JPS6232809Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an injection molding machine for liquid resin, which comprises a mixing head that is detachably attached to a carriage, and a connection plug that is detachably connected to the mixing head. In particular, two material inflow passages are bored in the rear block of the mixing head, each of which is equipped with a stop valve, and the tip of the mixing cylinder of the mixing head is biased forward in the axial direction by a spring. Equipped with a valve body made of
A nozzle head is detachably attached to the tip of the valve body, while two material supply pipes are connected to the connection plug to form two material supply paths,
This relates to an injection molding machine for liquid resin, each of which is provided with a stop valve.

Generally, an injection molding machine for liquid resin is fixedly installed on a base, that is, a carriage.

On the other hand, injection molding operations are intermittent, and it is common for production to be interrupted for several hours to a day or more after a series of operations are completed.

When the molding operation is interrupted in this way, the resin remaining in the mixing head starts a curing reaction because it has already been mixed with a curing agent.
In the case of silicone rubber, it hardens in about 24 hours at room temperature, making subsequent injection molding operations impossible.

For this reason, it is necessary to clean the inside of the mixing head every time production is interrupted, and this cleaning work is complicated and wastes working time, and material is wasted in order to wash away the residual resin in the mixing head. There were flaws.

Furthermore, there is a problem in that contamination due to the cleaning solvent occurs, which is unfavorable in terms of occupational safety and health.

In view of the problems caused by the structural limitations of the injection molding machine for liquid resin based on the above-mentioned conventional technology, this idea was created by making the mixing head detachable from the carriage and by making the connecting plug for the material supply pipe detachable from the mixing head. With this structure, the present invention aims to provide an excellent injection molding machine for liquid resin that eliminates the above-mentioned drawbacks and eliminates the difficulties and can perform extremely efficient molding operations without waste.

The configuration of this invention in accordance with the above purpose is that a connecting plug with two material supply pipes is detachably connected to the rear block of the mixing head, and when the connecting plug is removed, the material supply path formed in the connecting plug and the mixing head are connected to the rear block of the mixing head. In addition, the tip of the mixing head opens the resin passage when the nozzle head is pressed against the mold for injection molding, and the nozzle head is inserted into the mold after molding. By providing a valve body that automatically closes the resin passage when the mixing head is removed from the carriage, the mixing head can be removed from the carriage, and when the molding operation is interrupted, it can be refrigerated to prevent the resin inside from curing. The gist of this is to make it possible to prevent this.

Next, an embodiment of this invention will be described below based on the drawings.

In FIG. 1, a mixing head 1 is composed of a mixing cylinder 2 and a nozzle head 3. A static mixer 4 and a preliminary mixing section 5 are housed inside the mixing cylinder 2. In the premixing section 5, a first material, e.g., a main agent, collides with a collision plate 7 from a central pipe 6 and flows out from a dividing hole 8, and a second material, e.g., a curing agent, collides with two diffusion plates 7. and passes through the passage hole 9. During this time, there is a delay in the transfer of the two drugs, and uneven mixing of the two drugs due to deviations in the starting of the supply pumps, etc., is eliminated, and the subsequent mixing in the static mixer 4 becomes more effective.

10 is a rear block of the mixing head 2, and as shown in FIG. 2, two material inflow passages 11 and 12 are bored therein;
12 communicates with the static mixer 4 via the premixing section 5. Moreover, the material inflow path 11,1
2, stop valves 13 and 14 are connected to the rear block 10.
It is provided so as to protrude from the rear end surface 10a. Reference numeral 15 denotes a bayonet mechanism protrusion provided on the outer periphery of the rear block 10, which engages with a bayonet mechanism groove of the carriage 16, and is connected to the rear block 10.
is detachably attached to the carriage 16.

17 is a connecting plug, which connects two material supply pipes, e.g.
The main agent supply pipe 18 and the curing agent supply pipe 19 are connected, and material supply passages 20 and 21 communicating with the supply pipes 18 and 19 are bored inside the supply passages 20 and 21. Stop valves 22 and 23 are provided. In addition, openings 24 and 25 are formed in the front surface of the connecting plug 17 to match the outer diameters of the stop valves 13 and 14 of the rear block 10.

Reference numeral 26 denotes a removable connection means, which consists of a stopper 27 and a mounting ring 28.
7a engages in the groove 29 of said rear block 10 to connect the connecting plug 17 to the mixing head 1.

In addition, 30 is a retaining ring.

In FIG. 4, reference numeral 31 denotes a valve body holding member, which is detachably attached to the tip of the mixing cylinder 2 by screwing or the like. The valve element holding member 31 has a through hole 32 formed in the center, a recess 33 for storing a spring formed in the front surface, and a valve seat 34 formed in the rear surface. A valve body 35 is slidably fitted into the through hole 32 through the valve body holding member 31 . Behind the valve body 35 is a central portion 3.
A valve portion 37 having a larger diameter than the valve portion 6 is formed, and a step portion 38 is formed between the two. 39 is the valve body 3
This is the resin passage in 5. The nozzle head 3 is removably attached to the protruding tip 40 of the valve body 35 by screwing or the like, and a spring 41 is inserted in the recess 33 between the nozzle head 3 and the valve body holding member 31. The nozzle head 3 and the valve body 35 are always urged forward.

Note that 3a is a nozzle hole, 42 is an internal space of the mixing cylinder 2, and 43 is a mold.

In the above configuration, when removing the connecting plug 17 from the rear block 10 of the mixing head 1, when the mounting ring 28 of the connecting means 26 is pulled upward, the stopper 28 is removed as shown in FIG.
The lower part of 7 springs up, and the engaging claw 27 at the tip
a comes out of the groove 29 of the rear block 10. Then, when the connecting plug 17 is pulled upward, it is removed from the rear block 10.

At this time, the material inflow path 11 of the rear block 10
The sphere 13a of the stop valve 13 is pushed upward to close the valve. The same applies to the other stop valve 14.

Also, the stop valve 22 of the material supply path 20 of the connection plug 17
is pushed downward to close the valve. The same applies to the other stop valve 23.

Conversely, when connecting the connecting plug 17, the front openings 24 and 25 of the connecting plug 17 are connected to the rear block 1.
According to the stop valves 13 and 14 of 0, the stop valves 13 and 1
4 as a guide and push down the rear block 10.
match.

Then, when the mounting ring 28 is lowered, the engaging claw 27a of the stopper 27 engages with the groove 29 of the rear block 10, and the connecting plug 17 is connected to the rear block 10.

At this time, the valve rod 22 of the stop valve 22 of the connecting plug 17
a comes into contact with the sphere 13a of the stop valve 13, and the sphere 1
At the same time as the valve rod 22a is pushed downward to open the valve, the valve rod 22a itself is also pushed upward to open the valve, and the material supply path 20 of the connecting plug 17 and the material inflow path 11 of the rear block 10 communicate with each other.

On the other hand, as shown in FIG. 4A, when the nozzle head 3 is in contact with and engaged with the mold 43,
The nozzle head 3 and the valve body 35 are moved backward against the spring 41, and the engagement step 38 of the valve portion 37 of the valve body 35 is separated from the valve seat 34 of the valve body holding member 31, so that the resin passage 39 is the internal space 42 of the mixing cylinder 2
communicate with.

When mixing head 1 is retracted, Figure 4B
As shown in FIG. 2, the nozzle head 3 and the valve body 35 are moved forward by the spring 41, so that the engagement step 38 of the valve portion 37 of the valve body 35 comes into contact with the valve seat 34 of the valve body holding member 31. Communication between the resin passage 39 and the internal space 42 of the mixing cylinder 2 is cut off.

Therefore, when the mixing head 1 is removed from the mold 43, the nozzle hole 3a of the nozzle head 3
This prevents resin from leaking.

Note that the embodiments of this invention are not limited to the embodiments described above; for example, the means for connecting the connecting plug and the rear block and the means for engaging the rear block and the carriage may be other detachable means, such as screws. It may be hot.

In addition, a stop valve on the rear block is provided to protrude,
Although the connecting plug is provided with an engaging opening, it is also possible to provide a stop valve protruding from the connecting plug and forming an engaging opening in the rear block.

As mentioned above, according to this invention, two material inflow channels are formed in the rear block of the mixing head, a stop valve is provided in the inflow channels, and a connecting valve connected to two material supply pipes is provided. By forming two material supply paths inside and providing a stop valve in the supply path, when the connecting plug is removed from the rear block, the connecting plug and the stop valve of the rear block will automatically close. , the two resin passages are blocked at the same time, and no resin leaks from the connecting plug and the end of the rear block of the mixing head.

In addition, a valve body that is always urged forward by a spring is built into the tip of the mixing head, so when the nozzle head comes into contact with the mold, the valve body opens and the injection molding process is performed. Since the valve body automatically closes when the mixing head is removed, the resin in the mixing head does not leak from the nozzle hole.

Therefore, since both ends of the mixing head separated from the connecting plug and the mold are closed, resin will not leak from both ends when the mixing head is removed from the carriage, and production operations can be carried out. When the mixing head is interrupted, the mixing head can be removed and stored separately in the refrigerator, and it can be stored for a long period of about one week until the resin inside hardens, which has the excellent effect of eliminating the need to clean the inside of the mixing head.

Moreover, since the valve body at the tip of the mixing head is operated by bringing the head into contact with and separating from the mold, there is no need to supply a working medium from the outside, which is extremely useful for removing the mixing head. .

Furthermore, the protruding stop valve serves as a guide when attaching and detaching the connecting plug, especially when connecting, making the connecting operation easier.

[Brief explanation of drawings]

The figure shows an example of this invention.
The figure is a partially broken perspective view of the mixing head, Figure 2 is a sectional view showing the state of connection between the mixing head and the connecting plug, Figure 3 is an explanatory diagram when removing the connecting plug from the mixing head, and Figure 4 is FIG. 4A is a sectional view of the tip of the mixing head, and FIG. 4A shows a state in which it is in contact with a mold, and FIG. 4B shows a state in which it is detached from the mold. 1...Mixing head, 2...Mixing cylinder, 3...
...Nozzle head, 4...Static mixer,
10... Rear block, 11, 12... Material inflow path, 13, 14... Stop valve, 16... Carriage, 17... Connection plug, 18, 19... Material supply pipe, 20, 21... Material supply Road, 22, 23...
Stop valve, 26...Connection means, 31...Valve body holding member, 35...Valve body, 37...Valve section, 39...Resin passage, 40...Protruding tip, 41...Spring, 42...
...Inner space of the mixing cylinder.

Claims (1)

[Scope of utility model registration request] A mixing head 1 having a mixing cylinder 2 containing a static mixer 4 and a nozzle head 3 and detachably attached to a carriage 16, and a connecting plug 17 detachably connected to a rear block 10 of the mixing head. In the injection molding machine for liquid resin, the rear block 10 of the mixing head is provided with two material inflow passages 11 and 12 communicating with the static mixer;
Stop valves 13 and 14 are provided in the material inflow passages, respectively, and the mixing cylinder 2 of the mixing head is
A valve body holding member 31 is detachably attached to the tip of the valve body holding member, and a valve body 35 having a resin passage 39 is slidably penetrated and fitted into the valve body holding member.
The nozzle head 3 is detachably attached to the protruding tip 40 of the valve body, and a spring 41 is interposed between the nozzle head and the valve body holding member 31. Two material supply pipes 18 and 19 are connected, and two material supply passages 20 and 21 communicating with the material supply pipes are bored, and stop valves 22 and 23 are provided in the material supply passages, respectively.
An injection molding machine for liquid resin, characterized in that it is equipped with.