KR20180005897A - Method for Manufacturing Plastic Fuel Tank - Google Patents

Abstract

A manufacturing method of a plastic fuel tank of the present invention comprises: introducing an accessory (100) including a baffle into a cavity (3) of molds (1, 2) by a baffle loading pin (21); introducing a parison (200) from an upper part of the molds (1, 2) to surround the periphery of the accessory (100); closing pinch plates (10-1, 10-2) respectively at left and right lower ends of the molds (1, 2) toward a blowing pin (23); performing a pre-blowing process of blowing air into the parison (200) by the blowing pin (23); closing the molds (1, 2) to descend the baffle loading pin (21); closing pinch slide cores (7-1, 7-2) respectively coupled to the left and right lower ends of the molds (1, 2) toward a bottom portion of the parison (200) that comes out of the molds (1, 2) and pushing the baffle loading pin (21) to a lower side by a slip using an inclination plate (21a) of the baffle loading pin (21) at the same time, thereby causing a baffle loading unit (20) to be separated to perform a final blowing process of blowing air into the parison (200) again by a final blowing pin (30); and taking out the parison (200) from the molds (1, 2). Therefore, the manufacturing method according to the present invention has an advantage of manufacturing more easily a plastic fuel tank having a plastic wall manufactured from the baffle and the parison (200).

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a plastic fuel tank,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of plastic fuel tanks and, more particularly, to a method of making plastic fuel tanks with plastic walls made from baffles and parison.

Generally, plastic fuel tanks are designed to introduce parison into the cavities of a mold (or extrusion blow molding machine), and to allow the parison to contain pressurized air (or pressurized gas) in the presence of an accessory containing a baffle ). ≪ / RTI >

For example, in the method of manufacturing plastic fuel tanks by parison molding, the accessory is moved in place within the parison by using a baffle loading portion, a pair of pinch plates, a pair of pinch slide cores, . Therefore, the fabrication of plastic fuel tanks by parison molding has the advantage that the structure and shape of the baffle are not limited due to their ease of assembly with the fuel tank.

Korean Patent Publication No. 10-2009-0060809 (June 15, 2009)

However, in the plastic fuel tank manufacturing method, it is necessary to precisely control the position of the baffle loading part, the pinch plate, and the pinch slide core for air blowing in the parison molding, and at the same time, It is a difficult manufacturing method.

For this reason, in the plastic fuel tank manufacturing method, it is required to continuously improve the baffle loading pin disengagement point, the air inlet pinching plate and the pinch slide core operating point for easier manufacturing and reduction of defect rate.

Accordingly, it is an object of the present invention to provide an apparatus and a method for precisely associating a baffle loading part dropping point and an operation time point of a pinch plate and a pinch slide core in air blowing of a parison wrapped around an accessory positioned in a cavity of left and right molds, The present invention provides a method of manufacturing a plastic fuel tank having a plastic wall made of baffles and parison by dividing the air blowing into two portions before and after the baffle loading portion.

In addition, according to the present invention, when the pinch slide core for secondary blowing at the time of leaving the baffle loading portion is closed, the baffle loading pin is automatically slipped by closing the lower portion of the parison, Another object is to provide a method of manufacturing a plastic fuel tank having a plastic wall made from baffles and parison without the need for separate components for secondary blowing by descending.

A method of manufacturing a plastic fuel tank having a plastic wall made from a baffle and a parison to achieve the above object, comprising the steps of: a) introducing the accessory into a mold comprising a cavity by means of a baffle loading pin; b) the parison is introduced from the top of the mold to surround the periphery of the accessory; c) closing the pinch plate at the lower ends of the left and right sides of the mold toward the blowing pin; d) pre-blowing the air into the parison by the blowing pin; e) closing the mold and lowering the baffle loading pin; f) a pinch slide core coupled to the lower ends of each of the left and right sides of the mold is closed toward a portion of the parison that has escaped to the lower end of the mold, and a final blowing step; g) opening the mold and extracting the parison from the mold; And a control unit.

A method of manufacturing a plastic fuel tank having a plastic wall made from a baffle and a parison to achieve the above object, the method comprising the steps of: a) introducing the accessory into a mold comprising a cavity by means of a baffle loading pin; b) the parison is introduced from the top of the mold to surround the periphery of the accessory; c) closing the pinch plate at the lower ends of the left and right sides of the mold toward the blowing pin; d) pre-blowing the air into the parison by the blowing pin; e) lowering the baffle loading pin by slipping the pinch slide core along the ramp while closing the mold; f) a pinch slide core coupled to the lower ends of each of the left and right sides of the mold is closed toward a portion of the parison that has escaped to the lower end of the mold, and a final blowing step; g) opening the mold and extracting the parison from the mold; And a control unit.

The blowing pin is in the form of a cone concentric with the baffle loading pin or in the shape of a swash plate, is concentric with the baffle loading pin and is located below the final blowing pin protruding toward the mold.

And the final blowing step is characterized in that at least one or more of the final blowing pins pass through the parison from the mold and are finally blown.

The final blowing includes the final blowing pin for supplying air into the parison, and a discharge pin for discharging the supplied blowing air and the supplied air out of the mold.

When the pressure in the mold is below a certain pressure, the discharge pin is closed and is opened only when the pressure is greater than the predetermined pressure. The discharge pin is provided with a one-way valve having an elastic force.

Wherein the final blowing pin and the discharge pin penetrate through the parison, and the plastic fuel tank is taken out of the mold, and then a male screw thread and a valley are formed so as to be able to be opened and closed with a cap.

The present invention can more easily manufacture a plastic fuel tank having a plastic wall made of baffle and parison by accurately associating the timing of the baffle loading part drop-off time with the operation time of the pinch plate and the pinch slide core in air blowing.

Particularly, the present invention can improve the quality of a plastic fuel tank having a plastic wall made of baffles and parison by dividing air blowing into two portions before and after the baffle loading portion.

In addition, the present invention automatically implements the baffle loading portion dropout as a slip associated with the closing operation of the pinch slide core, thereby making it possible to manufacture a plastic fuel tank having a plastic wall made of baffle and parison even in a more simplified system configuration .

FIG. 1 is a flowchart of a method for manufacturing a plastic fuel tank according to the present invention, and FIGS. 2 to 8 are main process states for manufacturing a plastic fuel tank with a plastic fuel tank manufacturing apparatus according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

1 shows a flowchart of a method of manufacturing a plastic fuel tank according to the present invention. As shown in the figure, in the method of manufacturing a plastic fuel tank, the precise linkage between the baffle loading portion dropping point and the operation timing of the pinch plate and the pinch slide core in which the accessory is introduced from the lower portion of the mold to the hollow portion, There is an advantage that the parison molding is performed without difficulty in controlling the assembly position of the included baffle. Particularly, the close contact of the pinch slide core for air blowing at the time of leaving the baffle loading part closes the lower part of the parison, and at the same time, the baffle loading pin is automatically lowered by the slip by the pinch slide core, There is an advantage that the parison molding can be performed without difficulty in controlling the position of the baffle loading part in the subsequent secondary blowing (final blowing). As a result, plastic fuel tanks with plastic walls made from baffles and parison are produced without difficulty in baffle assembly position control and baffle loading part removal control.

2 to 8 illustrate an embodiment of the present invention for manufacturing a plastic fuel tank with a plastic fuel tank manufacturing apparatus. Referring to FIG. 2, a method of manufacturing the plastic fuel tank of FIG. 1 will be described in detail. The left and right molds 1 and 2, the left and right pinch slide cores 7-1 and 7-2, and the left and right pinch plates 10-1 and 10-2, respectively, The molds 1 and 2, the pinch slide cores 7-1 and 7-2, and the pinch plates 10-1 and 10-2, and the control is performed by the controller.

S10 is a step of opening the molds 1 and 2 to open the cavity portion 3 and S20 is a step of opening the accessory 100 to the molds 1 and 2 including the cavity portion 3 by the baffle loading pins 21. [ .

This is illustrated in FIG. As shown, the molds 1 and 2 are provided with a final blowing pin 30 and a discharge pin 40 for secondary blowing (final blowing) and open to open the cavity 3, The portion 20 is located under the molds 1 and 2. When the accessory 100 including the baffle in this state is engaged with the baffle loading pin 21, the baffle loading portion 20 is lifted at the bottom of the mold 1, . Particularly, the baffle loading unit 20 is composed of a baffle loading pin 21 for holding the accessory 100 and a blowing pin 23 for performing primary air blowing (preblowing) And the air hole of the blowing pin 23 is formed around the baffle loading pin 21. The baffle loading pin 21 is formed of a conical shape protruding from the end portion of the blowing pin 23 by forming the inclined swash plate 21a . In this state, the pinch slide cores 7-1 and 7-2 and the pinch plates 10-1 and 10-2 are kept in the standby state for operation.

S30 is a step in which the parison 200 is introduced from above the molds 1 and 2 so as to surround the periphery of the accessory 100. [ This is illustrated in FIG. As shown in the drawing, the molds 1 and 2 are opened to open the hollow portion 3, and the baffle loading portion 20 is in a state of being withdrawn from the hollow portion 3 to the lower portion of the molds 1 and 2 . The parison 200 is then discharged to the cavity 3 in the head 5 located at the top of the molds 1 and 2. When the parison 200 is discharged to the cavity 3, The loading section 20 is again raised to the cavity section 3. As a result, the parison 200 surrounds the accessory 100, and the discharge of the parison 200 is transmitted to the pinch slide cores 7-1, 7-2, (10-1, 10-2). In this state, the pinch slide cores 7-1 and 7-2 and the pinch plates 10-1 and 10-2 are kept in the standby state for operation.

In S40, the pinch plates 10-1 and 10-2 are closed toward the baffle loading portion 20 at the lower ends of the left and right sides of the molds 1 and 2, This is the stage where the blowing takes place. This is illustrated in FIG. As shown, the molds 1, 2 are open to open the cavities 3 and the accessory 100 is wrapped in the parisons 200 in the cavities 3, The loading pins 21 are held in a state of being drawn out from the blowing pins 23 and the pinch plates 10-1 and 10-2 are brought into close contact with the portions of the parison 200 descending to the blowing pins 23, (23). The bottom of the parison 200 is then sealed by being pressed in the state in which the pinch plates 10-1 and 10-2 surround the outer peripheral surface of the blowing pin 23 and then air (or pressurized gas The parison 200 is inflated into the cavity 3 of the mold 1, 2. As a result, the parison 200 can be flat against the cavities 3 by coming into tight contact with the cavity 3. In this state, the pinch slide cores 7-1 and 7-2 maintain the standby state.

S50 is a step of closing the molds 1 and 2 and lowering the baffle loading pins 21. [ This is illustrated in FIG. As shown, the molds 1 and 2 are closed to seal the cavity portion 3. The final blowing pin 30 is then positioned in the interior space of the parison 200 while piercing the stopper hole in the parison 200 due to the closing of the molds 1,2, Is positioned in the inner space of the parison (200) while piercing the other stopper hole in the parison (200). Further, the pinch slide cores 7-1 and 7-2 are brought into contact with the lower portion of the parison 200 which is exposed to the outside of the molds 1 and 2 due to the closing of the molds 1 and 2. In this state, the baffle loading pins 21 are lowered so that the baffle loading pins 21 are inserted into the inside of the blowing pins 23, so that the pinch slide cores 7-1, 200 form an airtight space sealed by the pinch plates 10-1, 10-2. In particular, the left and right pressures applied to the parison 200 when the molds 1 and 2 are closed prevent the movement of the accessory 100 without fixing the baffle loading pins 21, The assembly position of the accessory 100 can be accurately maintained during the vulcanization welding process.

Step S50-1 is a stage where the baffle loading part is removed from the slip. In this step, the pinch slide cores 7-1 and 7-2, which are in contact with the swash plate 21a of the baffle loading pin 21 on both the right and left sides, form a slip due to the inclination of the swash plate 21a, The baffle loading pins 21 are pushed downward in the process of closing the pinch slide cores 7-1 and 7-2, thereby forming a dropout of the baffle loading portion 20. [ Therefore, the baffle loading unit 20 can automatically come out of the pinch slide cores 7-1 and 7-2 in the process of coming into close contact with the lower portion of the parison 200. [

In S60, the pinch slide cores 7-1 and 7-2 located at the lower ends of the left and right sides of the molds 1 and 2 are closed toward the portion of the parison 200 that has escaped to the lower ends of the molds 1 and 2 And finally blowing the air into the interior of the parison 200 by the final blowing pin 30. This is illustrated in FIG. As shown in the drawing, the molds 1 and 2 are closed so that the parison 200 is in close contact with the cavity 3, and the lower portion of the parison 200 is in contact with the pinch slide cores 7-1 and 7-2 ). Particularly, since the pinch slide cores 7-1 and 7-2 are formed with staggered cut surfaces, the lower part of the parison 200, which is not closed by the pinch slide cores 7-1 and 7-2, have. In this state, the final blowing by the final blowing pin 30 raises the internal space pressure of the parison 200 so that the parison 200 is more tightly engaged with the cavity 3, More flat. For this reason, the parison 200 can be manufactured in perfect conformity with the designed fuel tank configuration without any wrinkles or defective molding.

In this final blowing, the internal space pressure of the parison 200 is raised to the set pressure of the one-way valve 40-1 provided in the discharge pin 40, and when the set pressure of the one-way valve 40-1 is exceeded And is discharged to the outside of the molds (1, 2) through the discharge pin (40) by opening of the one-way valve (40-1). Therefore, the final blowing process contributes to the finish molding of the parison 200.

S70 is a step of opening the molds 1 and 2 and taking out the molded parison from the molds 1 and 2. This is illustrated in FIG. As shown in the figure, the plastic fuel tank 300 is manufactured by taking out the molded parison in a state where the molds 1 and 2 are opened to the right and left. In this case, the plastic fuel tank 300 is formed with the first plug hole 300-1 formed by the final blowing pin 30, and the second plug hole 300-2 formed by the ejection pin 40 is formed do. Therefore, the operator forms the male screw thread and the valley screw so that the first stopper hole 300-1 and the second stopper hole 300-2 can be opened and closed with a stopper, respectively.

Meanwhile, FIG. 8 shows a process in which molding of the parison 200 is performed successively after the production of the plastic fuel tank 300. The baffle loading portion 20 having the baffle loading pin 21 coupled with the accessory 100 is raised from the lower portion of the molds 1 and 2 to the cavity portion 3 of the open molds 1 and 2 , Parison formation for manufacturing the plastic fuel tank 300 is repeated again by introducing the parison 200 from the upper portion of the molds 1 and 2 so as to surround the periphery of the accessory 100. [ The subsequent steps are performed in the same manner as S30-S70 and Figs.

As described above, in the method of manufacturing the plastic fuel tank according to the present embodiment, the accessory 100 including the baffle is introduced into the cavity portion 3 of the molds 1 and 2 by the baffle loading pin 21, The parison 200 is introduced from the upper portion of the molds 1 and 2 so as to surround the periphery of the accessory 100 and the pinch plates 10-1 and 10-2 are moved toward the blowing pins 23, 2, and then air is blown into the parison 200 by the blowing pin 23, and the molds 1 and 2 are closed to lower the baffle loading pins 21 The pinch slide cores 7-1 and 7-2 coupled to the lower ends of the left and right sides of the molds 1 and 2 are closed toward the lower portion of the parison 200 coming out from the molds 1 and 2, The baffle loading pin 21 is pushed downward into the slip using the swash plate 21a of the pin 21 to form the exiting of the baffle loading portion 20 and the baffle loading pin 20 is inserted into the parison 200 with the final blowing pin 30 Is the re-Ying perform final fire to put by taking out the parison (200) from the mold (1, 2) having a wall made from a plastic parison and the baffle 200, the plastic fuel tank is manufactured more easily.

1,2: Left and right mold 3: Cavity
5: Head 7-1, 7-2: Left and right pinch slide core
10-1, 10-2: Left and right pinch plates
20: baffle loading part 21: baffle loading pin
21a:
23: Blowing pin 30: Final blowing pin
40: exhaust pin 40-1: one-way valve
100: Accessory 200: parison
300: Plastic fuel tank
300-1, 300-2: 1st and 2nd stopper holes

Claims (14)

A method of manufacturing a plastic fuel tank having plastic walls made from baffles and parison,
a) introducing the accessory into a mold comprising a cavity by means of a baffle loading pin;
b) the parison is introduced from the top of the mold to surround the periphery of the accessory;
c) closing the pinch plate at the lower ends of the left and right sides of the mold toward the blowing pin;
d) pre-blowing the air into the parison by the blowing pin;
e) closing the mold and lowering the baffle loading pin;
f) a pinch slide core coupled to the lower ends of each of the left and right sides of the mold is closed toward a portion of the parison that has escaped to the lower end of the mold, and a final blowing step;
g) opening the mold and extracting the parison from the mold;
Wherein said plastic fuel tank has an inner surface and an outer surface.

The method of claim 1, wherein the blowing pin is concentric with the baffle loading pin and is located below the final blowing pin protruding toward the mold.
[2] The method of claim 1, wherein the step f) comprises at least one final blowing pin passing through the parison through the mold and finally blowing.
4. The method of claim 3, wherein the final blowing comprises the final blowing pin for supplying air into the parison, and a discharge pin for discharging the final blowing pin and the supplied air out of the mold. A method of manufacturing a tank.
5. The method according to claim 4, wherein the discharge pin is closed when the pressure in the mold is below a predetermined pressure, and is opened only when the pressure is greater than the predetermined pressure. The method according to claim 5, wherein the discharge pin has a one-way valve having an elastic force.
The plastic fuel tank as set forth in claim 4, wherein the final blowing pin and the discharge pin pass through the parison, wherein the plastic fuel tank is taken out from the mold, A method of manufacturing a tank.
A method of manufacturing a plastic fuel tank having plastic walls made from baffles and parison,
a) introducing the accessory into a mold comprising a cavity by means of a baffle loading pin;
b) the parison is introduced from the top of the mold to surround the periphery of the accessory;
c) closing the pinch plate at the lower ends of the left and right sides of the mold toward the blowing pin;
d) pre-blowing the air into the parison by the blowing pin;
e) lowering the baffle loading pin by slipping the pinch slide core along the ramp while closing the mold;
f) a pinch slide core coupled to the lower ends of each of the left and right sides of the mold is closed toward a portion of the parison that has escaped to the lower end of the mold, and a final blowing step;
g) opening the mold and extracting the parison from the mold;
Wherein said plastic fuel tank has an inner surface and an outer surface.
The plastic fuel tank according to claim 8, wherein the blowing pin is in the form of a cone having the swash plate, is concentric with the baffle loading pin, and is positioned below the final blowing pin protruding toward the metal mold. Gt;
The method as claimed in claim 8, wherein step (f) comprises at least one final blowing pin passing through the parison from the mold and finally blowing.

11. The method of claim 10, wherein the final blowing comprises the final blowing pin for supplying air into the parison, and a discharge pin for discharging the final blowing pin and the supplied air out of the mold. A method of manufacturing a tank.
[Claim 12] The method according to claim 11, wherein when the pressure in the mold is below a predetermined pressure, the discharge pin is closed and is opened only when the pressure is greater than the predetermined pressure.
The method as claimed in claim 12, wherein the discharge pin has a one-way valve having an elastic force.
[Claim 12] The method of claim 11, wherein the final blowing pin and the discharge pin pass through the parison, wherein the plastic fuel tank is taken out from the mold, A method of manufacturing a tank.

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