JP2502780Y2 - Pipe drawing tool, air hammer for pipe drawing - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe drawing tool and an air hammer for pipe drawing, and more particularly to removing a cooling water pipe of a condenser of a thermal power plant from a side plate.

[0002]

2. Description of the Related Art There is a condenser as a facility for cooling steam worked by a steam turbine of a thermal power plant. In this condenser, many thin cooling water pipes are provided between side plates. The cooling water pipe is specified in JIS as a copper alloy for condensers, but the outer diameter of the pipe is usually 19mm / 20mm / 25mm, and the wall thickness is
It is 1.0 or 1.2 mm. Brass plates are used for the side plates on both sides, and the ends of the cooling water pipes are fitted into the side plates and then expanded and fixed to the side plates.

[0003]

[Problem to be solved by the present invention] There is construction to replace the cooling water pipe of the condenser due to aging. The frequency of replacement and the number of replacements vary, but replacement work in units of 1,000 units is required depending on the year. All the work of replacing the thin cooling water pipes is done manually without using power tools. Among these manual operations, it is necessary to rationalize the operation by using a power tool for a throttle that radially separates the cooling water pipe from the side plate and a drawing operation for axially separating the cooling water pipe from the side plate.

[0004]

In view of the above-mentioned circumstances, the present invention, in view of the above circumstances, squeezes the cooling water pipe from the side plate in the radial direction by installing the pipe between the side plates of the container-like equipment and expanding the pipe end. This is a pipe drawing tool that draws the tube end of the fixed tube inward and separates the tube from the side plate.The tip of the chisel made of a material with the same hardness as the side plate is a rod-shaped body with the same diameter as the tube end of the tube. Triangular cross section with three claws protruding in the axial direction at the position where the circumference is divided into three equal parts, the outer circumference of the claws is linear and has a pointed spear shape along the cylindrical surface, and the inside is about 76 ° to the center Then, the central axis side is gradually tapered, and the shank is inserted into the concave connection hole on the base end side of the chisel to connect, and the adjustment screw is screwed in the center axis direction at the base end center of the pawl. It is a pipe drawing tool.

In order to mount the pipe drawing tool on the power tool, a cylindrical holder with a bottom is screwed onto the tip of the cylinder, and the pipe drawing tool is accommodated and installed through a window hole formed in the holder side wall. A pipe throttle with a leveling ring, an air adjustment valve and a start / stop valve that protrudes the chisel of the pipe throttle tool from the communication hole provided in the bottom of the holder, and a buffer ring is attached to the valve mounting seat that reciprocates the piston inside the air hammer. It is an air hammer for.

[0006]

The function of the pipe drawing tool of the present invention is that the pipe can be drawn easily with the chisel having three protruding claws, so that the pipe can be drawn easily and the length of the pipe can be adjusted with the adjusting bolt. Since it has almost the same hardness as the side plate, it does not damage the side plate. Further, according to the present invention, the holder is screwed to the tip of the cylinder to mount the pipe drawing tool, and the level, the air amount adjusting valve, and the start / stop valve are provided, so that the pipe drawing tool can be easily mounted. Easy to squeeze the pipe.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to specific embodiments of the accompanying drawings. A thin cooling water pipe is installed between the side plates of the condenser, and the pipe end is expanded to fix the pipe to the side wall. With the pipe drawing tool of the present invention, the cooling water pipe 1 is drawn down from the cross section shown in FIG. 1 to the cross section shown in FIG.

The pipe drawing tool includes a chisel 2, a shank 3 which is fitted and connected to the base end of the chisel 2, an adjusting screw 5 screwed to the center of the bases of three claws 4 of the chisel 2, and an adjusting screw. 5
It is composed of a loosening prevention pin 6. The chisel 2 is a rod-shaped body made of bronze having the same hardness so as not to scratch the soft brass side plate. The tip end of the chisel 2 has three claws 4 projecting in the axial direction at a position where the circumference is divided into three equal parts in order to narrow the base end of the tube 1 inward. In order to gradually narrow the pipe end of the pipe 1 with the claw 4, the outer periphery of the claw 4 has a linear, pointed spear shape along the cylindrical surface, and the inside has a triangular cross section about 76 ° to the center. The claws 4 are formed such that the central axis side is deleted and gradually becomes thinner from the base end of the central axis toward the tip. The inner surface shape of the claw 4 for narrowing down the tube 1 is such that the curve sharply changes at the tip so that the tube can be narrowed down at once, and then gradually changes on the base end side.

Since the shank 3 is struck by a piston, it is made of hardened hardened steel and is fixedly connected to a connecting hole formed in the base end of the chisel 2. An adjusting screw 5 is screwed in the central axis direction around the base ends of the three claws 4 of the chisel 2 so that the narrowed length of the pipe end of the pipe 1 can be adjusted. Since the adjustment screw 5 is loosened due to the impact of the piston applied to this pipe drawing tool, the loosening prevention pin 6 is screwed to the side portion of the chisel 2 to press the adjustment screw 5 at its tip.

In order to narrow down the pipe end of the pipe 1 fixed to the side plate with this pipe drawing tool, the tip of the chisel 2 is applied to the pipe end face of the pipe 1 and the air hammer is operated, so that the piston causes the base end face of the shank 3 to move. It is repeatedly hit and the pipe end of the pipe 1 is narrowed. The pipe end of the pipe 1 is gradually narrowed and approaches the end surface of the adjusting screw 5, but the operation of the air hammer is stopped after the narrowed pipe end surface of the pipe 1 is brought into contact with the end surface of the adjusting screw 5.

Next, the pipe hammer air hammer will be described with reference to FIGS. A bottomed cylindrical holder 12 is screwed onto the tip of the cylinder 11 of the air hammer. The pipe drawing tool is accommodated and installed through the window hole 13 formed in the side wall of the holder 12, and the chisel 2 of the pipe drawing tool is projected from the insertion hole 14 provided at the bottom of the holder 12. A level 10 is provided on the upper surface of the cylinder 11, and a valve 16 for turning on / off the inflow of air is provided in the grip 15 of the air hammer.
There is a regulator 17 below the valve 16 for controlling the air amount, and an air hose is connected below the regulator 17.

A bush 21 is fitted and fixed to the tip of the cylinder 11, and guides the pipe drawing tool when it receives an impact due to the reciprocating motion of the piston 22 sliding inside. Reference numeral 23 is a hanging metal fitting. When the pipe drawing tool is attached to the tip of the air hammer, since the flange 24 cannot be passed from the front end side, the flange 24 cannot pass from the front end side because the flange 24 is located in the middle portion, and the pipe drawing tool is inserted from the side wall window hole 13 and attached. In the past, since there was no holder 12, there was a possibility that the pipe drawing tool would fall out when it was used by inserting it from the tip side, but according to the present invention, the holder 12 is screwed, so even if it comes out, the flange 24
There is no possibility that the will come in contact with the bottom wall of the holder 12 and fall out. Further, since the bush 21 guides the shank 3, it can be slid correctly.

Further, since the air hammer is provided with the spirit level 10, it is possible to perform the narrowing down work while maintaining the horizontal level, so that the work can be performed accurately. Moreover, since the regulator 17 for adjusting the amount of air is provided, the pipe drawing tool can be operated according to the situation where the pipe is stuck to the side wall while changing the striking force.

The throttle air hammer can be used as an extrusion air hammer by exchanging attachment parts.

[0015]

As described above, the present invention is a pipe squeezing device in which a pipe is installed between side plates of a container-shaped device, the pipe end is expanded and fixed, and the pipe end is squeezed inward to separate the pipe from the side plate. The tool is a rod-shaped body having the same diameter as the tube end of the tube, and the tip of the chisel made of a material having substantially the same hardness as the side plate is provided with three claws projecting in the axial direction at a position where the circumference is divided into three equal parts. The outer circumference of the claw is linear and has a pointed spear shape along the cylindrical surface, and the inside has a triangular cross section with about 76 ° to the center, and the central axis side is gradually tapered and formed on the base end side of the chisel. This is a pipe drawing tool in which a shank is fixedly connected to a recessed connection hole and an adjusting screw is screwed in the center axis direction at the center of the base end of the claw, so it is ideal as a drawing tool that separates the pipe from the side plate in the radial direction. is there.

Further, according to the present invention, a cylindrical holder having a bottom is screwed to the tip of the cylinder, a pipe drawing tool is accommodated and mounted through a window hole formed in the holder side wall, and a pipe drawing is provided through an insertion hole provided at the bottom of the holder. It is a pipe drawing air hammer that has a leveling hole and a regulator with the chisel of the tool protruding, and a buffer ring is attached to the valve mounting seat that reciprocates the piston inside the air hammer, so the pipe drawing process can be performed with power. it can.

Table 1 shows a comparison of the time required for pressing a single cooling pipe, which is a pre-process of the cooling pipe drawing work, and pushing in with the conventional work.

[0018]

[Table 1]

That is, the working time for drawing and extrusion is reduced to about one tenth, and the working time is greatly shortened. As mentioned above,
According to the present invention, when a cooling pipe throttling tool is used in the cooling pipe replacement work, the cooling pipe throttling work can be performed without damaging the tube plate of the condenser and regardless of the skill of the worker. It can be done in a short time.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view before narrowing a tube.

FIG. 2 is a vertical cross-sectional view after the tube is narrowed down.

FIG. 3 is a front view of a pipe drawing tool.

FIG. 4 is a left side view of the pipe drawing tool of FIG.

FIG. 5 is a vertical cross-sectional view of a pipe throttle air hammer.

FIG. 6 is a bottom view of FIG.

FIG. 7 is a vertical sectional view of a pipe drawing tool.

FIG. 8 is a right side view of FIG.

[Explanation of symbols]

 1 ... Tube 2 ... Chisel 4 ... Claw 7 ... Connection Hole 3 ... Shank 5 ... Adjusting Screw 11 ... Cylinder 12 ... Holder 13 ... Window Hole 14 ... Insertion Hole 10 ... Level 15 ... Grip 17 ... Regulator

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Junichiro Hidaka Inventor Junichiro Hidaka 2-18-1, Shibata, Kita-ku, Osaka Sugino Machine Co., Ltd. Osaka Sales Office (56) Reference JP-A-55-60184 (JP, A) Actual Kaihei 2-139035 (JP, U) Actual public Sho 55-15979 (JP, Y2)

Claims (2)

(57) [Scope of utility model registration request] 1. A pipe squeezing tool for squeezing the pipe end of a pipe fixed between the side plates of a container-shaped device by expanding the pipe end and fixing the pipe end away from the side plate. With a rod-shaped body having the same diameter as the side plate, the tip of the chisel made of a material having almost the same hardness as the side plate is provided with three claws protruding in the axial direction at a position where the circumference is divided into three equal parts.
The outer circumference of the claw is a straight pointed spear shape along the cylindrical surface and the inside has a triangular cross section with about 76 ° to the center, the central axis side is gradually tapered, and it is formed on the base end side of the chisel. A pipe drawing tool in which a shank is inserted into a recessed connection hole to connect and a adjusting screw is screwed in the center axis direction at the base end center of the claw. 2. A bottomed cylindrical holder is screwed to the tip of the cylinder, and the pipe drawing tool according to claim 1 is accommodated and mounted through a window hole formed in the side wall of the holder, and an insertion hole provided in the bottom of the holder. An air hammer for pipe throttling that has a leveling ring and a regulator that project the chisel of the pipe throttling tool from, and that has a shock absorber ring attached to the valve mounting seat that reciprocates the piston inside the air hammer.