JP7270690B2 - Horizontal injection molding machine - Google Patents

Description

The present invention relates to a technology capable of shortening the horizontal length of a horizontal injection molding apparatus.

The injection molding apparatus is mainly composed of a mold clamping device that clamps the mold while opening and closing the mold, and an injection device that injects a resin material into the clamped mold.
An apparatus with a horizontal mold clamping axis is called a horizontal injection molding apparatus, and an apparatus with a vertical mold clamping axis is called a vertical injection molding apparatus.

Various types of horizontal injection molding apparatuses are known (see, for example, Patent Document 1 (FIG. 2) and Patent Document 2 (FIG. 1)).

Patent Literature 1 will be described with reference to the following drawings.
FIG. 7 is a conceptual diagram of a conventional screw, where L is the effective length of the screw 101 and D is the outer diameter.

In paragraph number [0011] of Patent Document 1, "The specifications of the screw for which the experiment was performed were: effective length L = 300 mm, screw outer diameter D = 45 mm, screw pitch P = 24, L / D = 6.66." There is an explanation of
Further, paragraph number [0013] of Patent Document 1 describes "as a comparative example, effective length L=540 mm, screw outer diameter D=25 mm, screw pitch P=25, L/D=21.6."

That is, conventionally, screws 101 with L/D=about 7 or about 22 have been used. However, in paragraph number [0002] of Patent Document 1, there is an explanation that "conventionally, a screw with an L/D of about 20 has been used." From this explanation, screws with an L/D of about 22 are the mainstream , the screws with L/D=about 7 are understood to be a minority.

FIG. 8 is a front view of a conventional horizontal injection molding apparatus.
A horizontal injection molding apparatus 100 includes a mold clamping device 110 having a horizontal mold clamping shaft 102, which clamps a mold 103 while opening and closing it, and an injection device 120 which injects a resin material into the clamped mold 103. is the main element.

The mold clamping device 110 includes a fixed platen 112 and a pressure receiving platen 113 mounted on a base 111 , a movable platen 114 horizontally movably arranged between the fixed platen 112 and the pressure receiving platen 113 , and a horizontal and a toggle mechanism 116 for moving the movable platen 114 along the tie bars 115 .

The injection device 120 includes a heating cylinder 121 containing a screw 101, an injection machine moving mechanism 122 for horizontally moving the heating cylinder 121, a screw rotating mechanism 123 for rotating the screw 101, and a screw moving mechanism for moving the screw 101 back and forth. The mechanism 124 is the main element.

The resin material put into the heating cylinder 121 via the hopper 125 is plasticized and weighed by rotating the screw 101 with the screw rotation mechanism 123 .
The heating cylinder 121 is moved by the injection machine moving mechanism 122 and the nozzle 126 at the tip is brought into contact with the mold 103 .
The screw moving mechanism 124 pushes the screw 101 to inject the resin material into the mold 103 .

The horizontal injection molding apparatus 100 having such a structure is widely used.
However, the mold clamping device 110 has the toggle link 127 as a main element. Since the toggle link 127 extends horizontally, the horizontal length of the mold clamping device 110 is increased.
Moreover, the heating cylinder 121 containing the screw 101 extends horizontally, and in addition, the screw moving mechanism 124 extends horizontally. Therefore, the horizontal length of the injection device 120 is increased.
As a result, although the conventional horizontal injection molding apparatus 100 has a small height, the horizontal length inevitably increases.

The larger the horizontal length of the horizontal injection molding apparatus 100, the larger the installation area (floor area) of the apparatus in the building.
However, in consideration of arranging multiple devices side by side in a building with limited floor space and efficiently arranging devices, it is desirable to reduce the horizontal length even for a horizontal injection molding machine. be

JP-A-9-104056 JP 2016-34751 A

An object of the present invention is to provide a horizontal injection molding apparatus with a sufficiently small horizontal length.

The invention according to claim 1 is composed of a mold clamping device having a horizontal mold clamping shaft for clamping a mold, and an injection device disposed on the side of the mold clamping device for injecting a resin material into the mold. A horizontal injection molding apparatus comprising:
The injection device includes a heating cylinder that incorporates a rotatable screw and heats the resin material to a predetermined temperature while agitating it; a material storage member that is connected to the heating cylinder and stores the resin material; a nozzle provided and extending to the mold; and an injection cylinder provided in the material storage member for injecting the resin material from the nozzle,
A cylinder axis of the injection cylinder extends horizontally,
The screw shaft of the screw extends vertically,
L/D of the screw is in the range of 0.5 to 3.0, where L is the effective length of the screw and D is the outer diameter of the screw;
the injection cylinder comprises a plunger,
The material storage member includes a first horizontal cylinder extending horizontally along the bottom of the heating cylinder, a vertical cylinder extending downward from the tip of the first horizontal cylinder, and the plunger extending horizontally from the lower part of the vertical cylinder. and a third horizontal cylinder extending horizontally from the bottom of the vertical cylinder coaxially with the second horizontal cylinder and having the nozzle at its tip.

The invention according to claim 2 is the horizontal injection molding apparatus according to claim 1,
The L/D is 1.0.

The invention according to claim 3 is the horizontal injection molding apparatus according to claim 1 or claim 2,
The heating cylinder has an outlet at the bottom for flowing out the resin material,
The bottom of the heating cylinder or the material storage member is provided with an outlet valve for opening and closing the outlet, and the outlet valve is moved by outlet valve driving means.

In the invention according to claim 1, in the injection device of the horizontal injection molding apparatus, the heating cylinder and the screw are arranged to extend vertically, and the injection cylinder is arranged to extend horizontally.
By arranging the screw and the heating cylinder vertically, the horizontal length of the injection device can be reduced, and the liquid resin material can be accumulated at the bottom of the heating cylinder while achieving uniform heating of the resin material.
As a result, the horizontal length of the injection device can be reduced while maintaining the quality of the resin material.
Moreover, the L/D of the screw was in the range of 0.5 to 3.0. If L/D is less than 0.5, the effective length L becomes too small to form a sufficient number of spiral grooves on the outer periphery. Moreover, if L/D exceeds 3.0, the height dimension of the injection device 40 becomes large, which is not preferable. Therefore, the L/D of the screw 47 is set in the range of 0.5 to 3.0.
By setting the effective length L of the screw to 3.0 or less, an increase in the height dimension of the injection device is prevented.
That is, the present invention provides a horizontal injection molding apparatus with a sufficiently small horizontal length.
In addition, in the invention according to claim 1, the material storage member includes a first horizontal cylinder extending horizontally along the bottom of the heating cylinder, a vertical cylinder extending downward from the tip of the first horizontal cylinder, and this vertical cylinder and a third horizontal cylinder extending horizontally from the bottom of the vertical cylinder coaxially with the second horizontal cylinder and having a nozzle at its tip.
By adopting the material storage member having such a structure, the vertical heating cylinder and the horizontal injection cylinder can be skillfully arranged.

In the invention according to claim 2, L/D is 1.0. If the effective length L of the screw is 1.0, the length of the screw will be sufficiently short and the height dimension of the injection device can be made smaller.

In the invention according to claim 3, an outlet for discharging the resin material and an outlet valve for opening and closing the outlet are provided, and the outlet valve is forcibly moved by the outlet valve driving means.
Even if a check valve is provided at the outlet of the heating cylinder, backflow of the resin material can be prevented. However, if the residue of the resin material accumulates on the essential parts of the check valve, the check valve leaks and the backflow prevention function is deteriorated.
In this regard, in the present invention, the outlet valve is forcibly moved by the outlet valve driving means. A forcibly moved outlet valve extrudes or scrapes off resin material debris. As a result, highly reliable anti-backflow action can be maintained for a long period of time.

1 is a diagram showing the overall configuration of a horizontal injection molding apparatus according to the present invention; FIG. It is a figure explaining the structure of an injection device. It is a figure explaining direction of a screw axis. FIG. 4 is a flow chart explaining the operation of the injection device; It is a figure explaining the horizontal length of a horizontal injection molding apparatus. It is a figure explaining the example of a change of an injection device. It is a figure explaining L/D of the conventional screw. It is a figure which shows the whole structure of the conventional horizontal injection molding apparatus.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In the cylinder, "extension" means advancing the piston rod to extend the entire length of the cylinder, and "retraction" means retracting the piston rod to shorten the entire length of the cylinder.

As shown in FIG. 1, a horizontal injection molding apparatus 10 has a base 11, a mold clamping device 20 and an injection device 40 mounted on the base 11 as main elements, and is characterized by a horizontal mold clamping shaft 20a. It is a device that The base 11 may be a bed or a platform.

The mold clamping device 20 includes a fixed platen 22 fixed to the base 11, a mold clamping mechanism 23 movably supported by the base 11, and arranged between the mold clamping mechanism 23 and the fixed platen 22 and movable to the base 11. tie bars 25 extending from the stationary platen 22 and passing through the movable platen 24 and the mold clamping mechanism 23; a mold opening/closing mechanism 26 that moves the movable platen 24 along the tie bars 25; 23, a half nut opening/closing mechanism 28 for opening and closing the half nut 27, and a position adjusting mechanism 29 extending between the movable platen 24 and the mold clamping mechanism 23.

The mold clamping device 20 is preferably a half-nut type, but may be a toggle type, a hydraulic type, or a hybrid type, and the structure and method are not limited to the embodiment.

The mold 30 is clamped by the mold clamping device 20 . The mold 30 is composed of, for example, a fixed mold 31 and a movable mold 32 .
A fixed die 31 is attached to the stationary platen 22 and a movable die 32 is attached to the movable platen 24 .

Preferably, rails 34 are laid on the base 11 and the sliders 35 and 36 are placed on the rails 34 . One slider 35 supports the mold clamping mechanism 23 and the other slider 36 supports the movable platen 24 .
It is recommended to interpose steel balls between the rails 34 and the sliders 35,36. Friction loss between the rail 34 and the sliders 35 and 36 is reduced, and the load on the mold opening/closing mechanism 26 is reduced.

The movable platen 24 is mechanically connected to the mold clamping mechanism 23 via the position adjusting mechanism 29 . Therefore, when the movable platen 24 is moved by the mold opening/closing mechanism 26, the mold clamping mechanism 23 moves together (including substantially together).
Therefore, the piston rod of the mold opening/closing mechanism 26 may be connected to the mold clamping mechanism 23 in addition to being connected to the movable platen 24 . Moreover, the mold opening/closing mechanism 26 may be attached to the fixed platen 22 instead of being attached to the bed 11 .

Circumferential grooves 37 are carved at necessary locations on the tie bar 25 at equal pitches. The half nut 27 engages the circumferential groove 37 when closed. When engaged, the mold clamping mechanism 23 is fixed (including almost fixed) to the tie bars 25 .
Opening the half nut 27 allows the mold clamping mechanism 23 to move relative to the tie bar 25 .

The mold clamping action of the mold clamping device 20 configured as above will be described below.
In FIG. 1 the mold 30 is open.
The half nut opening/closing mechanism 28 opens the half nut 27 .
Next, the mold opening/closing mechanism 26 is retracted. The movable platen 24, the mold clamping mechanism 23, the movable mold 32, the position adjusting mechanism 29, and the half nut 27 move together to the right in the figure. This movement is continued until the movable mold 32 hits (touches) the fixed mold 31 .

After the movable mold 32 touches the fixed mold 31 , the mold clamping mechanism 23 is slightly moved by the position adjusting mechanism 29 to align the projection of the half nut 27 with the recess of the circumferential groove 37 . That is, when the protrusion of the half nut 27 does not match the recess of the circumferential groove 37 and the engagement is insufficient, the position adjustment mechanism 29 corrects the engagement to a sufficient state.

Next, the half nut 27 is closed by the half nut opening/closing mechanism 28 . In the closed state, the mold clamping mechanism 23 is fixed to the tie bars 25 .
Next, the mold clamping mechanism 23 is extended. Due to this extension, the mold 30 is clamped.

The mold opening/closing mechanism 26, the half nut opening/closing mechanism 28, and the position adjusting mechanism 29 described above are preferably hydraulic cylinders, but may be electric cylinders. The type and structure are not limited.

Next, a specific structural example of the injection device will be described with reference to FIG.
As shown in FIG. 2, the injection device 40 includes a slide board 41 mounted on the base 11, a plate 42 mounted on the slide board 41, an injection cylinder 43 mounted on the plate 42, and an injection cylinder 43 mounted on the plate 42. 43, a bracket 45 placed on the slide board 41 at a position away from the injection cylinder 43, a material storage member 60 placed on the bracket 45, and a material storage member 60 placed on the material storage member 60. a heating cylinder 46, a screw 47 rotatably accommodated in the heating cylinder 46, a top plate 48 supported by the heating cylinder 46 and the support member 44, and a servomotor 49 attached to the top plate 48. , a gear group 50 arranged on the top plate 48 , a cover 51 surrounding the gear group 50 , and a hopper 52 attached to the heating cylinder 46 .

A cylinder shaft 43a of the injection cylinder 43 extends horizontally, and a screw shaft 47a of the screw 47 extends vertically. That is, the injection cylinder 43 is placed horizontally, and the heating cylinder 46 is placed vertically.

The slide platen 41 is connected to the stationary platen 22 by an injection machine moving mechanism 53 .
When the injection machine moving mechanism 53 is contracted, the slide board 41 approaches the fixed board 22, and when it is extended, the slide board 41 is separated from the fixed board 22. - 特許庁

The injection cylinder 43 comprises a hydraulic cylinder 54 , a piston 55 housed in the hydraulic cylinder 54 , and a plunger 56 extending from the piston 55 to the stationary platen 22 . Preferably, a rod 57 extends from piston 55 in the opposite direction to plunger 56 . The position of this rod 57 is detected by a position detection sensor 58 such as an encoder.

The material storage member 60 includes a first horizontal tube 61 extending horizontally along the bottom of the heating tube 46, a vertical tube 62 extending downward from the tip of the first horizontal tube 61, and a vertical tube 62 extending downward from the vertical tube 62. A leg portion 63 placed on the bracket 45, a second horizontal tube 64 extending horizontally from the bottom of the vertical tube 62 and accommodating the plunger 56, and a second horizontal tube 64 coaxially extending horizontally from the bottom of the vertical tube 62. and a third horizontal tube 65 having a nozzle 66 at its tip.

By extending the bracket 45 upward, the leg portion 63 can be omitted or the size can be reduced.
A heater 67 is appropriately wound around the material storage member 60 and the heating cylinder 46, and the heater 67 keeps the material storage member 60 and the heating cylinder 46 at an appropriate temperature.
Preferably, the third horizontal cylinder 65 is provided with a shut valve 68 which is opened and closed by a shut valve opening/closing mechanism 69 .

The heating cylinder 46 is connected to the top plate 48 with bolts 71 .
The heating cylinder 46 has a shaft holder 46A and a bearing 72 on the shaft holder 46A. The shaft holder 46A rotatably supports the screw 47 via a bearing 72. As shown in FIG.

The shaft holder 46A is fitted into the heating cylinder 46 and fixed with bolts.
Further, if the bottom of the heating cylinder 46 is separable, the shaft holder 46A can be integrally formed with the heating cylinder 46. As shown in FIG. Therefore, the shape and form of the shaft holder 46A, including whether or not it is provided, are arbitrary.

A resin material outlet 73 is provided at the bottom of the heating cylinder 46 , and the outlet 73 is closed by an outlet valve 74 . This outlet valve 74 is opened and closed by outlet valve driving means 75 .
The outlet valve 74 is movably housed in the first horizontal cylinder 61 . However, outlet valve 74 may be provided at the bottom of heating barrel 46 .
That is, the outlet valve 74 is provided at the bottom of the heating cylinder 46 or the material storage member 60 (first horizontal cylinder 61).

Even if a general-purpose check valve is provided at the outlet 73 of the heating cylinder 46, backflow of the resin material can be prevented. However, if the residue of the resin material accumulates on the essential parts of the check valve, the check valve leaks and the backflow prevention function is deteriorated.
In this regard, in this embodiment, the outlet valve driving means 75 forcibly moves the outlet valve 74 . The forcibly moved outlet valve 74 extrudes or scrapes off the residue of the resin material. As a result, highly reliable anti-backflow action can be maintained for a long period of time.

The gear group 50 includes a drive gear 76 provided on the shaft of the servomotor 49, a large-diameter intermediate gear 77 rotated by the drive gear 76, a small-diameter gear 78 coaxial with the large-diameter intermediate gear 77, and these gears. A large-diameter driven gear 79 rotated by a small-diameter gear 78 is connected to the screw 47 .

The rotation of the servomotor 49 is decelerated by a small-diameter drive gear 76 and a large-diameter relay gear 77 , and further decelerated by a small-diameter gear 78 and a large-diameter driven gear 79 .
As a result, the screw 47 is turned at low speed.

Also, the output torque of the servomotor 49 is increased by the small-diameter drive gear 76 and the large-diameter relay gear 77 , and further increased by the small-diameter gear 78 and the large-diameter driven gear 79 . The output torque of the servomotor 49 can be small, and the servomotor 49 can be a small, lightweight, and inexpensive control motor with a small output.

Next, the screw 47 will be explained.
The screw 47 is an ultra-short screw, and when L is an effective length and D is an outer diameter, L/D is approximately 1.0 in the embodiment.
That is, L and D were determined while securing the length of the spiral groove provided on the outer periphery of the screw 47 .
If the L/D of the screw 47 is 1.0, the length of the screw 47 is sufficiently short, and the height dimension of the injection device 40 can be reduced.

Conventionally, screws used in injection devices have an L/D of about 7 or about 22 and a small outer diameter D, as described in the prior art. A long screw with a small diameter is rotated at high speed.
In contrast, the screw 47 according to the invention has a much larger outer diameter D and a much shorter length L.

The resin material moves along a spiral groove formed on the outer circumference of the screw 47 . The peripheral speed of the screw 47 is directly proportional to the outer diameter D. When the peripheral speeds of the conventional and the present invention are matched, the screw 47 according to the present invention can be rotated at a sufficiently low speed.

Note that the L/D of the screw 47 is not limited to 1.0.
According to studies by the present inventors, any L/D in the range of 0.5 to 3.0 can be adopted. If L/D is less than 0.5, the effective length L becomes too small to form a sufficient number of spiral grooves on the outer periphery. Moreover, if L/D exceeds 3.0, the height dimension of the injection device 40 becomes large, which is not preferable.
Therefore, the L/D of the screw 47 should be in the range of 0.5 to 3.0, preferably 1.0.

Moreover, preferably, the tip (lower end) of the screw 47 may be formed into a conical surface, and a spiral groove may be provided in this conical surface. The rotating spiral groove can impart a swirling force to the liquid resin material accumulated at the bottom of the heating cylinder 46 . The swirling force further agitates the liquid resin material, thereby achieving further uniformity of temperature and further homogenization of the material.

Next, the reason why the screw 47 is vertically arranged will be explained based on FIG.
As shown in FIG. 3A, a comparative example in which the screw 47 and the heating cylinder 46 are arranged such that the screw shaft 47a is horizontal will be considered.
First, in the heating cylinder 46, the upper portion 46b becomes hotter than the lower portion 46a. That is, a temperature difference inevitably occurs in the vertical direction. As a result, temperature unevenness occurs in the resin material, which is not preferable.
Secondly, the resin material, which used to be a solid material, is softened by being kneaded and compressed while being heated, and becomes a liquid material. This liquid material accumulates near the lower portion 46 a of the heating cylinder 46 . It becomes difficult to smoothly eject the resin material from the outlet 73 of the heating cylinder 46 .

As shown in FIG. 3(b), an example in which the screw 47 and the heating cylinder 46 are arranged such that the screw shaft 47a is vertical will be examined.
First, after the resin material is put into the heating cylinder 46, it flows down toward the outlet 73 while being heated, kneaded and compressed. A temperature difference occurs between the upper portion and the lower portion along the screw shaft 47a, but no temperature difference occurs on the plane (horizontal plane) orthogonal to the screw shaft 47a. Therefore, temperature unevenness does not occur in the resin material.
Second, the liquid material collects at the bottom of the heating cylinder 46 . It becomes easy to smoothly take out from the outlet 73 of the heating cylinder 46 .
From the above, it is preferable to arrange the screw shaft 47a vertically.

The reason why the screw shaft 47a is arranged vertically in FIG. 2 is as described in FIG.
Also, in FIG. 2, the injection cylinder 43 has a laterally long overall length considering the long projecting plunger 56 (and rod 57). By arranging the long injection cylinder 43 with its axis horizontal, the height dimension of the injection device 40 can be reduced.
In the screw 47 as well, by keeping L/D at 3 or less and reducing the length L, it is possible to reduce the height dimension of the injection device 40 even though the screw 47 is arranged so that the shaft is vertical. can.

The operation of the injection device 40 configured as described above will be described with reference to FIG.
In ST01 of FIG. 4 (step number 01, the same applies hereinafter), the outlet valve is opened. That is, in FIG. 2, outlet valve 74 is moved to open outlet 73 .
At ST02, the shut valve is closed. That is, in FIG. 2, shut valve 68 is turned to close nozzle 66 .
In ST03, back pressure control of the injection cylinder is performed. That is, in FIG. 2, back pressure control of the injection cylinder 43 is started so that a predetermined reaction force (resistance force) is applied to the plunger 56 .

In ST04, the resin material is plasticized while rotating the screw. In FIG. 2, the resin material flows through the outlet 73, the first horizontal tube 61, the vertical tube 62, the second horizontal tube 64, and the third horizontal tube 65 in order, and fills them. Due to this filling, the plunger 56 is gradually retracted (moved to the right in the figure). The resin material is weighed according to the following equation: cross-sectional area of plunger 56 x travel distance of plunger 56 = weighed value. When the weighed value reaches a predetermined value, the weighing is completed and the back pressure control is terminated.

In ST05, the completion of weighing is checked, and when the weighing is completed, the outlet valve is closed (ST06).
In ST07, it is confirmed that the clamping of the molds is completed, and when the confirmation is completed, the shut valve is opened (ST08).
When the shut valve 68 is opened, the plunger 56 advances and injects the resin material from the nozzle 66 (ST09).
When it is confirmed in ST10 that the injection has ended, the shut valve is closed (ST11).

Advantages of the horizontal injection molding apparatus 10 according to the present invention will now be described with reference to FIG.
FIG. 5(a) shows a conventional horizontal injection molding apparatus 100. As shown in FIG.
The horizontal length of the conventional mold clamping device 110 is L110, the horizontal length of the injection device 120 is L120, and the horizontal length of the horizontal injection molding device 100 is L100. L100 is approximately the sum of L110 and L120.

FIG. 5(b) shows a horizontal injection molding apparatus 10 according to the present invention.
The horizontal length of the mold clamping device 20 of the embodiment is L20, the horizontal length of the injection device 40 is L40, and the horizontal length of the horizontal injection molding device 10 is L10. L10 is roughly the sum of L20 and L40.

A conventional mold clamping device 110 shown in FIG. 5A is of a toggle link type. On the other hand, the mold clamping device 20 shown in FIG. 5(b) is a half-nut system. The horizontal length can be made smaller with the half-nut method than with the toggle link method.
As a result, L20 was sufficiently smaller than L110.

Further, in FIG. 5A, the heating cylinder 121 is placed horizontally. On the other hand, in FIG. 5B, the heating cylinder 46 is placed vertically. L40 is smaller than L120 due to the difference in vertical and horizontal arrangement.
As a result, the horizontal length L10 of the horizontal injection molding apparatus 10 according to the present invention is sufficiently smaller than the horizontal length L100 of the conventional horizontal injection molding apparatus 100. FIG.

Next, a modified example of the injection device 40 will be described with reference to FIG.
As shown in FIG. 6, the neck of the screw 47 is extended and a horizontally extending pin 81 is erected between the upper bearing 72 and the lower bearing 72 . In addition, a cam groove 82 for housing a pin 81 is provided in the shaft holder 46A on the heating cylinder 46 side. The cam groove 82 meanders vertically by 0.2 to 1.0 pitches of the spiral groove provided in the screw 47 .

At the same time, the small-diameter gear 78 is replaced with one having a sufficiently wide tooth width.
When the screw 47 is rotated in a predetermined direction by the servomotor 49 and the gear group 50, the pin 81 moves along the guide groove 82, and as a result, the screw 47 moves along the screw shaft 47a (up and down in the figure). .

By adding this axial motion to the revolving motion of the screw 47, more favorable kneading of the resin material can be obtained.
Therefore, the cam groove 82 and the pin 81 are not essential, but are desired to be provided.
The cam groove 82 may be provided on the screw 47 side, and the pin 81 may be provided on the heating cylinder 46 side.

Also, in FIG. 2, the plate 42 may be omitted and the injection cylinder 43 may be placed directly on the slide plate 41 .
Also, in FIG. 2, the gear group 50 may be changed to a pulley and a belt.

The present invention is suitable for horizontal injection molding machines.

DESCRIPTION OF SYMBOLS 10... Horizontal injection molding apparatus, 20... Mold clamping apparatus, 20a... Mold clamping shaft, 30... Mold, 40... Injection apparatus, 43... Injection cylinder, 43a... Cylinder shaft, 46... Heating cylinder, 47... Screw, 47a... Screw shaft 56 Plunger 60 Material storage member 61 First horizontal cylinder 62 Vertical cylinder 64 Second horizontal cylinder 65 Third horizontal cylinder 66 Nozzle 73 Exit 74 Exit valve, 75... outlet valve driving means, D... outer diameter of screw, L... effective length of screw.

Claims (3)

A horizontal injection molding apparatus comprising a mold clamping device with a horizontal mold clamping axis for clamping a mold, and an injection device disposed on the side of the mold clamping device for injecting a resin material into the mold. hand,
The injection device includes a heating cylinder that incorporates a rotatable screw and heats the resin material to a predetermined temperature while agitating it; a material storage member that is connected to the heating cylinder and stores the resin material; a nozzle provided and extending to the mold; and an injection cylinder provided in the material storage member for injecting the resin material from the nozzle,
A cylinder axis of the injection cylinder extends horizontally,
The screw shaft of the screw extends vertically,
L/D of the screw is in the range of 0.5 to 3.0, where L is the effective length of the screw and D is the outer diameter of the screw;
the injection cylinder comprises a plunger,
The material storage member includes a first horizontal cylinder extending horizontally along the bottom of the heating cylinder, a vertical cylinder extending downward from the tip of the first horizontal cylinder, and the plunger extending horizontally from the lower part of the vertical cylinder. and a third horizontal cylinder extending horizontally from the bottom of the vertical cylinder coaxially with the second horizontal cylinder and having the nozzle at the tip thereof. Device. A horizontal injection molding apparatus according to claim 1, wherein
A horizontal injection molding apparatus, wherein the L/D is 1.0. The horizontal injection molding apparatus according to claim 1 or claim 2,
The heating cylinder has an outlet at the bottom for flowing out the resin material,
A horizontal injection molding apparatus, wherein an outlet valve for opening and closing the outlet is provided at the bottom of the heating cylinder or at the material storage member, and the outlet valve is moved by outlet valve driving means.

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