JP3864841B2 - Method and apparatus for manufacturing cold container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method and a manufacturing apparatus for a cold container that stores and uses ice together with an object to be stored.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, as a cold storage container that has been used for storing objects such as fresh fish, fruits and vegetables, fresh foods, medicines, etc., a means for draining ice-melted water is provided for the purpose of storing ice together with the objects to be stored. However, as a cold storage container in which wastewater does not flow out to the outside in the middle of stacked containers so that the wastewater does not contaminate the outer surface of the container during loading or transportation, for example, utility model registration No. 3043521, Kai 2000-264375 was proposed.
[0003]
However, in the case of the above cold storage container, the inner side and the outer side of the container communicate with each other through the drain port, and the temperature inside the container rises when the outside air enters the container, and the cold insulation effect is lowered and the cold insulation is reduced. There was a drawback that time was shortened.
In view of this, a container capable of water sealing the drain outlet by drainage so that the inner side and the outer side of the container are not connected and a method for manufacturing the same have been proposed as Japanese Patent Laid-Open No. 6-56176. In the case of this cold storage container, the drain outlet is sealed with water to prevent the outside air from entering the container and the cooling effect is enhanced, but when forming the water guide hole for sealing the drain outlet, A means for preventing the molding piece for forming the water guide hole from being caught at the time of mold release was necessary. As a means for that, in JP-A-6-56176, a movable molding piece is brought into close contact with the surface of the core mold at the time of mold closing with a wire connected to an air cylinder, and at the time of mold opening (at the time of mold release). Had to be moved to the inner wall of the cavity. Since the control means for such a molding piece must be attached to the outside of the mold, the space between the molds needs to be larger than usual, and the number of molded products is reduced compared to normal molding, This has resulted in a reduction in molding efficiency.
[0004]
Therefore, Japanese Patent Application No. 2001-233967 has been invented as a cold storage container, a manufacturing method and a manufacturing apparatus capable of solving all the disadvantages and inconveniences of the above prior art.
However, in the case of the Japanese Patent Application No. 2001-233967, the following problems remain as a manufacturing method and a manufacturing apparatus.
The problems will be described sequentially.
[0005]
(1) If the cracking C is increased to compensate for insufficient filling of the pre-expanded resin particles as a raw material into the cavity space 50, the gap between the molding core 90 and the contact surface 31 of the core mold 30 is increased. Since a burr | flash generate | occur | produces in the water conveyance hole connected with the drainage hole of the cold storage container shape | molded, delicate adjustment was needed (refer FIG. 7).
(2) When trying to eliminate burrs in the water guide holes, the mold core 90 and the core mold contact surface 31 need to be in close contact with each other during cracking, and the mold is closed with the gap. As a result of the molding core 90 being further pressed against the core mold contact surface 31, the contact surface angle of the molding core may change, and burrs may occur in the water guide holes. There is a risk of shifting downward from the surface 31 and breaking through the bottom surface of the container (see the chain line in FIG. 7).
[0006]
(3) Due to the dimensional variation of the molding machine and the mold mounting frame and the dimensional variation of the core mold 30 and the cavity mold 40, there is a water conduction hole (depending on the molding core and the surface of the core mold) of the cold insulation container to be molded. There is a possibility of moving from a predetermined position.
{Circle around (4)} When the molding core 90 is pushed in, a load is applied to the entire molding core, thereby reducing the durability of the molding core 90.
(5) As a result of the above reasons, the molding core 90 and the core mold contact surface 31 are difficult to be determined at the time of mold production, so that it is necessary to make an adjustment while looking at the molded product after the mold is mounted.
[0007]
In the present invention, an object of the present invention is to provide a method and an apparatus for manufacturing a cold container that have been intensively studied so as to solve the above-described problems.
[0008]
[Means for Solving the Problems]
As a method of manufacturing a cold container capable of achieving the object of the present invention, a pipe for forming a drain hole penetrating the side wall of the container so as to be positioned between the core mold and the cavity mold for forming the container. The movable pin that protrudes part from the pipe is pushed against the pressing force of the spring in the pipe when the mold is cracked, and a flexible core for forming a flexible water guide hole connected to the movable pin is inserted. Projecting from the pipe guide hole in an oblique direction, the molding core is brought into contact with the core mold, the pre-expanded particles are filled into the cavity space between the core mold and the cavity mold, and then the mold is clamped. In performing foam molding while absorbing the stress applied to the molding core abutted on the core mold to prevent the molding core from shifting, and then when the mold is opened, the movable pin is moved by a spring in the pipe. To the original The cooling core is manufactured by removing the pipe from the formed water guide hole together with the movable pin, and separating the pipe and the container, and connecting the drain hole and the water guide hole. It is said.
[0009]
According to the manufacturing method of the cold storage container of the present invention as set forth in claim 1, the drain hole penetrated through the container side wall by the molding core connected to the pipe and the pin movable in the pipe, and the water guide hole communicating with the drain hole. Thus, it is possible to smoothly form a cold storage container having the above and to manufacture a cold storage container with water guide holes in an oblique direction.
In particular, in the manufacturing method of the present invention, the movable pin is pushed against the pressing force of the spring in the pipe during cracking, and the forming core for forming a flexible water guide hole connected to the movable pin is inclined from the guide hole of the pipe. Since the molding core comes into contact with the mold in the direction, there is no gap between the molding core and the core mold contact surface even when cracking is taken to compensate for insufficient filling of the raw material. Therefore, it is possible to eliminate the possibility that burrs are generated in the water guide hole of the cold container.
[0010]
Furthermore, in the production method of the present invention, as described above, in the state where the molding core is in contact with the core mold, the pre-expanded resin particles as a raw material are filled into the cavity space between the core mold and the cavity mold, Next, when performing mold clamping, foam molding is performed while absorbing the stress applied to the molding core in contact with the core mold and preventing the molding core from shifting. The contact hole angle of the child does not change or shift, and the water guide hole can be formed in the cold storage container at an accurate position. In addition, as described above, since the stress applied to the molding core is absorbed, the load applied to the molding core can be reduced, the durability of the molding core can be maintained, and the service life of the molding core can be extended. become. Furthermore, since the molding core and the core mold contact surface can be contacted easily and accurately, there is a great advantage that the mounting adjustment to the mold is easy.
[0011]
Next, as a manufacturing apparatus used for carrying out the method for manufacturing a cold storage container, a pipe for forming a drain hole penetrating the container side wall is loaded so as to be positioned between a core mold for container molding and a cavity mold. The pipe is provided with a movable pin that is partially protruded from the pipe with a pressing force. The movable pin is connected to a flexible forming core for forming a water guide hole. A guide hole is formed to guide the molding core downward and project, and when the mold is cracked, the movable pin is pushed against the pressing force of the spring in the pipe and the molding core is inserted into the pipe. A stress absorbing means is provided for the molding core that protrudes from the guide hole and abuts the molding core against the core mold, and prevents the molding core from abutting against the core mold during clamping. When opening the mold after foam molding Rotating pin is characterized in that are configured to be pulled out from the water guiding holes formed molded core with pushed up original state at the pressing force of the spring.
[0012]
According to the manufacturing apparatus of the present invention, by connecting the molding core to the pin moving in the pipe, the drainage hole and the water guiding hole can be easily molded in the container side wall, and the molding core is filled in the mold. Since it is installed in a pipe that can be made, it is not only a very compact device for forming a water conduction hole communicating with a drain hole, but also when cracking the movable pin is pushed against the pressing force of the spring in the pipe In addition, the molding core protrudes from the guide hole of the pipe so that the molding core comes into contact with the core mold, and further, when the mold is clamped, the molding core that is in contact with the core mold is prevented from being displaced. Therefore, an excessive load load can be prevented from being applied to the molding core, and the manufacturing method and the manufacturing apparatus suitable for satisfying the effects can be obtained.
[0013]
In particular, as in the present invention described in claim 3 that depends on claim 2, if the stress absorbing means for the molding core is made of a shock absorbing member by a spring, the manufacturing apparatus is very much equipped with a stress absorbing means. It becomes easy to equip and the pipe located between the core mold and the cavity mold can be divided into two parts having a dividing line in the vertical direction as in the present invention described in claim 4 depending on claim 2 or 3 The feature of the pipe is that it is very convenient to assemble and disassemble the pipe with a movable pin, a molding core and the like.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be sequentially described below with reference to the drawings.
FIG. 1 and FIG. 2 are cross-sectional views showing a state in which cold storage containers manufactured according to the present invention are stacked. In the case of this cold storage container, ice (not shown) is contained in the container 10 together with an object (not shown). The object is accommodated and the object is cooled by ice.
In the container 10, a water guide groove 12 is formed on the container bottom side, and the water level H of the water guide groove 12 is formed to be slightly lower than the uppermost end of the container bottom part 11. As a result, the state of the object to be immersed in water is eliminated.
[0015]
In the figure, reference numeral 13 denotes a drainage hole penetrating downward from the upper end surface 14a of the side wall 14 of the container 10. The drainage hole 13 and the water introduction hole 15 communicating with the above-described water introduction groove 12 are arranged near the bottom of the container, in the figure, the side wall. 14 and the bottom portion 11. In the water introduction hole 15, the uppermost end 16 a of the introduction port 16 on the side of the water introduction groove 12 is formed to be lower than the lowermost end 17 a of the outlet port 17 on the side of the drainage hole 13. 10 is configured to be water-sealed (sealed with water) and to prevent the outside air from entering the container. With these configurations, the lowermost end 17a of the outlet 17 is at the time of water sealing. It becomes substantially equal to the water level H of the water guide groove 12.
[0016]
In the case of FIG. 2, the container 10 can be combined so that the container 10 can be covered with the lid 20 provided with the through hole 23 at a position matching the drain hole 13 provided through the side wall 14. When the containers 10 are stacked, the lid body 20 can be arbitrarily used, for example, when covering the required individual containers 10 or when covering the stacked uppermost containers 10. Even if the lid 20 is used, the waste water treatment can be performed smoothly.
The container 10 and the lid 20 are preferably made of a synthetic resin, particularly a synthetic resin foam, and the foamed synthetic resin forming the container 10 and the lid 20 is made of pre-expanded particles as a raw material. A molded article obtained by in-mold foam molding is suitable. For example, foamed polystyrene or other known foamed synthetic resins can be used.
[0017]
Next, the manufacturing method and apparatus according to the present invention for providing the above-described cold storage container will be described below.
3 to 5 show the process of forming the cold storage container. FIG. 3 shows the time when the mold is opened, FIG. 4 shows the time when cracking is performed when the raw material is charged, and FIG.
In the figure, 30 is a core mold, 40 is a cavity mold, and 50 is a cavity space between both molds. Next, 60 is a pipe for forming the drain hole 13 penetrating the side wall 14 of the container 10 described above, and is loaded so as to be positioned between the core mold 30 and the cavity mold 40. The pipe 60 is provided with a movable pin 80 that is partially protruded from the pipe 60 by the pressing force of the spring 70. The movable pin 80 is connected to a flexible molding core 90 for forming a water guide hole. A guide hole 61 for guiding the molding core 90 obliquely downward is formed in the pipe 60. A protrusion 100 that pushes the movable pin 80 downward in the figure is provided on the core mold 30 side, and the protrusion 100 resists the pressing force of the spring 70 below the pipe 60 as the core mold 30 descends. The movable pin 80 is pushed in, but when the mold is clamped, the stress applied to the molding core 90 can be absorbed by the spring 200 interposed between the protrusion 100 and the core mold 30. Reference numeral 110 denotes a set screw for attaching the protrusion 100 to the core mold 30. The core mold 30 has a contact surface 31 with the molding core 90 and a projection 32 for forming the water guide groove 12. The guide hole 61 for the molding core 90 has a contact surface 31 with the contact surface 31. Confronted. In the figure, reference numerals 62 and 63 denote setting nuts for the pipe 60. Reference numeral 71 denotes an adjusting screw shaft with a head 72 on which the spring 70 is mounted, and is screwed to the movable pin 80. The pushing distance of the movable pin 80 is controlled to control the degree of protrusion of the molding core 90. Can be fine-tuned. Further, as shown in FIG. 6, when the pipe 60 is composed of pipes 60 a and 60 b that have a dividing line in the vertical direction and can be divided into two, when the movable pin 80 with the forming core 90 is incorporated, , Dismantling when removing becomes easy.
[0018]
Next, the molding will be described. A pipe 60 for forming the drain hole 13 penetrating the container side wall 14 is loaded so as to be located in the cavity space 50 between the core mold 30 and the cavity mold 40 for forming the container. The movable pin 80 partially protruding from the pipe 60 is pushed by the protrusion 100 against the pressing force of the spring 70 in the pipe 60 when the mold is cracked, and is connected to the movable pin 80 so as to bend freely. A forming core 90 for forming a hole is projected obliquely from the guide hole 61 of the pipe 60 and brought into contact with the contact surface 31 of the core mold 30 (see FIG. 4). When the filling of the pre-foamed resin particles into the cavity space 50 between the core mold 30 and the cavity mold 40 is completed, and then the mold is clamped, the above-described molding core 90 abutted on the core mold 30 is attached. Such stress can be absorbed by the spring 200 between the core mold 30 and the protrusion 100 (see FIG. 5). The spring 200 is formed to have a larger buffering force than the spring 70. Then, when the mold is opened, the core mold 30 is released to release the pushing force of the protrusion 100 against the movable pin 80, and the movable pin 80 is pushed up to the original shape by the spring 70 in the pipe 60 and is molded together with the movable pin 80. 90 is removed from the formed water guide hole 15. Further, by separating the pipe 60 and the container 10, it is possible to manufacture by separating the cold storage container in which the drainage hole 13 is formed and the drainage hole 13 and the water guide hole 15 communicated with each other.
[0019]
In practice, the molding core 90 connected to the movable pin 80 can use a synthetic resin or a hard synthetic rubber as a flexible material, and other materials can be used as long as they have flexibility. . Further, another buffer member such as a small oil damper may be used in place of the spring 200, but the installation of the spring buffer member is simpler.
A cooling container in which the water guide holes 15 that can be made to be traces of the exit of the molding core 90 by the manufacturing method and manufacturing apparatus of the cold storage container as described above are smoothly manufactured, and the water cooling holes are being formed. Since the child can be equipped in the mold, it does not take up a lot of space as a molding die, and the apparatus space of a normal molding die can sufficiently cope with it.
[0020]
【The invention's effect】
According to the first aspect of the present invention, the manufacturing method of the cold insulation container and the manufacturing apparatus of the second aspect of the invention are characterized in that a molding core for forming a water guide hole serving as a water sealing means at the time of molding the container is formed by pressing a spring in a pipe. The water guide hole forming means is made compact by using the pressure to project from the guide hole and exit from the guide hole, and the molding core is brought into contact with the core mold during cracking. The possibility that a gap is not generated between the molding core and the core mold and burrs are generated in the water conduction hole portion of the cold insulation container to be molded is eliminated. Furthermore, in the present invention, when the mold is clamped, the stress applied to the molding core in contact with the core mold can be absorbed, so that an excessive burden is not applied to the molding core and the durability of the molding core is ensured. Is increasing. The effect of the present invention according to claim 3 is that the manufacturing apparatus is easily equipped with a stress absorbing means, and the present invention according to claim 4 has a great advantage that it is easy to equip the pipe with a movable pin and a forming core.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a stacked state of only containers.
FIG. 2 is a cross-sectional view showing a stacked state of containers with lids.
FIG. 3 is a cross-sectional view of the manufacturing apparatus showing a state before mold closing.
FIG. 4 is a cross-sectional view of the manufacturing apparatus showing the time of cracking.
FIG. 5 is a cross-sectional view of the manufacturing apparatus showing when the mold is clamped.
FIG. 6 is an exploded front view showing a pipe division form.
FIG. 7 is a cross-sectional view showing a prior art manufacturing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Container 11 Bottom part 12 Water guide groove 13 Drain hole 14 Side wall 14a Side wall upper end surface 15 Water guide hole 16 Inlet 16a Inlet upper end 17 Outlet 17a Outlet lower end 20 Lid 23 Through hole 30 Core mold 40 Cavity mold Mold 50 Cavity space 60 Pipe 61 Guide hole 70 Spring 80 Movable pin 90 Molding core 100 Projection 200 Spring

Claims (4)

A pipe for forming a drain hole penetrating the side wall of the container is loaded so that it is positioned between the core mold for container molding and the cavity mold, and a movable pin partially protruding from the pipe is used for cracking the mold. Pushing the spring against the pressing force of the spring in the pipe, the molding core for forming the flexible water guide hole connected to the movable pin is projected obliquely from the guide hole of the pipe, and the molding core is the core mold. The pre-expanded particles are filled into the cavity space between the core mold and the cavity mold, and the mold core is then subjected to stress applied to the core mold when the mold is clamped. Foam molding is performed while absorbing the mold and preventing the molding core from shifting.After that, when the mold is opened, the movable pin is pushed up by the spring in the pipe and the molding core is removed from the formed water guide hole together with the movable pin. Let it go, Method for producing a cold container and through the drainage holes and water guide hole to produce a cold container in communication by causing al to disengage the pipe and the container. A pipe for forming a drain hole penetrating the side wall of the container is installed so as to be positioned between the core mold for container molding and the cavity mold, and a part of the pipe protrudes from the pipe with a pressing force. A movable pin is provided, and a flexible forming core for forming a water conduction hole is connected to the movable pin, and a guide hole is formed below the pipe to guide the forming core obliquely downward. When the mold is cracked, the movable pin is pushed against the pressing force of the spring in the pipe, and the molding core is projected from the guide hole of the pipe to bring the molding core into contact with the core mold. In addition, when the mold is clamped, a stress absorbing means is provided for the molding core to prevent the molding core that is in contact with the core mold from being displaced. When the mold is opened after foam molding, the movable pin is brought into its original shape by the pressing force of the spring. And pushed up Cold container manufacturing apparatus characterized by a water conducting hole formed shape core are configured to be pulled out. 3. The apparatus for manufacturing a cold-insulated container according to claim 2, wherein the stress absorbing means for the molding core is made of a buffer member using a spring. 4. The apparatus for manufacturing a cold container according to claim 2, wherein the pipe positioned between the core mold and the cavity mold is a pipe that can be divided into two parts having a dividing line in the vertical direction.

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