JP3278279B2 - Tube insertion device and method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for inserting two tubes having different diameters into one tube by inserting the other tube into the other tube. The present invention relates to an apparatus and a method for inserting a pipe used when a protective insulator is inserted into a pipe.

[0002]

2. Description of the Related Art In many cases, protective tubes such as insulators are inserted into various tubes to protect them from external pressure. Conventionally, an insulator is set in a jig composed of a mandrel and an outer cylinder to insert the protective tube, and compressed air is blown from a lower portion and a tube to be protected is inserted from an upper portion. The method required that the tip of the insulator be coincident with the tip of the tube. Also, this insertion must be performed manually, and it has been difficult to achieve automation.

[0003]

As described above, in the conventional pipe inserting apparatus, for example, when a protective insulator is tightly inserted around a rubber pipe, the ends of the large-diameter pipe and the small-diameter pipe are aligned. This has to be done manually, which is labor intensive and hinders automation.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and there is no need to align the ends of both large and small diameter pipes when inserting the small and large diameter pipes. An object of the present invention is to provide a tube insertion device that can easily perform an insertion operation and also enables automation.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a plurality of expanding claws for engaging in one end of a large-diameter tube to be inserted and expanding the end of the large-diameter tube. An air supply port formed in the inside of the large-diameter claw for blowing air into the inside of the large-diameter end, a small-diameter pipe is inserted into the large-diameter pipe from the large-diameter end side, and the inside of the large-diameter claw and the large-diameter pipe are inserted into the inside. Insertion means for contacting the small-diameter pipe, and pull-out means for extracting the large-diameter claws from a contact portion between the large-diameter pipe and the small-diameter pipe, and inserting the large-diameter pipe in tight contact with the periphery of the small-diameter pipe. An apparatus and method for inserting a tube, comprising:

Hereinafter, the present invention will be described in detail. In order to achieve the above object, a pipe insertion device according to the present invention expands a diameter of an end of a large-diameter pipe of a large-diameter pipe and a small-diameter pipe to be inserted, and inserts a small-diameter pipe to the large-diameter section. It is equipped with a diameter expanding and air blowing device having an air supply port for supplying compressed air for smooth operation. The blower and air blower need to move in the longitudinal direction and the diametrical direction of the large-diameter tube and the small-diameter tube. Even when the expander and air blower are fixed to a base to be connected, the base is moved in a predetermined direction. To allow the expanded and air blasters to move as well.

If the number of diameter-expanding and air-blowing devices to be used is two, when the diameter-expanding claws of the diameter-expanding and air-blowing device are engaged with the large-diameter pipe, the diameter is increased in a direction perpendicular to the diameter-expanding direction. In order to reduce the size of the large-diameter pipe, the number of the large-diameter pipes and the air blowers should be at least three, preferably four. The air supply port of the diameter-expanding and air-blowing device is configured such that compressed air is blown onto the inner surface of the large-diameter pipe so as to expand the inner diameter of the end of the large-diameter pipe. And it is formed so as to penetrate the inside of the diameter expanding claw of the air blower.

When the expanding claws are engaged with the inner end of the large-diameter tube and an outward force is applied, the diameter of this portion expands. After that, when a small diameter pipe is inserted into this part, not only the part expanded by the expanding claw but also the part where the outward force is applied by the compressed air is expanded or the diameter is expanded with only a small force. The small-diameter pipe to be inserted can be smoothly moved to a predetermined position with only a slight insertion force, and the large-diameter pipe can be inserted in close contact with the periphery of the small-diameter pipe by pulling out the expanding claws. The shape of the diameter expanding and air blowing device and the diameter expanding claw are not particularly limited as long as the diameter of the large diameter pipe can be expanded and the compressed air can be blown on the inner surface thereof as described above.

The large-diameter pipe is naturally hollow, but the small-diameter pipe may be not only hollow but also solid, that is, rod-shaped. The device of the present invention can be most suitably applied when a protective member such as an insulator is coated on the surface of a rubber tube, but can be used for other purposes. When a large-diameter pipe and a small-diameter pipe are inserted using the pipe insertion device according to the present invention, insertion can be performed even if the ends of both pipes are not aligned as in the conventional case, so that the conventional method can be used. Thus, the insertion tube in a good contact state can be obtained simply and reliably without manual operation, and as a result, the insertion can be automated and the work efficiency can be dramatically improved.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a pipe insertion apparatus according to the present invention. FIG. FIG. 1 is a schematic longitudinal sectional view showing one embodiment of a pipe insertion device according to the present invention.

The pipe insertion device 1 has a donut-shaped base 2 facing in the vertical direction, and preferably a total of four donuts fixed to the side surfaces of the base 2.
(Only three are shown in the figure) and an air blower 3. Each of the diameter-expanding and air-blowing devices 3 includes a compressed air chamber 4 formed between a wall surface cut out in a right-angled isosceles triangular shape and a side surface of the base 2 and a base 2 at an inner end thereof.
Has a diameter-enlarging claw 5 continuously provided so as to protrude in the opposite direction to
An air supply port 6 for blowing air in the compressed air chamber 4 in a direction opposite to the base 2 is formed inside the enlarged diameter claw 5. The diameter-enlarging claw 5 may be configured so that its relative position with respect to the base 2 does not change. However, it is preferable that the diameter-enlarging claw 5 be movable in the diameter direction of the base 2 or be connected to the base 2 with a degree of freedom.

FIGS. 2 to 5 are schematic longitudinal sectional views showing how to insert a large-diameter pipe and a small-diameter pipe using the apparatus shown in FIG. First, as shown in FIG. 2, the expanding claws 5 of the pipe insertion device 1 are engaged with one end of the large-diameter pipe 7, and the expanding claws 5 are together with the expanding and air blowing device 3 in the diametrical direction of the base 2 ( (Outward) to expand the end, expand the end of the large-diameter tube 7, and install a fastening ring 8 around the enlarged end of the large-diameter tube 7 to fix the large-diameter tube 7 to the enlarged claws 5. .

Next, as shown in FIG. 3, the air in the compressed air chamber 4 is blown inward from the enlarged portion of the large-diameter pipe 7 through the air supply port 6 of the enlarged diameter claw 5 as shown by an arrow. At the same time, a small-diameter pipe 9 having an outer diameter slightly larger than the inner diameter of the large-diameter pipe 7 is inserted from the enlarged-diameter portion of the large-diameter pipe 7 without contacting the enlarged-diameter claws 5. In this case, the compressed air from the air supply port 6 blows the compressed air to the portion of the inner surface of the large-diameter pipe 7 that is not in contact with the enlarged-diameter claw 5 on the other end side than the enlarged-diameter claw 5. Therefore, the portion of the large-diameter tube 7 that is not in contact with the enlarged-diameter claws 5 is expanded or easily expanded by a slight excessive force even when the diameter is not expanded.

Therefore, the small-diameter pipe 9 inserted into the large-diameter pipe 7
The small-diameter tube 9 can be easily inserted to a predetermined position with a small resistance to insertion not only at the end expanded by the diameter-enlarging claw 5 but also inside the end. In this state, the outer surface of the small-diameter tube 7 is in close contact with the inner surface of the large-diameter tube 7 except for the enlarged-diameter claws 6. Subsequently, when the outward force applied to the enlarged diameter claw 5 is released, the enlarged diameter claw 5 moves inward due to the elasticity of the large diameter tube 7, and as shown in FIG. Adhere to

When the ring 8 is removed from the state shown in FIG. 4 and the enlarged claw 5 is moved to the left side of the figure together with the base 2, the enlarged claw 5 is pulled out from between the large-diameter pipe 7 and the small-diameter pipe 9, and accordingly. As shown in FIG. 5, the enlarged end of the large-diameter tube 7 is brought into close contact with the outer surface of the end of the small-diameter tube 9, and the insertion of both tubes is completed. FIG.
5 shows the positional relationship between the small-diameter pipe 9 and the left end of the large-diameter pipe 7 so that the left end of the small-diameter pipe 9 coincides with the left end of the large-diameter pipe 7. Alternatively, it is not necessary that the both ends be located outside the large-diameter tube 7 and coincide with each other.

[0016]

According to the present invention, there are provided three or more expanding claws for engaging with one end of a large-diameter pipe to be inserted and enlarging the end, and air formed inside the expanding claws. An air supply port for spraying the inside of the enlarged diameter end to increase the enlarged diameter length, inserting a small diameter pipe into the large diameter pipe from the enlarged diameter end side to insert the inner surface of the enlarged claw and the inner surface of the large diameter tube Insertion means for bringing the small-diameter pipe into contact with the small-diameter pipe, and pull-out means for extracting the large-diameter claws from the contact portions of the large-diameter pipe and the small-diameter pipe, and inserting the large-diameter pipe in tight contact with the periphery of the small-diameter pipe. A tube insertion device (Claim 1) characterized by the following.

According to the apparatus of the present invention, in addition to the expansion of the end of the large-diameter tube by the expanding claw, the expansion of the portion inside the end by the blowing of compressed air is also possible. Insertion into a diameter pipe can be performed more smoothly. Moreover, since there is no need to align the ends of the large-diameter pipe and the small-diameter pipe to be inserted, the insertion operation is greatly simplified, and thus the entire process can be automated.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing one embodiment of a pipe insertion device according to the present invention.

FIG. 2 is a schematic longitudinal sectional view showing a first step of a series of steps for inserting a large-diameter pipe and a small-diameter pipe using the apparatus of FIG.

FIG. 3 is a schematic vertical sectional view showing a second step in the same manner.

FIG. 4 is a schematic longitudinal sectional view showing a third step.

FIG. 5 is a schematic vertical sectional view showing the fourth step.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pipe insertion apparatus 2 ... Base body 3 ... Diameter expansion and air sprayer 4 ... Compressed air chamber 5 ... Diameter expansion claw 6
... Air supply port 7 ... Large diameter pipe 8 ... Ring
9 ... Small diameter pipe

Claims (2)

(57) [Claims] At least three expanding claws for engaging the inside of one end of a large-diameter tube to be inserted and expanding the end of the large-diameter tube, and forming the air inside the expanding claws to expand the air. An air supply port for blowing inside the end, an insertion means for inserting a small-diameter pipe into the large-diameter pipe from the enlarged-diameter end side and bringing the small-diameter pipe into contact with the inner surface of the enlarged-diameter claw and the inner surface of the large-diameter pipe, And a pull-out means for pulling out the large-diameter claws from the contact portions of the large-diameter pipe and the small-diameter pipe, and inserting the large-diameter pipe in close contact with the small-diameter pipe. . 2. A large-diameter pipe to be inserted is engaged with three or more diameter-enlarging claws having an air supply port formed therein at one end thereof to expand the diameter of said one end part. A small-diameter tube is inserted into the large-diameter tube from the direction of the large-diameter portion while blowing air onto the large-diameter portion to bring the outer surface of the small-diameter tube into contact with the inner surface of the large-diameter claws and the inner surface of the large-diameter tube. And inserting the large-diameter claws from the contact portions of the large-diameter tube and the small-diameter tube, and inserting the large-diameter tube around the small-diameter tube in a tightly contacting state.