KR102598791B1 - Double structure drum to prevent contamination of inner drum - Google Patents

Abstract

A double drum capable of preventing contamination of the internal drum and a method of manufacturing the double drum are disclosed. The disclosed double drum capable of preventing contamination of the internal drum includes an external metal drum consisting of an external drum body made of metal and having an open top, and an external drum lid coupled to the top of the external drum body and having at least one coupling hole formed thereon; It is accommodated inside the external metal drum, contains contents therein, and has at least one inlet connected to the at least one coupling hole at the top, and an inner cap that is screwed to the inner peripheral surface of the at least one inlet. It is configured to include an inner synthetic resin drum; wherein the inner diameter of the coupling hole portion is configured to be larger than the outer diameter of the inlet, and when the inner synthetic resin drum is inserted into the outer drum body, the outer drum lid is placed on the outer drum. When placed in the upper coupling position of the drum body, the injection port is inserted into the coupling hole and is arranged to protrude upward, is shaped like a ring, and is screwed to the outer thread additionally formed on the outer peripheral surface of the injection port on the inner peripheral surface. A female thread is formed to allow this to occur, and a socket groove is formed in a ring shape on the lower surface into which the upper circumference of the coupling hole portion is inserted, and a separation prevention nut is formed to couple the injection port and the coupling hole portion.

Description

Double drum that can prevent contamination of the inner drum {Double structure drum to prevent contamination of inner drum}

The present invention relates to a double drum configured to have an internal synthetic resin drum built inside an external metal drum. More specifically, when assembling the internal drum and the external drum, the internal drum is not contaminated and cleanliness is maintained well. This is about a double drum that can prevent contamination of the internal drum that has been improved to enable assembly.

Generally, polyethylene drums and steel drums are used as containers to contain liquid chemical products such as liquid medicines.

However, although polyethylene drums have excellent chemical resistance and corrosion resistance that can withstand highly corrosive substances such as strong acids and strong alkalis, they have the problem of being weak to external shocks. In addition, steel drums are strong against external impacts and can protect the contents, but due to the characteristics of iron (Fe), there is a problem with the chemical resistance of the contents, such as corrosion in response to highly corrosive substances.

Accordingly, a double drum that has strong chemical resistance to the contents and can protect the contents from external shocks has been developed and used.

Referring to FIGS. 1 to 3, a conventional double drum will be described as follows.

A conventional double drum consists of an external metal drum (10) and an internal synthetic resin drum (20) installed inside the external metal drum (10).

In this conventional double drum, with the outer drum body 11 and the outer drum lid 12 separated, the inner synthetic resin drum 20 is inserted into the outer drum body 11 and the outer drum lid 12 is placed on the outer drum body 11. It is combined with the upper edge of the drum body 11 to seal the outer drum body 11, and the inlet 22 of the inner synthetic resin drum 20 is coupled to the coupling hole 12a formed in the outer drum lid 12. The manufacture of double drums takes place.

However, in this conventional double drum, the inner synthetic resin drum 20 is inserted into the outer drum body 11, and the outer drum lid 12 is coupled to the outer drum body 11, and the inlet 22 is opened. In order to couple it to the coupling hole 12a, before inserting the internal synthetic resin drum 20 into the external drum body 11, remove the cap 24 coupled to the injection port 22 and then insert the internal synthetic resin drum 20 into the external drum body 11. Because it is inserted inside, a problem occurred where the inside of the internal synthetic resin drum 20 is primarily contaminated due to the separation of the cap 24.

Typically, a semiconductor double drum for containing semiconductor reagents such as ammonia water is very sensitive to the degree of contamination of the internal synthetic resin drum 20, so the internal synthetic resin drum 20 is manufactured in a clean room and the internal synthetic resin drum (20) is manufactured in a clean room. 20) Manufacturing is carried out so that the cap 24 is coupled to the injection port 22 with the interior completely uncontaminated. For the assembly of the external metal drum 10 and the internal synthetic resin drum 20, the cap 24 is installed. ) is separated from the inlet 22, fine dust particles such as external particles may flow into the internal synthetic resin drum 20, thereby causing primary contamination of the internal synthetic resin drum 20.

In particular, as shown in Figure 2 (a), when the internal synthetic resin drum 20 is inserted into the external drum body 11 and the external drum lid 12 is coupled to the external drum body 11, the inlet ( In order to couple 22) to the coupling hole 12a, the assembly tool 30 is inserted into the internal synthetic resin drum 20 through the coupling hole 12a and the injection port 22a, as shown in (b) of FIG. 2. Then, by unfolding the tool bar 12 of the assembly tool 30 and pulling it upward, the stopping protrusion 22a formed at the top of the injection port 22 is positioned at the top of the coupling hole 12a as shown in (a) of FIG. 3. Fitting is done in the form of a snap coupling, and then an assembly process is performed to screw the cap 24 back into the injection port 22 as shown in (d) of FIG. 3. In this way, the assembly tool 30 is used. Secondary contamination of the internal synthetic resin drum 20 occurred during the process of pouring it into the injection port 22a and pulling it upward.

In this way, when assembling the external metal drum 20 and the internal synthetic resin drum 20 for manufacturing a conventional double drum, primary contamination of the internal synthetic resin drum 20 occurs due to separation of the cap 24. In addition, secondary contamination of the internal synthetic resin material 20 occurred due to the insertion of the assembly tool 30, which greatly increased the degree of contamination, making it very difficult to use it for containing high-precision process reagents such as semiconductor reagents.

In some cases, separate cleaning is performed by removing the cap 24 from the double drum manufactured in this way and washing the internal synthetic resin drum 20 by injecting washing water such as ammonia water into the internal synthetic resin drum 20 through the inlet 22. Although processing is performed, the addition of such cleaning processing has the problem of increasing costs due to cleaning and complicating the manufacturing process.

In addition, the existing double drum uses seaming (which overlaps the rim of the outer drum lid 12 and the rim of the outer drum body 11 and then rolls it into a circle) when joining the outer drum lid 12 to the outer drum body 11. It is a structure that is joined through seaming processing, and the injection port 22 is pulled into the coupling hole portion 12a and the locking protrusion 22a is snapped into the upper end of the coupling hole portion 12a, so the assembly Later, the outer drum lid 12 could not be separated from the outer drum body 11 and the inner synthetic resin drum 20, so there was a problem that the inner synthetic resin drum could not be replaced due to aging.

Registered Utility Model No. 20-0431773 Registered Utility Model No. 20-0433621

The present invention was created to solve the conventional problems as described above. When assembling the external metal drum and the internal synthetic resin drum, it is necessary to add a separate cleaning process to prevent contamination inside the internal synthetic resin drum. The purpose is to provide a double drum capable of preventing contamination of the internal drum with an improved structure so that a double drum with high cleanliness can be manufactured without any contamination.

In addition, another object of the present invention is to provide a double drum capable of preventing contamination of the inner drum with an improved structure so that only the inner synthetic resin drum can be replaced and used when the inner synthetic resin drum becomes worn due to the use of the double drum. there is.

However, the purpose of the present invention is not limited to this, and of course, even if not explicitly mentioned, purposes or effects that can be understood from the means of solving the problem or the embodiment are also included.

In order to achieve the above object, the double drum capable of preventing contamination of the inner drum of the present invention is made of a metal material and has an outer drum body with an open top, and an outer drum body that is coupled to the top of the outer drum body and has at least one coupling hole formed. An external metal drum consisting of a drum lid; It is accommodated inside the external metal drum, contains contents therein, and has at least one inlet connected to the at least one coupling hole at the top, and an inner cap that is screwed to the inner peripheral surface of the at least one inlet. It is configured to include an inner synthetic resin drum; wherein the inner diameter of the coupling hole portion is configured to be larger than the outer diameter of the inlet, and when the inner synthetic resin drum is inserted into the outer drum body, the outer drum lid is placed on the outer drum. When placed in the upper coupling position of the drum body, the injection port is inserted into the coupling hole and is arranged to protrude upward, is shaped like a ring, and is screwed to the outer thread additionally formed on the outer peripheral surface of the injection port on the inner peripheral surface. A female thread is formed to allow this to occur, and a socket groove is formed in a ring shape on the lower surface into which the upper circumference of the coupling hole portion is inserted, and a separation prevention nut is formed to couple the injection port and the coupling hole portion; and an interior of the socket groove. A separation prevention ring is further configured to surround the coupling hole and form close contact to prevent the separation prevention nut from being separated from the coupling hole. At the bottom of the separation prevention ring, an upper circumference of the coupling hole is provided. A close contact groove is formed by fitting in a fitting form, and the outer drum lid has a border configured to be detachably coupled to the top of the outer drum body, and the top of the outer drum body has a cover that is rolled outward. A ring-shaped reinforcement part is formed, and the ring-shaped reinforcement part is inserted around the outer drum lid to form a bent part surrounding the ring-shaped reinforcement part. With the ring-shaped reinforcement part inserted into the bent part, the ring-shaped reinforcement part is inserted around the bent part and the bending part is formed. It further includes; a coupling means for coupling the ring-shaped reinforcement portion with the bent portion, wherein a sealing member is formed inside the bent portion, and when the ring-shaped reinforcing portion is inserted and coupled to the bent portion, the sealing member forms a ring-shaped portion with the bent portion. It is configured to improve airtightness by sealing the reinforcing part, and the upper and lower width of the anti-separation nut is configured to be smaller than the upper and lower width of the inlet, and the anti-separation nut is screwed to the lower part of the male thread formed on the lower outer peripheral surface of the inlet. This is done, the lower part is made in the form of an open cap, and a fastening protrusion is formed at the bottom of the inner circumferential surface, surrounding the upper surface of the inner cap and the upper outer circumferential surface of the inlet, and screwed to the male thread formed on the upper outer circumferential surface of the inlet. It further includes an external protective cap, wherein when the external protective cap is screwed to the upper outer peripheral surface of the inlet, the lower end of the external protective cap is configured to be in close contact with the upper end of the anti-separation nut.

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The coupling means may be comprised of a band clamp that couples and fixes the bent portion to the ring-shaped reinforcement portion by bending and pressing the bent portion.

According to the above, when assembling the external metal drum and the internal synthetic resin drum, the assembly with the external metal drum is performed without the need to separate the inner cap formed on the internal synthetic resin drum, so contamination of the internal synthetic resin drum does not occur. High-cleanliness double drums can be manufactured, and these high-cleanliness double drums are very suitable for use in semiconductor processes. In particular, there is no need to perform a separate cleaning process to clean the double drums in order to use them for existing semiconductor processes. This has the effect of significantly lowering the unit price of double drums by reducing additional costs incurred during the cleaning process.

In addition, according to the present invention, when the internal synthetic resin drum becomes worn due to long-term use of the double drum, only the internal synthetic resin drum can be replaced and used, so the external metal drum can be used semi-permanently, thereby improving resource utilization. It has the effect of significantly reducing the cost of using double drums from the user's perspective.

1 is an exploded view of a conventional double drum;
Figures 2 and 3 are main drawings for explaining the assembly process of a conventional double drum;
Figure 4 is an exploded view showing a double drum capable of preventing contamination of the internal drum according to the first embodiment of the present invention;
Figures 5 to 11 are schematic diagrams for explaining the assembly process of a double drum. Figures 5 to 8 are diagrams showing the assembly process of the outer drum body and the outer drum lid, and Figures 9 to 11 are diagrams showing the inner synthetic resin drum. This is a drawing to explain the process of connecting the inlet of the to the coupling hole of the outer lid,
Figure 12 is a combined cross-sectional view showing the completed assembly of the double drum capable of preventing contamination of the inner drum of the present invention.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments related to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art.

In this specification, when an element is referred to as being on another element, it means that it may be formed directly on the other element or that a third element may be interposed between them. Additionally, in the drawings, the thickness of components is exaggerated for effective explanation of technical content.

Embodiments described in this specification will be explained with reference to cross-sectional views and/or plan views, which are ideal illustrations of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical content. Therefore, the shape of the illustration may be changed depending on manufacturing technology and/or tolerance. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include changes in form produced according to the manufacturing process. For example, an etch area shown at a right angle may be rounded or have a shape with a predetermined curvature. Accordingly, the regions illustrated in the drawings have properties, and the shapes of the regions illustrated in the drawings are intended to illustrate a specific shape of the region of the device and are not intended to limit the scope of the invention. In various embodiments of the present specification, terms such as first and second are used to describe various components, but these components should not be limited by these terms. These terms are merely used to distinguish one component from another. Embodiments described and illustrated herein also include complementary embodiments thereof.

The terms used in this specification are for describing embodiments and are not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, 'comprises' and/or 'comprising' does not exclude the presence or addition of one or more other elements.

In describing specific embodiments below, various specific details have been written to explain the invention in more detail and to aid understanding. However, a reader skilled in the art to understand the present invention will recognize that it can be used without these specific details. In some cases, it is mentioned in advance that when describing the invention, parts that are commonly known but are not significantly related to the invention are not described in order to prevent confusion without any reason in explaining the invention.

Hereinafter, with reference to FIGS. 4 to 12, a double drum capable of preventing contamination of the internal drum and a method of manufacturing the double drum according to an embodiment of the present invention will be described.

The double drum of the present invention is configured to include an external metal drum 110, an internal synthetic resin drum 120, a separation prevention nut 130, and an external protective cap 140.

The present invention provides an external metal drum 110, and an internal synthetic resin drum 120 having chemical resistance and corrosion resistance that is inserted and installed inside the external metal drum 110 and contains liquid contents such as reagents for semiconductor manufacturing such as ammonia water. ) is configured to include.

The external metal drum 110 is made of a metal material and is coupled to an external drum body 111 in a cylindrical shape with an open top, and an open upper part of the external drum body 111 to form an external drum body 111. It is configured to include an external drum lid 113 that is sealed.

The upper surface of the outer drum lid 113 is provided with coupling holes 113a on one side and the other, respectively, and this coupling hole 113a is bent and protrudes upward from the upper surface of the external drum lid 113a.

The internal synthetic resin drum 120 is made of a synthetic resin material with chemical resistance and corrosion resistance, and is substantially cylindrical to provide a space to contain liquid contents such as reagents for semiconductor manufacturing such as ammonia water, and the external metal drum 120 is made of a synthetic resin material with chemical resistance and corrosion resistance. It is installed to be configured to be accommodated inside the drum 110.

The internal synthetic resin drum 120 has an injection port 122 on one side and the other side at the top, and is configured to contain or remove contents from the internal synthetic resin drum 120 through the injection port 122.

In addition, the injection port 122 is inserted into the coupling hole 113a and is configured to protrude upward from the upper surface of the external drum lid 113.

An inner screw thread 122a is formed on the inner peripheral surface of the injection port 122, and an outer screw thread 122b is formed on the outer peripheral surface. The inner cap 124, which has a male thread 124a formed on its outer peripheral surface, is screwed to the inner thread 122a and is configured to open and close the injection port 122.

In the present invention, the internal synthetic resin drum 120 is composed of an injection port 122, and the configuration in which the injection port 122 is screwed to the inner cap 124 is the same as a known conventional internal synthetic resin drum. The invention differs in that an external thread 122b is additionally formed on the outer peripheral surface of the injection port 122.

In the present invention, the internal synthetic resin drum 120 is manufactured in a clean room and the inner cap 124 is coupled to the injection port 122, so that the internal space containing the contents can be manufactured in a high cleanliness state. there is. The internal synthetic resin drum 120 manufactured in this way can be assembled with the external metal drum 110 as a post-process.

In the present invention, there are two injection ports 122 and two coupling hole portions 113a, so that the contents can be injected and withdrawn through the two injection ports 122, respectively. However, the number of each of the injection port 122 and the coupling hole portion 113a is not limited to two, and each may be composed of only one or three or more, so the number is not important.

In the present invention, the inner diameter of the coupling hole 113a is configured to be larger than the outer diameter of the injection port 122, and the outer drum lid 113 is installed in the state in which the inner synthetic resin drum 120 is inserted into the outer drum body 111. When placed at the upper coupling position of the external drum body 111, the inlet 111 is inserted into the coupling hole 113a and is configured to protrude upward.

The anti-separation nut 130 is made of a nut with a female thread 131 formed on its inner circumferential surface for screwing with the outer thread 122b formed at the injection port 122, and has a ring shape on its lower surface, forming a coupling hole 113a. It is configured to form a socket groove 132 into which the upper peripheral portion of is inserted.

When the separation prevention nut 130 is screwed to the outer peripheral surface of the injection port 122, the coupling hole portion 113a is inserted and fixed into the socket groove 132, thereby coupling the injection port 122 and the coupling hole portion 113a to each other.

In the present invention, the anti-separation nut 130 is configured so that a anti-separation ring 135 is inserted into the socket groove 132, and the upper circumference of the coupling hole portion 113a is pressed at the bottom of the anti-separation ring 135. It is configured to form a close contact groove 136 in which close contact is achieved by fitting in a fitting form. In this way, the separation prevention ring 135 embedded in the socket groove 132a at the bottom of the separation prevention nut 130 is screwed into the outer thread 122b formed on the outer peripheral surface of the injection port 122. , the upper circumference of the coupling hole portion 113a is fitted into the close contact groove 136, maintaining a firm close fixation to prevent movement of the coupling hole portion 113a, thereby improving the coupling between the coupling hole portion 113a and the injection port 122. can increase.

Meanwhile, in this embodiment, the anti-separation nut 130 has a vertical width that is smaller than the vertical width of the inlet 122, so when the anti-separation nut 130 is screwed into the inlet 122, the The upper portion of the outer screw thread 122b formed on the outer peripheral surface is configured to be exposed to the outside.

That is, the upper and lower width of the outer thread 122b is configured to be larger than the upper and lower width of the anti-separation nut 130, and the anti-separation nut 130 is screwed to the outer thread 122b to secure the anti-separation nut 130. When screwing is completed to the lower part of the outer thread (122b), the upper end of the outer thread (122b) is configured to protrude to the upper part of the anti-separation nut (130).

The external protective cap 140 is formed in the form of a cap with an open lower part, and a fastening protrusion 142 is formed on the lower inner peripheral surface, so that it is screwed to the upper end of the outer thread 122b. This outer protective cap 140 prevents the inner cap 124 from being exposed to the outside and is configured to perform an anti-counterfeiting function.
11 and 12, when the external protective cap 140 is screwed to the outer thread 122b of the injection port 122, the lower end of the external protective cap 140 is in close contact with the upper end of the anti-separation nut 130. It is structured to make it happen.

The present invention couples the injection hole 122 and the coupling hole portion 113a by screwing the anti-separation nut 130 to the outer thread 122b formed on the outer peripheral surface of the injection hole 122, and in this state, the external protective cap 140 ) can be assembled to the upper end of the outer thread 122b to cover and protect the inner cap 124 coupled to the inside of the injection port 122.

Referring to Figures 6 to 8, in the present invention, the top of the outer drum body 111 and the edge of the outer drum lid 113 are not joined by seaming as in the past, but are used as separate coupling means. It may be configured to be detachably coupled by a band clamp 150.

In other words, since the existing double drum has the outer drum body and the outer drum lid sealed by seaming, when the inner synthetic resin drum 120 deteriorates, the entire double drum can be discarded and a new double drum can be used. There was no choice but to waste resources and increase the cost of using double drums significantly.

However, the double drum of the present invention can be constructed by combining the outer drum body 111 and the outer drum lid 113 in a separable form so that only the inner synthetic resin drum 120 can be replaced and installed.

Specifically, the present invention has a ring-shaped reinforcement portion 112 rolled outward at the top of the outer drum body 111 so that the user can more conveniently combine or separate the outer drum body 110 and the outer drum lid 113. It is constructed as one piece, and a ring-shaped reinforcement portion 112 is inserted around the outer drum lid 113 to form a bent portion 114 surrounding the ring-shaped reinforcement portion 112.

Even if the external drum lid 113 is placed on the top of the external drum body 111, the ring-shaped reinforcement part 112 is inserted into the bent part 114, and in this state, the bent part is clamped with the band clamp 150. By bending and tightening (114), the band clamp 150 presses the bent portion 114 toward the ring-shaped reinforcement portion 112, so that the outer drum lid 113 and the outer drum body 111 can be coupled.

The band clamp 150 is made of a metal material such as iron, has a ring shape with one side cut, that is, an arch-shaped c shape, and includes a steel band member 151 formed to surround the bent portion 114, and this iron band member 151. The operation knob 153 is configured to be rotatable at one end (151a) of the band member 151 by a first hinge portion (153a), and has a handle portion (153b) at the rear end that allows the user to hold and rotate the band member (153). ), and a second hinge part configured to connect the other end (151b) of the iron band member 151 and the middle part of the operation knob 153, and on one side is rotated by the other end (151b) of the iron band member 151. (155a) is configured, and on the other side, a third hinge portion (155b) is configured to rotate in the middle part of the operation knob 153, so that the operation knob 153 overlaps one end of the iron band member 151. In the case of folding, the other end (151b) of the iron band member (151) is pulled closer to the one end (151a) so that the iron band member (151) is joined by tightening the bent portion (114) and the ring-shaped reinforcement portion (112). When this is achieved and the operation knob 153 is spread out from one end of the iron band member 151, the other end (151b) of the iron band member 151 is pushed away from the one end (151a), It is configured to include a tightening link bar 155 that expands the size of the iron band member 151 to release the tightened state of the bent portion 114 and the ring-shaped reinforcement portion 112.

In the present invention, the steel band member 151 has an arch-shaped curved cross-section, including the upper and side parts of the bent portion 114 where the ring-shaped reinforcement 112 is inserted, and the lower end of the ring-shaped reinforcement 112. By providing a cover groove (s) to surround the steel band member 151 together with the ring-shaped reinforcement portion 112 to strengthen and overall tighten the bent portion 114, the outer drum lid 113 is connected to the outer drum body 111. ) can be strongly bound to.

In addition, in the present invention, a sealing member 114a is formed inside the bent portion 114, and when the ring-shaped reinforcement portion 112 is inserted and coupled to the bent portion 114, the bent portion (114a) is formed by the sealing member 114a. By sealing 114a) and the ring-shaped reinforcement portion 112, the outer drum lid 113 can improve the airtightness between the outer drum body 111.

Hereinafter, with reference to FIGS. 4 to 12, the assembly process of a double drum according to an embodiment of the present invention will be described.

First, with the inner synthetic resin drum 120 inserted into the outer drum body 111 with the top open, the outer drum lid 113 is raised to the top of the outer drum body 111, and the outer drum is opened as shown in FIG. The ring-shaped reinforcement portion 112 formed at the top of the external drum body 111 is inserted into the bent portion 114 formed around the lid 113. In this case, the injection port 122 is inserted into the coupling hole 113a and protrudes upward from the upper surface of the external drum lid 113.

In this state, the steel band member 151 tightens the bent portion 114 and the ring-shaped reinforcement portion 112 as shown in FIG. 6 using the band clamp 150 shown in FIGS. 7 and 8 to secure the outer drum lid 113. ) to the external drum body 111.

Next, as shown in FIGS. 9 and 10, the anti-separation nut 130 is screwed to the outer thread 122b formed on the outer peripheral surface of the injection port 122, so that the coupling hole 113a is inserted and fixed into the socket groove 132. The injection port 122 and the coupling hole portion 113a are coupled to each other. At this time, the coupling hole portion 113a is tightly fixed to the contact groove 136 at the bottom of the separation prevention ring 135 embedded in the socket groove 132, so that it can be firmly coupled and improve airtightness.

Next, as shown in FIG. 11, assembly is completed by coupling the outer protective cap 140 to the upper part of the outer screw thread 122b formed on the outer peripheral surface of the injection port 122 to protect the inner cap 124 from exposure. It can be.

In this way, in the present invention, compared to the existing double drum, in the process of coupling the outer drum lid 113 to the top of the outer drum body 111 without separately removing the inner cap during assembly, the injection port 122 is connected to the coupling hole portion 113a. ) and is positioned in a state that protrudes upward from the upper surface of the external drum lid 113. In this state, assembly is performed by screwing the separation prevention nut 130 to the outer peripheral surface of the inlet 122. Since no internal contamination occurs in the internal synthetic resin drum 120, the cleanliness of the internal synthetic resin drum 120 can be maintained well even after assembly.

In addition, since the present invention is configured to detachably couple the external drum body 111 and the external drum lid 113 by the band clamp 150, when the internal synthetic resin drum 120 deteriorates, the external protective cap 140 ) and the separation prevention nut (30) from the inlet (122), release the band clamp (150) to separate the outer drum lid (113) from the outer drum body (111), and then remove the inner synthetic resin drum (120). After replacing and installing a new one, the band clamp 150 is again coupled to the external drum lid 113 to the external drum body 111, and the separation prevention nut 30 and the external protection cap 140 are sequentially connected to the inlet ( By screwing to the outside of 122), the injection port 122 and the coupling hole portion 113a can be combined, and the injection port 122 can be covered to be used again as a double drum, thereby improving resource recyclability and double drum use. It allows you to save usage costs.

Although the present invention has been shown and described in connection with preferred embodiments for illustrating the principles of the present invention, the present invention is not limited to the configuration and operation as shown and described. Rather, those skilled in the art will be able to understand that many changes and modifications can be made to the present invention without departing from the spirit and scope of the appended claims. Accordingly, all such appropriate changes, modifications and equivalents shall be considered to fall within the scope of the present invention.

110… external metal drum
111… external drum body
113… external drum lid
113a… Combined hole part
120… Internal synthetic resin drum
122… inlet
122a… internal thread
122b… external thread
124… my cap
124a… Male thread
124b… o-ring
130… Anti-separation nut
131… Female thread
132… Socket Home
135… anti-breakaway ring
136… Close groove
140… External protective cap
142… fastening protrusion
s… cover home
150… band clamp
151… iron band member
153… operation knob
153a… 1st hinge part
153b… handle part
155… Tightening link bar
155a… 2nd hinge part
152b… Third hinge part
156… fixing hole
157… fixing ring

Claims (6)

An external metal drum consisting of an external drum body made of metal and having an open top, and an external drum lid coupled to the top of the external drum body and having at least one coupling hole formed thereon;
It is accommodated inside the external metal drum, contains contents therein, and has at least one inlet connected to the at least one coupling hole at the top, and an inner cap that is screwed to the inner peripheral surface of the at least one inlet. It is configured to include an internal synthetic resin drum;
The inner diameter of the coupling hole is configured to be larger than the outer diameter of the inlet, and when the inner synthetic resin drum is inserted into the outer drum body and the outer drum lid is positioned at the upper engaging position of the outer drum body, The injection hole is inserted into the coupling hole and is configured to protrude upward,
It is formed in a ring shape, and a female thread is formed on the inner peripheral surface to allow screw fastening to an external thread additionally formed on the outer peripheral surface of the injection port, and a socket groove into which the upper circumference of the coupling hole portion is inserted is formed in a ring shape on the lower surface of the injection hole. It further includes a separation prevention nut coupling the coupling hole portion,
Inside the socket groove, a separation prevention ring is further configured to surround the coupling hole and be in close contact to prevent the separation prevention nut from being separated from the coupling hole,
At the bottom of the anti-separation ring, a close contact groove is formed to ensure close contact by fitting the upper periphery of the coupling hole in an interference fit form,
The outer drum lid has a border configured to be detachably coupled to the top of the outer drum body,
A ring-shaped reinforcement part rolled outward is formed at the top of the external drum body,
The ring-shaped reinforcement part is inserted around the outer drum lid to form a bent part surrounding the ring-shaped reinforcement part,
It further includes a coupling means that wraps around the circumference of the bent portion and couples the bent portion and the ring-shaped reinforcing portion with the ring-shaped reinforcement portion inserted into the bent portion,
A sealing member is formed inside the bent portion, and when the ring-shaped reinforcement portion is inserted and coupled to the bent portion, the sealing member seals the bent portion and the ring-shaped reinforcing portion, thereby improving sealability,
The upper and lower width of the anti-separation nut is configured to be smaller than the upper and lower width of the inlet, and the anti-separation nut is screwed to the lower part of the male thread formed on the lower outer peripheral surface of the inlet,
The outer protective cap is formed in the form of an open cap, has a fastening protrusion at the bottom of the inner circumferential surface, surrounds the upper surface of the inner cap and the upper outer circumferential surface of the inlet, and is configured to be screwed to the male thread formed on the upper outer circumferential surface of the inlet. It further includes ;,
A double drum capable of preventing contamination of the inner drum, wherein when the outer protective cap is screwed to the upper outer peripheral surface of the inlet, the lower end of the outer protective cap is in close contact with the upper end of the anti-separation nut.
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A double drum capable of preventing contamination of the inner drum, characterized in that the coupling means is made of a band clamp that couples and fixes the bent portion to the ring-shaped reinforcement portion by bending and pressing the bent portion.

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