JPH0518726U - Pull rod joint device for tube expander - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a pull rod joint device for a pipe expander that can be easily attached and detached and occupies as little space as possible while maintaining high joint efficiency. In the coupling device, a female screw (32) is cut on the inner periphery of a sleeve (31), and the female screw (32) is circumferentially formed at a predetermined equal interval along the axial direction of the sleeve (31) to a substantially central portion thereof. A joint (30) in which a long groove (33) is provided in 32) and a circumferential groove (34) is provided at the end portion of the central portion of the long groove (33).
And a male screw (11) is cut on the outer periphery of one end, and long grooves (12) are provided in the male screw (11) at predetermined equal intervals in the circumferential direction,
It is composed of a pull rod (10) having a liner (13) of a predetermined shape attached to its end surface, and a piston rod (20) having an external thread (21) cut on the outer circumference at one end. The pull rod (1
0) is engageable with the female thread (32), the circumferential groove (34) and the long groove (33) of the fitting (30), and the one end of the piston rod (20) is the female thread () of the fitting (30). 32) so that it can be engaged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint device for large-scale metal working machines, and more particularly to a pull rod joint device for a pipe expanding machine.

[0002]

[Prior Art]

 There are joints used for large-scale metal working machines and the like, for example, joints that connect a pull rod and a piston rod of a mechanical pipe expander in a UOE process for manufacturing large diameter pipes.

An example of the tube expander is shown in FIG. The pull rod 1 is connected to the piston rod 2 by a joint 3 and expands and contracts the expansion segment 4. When the pipe size to be piped exceeds a certain range, the pull rod and the parts attached to the pull rod 1 must be replaced.

In this case, the structure of the joint is a screw joint 3a in order to withstand a large tensile force, as shown in FIG. However, in order to simplify and streamline the replacement work, as shown in FIG. 10B, a half threaded joint 3b, a pin joint 3c, or the like may be used.

The half-threaded screw joint 3b requires time and effort for screw pitch adjustment work and bolt fastening and loosening. The pin joint 3c requires a large space and requires equipment costs.

Therefore, in order to improve these joints, a pair of complementary concave-convex connecting metal fittings (Japanese Utility Model Publication No. 52-156741) has been proposed. Further, a fitting rotation type joint (Japanese Patent Laid-Open No. 63-252625) has been proposed.

However, these joints also require a relatively large space and increase the equipment cost.

[0008]

[Problems to be solved by the device]

 An object of the present invention is to obtain a pull rod joint device for a pipe expander which can be easily attached / detached and occupies as little space as possible while maintaining high joint efficiency.

[0009]

[Means for Solving the Problems]

 The pull rod joint device for a pipe expander of the present invention is such that an internal thread is formed on the inner circumference of the sleeve, and long grooves are provided in the internal thread along the axial direction of the sleeve at substantially equal intervals in the circumferential direction at predetermined intervals. A joint provided with a circumferential groove at the end of the central portion of the long groove, and a male screw is cut on the outer circumference of one end. It consists of a attached pull rod and a piston rod with an external thread on the outer periphery of one end, one end of the pull rod can engage with the female thread, the circumferential groove and the long groove of the joint, and one end of the piston rod with the female thread of the joint. The above-mentioned problems are solved by means of enabling the engagement.

[0010]

[Action]

 The joint and the piston rod are connected to the central portion in the longitudinal direction (axial direction) of the joint by ordinary screw engagement. On the other hand, in the pull rod, the male screw portion and the long groove at the shaft end are first loosely fitted in the long groove and the screw portion of the joint in the axial direction by the guide of the projection of the liner. As it is, slide the joint on the shaft end and stop it in place. Then, when the shaft or the joint is relatively rotated in the predetermined direction by a predetermined angle, the screw parts of both are screwed together. At this time, the projection of the liner fits into the circumferential groove at the center of the joint, preventing the pull rod and the joint from falling off.

[0011]

【Example】

 An embodiment of a pull rod joint device for a pipe expander according to the present invention will be described with reference to FIGS. 1 to 8.

FIG. 1 is an exploded perspective view of a joint device according to the present invention. The joint device of the present invention comprises a joint 30, a pull rod 10 and a piston rod 20.

As shown in FIGS. 2 and 3, the joint 30 is formed by cutting an internal thread 32 on the inner circumference of the sleeve 31 and by circumferentially dividing the internal thread 32 along the axial direction of the sleeve 31 to a substantially central portion thereof at a predetermined equal interval. 32, a long groove 33 is provided, and a circumferential groove 34 is provided at the end portion of the central portion of the long groove 33.

As shown in FIGS. 1 and 4, the pull rod 10 has a male screw 11 cut on the outer periphery at one end, long grooves 12 are provided in the male screw 11 at predetermined equal intervals in the circumferential direction, and a liner 13 having a predetermined shape is attached to the end face. It has a different structure.

As shown in FIG. 5, the shape of the liner 13 has a recess 131 that matches the long groove 11 of the pull rod 10 and a protrusion 132 that is somewhat higher than the male screw 11 of the pull rod 10.

As shown in FIG. 1, the piston rod 20 has a structure in which a male screw 21 is cut on the outer circumference at one end.

A case in which the pull rod 10 of the mechanical expander is connected to the piston rod 20 using the joint 30 shown in FIGS. 2 and 3 will be described with reference to FIGS. 6 to 8.

First, as shown in FIG. 1, the female screw portion 32 (FIG. 2) of the right half of the joint 30 is screwed onto the male screw 21 of the piston rod 20. Next, the male screw 11 and the long groove 12 of the pluton rod 10 are aligned with the long groove 33 and the female screw 32 (FIG. 2) of the left half of the joint 30, and the pull rod 10 is inserted into the joint 30. At this time, the concave portion 131 and the protrusion 132 of the liner 13 serve as a guide when inserting the both and prevent the screws 11 and 32 of the both from being damaged.

The state at the time of insertion is shown in FIG. That is, the female thread 32 of the joint 30 fits into the long groove 12 of the pull rod 10, and the long groove 33 of the joint 30 fits into the male thread 11 of the pull rod 10.

Next, the pull rod 10 is rotated by a predetermined angle in the screw engagement direction. For example, rotate it about 45 degrees to the right. The state of attachment and connection at this time is shown in FIG.

As shown in FIG. 6, it is also possible to provide a hole 35 in the joint 30 and insert the rod 5 therein to rotate the joint 30 by a desired angle. At this time, the hole 30 and the screw hole 14 formed in the pull rod 10 are aligned with each other, and a threaded pin (FIG. 8) is screwed into the hole 35, whereby the joint 30 is fixed to the pull rod 10 and rotation is prevented.

As shown in FIG. 8, it is preferable that the long groove 12 of the pull rod 10 and the long groove 33 of the joint 30 be provided with screw holes 14 and holes 35, respectively.

[0023]

[Effect of the device]

 Since the joint device of the present invention is basically a screw joint connection, it can withstand a large tensile load. Moreover, since the long groove is only provided, the occupied space is not different from the conventional threaded joint. By using the long groove, the attaching and detaching work of the joint is significantly improved. Moreover, the liner provided at the tip of the pull rod can prevent damage to the screw and facilitate quick insertion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a joint device of the present invention.

FIG. 2 is a vertical sectional view of a joint of the joint device of the present invention.

3 is a cross-sectional view of FIG. 2, (A) and (B).
The figure shows IIIA-IIIA and IIIB-III in FIG.
It is the cross-sectional view seen from B.

FIG. 4 is a plan view of the tip portion of the pull rod that constitutes the joint device of the present invention.

5 is a front view seen from the line VV in FIG. 4. FIG.

FIG. 6 is a cross-sectional view of a mounting operation example of the joint device of the present invention.

FIG. 7 is a cross-sectional view of the joint device of the present invention before mounting and coupling (A) and a sectional view after mounting and coupling (B).

FIG. 8 is a partial cross-sectional view of an example of a rotation stopping means of the joint.

FIG. 9 is a vertical sectional view of a conventional tube expander.

FIG. 10 is a perspective view of a conventional joint.

[Explanation of symbols]

 10 Pull rod 20 Piston rod 30 Joint

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F16L 19/00 7123-3J 37/24 9137-3J

Claims (1)

[Scope of utility model registration request] 1. An internal thread is formed on the inner circumference of a sleeve, and long grooves are provided in the internal thread at predetermined equal intervals in the circumferential direction along the axial direction of the sleeve to a substantially central portion thereof. On the outer periphery of one end, a male rod is cut on the outer periphery of one end, and long grooves are formed on the male screw at regular intervals in the circumferential direction, and a liner of a predetermined shape is attached to the end face. A pipe expander comprising a piston rod with a male thread cut off, one end of the pull rod engageable with a female thread, a circumferential groove and a long groove of the joint, and one end of the piston rod engages with a female thread of the joint. Pull rod joint device.