TWI785450B - Hot runner nozzle structure - Google Patents

Abstract

The present invention at least includes: the body is axially provided with a through-shaped shaft hole, and the other end of the shaft hole is connected to form a container, and a threaded part is formed on the inner wall edge of the container for the locking member to be screwed. fit at the threaded part, and can clamp the seat of the material guide tube between the container of the body and the bottom end surface of the locking piece; the locking piece includes at least one driving part for the tool to be pulled , the external thread extending downward from the driving part and screwed to the threaded part of the body, the surrounding part extending upward from the driving part, an axial setting and used for the accommodating limit of the guide tube The mandrel hole, and the accommodating part arranged on the inner side of the surrounding part and connected to the mandrel hole; the material guiding cylinder at least includes a seat part sandwiched between the container of the body and the locking part, A body section extending upward from the seat and protruding outside the lock, a chamber between the seat and the body section, and a pipe that runs through the top surface of the body section and communicates with the chamber. The injection hole; the thermal guide is arranged between the guide cylinder and the locking member.

Description

Hot runner nozzle structure

The present invention relates to a hot runner; in particular, it relates to a nozzle structure of the hot runner that can minimize the temperature loss at the end of the material guide cylinder and increase the fluidity inside it to improve the injection yield.

According to the conventional hot runner structure, please refer to Figures 1 to 2, which include: a body 10 with a through-shaped shaft hole 100 and assembled at a heat flow plate 25, and a shaft hole 100 that can fit in the body 10 A valve needle rod 12 for moving back and forth, a heating coil 11 surrounding the outer circumference of the body 10, a set of locking parts 13 arranged at the body 10, and a container 101 sandwiched between the body 10 and the body 10 The material guide cylinder 14 between the locking parts 13; the axial direction of the body 10 is provided with a through-shaped shaft hole 100, which can accommodate the valve needle rod 12 and the hot-melt semi-solid plastic blank (not shown in the figure) It is placed in the shaft hole 100 to move, and the other end of the shaft hole 100 is connected to form a container 101, and a threaded part 102 is formed on the inner wall edge of the container 101, so that the locking member 13 can be screwed on The threaded portion 102, and the seat portion 140 of the material guide cylinder 14 can be sandwiched between the container groove 101 of the body 10 and the bottom end surface of the locking member 13, and the shaft hole 100 and the material guide The housing chamber 142 of the cylinder 14 and the injection hole 143 are connected in a coaxial shape; the lock member 13 includes a driving part 131 for a tool (not shown) to be pulled, and extends downward from the driving part 131. Cum screwed to the body 1 The external thread 132 at the threaded part 102 of 0, the surrounding part 133 formed by extending upwards from the driving part 131, an axially arranged mandrel hole 134 that is used for accommodating and limiting the guide cylinder 14, and setting In the surrounding portion 133 and connected to the accommodating portion 135 at the mandrel hole 134, the mandrel hole 134 is sleeved and limited to the barrel section 141 of the material guide tube 14, and the barrel section 141 can protrude It extends outside (or above) the accommodating portion 135, and keeps the accommodating portion 135 and the barrel section 141 in a non-contact state; 101 to the seat portion 140 between the lock member 13, a cylinder section 141 extending upward from the seat portion 140 and accommodated in the mandrel hole 134 and protruding from the outside of the accommodating portion 135, a barrel section 141 located at The chamber 142 between the seat portion 140 and the barrel section 141, and a filling hole 143 passing through the top surface of the barrel section 141 to communicate with the chamber 142, so that when the force is applied to the end of the valve needle rod 12 When pulling inwardly to the inside of the chamber 142 (i.e. retracted), the injection hole 143 of the material guide tube 14 can be opened (i.e. not blocked by the valve needle rod 12), so that the The hot-melt semi-solid plastic blank (not shown) flowing into the shaft hole 100 of the main body 10 will be guided along the inner wall surface of the housing chamber 142 of the guide tube 14 from the periphery of the valve needle rod 12 direction and flow into the chamber 142 and the injection hole 143 in sequence, and then inject into the mold cavity 21 of the mold 2 until the mold cavity 21 is filled; 12 end pushes outwards (that is, towards the mold cavity 21 of the mold 2 ), so that the end of the valve needle rod 12 will guide along the inner wall of the guide tube 14 and block between the injection hole 143 and the mold 2 Injecting into the port 20 (as shown in FIG. 2 ), the output of one plastic injection action can be completed.

Although the above-mentioned creative projects can achieve the originally set creative goals, they are highly praised by the industry and general operators. However, due to the industry's unremitting efforts in research and development and continuous technological innovation and breakthroughs, the applicants have to work harder to research To make it perfect and practical; in addition, the creators found that there are still the following problems that need to be further improved after numerous update experiments and tests and summarizing the feedback from consumers' actual operation and use:

In order to make the hot-melt semi-solid plastic blank injected into the mold cavity 21 solidify quickly, a plurality of cooling pipelines 23 are usually buried around the mold cavity 21, so that the entire surface of the mold 2 The temperature will be in a cold or ice-cold state, especially, the position where the heat flow plate 25 and the top surface of the material guide cylinder 14 are in contact with the mold 2 will have a more obvious cooling phenomenon (including the heat flow plate 25 and the material guide cylinder 14 top surface), in addition, the outer side of the surrounding part 133 of the locking part 13 is in contact with the heat flow plate 25 (that is, the contact position near the mold 2), and the accommodating part inside the surrounding part 133 135 is kept out of contact with the barrel section 141 of the material guiding cylinder 14, so that the heat energy generated by the heating coil 11 surrounding the outside of the main body 10 can only be directly conducted to the material guiding cylinder 14 through the main body 10 by contact heat After the seat portion 140 and the external thread 132 of the locking member 13, the heat is conducted to the lower half of the barrel section 14. At this time, when the lower half of the barrel section 14 starts to conduct heat upward, the 14 The air cooling effect formed by the upper half of the first half not directly contacting the heat flow plate 25 and the cooling effect formed by the top surface of the material guide cylinder 14 contacting the mold 2, so that the injection hole 143 of the material guide cylinder 14 The temperature (cooled) is not as good as the (original high heat) temperature already located in the chamber 142 of the material guide tube 14, so that the hot melt semi-solid state The fluidity of the plastic blank is not good, and it will cause the end of the mold cavity 21 to be injected into the mold cavity 21 to be difficult to be filled, which will lead to an increase in the defect rate of the cooled prototype embryo, which is a major problem.

As mentioned above, since the space between the outer periphery of the injection hole 143 of the material guide cylinder 14 and the inner wall of the mold 2 will be covered with hardened rubber after the material is cooled during the intermittent and discontinuous injection, even though it has been heated The indirect heating effect of the coil 11 can turn the hardened rubber material adjacent to the material injection hole 143 of the material guide tube 14 into a molten state again (that is, near the surface of the material guide tube 14 ), so as to facilitate melting After the rubber material is pressed, it can be attached to the surface of other hot-melt plastic blanks and discharged together. However, the surface of the cooling rubber material adjacent to the inner wall of the cooling mold 2 will only be heated by the indirect distance from the heating coil 11. And form local melting, even still can remain the thin film phenomenon that forms a cooling crystallization hardening layer on the outer surface of rubber material, so that the part melt-like rubber material and another part cooling crystallization hardening layer film that have been positioned at the outer peripheral side of the material guide cylinder 14 It will be injected together (i.e. discharge) through high-pressure impact. At this time, the film of the cooled crystallized hardened layer will be injected into the mold of the mold 2 from the pouring point along with the flow of the molten rubber. In the cavity 21, the film of the cooling crystal hardened layer will flow with the flow of the molten rubber, and the film will be distributed on the outer surface of the finished product near the pouring point, so that the outer surface of the pouring point of the finished product will form There are irregular flow marks, and it is easy to be mistaken for defective products as another major problem.

Therefore, how to develop a device that can minimize the temperature loss at the end of the guide tube, increase its internal fluidity, and improve the product yield after injection is currently a priority for the industry. topic.

The main content of the hot runner nozzle structure of the present invention is to provide a The lock is assembled at the body, so that the guide cylinder is sandwiched between the body and the lock, and the upper half of the body of the guide cylinder can be connected with the lock The accommodating part of the fitting is kept in a non-contact state, and a heat guide is set between the guide cylinder and the lock, and the inner and outer walls of the heat guide are respectively connected to the lower half of the body of the guide tube. Keep in contact with the mandrel hole or accommodating part of the lock, so that the heat energy can be directly transferred to the top surface of the material guide tube (that is, the upper half of the tube body); in this way, the material guide tube can be The temperature loss on the top surface can be minimized, and the fluidity of the hot-melt semi-solid plastic blank already located in the guide tube can be increased, thereby greatly improving the product yield after injection, which is an advanced proposition.

In order to achieve the above-mentioned purpose of creation, the main technical means of the present invention at least includes: a body with a through-shaped shaft hole and assembled at a heat flow plate, a valve needle that can move back and forth in the shaft hole of the body Rod, a heating coil around the outer peripheral side of the body, a set of locking parts arranged on the body, a material guide tube sandwiched between the container of the body and the locking parts, and a clamping The thermal conductor between the guide cylinder and the locking member; wherein: the main body is provided with a through-shaped shaft hole in the axial direction, so that the valve needle rod and the hot-melt semi-solid plastic blank can be accommodated in the The shaft hole is movable, and the other end of the shaft hole is connected to form a groove, and a threaded part is formed on the inner wall edge of the groove, so that the locking part can be screwed on the threaded part, and the The seat of the material guide tube is sandwiched between the container of the body and the bottom end surface of the lock, and the shaft hole is concentrically connected with the chamber of the material guide tube; the valve needle rod It is accommodated in the shaft hole of the body, the chamber of the material guide cylinder, the injection hole and the injection port of a mold for reciprocating movement, and the end of the valve needle rod is blocked in the injection hole of the material guide cylinder and the injection port of the mould, so that it is in a closed state under normal conditions; the locking member includes at least one driving part for the tool to be pulled, extending downward from the driving part The external thread that is screwed on the threaded part of the body, the surrounding part formed by extending upward from the driving part, an axially arranged mandrel hole that is used for the accommodating and limiting of the guide tube, and the The surrounding part is also connected to the accommodating part of the mandrel hole, the mandrel hole is set and limited at the barrel section of the material guide tube, and the barrel section can protrude from the outside of the accommodating part ( or above), and keep the accommodating part and the cylinder section in a non-contact state; the material guide cylinder at least includes a seat sandwiched between the container of the body and the lock piece, and a seat upward from the seat a body section extending and protruding from the outer side of the locking member, a recessed chamber arranged between the seat and the body section, and a filling hole passing through the top surface of the body section to communicate with the chamber; The chamber is used for the valve needle rod and the hot-melt semi-solid plastic blank to be accommodated in it; ring surface, and the through-shaped socket hole that has been located in the vertical ring surface and sleeved at the barrel section; when the heat guide is placed between the material guide cylinder and the locking piece, the The vertical ring surface must be in contact with the mandrel hole or accommodating part of the locking part, and make the sleeve hole of the heat guide part contact with the barrel section of the material guide tube.

[customary]

10: Ontology

100: shaft hole

101: storage tank

102: threaded part

11: Heating coil

12: Valve needle rod

13: Locking parts

131: drive unit

132: external thread

133: Surrounding Department

134: mandrel hole

135:Accommodating part

14: Guide cylinder

140: Block

141: cylinder body

142: Containment room

143: injection hole

2: Mold

20: injection port

21: Mold cavity

23: Cooling pipeline

25: Heat flow plate

[this invention]

40:Mold

400: injection port

401: mold cavity

45: Heat flow plate

5: Ontology

50: shaft hole

51: storage tank

52: threaded part

58: Heating coil

6: Valve needle rod

7: Locking parts

71: drive department

72: external thread

73: Surrounding Department

74: mandrel hole

75:Accommodating part

8: Guide barrel

80: Block

81: cylinder body

82: Containment room

83: Injection hole

9: Thermal guide

90: vertical torus

91: socket hole

Fig. 1 is a conventional three-dimensional exploded schematic diagram.

Figure 2 is a partial combined sectional view when Figure 1 is applied.

Fig. 3 is a three-dimensional exploded view of the present invention.

Figure 4 is a partial combined section view when Figure 3 is applied.

The present invention is related to a hot runner jet nozzle structure, please refer to the 3rd As shown in Figures 4 to 4, it at least includes: a body 5 with a through-shaped shaft hole 50 and assembled at a heat flow plate 45, a valve needle rod that can move back and forth in the shaft hole 50 of the body 5 6. A heating coil 58 surrounding the outer peripheral side of the body 5, a set of locking pieces 7 provided at the body 5, a guide sandwiched between the groove 51 of the body 5 and the locking piece 7 Barrel 8, and a thermal conductor 9 sandwiched between the guide barrel 8 and the locking member 7; wherein: the body 5 is axially provided with a through-shaped shaft hole 50 for the valve needle rod 6 and hot-melt semi-solid plastic blank (not shown) can be accommodated in the shaft hole 50, and the other end of the shaft hole 50 is connected to form a container 51, and in the container 51 A threaded portion 52 is formed on the edge of the wall, so that the locking member 7 can be screwed on the threaded portion 52, and the seat portion 80 of the guide tube 8 can be clamped between the groove 51 of the body 5 and the lock. between the bottom end surfaces of the assembly 7, and make the shaft hole 50 and the chamber 82 of the guide tube 8 concentrically connected; the valve needle rod 6 is accommodated in the shaft hole of the body 5 50 and the chamber 82 of the guide tube 8, the injection hole 83, and the injection port 400 of a mold 40 are moved back and forth, and the end of the valve needle rod 6 is blocked in the injection hole 83 of the guide tube 8 and the injection port 400 of the mold 40, so that it is in a closed state under normal conditions; The external thread 72 that extends downward and is screwed on the threaded part 52 of the body 5, the surrounding part 73 formed by extending upward from the driving part 71, and an axial setting that is used to accommodate and limit the guide tube 8 The mandrel hole 74 used, and the accommodating portion 75 that is arranged in the surrounding portion 73 and communicates with the mandrel hole 74, the The mandrel hole 74 is sleeved and limited at the barrel section 81 of the material guide tube 8, and the barrel section 81 can protrude outside (or above) the accommodation portion 75, and the accommodation portion 75 and The barrel section 81 remains in an uncontacted state;

The material guide cylinder 8 at least includes a seat 80 sandwiched between the container 51 of the body 5 and the lock piece 7 , and a seat 80 extending upward from the seat 80 and protruding outside the lock piece 7 . The barrel section 81, a recessed chamber 82 arranged between the seat 80 and the barrel section 81, and a filling hole 83 that runs through the top surface of the barrel section 81 and communicates with the chamber 82; the chamber 82 is for the valve needle rod 6 and the hot-melt semi-solid plastic blank material to be accommodated in it for activities;

The heat guide 9 at least includes a vertical ring surface 90 interposed and in contact with the material guide cylinder 8 to the locking member 7, and has been located in the vertical ring surface 90 and sleeved at the barrel section 81 The through-shaped socket hole 91; when the heat guide 9 is placed between the guide cylinder 8 and the lock 7, the vertical ring surface 90 of the heat guide 9 must be in contact with the center of the lock 7 shaft hole 74 or accommodating portion 75, and make the sleeve hole 91 of the heat guide 9 contact the body section 81 of the material guide cylinder 8; and the above heat guide 9 is made of non-ferrous metal Made of, in particular, gold (containing pure elements or their alloys), or silver (containing pure elements or their alloys), or copper (containing pure elements or their alloys), or aluminum (containing pure elements or their alloys) optimal;

When injection molding is desired, the end of the needle rod 6 is forced to be pulled to the inside of the chamber 82 (that is, retracted), so that the injection hole 3 of the guide tube 8 can be opened ( That is, it is not blocked by the valve needle rod 6), so that the hot-melt semi-solid plastic blank (not shown) that has flowed into the shaft hole 50 of the body 5 will flow along the valve needle The guide direction between the periphery of the rod 6 and the inner wall surface of the chamber 82 of the material guide cylinder 8 flows into the chamber 82 and the injection hole 83 in sequence; Between the barrel 8 and the locking part 7, in other words, the outer peripheral side of the vertical ring surface 90 of the heat conducting part 9 must be in contact with the mandrel hole 74 or the accommodating part 75 of the locking part 7, and make the thermal The inner wall surface of the socket hole 91 of the guide member 9 can be in contact with the cylinder body section 81 of the material guide cylinder 8. In addition, the heat guide member 9 is made of a non-ferrous metal material, especially gold (including pure elements or their alloys), or silver (containing pure elements or their alloys), or copper (containing pure elements or their alloys), or aluminum (containing pure elements or their alloys) is the best; The heat energy generated by the heating coil 58 on the outer peripheral side of the main body 5 is directly conducted to the seat portion 80 of the material guide cylinder 8 and the external thread 72 of the locking member 7 through the main body 5, and then heat is conducted to the material guide respectively. The lower half of the barrel section 81 of the cylinder 8 and the mandrel hole 74 of the locking member 7 and its accommodating part 75 (that is, the lower half of the barrel section 81 is adjacent to the sleeve hole 91 of the heat conducting member 9 and the mandrel hole 74 are adjacent to the vertical ring surface 90 of the thermal guide 9), and then the thermal energy can be quickly conducted to the upper half of the barrel section 81 through the thermal guide 9 to reduce the thermal energy Intangible loss, and the temperature loss of the injection hole 83 on the top surface of the material guide cylinder 8 can be minimized, and the fluidity of the hot-melt semi-solid plastic blank will not be impaired. Finally, Flow through the injection port 400 of the mold 40 from the injection hole 83 and then inject it into the mold cavity 401 of the mold 40 until the hot-melt semi-solid plastic blank is filled in the mold cavity 401; That is, the control of starting injection is completed;

On the contrary, when the residence time is up, force will be applied to push the end of the valve needle rod 6 to the outside (that is, towards the mold cavity 401 of the mold 40), so that the valve The end of the needle bar 6 will be guided along the inner wall of the guide tube 8 and blocked in the injection hole 83 and the injection port 400 of the mold 40 (as shown in Figure 4), and the output of a plastic injection can be completed. ;

The present invention uses the above-mentioned structure to maintain contact with the inner and outer wall surfaces of the heat guide member 9 respectively with the lower half of the body section 81 of the material guide cylinder 8 and the spindle hole 74 or the accommodating portion 75 of the locking member 7, In order to make heat conduction directly to the top surface of the material guide cylinder 8 (that is, the upper half of the cylinder body section 81), the temperature loss on the top surface of the material guide cylinder 8 can be reduced to the minimum, and the temperature already located in the material guide cylinder can be increased. The fluidity of the hot-melt semi-solid plastic blank inside the cylinder 8 can improve the product yield after injection as its progressive effect.

The above are only preferred embodiments of the present invention, and are not used to limit the scope of the present invention; therefore, all equivalent changes or modifications made according to the characteristics and spirit described in the scope of the application of the present invention should include Within the patent scope of the present invention.

5: Ontology

51: storage tank

52: threaded part

58: Heating coil

7: Locking parts

71: drive department

72: external thread

73: Surrounding Department

74: mandrel hole

75:Accommodating part

8: Guide barrel

80: Block

81: cylinder body

83: Injection hole

9: Thermal guide

90: vertical torus

91: socket hole

Claims (10)

A hot runner nozzle structure, which at least includes: a body with a shaft hole and assembled at a heat flow plate, a valve needle rod that can move back and forth in the shaft hole of the body, and a ring around the outer periphery of the body The heating coil, the locking piece assembled at the body, the material guide cylinder sandwiched between the container of the body and the lock piece, and the heat guide tube sandwiched between the material guide cylinder and the lock piece Guide piece; wherein: the body is provided with a shaft hole in the axial direction, and the other end of the shaft hole is connected to form a container, and a threaded portion is formed on the inner wall edge of the container for the locking member to be screwed Fit at the threaded part, and can sandwich the seat of the guide tube between the container of the body and the bottom end surface of the locking piece; the locking piece at least includes a driving force for the tool to pull part, an external thread extending downward from the driving part and screwed to the threaded part of the body, a surrounding part extending upward from the driving part, an axial setting and a position limit for the guide cylinder The mandrel hole used, and the accommodating part arranged on the inside of the surrounding part and connected to the mandrel hole; the guide tube at least includes a seat sandwiched between the container of the body and the lock piece part, the barrel section extending upward from the seat and protruding outside the lock piece, the chamber arranged between the seat and the barrel section, and the injection hole that runs through the top surface of the barrel section and communicates with the chamber. The material hole; the heat guide, which is arranged between the material guide cylinder and the lock piece; through the above structure, the heat guide is respectively connected to the lower half of the cylinder body section of the material guide cylinder and the lock The mandrel hole or the accommodating portion of the component is kept in contact so that the heat energy can be directly transferred to the top surface of the material guide tube (that is, the upper half of the tube body), so that the temperature loss on the top surface of the material guide tube can be minimized , and can increase the The fluidity of the hot-melt semi-solid plastic blank in the interior greatly improves the product yield after injection. The hot runner nozzle structure as described in item 1 of the claim, wherein the heat guide at least includes a vertical ring surface sandwiched and contacted between the material guide cylinder and the locking part, and the vertical ring The through-shaped socket hole is placed in the surface and placed at the section of the barrel. The structure of the hot runner jet nozzle as described in Item 2 of the claim, wherein the vertical ring surface of the heat guide must be in contact with the mandrel hole or the receiving part of the lock, and the heat guide The socket hole can be in contact with the tube body of the material guide tube. The hot runner nozzle structure according to one of the items 1 to 3 of the claims, wherein the heat guide is made of non-ferrous metal material. The hot runner nozzle structure as described in item 4 of the claim, wherein, the thermal conductor is made of gold (containing pure elements or their alloys), or silver (containing pure elements or their alloys), or copper (containing pure elements or its alloys), or aluminum (containing pure elements or its alloys) is the best. The hot runner jet nozzle structure as described in item 5 of the claim, wherein, the shaft hole and the housing chamber of the material guiding cylinder are concentrically connected. The hot runner nozzle structure as described in item 6 of the claim, wherein the mandrel hole is set at the barrel section of the material guide cylinder, and the barrel section can protrude from the receiving part outside (or above), and keep the accommodating part and the barrel section in a non-contact state. The structure of the hot runner spout nozzle as described in item 7 of the claim, wherein the shaft hole is used for the valve needle rod and the hot-melt semi-solid plastic blank to be accommodated and moved therein. The structure of the hot runner spout nozzle as described in item 8 of the claim, wherein the chamber is used for the valve needle rod and the hot-melt semi-solid plastic blank to be accommodated and moved therein. The structure of the hot runner jet nozzle as described in item 9 of the claim, wherein the valve needle rod is accommodated in the shaft hole of the body, the chamber of the guide tube, and the injection hole for reciprocating movement, and Under normal conditions, the end of the needle rod is blocked in the injection hole of the guide tube to form a closed state.

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