TWM451239U - Needle valve hot runner device having linkage bars with sliding allowance - Google Patents

Description

Needle valve type hot runner device with slip allowance on the connecting rod

The present invention relates to a needle valve type hot runner device, in particular to a needle valve type hot runner device between a connecting rod, a valve needle and a valve piston, respectively, so that the two valve pistons are asynchronously pushed In the case of a connecting rod, the connecting rod can be slightly slipped by the margins without exerting a horizontal displacement force on the valve needle and the valve piston.

According to the continuous improvement of the mechanical properties (such as heat resistance, electrical properties, chemical properties, and optical properties) of plastic materials, and the advantages of mass production and processing, there are many industrial products, such as : Parts such as steam locomotives, electronic components, communication devices, mainframes, etc., are made of plastic materials. This has made plastic molds occupy a large proportion in the mold industry, and has also made injection molding a common process technology. Among them, the hot runner is widely favored by the industry.

Generally speaking, the hot runner device adopts a continuous heating method, so that the thermoplastic material in the hot nozzle and the sizing mold is in a molten state, and after the thermoplastic material is cooled and solidified, the finished product can be opened and removed without generating agglomerates. In order to avoid the need for the manufacturer to recover the aggregate through additional procedures (such as grinding), the convenience of use is greatly improved, and the production cost is lowered. Briefly introduce the existing hot runner device, as shown in Fig. 1, the hot runner device 1 comprises a body 11 which can be assembled onto an injection molding die, wherein the central portion of the seat body 11 can For a hot mouth 13 to be embedded, one end of the hot nozzle 13 is fixed to the seat body In the other end, the other end thereof extends outward toward the bottom side of the base body 11, and a heater 131 is disposed on the outer periphery thereof, and the heater 131 can heat the hot nozzle 13 so that the hot nozzle 13 can maintain a predetermined temperature. Further, the top side of the seat body 11 is provided with a receiving portion 15, and the top end of the receiving portion 15 is provided with a receiving port 151, and the feeding port 151 is in communication with the hot nozzle 13 so that the thermoplastic material can pass through the The inlet port 151 flows into the hot nozzle 13. Thus, by the heating effect of the heater 131, the thermoplastic material can be in a molten state, and can be sequentially flowed into the sizing mold through the feeding portion 15 and the hot nozzle 13 to form a desired appearance of the manufacturer. .

In addition, as shown in FIG. 1 , in order to control the state in which the thermoplastic material continuously flows into or pauses into the sizing die, the top side of the seat body 11 is further provided with a connecting rod 17 through which the connecting rod 17 can pass. The inlet portion 15 is axially displaceable upwardly. Further, a position of the seat body 11 adjacent to the two ends is respectively provided with a valve piston 16 , and one end of the valve piston 16 is received in the seat body 11 and can Influenced by the action of gas injected or extracted from a pneumatic cylinder (not shown), and axially displaced upward and downward in the seat 11, the other end of the valve piston 16 passes through the seat. The body 11 is respectively locked to the two ends of the connecting rod 17 to drive the connecting rod 17 to be displaced. Further, a valve needle 19 is received into the seat body 11 and the hot mouth 13 and one end thereof is fixed to The other end of the connecting rod 17 can pass through the other end of the hot nozzle 13 to be exposed to the outside of the hot nozzle 13 or retracted into the hot nozzle 13, so that when the valve piston 16 is subjected to a pneumatic cylinder When the injected gas is pushed to drive the connecting rod 17 to move upward, the connecting rod 17 simultaneously drives the valve needle 19 to retract into the hot nozzle 13. So that the thermoplastic material can continue to flow into the shaping mold; Si, the pneumatic cylinder when the extracted gas, so that such When the valve piston 16 drives the connecting rod 17 to be displaced downward, the connecting rod 17 simultaneously drives the valve needle 19 to the hot nozzle 13 so that the thermoplastic material cannot flow into the setting die, so that the operator can control the thermoplastic material. Flow status.

However, during the long-term study of the hot runner device, the creator found that there is still a big loss in the existing hot runner device. As shown in Figure 1, the existing hot runner device mostly passes through two gas valves. The piston 16 drives the displacement of the connecting rod 17. Ideally, the valve pistons 16 act synchronously, that is, the connecting rods 17 will remain displaced horizontally upwards or downwards. However, in practice, the pneumatic cylinders are injected. When gas or gas is extracted, it is often impossible to make the displacement rate of the piston 16 of the gas valve different due to external factors (such as the difference in the weight of the valve piston 16 and the diameter of the inlet pipe, etc.). When the displacement amounts of the valve pistons 16 are different, the force applied to the two ends of the connecting rod 17 forces the connecting rod 17 to be inclinedly displaced. Therefore, the connecting rod 17 also acts on the air valves. The piston 16 and the valve needle 19 exert a horizontal displacement force, so that the hot runner device 1 can easily cause the following problems: (1) the friction between the valve piston 16 and the inner wall of the seat body 11 is large. Increase, causing the valve piston 16 to wear easily; (2) the operation of the connecting rod 17 It is easy to be unsatisfactory, thereby causing the time for controlling the outflow or interruption of the flow of the thermoplastic material to be unsatisfactory for a predetermined time; (3) the friction between the valve needle 19 and the inner wall of the hot mouth 13 is greatly increased, resulting in the valve needle 19 being easily worn or generated. Cracks; and (4) When one end of the connecting rod 17 is displaced faster than the other end, the locking portion between the other end and the valve piston 16 is more easily released.

Further, in addition to the foregoing problems, since the hot runner device 1 needs to be high The working environment alternates between warm and low temperature. Therefore, due to the thermal expansion and contraction, the locking between the connecting rod 17 and the valve piston 16 is prone to loosening problems, thereby causing the valve piston 16 and the connecting rod. The connection at both ends of 17 is not sufficiently tight, resulting in a more serious problem of different displacement rates at both ends of the link 17.

In summary, it can be seen that the problem of inconsistent displacement of the two valve pistons will seriously affect the operation quality of the hot runner device. Therefore, how to design a better hot runner device for the above-mentioned missing and simple It is an important issue for related companies to apply to the original injection molding mold without making major changes.

In view of the operation of the existing hot runner device, it is impossible to effectively control the synchronous displacement of the two valve pistons, resulting in the lack of wear of the valve piston and the valve needle. Therefore, the creator has finally worked hard to study and experiment and finally develop. Designed a needle-type hot runner device with a slip margin on the connecting rod, in order to provide a better hot runner device by this creation, so that the operator can be in the existing market. ,To have a role to play.

One of the purposes of this creation is to provide a needle valve hot runner device with a slip margin on the connecting rod, which is applied to an injection molding die, including a body, a hot mouth, a heater, and a connection. a rod, a valve needle and a two-valve piston, wherein the seat body is provided with a receiving space and a two-chamber, and the air chambers can respectively receive the gas injected by the pneumatic cylinder or be extracted by a pneumatic cylinder, the heat One end of the mouth can extend into the seat body and is located in the receiving space, and the other end of the mouth extends outwardly toward the bottom side of the seat body, and is provided with a filling port, and the outer circumference of the hot mouth is sleeved The heater is arranged to maintain the predetermined temperature of the hot nozzle, and the connecting rod is located on the top side of the seat body, and is provided with a circular positioning hole, an oblong circular displacement hole and a snap hole The locking hole is located at a central position of the connecting rod, and the circular positioning hole and the oblong displacement hole are respectively opposite to the air chamber relative to the receiving space, and the valve needle is threaded on the heat One end of the nozzle can be embedded in the locking hole, and the outer circumference of the nozzle is separated from the inner wall surface of the locking hole by a first margin, and the other end of the valve needle can be exposed through the injection opening. The outer end of the air valve is retracted into the hot nozzle, and one end of the gas valve piston is pivotally connected to the connecting rod through a circular positioning hole and an oblong displacement hole respectively. And the other end is respectively accommodated in each corresponding gas chamber, wherein a second margin is provided between the shaft bolt passing through the oblong displacement hole and the inner wall of the oblong displacement hole, and the air chambers are When the gas is injected and the rate at which the valve pistons push the rod upwards is inconsistent, the margins allow the valve needle and the shaft bolt Shifting, so that the valve pistons are only subjected to the upward force of the gas push, so that by the design of the first margin and the second margin, the link can be tilted upwardly, the connection The rod does not exert a horizontal displacement force on the valve piston and the valve needle to avoid excessive friction between the valve piston and the valve needle and the seat body, causing the needle valve hot runner device to be damaged due to excessive wear. .

For the sake of your review, you can make a further understanding and understanding of the purpose, technical features and efficacy of this creation. The examples are shown in the following diagram:

This creation is a needle valve type hot runner with a slip margin on the connecting rod. It is applied to an injection molding die, mainly to solve the problem caused by the difference of the displacement rates of the two valve pistons, so as to maintain the needle valve type hot runner device, without greatly changing the original mold. The quality of the work. In a preferred embodiment, as shown in FIG. 2, the needle valve hot runner device 2 includes a body 21, a hot nozzle 23, a heater 25, a connecting rod 27, a valve needle 28, and The two-valve piston 29 is provided with a receiving space 210 in the central position of the seat body 21, and a gas chamber 212 is disposed in each of the two ends. In this embodiment, the seat body 21 is composed of an upper casing 211. And the lower housing 213 is combined, but in other embodiments of the present invention, the manufacturer can adjust the overall structure of the base 21 according to the product requirements, as long as the seat 21 can be used to carry the needle valve type hot pouring. The component of the track device 2, that is, the seat body 21 described in the present creation, is first and foremost.

Referring to FIG. 2, the seat body 21 is still connected to a two-pneumatic cylinder (not shown), and the pneumatic cylinders can respectively inject gas into the air chambers 212 or by using the gas. The gas chamber 212 is extracted, but in other embodiments, the seat body 21 can be connected only to a pneumatic cylinder, and the pneumatic cylinder can simultaneously inject gas or extract gas into the gas chamber 212, or the same The gas chamber 212 can be connected to two pneumatic cylinders, one of which can inject gas, and the other pneumatic cylinder can extract gas, so that as long as the gas chamber 212 can receive the gas injected by the pneumatic cylinder, or the pneumatic cylinder The gas is extracted, which is the connection between the seat body and the pneumatic cylinder described in the present creation. In addition, the hot nozzle 23 is made of a heat conductive material, and has a channel 230 therein. One end of the hot nozzle 23 can extend into the receiving space 210 of the base body 21 and is connected to a receiving portion 24 . The receiving portion 24 is disposed on the top side of the base body 21, and is provided with a receiving port 241, and the feeding port 241 can communicate with the channel 230 of the hot nozzle 23, and the hot mouth 23 The other end extends outwardly toward the bottom side of the base body 21, and is provided with a filling port 232. Thus, the thermoplastic material can sequentially pass through the inlet port 241, the passage 230 and the injection port 232, and flow into a molding. Mold (not shown). It is hereby stated that the feeding portion 24 of Fig. 2 cannot see the connection relationship between the inlet port 241 and the passage 230 due to the sectional position thereof, but the above-mentioned aspect is a conventional technique, and The focus of this creation is to emphasize the overall technical characteristics advocated by this creation and to be described.

In addition, as shown in FIG. 2, the heater 25 is disposed on the outer periphery of the hot nozzle 23 so as to be able to maintain a predetermined temperature by the heater 25 so as to flow through the hot nozzle 23. The thermoplastic material can be in a molten state, wherein the heater 25 includes a heat conducting sleeve 251 and a heating unit 253. The heat conducting sleeve 251 is a hollow tubular body and is sleeved on the outer periphery of the hot nozzle 23. The heating unit 253 is disposed on the heat conducting sleeve 251, and generates heat after being energized to heat the heat conducting sleeve 251, so that the heat of the heat conducting sleeve 251 can be transferred to the hot nozzle 23, so that the hot nozzle 23 can be maintained. The predetermined temperature set by the manufacturer, so that when the manufacturer uses different thermoplastic materials (such as: Thermoplastic Polyurethane, Acrylonitrile Butadene Styrene, Nylon, Polyvinly Chloride, etc.), the heating temperature of the heater 25 can be directly adjusted, and then The hot nozzle 23 is allowed to continue to heat the thermoplastic material so that the thermoplastic material is in a molten state to facilitate flow into the sizing mold.

Furthermore, please refer to Figures 2 and 3, in which Figure 3 only draws the relevant components in order to avoid the complexity of the drawing. The connecting rod 27 is located on the top side of the seat body 21 and passes through a displacement through hole 243 formed in the receiving portion 24, so that the connecting rod 27 can be vertically reciprocally displaced in the axial direction. Set up a circular positioning hole 271, an oblong displacement hole 273 and a locking hole 275, wherein the circular positioning hole 271 and the oblong displacement hole 273 are respectively adjacent to the positions of the two ends of the connecting rod 27, and respectively opposite to Each of the air chambers 212 is located at a central position of the connecting rod 27, and a locking portion 2751 is disposed at a position adjacent to the receiving space 210 and adjacent to the bottom side of the connecting rod 27, and the locking portion is provided. The 2751 can be an annular body or a combination of a plurality of arcuate bodies extending in the direction of the axis. The valve pin 28 is disposed in the hot nozzle 23, and has a latching portion 281 at one end thereof. The latching portion 281 can be embedded in the locking hole 275, and the bottom surface thereof abuts against the locking portion. The top surface of the 2751 is such that it cannot be detached from the opening of the locking hole 275. The outer circumference of the engaging portion 281 is still separated from the inner wall surface of the locking hole 275 by a first margin 277, and the valve needle 28 The outer peripheral edge of the locking portion 2751 is also spaced apart from the inner wall surface of the locking portion 2751 so that the valve needle 28 can be horizontally displaced to the left and right, and when the connecting rod 27 drives the valve needle 28 to move up and down. At the same time, the other end of the valve needle 28 can be retracted into the hot nozzle 23, so that the thermoplastic material can flow out through the injection port 232 or through the injection port 232 to be exposed outside the hot nozzle 23, so that the thermoplastic material It cannot flow out from the injection port 232 and is stagnated in the hot nozzle 23.

Referring to Figures 2 and 3, one of the valve pistons 29 passes through the circular positioning hole 271 through a shaft pin 291 to be pivotally connected to the connecting rod 27, and the other end thereof is accommodated to In the corresponding air chamber 212, the corresponding shaft pin 291 of the valve piston 29 can rotate in the circular positioning hole 271, and one end of the other valve piston 29 passes through the other shaft pin 291 through the oblong shape. The displacement hole 273 is pivotally connected to the connecting rod 27, and the other end thereof is received into the corresponding air chamber 212. The outer circumference of the other shaft bolt 291 and the oblong displacement hole 273 Between the inner walls, a second margin 279 is provided, so that the position between the other axle pin 291 and the oblong displacement hole 273 can move relative to each other, that is, the other axle pin 291 can be in the oblong hole 273. Slip left and right. To facilitate the description of the actuation relationship between the connecting rod 27 and the valve piston 29, as shown in Figures 2 to 4A, when the gas chambers 212 are filled with gas, such that the valve piston 29 pushes the connecting rod 27 upward. Assuming that the rate of upward displacement of the valve piston 29 on the left side of FIG. 4A is greater than the rate of upward displacement of the right valve piston 29, the link 27 can be displaced upwardly in an inclined manner, at this time, by the second The space of the margin 279, the left shaft bolt 291 will abut the left inner wall of the oblong displacement hole 273, or be adjacent to the left inner wall of the oblong displacement hole 273, at the same time, by the In a space of the margin 277, the engaging portion 281 of the valve needle 28 can be adjacent to or abuts against the right inner wall of the locking hole 275. For the same reason, please refer to FIG. 4B, assuming the left side of FIG. 4B. When the rate at which the gas valve piston 29 is displaced upward is smaller than the rate at which the right valve piston 29 is displaced upward, the left shaft bolt 291 can be slid to the right inner wall adjacent to or against the oblong displacement hole 273. The card portion 281 can be slid to the left inner wall adjacent to or against the card hole 275, thus, when the two ends of the link 27 The shifting speed is different, and the shaft bolt 291 and the engaging portion 281 can slide in the oblong displacement hole 273 or the locking hole 275, so that the connecting rod 27 does not apply horizontal displacement to the valve piston 29 and the valve needle 28. The force, that is, the valve piston 29 is only subjected to a gas-driven axial (upward or downward) force, and the valve needle 28 is only subjected to the axial (upward or downward) action of the connecting rod 27. The force causes the friction between the valve piston 29 and the seat body 21 and between the valve needle 28 and the hot nozzle 23 to not increase suddenly, thereby effectively reducing the probability of excessive wear of the aforementioned components.

In addition, as shown in Figures 2 and 3, the first and second margins 277, 279 have tolerances in addition to the slip of the snap portion 281 and the shaft pin 291 of the valve needle 28. The function can be applied to the needle valve hot runner device 2 when the valve needle 28 or the shaft bolt 291 is produced during the production process, and when the aforementioned components are in the process of operation, thermal expansion and contraction occurs. The first and second margins 277, 279 also ensure that the needle valve hot runner device 2 can continue to operate normally to improve the production quality of the manufacturer and reduce the probability of maintenance.

According to the above description, it is only a preferred embodiment of the present invention, but the scope of the claims claimed by the present invention is not limited thereto, and according to those skilled in the art, according to the technical content disclosed in the present invention, Equivalent changes that are easily thought of should be in the protection of this creation.

2‧‧‧needle valve hot runner device

21‧‧‧ body

210‧‧‧ accommodation space

211‧‧‧Upper casing

212‧‧‧ air chamber

213‧‧‧ Lower case

23‧‧‧Hot mouth

230‧‧‧ channel

232‧‧‧ injection port

24‧‧‧Feeding Department

241‧‧‧Inlet

243‧‧‧Displacement perforation

25‧‧‧heater

251‧‧‧heat sleeve

253‧‧‧heating unit

27‧‧‧ Connecting rod

271‧‧‧round positioning hole

273‧‧‧Ocean displacement hole

275‧‧‧Card hole

2751‧‧‧Card Department

277‧‧‧First Margin

279‧‧‧Second margin

28‧‧‧ valve needle

281‧‧‧Insert Card Department

29‧‧‧Air valve piston

291‧‧‧ shaft bolt

1 is a schematic perspective view of a conventional hot runner device; FIG. 2 is a schematic cross-sectional view of the needle valve type hot runner device of the present invention; and FIG. 3 is a partial cross-sectional view of the connecting rod and the valve needle of the present invention; The 4A diagram is a schematic diagram of the first actuation of the link of the present creation; and the 4th diagram is a schematic diagram of the second actuation of the linkage of the present creation.

2‧‧‧needle valve hot runner device

21‧‧‧ body

210‧‧‧ accommodation space

211‧‧‧Upper casing

212‧‧‧ air chamber

213‧‧‧ Lower case

23‧‧‧Hot mouth

230‧‧‧ channel

232‧‧‧ injection port

24‧‧‧Feeding Department

241‧‧‧Inlet

243‧‧‧Displacement perforation

25‧‧‧heater

251‧‧‧heat sleeve

253‧‧‧heating unit

27‧‧‧ Connecting rod

273‧‧‧Ocean displacement hole

275‧‧‧Card hole

28‧‧‧ valve needle

29‧‧‧Air valve piston

291‧‧‧ shaft bolt

Claims (9)

A needle valve type hot runner device with a slip margin on a connecting rod is applied to an injection molding die, comprising: a body having a receiving space and a two-chamber, wherein the air chambers can respectively Receiving the gas injected by the pneumatic cylinder or extracting the gas by the pneumatic cylinder; one end of the hot nozzle extends into the seat body and is located in the receiving space, and the other end thereof extends outward toward the bottom side of the seat body. And a filling port; a heater is disposed on the outer periphery of the hot nozzle and maintains the hot nozzle at a predetermined temperature; a connecting rod is located on the top side of the seat body, and has a circular shape thereon a positioning hole, an oblong displacement hole and a snap hole, wherein the locking hole is located at a central position of the connecting rod, and the circular positioning hole is opposite to one of the air chambers with respect to the receiving space, the oblong shape The displacement hole is opposite to the other air chamber; a valve needle is disposed in the hot nozzle, and one end of the valve is provided with a snap-in portion, and the embedded portion is embedded in the locking hole, and the outer periphery thereof is a first margin is separated from an inner wall surface of the card hole, and the other end of the valve needle can pass through the injection port Outside the hot nozzle, or retracted into the hot nozzle; and the two-valve piston, one end of which is pivotally connected to the connecting rod through a circular positioning hole and an oblong displacement hole respectively, and The other end is respectively accommodated in each corresponding gas chamber, wherein a second margin is formed between the shaft bolt passing through the oblong displacement hole and the inner wall of the oblong displacement hole; the gas chamber is injected The second margin can allow the shaft to be bolted to the long circle in a state in which the gas or the extracted gas causes the valve piston to axially displace the link and the rate of axial displacement of the valve pistons is inconsistent. Slip in the shape displacement hole, the same The first margin can allow the card portion to slip in the carding hole, so that the valve pistons are only subjected to the axial displacement force driven by the gas. The needle valve type hot runner device according to claim 1, wherein the engaging hole extends to the axial center of the connecting rod to extend to a central portion thereof, and a bottom portion of the engaging portion is abutted thereto. The top surface of the carding department. The needle valve type hot runner device of claim 2, wherein the outer circumference of the valve needle is spaced apart from the inner wall of the carding portion. The needle valve type hot runner device of claim 3, wherein the heater comprises a heat conducting sleeve and a heating unit, the heat conducting sleeve is a hollow tube body, and is sleeved on the outer circumference of the hot nozzle. The heating unit is wound around the heat conducting sleeve and heats the heat conducting sleeve. The needle valve type hot runner device according to claim 4, further comprising a feeding portion disposed on a top side of the seat body and provided with an inlet port. The needle valve type hot runner device of claim 5, wherein the hot nozzle is provided with a passage, and the two ends of the passage respectively communicate with the inlet port and the injection port. The needle valve type hot runner device of claim 6, wherein the carding portion is an annular body. The needle valve type hot runner device of claim 6, wherein the carding portion is composed of a plurality of arcs. The needle valve type hot runner device of claim 7 or 8, wherein the seat system is formed by combining an upper casing and a lower casing.