JP3010755B2 - Screw-type resin injection equipment for injection molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw type resin injection device for injection molding, and more particularly to a screw type resin injection device used for an in-line screw type injection molding device.

[0002]

2. Description of the Related Art An in-line screw type injection molding apparatus has a screw type resin injection apparatus for injecting and filling a resin (resin material) into a cavity of a molding die. An injection cylinder member having an injection cylinder chamber and having a resin injection nozzle at one end, an injection screw rotatably and axially movable in the injection cylinder chamber, and an injection screw. It has a rotary drive unit such as a hydraulic motor that drives to rotate, an electric motor, and a hydraulic injection cylinder device that drives the injection screw in the axial direction, and the injection screw rotates around its own central axis by the rotary drive unit. By being driven, the resin is taken into the injection cylinder chamber by the screw pump action, and the injection screw is used by the injection cylinder device. The resin taken in the injection cylinder chamber by being driven forward in the axial direction toward the resin injection nozzle to the mold cavity is configured to injection.

[0003]

In a conventional screw type resin injection device, a hydraulic injection cylinder device for driving an injection screw in an axial direction is provided with a rear end side of the injection cylinder member and a hydraulic injection cylinder device. It is arranged in series with the injection cylinder member on the same axis. For this purpose, the overall length in the axial direction of the screw-type resin injection device becomes longer according to the required axial movement amount of the injection screw. This hinders the downsizing design of the screw-type resin injection device and greatly hinders the downsizing of the screw-type resin injection device.

The present invention has been made in view of the above-mentioned problems in the conventional screw-type resin injection apparatus for injection molding, and is capable of achieving a much more compact design than the conventional one. An object of the present invention is to provide a screw-type resin injection device for molding.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided an injection cylinder member having an injection cylinder chamber therein, a resin injection nozzle provided at one end, and an injection cylinder member. An injection screw arranged rotatably and axially movable, and removably inserted into and removed from an axially extending shaft receiving hole provided in the injection screw or a shaft member integrated therewith. A rotary drive shaft engaged with the injection screw or a shaft member integral therewith in a torque transmitting relationship, a rotary drive means for rotating the rotary drive shaft, and a parallel arrangement with the injection cylinder member. And a fluid pressure cylinder device rotatably engaged with the injection screw or a shaft member integral with the injection screw and driving the injection screw in the axial direction. It is achieved by shape-screw resin injection device.

[0006]

According to the above construction, the rotary drive shaft is removably inserted into the injection screw or the shaft member integral with the injection screw and the shaft receiving hole, so that the two maintain the torque transmission relationship as a whole. A fluid pressure cylinder device that is extendable and contractable in the axial direction and drives the injection screw in the axial direction is arranged in parallel to the side of the injection cylinder member,
As a result, the axial length of the screw-type resin injection device for injection molding is shorter than the conventional length by the axial length of the fluid pressure cylinder device.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show an embodiment in which a screw-type resin injection device for injection molding according to the present invention is applied as an injection device for a reaction hardening resin of a multi-liquid type such as silicone rubber.

The screw type resin injection device for injection molding is
It has a cylinder fixing base 3 fixed on the forward / backward moving board 1, and the cylinder fixing base 3 holds the injection cylinder member 5 in a horizontal posture.

The injection cylinder member 5 forms an injection cylinder chamber 7 inside, and has a tapered cylinder head member 9 for holding an injection nozzle connected at one end thereof on the same axis.

An injection screw 11 is disposed in the injection cylinder chamber 7 of the injection cylinder member 5 so as to be rotatable about its own central axis and movable in the axial direction. As shown in FIGS. 3 to 5, the injection screw 11 has a relatively large pitch, a triangular screw-shaped screw pump operating section 13 having a large lead angle, and is provided in front of the screw pump operating section 13. Screw pump action part 1
And a mixing screw portion 15 having a smaller pitch than that of No. 3 and a small lead angle. In the mixing screw portion 15, four axial grooves 17 having a rectangular cross section having a depth equal to the screw height are provided at equal intervals in the circumferential direction in the entire axial direction of the mixing screw portion 15. ing.

At the tip of the injection screw 11, FIG.
As shown in FIG. 8, a screw head member 19 is provided.
Are screwed and fixed, and a seal ring member 23 is externally fitted to the shaft portion 21 of the screw head member 19 so as to be movable in the axial direction.

The seal ring member 23 is axially movable between a seal seat surface 25 formed by the distal end surface of the injection screw 11 and an end surface 27 of the screw head member 19 opposed thereto, as shown in FIG. As described above, by sitting on the seal seating surface 25, the communication between the nozzle side and the screw side of the injection cylinder chamber 7 is cut off, whereas by sitting on the end surface 27 as shown in FIG. The gap 29 between the seal seat surface 25 and the gap 3 between the shaft portion 21
1 and three cut grooves 35 formed in the head 33 of the screw head member 19 allow the nozzle side and the screw side of the injection cylinder chamber 7 to communicate with each other. The reason why the number of the axial grooves 17 and the number of the cut grooves 35 are odd or even is to shift the phases of both to promote the kneading action.

On the outer periphery of the sealing member 23, two O-rings 37 are axially spaced from each other for sealing between the outer peripheral surface of the sealing member 23 and the inner peripheral surface of the injection cylinder chamber of the injection cylinder member 5. It is provided.

A nozzle device 39 with a valve is attached to the tip of the cylinder head member 9. As shown in FIG. 9, the valved nozzle device 39 includes a nozzle main body 43 inserted into the distal end hole 41 of the cylinder head member 9 so as to be movable in the axial direction, and a nozzle main body 43 in the injection cylinder chamber 7. A spool valve ring 47 which is circumscribed to the narrow shaft portion 45 of the small shaft portion 43 so as to be relatively displaceable in the axial direction, a valve seat member 49 fixed to the rear end of the thin shaft portion 45, and the nozzle body 43 are connected to the cylinder head member 9. And a compression coil spring 51 that urges the valve body 43 toward the valve closing side, that is, to the left side in the figure. By moving the valve seat member 49 relative to the head member 9 to the right in the drawing, the valve seat member 49 is separated from the contact with the spool valve ring 47 so that the valve hole 53 provided in the narrow shaft portion 45 in the radial direction is formed in the cylinder chamber. Let's expose 7 Going on. The valve hole 53 communicates with the guide hole 55 extending in the axial direction at the center of the nozzle body 43 and the nozzle hole 57 connected to the guide hole 55. It leads to the hole 57.

An O-ring 59 for sealing is provided on the outer periphery of the nozzle body 43.

As shown in FIGS. 1 and 2, an O-ring 61 is provided near the rear end of the injection screw 11 to prevent the resin from leaking backward.

A plunger shaft 63 is coaxially fixedly connected to the rear end of the injection screw 11. A reverse screw 6 for preventing the resin from leaking rearward is provided on the outer periphery of the portion where the plunger shaft 63 is fitted with the injection cylinder member 5.
The mechanical seal 67 is provided between the plunger shaft 63 and the cylinder fixing base 3.

The plunger shaft 63 includes the injection cylinder member 5.
Projecting rearward from the rear end, and this projection is rotatably and axially moved around its own central axis by a linear motion bearing 71 held by a bearing support member 69 fixed to the cylinder fixing base 3. Supported as possible.

In the vicinity of the rear end of the plunger shaft 63, a flange 73 is provided.
As shown in FIG. 2, the drive arm 7
One end of 5 is axially connected so as to be relatively rotatable with a needle thrust bearing 79 interposed between an end ring 77 fixedly mounted on the plunger shaft 63 and a flange 73.

As shown in FIG. 2, the drive arm 75 extends in the radial direction of the injection cylinder member 5 and is connected at its distal end to the distal end of the cylinder rod 83 of the pneumatic cylinder device 81. I have. The pneumatic cylinder device 81
It is arranged parallel to the side of the injection cylinder member 5 and is fixed to the side wall of the cylinder fixing base 3.

A shaft receiving hole 85 is formed at the rear end of the plunger shaft 63 so as to extend in the axial direction at the center of the plunger shaft 63 and open to the rear end surface of the plunger shaft 63. The rotation drive shaft 89 is inserted into the shaft receiving hole 85 so as to be able to be inserted into and removed from the shaft receiving hole 85.

In other words, the plunger shaft 63 and the rotary drive shaft 89 are engaged in telescoping. A torque transmission type linear motion bearing 87 is provided between the plunger shaft 63 and the rotary drive shaft 89, whereby the plunger shaft 63 and the rotary drive shaft 89 are engaged in a torque transmitting relationship, and the rotary drive shaft Rotation of 89 is plunger shaft 6
3 is transmitted.

The rotary drive shaft 89 is connected to an output shaft 93 of a motor 91 fixed on the forward / backward moving board 1 by a coupling 95 in a torque transmitting relationship, and is driven to rotate by the motor 91.

A resin supply block 97 is fixed to the cylinder fixing base 3. In this embodiment, as shown in FIG. 10, a resin material supply tube 99 also serving as a measuring cylinder is provided in the resin supply block 97 for injection molding of a two-component reaction-curable resin. Are mounted in parallel with each other. The resin material supply tube 99 has a resin supply block 97 having a resin discharge port 101 at the tip.
Is communicated with the resin passage 103 provided in the first passage. The resin passage 103 is connected to a resin passage 10 of the resin supply block 97 through a rotary valve 105 provided in the resin supply block 97.
7, a resin supply port 111 provided in the resin passage 109 of the cylinder fixing base 3 and an intermediate portion of the injection cylinder member 5
Is selectively communicated with.

The rotary valve 105 is of a manual type which is rotated by a manual lever 113. When the rotary valve 105 is in a rotating position as shown in FIGS. 1 and 11, when it is rotated clockwise by 90 degrees from the rotational position shown in FIGS. 1 and 11, the cleaning solvent passage 115 formed in the resin supply block 97 passes through the resin passage. 103 and the resin passage 107, and when they are turned 90 degrees counterclockwise from the turning position as shown in FIG. 1 and FIG. 11, the communication between the resin passage 103 and the resin passage 107. And the cleaning solvent passage 115 is communicated with the resin passage 107, and the communication between the resin passage 103 and the resin passage 107 is cut off to connect the cleaning solvent passage 115 to the resin passage 103. There.

As shown in FIG. 11, each of the resin material supply tubes 99 has a resin intake port 117 at the tip end side, and each of the resin intake ports 117 is a liquid material from an individual resin material tank 119. Resin material is resin supply pipe 1
21, on-off valve 123, and resin supply pipe 125.

The cleaning solvent passage 115 communicates with a cleaning solvent supply port 127 provided in the resin supply block 97 so that the cleaning solvent is supplied from the cleaning solvent tank 129 via a cleaning solvent supply pipe 131. It has become.

A piston 133 is fitted in each of the resin material supply tubes 99, and the resin material in the resin material supply tube 99 is moved from the resin discharge port 101 by moving the piston 133 to the left in the drawing. The liquid is discharged to the passage 103.

In the resin supply block 97, a pneumatic cylinder device 135 for feeding the resin material is supplied with a resin material supply tube 99.
It is attached in parallel with. In the pneumatic cylinder device 135 for feeding resin material, a connecting plate 139 is attached to the tip of a piston rod 137, and one end of two push rods 141 is fixedly connected to the connecting plate 139, respectively. A push pad 143 is attached to each end of the push rod 141, and the push pad 143 is connected to the piston 1 of the resin material supply tube 99.
33, and is pressed to the left in the figure.

A U-shaped position detection rod 145 is attached to the push pad 143, and a switch support rod 147 is attached to the resin supply block 97 in parallel with the resin material supply tube 99. Proximity switches 149 and 151 that perform switching by proximity of a switch sensitive member 153 attached to the tip of the position detection rod 145 are attached to the switch support rod 147 so that the attachment position can be adjusted. Thereby, the push pad 143 and the resin material supply tube 99
The axial position of the piston 133 is monitored.

The forward / backward moving substrate 1 is connected to the moving table 157 of the rodless pneumatic cylinder device 155, and is moved forward and backward by the rodless pneumatic cylinder device 155.

In this embodiment, a cooling jacket 159 is attached to a portion where the injection cylinder member 5 is exposed to the outside on the front side to prevent the resin in the injection cylinder chamber 7 from hardening. ing.

According to the above-described configuration, when the resin is injected into the molding die M, first, the rotary valve 105 is moved to the position shown in FIG.
Alternatively, the pneumatic cylinder device 135 for feeding resin material is driven in the rotating position as shown in FIG.
The piston 133 of each resin material supply tube 99 is pressed leftward in the figure by each of the push rod 141 and the push pad 143, whereby the resin material of each resin material supply tube 99 is pushed to the resin passage 103 and the rotary valve 10.
5. Resin supply port 111 through resin passages 107 and 109
It is further fed into the injection cylinder chamber 7 of the injection cylinder member 5. In addition, the rotary drive shaft 8 is driven by the electric motor 91.
9 is driven to rotate, and the rotation thereof is transmitted to the plunger shaft 63 and the injection screw 11 by a torque transmission type linear motion bearing 87. As a result, they rotate around their own central axis, and the resin material fed into the injection cylinder chamber 7 is moved forward in the injection cylinder chamber 7 by the screw pump action of the screw pump action section 13 of the injection screw 11. That is, it is fed to the mixing screw part 15 by pressure.

Since the mixing screw portion 15 is provided with an axial groove 17 over the entire area in the axial direction, the resin material from each of the resin material supply tubes 99 fed to the mixing screw portion 15 has a compressive action. While receiving, a part flows along the screw groove of the mixing screw part 15, and the remaining resin material advances through each axial groove 17, etc., and a plurality of flows are generated. Occurs. Thereby, the kneading of the resin material from each resin material supply tube 99 is performed with high efficiency and uniformity.

The kneaded resin material reaches the tip of the injection screw 11, presses the seal ring member 23 to the left in the figure, and pushes it open to open the gap 29, the gap 31 and the screw head member 19. It flows to the nozzle side of the cylinder chamber 7 through the cut groove 35.

At this time, the seal ring member 23 does not rotate due to the resistance of the O-ring 37, but only the injection screw 11 and the screw head member 19 rotate.
The seal ring member 23 and the injection screw 11 rotate relative to each other. As a result, the seal ring member 23 is reliably opened, and the gap 29 as the resin passage is reliably secured.

When the resin material is filled in the nozzle side of the injection cylinder chamber 7, the reaction force acts on the injection screw 11 as a rightward force in the drawing, whereby the injection screw 11 and the plunger The shaft 63 is retracted rightward in the figure. This retreat is performed with low resistance under the guidance of the linear motion bearing 71, and the retreat increases the amount of the rotary drive shaft 89 entering the shaft receiving hole 85,
Even when the plunger shaft 63 and the rotation drive shaft 89 are relatively moved in the axial direction, the rotation of the rotation drive shaft 8
9 is driven by a torque transmitting linear motion bearing 87 by a drive plunger shaft 63 and an injection screw 1.
1 is transmitted without delay.

At this time, the injection screw 11 may be lightly driven together with the plunger shaft 63 by the pneumatic cylinder device 81 to assist the backward movement of the injection screw 11 to apply a retreat force to the injection screw 11. In this case, the plunger shaft 63 is rotating, but since the drive arm 75 and the plunger shaft 63 can be relatively rotated by the thrust needle bearing 77,
The rotational drive and the axial drive of the plunger shaft 63 are compatible with each other without any trouble.

When a predetermined amount of resin material is filled in the injection cylinder chamber 7, the injection screw 1
The rotation of 1 and the discharge of the resin material from the resin material supply tube 99 by the pneumatic cylinder device 135 are stopped, and then the forward and backward substrate 1 is moved forward by the rodless pneumatic cylinder device 155. Thereby, the cylinder fixing base 3,
The entirety of the injection cylinder member 5 and the injection screw 11 moves forward, as shown in FIG. 9, the nozzle body 43 comes into contact with the molding die M, and the nozzle hole 57 becomes the sprue of the molding die M. It comes to communicate with S. When the forward / backward moving substrate 1 is further moved forward, the cylinder head member 9 moves forward with respect to the nozzle body 43, whereby the valve seat member 49 is separated from the contact with the spool valve ring 47 and the valve hole is moved. 53 is exposed to the injection cylinder chamber 7, and the injection cylinder chamber 7 communicates with the nozzle hole 57 via the guide hole 55.

Next, the injection screw 11 is driven forward by the pneumatic cylinder device 81. Then, first, due to the pressure of the resin material in the injection cylinder chamber 7, the seal ring member 23 moves backward with respect to the screw head member 19 and is seated on the seal seat surface 25, and the nozzle side and the screw side of the injection cylinder chamber 7 are moved. Communication is interrupted. Further, when the injection screw 11 is driven forward, this acts as a piston, and the forward thrust of the injection screw 11 by the pneumatic cylinder device 81 is converted into a resin material in the injection cylinder chamber 7 into an injection pressure. The resin material in the cylinder chamber 7 is injected from the nozzle hole 57 to the sprue S of the molding die M.

At this time, the resin material in the injection cylinder chamber 7 is filled with the outer periphery of the seal ring member 23 and the injection cylinder member 5.
The backflow leaks backward from the gap between the inner peripheral surface of the injection cylinder and the backflow, but this gap is sealed by the O-ring 37, so that the backflow is avoided. . As a result, pressure loss is eliminated, and a high injection pressure can be obtained. This means
It is particularly useful in the injection molding of a liquid resin having a low viscosity, a high fluidity and a tendency to cause backflow.

In injection molding of a multi-liquid reaction-curable resin such as silicone rubber, resin passages 107, 109,
If the resin material mixed in the resin supply port 111, the injection cylinder chamber 7, and the like stagnates for a certain period of time or more, this causes a curing reaction. Switching, the washing solvent in the washing solvent tank 129 is flowed from the washing solvent supply port 127 to the resin passages 107 and 109, the resin supply port 111, the injection cylinder chamber 7, and the like, and these are easily washed with the washing solvent. Can be.

FIGS. 12 and 13 show another embodiment in which the screw-type resin injection device for injection molding according to the present invention is applied as an injection device for a multi-liquid reaction-curable resin such as silicone rubber. I have. In FIGS. 12 and 13, parts corresponding to FIGS. 1 and 2 are denoted by the same reference numerals as those shown in FIGS.

In this embodiment, two resin material supply tubes 99 and a pneumatic cylinder device 135 for feeding resin material are vertically placed on the cylinder fixing base 3.

The two resin material supply tubes 99 are individually connected to two resin supply ports 111 individually provided in the injection cylinder member 5 by individual resin passages 109 formed in the cylinder fixing base 3. ing.

Further, in this embodiment, the pneumatic cylinder device 8 for driving the injection screw 11 in the axial direction is used.
Other structures in which 1 is arranged on both sides of the cylinder fixing base 3 in parallel with the injection cylinder member 5 are substantially the same as those in the above-described embodiment. In this embodiment, the same operation and effect as those of the above embodiment can be obtained.

In any of the above-described embodiments, the engagement of the plunger shaft 63 and the rotary drive shaft 89 in the torque transmitting relationship is performed by the torque transmitting linear motion bearing 87. It may be performed by connection, sliding key connection, or the like.

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various embodiments can be made within the scope of the present invention. Some will be apparent to those skilled in the art.

[0050]

As will be understood from the above description, according to the screw-type resin injection device for injection molding according to the present invention,
A rotary drive shaft is removably inserted into an injection screw or an integral shaft member and a shaft receiving hole, and both are axially extendable and contractable in the axial direction while maintaining a torque transmission relationship as a whole. A fluid pressure cylinder device for driving the screw in the axial direction is arranged in parallel to the side of the injection cylinder member, and by these, the length of the fluid pressure cylinder device is equal to the length of the screw type resin injection device for injection molding. The length in the axial direction is shorter than before, and a significantly compact design is possible as compared with the conventional one.

[Brief description of the drawings]

FIG. 1 is a side view showing a partial cross section of an embodiment in which a screw-type resin injection device for injection molding according to the present invention is applied as an injection device for a multi-liquid reaction-effect resin such as silicone rubber.

FIG. 2 is a plan sectional view of a screw portion of the screw-type resin injection device for injection molding shown in FIG.

FIG. 3 is a perspective view showing an embodiment of an injection screw used in the screw-type resin injection device for injection molding according to the present invention.

FIG. 4 is a half sectional view showing an embodiment of an injection screw used in a screw-type resin injection device for injection molding according to the present invention.

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

FIG. 6 is an enlarged sectional view showing one embodiment of a seal ring portion used in the screw-type resin injection device for injection molding according to the present invention in a closed state.

FIG. 7 is an enlarged cross-sectional view showing the seal ring portion shown in FIG. 6 in an open state.

FIG. 8 is a sectional view taken along the line VII-VII in FIG. 7;

FIG. 9 is a sectional view showing an embodiment of a valved nozzle device used in the screw-type resin injection device for injection molding according to the present invention.

FIG. 10 is an enlarged sectional view taken along line XX of FIG. 1;

FIG. 11 is a partial cross-sectional view showing one embodiment of a resin material supply portion of the screw-type resin injection device for injection molding according to the present invention.

FIG. 12 is a partial cross-sectional side view showing another embodiment in which the screw-type resin injection device for injection molding according to the present invention is applied as an injection device for a multi-liquid reaction effect type resin such as silicone rubber. FIG.

FIG. 13 is a sectional view taken along lines XIII-XIII in FIG. 12;

[Explanation of symbols]

 Reference Signs List 3 Cylinder fixing base 7 Injection cylinder chamber 11 Injection screw 63 Plunger shaft 71 Linear motion bearing 79 Needle thrust bearing 75 Drive arm 85 Shaft receiving hole 87 Linear motion bearing 89 Rotary drive shaft 91 Motor

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-28620 (JP, A) JP-A-48-38356 (JP, A) JP-A-50-150761 (JP, A) JP-A-59-1985 26236 (JP, A) JP-A-62-77917 (JP, A) JP-A-64-82912 (JP, A) JP-A 41-25103 (JP, Y1) JP-A-44-22256 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/46-45/84

Claims (1)

(57) [Claims] An injection cylinder member having an injection cylinder chamber inside and having a resin injection nozzle at one end, and an injection cylinder member rotatably and axially movable in the injection cylinder chamber. A screw and a screw which is removably inserted into an axially extending shaft receiving hole provided in the injection screw or a shaft member integral with the injection screw, and transmits the torque to the injection screw or a shaft member integral therewith. A rotary drive shaft engaged in a relationship, rotary drive means for rotating the rotary drive shaft, and rotating to the injection screw or a shaft member integrated therewith which is disposed in parallel with the injection cylinder member. And a hydraulic cylinder device that engages as possible and drives the injection screw in the axial direction.