JP2587620Y2 - Pipe branch perforator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hot-water transport pipe in which a hot fluid flows in a pipe, such as a hot-water transport pipe or a steam transport pipe of a district heating system. This is a pipe branching drilling device used for performing drilling. More specifically, a branch pipe is connected to an outer peripheral surface of a portion corresponding to the drilling of a thermal fluid transport pipe, and the pipe extends along a pipe axis direction in the branch pipe. wherein the tip of the freely rotated shaft withdrawal movement
A branch hole is formed in the pipe wall of the thermal fluid transport pipe surrounded by the branch pipe
A pipe branch in which a casing of a drilling machine having a drilling cutter mounted thereon and having a bearing portion provided between the drive rotary shaft and the casing is detachably fixedly connected to a distal end portion of the branch pipe. The present invention relates to a punching device for use.

[0002]

2. Description of the Related Art In a conventional pipe branching drilling device, a heat fluid
Perpendicular to the pipe axis of the thermal fluid transport pipe
In this state, connect the branch pipes by appropriate means such as welding, and
At the end of the branched pipe, the casing of the drilling machine is airtight or
It was directly fixedly connected in a liquid-tight state (for example,
See Japanese Unexamined Patent Publication No. 311209).

[0003]

In this type of pipe branching drilling device, the drilling device is mounted on the tip of the driving rotary shaft while drivingly rotating the driving rotary shaft of the drilling machine fixedly connected to the distal end of the branch pipe. The drilling cutter is moved at a predetermined cutting speed to the heat fluid transport pipe side along the pipe axis direction in the branch pipe to form a branch hole in the pipe wall of the heat fluid transport pipe surrounded by the branch pipe. And when a little hole is made in the pipe wall of the fluid transport pipe,
The thermal fluid in the thermal fluid transport pipe flows into the branch pipe, and the drilling cutter and the driving rotary shaft of the drilling machine are exposed to the thermal fluid flowing in. Therefore, when the heat fluid transport pipe is, for example, a hot water transport pipe or a steam transport pipe of a district heating system, the drilling cutter and the driving rotary shaft of the drilling machine flow into the branch pipe from the hot fluid transport pipe. Hot water (for example, 7
(0 ° C. to 80 ° C.) or steam (e.g., 200 ° C.), and if the drilling operation continues for a long time in this state, the drive rotary shaft expands in diameter due to thermal expansion, and as a result, the drive rotary shaft becomes When pressed against the bearing, not only does the driving load of the drilling machine increase, but also there is a possibility that the driving rotary shaft will seize and become unable to rotate. The present invention has been made in view of the above-described circumstances, and its purpose is to reduce the size of the drilling device in the axial direction and to reduce the size of the drilling device at a position corresponding to the bearing portion of the drive rotary shaft associated with the drilling operation. By suppressing the thermal expansion, the intended drilling operation can be performed well without increasing the driving load , and the cooling structure for that purpose is devised.
This makes it possible to create branch holes in fluid transport pipes that do not require cooling.
When forming, change in length of branch pipe connected to fluid transport pipe
The permissible range for drilling, making drilling easier and more efficient
Lies in the fact that in so that it is possible to accelerate the reduction.

[0004]

In order to achieve the above object, according to the present invention, a branch pipe is connected to an outer peripheral surface of a portion corresponding to a perforation of a thermal fluid transport pipe, and the branch pipe is provided along a pipe axis in the branch pipe. The branch pipe at the tip of the drive shaft
A casing of a drilling machine equipped with a drilling cutter for forming a branch hole in the pipe wall of the surrounded heat fluid transport pipe , and having a bearing between the drive rotary shaft and the casing,
What is claimed is: 1. A pipe branching drilling device which is detachably fixedly connected to a distal end of the branch pipe in an airtight or liquid tight state , wherein a cooling medium is present between the distal end of the branch pipe and a casing of the drilling machine. Air-tight or liquid-tight housing that forms a cooling chamber
In addition to being fixedly connected detachably , the heat-dissipating member provided with the heat-dissipating fins on the shaft portion of the driving rotary shaft of the drilling machine, which is located in the cooling chamber, is relatively movable in the axial direction in the heat conduction state. It is characterized by being fitted externally, and the operation and effect of the feature are as follows.

[0005]

The heat fluid flowing into the branch pipe from the heat fluid transport pipe during the drilling operation of the heat fluid transport pipe causes the heat fluid to flow into the branch pipe.
Drilling cutter of the drilling machine located and the tip of the driving rotary shaft
Even if the temperature of the side part rises, the cold connection fixedly connected in airtight or liquid tight state between the tip of the branch pipe and the casing of the drilling machine
The drive rotating shaft can be cooled by the cooling medium existing in the cooling chamber of the housing for cooling . In addition, since the heat dissipating member provided with the heat dissipating fins is fitted on the shaft portion located in the cooling chamber so as to be relatively movable in a heat conducting state, the contact area between the heat dissipating fins and the cooling medium is efficiently increased. The cooling chamber can be cooled, and, for example, as in the case where the heat radiating member is fixed to the driving rotary shaft, the axial direction length of the cooling chamber is defined by the operating stroke of the driving rotary shaft and the axial direction length of the heat radiating member. It is not necessary to make the length approximately equivalent to the sum. In other words, the length of the cooling housing in the axial direction can be made shorter than when the heat radiation member is fixed to the driving rotary shaft. Furthermore, cooling such as water pipes and sewer pipes
Where a branch hole is formed in the pipe wall of a fluid transport pipe that does not require
In this case, the cooling housing is connected to the tip of the branch pipe and the drilling machine.
By removing from the space between the casing and the casing,
The length corresponding to the axial length of the body is
It is possible to increase the feed amount of the driving rotary shaft.

[0006]

Therefore, the temperature rise of the driving rotary shaft caused by the drilling of the thermal fluid transport pipe can be prevented by the air-tight or liquid-tight cooling connection between the tip of the branch pipe and the casing of the drilling machine.
The cooling can be efficiently performed in the cooling chamber of the cooling housing, so that an increase in drive load and seizure of the drive rotation shaft due to thermal expansion at the bearing portion of the drive rotation shaft can be suppressed. Can be satisfactorily performed. Moreover, it is possible to reduce the size of the entire drilling device in the axial direction as compared with the case where the heat radiation member is fixed to the driving rotary shaft.
And the cooling housing is configured to be detachable.
Fluid transfer that does not require cooling with only simple modifications
When forming a branch hole in the feed pipe, the part connected to the fluid transport pipe
The tolerance for variations in manifold length has increased,
Only, it is easy to facilitate the perforation work and promote efficiency .

[0007]

1 to 4 show a pipe branching perforation apparatus, which is an outer peripheral surface of a hot fluid transport pipe 1 through which a hot fluid such as hot water or steam flows. The branch pipe 2 is connected in a posture orthogonal to the pipe axis X of the thermal fluid transport pipe 1 and the drive rotary shaft 3 is movable along the pipe axis Y in the branch pipe 2. The thermal fluid transport pipe 1 surrounded by the branch pipe 2 at the tip of
A drilling machine in which a drilling cutter 4 for forming a branch hole is detachably mounted on the pipe wall of the above, and an air-tight or liquid-tight bearing portion 6 is provided between the drive rotary shaft 3 and the casing 5. The casing 5 of A is fixedly connected to the distal end of the branch pipe 2 in a gas-tight or liquid-tight manner so as to be detachable. The branch pipe 2 is connected to a first branch pipe 2A welded to the thermal fluid transport pipe 1 and a connection flange 2a of the first branch pipe 2A via a bolt 10 and a nut 11 in an airtight state or a liquid state. And a second branch pipe 2B having a connection flange 2b fixedly connected in a dense state. The drill 4 includes a center drill 4A and a cylindrical cutter 4B.
It is composed of As shown in FIGS. 1, 5, and 6, a cooling chamber 7 in which cooling water (an example of a cooling medium) flows is formed between the tip of the branch pipe 2 and the casing 5 of the drilling machine A. In addition, a cylindrical heat dissipating member 8 having a plurality of heat dissipating fins 8a on its outer peripheral surface is provided on a shaft portion of the driving rotary shaft 3 of the drilling machine A, which is located inside the cooling chamber 7.
Are externally fitted and held so as to be relatively movable in the axial direction in a heat conductive state. The cooling chamber 7 is connected to the connecting flange 2c on the distal end side of the second branch pipe 2B via a bolt 10 in a gas-tight or liquid-tight state so as to be detachably fixedly connected thereto.
a, and a connecting flange 9b which is detachably fixedly connected to the connecting flange 5a of the casing 5 of the drilling machine A via a bolt 10 and a nut 11 in an air-tight state or a liquid-tight state.
The cooling pipe 9, which is a cooling housing, is connected to the second branch pipe 2B.
And the casing 5 is fixedly connected. Further, a water supply pipe 9A and a drain pipe 9B are welded to the cooling pipe 9 in a state of communicating with the cooling chamber 7, and each of these connecting pipes 9A and 9B is connected to the cooling chamber 7. It is connected to a cooling water supply mechanism B that supplies cooling water. The cooling water supply mechanism B may be configured using a water pipe provided at or near a construction site. In this case, tap water at normal temperature (for example, 20 ° C. to 30 ° C.) is used as cooling water. When cooling water having a temperature lower than that of tap water is required, the cooling water supply mechanism B is provided with a tank for storing the water discharged from the drain pipe 9B and a storage water in the tank. A cooling device that cools to a temperature (for example, 2 ° C. to 4 ° C.), a pump that supplies the cooled cooling water to the water supply pipe 9B, and the like, and circulates and supplies the cooling water to the cooling chamber 7. It may be configured as follows. The heat dissipating member 8 is a heat dissipating member made of copper or aluminum alloy in which one portion in the circumferential direction is separated along the axial direction, and a pair of connecting flanges 8B are bent along the separated portion. On the outer surface of the cylindrical body 8A,
A large number of rod-shaped heat radiation fins 8a made of copper or aluminum alloy are welded. Further, of the plurality of bolt insertion holes 8b formed in the pair of connection flanges 8B, the bolt insertion holes 8b opposed in the circumferential direction are provided.
The bolt 8C is inserted through each of the bolts 8C, and the nut 8E is inserted into the male screw portion of each of the bolts 8C with the compression coil spring 8D interposed between it and one of the connecting flanges 8B.
Is screwed. Then, by adjusting the tightening force of the nuts 8E, the inner peripheral surface of the heat-dissipating cylindrical body 8A is adjusted in a state where relative sliding of the heat-dissipating cylindrical body 8A and the drive rotary shaft 3 in the axial direction is allowed. Heat is exchanged between the drive rotary shaft 3 and the heat dissipating cylindrical body 8A by bringing the drive rotary shaft 3 into close contact with the outer peripheral surface of the drive rotary shaft 3. Further, since the heat dissipating cylindrical body 8A is elastically deformable in the radially expanding direction (diameter outward) within the elastic contraction range of the compression coil spring 8D, the nut 8E is formed.
Does not hinder the drive rotation of the drive rotary shaft 3 and the movement in the axial direction when drilling. Next, the punch A will be described.
The drive rotary shaft 3 rotatably supported by the casing 5
Inside the front end of the drive rotary shaft 3 (the side where the branch pipe 2 exists)
First feed shaft 12 connected only to relative rotation with respect to
And a second feed shaft 13 having a female screw 13a screwed into a male screw 12a formed on the outer peripheral surface of the rear end portion of the first feed shaft 12 (the side opposite to the side where the branch pipe 2 exists). And a manual handle 14 is fixed to a rear end of the second feed shaft 13 protruding from the casing 5. Further, a drive cylinder shaft 15 spline-fitted to the outer surface of the rear end portion of the drive rotation shaft 3 so as to be slidable in the axial direction so as to be freely slidably supported on the casing 5 via a bearing 16. , This drive cylinder shaft 1
A worm wheel 19 meshing with a worm 18 of a drive input shaft 17 interlocked with an electric motor or an engine (not shown) is fixed near the front end of the drive gear 5, and the drive A first transmission shaft 20 rotatable about an axis parallel to the rotation shaft 3, and a first transmission shaft 2
Second transmission shaft 2 rotatable about an axis orthogonal to zero
1, and an operation shaft 22 that is slidably movable within a certain range in an axial direction parallel to the drive rotation shaft 3. A third spur gear 25 that meshes with and interlocks with a first spur gear 23 fixed near the rear end of the second feed shaft 13 via a second spur gear 24 is fixed to the first transmission shaft 20.
A second bevel gear 27 that meshes with a first bevel gear 26 fixed to the second transmission shaft 21 is loosely fitted to the first transmission shaft 20. Also, of the first transmission shaft 20,
The shaft portion located between the third spur gear 25 and the second bevel gear 27 is switched between an automatic feed state meshing with the second bevel gear 27 and a manual feed state disengaged from the second bevel gear 27. A free dog clutch 28 is externally slidably movable in the axial direction, and a shift fork 29 and an operation knob 30 that are engaged with the dog clutch 28 are attached to the operation shaft 22. A second staggered gear 32 that meshes with and interlocks with a first staggered gear 31 fixed to the rear end of the drive cylinder shaft 15 is fixed to the second transmission shaft 21, and a front end of the first transmission shaft 20. Is connected to a tachometer 33 for measuring the number of revolutions for calculating the feed amount. When an electric motor or engine (not shown) is driven, the worm 18 and the worm wheel 19
The driving cylinder shaft 15 is driven and rotated via the shaft, and the drilling cutter 4 is further driven and rotated via the driving rotating shaft 3 which is spline-fitted to the driving cylinder shaft 15. At the same time, the first staggered gear 31, the second staggered gear 32, the second transmission shaft 21, the first bevel gear 26, the second bevel gear 27, and the dog clutch 28 in the automatic feed state from the drive cylinder shaft 15. Power is transmitted to the first transmission shaft 20 via the first transmission shaft 20, and is further transmitted from the first transmission shaft 20 to the second feed shaft 13 via the third spur gear 25, the second spur gear 24, and the first spur gear 23. Is transmitted.
When the second feed shaft 13 is driven to rotate, the first feed shaft 12 screwed with the second feed shaft 13 slides to the projecting side, and the cutter 4 for drilling is driven via the drive rotary shaft 3 that moves integrally with the first feed shaft 12 in the axial direction. It is sent to the thermal fluid transport pipe 1 at a predetermined cutting feed speed. In the case of manual operation in an emergency, the operation knob 30 is pushed in to switch the dog clutch 28 from the automatic feed state to the manual feed state. Thereafter, when the manual handle 14 is rotated, the first feed shaft 12 slides in the axial direction along with the rotation of the second feed shaft 13, and the drilling cutter 4 is moved via the drive rotary shaft 3 into the branch pipe 2.
Move back and forth along the pipe axis. The bearing 6 is shown in FIG.
As shown in the figure, in the opening on the front end side of the casing 5,
A cylindrical bush 6A that is in sliding contact with the outer peripheral surface of the rotary drive shaft 3 is fastened and fixed with a bolt 34, and at two locations on the inner peripheral surface of the bush 6A and at predetermined intervals in the axial direction thereof. A lip packing 6B and an O-ring 6C are attached to the formed annular groove.

[Second Embodiment] FIG. 7 shows another embodiment of the heat dissipating member 8 and the rotary drive shaft 3
Each of the annular grooves 8f formed on the inner peripheral surface of the heat radiation cylindrical body 8F having an inner diameter slightly larger than the outer diameter of O-ring 8 slidably adheres in a liquid-tight manner to the surface in the axial direction
G, the inner peripheral surface of the heat dissipating cylindrical body 8F and the rotating drive shaft 3
An annular sealed space S is formed with the outer peripheral surface of the radiating fin 8a.
And a nipple 8 for injecting a heat transport medium (for example, diesel oil) having excellent thermal conductivity into the sealed space S.
H, and further, on the inner peripheral surface of the heat radiation cylindrical body 8F,
Many heat absorbing fins 8J are fixed. In the case of this embodiment, heat is conducted from the rotary drive shaft 3 to the radiating fins 8a of the radiating cylinder 8F via the heat transport medium in the sealed space S and the O-ring 8G. Third Embodiment FIG. 8 shows that a coil-shaped evaporator 41 of a refrigerator 40 is attached to a cooling pipe 9 constituting the cooling chamber 7,
1 is configured to cool a heat transport medium such as water sealed in the cooling chamber 7. Further, in the case of this embodiment, the refrigerator 40 is driven and controlled based on the detection signal of the temperature sensor 42 attached to the cooling pipe 9 so that the heat transport medium in the cooling chamber 7 becomes the set temperature. You. [Other Embodiments] In the above-described embodiment, tap water or cooling water is supplied to the cooling chamber 7. However, refrigerant liquid other than tap water or cooling water is caused to flow directly into the cooling chamber 7. It may be configured and implemented. The shape of the heat dissipating member 8 may be a cylindrical shape that can be slidably fitted to the rotary drive shaft 3 from the axial direction, or a pair of semi-cylindrical members each having a half-cylindrical body. The two semi-cylindrical bodies may be connected to each other with bolts and nuts or the like in a state of being fitted to the drive rotating shaft 3 outside. In short, the heat dissipating member 8 may have any shape as long as the heat dissipating member 8 can be fitted to the drive rotary shaft 3 in a heat conductive state so as to be relatively movable in the axial direction. The shape of the radiating fins 8a is not limited to a pin-like or plate-like shape, but may be a ring-like or spiral-like structure.

In the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of the entire pipe branching perforation apparatus showing a first embodiment.

FIG. 2 is an enlarged sectional side view of the front part of the drilling machine.

FIG. 3 is an enlarged sectional side view of the rear part of the drilling machine.

FIG. 4 is an enlarged sectional rear view of the rear part of the drilling machine.

FIG. 5 is a central sectional view of FIG. 6;

FIG. 6 is a half sectional side view of a heat radiation member.

FIG. 7 is a sectional side view of a cooling unit according to a second embodiment.

FIG. 8 is a sectional side view of a cooling unit according to a third embodiment.

[Explanation of symbols]

Reference Signs List A drilling machine 1 thermal fluid transport pipe 2 branch pipe 3 drive rotating shaft 4 drilling cutter 5 casing 6 bearing unit 7 cooling chamber 8 heat radiating member 8a heat radiating fin 9 cooling housing

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23B 41/08 F16L 41/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A drive that connects a branch pipe (2) to an outer peripheral surface of a portion corresponding to a perforation of a thermal fluid transport pipe (1) and that can move back and forth along a pipe axis in the branch pipe (2). Heat fluid transfer surrounded by the branch pipe (2) at the tip of the rotating shaft (3)
A pipe cutter (4) for forming a branch hole is mounted on the pipe wall of the feed pipe (1) , and a bearing (6) is provided between the drive rotary shaft (3) and the casing (5). A pipe branching drilling device in which the casing (5) of a drilling machine (A) is detachably fixedly connected to a tip end of the branch pipe (2) in an airtight or liquid tight state , wherein the branch pipe is provided. A cooling chamber (7) in which a cooling medium exists is formed between the tip of (2) and the casing (5) of the drilling machine (A).
The cooling casing (9) to be formed can be detached in an airtight or liquid tight state.
And a heat radiating member (8) provided with a heat radiating fin (8a) on a shaft portion of the driving rotary shaft (3) of the drilling machine (A) located in the cooling chamber (7). A pipe branching drilling device which is fitted externally so as to be relatively movable in the axial direction in a heat conducting state.