KR101401390B1 - Apparatus for forming expanded polystyrene - Google Patents

Abstract

The present invention relates to an apparatus for molding a foam resin. The apparatus for molding a foam resin comprises a fixed mold part; a housing separated from the fixed mold part with a constant distance; the fixed mold part; a movable mold part movably arranged between the fixed mold part and the housing, and combined with the fixed mold part to launch the molding of the foamed resin; a link part connecting the housing and the movable mold part to push the movable mold part toward the fixed mold part in development, or pull the movable mold part toward the housing in contraction; a motor in the housing; a first bar connected to the rotary shaft of the motor; a crank part of a second bar having one side hinge-coupled with the first bar and the other side connected to the link part to convert the circular motion of the first bar into the linear motion to pull or push the link part.

Description

[0001] Apparatus for forming Expanded Polystyrene [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed resin molding apparatus and, more particularly, to a foamed resin molding apparatus capable of molding a foamed resin by more effectively pressing a mold by improving the structure of a cylinder member, .

Generally, STYROFOAM is a foamed resin in which a foaming agent such as pentane or butane is added to Expandable PolyStyrene (EPS) and bubbles are generated while heating and curing. Styrofoam moldings are not only light, but they are widely used for packaging cushioning materials, building materials, ornaments, and insulating materials because they are excellent in water resistance, heat insulation, soundproofing and buffering properties.

When producing the foamed styrofoam, the foamed polystyrene particles are aged for a predetermined time in a state of being preliminarily foamed by heating. (Hereinafter referred to as "raw resin") into preformed and aged polystyrene particles (hereinafter referred to as " preformed resin ") into a metal mold; a step of heating the metal mold with steam to mold the metal mold; And a step of discharging the cooled molded product through the separation of the process and the mold.

The molding of such a foamed resin can be performed by a molding apparatus proposed in Utility Model Application No. 20-2007-0004761 (name: a mold for a foam molding machine).

That is, as shown in FIG. 1, the molding apparatus includes a fixed mold frame and a movable mold frame to which a foaming resin is supplied, a cooling water supply portion, a vapor supply portion, and a raw material supply portion.

And, the movable mold frame can be joined to or separated from the stationary mold frame by moving back and forth by the cylinder.

Such a molding apparatus is also proposed in Japanese Patent Application Laid-open No. 5-154930. The molding apparatus has a structure in which a moving die plate is moved close to and apart from a stationary die plate by piston driving to open and close these die plates.

However, such a conventional foamed resin molding machine has a problem that the movable mold die is moved back and forth by the cylinder, and the cylinder presses the movable mold die in a linear direction, so that it can not be sufficiently pressed due to the limit of the pressing force.

In order to fill the cavity formed in the mold with the raw beads (foamable resin material) in the process of bringing the movable mold die close to the stationary mold die, a predetermined cracking clearance is secured therebetween, After filling the raw material, close the mold and tighten it. At this time, the cracking gap is important as a retraction path of the air when the raw material is introduced into the mold by the flow of air.

However, in the case of using a hydraulic cylinder, since the pressing force varies depending on variables such as the conveying speed and the weight of the movable mold die, the positional control is unstable and the cracking gap has an error of 0.5 to 1.0 mm with respect to the set value, There is a problem that the conditions become uneven.

Utility model registration application No. 20-2007-0004761 (Name: Molding mold for foaming resin molding machine) Japanese Patent Application Laid-Open No. 5-154930

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a foam mold capable of effectively molding a foamed resin by pressing a mold with a stronger force, And to provide a resin molding apparatus.

In order to achieve the above object, an embodiment of the present invention provides a mold assembly comprising: a stationary mold part;

A housing disposed at a fixed distance from the stationary mold;

A movable mold part movably disposed between the stationary mold part and the housing, the movable mold part progressing the molding of the foamed resin by being engaged with the stationary mold part;

A link portion connecting the housing and the movable mold portion in a multi-jointed structure to push the movable mold portion toward the stationary mold portion during deployment or pulling the movable mold portion in the housing direction during retraction; And

A motor provided in the housing; a first bar connected to the rotation shaft of the motor and performing circular motion; And a crank portion of a second bar which is hinged to the first bar on one side and connected to the link portion on the other side to convert the circular motion of the first bar into linear motion to push or pull the link portion.

As described above, the foam resin molding apparatus according to an embodiment of the present invention improves the structure for moving the movable mold frame back and forth, thereby more effectively forming the foam resin.

1 is a side view showing a structure of a foamed resin molding apparatus according to the prior art.
2 is a perspective view of a foamed resin molding apparatus according to the present invention.
Fig. 3 is a side view of the foamed resin molding apparatus shown in Fig. 2. Fig.
4 is a plan view of the foamed resin molding apparatus shown in Fig.
5 is a rear view of the foamed resin molding apparatus shown in Fig.
6 (a) and 6 (b) are views sequentially showing the operation of the foam resin molding apparatus shown in FIG.
FIG. 7 is a side view showing the structure of the position sensing unit shown in FIG. 2. FIG.
8 is a view showing a coupling structure of a fixing bar and a moving bar of the position sensing unit shown in FIG.

Hereinafter, a foamed resin molding apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figs. 2 to 6, the foamed resin molding apparatus 1 proposed by the present invention comprises a stationary mold section 3; A movable mold section 7 corresponding to the movable mold section 3 and movable; A housing (5) arranged at a distance from the movable mold part (7); A link portion (9) for connecting the housing (5) and the movable mold portion (7); And a crank portion (10) for driving the link portion (9) to move the movable mold portion (7) forward and backward.

In the foamed resin molding apparatus having such a structure, the stationary mold section 3 is provided with a stationary die 4, and a stationary mold 12 is disposed on one side of the stationary die 4.

The moving mold section 7 includes a moving die 6, and a moving die 14 is disposed on one side of the moving die 6.

The movable mold 14 is coupled with the stationary mold 12 during forward movement, thereby forming a cavity therein. At this time, the stationary mold 12 is connected with pipes t for supplying an eject pin, water, steam, air, or the like.

Therefore, the foamed resin filled in the cavities formed by the movable mold 14 and the stationary mold 12 is heated and formed by heating with steam or the like.

The moving die 6 is moved back and forth in a state of being inserted on a guide shaft 16 connecting the stationary die 4 and the housing 5. That is, the four corners of the fixing die 4 and the housing 5 are connected to each other by a guide shaft 16, and these four guide shafts 16 pass through the four corners of the moving die 6, respectively.

Therefore, when the movable die 6 is moved forward and backward, the four corners are moved back and forth while being supported by the guide shafts 16, so that the movable die 6 can be moved forward and backward in a stable state.

The link portion 9 can be moved back and forth by pushing or pulling the moving die 6 by foldably connecting the housing 5 and the moving die 6 by a joint structure.

More specifically, the link portion 9 includes two link assemblies, namely, a first link assembly 18 and a second link assembly 20. [

The first link assembly 18 and the second link assembly 20 have the same structure and are integrally connected to each other so as to be folded or expanded by the crank portion 10, to be.

The first link assembly 18 includes a first rod 22 hingedly connected to the upper rear surface of the moving die 6; A second rod hingedly connected to the upper portion of the front surface of the housing 5 at one side and hinged to the first rod 22 at the other side; A third rod hinged to the second rod; A fourth rod 28 hingably connected to the lower rear surface of the moving die 6; A fifth rod 30 hingedly connected to the lower front of the housing 5 at one side and hinged to the fourth rod 28 at the other side; A sixth rod (32) hinged to the fifth rod (30); And a first crosshead (33) connected to the crank portion (10) in a state where the upper and lower portions are hinged to the third rod (26) and the sixth rod (32)

In the middle portion of the first crosshead 33, two guide bars protruding rearward from the moving die 6, that is, a first guide bar G1 and a first guide bar G2 of the second guide bar G2 G1) can pass through.

Also, the first rod 22 to the sixth rod 32 are connected to each other by a hinge pin.

Therefore, when the first crosshead 33 is advanced by the crank portion 10, the third rod 26 and the sixth rod 32 are pushed, and the second rod 24 is moved clockwise, 5 rod 30 is rotated in the counterclockwise direction so that the first rod 22 and the fourth rod 28 are extended in the direction of the moving die 6 so that the moving die 6 is pushed toward the fixed die 4 .

Conversely, when the first crosshead 33 is retracted by the crank portion 10, the third rod 26 and the sixth rod 32 are pulled, and the second rod 24 is rotated counterclockwise, The fifth rod 30 rotates in the clockwise direction so that the first rod 22 and the fourth rod 28 can be folded in the direction of the housing 5 to pull the moving die 6 in the direction of the housing 5.

The second link assembly 20 includes a seventh rod 23 hingedly connected to the upper rear surface of the moving die 6; An eighth rod 25 hingedly connected to an upper portion of the front surface of the housing 5 at the other side and hinged to the seventh rod 23; A ninth rod (27) hinged to the eighth rod (25); A tenth rod (29) hingably connected to the lower rear surface of the moving die (6); One end of which is hingedly connected to the lower front of the housing 5 and the other end is hinged to the tenth rod 29; A twelfth rod 32a hinged to the eleventh rod 31; And a second crosshead 33a connected to the crank portion 10 in a state of being hinged to the ninth rod 27 and the twelfth rod 32a and extending back and forth and integrally connected to the first crosshead 33 .

A second guide bar G2 protruding rearward from the moving die 6 is inserted through the middle portion of the second crosshead 33a so as to be movable forward and backward.

The seventh rod 23 to the twelfth rod 32a are connected to each other by a hinge pin.

Therefore, when the second crosshead 33a is advanced by the crank portion 10, the ninth rod 27 and the twelfth rod 32a are pushed, and the eighth rod 25 is rotated clockwise, 11 rod 31 is rotated in the counterclockwise direction to expand the seventh rod 23 and the tenth rod 29 in the direction of the moving die 6 and push the moving die 6 in the direction of the fixed die 4 .

Conversely, when the second crosshead 33a is retracted by the crank portion 10, the ninth rod 27 and the twelfth rod 32a are pulled, and the eighth rod 25 is rotated counterclockwise, The eleventh rod 31 rotates in the clockwise direction so that the seventh rod 23 and the tenth rod 29 can be folded in the direction of the housing 5 to pull the moving die 6 in the direction of the housing 5.

The first crosshead 33 and the second crosshead 33a are connected to each other by the connecting rod 45 so that they can be moved forward and backward by the crank portion 10.

The crank portion 10 includes a motor M mounted on the housing 5; A first bar (34) connected to a rotation axis of the motor (M) and rotating along a circular trajectory in a clockwise or counterclockwise direction; One side of which is hingably connected to the first bar 34 and the other side of which is hingably connected to the connecting rod 45.

The first bar 34 may be connected directly to the rotary shaft of the motor M or may be connected by a reducer or the like. Accordingly, when the motor M is driven, the first bar 34 rotates clockwise or counterclockwise along the circumferential direction about the rotation axis.

The second bar 36 is connected to the first bar 34 by a hinge pin. Accordingly, when the first bar 34 rotates in the circumferential direction, the second bar 36 advances toward the housing 5 or backward in the opposite direction.

The number of the second bars 36 may be one or two. In other words, when two bars are two, one bar is disposed on each side of the first bar 34, so that the first bars 34 are disposed in the middle of the pair of second bars 36.

The construction of one or two second bars 36 as described above can be appropriately selected in accordance with the design specifications of the molding machine.

As a result, the rotational movement of the first bar 34 is converted into the linear movement of the second bar 36 and is transmitted to the crosshead.

At this time, since the second bar 36 is moved back and forth at a position apart from the center of rotation by the length of the first bar 34, the rotation moment of the first bar 34 acts. In this case, The crosshead is pressed with a relatively large force as compared with the case where the power is directly transmitted from the power source to the crosshead.

As a result, such a large pressing force is transmitted to the moving die 6, and the moving die 6 is brought into contact with the fixed die 4 with a larger force, so that the sealing state of the mold can be more effectively maintained.

The second bar 36 may have a straight line shape, but may have a curved line having a semicircular shape in the middle. These curved portions have a semicircular shape having a constant curvature.

Therefore, when the second bar 36 presses or pulls the connecting rod 45, the curved portion serves as an elastic body, so that the connecting rod 45 can be pressed or pulled more effectively.

Although only one set of the first bar 34 and the second bar 36 is described above, the present invention is not limited thereto, and one set 38 may be further disposed.

That is, the drive shaft is engaged with the rotation shaft of the motor M in the orthogonal direction by the bevel gear method, so that the drive shaft is arranged in both directions of the motor M.

Then, the first bars 34 and 38 are attached to both ends of the driving shaft so that the two first bars 34 and 38 are connected to each other. In this state, the second bars 36 are connected to the two first bars 34 and 38, respectively, to push or pull the crosshead.

In this way, two sets of first bars 34 and two bars can push and pull the connector rod by one motor M to advance and retract the moving die 6 with greater force.

2, 7 and 8, the position sensing unit 50 is disposed between the housing 5 and the moving die 6 to sense the position of the moving die 6. As shown in FIG.

The sensed position signal is transmitted to the control panel of the motor M to control the movement of the first bar 34 and the second bar 36 so that the moving die 6 moves in the direction of the fixed die 4 After advancing the car, stop it and move it forward again.

More specifically, the position sensing unit 50 includes a fixed bar 52 mounted on the housing 5; A movable bar 54 slidably mounted on the fixed bar 52 at one side and mounted to the movable die 6 at the other side; When the movable bar 54 is moved forward and backward by sensing the predetermined display of the fixed bar 52 by sensing the moving distance of the movable bar 54 and transmitting a signal to the control panel of the motor M (Not shown).

 The upper and lower edges of the fixed bar 52 are curved to form a space inside the movable bar 54. When the movable bar 54 is disposed in this space, 52). ≪ / RTI >

A sensor S is attached to one end of the movable bar 54. The sensor S responds to a predetermined terminal e provided on the fixed bar 52. [ The terminal e may be an electrode terminal or a magnetic terminal. The terminal e may be a single or a plurality of terminals. When the sensor S passes through each terminal e, the position of the current moving die 6 can be determined by the position signal of each point have.

Therefore, when the sensor S of the moving bar 54 passes the terminal e, the sensor S senses this and transmits a signal about the position of the moving die 6 to the control panel of the motor M Whereby the forward and backward distances of the moving die 6 can be controlled.

That is, after the first to twelfth rods 12.32a are primarily deployed by the drive of the motor M and the moving die 6 reaches a predetermined position (Fig. 6 (a)), The movement of the first bar 34 and the movement of the second bar 36 is stopped by the signal S of the sensor 54 being transmitted to the motor M. [ At this time, the moving die 6 is in close contact with the fixed die 4.

"자 형상으로 전개됨으로써 이동다이(6)를 고정다이(4) 방향으로 강한 힘으로 가압하여 발포시 이동 다이(6)가 후진되는 것을 방지할 수 있다.At this position, the control panel of the motor M drives the motor M again after a predetermined time has elapsed, so that the first and second crossheads 33 and 33a are secondarily advanced to move the first to twelfth rods And the state is fully developed (Fig. 6 (c)). That is, when the first to twelfth loads are "

So that the movable die 6 can be pressed against the fixed die 4 with a strong force to prevent the movable die 6 from being moved backward during foaming.

When the moving die 6 is stopped by the first advance, the first and second bars 34 and 36 are formed in a "V" shape as shown in Fig. 6 (b) to be. Therefore, when the moving die 6 advances secondarily, the first and second bars 34 and 36 are sufficiently extended horizontally as shown in Fig. 6 (c) It is in a state of being pressed by a supporting force.

At this time, when the first bar 34 rotates in the direction of the moving die 6 along the circular locus and is disposed on the straight line with the second bar 36, the moving die 6 advances to the maximum, And the coupling position.

As described above, the moving die 6 is not directly brought into close contact with the fixed die 4 by the once advancing movement but is first moved forward to adhere the moving die 6 to the fixed die 4 , It can be adhered with a stronger force by secondary advancing and finally bonding.

Hereinafter, the operation of the foamed resin molding apparatus according to one embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

As shown in Figs. 2 to 8, when the foamed resin is molded using the foamed resin molding apparatus 1 proposed by the present invention, the motor M of the crank portion 10 is driven first, (34) in the clockwise direction. At this time, since the second bar 36 is hinged to the first bar 34, the second bar 36 also rotates along the circular trajectory so that the first and second crossheads 33, 33a in the direction of the moving die 6.

At this time, the first and second guide bars G2 pass through the first and second crossheads 33 and 33a.

Thus, when the first and second crossheads 33, 33a advance, the third (9) rod and the sixth (12) rod are pushed, the second (8) rod is clockwise, 11 rod are rotated in the counterclockwise direction to expand the first rod 7 and the fourth rod 10 in the direction of the moving die 6 so that the moving die 6 is moved linearly in the direction of the fixed die 4 Push and move.

At this time, the movement of the first bar 34 and the second bar 36 is stopped by the control of the motor M just before the first to twelfth rods are completely deployed, so that the movable die 6 is moved to the fixed die 4 And then stops.

"자 형상을 이룸으로써 이동다이(6)를 고정다이(4) 방향으로 강한 힘으로 가압함으로써 발포시 이동 다이(6)가 후진되는 것을 방지할 수 있다.At this position, the first and second crossheads 33 and 33a are secondarily advanced as the motor M is driven again, and the first to twelfth rods are completely deployed. That is, when the first to twelfth loads are "

The movable die 6 can be prevented from moving backward during the foaming by pressing the movable die 6 in the direction of the fixed die 4 with a strong force.

As described above, the moving die 6 is not directly brought into close contact with the fixed die 4 by the once advancing movement but is first moved forward to adhere the moving die 6 to the fixed die 4 , It can be adhered with a stronger force by secondary advancing and finally bonding.

At this time, when the first bar 34 rotates in the direction of the moving die 6 along the circular locus and is disposed on the straight line with the second bar 36, the moving die 6 advances to the maximum, And the coupling position.

In addition, when there is foreign matter, which may affect the foaming, between the moving die 6 and the stationary die 4 during the stoppage between the first advancing and the second advancing, it is possible to secure time for removing the foreign matter can do.

In this way, steam can be injected into the molds 12 and 14 while the moving die 6 is in close contact with the stationary die 4, so that the foam molding can be performed.

After the molding process is completed, the moving die 6 is moved backward and moved in the direction of the housing 5. This process proceeds in the reverse order of the forward process.

That is, the motor M of the crank portion 10 is driven in the reverse direction to rotate the first bar 34 in the counterclockwise direction. At this time, since the second bar 36 is hinged to the first bar 34, the second bar 36 also rotates along the circular trajectory to move the first and second crossheads 33 and 33a to the housing 5, Direction.

Therefore, when the first and second crossheads 33 and 33a are retracted, the third (9) rod and the sixth (12) rod are pulled, the second (8) rod is pulled in the counterclockwise direction, The rod 11 is rotated in the clockwise direction so that the first rod 7 and the fourth rod 10 are folded in the direction of the housing 5 to move the moving die 6 in the direction of the housing 5.

At this time, the movements of the first bar 34 and the second bar 36 are stopped by the control of the motor M before the first to 12th rods are completely folded, so that the moving die 6 is moved from the housing 5 And then retracts to a predetermined distance and then stops.

At this position, the first and second crossheads 33 and 33a are further moved back by the motor M being driven again, so that the first to twelfth rods are completely folded. Therefore, the mold of the movable die 6 can be completely separated from the mold of the fixed die 4. [ Then, the molded article can be taken out of the mold by the ejection pin.

1: foaming resin molding device
3: Fixed mold part
5: Housing
7:
9: Link section

Claims (6)

A stationary mold part;
A housing disposed at a fixed distance from the stationary mold;
A movable mold part movably disposed between the stationary mold part and the housing, the movable mold part progressing the molding of the foamed resin by being engaged with the stationary mold part;
A link portion connecting the housing and the movable mold portion to each other in a multidirectional structure to push the movable mold portion toward the stationary mold portion during deployment and to pull the movable mold portion in the direction of the housing when retracted; And
A motor provided in the housing; a first bar connected to the rotation shaft of the motor and performing circular motion; And a second bar crank portion that is hinged to the first bar on one side and connected to the link portion to convert the circular motion of the first bar into a linear motion to push or pull the link portion,
And the second bar has a semi-circular curved portion having a predetermined curvature in the middle. The method according to claim 1,
The link portion including first and second link assemblies,
The first link assembly includes a first rod hingably connected to an upper rear surface of the moving die, A second rod hingedly connected to an upper portion of the front surface of the housing and the other rod hinged to the first rod; A third rod hinged to the second rod; A fourth rod hingably connected to a lower rear surface of the moving die; A fifth rod hingedly connected to the lower front of the housing at one side and hinged to the fourth rod at the other side; A sixth rod hinged on one end to the fifth rod and connected to the crank on the other end; And a first crosshead connected to the crank portion in a state where the hinge is connected to the third rod and the sixth rod,
The second link assembly each having a seventh rod hingably connected to the upper rear surface of the moving die; An eighth rod hingedly connected to an upper portion of the front surface of the housing and the other end hinged to the seventh rod; A ninth rod hinged to the eighth rod; A tenth rod hingably connected to a lower rear surface of the moving die; An eleventh rod hingedly connected to the lower front of the housing at one side and hinged to the tenth rod at the other side; A twelfth rod hinged to the eleventh rod; And a second crosshead connected to the crank portion in a state where the hinge is connected to the ninth rod and the twelfth rod. 3. The method of claim 2,
The first and second crossheads are connected to each other by a connecting rod, and are inserted by a second guide bar protruding rearward from the moving die and can be moved back and forth. 3. The method of claim 2,
A position sensing unit is further included between the moving die and the housing, and the position sensing unit includes a fixing bar mounted on the housing; A movable bar slidably mounted on the stationary bar at one side and mounted to the moving die at the other side; And a sensor mounted on the movable bar for sensing a terminal of the fixed bar when the movable bar moves back and forth, thereby detecting a moving distance of the movable bar and transmitting a signal to the control panel of the motor,
Wherein when the movable die moves a predetermined distance in the direction of the fixed die, the sensor detects the movement and transmits a signal to the control panel of the motor, and the motor stops the advancing of the movable die and then advances secondarily. . delete The method according to claim 1,
Wherein when the first bar rotates in the direction of the moving die along the circular trajectory and is disposed on the second bar in a straight line, the moving die reaches the engagement position with the fixed die.

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