Machine for cutting nozzles of reactor vessels

Patent metadata

Field	Value
Publication number	US-11027348-B2
Application number	US-201816028404-A
Country	US
Kind code	B2
Filing date	Jul 5, 2018
Priority date	Aug 30, 2017
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

Disclosed herein is a machine for cutting nozzles of reactor vessels. The machine for cutting nozzles of reactor vessels comprises a cutting unit positioned at an upper surface edge of a reactor vessel having a nozzle and having a saw blade part having different contact areas to cut the nozzle, a drive unit providing the saw blade part with rotary power, and a foreign substance suction unit provided at one end of the cutting unit in contiguity with the saw blade part to suck foreign substances generated when the nozzle is cut by the saw blade part, wherein the foreign substance suction unit sucks the foreign substances by approaching an outer peripheral surface of the nozzle when the saw blade part moves in a cutting direction of the nozzle.

First claim

What is claimed is:

1. A machine for cutting nozzles of reactor vessels, the machine comprising:
a cutting unit positioned at an upper surface edge of a reactor vessel having a nozzle extending from a nozzle surface of the reactor vessel,
wherein the cutting unit includes a first frame supported on an upper surface of the reactor vessel, a second frame connected to the first frame and disposed beyond the nozzle surface in an axial direction, and a third frame coupled to the second frame and disposed beyond the second frame in the axial direction, and
wherein the third frame is configured to be movable with respect to the second frame in the cutting direction of the nozzle and includes an opening formed between a lower end of each of two opposing parts of the third frame, the opening configured to receive an insertion of the nozzle when the third frame moves toward the nozzle;
a drive unit providing a saw blade assembly with rotary power;
a first motor disposed outside a support bracket;
a rotary power converter receiving rotary power generated in the first motor to convert the rotary power into a rectilinear reciprocating motion;
a foreign substance suction unit provided at one end of the cutting unit in contiguity with the saw blade assembly to suck foreign substances generated when the nozzle is cut by the saw blade assembly, the foreign substance suction unit comprises a foreign substance suction pipe connected to the rotary power converter and moving toward the nozzle by forward or reverse rotation of the first motor;
an outer cover partially enclosing the foreign substance suction pipe; and
wherein the foreign substance suction unit sucks the foreign substances by approaching an outer peripheral surface of the nozzle when the saw blade assembly moves in a cutting direction of the nozzle,
wherein the foreign substance suction unit is connected through the support bracket disposed at the lower end of the third frame with respect to a front thereof.

2. The machine according to claim 1 , wherein the second frame is provided with a transfer cylinder for moving the third frame in a forward or backward direction to adjust a cutting length of the nozzle to an arbitrary position according to a protruding direction thereof.

3. The machine according to claim 1 , wherein the third frame is provided with a sensor for detecting a distance between the nozzle and the foreign substance suction unit.

4. The machine according to claim 1 , further comprising:
a first guide disposed in an inward longitudinal direction of the outer cover; and
a second guide disposed outside the foreign substance suction pipe and the second guide coupled to the first guide to move relative thereto.

5. The machine according to claim 1 , wherein:
the foreign substance suction pipe has a first suction region defined to be open upward of the nozzle by a predetermined length in a longitudinal direction of the foreign substance suction pipe from an end thereof extending toward the nozzle and a second suction region defined to be open at the end of the foreign substance suction pipe extending toward the nozzle;
the second suction region is open to suck foreign substances generated in a radial direction of the nozzle when the nozzle is cut by the saw blade assembly; and
the first suction region is open to suck foreign substances generated in the radial direction of the nozzle and in an upward direction of the foreign substance suction pipe when the nozzle is cut by the saw blade assembly.

6. The machine according to claim 1 , wherein the foreign substance suction pipe has left and right slopes, each being inclined at a predetermined angle outward from the front thereof, and foreign substances are guided inward by the slopes.

7. The machine according to claim 1 , wherein the foreign substance suction unit comprises a vacuum suction pipe disposed at one side of the third frame and connected to the foreign substance suction pipe to suck foreign substances by vacuum pressure.

8. The machine according to claim 1 ,
wherein the saw blade assembly is disposed in the front of the third frame, and
wherein the first saw blade is a band saw and the second saw blade is a wire saw.

9. The machine according to claim 8 , further comprising:
a first pulley positioned at a front upper side of the third frame and axially coupled to a rotary shaft formed in the drive unit, the first saw blade being wound around the first pulley;
second pulleys spaced downward from the first pulley and positioned to the two parts of the third frame to face each other, the first saw blade passing through the first pulley being wound around the second pulleys;
third pulleys disposed between the first and second pulleys and spaced downward from the first pulley to face each other, the second saw blade being wound around the third pulleys;
fourth pulleys positioned above the third pulleys and spaced apart from each other to face each other, the second saw blade passing through the third pulleys being wound around the fourth pulleys; and
fifth pulleys positioned coaxially to the second pulleys, the second saw blade passing through the fourth pulley being wound around the fifth pulleys.

10. The machine according to claim 9 , wherein the third frame comprises:
a first guide slot that is open vertically by a predetermined length with respect to an insertion position of the first pulley; and
second guide slots, each of which is open vertically by a predetermined length with respect to an insertion position of an associated one of the fourth pulleys.

11. The machine according to claim 10 , further comprising:
a first support block axially coupled to each of the fifth pulleys in the third frame;
a first slide rail coupled to the first support block and extending in a vertical direction of the third frame; and
a first cylinder coupled to one side of the first support block and moving the first support block along the first slide rail to move the second saw blade in a longitudinal upward or downward direction of the third frame.

12. The machine according to claim 11 , wherein the first cylinder moves the fifth pulley along the first slide rail in an upward direction of the third frame when it is necessary to cut the nozzle with the first saw blade, and wherein the first cylinder moves the fifth pulley along the first slide rail in the downward direction of the third frame when it is necessary to cut the nozzle by the second saw blade.

13. The machine according to claim 9 , wherein the third frame is equipped with a tension adjustment unit for adjusting tension of the second saw blade, and the tension adjustment unit comprises:
a second support block axially coupled to each of the fourth pulleys;
a second slide rail coupled to the second support block and extending in a vertical direction of the third frame; and
a first tension adjustment cylinder coupled to one side of the second support block and the first tension adjustment cylinder moving the second support block along the second slide rail according to the tension of the second saw blade.

14. The machine according to claim 13 , wherein the first tension adjustment cylinder adjusts tension in response to a signal transmitted from a tension sensor for detecting the tension of the second saw blade.

15. The machine according to claim 1 , further comprising a vacuum pump unit for providing the foreign substance suction unit with vacuum pressure.

16. The machine according to claim 1 , further comprising:
third guide rails spaced apart from each other in a longitudinal direction of the base side of the

Assignees

• Doosan Heavy Ind & Construction Co Ltd
• Doosan Heavy Ind Constr Co Ltd

Inventors

• Park Kwang Soo
• Kim Hae Woong

Classifications

• Y02E30/30

  Nuclear fission reactors · CPC title

• B23D57/0069

  of devices for tensioning saw wires · CPC title

• B23D53/003

  with means to attach the sawing device to the workpiece · CPC title

• B23D57/0084

  specially adapted for sawing under water or at places accessible with difficulty · CPC title

• G21D1/003

  Nuclear facilities decommissioning arrangements (decontamination arrangements, treating radioactively contaminated material G21F9/00) · CPC title