JP7233487B2 - Vertical injection molding machine - Google Patents

Description

The present invention relates to a technique for reducing the height of a vertical 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 vertical injection molding apparatuses are known (see, for example, Patent Document 1 (FIG. 9)).

Patent Literature 1 will be described with reference to the following drawings.
FIG. 10 is a front view of a conventional vertical injection molding apparatus.
The vertical injection molding apparatus 100 includes a mold clamping shaft 101 that is vertical, a mold clamping device 110 that clamps the mold 102 while opening and closing it, and an injection device 120 that injects a resin material into the clamped mold 102. and are the main elements.

The mold clamping device 110 includes a fixed platen 112 mounted on a machine base 111, a movable platen 113 arranged on the fixed platen 112 so as to be vertically movable, and a fixed platen 112 extending downward from the movable platen 113. It consists of a tie bar 114 that passes through and a toggle mechanism 115 that raises and lowers the tie bar 114 .

When the tie bars 114 and the movable platen 113 are pulled down by the toggle mechanism 115, the mold 102 is clamped, and when the tie bars 114 and the movable platen 113 are pushed up, the mold 102 opens.

The injection device 120 includes a heating cylinder 121 arranged on a movable platen 113, an injection machine moving cylinder 122 for moving the heating cylinder 121 up and down, a screw 123 incorporated in the heating cylinder 121, and the screw 123. A screw rotation motor 124 for turning and an injection motor 125 for moving the screw 123 along the vertical axis (mold clamping axis 101) are the main elements.

The resin material put into the heating cylinder 121 is plasticized and weighed by rotating the screw 123 with the screw rotation motor 124 .
The heating cylinder 121 is lowered by the injection machine moving cylinder 122 , and the tip (lower end) nozzle 126 is brought into contact with the mold 102 .
The injection motor 125 lowers the screw 123 along the vertical axis to inject the resin material into the mold 102 .

The vertical injection molding apparatus 100 having such a structure is widely used because of the fact that a plurality of apparatuses can be installed side by side because of the small floor space.
However, the height (total height) H1 of the vertical injection molding apparatus 100 is considerably large. If it cannot be installed in the existing building, it is necessary to build a new building or renovate it significantly.

Considering installation in a relatively low existing building, it is desirable to reduce the height of even a vertical injection molding apparatus.

JP 2016-34751 A

An object of the present invention is to provide a vertical injection molding apparatus with a significantly reduced height.

The invention according to claim 1 is composed of a mold clamping device having a vertical mold clamping axis for clamping a mold, and an injection device disposed on the mold clamping device for injecting a resin material into the mold. A vertical injection molding device 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 screw shaft of the screw extends vertically,
A cylinder axis of the injection cylinder extends horizontally ,
The injection device includes an injection platen arranged above the mold clamping device, a screw drive platen arranged above the injection platen for suspending the heating cylinder and the injection cylinder, and the injection platen and the screw drive platen. and injection positioning means for vertically moving the
the injection positioning means comprises a cylinder and a piston rod axially movable with respect to the cylinder;
The cylinder is characterized in that it also serves as a connecting member that connects the screw driving platen to the injection platen .

The invention according to claim 2 is the vertical injection molding apparatus according to claim 1,
L/D does not exceed 3, where L is the effective length of the screw and D is the outer diameter of the screw.

The invention according to claim 3 is the vertical injection molding apparatus according to claim 2,
The L/D is 1.0.

The invention according to claim 4 is the vertical injection molding apparatus according to any one of claims 1 to 3,
The heating cylinder is provided with an outlet through which the resin material flows out and an outlet valve for opening and closing the outlet at the bottom, and the outlet valve is moved by outlet valve driving means.

The invention according to claim 5 is the vertical injection molding apparatus according to claim 1,
the injection cylinder comprises a plunger,
The material storage member includes a first horizontal cylinder that accommodates the plunger while extending horizontally, a vertical cylinder that extends downward from the tip of the first horizontal cylinder, and a vertical cylinder that extends from the middle in the height direction to the heating cylinder. and a second horizontal tube.

In the invention according to claim 1, in the injection unit of the vertical 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 heating cylinder vertically, the liquid resin material can be accumulated at the bottom of the heating cylinder while uniformly heating the resin material. The entire injection cylinder is long. By placing this long injection cylinder horizontally, the height dimension of the injection device can be reduced.
As a result, the height dimension of the injection device can be reduced while maintaining the quality of the resin material.
That is, the present invention provides a vertical injection molding apparatus with a low height.
In addition, in the invention according to claim 1, the cylinder of the injection positioning means also serves as a connecting member for connecting the screw drive plate to the injection plate. Compared to the case where a connecting member is provided separately, the present invention can reduce the number of parts and reduce the weight of the injection device.

In the invention according to claim 2, L/D of the screw is set not to exceed 3. By setting the effective length L of the screw to 3 or less, an increase in the height dimension of the injection device is prevented.

In the invention according to claim 3, 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 4, the heating cylinder is provided with an outlet through which the resin material flows out at the bottom and an outlet valve for opening and closing the outlet, 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.

In the invention according to claim 5 , the material storage member includes a first horizontal cylinder that extends horizontally and stores the plunger, a vertical cylinder that extends downward from the tip of the first horizontal cylinder, and a middle cylinder in the height direction of the vertical cylinder. and a second horizontal tube extending from to the heating tube.
The injection cylinder can be placed horizontally in the middle of the heating cylinder in the height direction, and the injection device can be made compact.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the vertical injection molding apparatus which concerns on this invention. FIG. 2 is a view taken along line 2-2 of FIG. 1; 1 is a cross-sectional view of an injection device according to the present invention; FIG. It is a figure explaining an effect|action of an injection device. 4 is an enlarged cross-sectional view of a main part of the injection device; FIG. It is a figure explaining direction of a screw axis. FIG. 6 is an expanded view of a cross section taken along line 7-7 of FIG. 5; FIG. 4 is a flow chart explaining the operation of the injection device; It is a figure explaining the height of a vertical injection molding apparatus. It is a figure which shows the whole structure of the conventional vertical 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 vertical injection molding apparatus 10 includes a mold clamping device 20 having a vertical mold clamping shaft 20a for clamping a mold 12 consisting of a lower mold 13 and an upper mold 14; The main element of this device is an injection device 50 arranged on the clamping device 20 .

The mold clamping device 20 includes a bed 21 fixed to a floor (or a machine base) 16, a pressure receiving plate 22 fixed to the bed 21, a turntable 23 placed on the pressure receiving plate 22, and a platen below the pressure receiving plate 22. a traction platen 25 arranged in the pressure platen 22 and raised and lowered by a half nut position adjusting means 24 provided on the pressure platen 22; a half nut 26 arranged below the traction platen 25; A movable platen 28 which is moved up and down by the provided mold opening/closing means 27, a tie bar 31 which is lowered from the movable platen 28 and passes through the pressure receiving plate 22 and the traction platen 25, pressure to the half nut position adjusting means 24, the mold opening/closing means 27 and the like. A pump motor unit 32 is provided for the controlled supply of oil.

The half nut position adjusting means 24 is preferably a half nut position adjusting hydraulic cylinder 24A. Similarly, the mold opening/closing means 27 is preferably a mold opening/closing hydraulic cylinder 27A.

The pressure receiving plate 22 can be removed from the bed 21 by loosening bolts or the like. Therefore, "fixation" in the present invention includes not only complete fixation but also separably bonded forms.
Also, the half nut position adjusting means 24 and the mold opening/closing means 27 may be provided on the bed 21 without any problem.

The traction board 25 has, for example, a mold clamping cylinder 33 that opens upward. A piston portion 34 extending downward from the pressure receiving platen 22 is accommodated in the mold clamping cylinder 33 . A pressure oil chamber 35 is formed between the mold clamping cylinder 33 and the piston portion 34 . When pressure oil is supplied to the pressure oil chamber 35, the traction board 25 is lowered.

The tie bar 31 is provided with an engaging portion 36 at its lower end. This engaging portion 36 is, for example, a sawtooth portion. Hereinafter, the engaging portion 36 is read as the sawtooth portion 36 .
The half nut 26 is a half-split nut that engages (engages) with the sawtooth portion 36 as an engaging portion. The half nut 26 is opened and closed by half nut opening/closing means 37 provided on the traction board 25 . The half nut opening/closing means 37 is preferably a half nut opening/closing hydraulic cylinder 37A.

It is preferable that the teeth of the saw-toothed portion 36 are arranged at regular pitches like bamboo knots. The teeth may be rectangular, trapezoidal, or triangular in cross section. The half nut 26 is provided with corresponding teeth.

Tie bars 31 and half nuts 26 are made of strong, hard steel. Grease lubrication is provided between the serrations 36 and the half nut 26 to facilitate steel-to-steel contact. At a position higher than the sawtooth portion 36, the outer peripheral surface of the tie bar 31 is lubricated. The grease runs down and reaches the serrations 36 . Greasing may be automatic or manual.

Preferably, a half nut operation monitoring mechanism 38 for monitoring the operation of half nut 26 is provided near half nut 26 . However, on the condition that the mold opening/closing means 27 and the half nut position adjusting means 24 can be accurately controlled, the half nut operation monitoring mechanism 38 may be omitted.

Arbitrary sensors, such as a proximity switch and a limit switch, can be used for the half nut operation monitoring mechanism 38 . Proximity switch is a non-contact sensor that determines "object is present" when the mating metal approaches within a certain distance, and "no object" when the mating metal is beyond a certain distance. The half nut 26 is wet with waste grease, but if it is a non-contact type sensor, there is no fear of erroneous detection. Moreover, it is inexpensive. Proximity switches are therefore recommended.

A tray 41 is preferably positioned below the halfnuts 26 and on the floor 16 to receive the waste grease. The tray 41 is a dish-shaped container. Regularly or as needed, the tray 41 is pulled out and accumulated waste grease is treated to prevent the floor 16 from being soiled.

Preferably, bed 21 is surrounded by cover 42 . This cover 42 serves as a safety cover. By surrounding the bed 21 with the cover 42, the appearance of the mold clamping device 20 is enhanced. However, the cover 42 is not essential because it can be replaced by a safety fence or the like.

FIG. 2 is a view taken along arrow 2-2 in FIG.
As shown in FIG. 2, the tie bars 31 are arranged at the vertices of the triangle. Among them, one tie bar 31 constitutes the center of rotation of the turntable 23 .
At the product take-out position 17 , the resin molded product is taken out from the lower mold 13 . The empty lower mold 13 is moved to the mold clamping position 18 by rotating the turntable 23 by 180°.
Since the work of removing the product and the work of clamping the mold can be performed in parallel, the use of the turntable 23 can improve productivity.

However, the turntable 23 can be replaced with a carriage that reciprocates between the mold clamping position 18 and the product unloading position 17 . In this case, it is desirable to use four tie bars 31 .
Alternatively, the turntable 23 and the carriage may be omitted. Also in this case, it is desirable to use four tie bars 31 .

Therefore, in the mold clamping device 20, the number of tie bars 31 can be freely determined, and it is optional whether or not the turntable 23 is provided and whether or not the carriage is provided.

In the mold clamping device 20 of FIG. 1, the half nut 26 is opened and separated from the serrated portion 36 . Next, the mold opening/closing means 27 is extended to raise the movable platen 28 . As the movable platen 28 rises, the upper die 14 separates from the lower die 13 and the tie bars 31 rise.

Next, the injection device 50 will be described.
As shown in FIG. 3, the injection device 50 includes an injection platen 51 arranged above the movable platen 28 at a predetermined distance from the movable platen 28, and a piston rod 52a extending downward from the injection platen 51. A fixed injection positioning means 52, a screw drive platen 53 arranged above the injection platen 51 at a constant distance from the injection platen 51 so as to be connected by a cylinder 52b of the injection positioning means 52, and this The main elements are an injection cylinder 54, a screw rotating motor 55 and a heating cylinder 56 attached to a screw driving platen 53, and a material storage member 58 that spans the injection cylinder 54 and heating cylinder 56 and has a nozzle 57 at its lower end. do.

The injection cylinder 54 is fixed to the screw driving platen 53 with bolts or the like. It should be noted that there is no problem in fixing the injection cylinder 54 to the lower injection plate 51 by inserting a leg (or a spacer or a seat) between the injection cylinder 54 and the lower injection plate 51 .
Since the injection cylinder 54 is a strength member with high rigidity, it serves as a connecting member between the injection platen 51 and the screw driving platen 53 .

The injection cylinder 54 incorporates a piston 61 and a plunger 62 extends from one surface of the piston 61 into the material storage member 58 . A rod 63 extends from the other surface of the piston 61 to the outside of the cylinder. The position of this rod 63 is monitored by a weighing sensor 64 . That is, the rod 63 and the weighing sensor 64 detect that the plunger 62 has retreated and the "weighing" of the resin material has been completed.

The injection cylinder 54 is preferably a hydraulic cylinder, and is arranged so that the cylinder axis 54a is horizontal. The injection cylinder 54 becomes longer when the piston rod (plunger 62) is included. By placing the long injection cylinder 54 horizontally, the height dimension from the injection platen 51 to the screw driving platen 53 can be reduced.

A servomotor is suitable for the screw rotation motor 55 . A small-diameter pulley 65 is provided on the motor shaft of the screw rotating motor 55, a large-diameter pulley 67 is provided on the screw 66, and a belt 68 is passed between the pulleys. The pulley diameter of the large-diameter pulley 67 is five to ten times the pulley diameter of the small-diameter pulley 65 . Then, the speed reduction ratio becomes 1/5 to 1/10, and the screw 66 is rotated at low speed. Belt 68 is preferably a timing belt.

The heating cylinder 56 is fixed to the screw driving plate 53 with a bolt or the like such that the shaft (screw shaft 66a) is vertical.
Further, the screw 66 is rotatably attached to the screw drive platen 53 via a bearing 71 . The screw 66 may be configured to be movable in the axial direction (vertical direction) by a predetermined distance.

The heating cylinder 56 has a hopper 72 , and the resin material is introduced into the heating cylinder 56 using the hopper 72 . The hopper 72 is arranged at a location that does not interfere with the large-diameter pulley 67 and belt 68 .

In FIG. 3, the nozzle 57 is touching the mold (FIG. 1, reference numeral 12). From this state, the injection positioning means 52 is extended. Then, the ejection platen 51 and the like move upward so as to separate from the movable platen 28 . As a result, as shown in FIG. 4, the nozzle 57 is sufficiently separated from the mold. When the injection positioning means 52 is retracted, it returns to FIG.
4 uses the reference numerals of FIG. 3, and detailed description thereof is omitted.

In addition, the cylinder 52b of the injection positioning means 52 also serves as a connecting member for connecting the screw driving platen 53 to the injection platen 51. As shown in FIG. Compared to the case where a connection member is provided separately, the weight of the injection device 50 can be reduced while reducing the number of parts according to the present embodiment.

Details of the material storage member 58 and the screw 66 will be described with reference to FIG.
As shown in FIG. 5, the material storage member 58 includes a first horizontal cylinder 74 extending horizontally to accommodate the plunger 62 and a vertical cylinder extending downward from the tip of the first horizontal cylinder 74 to accommodate the shut valve 75 . 76 and a second horizontal tube 77 extending from the middle of the vertical tube 76 in the height direction to the heating tube 56 .

A plunger 62 can be placed horizontally at a height in the middle of the heating cylinder 56 in the height direction. That is, as shown in FIG. 4, the injection cylinder 54 can be placed horizontally in the middle of the heating cylinder 56 in the height direction, and the height dimension of the injection device 50 can be reduced.

As shown in FIG. 5, a heater 78 is wound around the outer periphery of the heating cylinder 56, and the heater 78 keeps the heating cylinder 56 at a predetermined temperature.
A heater 84 is wound around the outer periphery of the material storage member 58, and the heater 84 keeps the material storage member 58 at a predetermined temperature.

A shut valve drive means 79 is provided on the upper surface of the vertical tube 76, and the shut valve drive means 79 moves the shut valve 75 from the valve closed position to the valve open position.

A pressure block 89 is lowered from the screw drive platen 53 and prevents the material storage member 58 (particularly the vertical tube 76) from moving upward. A pressure receiving block 89 can receive the back pressure (or upward force) when the nozzle 57 touches the mold (lower mold 14 in FIG. 1).

The bottom of the heating cylinder 56 is provided with an outlet passage 81 connected to the outlet 56 c and the second horizontal cylinder 77 , and an outlet valve 82 is placed in the outlet passage 81 . The outlet valve 82 is moved from the valve closed position to the valve open position by the outlet valve driving means 83 .

Even if a general-purpose check valve is provided at the outlet 56c of the heating cylinder 56, 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 82 is forcibly moved by the outlet valve drive means 83 . The forcibly moved outlet valve 82 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 screw 66 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 66 .
If the L/D of the screw 66 is 1.0, the length of the screw 66 is sufficiently short and the height dimension of the injection device 50 can be made smaller.

Conventionally, screws used in injection devices have an L/D of 10 to 20 and an outer diameter D of small diameter. A long screw with a small diameter is rotated at high speed.
In contrast, the screw 66 according to the present invention has a much larger outer diameter D and a much shorter length L.

The resin material moves along the spiral groove formed on the outer periphery by the screw 66 . The peripheral speed of the screw 66 is directly proportional to the outer diameter D. When the peripheral speeds of the conventional and the present invention are matched, the screw 66 according to the present invention can be rotated at a sufficiently low speed.

Note that the L/D of the screw 66 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. Further, when L/D exceeds 3.0, it is necessary to widen the distance between the injection platen 51 and the screw driving platen 53 shown in FIG.
Therefore, the L/D of the screw 66 should be in the range of 0.5 to 3.0, preferably 1.0.

Moreover, preferably, the tip (lower end) of the screw 66 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 56 . The swirling force further agitates the liquid resin material, thereby achieving further uniformity of temperature and further homogenization of the material.

Next, the reason for arranging the screw 66 vertically will be explained based on FIG.
As shown in FIG. 6A, a comparative example in which the screw 66 and the heating cylinder 56 are arranged so that the screw shaft 66a is horizontal will be considered.
First, in the heating barrel 56, the upper portion 56b becomes hotter than the lower portion 56a. 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 56 a of the heating cylinder 56 . It becomes difficult to smoothly take out from the outlet 56c of the heating cylinder 56. - 特許庁

As shown in FIG. 6(b), an example in which the screw 66 and the heating cylinder 56 are arranged such that the screw shaft 66a is vertical will be considered.
First, after the resin material is put into the heating cylinder 56, it flows down toward the outlet 56c while being heated, kneaded and compressed. A temperature difference occurs between the upper portion and the lower portion along the screw shaft 66a, but no temperature difference occurs on the surface orthogonal to the screw shaft 66a. Therefore, temperature unevenness does not occur in the resin material.
Second, the liquid material collects at the bottom of the heating cylinder 56 . It becomes easy to smoothly take out from the outlet 56c of the heating cylinder 56. - 特許庁
From the above, it is preferable to arrange the screw shaft 66a vertically.

The reason why the screw shaft 66a is arranged vertically in FIG. 3 is as described in FIG.
Also, in FIG. 3, the injection cylinder 54 has a laterally long overall length considering the long projecting plunger 62 (and rod 63). By arranging the long injection cylinder 54 with its axis horizontal, the height dimension of the injection device 50 can be reduced.
In the screw 66 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 50 even though the screw 66 is arranged so that the shaft is vertical. can.

FIG. 7 shows an expanded view of the 7-7 line cross section of FIG.
Preferably, the heating cylinder 56 is provided with a vertically meandering cam groove 85 . The meandering height (amplitude) W is based on one pitch of the spiral groove of the screw 66 shown in FIG. W may be set within the range of (0.2 to 1.0)×helical groove pitch.
A pin 86 may be provided on the screw 66 , the pin 86 may be dropped into the cam groove 85 from the notch 87 shown in FIG.

During one rotation of the screw 66, the pin 86 moves "0°→180°→360°". As a result, the screw 66 moves up and down by W, that is, along the screw axis 66a.
By adding this axial motion to the helical motion of the screw 66, more favorable kneading of the resin material can be obtained.
Therefore, although the cam groove 85 is not essential, it is desirable to provide it.

The operation of the injection device 50 configured as described above will be described with reference to FIG.
In ST01 of FIG. 8 (step number 01, the same applies hereinafter), the outlet valve is opened. That is, in FIG. 5, outlet valve 82 is moved to open outlet 56c.
At ST02, the shut valve is closed. That is, in FIG. 5, the shut valve 75 is moved to close the nozzle 57 .
In ST03, back pressure control of the injection cylinder is performed. That is, in FIG. 1, the back pressure control of the injection cylinder 54 is started by the pump motor unit 32 so that a predetermined reaction force (resistance force) is applied to the plunger.

In ST04, the resin material is plasticized while rotating the screw. In FIG. 5, the resin material flows through the outlet 56c, the outlet passage 81, the second horizontal tube 77, and the vertical tube 76 in order, and fills them. Due to this filling, the plunger 62 is gradually retracted (moved to the right in the drawing). The resin material is weighed according to the following equation: cross-sectional area of plunger 62 x travel distance of plunger 62 = 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).
The shut valve 75 is opened, the plunger 62 advances, and the resin material is injected from the nozzle 57 (ST09).
When it is confirmed in ST10 that the injection has ended, the shut valve is closed (ST11).

Advantages of the vertical injection molding apparatus 10 according to the present invention will now be described with reference to FIG.
FIG. 9(a) shows a conventional vertical injection molding apparatus 100. As shown in FIG. FIG. 9(b) shows a vertical injection molding apparatus 10 according to the present invention.
The height H2 of the vertical injection molding apparatus 10 is approximately half the height H1 of the conventional vertical injection molding apparatus 100 .
If the height is 1/2, the vertical injection molding apparatus 10 according to the present invention can be easily installed in a building with a low ceiling height or an existing building.

A conventional mold clamping device 110 shown in FIG. 9(a) is of a toggle link type. On the other hand, the mold clamping device 20 shown in FIG. 9(b) is of the half-nut system. The height dimension can be made smaller with the half-nut method than with the toggle link method.
This difference in method contributes to reducing the height of the vertical injection molding apparatus 10 .

The half nut positioning means 24, the mold opening/closing means 27, and the half nut opening/closing means 37 are preferably hydraulic cylinders, but may be electric cylinders formed by combining a ball screw and an electric motor.
Similarly, the injection positioning means 52, the shut valve driving means 79, and the outlet valve driving means 83 are preferably hydraulic cylinders, but may be electric cylinders that combine a ball screw and an electric motor.

If the half nut positioning means 24, mold opening/closing means 27, half nut opening/closing means 37, injection positioning means 52, shut valve driving means 79, outlet valve driving means 83 are hydraulic cylinders, as shown in FIG. It is controlled by the pump motor unit 32 .

INDUSTRIAL APPLICABILITY The present invention is suitable for a vertical injection molding apparatus.

DESCRIPTION OF SYMBOLS 10... Vertical injection molding apparatus, 20... Mold clamping apparatus, 20a... Mold clamping shaft, 50... Injection apparatus, 51... Injection platen, 52... Injection positioning means, 52a... Piston rod, 52b... Cylinder, 53... Screw driving platen , 54... injection cylinder, 54a... cylinder shaft, 56... heating cylinder, 56c... outlet, 57... nozzle, 58... material storage member, 62... plunger, 66... screw, 66a... screw shaft, 74... first horizontal cylinder, 76... Vertical tube, 77... Second horizontal tube, 82... Outlet valve, 83... Outlet valve driving means, D... Outer diameter of screw, L... Effective length of screw, H2... Height of vertical injection molding apparatus.

Claims (5)

A vertical injection molding apparatus comprising a mold clamping device having a vertical mold clamping axis for clamping a mold, and an injection device disposed above 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 screw shaft of the screw extends vertically,
A cylinder axis of the injection cylinder extends horizontally ,
The injection device includes an injection platen arranged above the mold clamping device, a screw drive platen arranged above the injection platen for suspending the heating cylinder and the injection cylinder, and the injection platen and the screw drive platen. and injection positioning means for vertically moving the
the injection positioning means comprises a cylinder and a piston rod axially movable with respect to the cylinder;
A vertical injection molding apparatus , wherein the cylinder also serves as a connecting member for connecting the screw driving platen to the injection platen . The vertical injection molding apparatus according to claim 1,
A vertical injection molding apparatus, wherein L/D does not exceed 3, where L is the effective length of the screw and D is the outer diameter of the screw. The vertical injection molding apparatus according to claim 2,
A vertical injection molding apparatus, wherein the L/D is 1.0. The vertical injection molding apparatus according to any one of claims 1 to 3,
A vertical injection molding apparatus, wherein the heating cylinder is provided with an outlet through which the resin material flows out and an outlet valve for opening and closing the outlet, and the outlet valve is moved by outlet valve driving means. The vertical injection molding apparatus according to claim 1,
the injection cylinder comprises a plunger,
The material storage member includes a first horizontal cylinder that accommodates the plunger while extending horizontally, a vertical cylinder that extends downward from the tip of the first horizontal cylinder, and a vertical cylinder that extends from the middle in the height direction to the heating cylinder. A vertical injection molding apparatus comprising a second horizontal cylinder.

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