JPH074902Y2 - Sealing structure for reaction injection molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has an injection port formed in a mold and an injection head for supplying a reactive resin to the cavity from the injection port.
The present invention relates to a sealing structure of a reaction injection molding device that effectively seals.

[Prior Art] For example, a resin molded product that is integrally molded from a skin material having a grain pattern and a foamed resin is used as an interior body that constitutes an automobile body.

In this case, a reaction injection molding machine is used to obtain the molded product. An injection head is engaged with an injection port formed in a molding die that constitutes this reaction injection molding apparatus,
A reactive resin such as polyol or isocyanate is mixed and injected into the cavity communicating with the injection port. The reactive resin is cured in the cavity, and the skin material previously placed in the mold and the cured resin form a molded product integrally.

By the way, a plastic sealing member such as packing is used to prevent the reaction molding resin from leaking from between the injection port and the injection head.

[Problems to be Solved by the Invention] However, the plastic seal member has a problem in durability and is easily damaged by the cured resin adhering to the injection head. Therefore, replacement work of the plastic seal member is frequently performed. It must be made.

Moreover, when an attempt is made to efficiently perform the molding work while sequentially conveying the molding die between a plurality of stations, the pouring head is securely and liquid-tightly engaged with the pouring port of the moving molding die. However, it becomes difficult.

The present invention solves this kind of problem, and even in the case of a movable mold, the injection head can be reliably engaged with the injection port of this mold and the durability is improved. An object is to provide an excellent sealing structure for a reaction molding apparatus.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention engages an injection head with an injection port formed in a mold, and a liquid reaction from the injection head to a cavity for a molded product. Supply a flexible resin,
In a reaction injection molding apparatus for obtaining a resin molded product, a first engagement surface provided at an end of the injection head and having a spherical shape, and a first engagement surface provided at the injection port, corresponding to the first engagement surface. A second engagement surface having a spherical shape and closely contacting with the first engagement surface to prevent leakage of the reactive resin.

[Operation] In the above-described sealing structure of the reaction injection molding apparatus according to the present invention,
When the injection head is engaged with the injection port formed in the mold, the first engagement surface having the spherical shape provided at the end of the injection head has the spherical shape provided with the injection port. 2 Closely contact the engaging surface. At that time, even if the molding die and the injection head are not accurately positioned, the first and second engagement surfaces reliably come into close contact with each other so as to follow their shapes. As a result, leakage of the reactive resin can be prevented as much as possible, and it is not necessary to perform the replacement work relatively frequently unlike the flexible seal member.

[Examples] The sealing structure of the reaction injection molding apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 2, reference numeral 10 indicates a reaction injection molding apparatus having a sealing structure according to this embodiment. The reaction injection molding apparatus 10 is a first station that opens and closes a plurality of molding dies 12, attaches a skin material to a cavity 18 (see FIG. 1) formed in the molding dies 12, and takes out a molded product. 20 and
A second station 24 for injecting a liquid reactive resin (foamed resin) into the cavity 18 from the injection port 22 of the molding die 12 and third and fourth stations 26, 28 for waiting for the curing of the reactive resin are provided. Prepare The first station 20 to the fourth station 28 include the first transport path 30a to the fourth transport path 3
The forming die 12 is sequentially transferred by being connected in a loop by 0b.

The first transport path 30a is a dolly 3 which is freely movable via a cylinder 32.
4 and also includes second and fourth conveyance paths 30b and 30d
Has a motor 38b, and a pinion (not shown) meshing with the elongated racks 40a, 40b is connected to the motors 36a, 36b. The third conveyance path 30c is provided with a plurality of conveyance rollers 46 that are rotated via a chain 44 under the driving action of the motor 42.

A reactive resin supply mechanism 50 is provided in the second station 24 (see FIGS. 1 and 4). The reactive resin supply mechanism 50 includes a frame 52 that hangs from above the molding die 12, and a movable main body 58 is supported by the frame 52 via a cylinder 54 and a guide bar 56 so as to be able to move up and down. Movable body 58
Holds a mixing head 60, and the mixing head 60 has passages 62a and 62b through which the reactive resin polyol and the isocyanate flow, respectively (see FIG. 1a). The passages 62a and 62b are integrally connected to the cylindrical injection head 66 in the mixing passage 64.

The injection head 66 and the injection port 22 of the molding die 12 are provided with the sealing structure 68 according to the present embodiment.

The sealing structure 68 is provided substantially at the end of the injection head 66, has a spherically shaped first engaging surface 70, and is provided at the injection port 22, and has a spherical surface corresponding to the first engaging surface 70. The second engagement surface 72 has a shape and is in close contact with the first engagement surface 70 to prevent leakage of the reactive resin.

The second engaging surface 72 is formed on the engaging member 74 which is detachable from the inlet 22, and as shown in FIG. 3, the radius of curvature R1 of the first engaging surface 70 is the second engaging surface. It is selected to be smaller than the radius of curvature R2 of the mating surface 72.

The rod 76 is arranged in the injection head 66,
76 is connected to a cylinder 78 and has a conical portion at the tip.
With 76a.

The release agent applying mechanism 80 is attached to the frame 52. The releasing agent applying mechanism 80 includes an applying means 82 for applying a releasing agent to the injection head 66, and a displacing means 84 for moving the applying means 82 between the injection head 66 and the injection port 22 of the molding die 12. With.

The displacement means 84 is provided with an arm 88 that is rotatable under the action of a motor 86 that is an actuator, and the coating nozzle 90 that constitutes the coating means 82 is attached to the arm 88. The coating nozzle 90 is in communication with a release agent supply source (not shown).

The operation of the reaction injection molding apparatus incorporating the sealing structure according to the present embodiment configured as described above will be described.

The mold 12 is opened at the first station 20, the skin material and the attachment parts are arranged, and then the mold clamping operation of the mold 12 is performed. Next, the mold 12 is conveyed to the second station 24 along the first conveying path 30a under the action of the cylinder 32.

Here, the cylinder 54 that constitutes the reactive resin supply mechanism 50 is driven and the movable main body 58 is lowered under the guide action of the guide bar 56. Therefore, the injection head 66 is engaged with the injection port 22 of the molding die 12, and the first engagement surface 70 of the injection head 66 and the second engagement surface 72 of the engagement member 74 are liquid-tight. To engage.

Under the driving action of the cylinder 78, the rod 76 is raised and
62a and 62b communicate with each other, and the liquid reactive resin
It is supplied from a and 62b to the injection head 66 through the mixing passage 64 (see FIG. 1a). The reactive resin is injected into the cavity 18 through the injection port 22 and reacts (foams). that time,
The cylinder 78 is driven so that the rod 76 descends and the passage 62
Cut off a and 62b, and connect the conical part 76a to the inlet 22
(See FIG. 1b).

In this case, in this embodiment, the injection port formed in the mold 12
When the injection head 66 is engaged with the injection head 22, the first engagement surface 70 having a spherical shape provided at the end portion of the injection head 66 has a second engagement having a spherical shape provided at the injection port 22. Face 72
Stick to. For this reason, the first engagement surface 70 and the second engagement surface 72 are brought into liquid-tight engagement, and the effect that the leakage of the reactive resin can be prevented as much as possible is obtained.

Moreover, the first engagement surface 70 and the second engagement surface 72 have a spherical shape, and the radius of curvature R1 of the first engagement surface 70 is
It is selected to be smaller than the radius of curvature R2 of the second engagement surface 72 (see FIG. 3). Therefore, even if the pouring head 66 is displaced with respect to the pouring port 22 of the mold 12 conveyed to the second station 24, the pouring action of the pouring head 66 itself causes the first engaging surface to move. The position of the 70 is corrected so as to follow the shape of the second engaging surface 72, and is brought into close contact with the second engaging surface 72.

This will cause the reactive resin to fill the injection head 66 and the injection port 22.
It becomes possible to prevent leakage from the engaging portion of the. Moreover, since the injection head 66 and the engaging member 74 are made of a hard material, wear is significantly reduced as compared with the conventional flexible sealing member, and frequent replacement work is not necessary.

Further, since the second engaging surface 72 is formed on the engaging member 74, the new second engaging surface 72 can be quickly replaced by replacing the engaging member 74 as necessary. Can be placed against.

After the reaction is completed, the cylinder 54 is driven and the movable main body 58 is lifted up to a predetermined height position integrally with the injection head 66.

Here, the motor 86 that constitutes the release agent application mechanism 80 is driven, and the application nozzle 90 is pivotally displaced integrally with the arm 88 and moved between the injection head 66 and the injection port 22. Further, a release agent supplied from a release agent supply source (not shown) is jetted from the coating nozzle 90 to the injection head 66 (see FIG. 1c). After the release agent coating operation is completed, the coating nozzle 90 is moved to a predetermined standby position via the motor 86 (see the chain double-dashed line in FIG. 4).

After the reactive resin is injected into the molding die 12, the molding die 12 is transferred to the third station 26 via the movable table 38a under the action of the motor 36a. Further, after being conveyed to the fourth station 28 via the motor 42 to cure the reactive resin, the movable stage 38b conveys the molding die 12 to the first station 20 to take out a molded product.

[Effect of the Invention] The sealing structure of the reaction injection molding apparatus according to the present invention configured as described above has the following effects and advantages.

Since the first engagement surface of the injection head is in close contact with the second engagement surface of the injection port formed in the mold, the reactive resin can be prevented from leaking as much as possible. Moreover, the first
Since the second engaging surface and the second engaging surface have a spherical shape, the first and second engaging surfaces follow each other's shape even if the molding die and the injection head are not accurately positioned. It adheres closely and does not cause leakage of the reactive resin.

[Brief description of drawings]

FIG. 1 is an operation explanatory view of a sealing structure of a reaction injection molding apparatus according to the present invention, FIG. 2 is a plan explanatory view of the reaction injection apparatus, FIG. 3 is an enlarged explanatory view of a main part of the sealing structure, FIG. 4 is a perspective explanatory view of a reactive resin supply mechanism that constitutes the reaction injection molding apparatus. 10 ... Reaction injection molding apparatus 12 ... Mold 18 ... Cavity 22 ... Injection port 50 ... Reactive resin supply mechanism 66 ... Injection head 68 ... Sealing structure 70, 72 ... Engaging surface 74 ... Engaging member

Claims (2)

[Scope of utility model registration request] 1. A reaction injection molding apparatus in which an injection head is engaged with an injection port formed in a mold and a liquid reactive resin is supplied from the injection head to a cavity for a molded article to obtain a resin molded article. The first engaging surface provided at the end of the injection head and having a spherical shape, the first engaging surface provided at the injection port and having a spherical shape corresponding to the first engaging surface, and A sealing structure for a reaction injection molding apparatus, comprising: a second engaging surface that is in close contact with the mating surface and that prevents leakage of the reactive resin. 2. The sealing structure for a reaction injection molding apparatus according to claim 1, wherein the second engaging surface is formed as an engaging member that is detachable from the injection port. .