KR101945455B1 - System for cutting drum - Google Patents

Abstract

The present invention relates to a drum cutting system, and more particularly, to a drum cutting system configured to cut and separate a lower face rim of a drum for effective decontamination of the drum. A drum cutting system according to the present invention includes: a fixing unit for fixing a drum; A rotating part for rotating the fixing part; And a cutting portion formed at one side of the fixing portion and for cutting the drum.

Description

[0001] SYSTEM FOR CUTTING DRUM [0002]

The present invention relates to a drum cutting system, and more particularly, to a drum cutting system configured to cut and separate a lower face rim of a drum for effective decontamination of the drum.

Generally, radioactive waste is an unnecessary radioactive material generated during the process of using nuclear energy in a nuclear power plant or the like, and it is a kind of radioactive material that is used in a nuclear power plant, a workplace dealing with radioactive materials or various wastes from a laboratory such as waste water, fission products, , Including drums used for temporary collection of cesium-contaminated soil caused by nuclear accidents in Japan. The disposal of wastes and waste drums in nuclear power plants and nuclear material processing facilities is a very serious problem.

Normally, radioactive waste generated by business activities at research institutes or general industrial radioactive material generating facilities according to normal operation of radioactive waste repository is packed and stored in a 200 liter drum (55 gallon capacity, hereinafter referred to as "200 liter drum") This leads to the repository. In this process, packaged waste must be immobilized or solidified in order to be handled in accordance with delivery conditions of the repository, and in the process of repacking the radioactive waste inside the 200 liter drum, a waste drum which is not suitable for disposal occurs, , Dispose of it by self disposal, crush the drum, press it, and repack it in a 380 liter drum (85 gallon capacity) and dispose of it. Here, decontamination refers to a series of actions or operations that reduce the radioactivity of radioactive contaminated material.

Repackaging and disposing of shredded drums is the best way to dispose of them because it can lead to serious consequences of national loss and repository storage capacity prematurely exhausted due to the disposal of important metal resources. On the other hand, steel drums having a capacity of 200 liters are generally used for packing and storing radioactive waste. Also, for example, to dispose of the radioactive waste stored in a 200 liter drum, a 200 liter capacity drum may be ultra-high pressure compressed and repackaged using a 380 liter (85 gallon) drum.

Here, the drum having a capacity of 200 liters varies in material and thickness according to the purpose of use. However, drums mainly used as radioactive waste disposal drums are mostly used DOT-17H drums conforming to the standard of transportability in the United States.

Such a drum 2 is shown in Fig. The drum 2 is a steel drum having a thickness of approximately 1.5 mm and three rows of embossings 4 are formed on the side of the drum 2 in order to ensure the compressive strength of the drum 2 and to prevent side deformation . Figure 1 shows a drum 2 with three rows of embossings 4, although some of the drums may include two rows of embossing.

As shown in the enlarged view of the portion A of Fig. 1 shown in Fig. 2, in order to maintain the airtightness of the drum and prevent deformation, the drum 2 has a lower surface 6 of a steel plate, And the lower surface 6 and the side surface 8 of the drum are connected to each other so as to form the abutment portion 10 after the rear surface of the main body or the side surface 8 is brushed.

In order to decontaminate the drum containing the radioactive waste, the radioactive material remaining in the gap between the lower surface (6) and the side surface (8) of the drum should be removed. However, the clearance is a fine gap of less than 1 mm, It is still difficult to check for contamination.

To solve this problem, it is necessary to separate the bottom surface of the drum from the main body, and development of a process and apparatus capable of effectively separating the drum from the main body is required.

Japanese Patent Application Laid-Open No. 10-2016-0131817 (Publication date: November 16, 2016)

The present invention has been made to solve the above-mentioned problems,

It is an object of the present invention to provide a drum cutting system configured to cut and separate a lower surface rim of a drum for effective decontamination of the drum.

It is to be understood that the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be understood by those skilled in the art to which the present invention belongs .

The features of the present invention for achieving the objects of the present invention as described above and performing the characteristic functions of the present invention described below are as follows.

A drum cutting system according to the present invention includes: a fixing unit for fixing a drum; A rotating part for rotating the fixing part; And a cutting portion formed on one side of the fixing portion, for cutting the drum.

Preferably, the fixing part, the rotating part, and the cutting part are disposed in the housing.

The dust collecting unit may further include a dust collecting unit disposed inside the housing or connected to the housing to remove contaminants. Preferably, the dust collecting unit includes a pre-filter and a HEPA filter disposed on the pre-filter.

According to an aspect of the present invention, the fixing portion includes: a body portion having an upper portion thereof opened and a chuck for fixing a drum mounted thereon; And a clamp for fixing the drum on the upper side of the body part, wherein the rotary part is installed at a lower part of the fixing part to rotatably support the fixing part. Preferably, the rotating portion includes: a motor having a motor shaft mounted at one end thereof with a motor-side bevel gear; And a rotation shaft configured to rotate the body including a rotation-side bevel gear to which rotation of the motor shaft is transmitted. Preferably, the motor may include at least one of being equipped with a reducer and having an inverter.

 According to another aspect of the present invention, the cutting portion includes: a milling blade rotatably installed around a vertical direction; And a driving unit for providing rotational force to the milling blade. Preferably, the apparatus further comprises a position adjusting device configured to adjust the position of the milling blade. Preferably, the position adjusting device may be a lead screw connected to the milling blade.

According to another aspect of the present invention, the housing may include a door and a transparent window that can be opened and closed on one side.

According to another aspect of the present invention, there is further provided a separating unit disposed in the housing, wherein the separating unit includes a frame, and on one side of the frame, a fitting portion corresponding to the size of the embossing of the drum is formed.

The effects of the drum cutting system according to the present invention will be described in the <Detailed Description of the Invention>.

Figure 1 shows a general drum,
Fig. 2 shows an enlarged view of part A of Fig. 1,
3A shows a cutting unit of a drum cutting system according to an embodiment of the present invention,
Figure 3b shows an upper side view of a cutting unit of a drum cutting system according to an embodiment of the present invention,
4 shows a dust collecting unit of a drum cutting system according to an embodiment of the present invention,
Figure 5 shows a separate unit of a drum cutting system according to an embodiment of the present invention.

The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. And should not be construed as limited to the embodiments described herein, but should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Meanwhile, in the present invention, the terms first and / or second etc. may be used to describe various components, but the components are not limited to the terms. The terms may be referred to as a second element only for the purpose of distinguishing one element from another, for example, to the extent that it does not depart from the scope of the invention in accordance with the concept of the present invention, Similarly, the second component may also be referred to as the first component.

Whenever an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but it should be understood that other elements may be present in between something to do. On the other hand, when it is mentioned that an element is "directly connected" or "directly contacted" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "between" or "adjacent to" and "directly adjacent to" should also be interpreted.

Like reference numerals designate like elements throughout the specification. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited element, step, operation, and / Or additions.

The drum cutting system according to the present invention may include a cutting unit for cutting the drum, a separating unit for separating the cut drum, and a dust collecting unit for removing dust generated in at least one of the cutting unit and the separating unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know.

Referring to FIG. 3A, according to the drum cutting system of the present invention, a cutting unit 100 for cutting a drum includes a fixing unit for fixing the drum to be cut; A rotation part for providing a rotational force to the fixed part; And a cutting portion formed for cutting the drum on one side of the fixing portion.

The fixing portion of the cutting unit 100 may include fixing means capable of firmly fixing the drum to the cutting unit.

According to one aspect of the invention, the securing means may comprise a chuck 112. The chuck can be, for example, a chuck for use in a lathe. The drum is fixed while exerting pressure from the inside to the outside of the drum using a rotational force. The chuck 112 is preferably manually driven so that the operator can visually check the deformation of the drum according to the degree of deformation of the drum in order to prevent the drum from being crushed due to excessive force applied during gear rotation.

In addition, according to another aspect of the present invention, the fastening means may comprise a clamp 120 which is configured to rigidly grip the drum 2. The clamp 120 is configured to fasten and fix the side surface of the drum.

In addition, according to another aspect of the present invention, the securing means can include either the chuck 112 and the clamp 120, and can include both the chuck 112 and the clamp 120. [ When the fastening means includes both the chuck 112 and the clamp 120, the chuck 112 and the clamp 120 may be spaced apart to fix the upper and lower portions of the side surface of the drum, respectively. For example, when the chuck 112 fixes the upper portion of the drum, the clamp 120 fixes the lower portion of the drum. Conversely, when the chuck 112 fixes the lower portion of the drum, May be formed to fix the upper portion.

In this embodiment, the chuck 112 may be rotatably formed and insertably secured to the top surface that is the open side of the drum, and may be seated on top of the rotatably formed plate 114. In addition, the clamp 120 is mounted on the lower surface side opposite to the upper surface of the drum so that the side surface of the drum can be fixed while being tightened. Although two clamps 120 are shown in the figure, it is not so limited, and fewer or greater numbers of clamps may be included. Also, a case or a body portion 116 for installing the clamp 120 is provided, and the body portion 116 is formed such that the upper surface thereof is opened to allow insertion of the drum. Although the body portion 116 is shown as a cylindrical shape in FIG. 3B, the shape of the body portion 116 is not limited thereto.

The fixed portion of the cutting unit 100 is rotatably supported by a lower portion of the fixing portion or a rotating portion formed at a lower portion of the plate 114. [ The rotating portion may include a motor 122 for providing a rotating force and a rotating shaft 132 for transmitting the rotating force of the motor 122 to rotate the fixed portion.

The motor 122 is mounted on the motor bracket 124 and the motor side bevel gear 130 is mounted on the end of the motor shaft via the coupling 128. The motor-side bevel gear 130 transmits the rotational force of the motor to the rotating-shaft-side bevel gear 134 mounted on the end of the rotating shaft 132. The rotary shaft 132 on which the rotary shaft side bevel gear 134 is mounted is connected to the fixing portion through the support plate 136 formed so that the fixing portion is seated to allow the fixing portion to rotate. In addition, the support plate 136 may include a plurality of legs 140.

In addition, the motor 122 may be equipped with a reduction gear for adjusting the drum rotation rate or an inverter in view of the limitation of the gear magnification. Also, when the fixed portion and the rotating portion are vertically installed, the magnification of the bevel gear installed for smooth operation of the motor is also taken into consideration.

A cutting portion for cutting the drum to be mounted is provided at one side of the fixing portion. The cutting portion may include a driving portion that provides rotational force to the milling blade 142 and the milling blade 142. [

The milling blade 142 is rotatably installed at a high speed around the vertical direction. The milling blade 142 protrudes from the post 144 that supports the milling blade 142 and is attached to the post 144 by a milling blade mount configured to securely mount the milling blade 142, Respectively. Further, in order to cut the rim of the lower surface of the drum, the milling blade is constructed such that a milling blade such as a milling blade is provided so as to have a grinding function on the side surface of the drill blade and is laid laterally.

The driving unit may include a motor having a variable speed motor or an inverter so as to adjust the rotational speed of the milling blade 142 according to drum material, drum rotation speed, and the like.

The cutting portion may further include a position adjusting device configured such that a vertical position of the milling blade 142 can be adjusted. For example, the position adjusting device may be a lead screw to which a milling blade is connected so as to adjust a position of the milling blade in a vertical direction.

As shown in FIG. 4, the drum cutting system according to the present invention may further include a dust collecting unit 200 for removing contaminants such as dust.

Since the dust generated in the cutting process is floating inside the housing, the radioactive material inside the housing may be diffused to the outside after the end of the work, which increases the possibility of internal exposure of the operator. In order to prevent this, a dust collecting unit 200 may be provided to purify the radioactive material generated during the cutting operation.

The dust collecting unit 200 may include an activated carbon filter, a chemical washing device, or the like in order to collect gaseous particles, and may further include a liquid collecting device, an evaporation preventing device, a recovery container and the like in the case of a liquid radioactive material . The fine dust generated in the drum depends on the type and amount of the radioactive material stored in the drum. For example, since there are gaseous particles or liquid radioactive materials, the dust collecting unit can be appropriately selected in consideration of this.

For example, the dust collecting unit 200 of the drum cutting system according to the present invention may employ a dust collecting device for purifying particulate radioactive material. For this purpose, the dust collecting unit 200 may be formed of a double filter structure including a pre-filter 220 and a hepar filter 230. In order to purify the particulate matter, a pre-filter (220) capable of removing large particles in one step is used, and a HEPA filter (230) having an efficiency of 99.97% ) Is used to remove the radioactive material, and the purified air is exhausted through the ventilation system. The capacity of the exhaust fan for the purification of radioactive materials is determined by the internal volume of the housing and the air circulation rate.

Referring to FIG. 5, the drum cutting system according to the present invention may further include a separation unit 300 for separating the cut drum. The separation unit 300 may include a frame 310 and a fitting portion 320. The frame 310 may be a three-dimensional structure having only a frame, and the fitting portion 320 is formed so as to insert and fix the drum through one surface of the frame 310, particularly, the upper surface.

The drum cutting system according to the present invention may further include a housing in which at least one of the cutting unit 100 and the separating unit 300 is disposed. In the process of cutting the lower surface of the drum, radioactive substances and metal fine dust existing in the gap between the lower surface and the side surface of the drum are scattered. In this case, when the scattered dust is buried on the skin of the worker, Internal exposure occurs through the body. In order to prevent the radioactive material from being scattered to the workplace in the cutting process of the lower face of the drum, a housing may be formed, and the cutting unit 100 may be installed in the housing. In addition, the dust collecting unit 200 may be connected to the inside of the housing or the housing to remove contaminants generated during the cutting process.

A transparent window may be provided on one side of the housing for observing the inside of the housing, and a door that can be opened or closed may be formed on the same side as the side on which the transparent window is provided or on the other side. The door is provided with an interlock device to prevent an emergency situation from occurring through the window. When the door is opened abnormally, all the driving parts including the motor are stopped to protect the operator and the equipment.

Further, the drum cutting system according to the present invention may further include a control unit. The control unit controls the operation of the cutting unit to stop when an abnormality occurs during operation or when the door of the housing is unintentionally opened.

Further, according to the drum cutting system according to the present invention, for driving the cutting unit, closing the door of the housing; Rotating the milling blade; Adjusting the position of the milling blade; And a step of rotating the fixing unit so that the cutting unit can be operated, and conversely, stopping the rotation of the rotation unit; Stopping rotation of the milling blade; Raising the milling blade in situ; And opening the door of the housing, the operation of the cutting unit can be stopped.

The operation principle and effect of the drum cutting system according to the present invention are as follows. The drum cutting system according to the present invention cuts the joint 10 to form the lower surface 6 of the drum 2 in consideration of the fact that it is very important to decontaminate the joint 10 for decontamination of the drum, And the side surface (8).

To this end, according to the present invention, as shown in FIG. 2, the joining portion 10 of the drum of about 1.5 mm is cut so that the lower surface 6 and the side surface 8 can be separated from each other.

The drum to be cut is mounted on the cutting unit (100). To cut the bottom of the drum, set the drum upside down with the underside facing up. The shape of the drum at the time of its manufacture is difficult to maintain at the time of its manufacture in a process close to its original shape, or in the process of packaging, handling, etc. of the waste. According to the fixing portion of the present invention, it is possible to provide an effective fixing portion for fixing the drum in a distorted form. In addition, according to the present invention, there is provided a fixing portion in which the fixing portion connected to the rotary portion is firmly fastened without loosening during rotation of the drum, and the drum fixing force is not weakened.

The rotational speed of the rotating part connected to the fixed part was selected by operating the drum rotating speed (rpm) under the following conditions. As a result, it was found that cutting the drum part for 15 minutes to 20 minutes .

- Drum diameter: 600 mm

- Drum circumference: 2 π r = 1,884 mm

- Milling blade rotation speed: 1,500 rpm

- Rotation rpm = 1/4 to 1/3 (1 revolution / 15 minutes to 1 revolution / 20 minutes)

In addition, according to the present invention, the lower surface of the drum may be pressed, struck, or distorted by internal / external pressure during handling, whereby the height of the lower surface may be uneven when the drum is fixed upside down . Accordingly, when cutting the rim of the lower surface of the drum, the portion lower than the arbitrary position can be cut less when the cutting portion is fixed at an arbitrary position, and the cutting height is increased at the portion higher than the arbitrary position, A crowd can be added. Therefore, a position adjusting device is provided as a micromanipulator that can vertically manipulate the cutting portion according to the height of the lower surface rim.

The cut drum is mounted in the separating unit 300 so that the embossing 4 is fitted in the fitting portion 320 and an external force such as a striking force is applied to the drum 2 to facilitate separation of the lower face 6 and the side face 8 do. Even if the rim of the drum is cut off, it is difficult to separate the bottom because it is caught in the main body, and the cut surface is sharp, so it may affect the safety of the operator when handling the bottom of the drum or moving the drum. For this purpose, it is necessary to fix the embossed portion of the drum, for example, by inserting it into a circular mold, and to striking the bottom surface from above. In addition, the dust collecting unit may be connected to the separating unit to collect and purge the dust that is scattered in the process of hitting the bottom surface of the drum.

The dust collecting unit 200 is provided with an inlet 212 into which the air generated in the cutting unit 100 and the separating unit 300 flows to remove the dust generated in the cutting unit 100 and the separating unit 300 The introduced air is filtered in the prefilter 220 and then the filtered air passing through the HEPA filter 230 disposed on the upper side of the main body 210 is discharged to the air outlet 214 using a fan or the like.

On the other hand, a very small gap of about 1 mm or less exists at the connection portion with the side surface of the lower portion of the drum, and the drum containing the radioactive waste has a radioactive material in the gap portion of the lower surface, The surface contamination test was not possible.

In order to solve this problem, in order to solve this problem, it is necessary to identify the bottom side of the drum by the most effective method in terms of decontamination and contamination inspection, and to separate the lower surface and the side surface of the drum, An effective process and apparatus for changing and separating the lower surface and the side surface into a separable structure have been developed.

In addition, the present invention can be applied not only to all operations for separating the drum bottom and the main body to decontaminate the drum packed with the radioactive waste, but also to separate the drum bottom and the main body when disposing a round cylindrical drum such as a 200 liter drum Which can be applied to all the industrial fields where there is.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

2: Drums
4: Embossing
6: Lower surface
8: Side
10:
100: Cutting unit
112: Chuck
114: Plate
116:
120: Clamp
122: motor
124: Motor bracket
128: Coupling
130: Motor side bevel gear
132:
134: Bevel gear on the rotating shaft side
136: Support plate
138: Roller Bearings
140: Leg
142: Milling blade
144: Post
146: Milling blade mounting part
148: Lead Screw
200: dust collecting unit
210:
212: Air inlet
214: air outlet
220: prefilter
230: Hepa filter
300: separation unit
310: frame
320:

Claims (12)

A fixing part for fixing the drum;
A rotating part for rotating the fixing part;
A cutting part formed on one side of the fixing part, for cutting the drum; And
And a housing in which the fixing portion, the rotating portion, and the cutting portion are disposed,
And a separating unit disposed in the housing, wherein the separating unit includes a frame, and on one side of the frame, a fitting corresponding to the size of the embossing of the drum is formed.
delete The drum cutting system of claim 1, further comprising a dust collecting unit disposed within the housing or connected to the housing to remove contaminants.
The method according to claim 1,
Wherein the fixing portion includes: a body portion having an upper portion thereof opened and a chuck for fixing a drum mounted thereon; And a clamp for fixing the drum on the body portion,
Wherein the rotary portion is provided at a lower portion of the fixing portion and rotatably supports the fixing portion.
5. The apparatus according to claim 4,
A motor provided with a motor shaft including a motor side bevel gear at one end; And
And a rotating shaft including a rotating shaft side bevel gear to which rotation of the motor shaft is transmitted to rotate the body portion.
The drum cutting system of claim 5, wherein the motor includes at least one of a gear reducer mounted and an inverter.
The cutting tool according to claim 1,
A milling blade installed to be rotatable about a vertical direction; And
And a drive for providing rotational force to the milling blade.
9. The drum cutting system of claim 7, further comprising a position adjustment device configured to adjust a position of the milling blade.
9. The drum cutting system of claim 8, wherein the position adjusting device is a lead screw connected to a milling blade.
The drum cutting system of claim 1, wherein the housing comprises a door and a transparent window on one side.
delete The drum cutting system of claim 3, wherein the dust collecting unit comprises a pre-filter and a HEPA filter disposed above the pre-filter.

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