deformed in the gap 9a. can absorb costs. Further, since the cylindrical body insertion tool 7 is equipped with a head portion 8 whose tip is formed into a streamlined shape, the central axis of the annular member 5 and the cylindrical body insertion tool 7 are
Even when the axes of the two do not coincide, the tapered surface 8b of the head portion 8 serves as a guide and can align the axes. Therefore, it is also possible to fully automate the insertion of the cylindrical body 2 into the cavity 4. On the other hand, if the maximum outer diameter C on the root side of the head portion 8 is formed to be as close as possible to the inner diameter Ai of the cylindrical body 2 as described later, the cylindrical body can be easily inserted into the cavity 4. It is possible to prevent the end surface 2a of 2 from impacting the inner surface of the annular member 5 as much as possible. Moreover, making the maximum outer diameter C on the base side larger than the inner diameter Ai of the cylindrical body 2 means that the cylindrical body 2 is
This method cannot be adopted in the present invention because it may cause the material to be pulled out as it is. Therefore, the inner diameter of the cylindrical body 2
Unless Ai and the maximum outer diameter C of the head portion 8 are Ai≧C, smooth insertion and extraction operations cannot be performed.

When the cylindrical body 2 is inserted into the annular member 5 of the spool as described above, the diameter of the elastic support 10 is reduced as shown in FIG.
, and then move the cylindrical body insertion tool 7 in the direction of the white arrow A and pull out the cylindrical body insertion tool 7 from the inside of the cylindrical body 2. That is, since the elastic support 10 is reduced in diameter and the outer diameter F of the elastic support 10 becomes smaller than the inner diameter Ai of the cylindrical body 2, the support of the cylindrical body 2 is released. At this time, the inner diameter Ai of the cylindrical body 2 is
Since the outer diameter of the cylindrical body 2 is larger than the outer diameter of the cylindrical body 2, a space is formed between the cylindrical body 2 and the main body 9. Since the cylindrical body insertion tool 7 is pulled out from the cylindrical body as described above, the maximum outer diameter C on the base side of the head portion 8 and the inner diameter Ai of the cylindrical body 2 are such that Ai≧C as described above. Therefore, when the cylindrical body insertion tool 7 is pulled out, the root part 8a of the head part 8 may come into strong contact with the end surface 2a of the cylindrical body 2 or the inner peripheral surface of the cylindrical body 2, and the cylindrical body 2 may be dragged out of the spool. There isn't. For this reason, the outer diameter C of the head portion 8 and the inner diameter Ai of the cylindrical body 2 are
The larger the difference between them, the easier it is to perform the above-mentioned pulling operation, but conversely, if the difference between the outer diameter C and the inner diameter Ai becomes too large, contact with the annular member 5 when inserting the cylindrical body 2 becomes unavoidable, and the root part The end face protection function of 8a is degraded. Therefore, in order to satisfy both the pull-out workability and the edge protection function, 2≧Ai−C≧0.
Approximately mm.

In this way, the cylindrical body insertion tool 7 of the present invention can expand and contract the diameter of the elastic support body 10 of the cylindrical body insertion tool 7 in accordance with the insertion and withdrawal of the cylindrical body. The support can be released very easily, and the wire spool can be reliably inserted into the hollow shaft center without damaging the cylindrical body.

[Effect of idea]

Since the present invention is configured as described above, the following effects can be obtained.

When forcing the cylindrical body into the inside of the annular member of the wire spool, by using an elastic support that can expand and contract in the radial direction, the cylindrical body can be reliably held in alignment with the axis of the inserter and can be detached. The insertion work can now be performed extremely easily and reliably.

By forming a guide tapered head portion with an appropriate diameter at the tip of the insertion tool, the hollow shaft center of the wire spool and the shaft center of the held cylindrical body can be approximately aligned, and the annular member of the wire spool There is no possibility of damage caused by bumping into the cylindrical body.

Productivity is improved because the cylindrical body insertion work can be automated.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory diagram showing a typical embodiment of the present invention, Figs. 2, 3, and 4 are explanatory diagrams illustrating the procedure for inserting a cylindrical body using the cylindrical body insertion tool according to the present invention, and Fig. 5 FIG. 6 is a perspective explanatory view illustrating the welding wire spool, and FIG. 6 is a sectional view showing the main parts of the wire spool. DESCRIPTION OF SYMBOLS 1... Metal wire, 2... Cylindrical body, 3... Annular protrusion, 4... Cavity, 5... Annular member, 7... Cylindrical body insertion tool, 8... Head part, 9... Main body part , 10...
...Elastic support body, 15... Drive device.

Claims (1)

[Scope of Claim for Utility Model Registration] Cylindrical body insertion for inserting an insulating cylindrical body with engagement protrusions formed on the outer periphery of both ends into the hollow shaft center of a wire spool having annular members at both ends in the axial direction The cylindrical body insertion tool is composed of a main body part that can move forward and backward toward the standby position of the wire spool, and a head part with a guide taper that can move back and forth in the axial direction of the main body part. A stopper for locking the end surface of the cylindrical body is fixed to the outer periphery of the main body, and an annular elastic support that can be expanded and contracted in the radial direction as the head moves forward and backward is disposed between the main body and the head. The outer circumferential surface of the elastic support is formed so as to press and support the inner surface of the cylindrical body during expansion, and the maximum outer diameter of the head portion is formed to be the same as or smaller than the inner diameter of the cylindrical body, A cylindrical body insertion device characterized in that the difference between the maximum outer diameter and the cylindrical inner diameter is within a range of 0 to 2 mm.