TWI620643B - Open hot runner gate construction - Google Patents

Abstract

The present invention is an open hot runner gate structure comprising a set of bodies disposed in the cavity, a guide pin housed in the cavity of the body, and a set of guides placed on the guide pin a cylinder, and a locking member screwed onto the body, wherein the body is axially provided with a through hole, and the other end of the shaft hole communicates with a receiving groove, and a thread is formed on the inner wall of the other end of the receiving groove for The locking member is screwed together, and the guiding needle and the guiding cylinder are sequentially placed between the receiving groove of the body and the locking member, and the needle needle cone segment of the guiding needle and the guiding cylinder are The outlet formed between the upper ends of the space zone is in an open state in a normally unclosed state; when the sleeve portion of the guide cylinder is nested in the receiving portion of the lock member, only the outer portion of the guide tube is placed outside the guide portion. The diameter is in direct contact with the inner wall surface at the lower half of the receiving portion of the locking member, so that the outer diameter of the outer end of the guiding cylinder away from the seat and the upper half of the receiving portion of the locking member Forming an appropriate distance between the inner wall surfaces to reduce the contact area and thermal conductivity between the guide cylinder and the lock member, thereby making the outlet of the guide tube Maintained at above a certain temperature by heating.

Description

Open hot runner gate construction

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a hot runner; and more particularly to an open hot runner gate structure that utilizes the thermal conductivity of the smallest contact surface between the guide cylinder and the closure member, particularly the melted rubber compound. It is covered in the guide cylinder without directly contacting the molten rubber with the inner surface of the cooled mold, and does not make the outer surface of the rubber form a cooling film to ensure the outlet of the guide cylinder. Can maintain above a certain heating temperature.

According to the conventional hot runner structure, please refer to the approved invention patent certificate No. I318923, which comprises: a first runner body having a first passage penetrating along a central axis; and a second runner body detachably Connecting to the first runner body and having a second passage penetrating through the central axis and communicating with the first passage, and the second runner body has a protruding ring for the hot runner When assembled in a mold set, it is locked between the upper and lower molds; a topping is disposed in the second passage of the second runner body, and is locked at the bottom of the second runner body, and one end a portion extending through the second runner body; a heating unit disposed on the outer side of the first runner body and the second runner body to provide heating; and an outer cover unit Heating the outer peripheral side of the unit.

Although the above-mentioned creations can achieve the original purpose of creation, they are highly praised by the industry and the general operators, but the industry continues to innovate in research and development and technology. Breakthrough, so that the applicants work harder to study and improve, so that they are perfect and practical; plus, the creators have responded with numerous updates to the experimental tests and the actual use of the consumers, and found that The problem still needs to be further improved: due to intermittent discontinuous injection, the head of the head of the pouring head to the inner wall surface of the mold will be covered with a hardened rubber due to the cooling of the discharge, which is heated by the heating unit. The curing compound which is adjacent to the head of the topping head can be melted (ie, near the outer surface of the head), so that the molten rubber is normally discharged after being pressed, but The surface of the cooling compound adjacent to the inner wall surface of the cooled mold will only be partially melted by the heating of the heating unit, and even a film of cooling hardening will remain on the outer surface of the rubber material, so that it is already located in the head. The partially melted compound on the outer peripheral side and the other portion of the cooled and hardened film are normally ejected and discharged through high-pressure impact. At this time, the cooled and hardened film will follow the molten melt flow. And the injection into the cavity of the mold from the pouring point, and the cooling and hardening film will flow with the flow of the molten compound, and the film will be distributed on the outer surface of the finished product near the pouring point, Therefore, an irregular flow mark S (as shown in Fig. 1) is formed on the outer surface of the pouring point of the finished product B, so that it is a big trouble to be mistaken for the defective product.

Therefore, how to develop a melt-melting compound that is coated by the guide cylinder and that does not come into contact with the cooled mold surface before being ejected, and between the guide cylinder and the lock member The direct contact area is kept to a minimum to ensure that the temperature at the outlet end of the runner can be maintained above a certain heating temperature, so that the rubber compound at that location is often kept in a molten state to effectively reduce the outer surface of the rubber compound. The flow marks formed by the stretching of the cooling and hardening film along with the flow of the molten rubber are distributed on the surface of the finished product, thereby greatly improving the yield after the injection.

The open hot runner gate structure of the present invention comprises a plurality of bodies disposed in the cavity, a guide pin housed in the cavity of the body, a set of guide tubes disposed on the guide pins, and a locking member screwed to the body, wherein the body is axially provided with a through hole, and the other end of the shaft hole communicates with a receiving groove, and the inner wall of the other end of the receiving groove is formed with a thread for the locking member For screwing, the guide needle and the guide cylinder can be sequentially placed between the pocket of the body and the lock member, and the end of the needle rod end of the guide needle and the end of the space region of the guide cylinder Forming an unclosed open state; when the sleeve of the guide cylinder fits within the shaft hole of the lock member, only the outer diameter of the guide cylinder near the seat portion is locally and the lock member Forming a direct contact between the inner wall surfaces at the lower half of the shaft hole, so that an outer diameter of the other end of the guide cylinder away from the seat portion and an inner wall surface at the upper half of the shaft hole of the lock member form a gap at an appropriate distance to reduce The contact area between the guide cylinder and the lock member and the thermal conductivity, and thus the outlet of the guide cylinder is maintained at a certain heating temperature or higher.

1‧‧‧Mold

10‧‧‧ cavity

11‧‧‧Forming cavity

2‧‧‧ Ontology

20‧‧‧ Pedestal

201‧‧‧ slotting

21‧‧‧ shaft section

22‧‧‧ Groove

23‧‧‧Axis hole

24‧‧‧ 容容

241‧‧‧ thread

242‧‧‧ Ring groove

3‧‧‧Guide needle

30‧‧‧ needle seat

31‧‧‧Guide hole

32‧‧‧ Needle bar

321‧‧‧ needle cone

322‧‧‧ Guide slot

4‧‧‧Guide tube

40‧‧‧s

41‧‧‧ Sockets

42‧‧‧Extension

45‧‧‧Space Zone

5‧‧‧Locks

50‧‧‧Threading Department

51‧‧‧Turning Department

52‧‧‧Encircling

53‧‧‧ 容部

531‧‧‧Kecon

532‧‧‧ spaced holes

6‧‧‧ heating element

61‧‧‧Wire

7‧‧‧Material

9‧‧‧ finished product

A‧‧‧Export

Fig. 1 is a view showing the appearance of a finished product manufactured by a conventional technique.

Figure 2 is a schematic exploded view of the creation.

Fig. 3 is a perspective partial exploded view of Fig. 2;

Figure 4 is a partial enlarged view of the combined section of the creation.

Figure 5 is a cross-sectional view of the second drawing in the application.

Fig. 6 is a combined sectional view when the fifth figure is actuated.

Fig. 7 is a view showing the appearance of the finished product produced in Fig. 2.

Please refer to Figures 2 to 7, the creation provides an open heat A sprue gate structure comprising a plurality of bodies 2 disposed in the cavity 10 of the mold 1, a guide pin 3 housed in the cavity 24 of the body 2, and a set of guides placed on the guide pin 3. a barrel 4 and a locking member 5 screwed onto the body 2, wherein the body 2 includes at least a base 20, a shaft portion 21 perpendicular to the base 20, and a base 20 and a shaft An annular groove 22 between the portions 21, and a suitable slot 201 is provided at a suitable portion of the base 20, the slot 201 being connectable to the annular groove 22 and the outer side of the base 20 so that the heating element 6 can The sleeve is placed outside the shaft portion 21, and the bottom end edge of the heating element 6 can be placed in the annular groove 22, and the electric wire 61 of the heating element 6 can be connected to the outside from the slit 201 (Fig. 5) Further, the axial direction of the body 2 is provided with a through hole 23, and the other end of the shaft hole 23 is connected with a receiving groove 24, and a thread 241 and a ring groove 242 are formed on the inner wall of the other end of the receiving groove 24 for locking. The fitting 5 is screwed to the thread 241, and the needle holder 30 of the guide needle 3 and the seat portion 40 of the guide barrel 4 are sequentially sandwiched between the groove 24 of the body 2 and the bottom surface of the lock member 5, and The needle rod 32 needle cone 321 section of the guide needle 3 and the guide barrel 4 The outlet A formed between the upper ends of the space region 45 is in an unclosed open state (as shown in FIG. 4); the guide needle 3 includes a needle holder 30 that can be received in the cavity 24, and a through needle a guide hole 31 of the seat 30, and a needle bar 32 inserted into the space region 45 of the guide cylinder 4, wherein the needle bar 32 is formed with a needle cone 321 at the end thereof, and a guide groove is formed on the side of the needle bar 32. 322, and the guide groove 322 and the guide hole 31 form an aligned communication, so that the melted semi-solid compound 7 can flow into the guide cylinder 4 through the guiding action of the guide hole 31 and the guide groove 322. The guiding cylinder 4 includes a space portion 45 extending through the two upper and lower end faces, a seat portion 40 received in the receiving groove 24, and a sleeve portion 4 which is in contact with the locking member 5. 1 and an extension portion 42 having a smaller size than the sleeve portion 41, wherein the extension portion 42 and the socket portion 41 are in a class shape, or the extension portion 42 is tapered (ie, from the end of the socket portion 41) The top end of the guide cylinder 4 is tapered and converged so that the guide cylinder 4 can be inserted into the receiving portion 53 of the locking member 5, so that only the socket portion 41 and the locking member 5 can be accommodated. The partial inner wall surfaces of the portion 53 form a direct contact, and the extension portion 42 does not directly contact the inner wall surface of the accommodating portion 53 of the lock member 5 to reduce the direct contact between the guide cylinder 4 and the lock member 5. The locking member 5 includes a threaded portion 50 screwed to the thread 241 of the body 2, a pulling portion 51 located above the threaded portion 50, a surrounding portion 52 located above the pulling portion 51, and An accommodating portion 53 that is axially penetrated; wherein the accommodating portion 53 is formed by the base hole 531 of the lower half and the spacing hole 532 of the upper half, and the spacing hole 532 is tapered toward the enlarged hole Or the diameter of the spacing hole 532 is larger than the diameter of the base hole 531 to form a direct contact between the base hole 531 of the receiving portion 53 and the socket portion 41 of the guiding cylinder 4, and the receiving portion 53 is formed. The spacing hole 532 and the guiding cylinder 4 are kept at an appropriate distance (not in contact); when assembling, only the needle holder 30 of the guiding needle 3 is first placed in the receiving groove 24 of the body 2, and then the guiding cylinder 4 is The space area 45 is placed on the needle bar 32 of the guide needle 3 until the seat portion 40 of the guide cylinder 4 is placed on the needle holder 30 of the guide needle 3, and the needle tip 321 end of the guide needle 3 can be It can protrude from the end of the space area 45 of the guide cylinder 4, so that the outlet A formed between the needle 321 section of the needle bar 32 of the guide needle 3 and the upper end of the space area 45 of the guide cylinder 4 is in a normal state. Closed open state (as shown in FIG. 4); at this time, the receiving portion 53 of the locking member 5 is directly placed on the sleeve portion 41 of the guiding cylinder 4, and the threaded portion 50 of the locking member 5 is utilized. Can be directly screwed onto the thread 241 of the body 2, forcing the seat 40 of the guide barrel 4 and the guide The needle holder 30 of the needle 3 can be sandwiched between the bottom surface of the locking member 5 and the cavity 24 of the body 2; at this time, the heating element 6 is placed from above the shaft portion 21 of the body 2 to the lower side thereof. Until the bottom edge of the heating element 6 is placed in the recess 22 of the body 2, and the electric wire 61 of the heating element 6 is connected to the outside of the slot 201 and connected to the outside; finally, the above components can be placed together in the mold 1 In the cavity 10, the preliminary assembly can be completed (as shown in Fig. 5); when used, the heat-fusible semi-cured compound 7 is pushed by the pressurizing force from the machine (Fig. In the shaft hole 23 of the body 2, it flows into the guide groove 322 of the guide needle 3 and the space area 45 of the guide barrel 4 through the guide hole 31 of the guide needle 3, and finally, Then, it flows into the molding cavity 11 of the mold 1 through the outlet A of the guide cylinder 4 (as shown in Figs. 5 and 6); however, due to the base 20 of the body 2 and the partial surrounding portion 52 of the locking member 5 Forming direct contact with the cavity 10 of the mold 1 respectively, and the sleeve portion 41 of the guide cylinder 4 directly forms a direct connection with the inner wall surface of the partial receiving portion 53 of the lock member 5 (the base hole 531 of the lower half) Contact, and The extension portion 42 of the cartridge 4 does not directly contact the inner wall surface of the spacing hole 532 of the upper half of the receiving portion 53 of the locking member 5, so as to greatly reduce the contact area between the guiding cylinder 4 and the locking member 5 and heat conduction. Rate, and the high heat temperature generated by the heating element 6 is sequentially transmitted to the guide needle 3, the guide barrel 4 and the lock member 5 via the body 2, and the hot-melt-cured semi-cured compound 7 is added. It is located in the space area 45 between the guide needle 3 and the guide cylinder 4 (that is, the rubber material 7 is covered by the guide cylinder 4 to prevent the contact of the rubber material 7 and the mold 2 before the injection is performed), and therefore, when the heat is high When the high temperature is conducted to the extension portion 42 of the guide cylinder 4 via the body 2, the temperature at the extension portion 42 is slightly lower than the temperature of the body 2 due to some loss or loss of thermal energy during heat conduction. However, the hot melt prepreg 7 in the space region 45 (i.e., the front end of the guide cylinder 4) at the opposite extension 42 or at the outlet A of the guide cylinder 4 is also protected by heat conduction. Hold at a certain heating temperature (ie, in a molten state), without forming a thin film of cooling film on the surface of the rubber material, so as to effectively reduce the cooling hardened film due to the outer surface of the rubber material 7 along with the melting The flow marks formed by the flow of the rubber compound are distributed on the outer surface of the finished product 9 (as shown in Fig. 7) near the pouring point, thereby greatly improving the production yield after the injection.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention; therefore, any changes or modifications to the features and spirits described in the scope of the present application should include Within the scope of the patent application of this creation.

Claims (10)

An open hot runner gate structure includes: a body having a shaft hole penetrating therein, and a hole is formed at the other end of the shaft hole, and a thread is formed on the inner wall of the other end of the groove for The locking component is screwed together, and the needle seat of the guiding needle and the seat of the guiding cylinder are sequentially placed between the cavity of the body and the locking component, and the needle needle cone of the guiding needle is arranged The outlet formed between the segment and the upper end of the space region of the guiding cylinder is in an open state in a normally unclosed state; the guiding needle is provided with a needle seat accommodated in the cavity, a guiding hole penetrating through the needle seat, And a needle bar inserted into the space region of the guiding cylinder; the guiding cylinder is provided with a space region extending between the two upper and lower end faces, a seat portion accommodated in the cavity, and a locking member contacting the locking member a socket portion and an extension portion having a smaller size than the socket portion; the locking member has a threaded portion screwed to the thread of the body, a pulling portion located above the threaded portion, and a locking portion An upper surrounding portion and an axially extending receiving portion; by the above configuration, the sleeve of the guiding cylinder can be nested in In the accommodating portion of the fitting, the sleeve portion can only form a direct contact with the inner wall surface of the accommodating portion of the locking member, and the extension portion and the inner wall surface of the accommodating portion of the locking member can maintain a certain distance without Direct contact will be formed to reduce the direct contact area and thermal conductivity between the guide cylinder and the lock member, thereby maintaining the outlet of the guide cylinder above a certain heating temperature. The open hot runner gate structure according to claim 1, wherein the extension portion of the guide cylinder and the socket portion are in a class shape, so that the extension portion and the receiving portion of the lock member are The inner wall surface maintains a proper distance gap without direct contact, and has a direct contact area and thermal conductivity between the guide barrel and the lock member. An open hot runner gate structure as described in claim 2, wherein the guide barrel The extension portion has a tapered shape (that is, the end of the sleeve portion is tapered toward the tip end surface of the guide tube), so that the extension portion and the inner wall surface of the receiving portion of the lock member maintain an appropriate distance gap. It does not form direct contact, but has a direct contact area and thermal conductivity between the guide barrel and the lock member. The open hot runner gate structure according to claim 1, wherein the needle end of the needle bar is formed with a needle cone, and a guide groove is formed on the side of the needle bar, and The guiding groove and the guiding hole form an aligned communication shape, so that the melted semi-solid rubber can flow into the guiding cylinder through the guiding action of the guiding hole and the guiding groove. The open hot runner gate structure of claim 1, wherein the body comprises at least a base, a shaft portion perpendicular to the base, and a ring between the base and the shaft portion. a groove, and the base is provided with a groove, the groove is connected to the annular groove and the outer side of the base, so that the heating element can be sleeved outside the shaft portion and the bottom end of the heating element The edge can be placed in the annular groove and the wires of the heating element can be connected from the slot to the outside. An open hot runner gate structure includes: a body having a shaft hole penetrating therein, and a hole is formed at the other end of the shaft hole, and a thread is formed on the inner wall of the other end of the groove for The locking component is screwed together, and the needle seat of the guiding needle and the seat of the guiding cylinder are sequentially placed between the cavity of the body and the locking component, and the needle needle cone of the guiding needle is arranged The outlet formed between the segment and the upper end of the space region of the guiding cylinder is in an open state in a normally unclosed state; the guiding needle is provided with a needle seat accommodated in the cavity, a guiding hole penetrating through the needle seat, And a needle bar inserted into the space region of the guiding cylinder; the guiding cylinder is provided with a space region extending through the two upper and lower end faces, a seat portion accommodated in the cavity, and a sleeve that is in contact with the locking member Combined socket; The locking member has a threaded portion screwed to the thread of the body, a pulling portion located above the threaded portion, a surrounding portion located above the pulling portion, and an axially extending receiving portion; The accommodating portion is composed of a base hole of the lower half and a spacing hole of the upper half; by the above configuration, the socket of the guide cylinder can be nested in the accommodating portion of the lock member. In the base hole, the sleeve portion is in direct contact with the inner wall surface of the base hole, and the sleeve portion of the guide tube and the inner wall surface of the spacer hole of the receiving portion of the lock member are kept at a certain distance without direct contact. In order to reduce the direct contact area between the guide cylinder and the lock member and the thermal conductivity, the outlet of the guide cylinder is maintained at a certain heating temperature or higher. The open hot runner gate structure according to claim 6, wherein the spacing holes are tapered holes that are enlarged toward the outside, so that the inner wall surfaces of the spacing holes of the guiding cylinder and the locking member are properly maintained. The distance is not formed by direct contact, but has a direct contact area and thermal conductivity between the guide barrel and the lock member. The open hot runner gate structure according to claim 6, wherein the diameter of the spacing hole is larger than the diameter of the base hole, so that the inner wall of the spacing hole of the guiding cylinder and the locking member is retained. Appropriate distance clearance without direct contact, but with reduced direct contact area and thermal conductivity between the guide barrel and the closure. The open hot runner gate structure according to claim 6, wherein the needle end of the needle bar is formed with a needle cone, and a guide groove is formed on the side of the needle bar, and The guiding groove and the guiding hole form an aligned communication shape, so that the melted semi-solid rubber can flow into the guiding cylinder through the guiding action of the guiding hole and the guiding groove. The open hot runner gate structure of claim 6, wherein the body comprises at least a base, a shaft portion perpendicular to the base, and a ring between the base and the shaft portion. a groove having a groove at the base, the groove being connected to the annular groove and the outer side of the base so that the heating element can be placed outside the shaft portion and the heating element is The bottom edge can be placed in the annular groove and the wires of the heating element can be connected from the slot to the outside.