JPH07100876A - Injection unit for injection molding machine - Google Patents

Abstract

PURPOSE:To provide a cover for an injection unit which can achieve the operation at low cost without losing the original function as a cover and which is effective to make the injection unit compact. CONSTITUTION:An injection unit 3 consists of a main body 33 comprising a front plate 13, a pusher plate 15 and a rear plate 14, a metering motor 21, an injection motor 26 and transmission means 35 and 36 for the motor. The main body 33, the metering transmission means 35 located in the vicinity of an output shaft of the metering motor 21 and the injection transmission means 36 connecting the output shaft of the injection motor 26 with an injection mechanism are covered by individual covers 34, 35 and 36 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for an injection unit in an injection molding machine.

[0002]

2. Description of the Related Art As shown in FIG.
The mold clamping unit 2 and the injection unit 3 are provided, and these are arranged and supported so as to face each other on the base 4. As is well known, in the mold clamping unit 2, a moving platen 8 is movably arranged in the front-rear direction between a front platen 6 and a rear platen 7 which are joined by a tie bar 5, and a space between the front platen 6 and the moving platen 8 is a mold clamping space. At the same time, the moving platen 8 and the rear platen 7 are connected by a mold clamping mechanism such as a toggle link 9. The mold clamping mechanism is driven by a mold clamping motor 10 attached to the rear platen 7 side. Then, the process of mold opening and closing in the operation of the injection molding machine 1 (mold opening, mold closing and lockup)
Then, the mold clamping motor 10 drives the mold clamping mechanism, and the moving platen 8 moves back and forth to open and close the mold. In this case, the movement of each member is dangerous to the operator, in order to prevent the scattering of the lubricating oil and the temperature control liquid, and to improve the commercial value by collecting the appearance of the mold clamping unit 2 and improving the commercial value. The entire clamping unit 2 is covered with the mold clamping section cover 11 (the thick line range in FIG. 3).

In the injection unit 3, as shown in FIG. 4, a pusher plate 15 is arranged between a front plate 13 and a rear plate 14 connected by a tie rod 12 so as to be movable in the front-rear direction. A cylinder assembly 16 is attached to the front plate 13, a screw sleeve 17 is provided on the front surface of the pusher plate 15, and
A ball nut 18 is fixed to the rear surface. The screw sleeve 17 is provided with a base portion of an injection / measurement screw 19 attached to the cylinder assembly 16. The front part of the rear plate 14 is a ball nut 18
A ball screw 20 that is screwed into is rotatably supported at a fixed position.

A measuring motor 21 is attached to the pusher plate 15, and a screw sleeve 17 is attached.
, A drive pulley 22 fixed to the output shaft of the measuring motor 21, a driven pulley 23 fixed to the screw sleeve 17, and a timing transmission means 25 including a timing belt 24 connecting them. Further, an injection motor 26 is attached to the rear plate 14, a ball screw 20, a drive pulley 27 fixed to the output shaft of the injection motor 26, a driven pulley 28 fixed to the ball screw 20, and a combination thereof. They are connected by an injection transmission means 30 composed of a timing belt 29.

Further, the entire injection unit 3 is movable back and forth on the base 4 for touching and releasing the nozzle, and purging and cylinder assembly 1 are performed.
It is possible to swivel (horizontal rotation) on the extruder base 31 (FIG. 3) in order to replace 6.

In the injection process of the injection molding machine, the measuring motor 21 is driven to rotate the screw 19 through the measuring transmission means 25, and the injection motor 26 is driven to drive the injection transmission means 30 and the balls. The pusher plate 15 is moved back and forth via the screw 20. And
As in the case of the mold clamping unit 2, the danger that the injection unit 3 is operating and the scattering of lubricating oil is prevented, and the injection unit 3
The entire injection unit 3 is covered with the injection section cover 32 (thick line portion) from the viewpoint of collecting the appearance and improving the commercial value.

Clamping portion cover 11 and injection portion cover 3
As for the mold clamping unit cover 11, it is relatively easy to cover the mold clamping unit 2 with the cover 11 because the mold clamping unit 2 does not move back and forth during injection molding. Is. Also, the mold clamping unit 2
Since there are few irregularities as a whole, even if the whole is covered, it is unlikely that the cover 11 will unnecessarily become large by enclosing a useless space inside. Further, the power required for the mold clamping motor 10 is 1/2 to 1 that of the injection motor 26.
Since the amount of heat generated is about / 3 and the amount of heat generated is relatively small, there is no particular problem in removing heat even if the entire portion including the motor portion is covered with the cover 11.

However, in the case of the injection section cover 32, the injection unit 3 is moved back and forth due to the nozzle touch,
Further, since the swivel is performed, it is difficult to design and attach the cover that covers the whole, and the cost of the injection unit cover 32 is high. Further, since the metering motor 21 and the injection motor 26 are laterally or upwardly bulged, or the like, the overall shape has large irregularities, so the cover 32 that covers the whole becomes large to enclose a useless space (FIG. 4). ), It is difficult to handle and goes against the compactness of the injection molding machine. Further, the injection unit 3 includes the metering motor 21 and the injection motor 26, and the power required for the injection motor 26 is large and the amount of heat generated is also large. Therefore, it is originally not preferable to cover with a cover.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cover for an injection unit, which can be achieved at a low cost without losing its original function and which is effective for making the injection unit compact. .

[0010]

A body having a front plate, a pusher plate, and a rear plate is provided. The screw sleeve on the front of the pusher plate and the output shaft of the weighing motor are connected by the weighing transmission means.
The injection ball screw pivotally supported on the rear plate and the output shaft of the injection motor are connected by the injection transmission means. Body,
The measuring transmission means and the injection transmission means near the output shaft of the measuring motor are covered with individual covers.

[0011]

The structure in which the main body, the weighing transmission means near the output shaft of the weighing motor, and the injection transmission means are covered with individual covers, respectively, eliminates waste in the cover of the injection unit, and also reduces the weight of the injection motor. Improve the heat dissipation effect of the motor.

[0012]

1 shows an injection unit 3, a main body 33 having a front plate 13, a pusher plate 15 and a rear plate 14 as in the conventional case, a weighing motor 21 attached to the pusher plate 15 and a rear plate 14. And an injection motor 26 attached to the. The front plate 13 and the rear plate 14 are connected by a tie rod 12, and a pusher plate 15 is attached to the tie rod 12 so as to be movable in the front-rear direction.

A cylinder assembly 16 is mounted on the front surface of the front plate 13 and is mounted inside the weighing / measuring / measuring unit.
The base of the injection screw 19 projects rearward of the front plate 13. A screw sleeve 17 is rotatably supported at a fixed position on the front surface of the pusher plate 15, and a base portion of a screw 19 is attached to the screw sleeve 17. The screw sleeve 17 is connected to the output shaft of the measuring motor 21 by the measuring transmission means 25. Measuring transmission means 2
5 is a drive pulley 22 attached to the output shaft of the metering motor 21, a driven pulley 23 attached to the screw sleeve 17, and a timing belt 24 wound around these pulleys 22, 23 in this embodiment.
It is composed of.

A ball screw 20 for injection is arranged on the rear plate 14 in the front-rear direction and is rotatably supported at a fixed position. The output shaft of the injection motor 26 and the transmission means 3 for injection are provided.
They are connected with 0. The injection transmission means 30 is the injection motor 26 in this embodiment as in the case of the measurement.
Drive pulley 27 attached to the output shaft, driven pulley 28 attached to the ball screw 20, and a timing belt 29 wound around these pulleys 27, 28.

Then, the main body 33, the measuring transmission means 25 near the output shaft of the measuring motor 21, and the injection transmission means 30 between the output shaft of the injection motor 26 and the ball screw 20.
Are individually covered with a body cover 34, a front cover 35, and a rear cover 36.

The main body cover 34 covers only the portion of the main body 33, and the metering motor 21 and the injection motor 26 are outside the area. Therefore, the main body cover 34 covers only the necessary space, and can be formed compact with a simple shape. Moreover, the original function of the cover is sufficiently exerted, such as protecting the worker from a dangerous moving part and preventing the lubricating oil from scattering.

The front cover 35 covers the drive pulley 22 and the timing belt 24 attached to the output shaft of the measuring motor 21, and is separate from the main body cover 34. Therefore, the front cover 35 itself can be made small and have a simple shape, and the measuring motor 21 is exposed by covering only the drive pulley 22 and the timing belt 24. The heat radiation of 21 is sufficiently performed by natural heat radiation. Needless to say, the original cover function is exerted.

The same applies to the rear cover 36, that is, the drive pulley 27, the driven pulley 28, and the timing belt 29.
The injection motor 26 is exposed because it only covers the above. Therefore, the injection motor 26 can be made compact and have a simple shape, and can be sufficiently cooled by natural heat dissipation. The same applies when the original cover function is exerted.

The above is an embodiment, and the present invention is not limited to the illustrated embodiment. The transmission means may be a chain and a sprocket, or a gear transmission using a large diameter gear.

[0020]

Since the cover of the injection unit is divided into the main part and is formed individually, each of the covers can be downsized with a simple shape. Therefore, the cover of the injection unit can be provided at low cost. The cover covers unnecessary spaces and is easy to handle without becoming large. Further, the injection unit can be made compact.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of an injection unit.

FIG. 2 is a front view showing a main part of an injection unit.

FIG. 3 is a perspective view showing the entire injection molding machine.

FIG. 4 is a plan view showing a main part of an injection unit (conventional example).

5 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols] 1 injection molding machine 2 mold clamping unit 3 injection unit 4 base 5 tie bar 6 front platen 7 rear platen 8 moving platen 9 toggle link 10 mold clamping motor 11 mold clamping part cover 12 tie rod 13 front plate 14 rear plate 15 Pusher plate 16 Cylinder assembly 17 Screw sleeve 18 Ball nut 19 Screw 20 Ball screw 21 Measuring motor 22 Driving pulley (measuring side) 23 Driven pulley 24 Timing belt (measuring side) 25 Measuring transmission means 26 Injection motor 27 Driving pulley ( Injection side) 28 Driven pulley 29 Timing belt 30 Injection transmission means 31 Extruder base 32 Injection part cover 33 Main body 34 Main body cover 35 Front cover -36 Rear cover

Claims (1)

[Claims] 1. A main body having a front plate, a pusher plate and a rear plate, a metering motor attached to the pusher plate and an injection motor attached to the rear plate, and a screw sleeve is fixed on the front surface of the pusher plate. It is rotatably supported at a position and is connected to the output shaft of the measuring motor by the measuring transmission means, and the rear plate is rotatably supported at a fixed position by an injection ball screw arranged in the front-rear direction. The output shaft of the injection motor and the transmission mechanism for injection are connected, and the main body, the measurement transmission device near the output shaft of the measurement motor, and the transmission device for injection between the output shaft of the injection motor and the ball screw are individually An injection unit of an injection molding machine, which is covered with a cover.