TWI426990B - Active-type feeder by aid of by-pass route - Google Patents

Description

Active bypass auxiliary feeder

The invention relates to an active bypass auxiliary feeding device, in particular to a storage drum connected to a vertical injection molding machine to appropriately fill the plastic, thereby improving the precision of the injection product and ensuring the product quality. .

At present, a vertical injection molding machine is commonly used, which mainly includes a vertically arranged machine, a shooting device, a shooting and lifting mechanism, and a clamping module. The injection device mainly comprises an injection screw and a material tube. The discharge port of the material tube faces downward and is installed on the top surface of the clamping assembly, and the injection screw is inserted into the material tube.

When the plastic is injection molded, the shooting lifting mechanism is pulled by the hydraulic cylinder, so that the nozzle at the front end of the feeding tube abuts against the gate of the mold of the clamping assembly, and the injection screw is driven by the hydraulic motor to make the storage material The barrel enters the plastic in the tube and is kneaded and pushed down. After the injection screw is pulled back by a reaction force for a certain distance, a strong pressure is generated by another group of hydraulic cylinders, and the injection screw is pushed down, so that the plastic in the tube is squeezed, and the plastic in the tube is fired at a high speed. Insert into the mold of the clamping module to shape the product.

Among them, in the process of plastic injection molding, the storage cylinder of the vertical injection molding machine is generally inclined at an oblique angle with the vertical material tube, so that the plastic in the storage cylinder automatically enters the feeding tube by the action of gravity. Inside. However, as shown in Fig. 6, since the storage cylinder a is inclined, during the screw storage process, the plastic in the storage cylinder a does not actually enter the material tube b in an equal amount and stably. A gap c is formed above the intersection of the cartridge a and the tube b. In this way, the plastic in the material tube b is not strong, which will lead to uneven mixing of the plastic during the screw storage, and thus the injection pressure is not uniform, and the precise object cannot be shot. This phenomenon is more pronounced when the plastic particles are polygonal, irregular, or small-diameter screws are injected.

In view of this, in order to improve the above-mentioned shortcomings, the active bypass auxiliary feeding device can make the plastic strong, to generate uniform injection pressure, thereby improving the precision of the injection product and ensuring the product quality, and the creator has accumulated many years of experience. And continuous research and development improvements, the creation of this creation.

The main object of the present invention is to provide an active bypass auxiliary feeding device for allowing plastic to flow into a space by gravity, and then squeezing the plastic in the space into the storage cylinder during the screw storage process. Then, the structure inside the material tube can be made, and the plastic in the material tube can be solidified, so that the mixing of the plastic is uniform and the uniform injection pressure can be generated, thereby improving the precision of the injection product and ensuring the product quality.

A secondary object of the present invention is to provide an active bypass auxiliary feeding device for allowing plastic to be squeezed into a space by gravity, and then allowing plastic in the space to be squeezed to a proper amount during the screw storage process. In the storage cylinder, the structure inside the material pipe can be effectively controlled to control the plastic entering the material pipe to generate uniform injection pressure and avoid damage of the machine parts caused by overfilling.

For the purpose of the above invention, the active bypass auxiliary feeding device of the present invention comprises an outer cylinder, a piston and a driving assembly. Wherein, the top end of the outer cylinder is connected at an angle to the lower side of the oblique storage drum of the vertical injection molding machine, the outer cylinder is connected with the lower side of the storage cylinder, and the outer cylinder is sleeved on the piston so that A space is formed between the top end of the piston and the lower portion of the storage cylinder; and one end of the drive assembly is disposed below the bottom of the piston for pushing the piston in the outer cylinder to move upward.

In implementation, the piston includes an outer sleeve and an inner sleeve, the outer sleeve is sleeved on the inner sleeve, and the top surface of the outer sleeve is closed, and the upper surface of the inner sleeve and the top surface of the outer sleeve are disposed between Elastic parts.

In implementation, the drive assembly includes interconnecting cams, reducers, and motors, and the cams are disposed below the bottom of the piston.

In implementation, the driving component may also include a controller, a pressure cylinder and a state pump. One end of the pressure cylinder is arranged below the bottom of the piston, the pressure cylinder is connected with the state, and the controller is electrically connected with the state. The cylinder is one of a hydraulic cylinder or a pneumatic cylinder.

In implementation, the present invention further includes a detector connected to the driving component and the outer cylinder for detecting the pressure in the space formed between the top end of the piston and the lower portion of the storage cylinder to control the upward movement distance of the pressure cylinder .

In order to facilitate a more in-depth understanding of the present invention, it is described in detail later:

Referring to Figures 1 and 2, which are preferred embodiments of the active bypass assisted feeding device 1 of the present invention, the present invention is coupled to a vertical injection molding machine 9, and the vertical injection is employed. The molding machine 9 is provided with a storage cylinder 92 which is connected at an oblique angle to the upright material pipe 91, and the bottom end of the storage cylinder 92 is connected to the material pipe 91 and communicates with each other. The active bypass auxiliary feeding device 1 includes an outer cylinder 2, a piston 3, and a drive assembly 4.

The outer cylinder 2 is a circular tube penetrating vertically, and the top end of the outer cylinder 2 is connected below the storage cylinder 92 so that the outer cylinder 2 and the storage cylinder 92 are substantially perpendicular, and the outer cylinder 2 and the storage cylinder The lower part of 92 is connected. When implemented, the top end of the outer cylinder 2 can also be connected to the lower side of the storage cylinder 92 at other angles.

The piston 3 includes an outer sleeve 31 and an inner sleeve 32. The top surface of the outer sleeve 31 is closed, the bottom surface of the inner sleeve 32 is closed, and the outer sleeve 31 is sleeved on the inner sleeve 32. A spring is disposed between the upper portion of the sleeve 32 and the top surface of the outer sleeve 31, and the spring is used as the elastic member 33. When implemented, the elastic member 33 may also be an elastic object such as foam. In addition, the outer cylinder 2 is sleeved on the outer sleeve 31 such that a space 34 is formed between the top surface of the outer sleeve 31 and the lower portion of the storage cylinder 92.

The drive assembly 4 includes a cam 41, a speed reducer 42 and a motor 43 which is disposed below the bottom surface of the inner sleeve 32 of the piston 3. The cam 41 is coupled to a shaft 44 for the shaft 44. A gear is provided at one end for engaging with the gear of the speed reducer 42, and the speed reducer 42 is further connected to the motor 43, so that when the motor 43 rotates, the output speed is reduced by the speed reducer 42, and the cam 41 is driven to rotate.

Thereby, as shown in FIG. 3, when the plastic is housed in the hopper 92, the plastic in the hopper 92 flows down to the space between the top surface of the outer sleeve 31 and the lower portion of the hopper 92. 34, while in the screw storage process of the vertical injection molding machine 9, the piston 3 in the outer cylinder 2 is moved upward by the pushing of the cam 41, and the plastic in the space 34 is pressed upward to The insufficient plastic in the cartridge 92 is replenished.

As shown in FIG. 4, when the amount of plastic to be replenished is less than the amount of plastic to be replenished, after the outer sleeve 31 is moved upward by a certain distance, the insufficient plastic can be made up, at this time, due to the outer sleeve 31. Can't continue moving up and will stay in a certain position. By the cushioning action of the elastic member 33, the inner sleeve 32 will continue to be moved upward by the pushing of the cam 41, and after the cam 41 continues to rotate, the inner sleeve 32 is reset, and the entire piston 3 is moved downward to The plastic in the hopper 92 is again allowed to flow down into the space 34 between the top surface of the outer sleeve 31 and the lower portion of the hopper 92.

As a result, since the interval of the cam 41 is continuously pushed, the plastic in the material tube 91 is maintained in a strong state to improve the precision of the injection product and ensure the product quality.

Referring to FIG. 5, the driving assembly 4 can also include a controller 45, a pressure cylinder 46 and a state pump 47. One end of the pressure cylinder 46 is disposed below the bottom of the piston 3, and the pressure cylinder 46 is The Bangpu 47 is connected, the controller 45 is electrically connected to the Bangpu 47, and the cylinder 46 is one of a hydraulic cylinder or a pneumatic cylinder. In addition, a detector 48 is connected to the controller 45 and the outer cylinder 2 respectively to detect the pressure in the space 34 formed between the top end of the piston 3 and the lower portion of the storage cylinder 92. Thereby, the pressure of the detector 48 can be controlled to control the stroke of the cylinder 46 to push upward, and the plastic in the material tube 91 can also be maintained in a strong state to improve the injection quality.

Therefore, the present invention has the following advantages:

1. The invention can effectively supplement the insufficient plastic when the screw is stored, so that the plastic in the material tube can be solidified, the mixing of the plastic can be uniformed, and uniform injection pressure can be generated, thereby improving the precision of the injection product, and Ensure product quality.

2. The invention can effectively control the plastic entering the material tube when the screw is stored, and therefore, not only can the effect of replenishing the plastic be achieved, but also the damage of the mechanical parts caused by the overfilling can be avoided.

In summary, according to the above disclosure, the present invention can achieve the intended purpose of the invention, providing a plastic that can be solidified to produce a uniform injection pressure, thereby improving the precision of the injected product and ensuring product quality. The active bypass auxiliary feeding device is of great value for industrial use, and the invention patent application is filed according to law.

1. . . Active bypass auxiliary feeder

2. . . Outer tube

3. . . piston

31. . . Outer sleeve

32. . . Inner sleeve

33. . . Elastic part

34. . . space

4. . . Drive component

41. . . Cam

42. . . reducer

43. . . motor

44. . . Shaft

45. . . Controller

46. . . Pressure cylinder

47. . . Bangpu

48. . . Detector

9. . . Forming Machine

91. . . Feed tube

92. . . Storage cylinder

a. . . Storage cylinder

b. . . Feed tube

c. . . Void

Figure 1 is a schematic perspective view of a first embodiment of the present invention.

Figure 2 is a combined cross-sectional view of a first embodiment of the present invention incorporated into a molding machine.

3 and 4 are diagrams showing the state of use of the first embodiment of the present invention.

Figure 5 is a schematic cross-sectional view showing another aspect of the drive assembly of the present invention.

Figure 6 is a schematic view showing the state of use of a conventional molding machine.

1. . . Active bypass auxiliary feeder

2. . . Outer tube

3. . . piston

31. . . Outer sleeve

32. . . Inner sleeve

33. . . Elastic part

34. . . space

4. . . Drive component

41. . . Cam

44. . . Shaft

9. . . Forming Machine

91. . . Feed tube

92. . . Storage cylinder

Claims (6)

An active bypass auxiliary feeding device comprises: an outer cylinder whose top end is connected at an angle to an oblique storage drum of a vertical injection molding machine, and the outer cylinder is connected to the lower side of the storage cylinder The outer cylinder is sleeved on a piston such that a space is formed between the top end of the piston and the lower portion of the storage cylinder, and the piston system includes an outer sleeve and an inner sleeve, and the outer sleeve is sleeved On the inner sleeve, the top surface of the outer sleeve is closed, an elastic member is disposed between the upper portion of the inner sleeve and the top surface of the outer sleeve, and a driving assembly is provided at one end of the piston Below the bottom, the piston in the outer cylinder is pushed upwards. The active bypass auxiliary feeding device according to claim 1, wherein the elastic member is a spring. The active bypass auxiliary feeding device according to claim 1, wherein the driving assembly comprises a cam connected to each other, a speed reducer and a motor, and the cam is disposed below the bottom of the piston. The active bypass auxiliary feeding device according to claim 1, wherein the driving component comprises a controller, a pressure cylinder and a state pump, one end of the pressure cylinder is disposed under the bottom of the piston The pressure cylinder is connected to Bangpu, and the controller is electrically connected to Bangpu. The active bypass auxiliary feeding device according to claim 4, wherein the pressure cylinder is one of a hydraulic cylinder or a pneumatic cylinder. The active bypass auxiliary feeding device according to claim 5, further comprising a detector connected between the controller and the outer cylinder for detecting the top of the piston and the bottom of the storage cylinder The pressure in the space formed.