JPH0747180B2 - Inner surface processing equipment for pneumatic tube - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for processing the inner surface of a pneumatic tube so as to be suitable for pneumatically transporting plastic granules (pellets).

[Problems to be Solved by Conventional Techniques and Inventions]

This type of pneumatic tube is made of metal to prevent static electricity.
When pneumatically transporting the plastic granules (pellets), the inner surface of the air tube may slide and the frictional heat generated at this time may melt the surface.To prevent this, the inner surface of the metal tube is knurled. An apparatus for press working has been proposed, and for example, the conventional Japanese Utility Model Publication No. Sho 63-20418 is known.

In this device, a fluid cylinder that advances and retreats in a direction orthogonal to the axis is provided at the tip of a long support shaft, and the knurl is pressed radially by this fluid pressure to form irregularities on the inner surface of the metal pipe with the knurl. Although it is formed, the long support shaft is easily bent due to its own weight, etc., and at the tip of the support shaft,
The core of the metal tube is misaligned, which makes it difficult to form uniform unevenness on the entire inner surface, and the multiple knurls are unevenly contacted, making it impossible to perform high-precision machining. There was a problem.

[Means for solving problems]

In order to solve such a problem, the present invention provides an inner surface processing apparatus for a pneumatic tube for knurling the inner surface of a metal tube to form irregularities. Is provided with a fluid cylinder part having a moving element that moves forward and backward in a direction orthogonal to the knurl provided at the tip of the moving element of the fluid cylinder part. There is provided a center holding mechanism having a resiliently urged rotary contact which contacts the inner surface of the metal tube so as to be aligned with the axis.

[Action]

The mover of the fluid cylinder part is moved in the outer diameter direction by the fluid pressure, and the knurl at the tip thereof is pressed against the inner surface of the metal pipe (by the fluid pressure), and the relative circumferential direction and the axial direction of the metal pipe and the knurl are formed. As a result of the movement of, the unevenness is formed on the inner surface of the metal. At this time, the rotary contact of the center holding mechanism is in the vicinity of this knurl and matches the axial center of the tip of the support shaft with the axial center of the metal tube (prevents misalignment).
Thus, it elastically abuts on the inner surface of the metal tube and rolls. As a result, the plurality of knurls come into contact with the inner surface of the metal tube with a uniform pressing force to form highly accurate unevenness.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

In FIG. 3, M is a metal tube as a material for the pneumatic tube, which is horizontally supported by the support frames 12 ... Standing at a predetermined interval (in the left half of the figure) of the horizontal bed 11. The metal tube M is supported (fixed). In the right half of bed 11 in the figure, rail 13
Is laid, and a carriage 14 reciprocates on the rail 13 as indicated by arrows A and B.

Reference numeral 7 denotes a support shaft, which is arranged on an extension line of the axis of the metal tube M held by the support frames 12 ... That is, at the support portion 15 at the center of the bed 11, the tip or middle of the support shaft 7 is
It is rotatably and axially movably supported, and the base end of the support shaft 7 is connected to the drive shaft 16 of the carriage 14 to be horizontally supported and arranged on an extension of the axis of the metal tube M. It A drive motor and a speed reducer (not shown) are mounted on the carriage 14, and the support shaft 7 is rotationally driven as indicated by an arrow C.

FIG. 1 is an enlarged cross-sectional view of the main part thereof, showing a state in which the carriage 14 of FIG. 3 has moved forward and the support shaft 7 has been inserted into the metal pipe M. The center holding mechanism P is continuously provided at the tip of the support shaft 7 having the length L, and the tip block 1 is provided at the tip thereof.

In the illustrated example, the block 1 is composed of a base end flange portion 2, a tip cylinder tube portion 3, and an intermediate neck portion 4 connecting them, and the axis a of the tip cylinder tube portion 3 is the support shaft 7 ( And the center of the block 1) is orthogonal to the axis b of the block 1), and the tip of the cylinder tube portion 3 is opened at the piston chamber hole portion 5 and the intermediate neck portion 4 to the flange portion 2 are formed.
A small-diameter flow path hole 6 is formed along the axis b passing through.

Reference numerals 8 and 8 denote a pair of movers inserted in the piston chamber hole 5 symmetrically by 180 °, and the mover 8 is a short cylindrical piston portion 8a having a diameter slightly smaller than the inner diameter of the hole 5. And a clevis portion 8b protruding from the outer end of the clevis portion 8a. A seal material 9 is fitted in the outer peripheral seal groove of the piston portion 8a, and the clevis portion 8b has a pin 10 for knurling. 17 is rotatably pivoted. This knurl 17 is used to knurl the inner surface 18 of the metal tube M, which is a material of the pneumatic tube, to form irregularities. Depending on how to select it, a plurality of spirals, twills, or other desired shapes can be used. An uneven pattern can be formed on the inner surface 18.

Further, in the illustrated example, the piston portion 8a has a longitudinal groove 19,1.
9 is formed, and a screw hole in the radial direction is opened in the peripheral wall of the tip cylinder tube portion 3, and a stopper member is formed in this hole.
A screw function as 20 is screwed into the groove 19 so that the moving element 8 has a maximum projecting state stopper action (retaining action).
And also functions as a rotation stop around the axis a.

In this way, the fluid cylinder portion 47 is constituted by the cylinder tube portion 3 and the movers 8 and 8 inserted therein.

A plate-shaped intermediate block 23 is detachably connected to the flange portion 2 of the tip block 1 via sealing materials 21 and 22, and sealing materials 24 and 25 are attached to the base end surface of the intermediate block 23.
The front end surface of the support shaft 7 is connected in a pressure-contact manner via.

As shown in FIGS. 1 and 2, the intermediate block 23 has, for example, four flat surface portions formed by cutting on its outer peripheral surface, and radial screw holes 26 ... 2, the screw portions of the protrusion length adjusting spacers 27 are screwed into the screw holes 26 on the left and right sides and the lower portion of FIG. 2, and the screw rods of the bearing member 29 are screwed into the screw holes 28 of the spacer 27. 30 is detachably screwed. The bearing member 29 includes a spherical rotary contact 31 and an elastic member 32 such as a coil spring that elastically biases the rotary contact 31 in the outer diameter direction.
And an outer diameter side storage case portion 33 that accommodates both of them, and the screw rod portion 30 protruding from the case portion 33.

The upper bearing member 29 of FIG. 2 and the bearing member of FIG. 1 show the case where the screw rod portion 30 is directly screwed (without the spacer 27) into the screw hole 26.

It should be noted that in FIG. 2, the spacer 27 is detachably replaced with a spacer having a different size according to the inner diameter of the metal pipe M, and further, the spacer 27 is omitted and illustrated to be applicable. . Therefore, in practice, one of the four cases shown in FIG. 2 is selected and the four bearing members are selected.
29 ... will have the same mounting structure.

As described above, the center block P and the intermediate block 23 and the plurality of bearing members 29 ... The rotary contacts 31 of the center holding mechanism P are attached to the inner surface 18 of the metal tube M.
The elastic urging force of the elastic member 32 elastically and rotatably contacts the elastic member 32 so that the axis b of the tip of the support shaft 7 coincides with the axis of the metal tube M. To act. It is clear from FIGS. 1 and 3 that the distance l between the center holding mechanism P and the knurl 17 is sufficiently small.

In FIG. 2, the central hole 34 is a flow path hole, and many other through holes are holes for mounting bolts to the flange portion 2 and the support shaft 7.

Next, the support shaft 7 has a double pipe structure, and as shown in FIG. 1, has a sufficiently thin inner pipe 35 and a sufficiently large outer pipe 36, and has a distal end wall portion 37 and a proximal end flange portion. At 38, both ends of the outer pipe 36 are closed, and the inner pipe 35 is inserted in the center and fixed by welding or the like to seal the inner pipe 35 through the holes 34, 6 and the piston chamber. It communicates with the hole portion 5. That is, when the pressure fluid is sent through the inner pipe 35 and the holes 34, 6 as shown by the arrow E, the mover 8,
8 projects outward in the radial direction, and the knurls 17, 17 are pressed against the inner surface 18 of the metal tube M by fluid pressure.

Reference numeral 39 denotes an appropriate number of reinforcing members that prevent the middle portion of the long inner tube 35 from bending. The inner pipe 35 is a flow path for sending fluid to the tip cylinder tube portion 3 as described above,
The outer tube 36 is for transmitting rotational torque (for rotating as indicated by arrow C in FIG. 3). Since it has a large diameter, it has the advantage that it can withstand a large amount of this rotational torque and that it can be flexed little.

Further, if desired, a flow path hole 40 as shown by an imaginary line in FIG. 1 may be formed in the blocks 1, 23, etc., and a cooling fluid and / or a rinsing fluid may be supplied as indicated by an arrow G. It is also preferable to spout. Then, as shown in FIG. 1, the length dimension L of the support shaft 7 is sufficiently large, and it is understood that the center holding mechanism P described above is arranged in the vicinity of the most advanced knurls 17, 17.

Next, FIG. 4 shows a modified example, in which the intermediate block 23 and the tip block 1 described in FIG. 1 are integrated. That is, the cylinder tube portion 3 is formed at the tip end of one block 41, and the bearing member mounting flange portion 42 is formed at the base end, and the flow path hole 6a is formed at the axial center, and the tip end of the inner pipe 35 is directly formed. Connected in communication with the opening (Figs. 1 and 4)
See figure comparison). Also in this FIG. 4, the bearing member
Reference numeral 29 indicates that it is detachable and replaceable, and at the same time, shows two cases in which the diameter of the metal tube M is different.

Further, FIG. 5 shows another modification, in which the intermediate block 23 is a split mold, and is attached to the outer peripheral surface of the support shaft 7 (or the tip block 1 (not shown) by bolt nut coupling or the like).
The figure shows the case where it is detachably attached.

As shown by the phantom line in FIG. 1, if a ring-shaped jig 43 is attached to the end of the metal tube M and a working operation is performed, unevenness processing by the knurls 17 ... Has the advantage that waste materials are not generated.

In order to make the inner surface 18 of the metal pipe M uneven by the above-described device, substantially the entire first portion is moved into the metal pipe M without applying fluid pressure to the piston chamber 46 on the inner surface side of the moving elements 8, 8. Insert it as shown in the figure, and move it in the axial direction while rotating it in the circumferential direction, as indicated by arrows C and A in FIG.
The rotary contact 31 of the center holding mechanism P is the inner surface 18 of the metal tube M.
The elastic member 32 is elastically and rotatably contacted by the elastic force of the elastic member 32, and the axial center b of the tip of the support shaft 7 is in good agreement with the axial center of the metal tube M.

Therefore, the fluid pressure is applied to the piston chamber 46, and the moving elements 8 and 8 are moved in the outer diameter direction by the pressure, and the knurls 17 and 17 are moved.
If is pressed against the inner surface, the center holding mechanism P near the knurls 17, 17 causes the axial center b of the tip block 1 to move.
Satisfactorily matches the axis of the metal tube M (centering is performed), and the plurality of knurls 17 and 17 contact each other with a uniform pressing force and with a highly accurate contact angle and posture.

Note that the present invention can be freely modified in design other than the above-described embodiments. For example, rotation (arrow C) and axial movement (arrow A,
It is also possible to adopt a structure in which both or one of the movements in B) is applied to the metal tube M. That is, it is sufficient that the knurls 17, 17 and the metal tube M relatively move in the circumferential direction and the axial direction. Further, instead of the bearing member 29 ...
You may use the rotary body shape and structure which can be smoothly moved to the said circumferential direction and axial direction.

〔The invention's effect〕

On the inner surface 18 of the metal tube M, a plurality of knurls 17 ...
Moreover, it is pressed in a stable and accurate posture, and highly precise unevenness formation is realized.

In particular, even in the case of a long metal pipe M, the support shaft 7 does not bend and high-precision machining is possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional front view for explanation showing four cases of metal tube inner diameters,
FIG. 3 is a side view of an example of the whole, FIG. 4 is a sectional view of a main part of a modification, and FIG. 5 is a front view of a main part of still another modification. M ... Metal tube, P ... Center holding mechanism, 7 ... Support shaft, 8 ... Mover, 17 ... Knurl, 18 ... Inner surface, 31 ... Rotating contact, 35 ...
Inner tube, 36 ... Outer tube, 47 ... Fluid cylinder part.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshiaki Tateno 3-939 Mikuni Honcho, Yodogawa-ku, Osaka City, Osaka Prefecture Japan Aluminum Industry Co., Ltd. (56) References: Mitsuihei 4-80615 Actual Public Sho 63-20418 (JP, Y2) Actual Public Hei 1-444173 (JP, Y2)

Claims (1)

[Claims] 1. An inner surface processing apparatus for a pneumatic tube for forming unevenness by knurling the inner surface of a metal tube, and moving the tip of a long support shaft forward and backward in the direction orthogonal to the support shaft. A fluid cylinder portion having a child is provided, and a knurl for forming the unevenness is provided at the tip of the moving element of the fluid cylinder portion, and further, the axis of the tip of the support shaft is made to coincide with the axis of the metal tube. An inner surface processing apparatus for a pneumatic tube, comprising a center holding mechanism having a rotating contact element that is elastically urged to contact an inner surface of the metal tube.