KR101689506B1 - welding seamless LPG Cylinder and manufacture apparatus - Google Patents

Abstract

The present invention relates to a liquefied petroleum gas container with no welding joint, and an apparatus for manufacturing the same. More specifically, a metal sheet is molded and manufactured to be a hollow container with no welding joint through a press process and a drawing process. Moreover, a container body is smoothly withdrawn from first and second processing molds and a first fixing mold during the press process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied petroleum gas (LPG)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied petroleum gas container having no welded joint and a manufacturing apparatus thereof, and more particularly, to a liquefied petroleum gas container having a welded joint, The present invention relates to a liquefied petroleum gas container free of welding seam and a device for manufacturing the liquefied petroleum gas container so that the drawing of the container can be smoothly performed from the first and second fixed molds.

Generally, vessels for receiving liquefied petroleum gas (propane, butane, etc.) are made by welding steel.

However, the container made by welding has a problem that the peripheral portion of the welded joint is easily corroded as compared with other portions of the welded joint, and there is a high risk of explosion accident due to gas leakage.

A Korean Patent Registration No. 10-0935575 (Jan. 1, 2010) discloses a liquefied petroleum gas container having no welded joint and an apparatus for manufacturing the same.

However, in the conventional apparatus for manufacturing a liquefied petroleum gas container without welding seams, the metal plate material seated on the first fixed mold during press working is formed into a container body according to the descent of the first and second processing dies, The mold can not be easily drawn out from the mold and the first stationary mold, and the work process is delayed.

Korean Registered Patent No. 10-0935575 (2010.01.07.) 'Liquefied petroleum gas container without welded joint and its manufacturing apparatus'

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a method of manufacturing a metal plate by molding and manufacturing a metal plate into a hollow vessel without welding seams through press working, And to provide a liquefied petroleum gas container free from weld seams and capable of smoothly drawing out the molten glass from the first mold and the first fixed mold.

The problems to be solved by the present invention are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above-mentioned object, the present invention provides a method of manufacturing an aluminum plate, comprising the steps of: A pressing device comprising a machining die; A second and third stationary molds in the form of a ring which are spaced from each other on the same line so as to obtain a thickness of a predetermined standard; And a third machining die which presses the first machining die so as to draw up to twice the initial length thereof; A neck molding device for heating and pressing the periphery of the opening of the semi-finished product container formed by the drawing device to make the spout of the container; A surface welding device for forming a protector for protecting the on-off valve on the spout formed at the upper end of the container, and a skirt for forming the container at the lower end, respectively; A heat treatment device for heat treating the container; And a tap forming device for forming a thread in the spout of the heat treated container, wherein the first machining die has a cylindrical shape having a diameter larger than the outer diameter of the first stationary forming die, And the second machining die is formed in a columnar shape having a diameter smaller than the inner diameter of the first stationary forming die and is lowered together with the first machining die, The apparatus for manufacturing a liquefied petroleum gas container according to any one of claims 1 to 3, wherein the first and second fixed molds And a separating unit for separating the container body, wherein the separating unit is provided inside the first stationary forming die, and when the first and second processing dies are lifted and lowered, And a pressing means for pressing the upward direction so as to be separated from the container body is first fixed forming die; A sensing sensor for detecting the elevation of the first machining die; And a control unit for controlling the pressing unit to move up and down according to a detection signal of the detection sensor.

The pressurizing means according to the present invention is composed of a cylinder, and the separating portion is connected to the pressurizing means so as to be located inside the first stationary forming die, while being lifted and lowered by the driving of the pressurizing means, A pressure plate for pressurizing; And a limit switch provided on the pressure plate to stop driving of the first and second machining dies under the control of the controller while being turned off by contact with the tool body, And the limit switch is turned on as the container body is fed from the pressure plate, so that the pressing unit is driven to be lowered.

The lifting and lowering prevention unit may further include a support ring connected to the outer circumferential surface of the second machining metal mold to prevent the container body from being lifted and lowered together with the first and second machining dies lifted and lowered. And a plurality of auxiliary pressing means provided in the supporting ring for pressing the supporting body against the first fixed molding die from a state in which the supporting body contacts the elevating and lowering of the second processed metal mold, A plurality of pressure bars coupled to the support ring so as to be movable up and down, and having upper and lower plates at upper and lower ends thereof; And a plurality of springs connected to the pressure rods so as to be positioned between the lower plate and the support ring.

There is provided a welded joint-free liquefied petroleum gas container characterized by being manufactured by the manufacturing apparatus according to the present invention.

According to the present invention, it is possible to form and manufacture a metal plate into a hollow container having no welded joints through press working, drawing work, etc., thereby achieving an improvement in work efficiency and an improvement in stability.

Further, since the drawing of the molten metal from the first and second fixed molds and the first and second fixed molds can be performed smoothly during press working, it is expected that the work process can be smoothly performed and the work efficiency can be improved.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

Figs. 1A to 1E are views showing press working using a press apparatus in an apparatus for manufacturing a liquefied petroleum gas container without welding seams according to the present invention. Fig.
FIGS. 2A to 2C are diagrams illustrating drawing drawing processing using a drawing drawing apparatus in an apparatus for manufacturing a liquefied petroleum gas container without welding seams according to the present invention.
FIG. 3A or 3B is a view showing a necking molding apparatus in an apparatus for manufacturing a liquefied petroleum gas container without a welded joint according to the present invention.
4 is a view showing a heat treatment apparatus in an apparatus for manufacturing a liquefied petroleum gas container without welding seam according to the present invention.
5 is a view showing a welding state in an apparatus for manufacturing a liquefied petroleum gas container without welding seam according to the present invention.
6 is a view showing a state in which a liquefied petroleum gas container without a welded joint according to the present invention is tapped.
FIG. 7 is a view showing a state where a separating unit and a lifting / lowering preventing unit are provided in an apparatus for manufacturing a liquefied petroleum gas container without welding seam according to the present invention.
And,
FIG. 8 is a view showing the operating state of the separator in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And should not be construed as limited to the embodiments described herein.

Since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein.

It should be understood that the embodiments according to the concept of the present invention are not limited to the particular mode of disclosure but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

Since the present invention uses the following Japanese Patent Application No. 0935575 as it is, the features of the device configuration described below can be understood as described in Patent Registration No. 0935575. [

However, the present invention further includes a structure for smoothly separating the container body from the first stationary mold of the structures disclosed in the above-mentioned Japanese Patent No. 0935575 and a description of its operation, .

Therefore, the device structure, characteristics and operation relationship described below will be referred to as the contents of the above-mentioned Japanese Patent Application No. 0935575, and the configuration related to the main features of the present invention will be described in detail at the rear end.

1 to 6, an apparatus for manufacturing a liquefied petroleum gas container without welding seam according to the present invention includes a press apparatus 100, a drawing drawing apparatus 200, a neck forming apparatus 300, a surface welding apparatus 400, a heat treatment apparatus 500, and a tap processing apparatus 600.

1A to 1E, the press apparatus 100 is provided with a first fixing mold 110 for raising a disc-shaped metal plate 10 annealed by a pre-treatment process, A first machining metal mold 120 and a second machining metal mold 130 having a cylindrical shape on the upper side of the stationary forming mold 110 are installed on the same axis.

The first fixed mold 110 has a cylindrical shape and the first upper mold 120 has a cylindrical shape having a diameter larger than the outer diameter of the first stationary mold 110, (130) has a cylindrical shape that is the same as or smaller than the inner diameter of the first stationary mold (110).

The first and second machining dies 120 and 130 are installed on the same axis and after the operation of the first machining dies 120, Lt; RTI ID = 0.0 > 120 < / RTI >

The first and second machining dies 120 and 130 are operated by a hydraulic device (not shown).

2A and 2B, the drawing apparatus includes a plurality of bending units 20a bendable by the press apparatus 100, the plurality of bending units 20 being spaced from each other on the same line so as to obtain a predetermined thickness. 2 fixed mold frame 210 and a third fixed mold frame 220.

2B, the second stationary mold 210 is formed to have a sloped surface 211 having a larger diameter and gradually smaller diameter.

The drawing drawing apparatus is installed on the second and third stationary forming molds 210 and 220 and is configured to draw out the circular arc-shaped member 20 passing through the second and third stationary forming molds 210 and 220 up to twice as much as the first length And a third processing tool 140 for pressing.

The diameter of the third machining die 140 may be smaller than the inner diameter of the third stationary die 220.

4A, the neck forming apparatus 300 is rotated at a high speed in a state of being heated to about 450 to 470 DEG C by using the heating device 310, and is then pressed against the outer peripheral surface of the container as shown in FIG. 4B And the spiral 21 is formed by gradually pressing the rotating roller 320 inwardly.

5, the surface welding apparatus 400 is provided with a protector 410 for protecting the open / close valve on the upper end of the finished container, and a skirt 420 for fixing the container at the lower end thereof, respectively .

The heat treatment apparatus 500 is quenched after 4 hours of solution treatment in a furnace heated to approximately 520 to 525 캜, and aged hardening treatment is performed for 8 hours to complete a high-strength metal container.

The completed container is quenched for 4 hours by the solution treatment in the furnace heated to approximately 520 to 525 ° C by the heat treatment apparatus 500, and aged for 8 hours to complete the high-strength metal container.

The tapping device 600 allows the thread 21a to be formed in the spout 21 of the heat-treated container.

Since the tapping device has a general shape, a detailed description thereof will be omitted.

The procedure of manufacturing the liquefied petroleum gas container without welding seam of the present invention will be described below with reference to the apparatus constructed as above.

First, simultaneous press working is prepared through a pretreatment step in which the annealed metal sheet 10 is processed into a disc shape.

First, when the metal plate 10 manufactured through the preprocessing process is placed on the first stationary mold 110 as shown in FIG. 1A, the first metal mold 120 is vertically lowered to form the metal plate 10, As shown in FIG. 1B, while descending sequentially as shown in FIG. 1C. At the same time, when the second machining metal mold 130 vertically descends and is vertically compressed, the cylindrical metal body 20 are fabricated.

The first machining metal mold 120 forms an outer wall of the metal body 20 and the second machining metal mold 130 forms the outer wall of the tool body 20 20 are formed. The inner and outer walls are integrally connected to each other to form the container body 20.

As shown in FIGS. 2A and 2B, the cylindrical shaped container obtained by the press working is reduced in thickness through the second fixed molding die 210 and compressed through the third machining die 140 to have a long length And then drawing is performed by passing through the third stationary mold 220 so as to have a constant thickness.

The molten metal that has undergone the drawing drawing process forms the spout 21 through a necking process.

As shown in FIG. 4A, after the opening of the container is rotated at a high speed, the necking process is heated to 450 to 470 DEG C, which is the proper temperature for processing, using the heating device 310, The rotating rollers 320 are gradually moved inward to form a spout portion.

As shown in FIG. 5, the container body having been subjected to the necking process is welded to the upper and lower portions of the container by welding the protector 410 and the skirt 420, respectively, to complete the shape of the container.

As shown in FIG. 6, the container completed by the above welding process was quenched in a heat treatment furnace heated to 520 to 525 ° C for 4 hours and then subjected to aging hardening treatment for 8 hours By passing through the treatment process, it becomes a high-strength container.

Then, as shown in Fig. 6, the tapered groove 21a is formed on the inner peripheral surface of the spout portion.

The product can be finally produced through a post-treatment process such as washing or painting.

7 to 8, the pressing device 100 is moved from the first fixed molding die 110 to the supporting body 20 (see FIG. 7) The separator 700 is further configured to be separated.

The separating unit 700 is provided inside the first fixing mold 110 and presses the container body 20 upward in accordance with the elevation of the first and second processing dies 120 and 130, And a pressing means 710 for separating the container body 20 from the stationary forming die 110.

This is because the tool body 20 is formed into a double walled body having inner and outer walls 22 and 23 by the downward driving of the first and second processing dies 120 and 130 and the inner and outer walls 22 and 23, The first stationary mold 110 is located between the first stationary mold 110 and the second stationary mold 110 and is not easily drawn out from the first stationary mold 110.

It can be understood that the elevation of the first and second machining dies 120 and 130 is performed in order to form the next metal plate from the state where the metal plate 10 is formed into the metal body 20 by descending.

The separation unit 700 can smoothly separate and withdraw the container body 20 from the first stationary mold 110 before the elevated first and second processing dies 120 and 130 descend again .

The pressing means 710 comprises a cylinder of a general shape and presses the container body 20 in the form of being fitted around the upper end of the first stationary mold 110 in the upward direction, To be separated from and drawn out from the first stationary mold 110.

The separating unit 700 is connected to the upper portion of the pressing unit 710 and presses the pressing unit 720 while pressing and pressing the container body 20 while being lifted and lowered in accordance with the driving of the pressing unit 710 .

The presser plate 720 may have the same outer circumference as the inner circumferential surface of the first stationary mold 110.

The pressing plate 720 is made of metal, and the upper surface thereof may be provided with a buffer member 721 made of rubber or silicone.

This is to prevent the impact caused by the pressure applied to the container body 20 by the pressure plate 720 from being absorbed while preventing the container body 20 from slipping.

The separation unit 700 includes a detection sensor 730 and a detection sensor 730 which are fixed to other structures so as to be positioned on the upper portion of the first processing metal mold 120 and sense the elevation of the first processing metal mold 120, And a control unit 740 for controlling the pressing unit 710 to be driven according to a detection signal of the pressing unit 710.

The detection sensor 730 preferably detects when the first machining metal mold 120 reaches a height at which it is no longer raised or lowered, that is, a maximum height, and can take various known configurations.

The separator 700 is provided on the pressure plate 720 and is pressed or turned off by the contact with the container body 20 so that the first and second processing dies 700, And a limit switch 750 for stopping the driving of the switches 120 and 130.

The control unit 740 stops the first and second machining dies 120 and 130 according to the OFF state of the limit switch 750 so that the drawer drawing apparatus 200) and the like.

The limit switch 750 is pressed down or turned on as the container body 20 is conveyed from the pressure plate 720 and is driven to descend the pressing means 710 under the control of the controller 740, .

The pressing plate 720 is lowered according to the downward driving of the pressing means 710 so that another metal plate 10 can be raised on the upper portion of the first fixing forming die 110.

The controller 740 can drive the first and second machining dies 120 and 130 according to the ON state of the limit switch 750.

As shown in FIG. 7, the first and second machining dies 120 and 130 are formed by forming the metal plate 10 into the metal body 20, And an elevation preventing unit 800 for preventing the vessel body 20 from moving up and down together.

The lifting and lowering prevention unit 800 includes a support ring 810 connected to the outer circumferential surface of the second machining metal mold 130 and a plurality of the support rings 810, And auxiliary pressure means (820) for pressing the container body (20) from the state where the container body (20) is in contact with the first stationary mold (110).

The auxiliary pressing means 820 includes a plurality of pressing rods 821 and upper and lower plates 821a and 821b which are vertically movably coupled to the supporting ring 810 and have upper and lower plates 821a and 821b, And a plurality of springs 822 connected to the pressure bar 821 so as to be positioned between the support rings 810.

The lower plate 821b is positioned above the lower portion of the second machining die 130. In other words, before the lowering of the second machining die 130 is stopped, the molding of the inner wall body 22 is finished It is preferable to arrange such that it is in contact with the above-mentioned container body 20. [ This is to prevent the molding of the container body 20 as much as possible.

The pressing rod 821 is moved upward while the lower plate 821b is in contact with the container body 20 as the first and second machining dies 120 and 130 descend.

The spring 822 is contracted as the lower plate 821b is moved toward the support ring 810. [

As the first and second machining dies 120 and 130 are lifted and lowered, the contracted spring 822 slackens and presses the support body 20 to the first stationary mold 110, Is not moved up and down together with the first and second machining dies 120 and 130.

The elastic force of the spring 822 is preferably such that the elastic body 20 is not lifted and lowered together with the first and second machining dies 120 and 130 according to the relaxed state from the contracted state.

Accordingly, the lifting / lowering prevention unit 800 can prevent the lifting body 20 from moving up and down together with the elevation of the first and second processing dies 120 and 130.

It is to be understood that the present invention is not limited to the above-described embodiment, but may be applied to other types of liquefied petroleum gas It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

10: metal plate 20:
21: spout 22: interior wall
23: outer wall 100: press device
110: first fixed mold 120: first mold
130: second machining die 140: third machining die
200: Drawing drawing device 210: Second fixing mold frame
220: second fixed forming die 300: neck forming device
400: Surface welding apparatus 500: Heat treatment apparatus
600: tapping device 700: separating part
710: pressure means 720: pressure plate
730: Detection sensor 740:
750: Limit switch 800:
810: Support ring 820: Auxiliary pressurizing means
821: pressure rod 821a: top plate
821b: lower plate 822: spring

Claims (4)

A pressing device comprising a cylindrical first fixed mold for raising a disk-shaped aluminum plate and first and second working dies operated by an axis on the same center line of the first stationary mold;
A second and third stationary molds in the form of a ring which are spaced from each other on the same line so as to obtain a thickness of a predetermined standard; And a third machining die which presses the first machining die so as to draw up to twice the initial length thereof;
A neck molding device for heating and pressing the periphery of the opening of the semi-finished product container formed by the drawing device to make the spout of the container;
A surface welding device for forming a protector for protecting the on-off valve on the spout formed at the upper end of the container, and a skirt for forming the container at the lower end, respectively;
A heat treatment device for heat treating the container; And
And a tap forming device for forming a thread in the spout of the heat treated container,
Wherein the first machining metal mold
Wherein the outer wall of the container body is formed by pressing the aluminum plate material by the descent,
Wherein the second machining metal mold is formed by:
Wherein the welding seam is formed in a cylindrical shape having a diameter smaller than an inner diameter of the first stationary forming die and descends together with the first machining die to enter the first machining die to form an inner wall of the furnace body As an apparatus for producing a liquefied petroleum gas container,
Further comprising a separator for separating the container from the first stationary mold according to the elevation of the first and second processed dies,
The separator may include:
A pressing means provided on the inner side of the first stationary forming die for pressing the furnace body upward in accordance with the elevation of the first and second machining dies so that the container body is separated from the first stationary forming die;
A sensing sensor for detecting the elevation of the first machining die; And
And a control unit for controlling the pressing unit to move up and down according to a detection signal of the detection sensor,
Wherein the pressing means comprises:
Cylinder,
The separator may include:
A pressing plate connected to the pressing means so as to be positioned inside the first stationary forming die, while pressing the pressing member against the user while being lifted and lowered by the driving of the pressing means; And
And a limit switch provided on the pressure plate to stop driving the first and second machining dies under the control of the controller while being turned off by contact with the tool body,
Wherein,
Wherein the control means controls the pushing means to be driven to be lowered while the limit switch is turned on as the container body is fed from the pressurizing plate.
delete The method according to claim 1,
Further comprising an elevation preventing portion for preventing the container body from being raised and lowered together with the elevation of the first and second machining dies,
The elevating /
A supporting ring connected to an outer circumferential surface of the second machining metal mold;
And auxiliary pressurizing means provided in the support ring for pressurizing the support body from the state in contact with the support body in accordance with the ascending and descending of the second machining die,
Wherein said auxiliary pressing means comprises:
A plurality of pressure bars coupled to the support ring so as to be movable up and down, and having upper and lower plates at upper and lower ends thereof; And
And a plurality of springs connected to the pressure rods so as to be positioned between the lower plate and the support ring.
delete

Images