KR101774117B1

KR101774117B1 - Nipple coupling method of plastic fuel

Info

Publication number: KR101774117B1
Application number: KR1020150180673A
Authority: KR
Inventors: 김종욱; 김정수
Original assignee: 주식회사 동희산업
Priority date: 2015-12-17
Filing date: 2015-12-17
Publication date: 2017-09-04
Also published as: KR20170072971A

Abstract

The present invention relates to a nipple bonding method for a plastic fuel tank and more particularly relates to a nipple bonding method of a plastic fuel tank in which a penetrating part 40 and a parison 3 which pass through a parison 3 when a nipple 50 is joined to a parison 3 of a thermoplastic plastic material And the nipple 50 connected to the nipple 50 is separately operated using the operation unit 30 so that the post-process of removing the penetrating part 40 from the nipple 50 in the completed plastic fuel tank 80 can be eliminated And further, the penetration part 40 can be reused.

Description

[0001] NIPPLE COUPLING METHOD OF PLASTIC FUEL [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of attaching a nipple to a plastic fuel tank, and more particularly, to a method of attaching a nipple to a parison when a parison of a thermoplastic plastic material is blow-molded to manufacture a fuel tank.

2. Description of the Related Art Generally, an engine of a vehicle is a device that converts thermal energy into mechanical rotational force by rotating a crankshaft using an explosive force generated by burning fuel in a combustion chamber.

In such an engine, fuel to be burned in the combustion chamber is continuously supplied, and a fuel tank capable of storing a certain amount of fuel in the vehicle is provided for continuous supply of fuel.

The fuel tank is usually made of steel and plastic. In recent years, however, the use of plastic fuel tanks for weight reduction and fuel economy improvement is increasing.

The plastic fuel tank is mainly manufactured by a melting process, an extruding process, and a blowing process. The melting process is a process of melting a plastic material by heating at a high temperature with a molten resin. In the extruding process, The blowing process is a process of extruding a parison in a mold such as a twin sheet or a cylinder and blowing a high pressure air into the inside of the parison, This is a step of molding into the shape of a tank.

On the other hand, during the process of manufacturing a plastic fuel tank by blow molding in a mold having a parison of a thermoplastic plastic material, the nipple is joined to the parison, And a pipe used in the fuel tank is joined to the end of the nipple protruding out of the tank in the plastic fuel tank, which has been manufactured.

The nipple is thermally welded to the parison. In order for the nipple to pass through the parison, a penetrating part (penetrating tip, needle pin) penetrating the parison is required. One end of the nipple And the cylinder is connected to the other end of the nipple so that the penetrating part and the nipple penetrate from the inside of the parison through the operation of the cylinder and the nipple is thermally welded to the parison .

After the parison is manufactured through the blow molding process, the through-hole is removed from the nipple through the post-process. Accordingly, the post-process for removing the through-hole from the nipple is required. There is a disadvantage in that cost increase and productivity are slowed by the post-process.

In addition, the penetrating parts removed from the nipple through a post-process can not be recycled as disposable consumables, which increases the manufacturing cost of the plastic fuel tank.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

JP 2010-527820A

The present invention relates to a method and apparatus for connecting a nipple to a parison during the process of blow molding a parison of a thermoplastic plastic material into a plastic fuel tank, The present invention provides a nipple coupling method for a plastic fuel tank that can reduce cost and increase productivity by manufacturing a plastic fuel tank and can further reduce costs by reusing through parts. .

In order to accomplish the above object, the present invention provides a method for connecting a nipple to a parison during the process of blow molding a parison of a thermoplastic material into a plastic fuel tank, Inserting an operation unit provided with parts and nipples spaced apart; Forming a through hole in the parison using the penetrating part; Separating the penetrating part from the through hole and positioning the nipple at the position of the through hole; And the nipple and the parison are joined together by heat fusion while passing the nipple through the through hole.

When the penetrating part forms a through hole in the parison, the leading end of the penetrating part penetrating the parison is inserted into the cutting hole formed in the mold; And the air in the cutting hole is discharged from the cutting hole through the air hole formed in the penetrating part when the tip of the penetrating part is inserted into the cutting hole.

And the through-hole component and the nipple are rotated simultaneously from the position of the through-hole to change positions of each other.

And the through-hole component and the nipple are simultaneously moved linearly from the position of the through-hole to change the position.

A parison bur is protruded in a direction through which the penetrating component passes when the penetrating component passes through the parison; And the front end of the parison bur is blocked by the blocking member provided in the cutting hole to determine the protruding length.

And an inner diameter of the parison bur serves as a through hole.

And the distal end portion of the penetrating part is inserted into the cutting hole through the blocking member.

In addition, the present invention relates to a device for coupling a nipple to a parison during the process of blow molding a parison of a thermoplastic plastic material into a plastic fuel tank, wherein the device is inserted into or removed from the parison Comprising an actuable operating unit; Wherein the operation unit comprises: a body portion capable of moving up and down; And a rotation tool unit rotatably coupled to the body part and having a through part for forming a through hole in the parison with respect to a rotation center and a nipple inserted and coupled to the through hole so as to be symmetrically positioned with respect to each other .

The rotary tool unit may include a rotation shaft coupled to the body part so as to be rotatable about an axis and projecting toward the parison; A rotating plate coupled to an end of the rotating shaft; A first cylinder coupled to one side of the rotation plate about the rotation axis and having a through part coupled to the end; A second cylinder coupled to the other side of the rotation plate facing the first cylinder about the rotation axis; And a gripper coupled to the second cylinder and gripping and fixing the nipple.

And protruding lengths from the rotating plate to the penetrating part and the nipple are equal to each other.

In addition, the present invention relates to a device for coupling a nipple to a parison during the process of blow molding a parison of a thermoplastic plastic material into a plastic fuel tank, wherein the device is inserted into or removed from the parison Comprising an actuable operating unit; Wherein the operation unit comprises: a body portion capable of moving up and down; And a linear movement tool unit coupled to the body part so as to be linearly movable, the nipple inserted into and coupled with the through hole forming the through hole in the parison and being positioned to be spaced apart from each other along the direction in which the nipple is linearly moved; And a control unit.

Wherein the linear motion tool unit comprises: a guide rail fixedly coupled to the body portion and having a parison formed in a straight line along the longitudinal direction; A moving block movably coupled along the guide rail; A first cylinder coupled to one side of the moving block and having a through part coupled to an end thereof; A second cylinder spaced apart from the first cylinder along the moving direction of the moving block and coupled to the moving block; And a gripper coupled to the second cylinder and gripping and fixing the nipple.

And protruding lengths from the moving block to the penetrating part and the nipple are equal to each other.

According to the present invention, when the nipple is joined to the parison of the thermoplastic plastic material, the penetrating part penetrating the parison and the nipple coupled to the parison are separately operated using the operation unit, It is possible to eliminate the post-process of removing the penetrating parts, thereby reducing the cost and productivity of the plastic fuel tank.

In addition, the present invention enables reuse of penetrating parts, thereby eliminating unnecessary parts waste and reducing cost.

1 to 3 are diagrams illustrating a process of manufacturing a plastic fuel tank using the method and apparatus according to the present invention,
FIGS. 4 and 5 are views for explaining operation units used in the apparatus of the present invention,
6 to 10 are views for explaining a process of coupling a nipple to a parison using the method and apparatus according to the present invention,
11 is a view of a plastic fuel tank with a nipple coupled as a plastic fuel tank that has been manufactured using the method and apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the accompanying drawings, a method and apparatus for coupling plastic fuel tanks according to a preferred embodiment of the present invention will be described. As shown in FIGS. 1 to 11, The process will be described in detail.

1 (A), the molten resin 1 is passed through the head core 2 of the extruder through a C-shaped section or a twin sheet (twin sheet) The parison 3 is extruded into a parison 3 made of a thermoplastic material having a shape of a sheet or sheet and is extruded through a mold 10 having a cavity 11 for blow molding .

One of the molds 10 is formed with a cutting hole 12 connected to the cavity 11. The cutting hole 12 is a space through which the nipple and the through part penetrating the parison 3 are inserted , Only one end is connected to the cavity (11) and the other end is formed in a closed structure in the mold for maintaining the pressure in the mold (10) during the blow molding of the parison (3).

After the parison 3 is positioned between the molds 10, the intermediate mold 20 is inserted between the parisons 3 as shown in Fig. 1 (B), and the intermediate mold 20 is positioned as shown in Fig. 1 (C) (Arrow M1), and the parison 3 located in the cavity 11 is ejected from the intermediate mold 20 (arrow M1) while the mold 10 is inserted between the intermediate mold 20 The pre-blowing is performed according to the shape of the cavity 11 by the air discharged through the first blow molding, the fluidity of the resin is improved through the primary blow molding, Elasticity is imparted.

An air passage is formed in the intermediate mold 20 for the primary blow molding, and the air passage has a structure connected to a high pressure pump located outside the mold 10.

When the primary blow molding is completed, the mold 10 merged as shown in FIG. 1 (D) is released again, and the intermediate mold 20 is released from the mold 10.

The operation unit 30 is inserted and positioned between the molds 10 as shown in Fig. 2 (E) after the intermediate mold 20 is removed from the mold 10. The operation unit 30 includes a parison 3, the operation unit 30 is provided with a penetrating part 40 (penetrating tip, needle pin) and a nipple 50 spaced apart from each other.

The operation unit 30 may be constructed as shown in FIG. 4, that is, a body 31 installed to move up and down between the molds 10; And a through part 40 rotatably coupled to the body part 31 and forming a through hole 3a in the parison 3 with reference to the rotation center C1 and a through hole 3a inserted into the through hole 3a And a rotation tool unit (32) provided so that the nipples (50) are positioned symmetrically with respect to each other.

The rotary tool unit 32 includes a rotation shaft 32a which is rotatably coupled to the body 31 and projects toward the parison 3; A rotation plate 32b coupled to an end of the rotation shaft 32a; A first cylinder 32c coupled to one side of the rotation plate 32b about the rotation axis 32a and having a through part 40 coupled to the end thereof; A second cylinder 32d coupled to the other side of the rotation plate 32b facing the first cylinder 32c about the rotation axis 32a; And a gripper 32e coupled to the second cylinder 32d and holding and fixing the nipple 50. [

The first cylinder 32c includes a first cylinder rod 32f and a through member 40 is coupled to an end of the first cylinder rod 32f. The first cylinder rod 32f The penetrating part 40 can be removed and replaced with a new one.

The second cylinder 32d includes a second cylinder rod 32g and a gripper 32e is fixedly coupled to an end of the second cylinder rod 32g. The gripper 32e is inserted into the nipple 50, So as to fix it.

The nipple 50 is inserted into the cutting hole 12 of the mold 10 through the through hole 3a of the parison 3 until the gripper 32e is bonded to the parison 3 by heat fusion, The gripper 32e releases the nipple 50 which has been held by the nipple 50. When the nipple 50 is held and fixed by the nipple 50 and the nipple 50 is joined to the parison 3 by heat fusion, Is separated from the rotation output unit (32).

It is preferable that the protruding lengths L1 from the rotating plate 32b to the penetrating component 40 and the nipple 50 in the state where the first and second cylinders 32c and 32d are not operated are equal to each other, The projecting length from the rotation plate 32b to the nipple 50 is set to be shorter than the projecting length of the nipple 50 in order to prevent the nipple 50 from interfering with the parison 3 when the tool unit 32 rotates by the rotation shaft 32a It is possible to prevent the penetration of the penetrating part 40 from the rotating plate 32b in order to prevent the loss of power due to the increase in the operating range of the second cylinder 32d. And the protruding length L1 to the nipple 50 are preferably equal to each other.

The operation unit 30 may be configured as another embodiment shown in FIG. A body 31 provided to move up and down between the molds 10; And a nipple 50 which is coupled to the body part 31 so as to be linearly movable and which is inserted and coupled to the through hole 3a and the through part 40 forming the through hole 3a in the parison 3, And a linear movement tool unit (33) provided so as to be spaced apart from each other along a linear movement direction.

The linear movement tool unit 33 includes a guide rail 33a fixedly coupled to the body 31 and having a parison 3 formed in a straight line along the longitudinal direction thereof. A moving block 33b movably coupled along the guide rail 33a; A first cylinder 33c coupled to one side of the moving block 33b and having a through part 40 coupled to the end thereof; A second cylinder 33d which is separated from the first cylinder 33c along the moving direction of the moving block 33b and is coupled to the moving block 33b; And a gripper 33e coupled to the second cylinder 33d and holding and fixing the nipple 50. [

The first cylinder 33c includes a first cylinder rod 33f and a through part 40 is coupled to an end of the first cylinder rod 33f. The first cylinder rod 33f The penetrating part 40 can be removed and replaced with a new one.

The second cylinder 33d is provided with a second cylinder rod 33g and a gripper 33e is fixedly coupled to an end of the second cylinder rod 33g and the gripper 33e is inserted into the nipple 50, So as to fix it.

It is preferable that the protruding length L2 from the moving block 33b to the penetrating part 40 and the nipple 50 are equal to each other in a state in which the first and second cylinders 33c and 33d are not operated .

The guide rail 33a may be directly coupled to the body 31 or may be connected to the body 31 via a separate connecting member 33h as shown.

Hereinafter, the operation unit 30 having the rotation tool unit 32 shown in Fig. 4 will be described as a base.

When the operation unit 30 is inserted between the molds 10 in which the intermediate mold 20 is removed from the mold 10 and then the operation of the first cylinder 32c is performed, The penetrating hole 3a is formed in the parison 3 by the movement of the penetrating part 40 and the tip of the penetrating part 40 penetrating the parison 3 is formed in the mold 10, Is inserted into the cutting hole (12) formed in the base.

6 shows a state before the penetrating part 40 passes through the parison 3 and Fig. 7 shows a state where the penetrating part 40 is inserted into the cutting hole 12 after passing through the parison 3. Fig.

A blocking member 60 in the form of a washer is provided in the cutting hole 12. The inner diameter of the blocking member 60 is smaller than the diameter of the cutting hole 12 so that a part of the inner peripheral surface of the blocking member 60 is inserted into the cutting hole 12, (12).

The penetrating part 40 penetrates the parison 3 to form the through hole 3a and the tip of the penetrating part 40 penetrating the parison 3 penetrates the inside diameter of the blocking member 60 And is inserted into the cutting hole 12 of the spill 10 in the form of a saw blade.

When the penetrating part 40 penetrates the parison 3 and forms the through hole 3a, the parison bur 3b is protruded from the through hole 3a in the direction through the penetrating part 40 The distal end of the parison bur bur 3b is clogged by the closure member 60 provided in the cutting hole 12 so that the projecting length of the parison bur bur 3b is determined by the closure member 60 do.

The inner diameter of the parison bur bur 3b is substantially the through hole 3a formed in the parison 3.

When the leading end of the penetrating part 40 is inserted into the cutting hole 12, the air in the cutting hole 12 acts as a pressure to generate a resistance force to the penetrating part 40. To prevent this, It is preferable that air in the cutting hole 12 be taken out to the outside of the cutting hole 12 when the leading end portion of the cutting insert 40 is inserted into the cutting hole 12. For this purpose, do.

The air hole 41 has a structure connected to the atmosphere through the inside of the penetrating part 40.

When the penetrating part 40 is moved forward to form the through hole 3a in the parison 3, the penetrating part 40 is moved backward by the operation of the first cylinder 32c toward the body part 31 And is removed from the through hole 3a.

Fig. 8 is a view showing a state in which the penetrating part 40 is missing from the through hole 3a.

2 (G), the positions of the penetrating part 40 and the nipple 50 are changed by the rotation of the axis of the rotating shaft 32a after the penetrating part 40 is retracted and removed from the through hole 3a As a result, the nipple 50 is positioned at the position of the through hole 3a as shown in FIG.

5, when the moving block 33b linearly moves along the guide rail 33a, the positions of the penetrating part 40 and the nipple 50 change each other.

A flange 51 protruding outward is formed on the outer circumferential surface of the nipple 50. The flange 51 is a portion to be coupled with the parison 3 by heat fusion.

When the nipple 50 is positioned at the position of the through hole 3a, the nipple 50 held by the gripper 32e by the operation of the second cylinder 32d moves forward as shown in FIG. 2 (H) 10, the forwardly moved nipple 50 has a cut hole (not shown) in the form of one end passing through the through hole 3a of the parison 3 and the blocking member 60 with the flange 51 as a reference, The face of the flange 51 is joined to the parison 3 by thermal fusion bonding by the pressing force of the second cylinder 32d so that the parison 3 is inserted into the parison 3, The coupling is completed.

The gripper 32e releases the nipple 50 that has been gripped and the operation of the second cylinder 32d causes the gripper 32e to release the nipple 50 from the body portion 32. [ The nipple 50 and the gripper 32e are separated from each other and the nipple 50 separated from the gripper 32e is kept coupled to the parison 3, The mold 30 is released from the mold 10 as shown in Fig. 2 (I).

3 (J), the blower pin 70 is inserted through the mold 10, and at this time, the blower pin 70 is inserted into the mold 10, The tip of the piston 70 penetrates the parison 3 and is located inside the parison 3 and the high pressure air is injected into the parison 3 through the air passage provided in the blower pin 70 The parison 3, to which the nipple 50 is coupled through the secondary blowing, is completed in the shape of the fuel tank 80.

When the parison 3 is formed into the shape of the fuel tank through the secondary blowing, the blower pin 70 is released from the mold 10 and the mold 10 is released again as shown in FIG. 3 (K) , And the plastic fuel tank 80 that has been molded as shown in FIG. 3 (L) is taken out from the mold 10 to release the blow molding for producing the plastic fuel tank 80.

11 shows a plastic fuel tank 80 that has been manufactured through blow molding. The plastic fuel tank 80 has a structure in which a nipple 50 is integrally coupled to the plastic fuel tank 80, And a pipe used in the fuel tank is connected to the end of the nipple 50. [

As described above, according to the embodiment of the present invention, when the nipple 50 is joined to the parison 3 made of a thermoplastic plastic material, the penetrating part 40 and the parison 3, which penetrate the parison 3, The combined nipple 50 can be separately operated using the operation unit 30 and the post-process of removing the penetrating part 40 from the nipple 50 in the plastic fuel tank 80 As a result, there is an advantage that cost reduction and productivity can be improved when the plastic fuel tank 80 is manufactured.

In addition, the present invention enables reuse of the penetrating member 40, thereby eliminating unnecessary parts waste and reducing costs.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled 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 by the following claims It will be apparent to those of ordinary skill in the art.

1 - Melt 2 - Head core
3 - Parison 10 - Mold
20 - intermediate mold 30 - operation unit
40 - Perforated part 50 - Nipple
60 - blocking member 70 - blower pin
80 - Plastic fuel tank

Claims

A method of bonding a nipple to a parison during the process of blow molding a parison of a thermoplastic plastic into a plastic fuel tank,
Inserting an operation unit provided in the parison so that the penetrating part and the nipple are spaced apart from each other;
Forming a through hole in the parison using the penetrating part;
Separating the penetrating part from the through hole and positioning the nipple at the position of the through hole;
The nipple and the parison are joined together by heat fusion while passing the nipple through the through hole;
When the penetrating part forms a through hole in the parison, the leading end of the penetrating part penetrating the parison is inserted into the cutting hole formed in the mold;
Wherein a washer-shaped blocking member is provided in the cutting hole, the inner diameter of the blocking member being smaller than the diameter of the cutting hole, so that a part of the inner peripheral surface of the blocking member is exposed to the cutting hole;
When the penetrating part is inserted into the cutting hole through the parison, the penetrating part is in the form of passing through the blocking member;
A parison bur is protruded in a direction through which the penetrating component passes when the penetrating component passes through the parison;
Wherein the front end of the parison bur is clogged with the blocking member provided in the cutting hole to determine the protruding length and the protrusion length of the parison bur is the same throughout the entire length of the plastic fuel tank.

The method according to claim 1,
And the air in the cutting hole is discharged from the cutting hole through the air hole formed in the penetrating part when the leading end of the penetrating part is inserted into the cutting hole.

The method according to claim 1,
Wherein the through-hole component and the nipple are simultaneously rotated from the position of the through-hole to change positions of the nipple and the through-hole component.

The method according to claim 1,
Wherein the position of the through hole is changed by linearly moving the penetrating component and the nipple from the position of the through hole.

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The method according to claim 1,
And the inner diameter of the parison bur serves as a through hole.

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