JP3039519U - Integrated material injection system for plastic material injection molding machine - Google Patents

Abstract

[PROBLEMS] To provide a material injection system integration device for a plastic material injection molding machine capable of quickly sucking air inside a mold to improve the quality of a molded product and reduce the cost. SOLUTION: The die 4 has a material stop pin, and stops the runner on the die 4 after completing the injection of the material to prevent the foamed material in the die 4 from overflowing. In the mold 4, there is one vent, which is connected to the vacuum suction pipe and sucks out the air in the mold cavity when the material is injected to cause the foamed material to flow and to generate bubbles. avoid. The material injection port 52 of the material injection base 5 has one material stopping element to stop the flow of the raw material and at the same time prevent the phenomenon of leakage when the raw material arbitrarily flows. The machine base 2 is provided with a front base hydraulic cylinder 6 and a rear base hydraulic cylinder 7.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a material injection system integration device for a plastic material injection molding machine.

[0002]

[Prior art]

 As shown in FIG. 1, a material injection system of a conventional plastic material injection molding machine includes a machine base 11, a material injection base 12, a mold set 13, a front base hydraulic cylinder 14 and a rear base hydraulic cylinder 15. This system melts a plastic raw material in a liquid state and pushes a push-push 17 of a machine base 11 through a piston rod 141 of the front base hydraulic cylinder 14 to push a material injection base 12 on the machine base 11 into an X-axis. Then, the material injection port 121 corresponds to the runner port 131 of the mold assembly 13 and the plastic material is injected into the mold cavity 132 of the mold assembly 13 for molding. After injecting the material, the material ejection port 121 is stopped in the vertical direction (that is, the Z-axis direction or the vertical direction) with a single material stop rod (not shown) to stop the injection of the raw material. Next, the material injection base 12 is pushed and returned to the original position through the extension piston rod 151 of the rear base hydraulic cylinder 15 to complete one material injection operation.

[0003]

[Problems to be solved by the device]

 However, when the operation was continued for a long period of time, the following defects were found, and the produced products are defective. (1) Poor quality When the material is injected, the raw material is quickly injected into the mold cavity, whereby the air in the mold cavity is pressed by the raw material and the air escape hole 133 is removed from the mold set 13 to the outside. Escape to. However, when the raw material was injected into the mold cavity, it immediately foamed and expanded, and the air originally existing in the mold cavity could not escape completely from the air escape hole, so Remain. For this reason, the remaining air is contained inside the molded product or forms bubbles on the surface of the molded product. As a result, it is difficult to control the quality of the product, so the number of defective products increases and the cost burden increases. (2) Low production efficiency The hole diameter of the air escape hole cannot be increased. Therefore, the speed at which the air in the die hole escapes from the air escape hole to the outside is always limited. It is difficult to improve the production efficiency because the material ejection speed is always affected by the air escape speed and is limited. (3) Overflow of raw material When the foaming speed of the plastic raw material is relatively high, its volume also expands rapidly, but it cannot flow freely due to the already defined shape of the mold cavity. However, since the runway into which the material has been injected is in communication with the atmosphere, the stopping pressure applied to the foaming raw material at this part is atmospheric pressure. Overflow out of the mold. As a result, the pressure in the mold cavity changes and it is relatively difficult to control the quality of the molded product. (4) The weight of the molded product is unstable. It is not possible to perform precision injection molding work because part of the raw material overflows from the runner. (5) The material injection port easily leaks Since the material injection port is stopped with a single material stop rod at the middle part, no raw material enters the material injection port during the stopping operation. Since there is still a large amount, after stopping this, there is always liquid material at the open end of the material injection port. In addition to contacting the outside air, the remaining raw materials may chemically react with other components contained in the air, or thereby cause oxidation or lower the temperature. It cools and solidifies. Moreover, the joining of the material injection port and the mold set cannot reach one tightly coupled state. (6) The precision gradually decreases Since the front base hydraulic cylinder is provided below the material injection port, the extended piston rod is always installed on the machine base and is the reaction of the impact due to the push thrust. The material injection base is pulled and moved forward (in the X-axis direction) to achieve the purpose of material injection. However, since the material injection base is provided directly on the slide rod 18 on the machine base, the vibration caused by this impact always affects the blending degree of the material injection base with the slide rod, resulting in a gap. As the material injection base moves, its deviation continues to increase, so the precision also gradually decreases, which greatly affects the quality. (7) Since the localization accuracy is too long, it easily interferes with each other. The material injection bases move laterally (Y-axis direction) on the machine base, so connect them one by one to the runner position of the mold. The material injection base is positioned and the movement of the material injection base is stopped. Separately, the front base hydraulic cylinder pushes the material injection base to move it forward to inject the material. For this purpose, be sure to install a long graduation scale (not shown) on the machine base. The scale is blended with a sensor controller (not shown) to stop the material injection base exactly in front of the runner of the mold, so this scale is always one connected character type sensor controller. Is used for monitoring. However, when the machine is stopped due to a power failure or a sudden situation, the connected character type scale scale defines the scale at that time as the origin, and disturbs the material injection operation of the material injection base.

Therefore, the object of the present invention is to remedy the above-mentioned drawbacks, to quickly evacuate the air inside the mold cavity of the mold, avoid the air being wrapped in the molded product, and improve the quality of the product. It is therefore to provide a material injection system integration device for a plastic material injection molding machine that can reduce costs. Another object of the present invention is to further improve the order of material injection, to avoid the overflow of raw material, at the same time prevent any flow, avoid the contact with the outside, and prevent the movement of material injection base. An object of the present invention is to provide a material injection system integration device of a plastic material injection molding machine capable of ensuring that the gate of the mold is coaxially joined in correspondence with the material injection port.

[0005]

[Means for Solving the Problems]

 The material injection system integrated device of the plastic material injection molding machine of the present invention is a machine stand, a mold provided on the machine stand, and a material injection machine which is installed on the machine stand and can move in the X-axis and Y-axis directions. A device including a base, in which the mold has one material stop pin, and after the material injection is completed, the runner on the mold is stopped and the foam material inside the mold is removed. Prevent overflow. There is one vent in the mold, and when the material is injected by connecting with the vacuum suction pipe, the air in the mold cavity is sucked to flow the foam material, and bubbles are generated. Avoid The material injection port of the material injection base has one material stopping element to stop the flow of the raw material and at the same time prevent the phenomenon of leakage of the raw material when it arbitrarily flows. The machine base is provided with a front base hydraulic cylinder and a rear base hydraulic cylinder so that the material injection base receives an impact from the front base and the rear base to eliminate the influence of the accuracy in which the material injection port accurately faces the runner gate. A guide device is provided between the material injection base and the machine base to prevent the deviation phenomenon from occurring when the material injection port of the material injection base accurately faces the runner gate on the mold when the material is injected. By doing so, the injection-molded product with the highest quality is manufactured.

[0006]

[Embodiment of the invention]

 There is a moving base that can move laterally along the Y-axis slide rail that is installed on the top surface of the machine base, and there is a front base pushing protrusion between the moving base and the mold. The mold has an upper mold and a lower mold, and one mold hole, one runner and a ventilation passage are formed between the upper mold and the lower mold, and one end of the runner and the ventilation passage is a metal mold. Penetrate outside the mold to form one runner vent and one vent.

The material injection base is provided on the moving base and advances or retracts along the X-axis slide rail on the moving base. One material injection port is provided at the front end facing the runner port. The feature is that the upper die of the die has a through hole penetrating the runner and the top surface, and the vent hole and the vacuum suction duct are connected to each other.

The mold has one base body on the upper mold, one cut face is provided facing the lower end of the side face of the runner mouth of the base body, and the top face of the cut face is provided. Has a shaft hole that penetrates the top surface of the base body, and the shaft and the through hole of the upper mold penetrate in the axial direction, and the rod part is interlocked with the drive element provided on the top surface of one base body. Then, move vertically in the shaft hole. Further, at the bottom end of the rod, one connecting element and one material stop pin contact each other, and the material stop pin can be moved in the through hole to open and close the runner.

A coaxial material stop element is provided in the material outlet. At its front end there is a bevel that stops and closes the material injection port, and at its rear end it extends out to the rear of the material injection port and comes into contact with one drive element and the material stop Move the element in the material injection port. Install the front base hydraulic cylinder at a position close to the bottom surface of the material injection port of the material injection base, and the piston rod of the front base hydraulic cylinder extends to push the front base pushing thrust to generate a reaction force. , Advance the material injection base and bring the material injection port and the mold runner port into contact with each other.

The rear base hydraulic cylinder is provided at the front end facing the mold of the moving base, and the piston rod of the rear base hydraulic cylinder extends to push the material injection base and retract the material injection base. Separate the material injection port and the mold runner port. The material injection system integration device of the plastic material injection molding machine according to the present invention is characterized by comprising the above-mentioned members.

[0011]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. 2 and 3 show a material injection system integration device of a plastic material injection molding machine according to an embodiment of the present invention. It includes a machine base 2, a moving base 3, a die 4, a material injection base 5, a front base hydraulic cylinder 6, a rear base hydraulic cylinder 7 and a guide device 8.

A movable base 3 is installed on the top surface of the machine base 2 and can move laterally along the Y-axis slide rail 21, and a front base pushing protrusion between the movable base 3 and the mold 4. There is. As shown in FIG. 4, the mold 4 has an upper mold 41 and a lower mold 42, and a mold hole 43, a runner 44, and an air passage 45 are formed between the upper mold 41 and the lower mold 42. Moreover, one end of the runner channel 44 and one end of the ventilation channel 45 penetrate the outside of the mold 4 to form a runner port 441 and a ventilation port 451. In addition, the ventilation port 451 and the vacuum suction pipe line 46 are connected to each other.

As shown in FIG. 5, the upper die 41 has one runner 44 and a through hole 411 on the top surface, and a base body 47 is provided on the upper die 41. The base body 47 has one cut 471 facing the lower end of the side surface of the runner gate 441. There is a shaft hole 472 penetrating the top surface of the base body 47 on the top surface of the cut portion 471, and the shaft hole 472 and the through hole of the upper die 41 penetrate axially to form the top of one base body 47. The driving element 473 provided on the surface interlocks the rod 474 to move vertically in the shaft hole 472. In addition, one connecting element 475 and one material stop pin 476 contact each other at the bottom end of the rod 474, and the material stop pin 476 can move in the through hole 411 to open and close the runner 44. . In the embodiment of the present invention, the driving element 473 is a pneumatic cylinder.

The material base 5 is provided on the moving base 3, and the slide base 51 on the bottom surface thereof is advanced or retracted along the X-axis slide rail 31 on the moving base 3. At the front end, a material injection port 52 is provided facing the runner port 441 of the mold 2. As shown in FIG. 6, in the material injection port 52, there is one coaxial material stopping element 53, and at the front end thereof, there is a slope 531 for stopping the material injection port 52 and closing it, and thereafter. The ends can extend out to the rear of the material outlet 52 and come into contact with one drive element 54 to move the material stop element 53 in the material outlet 52.

As shown in FIG. 7, the front base hydraulic cylinder 6 is installed at a position close to the bottom surface of the material injection port 52 of the material injection base 5, and the piston rod 61 of the front base hydraulic cylinder 6 extends so that the front base hydraulic cylinder 6 extends. The push rod 22 is pushed to generate a reaction force, and the material injection base 5 is moved forward along the X-axis slide rail 31 on the moving base 3 so that the material injection port 52 and the runner port 441 of the mold 4 are brought into contact with each other. Contact.

As shown in FIG. 8, the rear base hydraulic cylinder 7 is provided at the front end of the moving base 3 which faces the mold 4, and the piston rod 71 of the rear base hydraulic cylinder 7 extends so that the material injection base 5 And push the material injection base 5 back along the X-axis slide rail 31 on the moving base 3 to separate the material injection port 52 and the runner 441 of the mold 4.

As shown in FIGS. 9 and 10, the guide device 8 is provided on the moving base 3. There is one elongated abutting portion 81 facing the front end surface of the mold 4 of the moving base 3, and the abutting portion 81 is parallel to both end surfaces of the Y-shaped slide rail 21 of the machine base 2, respectively. There is one inclined surface 82, and one parallel sensing shaft 83 is provided below the front side of the abutting portion 81. One end of the sensing shaft 83 is connected to the magnetic-sensitive linear displacement sensor 84, and there are as many sensitive groups 85 as there are molds 4 on the machine base 2. Each sensitive group 85 has one sensitive group 85. The swing arm 851 is pivotally connected. In addition, the swing arm 851 can swing up and down in response to the pulling force of one spring 852, the pushing of one push rod 853, and the localization of the two limit convex points 854 and 855. The push rod 853 generates a movement amount by the contact between the guide wheel 856 at the front end and the abutting portion 81, and the swing arm 851 is swung by the movement amount so that the swing arm 851 moves the sensing shaft 83 with the one magnet plate 857. Hang up.

With the above-described structure, the operation sequence of the present invention is as follows: (1) The moving base 3 is moved by the movement of the elongated abutting portion 81 and the magnetic sensitivity of the magnetically sensitive linear displacement sensor 84. Observe the exact position when moving on the axis slide rail 21. (2) When the moving base 3 has moved to the fixed position, the front base hydraulic cylinder 6 extends the piston rod 61 in the direction of the X axis and pushes the front base push / push 22 to move the material injection base 5. The material injection port 52 and the runner port 441 of the mold 4 are brought into contact with each other by advancing along the X-axis slide rail 31 on the base 3. (3) After the material injection port 52 and the mold 4 are in contact with each other, the mold 4 moves the air bleeding machine (not shown in the figure). The air in the mold cavity 43 is sucked out through the vacuum suction pipe line 46 and the ventilation port 451. (4) At the same time as sucking out the air in the mold cavity 43, the upper driving element 473 on the mold 4 drives the rod 474 to move upward, and the connecting element 475 interlocks with the material stop pin 476. It moves upward to make the flow of the runner 44 normal. (5) At the same time, the material stopping element 53 and the driving element 54 in the material injection port 52 are interlocked with each other, and the slope 531 at the front end thereof is separated from the material injection port 52 to be in the open state, and the material injection is performed. Start. (6) After injecting a predetermined amount of raw material, the driving element 54 on the upper side of the mold 4 moves downward by interlocking with the rod 474, and the connecting element 475 interlocks with the material stop pin 476 and moves downward. To close the runner 44. In addition, the drive element 54 moves the material stopping element 53 in an interlocking manner, and the slope 531 at the front end thereof abuts the material injection port 52 to bring it into a closed state to stop the material injection. (7) After stopping the material injection, the air bleeding machine stops the air suction. (8) At the same time, the rear base hydraulic cylinder 7 extends the piston rod 71 and pushes the material ejection base 5 to retract the material injection base 5 along the X-axis slide rail 31 on the moving base 3. The material injection port 52 and the runner port 441 of the mold 4 are separated. (9) After the material injection base 5 returns to the original position, the guide device 8 drives the moving base 3 to move to the next one die 4 on the Y-axis slide rail 21. The above operation is repeated in parallel.

[0019]

[Effect of the invention]

 As described above with reference to the embodiments, the integrated device of the material ejection system of the plastic material injection molding machine of the present invention has the following advantages. (1) High accuracy Since the part of the front base hydraulic cylinder that receives the impact of the piston rod is not on the machine base, the vibration caused by the impact is greatly reduced, and the vibration of the moving base and the Y-axis slide rail is caused by the vibration. It is possible to avoid affecting the compounding accuracy. (2) High quality When the material is injected, the gas in the mold cavity is sucked and is in a low pressure state, so there is a suction force for sucking the raw material, which accelerates the feeding of the raw material and also the air. Since there is no bubbles, no bubbles are generated on the surface and inside of the raw material after foam molding, so quality control is extremely easy. Moreover, since one material stop pin is provided at the runner position of the mold, the runner can be blocked after the material injection is completed. As a result, the pressure in the mold cavity is kept constant, the volume in the mold cavity is also kept constant, and the quality of foam expansion of the raw material and the stability of weight can be easily controlled. (3) Raw material does not overflow A coaxial material stopping element is provided in the material injection port. In addition, since the opening position of the material injection port can be blocked by the interlocking of one driving element, there is no leakage of raw materials, and the problem that conventional materials easily leak can be solved. (4) Good localization accuracy Since each magnetic-sensitive linear displacement sensor is installed on the machine base at a predetermined interval, the sensor is extended to the required distance according to the work needs. be able to. As a result, the sensor measures the position of the elongated impact part without being limited by the maximum reading number. For this reason, the guide device of the present invention can be applied to a range of an arbitrary distance, which enhances the practicality. In addition, since each sensor measures the distance between the elongated impact parts near the movable base by the sensitivity of the magnet plate, each sensor can be set as one reference point. This allows the sensor to immediately measure the distance of the corresponding elongated impact part after energization in the event of a power failure during work. In addition, since each one sensor is in a predetermined position, it is not necessary to perform the procedure of zeroing again after the power is turned on, which is more convenient for the work.

The above description of the embodiments is merely an example of using the present invention, and does not limit the scope of the claims of the present invention. Then, any change in the numerical value or replacement of the element having the same effect is also within the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a side view of a material injection system of a conventional plastic material injection molding machine.

FIG. 2 is a perspective view of a material injection base, a front hydraulic cylinder, and a material injection system of a guide device according to an embodiment of the present invention.

FIG. 3 is a side view of a material injection system according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a vacuum suction structure of a mold according to an embodiment of the present invention.

FIG. 5 is a sectional view of a material stopping structure for a mold according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view of the material blocking structure of the material injection port according to the embodiment of the present invention.

FIG. 7 is a view showing the operation of the front base of the embodiment of the present invention.

FIG. 8 is a view showing the operation of the rear base according to the embodiment of the present invention.

FIG. 9 is a plan view of a moving base localization structure according to an embodiment of the present invention.

FIG. 10 is a side view of a moving base localization structure according to an embodiment of the present invention.

[Explanation of symbols]

 2 Machine stand 21 Y-axis slide rail 22 Front base push / push stand 3 Moving base 31 X-axis slide rail 4 Mold 41 Upper mold 411 Through hole 42 Lower mold 43 Mold hole 44 Water passage 441 Water passage 451 Air passage 451 Vent 46 Vacuum suction pipe 47 Base body 471 Cut hole 472 Shaft hole 473 Drive element 474 Rod 475 Connecting element 476 Material stop pin 5 Material injection base 51 Slide base 52 Material injection port 53 Material stop element 531 Slope 54 Drive element 6 Front base Hydraulic cylinder 61 Piston Rod 7 Rear base hydraulic cylinder 71 Piston rod 8 Guide device 81 Abutting part 82 Slope 83 Sensing axis 84 Magnetically sensitive linear displacement sensor 85 Sensitive set 851 Swing arm 852 Spring 853 Push rod 854 Limit convex point 855 Limit convex point 856 Guide wheel 857 Magnet plate

Claims (2)

[Utility model registration claims] 1. A machine base, a moving base, a mold, a material injection base, a front base hydraulic cylinder and a rear base hydraulic cylinder, wherein the machine base is along a Y-axis slide rail erected on the top surface of the machine base. There is a movable base that can be moved in the lateral direction, and a front base pushing protrusion is provided between the movable base and the mold, and the mold is composed of an upper mold and a lower mold. Form holes, runners, and vents are formed between the molds, and one end of the runners and vents penetrates the outside of the mold to form one runner and one vent. The material injection base is installed on the moving base and moves forward or backward along the X-axis slide rail on the moving base. At the front end of the material injection base, one material injection port is provided facing the runner gate. And, the upper mold of the mold penetrated one runner and the top surface. A through hole is provided, and the vent hole and the vacuum suction conduit are connected to each other, the mold has a base body on an upper mold, and the base body is located at a lower end position of a side surface of the runner mouth of the base body. One cut is provided facing the surface, the top surface of the cut has a shaft hole penetrating the top surface of the base body, the shaft hole and the through hole of the upper mold penetrate axially, A driving element provided on the top surface of one base body interlocks the rod to vertically move in the axial hole, and the bottom end of the rod has one connecting element and one material retaining pin. Contacting each other, the material stop pin can be moved in the through hole to open and close the runner, and one coaxial material stop element is provided in the material injection port, There is a slope at the front end that closes the material injection port and closes it, and the rear end of the slope extends outside the rear side of the material injection port. And contacting each other with one driving element, moving the material stop element in the material injection port, the front base hydraulic cylinder is installed at a position close to the bottom surface of the material injection port of the material injection base, The piston rod of the front base hydraulic cylinder extends and pushes the front base pushing thrust to generate a reaction force, which advances the material injection base to bring the material injection port and the mold runner gate into contact with each other. The hydraulic cylinder is provided at the front end facing the mold of the moving base, and the piston rod of the rear base hydraulic cylinder extends to push the material injection base and retract the material injection base to move the material injection port and the metal mold. A material injection system integration device for a plastic material injection molding machine, characterized in that the runner gate of the mold is separated and is composed of the above-mentioned members. 2. The moving base is provided with one guide device, and one front end face having a long diameter is installed so as to face the front end face of the mold of the moving base. Each of the two end faces has one slope, and the lower two front sides of the elongated abutting part have one parallel sensing shaft, and one end of the sensing shaft has one magnetic sensitive linear displacement sensor. The same number of sensitive sets as that of the molds are provided on the machine base, and one swing arm is pivotally connected to the sensitive set, and the swing arm includes one spring. The pulling force of one push rod and the push of one push rod and the localization of the two limiting convex points can make an upward and downward swing motion, and the push rod has a guide ring at the front end and an elongated shape. It moves by the contact of the abutting part, and the swing arm locks the sensing axis with one magnet plate, Material injection system integration device plastic material injection molding machine according to claim 1, characterized in that it is formed to include a formation.