JP3267494B2 - Pipe insertion ring press-fitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting device for a tube insertion ring.

[0002]

2. Description of the Related Art As one type of pipe joint, there is a slip-on type pipe joint. This slip-on type pipe fitting is configured such that a receiving material and a receiving material can be joined by inserting a sealing material into the receiving material while compressing the sealing material into the receiving material. ing. As a configuration in which a slip-off preventing function is added to such a slip-on type pipe joint, a slip-off preventing pipe joint having a configuration shown in FIG. 6 has been proposed.

That is, in FIG. 6, a receiving port 2 is formed at one end of one of the cast iron pipes 1 joined to each other.
The inner peripheral surface of the receiving port 2 is formed by using a core when casting the tube 1. An annular rubber sealing material 4 is disposed in the sealing material housing groove 3 on the inner periphery of the receiving port 2, and a lock ring housing groove 5 is formed on the back side of the sealing material housing groove 3. Is provided with a lock ring 6 divided in a circumferential direction. Between the outer peripheral side of the lock ring 6 and the inner peripheral side of the lock ring accommodating groove 5, a holding rubber ring 7 for holding the lock ring 6 is arranged. Adhered to the outer circumference.

On the outer periphery of the distal end of the insertion port 9 of the other cast iron tube 8, a projection that can engage with the lock ring 6 from the back side of the reception port is provided.
10 are formed. A tapered surface 11 serving as a guide when inserting the insertion port 9 into the receiving port 2 in which the sealing material 4 and the lock ring 6 are accommodated is formed on the outer periphery of the distal end of the insertion port 9 including the projection 10. ing.

A projection 10 having a tapered surface 11 is formed by press-fitting a cylindrical insertion ring 12 around the outer periphery of the insertion port 9 and fixing it by welding or the like. Both are formed by tapering.

[0006]

When manufacturing a cast iron pipe having the above-structured receiving port 1 at one end of the pipe and the insertion port 9 at the other end of the pipe, the core in the receiving port after casting is manufactured. It is necessary to remove the sand, and as described above, the insertion ring 12
Since it is necessary to press-fit the same, there is a problem that the production is troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to make it possible to efficiently press-fit an insertion ring and remove core sand.

[0008]

In order to achieve this object, the present invention has a receiving port at one end and an insertion port at the other end, and the inner peripheral surface of the receiving port is formed by a core. An apparatus for press-fitting an insertion ring into the outer periphery of the insertion port of a cast iron pipe, by holding means for holding the insertion ring, and moving the holding means holding the insertion ring in the pipe axis direction. A press-fitting means for press-fitting this insertion ring into the outer periphery of the insertion port of the cast iron tube in which a core for forming the inner peripheral surface of the reception port is left, and from the opening end side of the reception port to the core. The core is configured to have a core collapse blade for contacting and receiving a force at the time of press-fitting of the core by the press-fitting means, and collapsing the core by this force.

According to such a configuration, when the insertion ring is pressed into the outer periphery of the insertion hole by the holding means, the force is received by the core collapse blade and at the same time, the core is collapsed by the core collapse blade based on this force. Since it is possible to disintegrate and remove the core, it is possible to efficiently perform both steps of press-fitting the insertion ring and removing the core at once.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 20 denotes a cast iron pipe having a receiving port 21 formed at one end and an insertion port 22 formed at the other end. The cast iron tube 20 is manufactured by a centrifugal casting method using a rotary mold, and an inner peripheral surface of a receiving port 21 is formed in a predetermined shape by an annular core 23. A tapered surface 24 is formed on the outer periphery of the distal end of the insertion opening 22. The cast iron tube 20 is supported in a horizontal direction by a suitable supporting means, and is movable in the tube axis direction while being supported in the horizontal direction.

Reference numeral 25 denotes a press-fitting device, which is a ring cylindrical holding portion 27 as holding means for holding the insertion ring 26, and a pressure which comes into contact with one end of the insertion ring 26 and transmits a pressure input to the insertion ring 26. An input transmission ring 28, a housing portion 29 for accommodating the pressure input transmission ring 28, and a hydraulic cylinder 30 as a press-fitting means connected to the housing portion 29, are arranged coaxially with the cast iron pipe 21. ing.

As shown in FIG. 4, at a plurality of positions in the circumferential direction inside the holding portion 27, holding protrusions 32 pressed radially inward by a spring 31 are provided, respectively. 26 is held coaxially with the cast iron tube 20 by the plurality of holding projections 32.

As shown in FIG. 3, holding projections 34 which are similarly pressed inward in the radial direction by springs 33 are provided at a plurality of positions in the circumferential direction inside the housing portion 29, respectively. As a result, the pressure input transmission ring 28
Are held coaxial with the insertion ring 26. Further, the pressure input transmission ring 28 is configured to be divided into a plurality of parts along the circumferential direction, and a fitting structure of the projection 36 and the concave part 37 is adopted in the divided part 35. For this reason, the pressure input transmission ring 28 can freely expand in the housing portion 29 against the force of the spring 33 within a range in which the projection 36 and the concave portion 37 are engaged with each other.

At a position corresponding to the receiving port 21 of the cast iron tube 20, a core collapse blade 38 is provided. As shown in FIG. 5, the core disintegrating blade 38 has a configuration in which four L-shaped blades 39 are radially arranged.
It is formed with small dimensions so that it can be inserted into 41. When the core 23 is not present, the blades 39
It can be inserted into the inside. Base end of core collapse blade 38
42 has an end surface 44 in a direction parallel to the opening end surface 43 of the receiving port 21 of the cast iron tube 20, and is installed in a state of being firmly attached to an appropriate fixing portion.

In such a configuration, the cast iron tube 20 in a state where the core 23 has not been removed after casting is horizontally supported as shown in FIG. The insertion ring 26 is held by 32.

In this state, the hydraulic cylinder 30 is operated to move the housing portion 29 and the holding portion 27 together, so that the insertion ring 26 is brought into contact with the tip of the insertion opening 22 of the cast iron pipe 20. When the hydraulic cylinder 30 is further operated, the cast iron pipe 20 is pushed by the insertion ring 26 and moves in the pipe axis direction, and the core 23 of the receiving port 21 covers the distal end portion 40 of the core collapse blade 38.

When the hydraulic cylinder 30 is further operated from this state, the cast iron tube 20 is received by the core collapse blade 38, and this receiving force is generated. As shown in FIG. Upon receiving a press input from a press input transmission ring 28 accommodated in the housing portion 29, the press input is guided by the tapered surface 24 and press-fitted into the outer periphery of the insertion opening 22. Similarly, the press input transmission ring 28 is also guided by the tapered surface 24 and expands its diameter to cover the insertion opening 22. After all, the housing part as shown
Press-fitting is performed until the distal end surface 46 of the insertion port 22 hits the rear end face 45 of the 29, and the insertion ring 26 is a distance from the distal end face 46 of the insertion port 22 corresponding to the length of the press-input transmission ring 28 in the pipe axis direction. It will be press-fitted as far as possible.

At this time, the core 23 has a core collapse blade 38 at the same time.
When the core collapsing blade 38 is pushed into the core 23 by this reaction force, the core 23
The collapse takes place. Then, the hydraulic cylinder 30 is operated until the opening end face 43 of the receiving port 21 contacts the end face 44 of the base end portion 42 of the core collapse blade 38.

Thus, the press-fitting work of the insertion ring 26 and the collapsing work of the core 23 are completed, and the hydraulic cylinder 30 is operated in the opposite direction. Then, the press-fitting device 25 becomes the insertion ring 26
The pressure input transmission ring 28 is reduced in diameter to its original state by the action of the spring 33 and the holding projection 34 while leaving the insertion port 22 while leaving the insertion port 22 of the cast iron tube 20. Finally, the port 21 of the cast iron tube 20 is separated from the core collapse blade 38, and the cast iron tube 20 is carried out. The unloaded cast iron tube 20 is inserted as in the case of FIG.
The tip of 22 and the insertion ring 26 are tapered.

[0020]

As described above, according to the present invention, when the insertion ring is pressed into the outer periphery of the insertion hole by the holding means, the force is received by the core disintegrating blade, and at the same time, the core disintegration is performed based on this force. Since the core can be disintegrated and removed by the blade, both the steps of press-fitting the insertion ring and removing the core can be efficiently performed at once.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a press-fitting device for a tube insertion ring according to the present invention.

FIG. 2 is a view showing an operation state of the press-fitting device for the insertion ring of the pipe of FIG. 1;

FIG. 3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a sectional view taken along line BB in FIG. 1;

FIG. 5 is a perspective view of a core collapse blade in FIG. 1;

FIG. 6 is a view exemplifying a separation prevention pipe joint using a pipe with an insertion ring.

[Explanation of symbols]

 20 Cast iron tube 21 Reception port 22 Insertion port 23 Core 26 Insertion ring 27 Holder 28 Press input transmission ring 29 Housing 30 Hydraulic cylinder 38 Core collapse blade

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 29/00 F16L 13/12 F16L 21/00 F16L 21/02 F16L 21/08

Claims (1)

(57) [Claims] 1. A cast iron pipe having a receiving port at one end and a receiving port at the other end, and an inner peripheral surface of the receiving port formed by a core. A press-fitting device, comprising: holding means for holding the insertion ring; and moving the holding means for holding the insertion ring in a tube axis direction, thereby inserting the insertion ring into the socket. Press-fitting means for press-fitting the outer periphery of the insertion opening of the cast iron tube in which the core for forming the peripheral surface remains, and contacting the core from the opening end side of the receiving port and press-fitting the core by the press-fitting means And a core disintegration blade for receiving the force of (1) and disintegrating the core by this force.