JP2004202728A - Cooling apparatus for tank made of synthetic resin and cooling method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling apparatus for a tank made of a synthetic resin capable of enhancing the turnover ratio of a mold and capable of still more shortening the cooling time of the molded tank, and a cooling method using the same. <P>SOLUTION: This cooling apparatus is constituted so as to cool the tank formed into a hollow shape using a thermoplastic synthetic resin material and has fixtures (3 and 4) equipped with shape holding members (24) coming into contact with the outer surface of the tank (1) taken out of a mold at the lowest limit self-retainable temperature slightly lower than the melting point of the synthetic resin material, shower nozzles (12 and 13) for spraying a cooling liquid on the tank mounted on the fixtures and flow means (31 and 41) for allowing cooling air to flow into the tank, to cool the outside of the tank with the cooling liquid while cooling the inside thereof by air. Since the tank can be taken out of the mold at a temperature markedly higher than a conventional temperature by this constitution, the turnover ratio of the mold can be enhanced. Further, since buoyancy or water pressure is not applied by spraying the cooling liquid on the outside of the tank, the occurrence of strain can be suppressed. Since the inside of the tank is cooled by air, a cooling time can be still more shortened. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for cooling a hollow tank made of a thermoplastic synthetic resin material used as a fuel tank of an automobile or a ship.
[0002]
[Prior art]
Recently, a hollow tank formed by blow molding of a thermoplastic synthetic resin material or the like has been generally used as a fuel tank for automobiles and ships. In this blow molding method, a molten resin material extruded from an extruder is sandwiched between a mold and a mold clamping machine, blown with compressed air to expand the molten resin material, transferred to the inner surface of the mold, and further cooled. is there.
[0003]
Conventionally, the tank (molded product) taken out of the mold is cooled in the mold until the tank is sufficiently hardened so as not to be deformed even when an external force is applied. Therefore, the cycle time of the mold tends to be long, and it has been difficult to increase the rotation rate of the mold to increase the productivity.
[0004]
As a method for avoiding such inconvenience and increasing the rotation rate of the mold, for example, as disclosed in Japanese Patent Application Laid-Open No. 06-328551, a refrigerant is injected into a parison before opening the mold, and molding is performed. 2. Description of the Related Art There is known a technique for shortening a cooling time of a product in a mold.
[0005]
[Patent Document 1]
JP 06-328551 A
[Problems to be solved by the invention]
However, according to the above-described conventional technology, the mold structure is complicated, and the equipment cost tends to increase.In addition, when a liquid is used as the refrigerant, it is troublesome to remove the refrigerant attached to the molded product. is there.
[0007]
Known methods for further cooling the tank to the extent that secondary processing is possible after removal from the mold include cooling the tank by submerging it in a water tank and injecting cooling water into the tank. However, the former is concerned that the tank may be distorted due to buoyancy and water pressure, and the cooling efficiency is so low that fresh water does not always come into contact with the tank by causing water flow or shaking the product Has the drawback that it does not increase. Although the latter method is excellent in shortening the cooling time, it has a drawback that it takes a long time for drainage, so that it is not advantageous in terms of increasing productivity as a whole.
[0008]
The present invention has been devised to solve such problems of the prior art, and its main objects are to increase the rotation rate of the mold and to further shorten the cooling time of the molded tank. It is an object of the present invention to provide a synthetic resin tank cooling device and a cooling method which can be performed.
[0009]
[Means for Solving the Problems]
In order to achieve such an object, in claim 1 of the present invention, an apparatus for cooling a hollow tank made of a thermoplastic synthetic resin material is provided with a minimum self-maintenance slightly lower than the melting point of the synthetic resin material. A jig (3.4) having a shape holding member (24) circumscribing a tank (1) taken out of a molding die at a formable temperature, and a shower nozzle for spraying a cooling liquid to a tank mounted on the jig (12, 13) and means (31, 41) for flowing cooling air to the inside of the tank. The outside of the tank is liquid-cooled, and the inside is air-cooled.
[0010]
By doing so, the tank can be taken out of the mold at a temperature significantly higher than in the past, so that the rotation rate of the mold can be increased. Further, in cooling by spraying a cooling liquid onto the outer surface, unlike in submergence, buoyancy and water pressure are not applied to the tank, so that generation of distortion is suppressed. Moreover, since the air is also cooled from the inside of the tank, the cooling time can be further reduced.
[0011]
In the invention of claim 2, a position adjusting function (26) is added to the shape holding member. Thus, the position of the support surface of the tank and the like can be finely set, so that a higher accuracy requirement can be satisfied.
[0012]
According to the third aspect of the present invention, the jig comprises a lower jig (3) and an upper jig (4) which are configured to be connectable / separable from each other. The jig opening / closing stage (5) for performing the joining / separating operation is arranged separately from the stage (6) for performing the cooling operation, and a jet nozzle (16) for draining air is provided between the two stages. . With this, the jig and the tank can be drained while returning to the jig opening / closing stage after the cooling operation in the cooling stage is completed, so that the cycle time can be reduced.
According to the fourth aspect of the present invention, the lower jig and the upper jig are connected to each other by a slide member (64) provided on one of the jigs so as to be movable in a lateral direction, and one end of the slide member is pivotally attached to the slide member. A pair of parallel links (65), a movable clamp member (66) connected to the other end of the parallel link, and a fixed clamp member (fixed to the other jig side so as to engage with the movable clamp member). 68), and when the slide member is moved in the lateral direction, the movable clamp member is moved up and down by the action of the parallel link to come into contact with and separate from the fixed clamp member. Thereby, the clamp / unclamp operation between the upper and lower jigs can be easily and reliably performed only by moving the slide member.
[0014]
In the invention of claim 5, only the lower jig with the upper jig removed is moved to a position before the jig opening / closing stage to perform the loading / unloading operation of the tank with respect to the lower jig. Thereby, the loading / unloading operation of the tank to the lower jig can be performed in an open state where there is no obstacle upward, so that the operation efficiency is improved.
[0015]
In the invention according to claim 6, an apparatus for cooling a hollow tank made of a thermoplastic synthetic resin material is taken out of a molding die at a temperature at which self-shaping is possible at a temperature slightly lower than the melting point of the synthetic resin material. A jig provided with a shape holding member circumscribing the tank, and an air supply pipe (34) and an exhaust pipe (44) that can communicate with the inside of the tank through an opening provided in the tank so that cooling air can flow through the inside of the tank. Sealing means (38, 49) that can contact the outer surface of the tank around the opening; and moving means (35) that displaces the sealing means along the axis of the opening following a dimensional change accompanying cooling of the tank. ). In this way, the sealing means follows the dimensional change of the tank, so that the sealing performance is always maintained and the cooling air does not leak.
[0016]
According to the seventh aspect of the present invention, in addition to the above-mentioned structure, means (47, 54) for forcibly pressing the sealing means around the opening is provided. Thereby, high sealing performance can be ensured even when the opening surface is not horizontal.
[0017]
In the invention of claim 8, the method of cooling the hollow tank made of the thermoplastic synthetic resin material is performed by removing the tank from the molding die at a temperature that is slightly lower than the melting point of the synthetic resin material and at least a temperature at which self-shaping is possible. A cooling method is characterized in that a cooling liquid is sprayed to the outside of the tank while cooling air is circulated inside while being attached to a jig provided with a shape holding member circumscribing the tank.
[0018]
In this case, since the cooling liquid is sprayed to the outer surface to cool, the buoyancy and water pressure such as submersion do not need to be applied to the tank, and the generation of distortion is suppressed. Moreover, the cooling time can be further reduced by air cooling from the inside of the tank.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[0020]
FIG. 1 shows a schematic configuration of a cooling device for a synthetic resin fuel tank according to the present invention. This cooling device includes a load / unload stage 2 for loading and unloading a tank 1 which is a molded product taken out of a mold (not shown), and a tank for a lower jig frame 3 and an upper jig frame 4. 1 comprises a jig frame opening / closing stage 5 for performing a fixing operation, and a cooling stage 6 for performing a cooling operation for the tank 1 while being fixed to the upper and lower jig frames 3 and 4. The tank 1 fixed to the upper and lower jig frames 3 and 4 is pulled on a rail 7 extending between the load / unload stage 2 and the cooling stage 6 by, for example, a link chain (not shown). It is reciprocated by one driven carriage 8.
[0021]
The jig frame opening / closing stage 5 includes a lifting device using, for example, an air cylinder for vertically moving the upper jig frame 4 holding the tank 1 in cooperation with the lower jig frame 4 fixed on the carriage 8. 9 and a clamp / unclamp device 10 using, for example, an air cylinder for driving a clamp mechanism (described in detail later) that couples the upper jig frame 4 to the lower jig frame 3. At the lower end of the lifting / lowering device 9, a gripping device 11 using, for example, an air cylinder for gripping the upper jig frame 4 is provided.
[0022]
The cooling stage 6 has an upper shower nozzle 12 for injecting cooling water downward from above, a lower shower nozzle 13 for injecting cooling water upward from below the rail 7, and cooling dropped from both upper and lower shower nozzles 12. A cooling water tank 14 for receiving and storing water and a circulation pump 15 for pumping cooling water pumped from the cooling water tank 14 to both upper and lower shower nozzles 12 and 13 are provided. The cooling stage 6 is preferably configured as a shower booth whose periphery is surrounded by a waterproof wall in order to prevent water from scattering. Further, since the cooling water absorbs heat from the tank 1 and rises in temperature, it is preferable to cool the cooling water through an appropriate heat exchanger.
[0023]
Between the jig frame opening / closing stage 5 and the cooling stage 6, there is provided a drainer 16 composed of an air nozzle for blowing high-pressure air for blowing off water droplets from the tank 1 held in the upper and lower jig frames 3.4. Have been.
[0024]
As shown in FIG. 2, the lower jig frame 3 and the upper jig frame 4 are composed of frames 21 and 22 made of lightweight steel or aluminum, a base 23 made of a steel plate or an aluminum plate, and a tank 1. And a plurality of shape holding members 24 that come into contact with each other. Here, each of the shape holding members 24 is bolted to the base 23 or to a bracket 25 fixed to the frames 21 and 22 through long holes, or a shim sandwiched between the base 23 and the shape holding member 24. The position can be appropriately adjusted by changing the thickness or using a position adjusting device 26 to which a screw jack or an air cylinder is applied. In particular, in the case of a fuel tank for an automobile, since a relatively high positional accuracy is required for a mounting surface with respect to a vehicle body and a mounting surface of an auxiliary component such as a fuel pump or a vent valve, the shape holding member 24 contracts after cooling. Are provided with emphasis on positions corresponding to these parts in consideration of the above.
[0025]
Although not shown in FIG. 2, a supply device and a discharge device for cooling air in the tank are provided at appropriate places of the upper jig frame 4.
[0026]
As shown in FIG. 3, the cooling air supply device 31 includes a linear air supply pipe 34 in which an air supply nozzle 32 and a tank contact member 33 are integrally connected, and a linearly slidable air supply pipe 34. A slide bearing 35 to be held is provided, and a portion of the slide bearing 35 is fixed to a part of the frame 22 constituting the upper jig frame 4 via an appropriate bracket 36. Thereby, the tank abutting member 33 can move up and down within a predetermined range with respect to the upper jig frame 4. The air supply nozzle 32 is configured to generate turbulence by injecting cooling air in multiple directions, and is temporarily opened at the center of a portion to be a mounting portion of a fuel pump formed in the tank 1. The tank 37 protrudes into the tank 1 from the hole 37.
[0027]
An elastic seal member 38 such as an O-ring is mounted on the outer peripheral side of the tank abutting member 33, and the seal member 38 abuts on a substantially horizontal seat surface 39 of a portion to be a mounting portion of the fuel pump or the like. It is made to touch. In addition, the weight of the linearly slidable portion including the air supply nozzle 32, the tank contact member 33, and the air supply pipe 34 is set to such an extent that the sealing performance can be secured without deforming the seat surface 39 of the tank 1. Have been. As a result, the tank contact member 33 integral with the air supply nozzle 32 follows the displacement of the seat surface 39 due to the cooling of the tank 1 by its own weight, so that the seal member 38 always contacts the seat surface 39. The cooling air that comes into close contact with the inside of the tank 1 from the air supply nozzle 32 is prevented from leaking.
[0028]
As shown in FIG. 4, the cooling air discharge device 41 includes, for example, a tank contact member 43 and an exhaust passage member 44 that contact an inclined surface 42 formed in a tank so as to be a connection portion of a filler pipe, and connect these to their terminals. , A slide bearing 46 for supporting the slide rod 45 slidably in a linear manner, and an actuator 47 using, for example, an air cylinder for driving the slide rod 45 in the axial direction. 47 is fixed to a part of the frame 22 constituting the upper jig frame 4 via an appropriate bracket 48. Thus, the tank contact member 43 integral with the exhaust passage member 44 can be moved on an axis inclined at a predetermined range with respect to the upper jig frame 4.
[0029]
The tank contact member 43 has an elastic seal member 49 such as an O-ring mounted on the outer peripheral side thereof and is coupled to the exhaust passage member 44 via an automatic alignment mechanism 50. When the member 43 is pressed against the inclined surface 42 of the tank 1, the seal member 49 closely contacts the inclined surface 42. The exhaust passage 51 of the exhaust passage member 44 communicates with a hole 52 having a diameter substantially equal to the inner diameter of the exhaust passage 51 temporarily formed on the inclined surface 42. In addition, it is preferable to connect an elbow or the like to the exhaust passage 51 and open the exhaust port at a position where cooling water to be showered hardly enters.
[0030]
A compression coil spring 54 is contracted at the connection between the piston rod 53 and the slide rod 45 of the actuator 47. The pressing force generated by the coil spring 54 is set to such an extent that the sealing performance can be secured without deforming the inclined surface 42 of the tank 1. Accordingly, when the tank contact member 43 is brought into contact with the inclined surface 42 of the tank 1 while pressing and contracting the coil spring 54 by the thrust in the contracting direction of the actuator 47, the inclined surface 42 accompanying the cooling of the tank 1 is formed. Since the displacement (mainly in the contraction direction) can be followed, the tank abutting member 43 is always in close contact with the inclined surface 42, and the cooling water to be showered is prevented from entering the tank 1.
[0031]
Clamp mechanisms for coupling the upper jig frame 4 to the lower jig frame 3 are provided on both front and rear surfaces of the upper and lower jig frames 3.4. The clamp mechanism 61 includes a slide plate 64 slidably supported by a slide support member 63 fixed in place on a lateral member 62 which is a part of the frame 22 of the upper jig frame 4, and a lower end thereof. A movable clamp member 66 connected to the left and right ends of the slide plate 64 with a pair of parallel links 65 pivotally attached to the slide plate 64, and a left and right end of a horizontal member 67 which is a part of the frame 21 of the lower jig frame 3. And a fixed clamp member 68 fixed to the movable portion so as to be engageable with the movable clamp member 66.
[0032]
The clamp / unclamp device 10 for driving the clamp mechanism 61 includes a slide plate drive actuator 70 using an air cylinder that is pivotally attached at one end to a fixed bracket 69 and that can freely tilt, for example, and a slide plate drive actuator 70. A shift actuator 71 using, for example, an air cylinder for shifting the free end side up and down. At the tip of the piston rod 72 of the slide plate drive actuator 70, a gripping claw 74 is provided which can be engaged with and disengaged from a striker 73 provided at one end of the slide plate 64. The two clamp / unclamp devices 10 are provided on diagonal columns of the columns set up at the four corners of the jig frame opening / closing stage 5, and are provided on both front and rear surfaces of the upper jig frame 4. The provided slide plates 64 are driven in directions opposite to each other.
[0033]
Next, the procedure for cooling the synthetic resin tank by the apparatus of the present invention will be described.
[0034]
The hot tank 1 immediately after being taken out of the mold is placed on the lower jig frame 3 fixed to the carriage 8 waiting on the load / unload stage 2, and the jig adjacent to the jig is moved by moving the carriage 8. It is sent to the frame opening / closing stage 5. Here, the loading / unloading stage 2 is located on the front side of the jig frame opening / closing stage 5 and its upper part is open, so that the tank 1 is put into the lower jig frame 3 and taken out. Can be easily performed.
[0035]
When the carriage 8 that has moved from the loading / unloading stage 2 stops at a predetermined position on the jig frame opening / closing stage 5, first, the upper part gripped by the gripping device 11 provided at the lower end of the elevating device 9. The jig frame 4 is lowered above the tank 1 on the lower jig frame 3. In this state, the clamp mechanisms 61 of the upper and lower jig frames 3 and 4 are in the unclamped state (the state shown in FIG. 5), and the slide plate driving actuator 70 of the clamp / unclamp apparatus 10 does not interfere with the clamp mechanism 61. It is in the upward shift position (the position shown by the imaginary line in FIG. 5).
[0036]
Next, after the slide plate drive actuator 70 is contracted, the shift actuator 71 is extended to shift the slide plate drive actuator 70 downward, and the gripping claw 74 at the tip is moved to the striker at the end of the slide plate in the unclamped state. 73 (see FIG. 5). When the slide plate driving actuator 70 is extended in this state, the slide plate 64 moves rightward, and accordingly, the side protrusion of the lower end of the movable clamp member 66 located below because the parallel link 65 is tilted. 75 enters below the fixed clamp member 68 fixed to the lower jig frame 4. When the movable clamp member 66 comes into contact with the left side surface 81 of the slide support member 63 as the slide plate 64 further moves laterally, the slide plate 64 further moves to the right while the movable clamp member 66 stops there. The parallel link 65 whose lower end is pivotally attached to the plate 64 rises vertically, and the movable clamp member 66 is lifted up with this, and the lateral projection 75 engages with the fixed clamp member 68 (see FIG. 6). Thereby, the lower jig frame 3 and the upper jig frame 4 are mutually connected. In this state, the movable clamp member 66 is sandwiched between the left side surface 81 of the slide support member 63 and the stopper member 80 fixed to the front surface of the slide plate 64, so that the clamped state is stably held. In the above description, the clamp mechanism 61 provided on the load / unload stage 2 side, that is, on the front surface, has been described, but a similar mechanism is also provided on the cooling stage 6 side, that is, on the back surface.
[0037]
Next, the shift actuator 71 is contracted while the slide plate drive actuator 70 is extended to shift the slide plate drive actuator 70 upward, and the gripper 74 is removed from the striker 73 at the end of the slide plate. At the same time, the gripping device 11 at the lower end of the lifting device is removed from the upper jig frame 4 and only the gripping device 11 is raised to a position where it does not interfere with the upper jig frame 4.
[0038]
The cooling air supply device 31 and the cooling air discharge device 41 installed on the upper jig frame 4 are brought into contact with the corresponding portions of the tank 1 in parallel with the above clamping process.
[0039]
In this state, cooling air is supplied into the tank 1 to circulate cool air through the tank 1 and the tank internal pressure is maintained higher than the atmospheric pressure. The contact with the shape holding member 24 is maintained, and the sealing performance of the contact surfaces of the cooling air supply device 31 and the cooling air discharge device 41 is secured. Then, the tank 1 is transferred to the cooling stage 6 in this state.
[0040]
When the tank 1 and the carriage 8 enter the cooling stage 6 from the jig frame opening / closing stage 5, cooling water is sprayed from the upper and lower shower nozzles 12 and 13 for a predetermined time to cool the outer surface of the tank 1. Here, the timing of the cooling water injection may be synchronized with the movement of the bogie 8, or if there is a concern that the cooling water splashes due to the shape of the tank 1 or the jig frames 3 and 4, the inside of the cooling booth may be used. After stopping at a predetermined position and closing the waterproof door, cooling water injection from the shower nozzles 12 and 13 may be started.
[0041]
In this way, if cooling is performed by spraying cooling water on the outer surface of the tank 1, unlike immersion in water or the like, buoyancy or water pressure is not applied, so that distortion of the tank 1 is suppressed. Moreover, by controlling the number and position of the outlets or the supply amount of the cooling water, it is possible to equalize the cooling state of each part according to the shape and thickness of the tank 1. In addition, by circulating fresh cold air inside the tank 1 in parallel with cooling from outside the tank 1 with cooling water, external water cooling and internal air cooling can be performed in parallel, and the cooling time required can be further reduced. It becomes.
[0042]
When the cooling of the tank 1 is completed, the carriage 8 is returned to the jig frame opening / closing stage 5. During this transfer step, high-pressure air is sprayed from a drainer 16 installed at the exit of the cooling stage 6 and around the rail 7 to remove water droplets attached to the jig frames 3 and 4 and the outer surface of the tank 1.
[0043]
If the carriage 8 returned from the cooling stage 6 to the jig frame opening / closing stage 5 stops at a predetermined position, the draining air is stopped, and at the same time, the clamp mechanism 61 between the upper and lower jig frames 3 and 4 is clamped by the above-described clamp. After unclamping in the reverse order of the process, the lifting device 9 is lowered, and the upper jig frame 4 is gripped and lifted by the gripping device 11. When the slide plate 64 moves to the left so that the unclamping operation is performed reliably, the tip 76a of the hook member 76 fixed to the slide support member 63 is pivotally connected to the movable clamp member 66 of the parallel link 65. , So that the parallel link 65 is securely tilted.
[0044]
After the upper and lower jig frames 3 and 4 are separated, the carriage 8 is returned to the load / unload stage 2, and the tank 1 is drained by blowing compressed air on the load / unload stage 2 with an air gun or the like. The tank 1 is taken out from the lower jig frame 3 and replaced with the next tank 1, and the above steps are repeated.
[0045]
【The invention's effect】
As described in detail above, according to the first aspect of the present invention, since the deformation is prevented by the shape maintaining jig, the temperature at which the tank is taken out of the molding die can be made higher than before, so that the early mold Opening is possible, and a great effect can be achieved in shortening the molding cycle time. In addition, the cooling air is circulated in the tank and air-cooled in conjunction with the liquid cooling by spraying the cooling liquid onto the outer surface, so that the generation of distortion due to the influence of buoyancy and water pressure can be eliminated, and furthermore, the cooling time required Shortening can be realized.
[0046]
In particular, by providing the shape holding member with a position adjusting function (Claim 2), the position of the support surface of the tank and the like can be finely set, so that a higher accuracy requirement can be satisfied.
[0047]
In addition, a jig opening / closing stage for connecting / separating a lower jig and an upper jig configured to be able to be joined / separated from each other is separated from the cooling stage, and a draining device is provided between these two stages ( (3) Since the jig and the tank can be drained while returning to the jig frame opening / closing stage after the cooling operation in the cooling stage is completed, the cycle time can be reduced.
[0048]
According to claim 4 of the present invention, the movable clamp member provided on one jig side moves up and down by the action of the parallel link and comes into contact with and separates from the fixed clamp member fixed on the other jig side. Therefore, the clamp / unclamp operation between the upper and lower jigs can be easily and reliably performed only by moving the slide member.
[0049]
According to the fifth aspect of the present invention, only the lower jig with the upper jig removed is moved to the front of the jig opening / closing stage, and the tank is moved to the lower jig in an open state without any upward interference. Load / unload work can be performed, so work efficiency can be improved.
[0050]
According to the sixth aspect of the present invention, the sealing means provided in the cooling air circulation device into the tank is displaced following the dimensional change accompanying the cooling of the tank, so that the sealing property is always maintained. The cooling air does not leak. Particularly, if the sealing means is forcibly pressed against the outer surface of the tank (claim 7), high sealing performance can be ensured even when the contact surface of the sealing means is not horizontal.
[0051]
According to the eighth aspect of the present invention, since the outer surface is cooled by spraying the cooling liquid and the cooling air is circulated to cool the inner surface, the tank can be cooled in a short time without causing distortion in the tank.
[Brief description of the drawings]
FIG. 1 is a schematic overall configuration diagram of a cooling device according to the present invention. FIG. 2 is a schematic configuration diagram of a jig frame. FIG. 3 is a schematic elevation view of a cooling air supply device. FIG. FIG. 5 is an explanatory view of the operation of the clamp / unclamp device in the unclamped state of the clamp mechanism. FIG. 6 is an explanatory view of the operation of the clamp / unclamp apparatus in the clamped state of the clamp mechanism.
Reference Signs List 1 tank 3 lower jig frame 4 upper jig frame 5 jig frame opening / closing stage 6 cooling stage 12 upper shower nozzle 13 lower shower nozzle 24 shape holding member 26 position adjusting means 31 cooling air supply device 41 cooling air discharge device 64 slide plate 65 parallel link 66 movable clamp member 68 fixed clamp member

Claims (8)

A device for cooling a hollow tank formed of a thermoplastic synthetic resin material,
A jig provided with a shape holding member circumscribing a tank taken out of a molding die at a temperature at which a minimum self-shaping is possible slightly lower than the melting point of the synthetic resin material,
A shower nozzle that sprays a cooling liquid onto a tank mounted on the jig,
Means for flowing cooling air to the inside of the tank,
A cooling device for a synthetic resin tank, wherein the outside of the tank is liquid-cooled and the inside is air-cooled. The cooling device for a synthetic resin tank according to claim 1, wherein the jig has a position adjusting function of the shape holding member. The jig comprises a lower jig and an upper jig configured to be coupled / separable from each other,
A jig opening / closing stage for joining / separating the lower jig and the upper jig is arranged separately from a stage for performing a cooling operation, and a jet nozzle for draining air is provided between these two stages. The cooling device for a synthetic resin tank according to claim 1 or 2, wherein: The lower jig and the upper jig have a slide member provided on one jig side so as to be movable in a lateral direction, a pair of parallel links having one end pivotally connected to the slide member, and a pair of parallel links. A movable clamp member connected to the other end, and a fixed clamp member fixed to the other jig side so as to be able to engage with the movable clamp member. 4. The cooling device for a synthetic resin tank according to claim 3, wherein the movable clamp member is moved up and down by the action of a link and is connected to the fixed clamp member by a clamp mechanism. . 5. The loading / unloading operation of the tank with respect to the lower jig by moving only the lower jig with the upper jig removed to a position before the jig opening / closing stage. 4. The cooling device for a synthetic resin tank according to 4. A device for cooling a hollow tank formed of a thermoplastic synthetic resin material,
A jig provided with a shape holding member circumscribing a tank taken out of a molding die at a temperature at which a minimum self-shaping is possible slightly lower than the melting point of the synthetic resin material,
An air supply pipe and an exhaust pipe capable of communicating with the inside of the tank from an opening provided in the tank, so as to circulate cooling air inside the tank;
Sealing means capable of contacting the outer surface of the tank around the opening,
A cooling means for displacing the sealing means along an axis of the opening in accordance with a dimensional change accompanying cooling of the tank; 7. The cooling device for a synthetic resin tank according to claim 6, wherein a means for forcibly pressing the sealing means is provided around the opening. A method for cooling a hollow tank formed of a thermoplastic synthetic resin material,
Remove the tank from the molding die at a minimum self-shaping temperature slightly lower than the melting point of the synthetic resin material,
A method for cooling a synthetic resin tank, comprising: spraying a cooling liquid on the outside of the tank while allowing the cooling air to flow inward while being attached to a jig provided with a shape holding member circumscribing the tank.

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