JP6484526B2 - Method for producing metal drum - Google Patents

Description

  The present invention relates to a metal drum can having a metal top plate, a base plate, and a body, and a method for manufacturing the same.

  Steel drums are, for example, chemical products, liquid fats and oils such as petroleum, gasoline, and lubricating oil, liquid dangerous materials with relatively high viscosity, or contents that are difficult to put in and out of powder or solids, etc. It is a container suitable for filling and transporting. Such steel drums include a sealed type in which a ground plate is wound around a cylindrical body and a top plate is also wound and joined, and an open type in which the top plate is detachable from the body.

  There are various sizes of the steel drums as described above, but there is a type having a large capacity of, for example, 200 liters. In such a large steel drum can, it is difficult to incline and discharge the can itself for discharging the contained liquid. Therefore, as a discharge method, a pump-up method in which a discharge pipe is inserted into the can from the mouth formed on the top plate of the can and the liquid is pumped up, or a room gas or the like is put into the can. A pressurization method is adopted in which the liquid is extruded by injecting and pressurizing the inside of the can to a pressure of about 5 to 200 kPa.

JP 2010-149895 A

  When the liquid is discharged from the can, the suction port is blocked by the bottom inner surface when there is no gap between the suction port of the discharge pipe and the bottom inner surface of the steel drum can. The discharging operation is not possible. Therefore, in order to provide some clearance between the suction port and the bottom inner surface, a discharge pipe shorter than the depth from the above-mentioned mouth portion to the ground plane is used.

  However, in this case, the liquid of the contents inevitably remains in the bottom portion of the steel drum, and the entire amount cannot be discharged. Even in the pump-up system, for example, nitrogen gas or the like is injected into the can in order to prevent the inside of the can from becoming negative pressure as the liquid is discharged. In particular, in the above-described large drum, in order to ensure rigidity when filled with liquid, the base plate of the steel drum can is formed with a shape in which its central portion is pre-expanded to the inside of the can. Sometimes. In this case, at the end of the discharge of the liquid of the contents, the liquid collects at the peripheral edge of the main plate, and the liquid remains in the can at least by the height expanded in the above-described convex shape.

  On the other hand, it is often the case that a flat ground plate is used instead of the convex shape described above. In this case, the center part of the ground plane is bent by the weight of the liquid of the contents, and the ground plane is gently recessed in the vertical direction. Therefore, at the time of discharging the liquid, the liquid of the contents tends to gather at the center portion of the main plate. On the other hand, the suction port in the above-described discharge pipe is located directly below the large plug on the top plate, and is off the central portion of the main plate where liquid easily collects. At this time, even if a long and flexible pipe is used as the discharge pipe, it is convenient if the suction port is accidentally located in the center part of the main plate. From various conditions such as these, the suction port is not always located in the center portion of the main plate. Therefore, the idea of simply using a long and flexible pipe is not a solution.

  In addition, in the case of the above-described pressurization method, since the internal pressure of the steel drum can rises, the ground plate in which the liquid of the contents remains at the time of discharge also swells further outside as compared with the case of only gravity, A maximum depth portion of the concave portion is formed in the center portion of the ground plate. Therefore, in the case of the pressurization method, a lot of liquid remains in this recess, and when the suction port of the discharge pipe is located directly under the large stopper, generally the residual liquid in the can of the contents The amount is larger than the pump-up method. Therefore, there is a problem that a steel drum user adopting the pressurization method needs to devise a reduction in the amount of residual liquid on the discharge device side connected to the steel drum.

Further, from the viewpoint of the cost of the liquid to be stored, the steel drum user wants to reduce the remaining liquid amount as much as possible. Therefore, there is a very strong demand for reducing the amount of residual liquid from a steel drum user to a steel drum manufacturer.
Furthermore, with the recent increase in awareness of resources and the environment, the demand for recycling steel drums after use has increased. In this recycling, the residual liquid in the can is unnecessary, and a waste liquid treatment is required, resulting in a processing cost. Therefore, there is also a demand for reducing the remaining liquid amount from this point.

  The present invention has been made to meet the above-described problems and requirements, and an object of the present invention is to provide a metal drum can that can reduce the amount of residual liquid in the can as compared with the prior art, and a method for manufacturing the same. To do.

In order to achieve the above object, the present invention is configured as follows.
That is, the metal drum can according to the first aspect of the present invention has a metal top plate, a base plate and a body, and the top plate is a metal drum can having a large plug and a small plug,
The base plate is provided with a residual liquid reservoir portion that is positioned corresponding to the large stopper in the vertical direction and has a convex shape toward the outside of the can.

The method for manufacturing a metal drum can according to the second aspect of the present invention includes a metal top plate, a base plate, and a body, and the top plate is a method for manufacturing a metal drum can having a large plug and a small plug. ,
Before tightening the base plate around the body, a residual liquid reservoir that is convex to the outside of the can is formed on the base plate,
Here, the molding of the residual liquid reservoir portion is a press that forms the residual liquid reservoir portion in a state in which the base plate is supported in a state where the peripheral portion of the base plate is fixed and the inner side of the base plate can bend more than the peripheral portion. It is made by processing.

  According to the metal drum in the first aspect of the present invention, the liquid is finally collected in the residual liquid reservoir when the liquid is discharged by providing the residual liquid reservoir in the base plate corresponding to the large stopper. In addition, since the suction port of the discharge pipe inserted into the can from the large stopper is located in the residual liquid reservoir, and the discharge pipe discharges the collected liquid, the amount of residual liquid in the can is reduced compared to the conventional case. Is possible.

  According to the method for manufacturing a metal drum can according to the second aspect of the present invention, when forming the residual liquid reservoir, the peripheral portion is fixed in a state where the inner side of the base plate can bend more than the peripheral portion of the main plate, thereby supporting the base plate. The remaining liquid reservoir is pressed in the state. Therefore, in the said press work, not only a residual liquid reservoir part is shape | molded but a ground plate is shape | molded in the state which also bent the inner part rather than the base-plate peripheral part. In the ground plate processed in this way, when the liquid is discharged, the liquid is efficiently collected in the remaining liquid reservoir portion by the deflection of the inner portion of the peripheral portion of the ground plate. Therefore, according to the manufacturing method, it is possible to reduce the amount of remaining liquid in the can as compared with the conventional method.

It is sectional drawing of the steel drum can in embodiment of this invention. It is a top view of the main plate in the steel drum can shown in FIG. It is an expanded sectional view of the residual liquid reservoir part and the main plate which the steel drum can shown in FIG. 1 has. It is a perspective view for demonstrating the outline of the manufacturing method of the steel drum can shown in FIG. It is a flowchart explaining the outline of the manufacturing method of the steel drum can shown in FIG. It is a detailed flowchart of the positioning process shown in FIG. It is sectional drawing which shows the special metal mold | die used in the manufacturing method of the steel drum can shown in FIG.

  A metal drum that is an embodiment of the present invention will be described below with reference to the drawings. In each figure, the same or similar components are denoted by the same reference numerals. In addition, in order to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art, a detailed description of already well-known matters and a duplicate description of substantially the same configuration may be omitted. . Further, the contents of the following description and the accompanying drawings are not intended to limit the subject matter described in the claims.

  In each embodiment described below, a steel drum can having an internal volume of about 200 liters as defined in JIS Z 1601 is taken as an example as a metal drum can, but the present invention is not limited to this, and 200 liters is used. It is a concept that includes more. Further, the metal drum can is a concept including not only a sealed type (tight head drum) in which a base plate and a top plate are wound and joined to the body, but also an open type in which the top plate is detachable from the body.

In FIG. 1, the steel drum 100 in this embodiment is shown. The steel drum 100 includes a hollow body 101 made of metal and formed into a cylindrical shape, a metal base plate 102 that closes the lower end opening of the body 101, and a metal top plate that closes the upper end opening of the body 101. 103. FIG. 1 shows the above-described hermetically sealed (tight head drum) steel drum can 100 in which a base plate 102 and a top plate 103 are wound around a body 101.
The top plate 103 includes a large plug 111 and a small plug 112. The large stopper 111 is an opening used for taking in and out the contents of the steel drum 100, and is arranged off the center of the top plate 103 as shown in the figure. The small plug 112 has a smaller diameter than the large plug 111 and is mainly an opening used as an air hole when the contents are put in and out. In addition, each position of the large stopper 111 and the small stopper 112 in the top plate 103 is prescribed | regulated by the above-mentioned JIS.

  The main plate 102 has a residual liquid reservoir 120 which is a characteristic component in the steel drum 100 in the present embodiment. The residual liquid reservoir 120 is formed by pressing the main plate 102, and when the content is a liquid, the liquid is finally collected when the liquid is discharged from the steel drum 100. As shown in FIGS. 1 to 3, the residual liquid reservoir 120 is positioned corresponding to the large stopper 111 in the vertical direction 105 and is formed in a convex shape toward the outside of the can.

Here, “position corresponding to the large stopper 111 in the vertical direction 105” means that in the vertical direction 105, the center of the large stopper 111 and the center of the remaining liquid reservoir 120 are located on the same center line 104. Say. Further, since the large stopper 111 and the residual liquid reservoir 120 are in such a positional relationship, the suction port in the discharge pipe attached to the large stopper 111 when the liquid is discharged from the inside of the can has the residual liquid reservoir 120. Fits in.
In addition, the relationship between the sizes of the large stopper 111 and the residual liquid reservoir 120 in plan view is the same when the two are the same, when the residual liquid reservoir 120 is larger, and when the suction port of the discharge pipe is This is one of the cases where the large stopper 111 is larger under the condition that it fits in the residual liquid reservoir 120.

  In FIG. 1 to FIG. 3, the remaining liquid reservoir 120 is shown exaggerated from the actual state for convenience of illustration. Further, the residual liquid reservoir 120 can take various forms depending on the mold described later for molding the residual liquid reservoir 120 and the degree of press working. As an example, in this embodiment, a substantially hemispherical arc shape as shown in FIGS. 1 and 3, or a flat portion 121 that is circular and flat in plan view as shown in FIG. Is a trapezoidal shape having an inclined surface and a peripheral portion 122 that is circular in plan view. In the case of a trapezoidal shape, the flat portion 121 and the peripheral portion 122 may be eccentric (FIG. 2) or concentric. Note that FIG. 2 shows a cross section taken along the line II in the drawing.

Furthermore, with reference to FIG. 3, the residual liquid reservoir 120 will be specifically described.
The residual liquid reservoir 120 has a diameter A of 25 mm or more and less than 60 mm. The residual liquid reservoir 120 has a depth B of 4 mm or more and less than 10 mm with respect to the edge 123 of the residual liquid reservoir 120. Here, the edge portion 123 corresponds to a start portion of the residual liquid reservoir portion 120 formed on the main plate 102 and corresponds to a boundary with the inclined portion 124 described below.

  The above-described values of the diameter A and the depth B in the residual liquid reservoir 120 are values obtained corresponding to the target residual liquid volume of 25 ml to 125 ml in the 200-liter steel drum can 100. The above-mentioned target residual liquid amount is a value under the condition that the suction port of the discharge pipe is located with a gap of several mm from the bottom inner surface of the residual liquid reservoir 120.

  In a conventional 200-liter steel drum that does not take measures against residual liquid, the residual liquid amount is considered to be about 2500 ml on average. The above-mentioned target residual liquid amount is a value set based on this conventional average residual liquid amount. Therefore, by providing the remaining liquid reservoir 120, the amount of remaining liquid can be reduced from about 1% to about 5%.

  As described above, the residual liquid reservoir 120 is formed by pressing the base plate 102. As will be described in detail in the description of the manufacturing method of the steel drum 100 described later, the peripheral portion 125 of the base plate 102 is formed by the press processing. In addition, the inner side portion of the base plate is also bent by pressing. Therefore, the ground plate 102 is also formed with an inclined portion 124 inclined toward the residual liquid reservoir portion 120. Here, the inclined portion 124 indicates a portion from the peripheral edge portion 125 of the main plate 102 to the edge portion 123 of the remaining liquid reservoir portion 120. With respect to such an inclined portion 124, if the difference between the height at the peripheral edge 125 of the main plate 102 and the height at the edge 123 of the residual liquid reservoir 120 is the height difference C in the vertical direction 105, the inclined portion 124 is The height difference C is 2 mm or more and less than 20 mm.

Since the main plate 102 has the inclined portion 124, the residual liquid can be effectively collected in the residual liquid reservoir 120, and the amount of residual liquid can be further reduced.
In addition, the range of each value of the height difference C in the depth B of the residual liquid reservoir part 120 and the inclination part 124 demonstrated above has shown the case where the depth B and the height difference C can each be taken independently. That is, when the maximum values of the depth B and the height difference C are simply added, the height in the vertical direction 105 at the tightening portion (chime portion) between the base plate 102 and the body 101 may be exceeded. Therefore, when the depth B and the height difference C are considered to be connected, the depth B and the height difference C are set to values that are less than or equal to the height of the tightening portion.

The manufacturing method of the steel drum 100 having the residual liquid reservoir 120 described above will be described below with further reference to FIGS.
The body 101 is formed by forming a strip-shaped steel plate into a cylindrical shape, and seam-welding both ends of the steel plate extending in the axial direction of the formed cylindrical body, as shown as a seam welded portion 101a in FIG. Further, an annular zone is formed as necessary.
The top plate 103 is manufactured by attaching a large plug 111 and a small plug 112 to a circular steel plate. In addition, the manufacturing method of these trunk | drum 101 and the top plate 103 is the same as the past.

  Before the base plate 102 is tightened with the body 101, the residual liquid reservoir 120 is formed by pressing as described above. The remaining liquid reservoir 120 is formed using a special mold 200 as shown in FIG. 7 used in this embodiment. The special mold 200 includes an upper mold 201 and a lower mold 202, the upper mold 201 is provided with a convex part 203 for pressing, and the lower mold 202 is provided with a seat part 204 corresponding to the convex part 203. . The lower mold 202 has a concave cross section as shown in the figure, and the seat portion 204 is provided so as to protrude from the concave bottom plate 205 and has a concave portion.

In forming the remaining liquid reservoir 120, the base plate 102 is disposed between the upper mold 201 and the lower mold 202, and the peripheral edge 125 of the base plate 102 is sandwiched between the shoulder 201a of the upper mold 201 and the shoulder 202a of the lower mold 202. In a state where the convex portion 203 is pressed to the seat portion 204 side, the pressing portion 203 is pressed to form the concave residual liquid reservoir portion 120. In addition, since the lower mold 202 has a concave cross-sectional shape, the inner side of the base plate can be bent with respect to the peripheral portion 125 of the base plate 102, specifically, can be recessed with the press work, and the inclined portion 124 is produced. The
Therefore, by using such a mold, the residual liquid reservoir 120 is formed on the ground plate 102, and the inclined portion 124 is simultaneously formed on the ground plate 102 due to the bending of the inside of the ground plate.

  As described above, the body 101, the base plate 102, and the top plate 103 that are molded and manufactured in advance are positioned with respect to each other in step S1, as shown in FIG. This positioning operation will be described in detail below. Then, after positioning, the base plate 102 and the top plate 103 are wound around the body 101 in step S2, and the steel drum can 100 is manufactured.

The positioning operation in step S1 corresponds to step S11 and step S12 shown in FIG. Here, FIG. 4 is also referred to.
In step S11, the seam welded portion 101a in the body 101 is detected by a sensor 151 such as an image sensor. The sensor 151 sends the detected weld position information to the control device 160. The control device 160 controls the operation of the body positioning device 153 that is connected to the body 101 and positions the body 101 so that the seam welded portion 101a is disposed at a predetermined position. Therefore, the seam welded portion 101 a in the body 101 is arranged at a specified position by the body positioning device 153.

Here, the reason why the positioning operation of the seam welded portion 101a is necessary is as follows.
That is, as described above, the body 101, the base plate 102, and the top plate 103 are joined by winding. On the other hand, on the top plate 103, there are a large plug 111 and a small plug 112 at a location close to the peripheral edge of the top plate where the tightening is performed. Therefore, it is necessary to consider the influence of the seam welded portion 101a and particularly the large plug 111 in the winding operation. Therefore, the reason is that in the circumferential direction 101b of the body 101, it is necessary to position the large plug 111 and the small plug 112 apart from the seam welded portion 101a. It should be noted that the position of the large plug 111 on the top plate 103 can be arranged in advance as described below.

In the next step S12, positioning of the seam welded portion 101a, the large stopper 111, and the remaining liquid reservoir 120 is performed.
That is, for the top plate 103, for example, the position of the large stopper 111 can be recognized in advance based on the attachment process of the large stopper 111 and the small stopper 112, for example. Therefore, the orientation, that is, positioning of the top plate 103 can be easily performed. Moreover, in the steel drum can 100 of this embodiment, the main plate 102 has a residual liquid reservoir 120, and the residual liquid reservoir 120 needs to be positioned on the same center line 104 as the large plug 111. The position of the residual liquid reservoir 120 can also be recognized by such a base plate 102 based on the process of forming the residual liquid reservoir 120. Therefore, the orientation, that is, positioning of the main plate 102 can be easily performed, that is, the positioning with respect to the large plug 111 can be easily performed.
In this way, the above-mentioned specified position is set so that the seam welded portion 101a in the body 101 is located in a different place in the circumferential direction 101b with respect to the arrangement of the large stopper 111 and the residual liquid reservoir 120 that can be set relatively easily in advance. Is set.
In addition, about the positioning operation | movement in the top plate 103 and the base plate 102, the large stopper 111 and the residual liquid pool part 120 may be detected using a sensor similarly to the case of the fuselage | body 101, and the top plate 103 and the base plate 102 may be positioned. .

  In the next step S <b> 2, the control device 160 controls the operation of the winding device 155, so that the ground plate 102 and the top plate 103 are wound around the body 101 by the winding device 155. As the winding device 155, a conventionally used device can be used.

In the present embodiment, as described above, the orientation of the base plate 102 and the top plate 103 has been completed in advance, but the following modified method may be employed.
That is, the seam welded portion 101a is detected by the sensor 151, and the positioning of the base plate 102 is performed on the ground plane positioning device so that the remaining liquid reservoir 120 is located at a different location in the circumferential direction 101b with respect to the detected seam welded portion 101a. Do it. After positioning the base plate 102, the body 101 and the base plate 102 are wound by the winding device 155. Further, the top plate 103 is positioned by the top plate positioning device so that the large stopper 111 faces the remaining liquid reservoir 120, and then the body 101 and the top plate 103 are wound by the winding device 155.
Alternatively, in the method of the above modified example, the positioning and winding of the base plate 102 are performed with respect to the body 101 before the top plate 103. However, the positioning and winding of the top plate 103 are preceded by the base plate 102. You may go.

According to the method for manufacturing the steel drum 100 described above, the seam welded portion 101a of the body 101 and the large plug 111 of the top plate 103 can be disposed within a specified center angle range, that is, the circumference of the body 101 They can be arranged at different positions in the direction 101b. Therefore, it is possible to suppress the interaction between the large plug 111 and the seam welded portion 101a during the tightening operation. Similarly, the interaction between the residual liquid reservoir 120 and the seam welded portion 101a in the tightening operation can be suppressed. Through these steps, the central positions of the large stopper 111 and the residual liquid reservoir 120 coincide with each other. As a result, the residual liquid amount in the can can be reduced as compared with the conventional case. Here, the prescribed center angle range corresponds to a range in which the seam welded portion 101a and the large plug 111 are relatively less than 180 degrees at the center angle, and when the center angle is 0 degrees, that is, the seam in the circumferential direction 101b. The case where the welded portion 101a and the large plug 111 are at the same position is excluded.
Furthermore, according to the method of manufacturing the steel drum 100, as described above, since the ground plate 102 is also formed with the inclined portion 124 together with the formation of the residual liquid reservoir portion 120, the liquid is efficiently stored in the residual liquid. Collected in the reservoir 120. Therefore, also from this point, it is possible to reduce the remaining liquid amount in the can as compared with the conventional case.

  The present invention is applicable to a metal drum can having a metal top plate, a ground plate, and a body, and a method for manufacturing the same.

  DESCRIPTION OF SYMBOLS 100 ... Steel drum, 101 ... Body, 102 ... Base plate, 103 ... Top plate, 111 ... Large plug, 112 ... Small plug, 120 ... Residual liquid pool part, 123 ... Edge part, 124 ... Inclined part, 125 ... Peripheral part , 151... Sensor, 155.

Claims (2)

A method of manufacturing a metal drum (100) having a metal top plate, a base plate, and a body, wherein the top plate has a large stopper (111) and a small stopper (112),
Before winding the base plate around the body, a residual liquid reservoir (1
20)
Here, the residual liquid reservoir portion is formed by fixing the residual liquid reservoir portion in a state in which the base plate is supported in a state where the peripheral portion (125) of the base plate is fixed and the inner side of the base plate can bend more than the peripheral portion. Made by pressing to form,
A method for producing a metal drum. The seam weld (101a) of the body is detected by a sensor (151),
Positioning the large plug and the residual liquid reservoir located opposite to each other and the detected seam welded portion at a predetermined position in the circumferential direction (101b) of the trunk;
The method of manufacturing a metal drum can according to claim 1 , wherein after the positioning, the body, the top plate, and the base plate are wound with a winding device (155).

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