JP3090886B2 - Vertical injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical injection device driven by an electric motor.

[0002]

In an injection apparatus generally called an electric type, an electric motor is used as a drive source for nozzle touch, metering, injection, and the like. In the case of a horizontal molding machine, etc., the installation space for the electric motor can be sufficiently secured. Therefore, there is no particular problem in the installation even if three electric motors are used as the respective driving sources. In this case, the area of the machine base is limited, and it is desired to mount all the electric motors within the machine area of the vertical injection device as much as possible in view of stability.

The present invention has been conceived in order to solve the above-mentioned problem, and an object of the present invention is to provide an electric motor for metering and injection in a vertical direction, even if a plurality of electric motors are provided. Moreover, it is an object of the present invention to provide a new vertical injection device that can be compactly assembled by mounting the same at the same position so as not to interfere with each other.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided an injection apparatus in which a heating cylinder is placed vertically on a movable plate which can be moved up and down with respect to a mold plate on a machine base. An apparatus, wherein a lower plate and an upper plate to which the base end of the heating cylinder is connected are connected by a connecting rod at a required interval, and an injection plate having an injection screw attached to the connecting rod is movably inserted. And a driving unit that movably inserts and supports the lower and upper plates through a plurality of support shafts on the movable plate and supports the lower and upper plates vertically on the movable plate.
It is disposed rotatably over the movable platen and the lower plate,
A pair of moving screw shafts at opposite positions where lower ends are screwed into nuts provided in bearing members on the movable platen; and an injection plate mounted upwardly on a side of a bearing member integrally formed with the upper plate. An injection servomotor for rotating an injection ball screw shaft screwed with an upper cylindrical ball nut member, and a side portion of the injection plate in which a base shaft of the injection screw is rotatably mounted by penetrating the lower plate. A servo motor for measurement, which is mounted downward, and the servo motor for measurement and the servo motor for injection are vertically mounted on the same axis with a space for moving the servo motor for measurement. It is.

In the above configuration, the measuring servomotor and the injection servomotor are located along the side of the drive unit, and both motors fit in the injection operation space between the lower plate and the upper plate. As the height of the vertical injection device is reduced, the center of gravity is lowered and the device becomes stable.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 denotes a mold table fixed horizontally on an upper surface of a machine base 2, and 3 denotes a movable board, which is a mold clamping shaft which is vertically movable through four corners of the mold table 1 and also serves as a tie bar. It is fixed to the upper ends of 4 and 4, and is provided so as to be able to move up and down with respect to the mold table 1. 5
Is a vertical toggle-type mold clamping mechanism provided inside the machine base 2. The mold clamping operation plate 6 below the toggle, which expands and contracts up and down by using the mold table as a reaction force, is mounted on the mold clamping shafts 4 and 4. The lower ends are connected.

A mold 7 is divided and attached to the opposing surfaces of the mold placing plate 1 and the movable platen 3, and a sprue 8 is provided at the upper center of the divided mold on the movable platen side. A seat plate 9 is provided on the upper surface of the movable platen 3 so as to be slidable in the horizontal direction. On the seat plate 9, an injection device 10 is installed vertically with the heating cylinder 11 facing downward.

In the injection device 10, a lower plate 12 and an upper plate 13 connected to the base end of the heating cylinder 11 are connected by connecting rods 14, 14 at a required interval, and the rods 14, 14 are connected. Injection plate 1
5 are movably inserted and integrally formed with the drive shafts 16 and 16 erected at opposite corners of the seat plate 9.
The upper and lower plates 12, 13 are movably inserted and supported so as to be movable up and down with respect to the movable plate 3.

The vertical movement of the drive unit is performed by the rotation of a pair of ball screw shafts 17 for movement, which are disposed at positions opposite to each other and disposed between the movable platen 3 and the lower plate 12, and the ball screw shaft 17 for movement. , 17 are rotated by a moving motor 18 with a brake mounted downward on the side of the lower plate 12. This moving ball screw shaft 1
The upper end of each of 7, 7 is rotatably supported by the lower plate 12, and the shaft end protruding above the plate is provided with pulleys 19,1.
9 is attached. A drive belt 20 is wound around the pulleys 19 and 19 over a pulley 21 at a drive shaft end of the moving gear motor 18.

The lower end portions of the moving ball screw shafts 17, 17 are connected to the cylindrical bearing member 2 vertically provided on the upper surface of the seat plate 9.
The ball nut 23 is screwed into a ball nut 23 which is provided only upward in the interior of the heating cylinder 11 so that the tip of the heating cylinder 11 passes through the movable platen 3. The nozzle enters the hole 3a and descends together with the drive unit until the nozzle tip touches the sprue 8 of the mold 7.

A nozzle touch force holding device 40 is provided above the ball nut 23. This device includes a cover member 25 provided with a required space between the bearing member 22 and the fixed portion, a resilient spring member 24 housed therein and in contact with an upper end of a ball nut 23, A proximity switch 41 is mounted downward on the side of the switch 25 and a detector 42 mounted on the ball nut 23 in the space below the proximity switch.

A base shaft 26a of an injection screw 26 penetrating the lower plate 12 is rotatably mounted on the injection plate 15, and is mounted around the base plate 26a between the lower plate 12 and the injection plate 15. A drive belt 28 is attached to the measuring pulley 27,
Is wound around a pulley 30 at the drive shaft end of a measuring servomotor 29 mounted downward on the side of the measuring servomotor 29. A cylindrical ball nut member 37 protrudes from the upper part.

The upper plate 13 is formed integrally with a bearing member 32 of an injection ball screw shaft 31.
An injection servomotor 33 with a brake is mounted on the side of the second. The shaft portion of the injection ball screw shaft 31 is rotatably supported through the bearing member 32, and an injection pulley 34 is attached to a shaft end protruding above the bearing member. A drive belt 35 is wound around the injection pulley 34 and a pulley 36 at the drive shaft end of the injection servomotor 33.

The measuring servomotor 29 and the injection servomotor 33 are connected to the bearing member 32 and the injection plate 15.
And mounted on the motor mounting plates 32a and 15a which project horizontally in the same direction. The mounting is performed with the measuring servomotor 29 downward, the injection servomotor 33 upward, and the measuring servomotor 29.
Are mounted vertically on the same axis with a space for movement.

The screw shaft of the ball screw shaft 31 for injection is
The ball nut member 3 protrudes long below the bearing member 32 and is located at the lower end of the upper part of the injection plate 15.
7 and the injection plate 15 together with the ball nut 37 by the rotation of the screw shaft at a fixed position.
, And moves upward depending on the rotation direction. Accordingly, the injection screw 26 supported on the injection plate 15 also moves inside the heating cylinder 11.

In the molding machine having the above configuration, when the movable platen 3 is pulled down by the extension of the toggle of the mold clamping mechanism 5 and the mold 7 is clamped, the moving motor 18 starts.
The rotational force of the motor is transmitted to the moving ball screw shafts 17, 17 by the drive belt 28, and the moving ball screw shafts 17,
Reference numeral 17 denotes the forward rotation of the ball nut 2 in the bearing member 22.
3 moves downward. Thereby, the lower plate 12
Is pulled, and the drive unit is connected to the support shafts 16, 16.
Is used as a guide to perform nozzle touch.

Ball screw shaft 1 for movement even after touching the nozzle
When the rotational torque acts on the shafts 7 and 17, the ball screw shafts 17 for movement rotate at a fixed position, so that the ball nut 23 moves upward to compress the resilient spring member 24 and to move the ball screw shafts 17 and 17 close to each other. When the distance between the switch 41 and the detection body 42 is reduced, the proximity switch 41 is operated, and the moving gear motor 18 is stopped, and at the same time, the brake is operated to stop the rotation of the moving ball screw shafts 17 and 17 and to reverse the rotation due to the load of the driving unit. The rotation is prevented. For this reason, the repelling force due to the bending of the resilient pressure spring member 24 becomes the nozzle touch force, and the spring force also responds to the thermal expansion, so that the nozzle touch force is kept substantially constant.

When the nozzle touch is completed, the injection servomotor 33 is started, and the rotational force is transmitted to the injection ball screw shaft 31 by the drive belt 35, and is rotated together with the ball nut member 37 by the forward rotation of the screw shaft. Then, the injection plate 15 and the measuring servomotor 29 move downward. As a result, the lower injection screw 26 also moves downward and moves forward in the heating cylinder 11 to inject and fill a cavity in the mold formed by clamping the pre-weighed molding material.

When the pressure holding after injection filling is completed, the measuring servomotor 29 is started while the nozzle is touched, and the injection servomotor 33 is rotated in the opposite direction to apply back pressure to the injection screw 36. The rotational force of the measuring servomotor 29 is controlled by the drive belt 28 so that the injection screw 26
The injection screw 26 is rotated by a rotation of the supply port 38.
While plasticizing the molding material from above, the material is moved backward by the material pressure and weighed. This backward movement is performed while pushing up the injection plate 15 together with the servomotor 29 for measurement.
When the weighing is completed, the weighing servomotor 29 is stopped, and the injection servomotor 33 is again rotated in the forward direction to move the injection screw 26 forward to inject the weighing material.

When the nozzle touch is released after the injection, both servomotors are stopped, then the brake of the moving gear motor 18 is released, and the motors are started in the opposite direction. As a result, the moving ball screw shafts 17, 17 rotate in the reverse direction to move upward, push up the lower plate 12, and move up the drive unit. When the vehicle has moved up to the predetermined position, the moving motor 18 is stopped, and at the same time, the brake is applied.
The ball screw shaft for movement 17, which receives the entire weight of the drive unit,
17 keeps the braking state so that the load 17 does not self-rotate and descend.

[Brief description of the drawings]

FIG. 1 is a side view of a vertical molding machine provided with a vertical injection device according to the present invention.

FIG. 2 is a front view of the vertical injection device according to the present invention.

FIG. 3 is a side view of the same.

FIG. 4 is a schematic plan view of the same.

FIG. 5 is a schematic sectional view taken along line AA of FIG. 2;

FIG. 6 is a schematic sectional view taken along line BB of FIG. 2;

FIG. 7 is a schematic sectional view taken along line CC of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mold placing table 2 machine base 3 movable plate 4 mold clamping shaft 5 mold clamping mechanism 10 injection device 11 heating cylinder 12 lower plate 13 upper plate 14 connecting rod 15 injection plate 15a motor mounting plate 16 support shaft 17 moving ball screw shaft 18 Moving motor 22 Bearing member 23 Ball nut 28 Injection screw 31 Injection ball screw shaft 32 Bearing member 32a Motor mounting plate 33 Injection servomotor 35 Injection drive belt 37 Ball nut member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-84792 (JP, A) JP-A-4-193515 (JP, A) JP-A-4-64422 (JP, A) 9819 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/00-45/24 B29C 45/46-45/84

Claims (1)

(57) [Claims] 1. An injection device which is vertically installed with a heating cylinder facing down on a movable plate provided so as to be capable of ascending and descending with respect to a mold placement plate on a machine base, wherein a base end of the heating cylinder is provided. The lower plate and the upper plate are connected by a connecting rod at a required interval, and an injection plate with an injection screw is movably inserted into the connecting rod, and the lower and upper plates are placed on a movable platen. A drive unit movably inserted into and supported by a plurality of support shafts and supported on the movable platen so as to be movable up and down, and a rotatable arrangement over the movable platen and the lower plate, and a lower end bearing on the movable platen. A pair of moving screw shafts at opposite positions screwed with a nut provided in the member, and a cylindrical ball nut member mounted on the side of a bearing member integrally formed with the upper plate and facing upward, above the injection plate; For injection screwed with An injection servomotor that rotates a ball screw shaft, and a measuring servomotor that is downwardly mounted on a side portion of the injection plate in which a base shaft of the injection screw is rotatably mounted by penetrating the lower plate. The servo motor for measurement and the servo motor for injection are
A vertical injection device characterized by being vertically mounted on the same axis with a space for moving the servomotor for measurement.