Valve needle driving structure and hot runner system

Abstract

A valve needle driving structure and a hot runner system belong to the technical field of molds, the valve needle driving structure comprises a cylinder body, a piston, a valve needle and a valve needle transition sleeve, the cylinder body is internally provided with a piston cavity with an opening at the lower end, and the valve needle transition sleeve is connected to the lower part of the cylinder body and seals the piston cavity; the piston is mounted in the piston cavity in a manner of moving up and down and divides the piston cavity into a needle sealing cavity and a needle opening cavity; a needle sealing air hole communicated with the needle sealing cavity and a needle opening air hole communicated with the needle opening cavity are respectively formed in the cylinder body, and the upper end of the valve needle is connected with the piston, so that a hot runner system in the traditional technology can be simply and conveniently modified by applying the technical scheme, the heat transferred to the cylinder body by the valve needle transition sleeve is reduced, and the heat transfer efficiency is improved. Heat loss is reduced, and energy consumption of a hot runner system is reduced; and meanwhile, excessive parts do not need to be subjected to adaptive transformation, the transformation cost is low, the manufacturing difficulty is low, industrial upgrading is facilitated, and energy consumption of a traditional hot runner system is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and in particular relates to a valve needle drive structure and a hot runner system. Background Art

[0002] With the development of hot runner technology, needle valve hot runners are becoming increasingly popular among companies. Needle valve hot runners can effectively control product weld marks and reduce product deformation during injection molding. They also provide beautiful sprue appearance and high overall product quality.

[0003] The hot runner system of traditional technology is shown in the Chinese invention patent application document with patent application number 200580039053.3, which discloses an improved valve gate for a hot runner injection molding machine, wherein the valve needle is driven by a cylinder assembly, which includes a cylinder body and a piston. The piston moves up and down as the air pressure in the cylinder changes, thereby driving the valve needle to move. However, the cylinder body and the bushing in this technology are set as an integrated structure, and the bushing needs to insulate the passing molten material, so it needs to be made of high thermal conductivity material. Therefore, in the hot runner system of traditional technology, the cylinder body and the bushing need to be made of high thermal conductivity material as an integrated whole, which has a high manufacturing cost, a large amount of processing waste, a complex manufacturing process, and a high difficulty; and the heat of the bushing is easily transferred to the cylinder body, causing a large heat loss, resulting in high energy consumption of the hot runner system.

[0004] Due to the inherent structures of the traditional hot runner system, such as the installation structure and gas path structure, the modification of the hot runner system is costly and difficult, which is not conducive to the upgrading and energy saving of the traditional hot runner system. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a valve needle drive structure and a hot runner system.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A valve needle drive structure includes a cylinder body, a piston, a valve needle and a valve needle transition sleeve, the cylinder body is provided with a piston chamber with an opening at the lower end, the valve needle transition sleeve is connected to the bottom of the cylinder body and seals the piston chamber, the piston is installed in the piston chamber so as to be movable up and down and divides the piston chamber into a sealing needle chamber and an opening needle chamber; the cylinder body is respectively provided with a sealing needle air hole connected to the sealing needle chamber and an opening needle air hole connected to the opening needle chamber, the upper end of the valve needle is connected to the piston, the interior of the valve needle sleeve is provided with a valve needle transition position passing through along the axis, the valve needle can move up and down along the valve needle transition position and its lower end passes through the valve needle transition position.

[0008] In the present invention, the valve needle transition sleeve includes a connecting positioning section and a main body section which are sequentially arranged along the axis from top to bottom. The connecting positioning section is connected to the bottom of the cylinder body and seals the piston chamber. The valve needle transition position includes a valve needle transition hole and a glue outlet channel which are sequentially arranged along the axis from top to bottom. The outer wall of the main body section is provided with a glue inlet channel which extends inward and is connected to the glue outlet channel.

[0009] In the present invention, the connection and positioning section has an overflow and glue discharge hole which runs through the left and right sides and is connected with the valve needle transition hole.

[0010] In the present invention, the sealing needle air hole is arranged on the top surface of the cylinder body, and it passes through the top wall of the cylinder body; the opening needle air hole includes a first ventilation section and a second ventilation section, the first ventilation section extends from the top surface of the cylinder body and along the side wall of the cylinder body outside the piston cavity, one end of the second ventilation section is connected to the first ventilation section, and the other end passes through the side wall of the cylinder body and is connected to the piston cavity.

[0011] In the present invention, the number of the needle sealing air hole is one, which is arranged at the center of the top surface of the cylinder body; the number of the needle opening air holes is multiple, which are arranged in sequence along the circumference of the cylinder body.

[0012] In the present invention, a ventilation annular groove is provided on the top surface of the cylinder body, and the first ventilation section is connected to the ventilation annular groove.

[0013] In the present invention, a cylinder sealing ring groove is provided on the top surface of the cylinder body between the sealing needle air hole and the opening needle air hole, and a cylinder sealing ring is installed in the cylinder sealing ring groove; the outer peripheral surface of the piston is slidably matched with the inner wall of the piston cavity, and the outer peripheral surface of the piston is provided with a piston sealing ring groove, and a piston sealing ring is installed in the piston sealing ring groove.

[0014] Based on the valve needle drive structure provided above, the utility model also provides a hot runner system, including a driver plate and the valve needle drive structure as described above; the bottom surface of the driver plate has a driver mounting position, and the cylinder body is arranged in the driver mounting position; the interior of the driver plate has a sealing needle air duct connected to the sealing needle air hole and an opening needle air duct connected to the opening needle air hole.

[0015] In the present invention, the hot runner system also includes a runner plate; the top surface of the runner plate has a transition sleeve mounting hole, the main body section of the valve needle transition sleeve is arranged in the transition sleeve mounting hole, and the connection positioning section of the valve needle transition sleeve is arranged against the top surface of the runner plate; the interior of the runner plate has a feed pipe and a discharge pipe, the feed pipe is connected to the glue inlet channel of the main body section, and the discharge pipe is located at the lower end of the transition sleeve mounting hole, and is coaxially connected to the glue outlet channel of the main body section and extends to the bottom surface of the runner plate.

[0016] In the present invention, the hot runner system also includes a nozzle plate and a glue inlet structure; the nozzle plate has a nozzle mounting hole, a nozzle structure is installed in the nozzle mounting hole, the nozzle structure includes a nozzle hole connected to the discharge pipe, the lower end of the valve needle passes through the valve needle transition position, the discharge pipe and the nozzle hole in sequence; the nozzle plate has a glue discharge pipe, the glue discharge pipe is connected to the overflow glue discharge hole of the connecting positioning section; the glue inlet structure is connected to the feed pipe.

[0017] The beneficial effects of the present invention are as follows: the valve needle drive structure can adapt to the gas path connection of the driver plate of the hot runner system in traditional technology, and the hot runner system of traditional technology can be simply modified by using this technical solution, so that the heat transferred from the valve needle transition sleeve to the cylinder body is reduced, the heat loss is reduced, and the energy consumption of the hot runner system is reduced; at the same time, there is no need to carry out adaptive modification of too many parts, the modification cost is low, the manufacturing difficulty is low, it is convenient for industrial upgrading, and the energy consumption of the traditional hot runner system is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the valve needle drive structure of this embodiment;

[0019] Figure 2 Schematic diagram of the structure of the cylinder body of this embodiment;

[0020] Figure 3 This is a schematic structural diagram of the valve needle transition sleeve of this embodiment;

[0021] Figure 4 Schematic diagram of the structure of the hot runner system of this embodiment;

[0022] Figure 5 Schematic diagram of the internal installation structure of the flow channel plate, valve needle drive structure and glue feeding structure of this embodiment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] like Figures 1 to 5 As shown, this embodiment discloses a valve needle driving structure, including a cylinder body 1, a piston 2, a valve needle 3 and a valve needle transition sleeve 4. The cylinder body 1 has a piston chamber 11 with an opening at the lower end. The valve needle transition sleeve 4 is connected to the bottom of the cylinder body 1. The upper supporting surface of the valve needle transition sleeve 4 is set against the cylinder body 1 and seals the piston chamber 11; the piston 2 can be mounted in the piston chamber 11 for movement up and down, and the piston 2 divides the piston chamber 11 into a sealing needle chamber 111 and an opening needle chamber 112; a sealing needle air hole 12 and an opening needle air hole 13 are respectively provided on the cylinder body 1, the sealing needle air hole 12 is connected to the sealing needle chamber 111, and the opening needle air hole 13 is connected to the opening needle chamber 112; the upper end of the valve needle 3 is connected to the piston 2, and the interior of the valve needle transition sleeve 4 has a valve needle transition position 41 that passes through the axis up and down and is adapted to the valve needle 3. The valve needle 3 can move up and down along the valve needle transition position 41 and its lower end passes through the valve needle transition position 41. In a specific implementation, the piston chamber 11 in the cylinder body 1 opens downward, and the valve needle transition sleeve 4 is arranged at the bottom of the cylinder body 1 to seal the opening of the piston chamber 11, thereby sealing the piston chamber 11. When the needle sealing hole 12 applies pressurized air to the needle sealing chamber 111, the air pressure in the needle sealing chamber 111 increases, causing the piston 2 to move downward in the piston chamber 11, driving the valve needle 3 to move downward, thereby achieving needle sealing. When the needle opening hole 13 applies pressurized air to the needle opening chamber 112, the air pressure in the needle opening chamber 112 increases, causing the piston 2 to move upward in the piston chamber 11, driving the valve needle 3 to move upward, thereby achieving needle opening. In this embodiment, the valve needle drive structure can adapt to the air path connection of the driver plate 6 of the hot runner system in traditional technology. The present technical solution can be used to simply transform the hot runner system of traditional technology, thereby reducing the heat transferred from the valve needle transition sleeve 4 to the cylinder body 1, reducing heat loss, and reducing the energy consumption of the hot runner system. At the same time, there is no need to adaptively transform too many components, the transformation cost is low, the manufacturing difficulty is low, it is convenient for industrial upgrading, and the energy consumption of the traditional hot runner system is effectively reduced.

[0027] In this embodiment, the valve needle transition sleeve 4 includes a connecting and positioning section 42 and a main body section 43. The connecting and positioning section 42 is connected to the bottom of the cylinder body 1 and seals the piston chamber 11. The upper supporting surface of the connecting and positioning section 42 is arranged against the cylinder body 1. The valve needle transition position 41 includes a valve needle transition hole 411 and a glue outlet channel 412 arranged in sequence from top to bottom along the axis. The outer wall of the main body section 43 is provided with a glue inlet channel 431 extending inward and connected to the glue outlet channel 412. The connecting and positioning section 42 has overflow glue discharge holes 44 that pass through the left and right sides and are connected to the valve needle transition hole 411; the glue inlet channel 431 extends inward from the outer circumference of the main body section 43. The glue outlet channel 412 is coaxial with the valve needle transition hole 411, its upper end is connected to the glue inlet channel 431, and its lower end passes through the bottom surface of the main body section 43. When the valve needle drive structure is installed, the rubber inlet channel 431 communicates with the feed pipe 72 of the flow channel plate 7. The molding material enters the valve needle transition sleeve 4 from the rubber inlet channel 431 and then flows into the rubber outlet channel 412. During the flow of the molding material in the rubber outlet channel 412, some of the molding material will overflow upward from the gap between the valve needle transition hole 411 and the valve needle 3, and be discharged through the overflow and rubber discharge hole 44 provided in the connecting and positioning section 42, thereby preventing the molding material from overflowing to the top of the connecting and positioning section 42 and entering the piston cavity 11. In addition, the upper bearing surface of the valve needle transition sleeve 4 of this embodiment is arranged only against the cylinder body 1, not against the driver plate 6, thereby ensuring the sealing of the valve needle transition sleeve 4 to the cylinder body 1.

[0028] In this embodiment, the cylinder body 1 is provided with a needle-sealing air hole 12, which is located at the center of the top surface of the cylinder body 1 and penetrates the top wall of the cylinder body 1, communicating with the piston chamber. The cylinder body 1 is provided with a plurality of needle-opening air holes 13, which are arranged sequentially along the circumference of the cylinder body 1. The needle-opening air holes 13 include a first vent segment 131 and a second vent segment 132. The first vent segment 131 extends from the top surface of the cylinder body 1 along the side wall of the cylinder body 1. One end of the second vent segment 132 is connected to the first vent segment 131, and the other end is connected to the inner wall of the cylinder body 1 and communicates with the piston chamber 11.

[0029] In this embodiment, a ventilation annular groove 15 is provided on the top surface of the cylinder body 1 , and the first ventilation section 131 is connected to the ventilation annular groove 15 .

[0030] In this embodiment, a cylinder sealing ring groove 14 is provided on the top surface of the cylinder body 1 between the needle sealing hole 12 and the needle opening hole 13, and the outer peripheral surface of the piston 2 slides against the inner wall of the cylinder body 1, and the outer peripheral surface of the piston 2 is provided with a piston sealing ring groove; a piston sealing ring 5 is installed in the piston sealing ring groove, which effectively separates the needle sealing chamber 111 from the needle opening chamber 112, ensuring the airtightness of the needle sealing chamber 111 and the needle opening chamber 112.

[0031] Based on a valve needle drive structure disclosed in this embodiment, this embodiment also discloses a hot runner system, including a driver plate 6, a runner plate 7, a nozzle plate 8 and the above-mentioned valve needle drive structure; the driver plate 6 has a driver mounting position 61 passing through its bottom surface, the cylinder body 1 is arranged in the driver mounting position 61, and the top surface of the cylinder body 1 is against the driver plate 6; the driver plate 6 has a sealing needle air duct 62 and an opening needle air duct 63 inside, the sealing needle air duct 62 is connected to the sealing needle air hole 12 in a one-to-one correspondence, and the opening needle air duct 63 is connected to the opening needle air hole 13 in a one-to-one correspondence. Specifically, there is one sealing needle air duct 62 and multiple opening needle air ducts 63. The gas in the sealing needle air duct 62 enters the sealing needle chamber 111 through the sealing needle air hole 12, and the gas in multiple opening needle air ducts 63 enters the opening needle chamber 112 through multiple opening needle air holes 13, thereby applying pressurized gas to the sealing needle chamber 111 and the opening needle chamber 112, and the piston 2 moves based on the changes in air pressure in the sealing needle chamber 111 and the opening needle chamber 112.

[0032] In this embodiment, a cylinder sealing ring is installed in the cylinder sealing ring groove 14, which effectively separates the needle sealing air duct 62 and the needle sealing air hole 12 from the needle opening air channel and the needle opening air hole 13, respectively, to ensure air tightness.

[0033] In this embodiment, the flow channel plate 7 has a transition sleeve mounting hole 71 extending downward from the top surface of the flow channel plate 7 and adapted to fit within the main body section 43. The lower support surface of the connecting positioning section 42 is positioned against the top surface of the flow channel plate 7, and the main body section 43 is disposed within the transition sleeve mounting hole 71. The flow channel plate 7 has a feed pipe 72 and a discharge pipe 73. The feed pipe 72 communicates with the rubber inlet passage 431 of the main body section 43. The discharge pipe 73 is located at the lower end of the transition sleeve mounting hole 71, coaxially connected to the rubber outlet passage 412 of the main body section 43, and extends to the bottom surface of the flow channel plate 7. The main body section 43 of the valve needle transition sleeve 4 not only insulates the molding material but also transfers the molding material.

[0034] In this embodiment, the nozzle plate 8 has a nozzle mounting hole 81, within which a nozzle structure 9 is mounted. The nozzle structure 9 includes a nozzle hole 91. The lower end of the discharge pipe 73 is connected to the nozzle hole 91. The nozzle plate 8 has a glue discharge pipe 82, which is connected to the overflow glue discharge hole 44 of the connection positioning section 42. The lower end of the valve needle 3 sequentially passes through the valve needle transition position 41, the discharge pipe 73, and the nozzle hole 91. The hot runner system also includes a glue inlet structure 10, which is connected to the feed pipe 72. The injected molten material enters through the glue inlet of the glue inlet structure 10 and is diverted to the feed pipe 72 of the runner plate 7.

[0035] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the scope of protection of the present invention.

Claims

1. A valve needle drive structure, characterized in that: The valve needle is connected to the bottom of the cylinder body and seals the piston cavity. The piston is installed in the piston cavity so as to be movable up and down and divides the piston cavity into a sealing needle cavity and an opening needle cavity. The cylinder body is respectively provided with a sealing needle air hole connected to the sealing needle cavity and an opening needle air hole connected to the opening needle cavity. The upper end of the valve needle is connected to the piston. The interior of the valve needle bushing has a valve needle transition position passing through the axis. The valve needle can move up and down along the valve needle transition position and its lower end passes through the valve needle transition position.

2. A valve needle drive structure according to claim 1, characterized in that: The valve needle transition sleeve includes a connecting positioning section and a main body section which are sequentially arranged along the axis from top to bottom. The connecting positioning section is connected to the bottom of the cylinder body and seals the piston chamber. The valve needle transition position includes a valve needle transition hole and a glue outlet channel which are sequentially arranged along the axis from top to bottom. The outer wall of the main body section is provided with a glue inlet channel which extends inward and is connected to the glue outlet channel.

3. The valve needle drive structure according to claim 2, characterized in that: The connecting and positioning section has an overflow and glue discharge hole which runs through the left and right sides and is connected with the valve needle transition hole.

4. The valve needle drive structure according to claim 1, characterized in that: The sealing needle air hole is provided on the top surface of the cylinder body and penetrates the top wall of the cylinder body; The needle-opening air hole includes a first ventilation section and a second ventilation section. The first ventilation section extends from the top surface of the cylinder body and along the side wall of the cylinder body outside the piston cavity. One end of the second ventilation section is connected to the first ventilation section, and the other end passes through the side wall of the cylinder body and is connected to the piston cavity.

5. The valve needle drive structure according to claim 4, characterized in that: There is one sealing needle air hole, which is located at the center of the top surface of the cylinder body; There are multiple needle opening holes, which are arranged in sequence along the circumference of the cylinder body.

6. A valve needle drive structure according to any one of claims 4 or 5, characterized in that: A ventilation ring groove is provided on the top surface of the cylinder body, and the first ventilation section is connected to the ventilation ring groove.

7. The valve needle drive structure according to claim 1, characterized in that: The top surface of the cylinder body is provided with a cylinder body sealing ring groove between the sealing needle air hole and the opening needle air hole; the outer peripheral surface of the piston is slidably matched with the inner wall of the piston cavity, the outer peripheral surface of the piston is provided with a piston sealing ring groove, and a piston sealing ring is installed in the piston sealing ring groove.

8. A hot runner system, characterized in that: It comprises a driver plate and a valve needle driving structure according to any one of claims 1 to 7; The bottom surface of the driver plate has a driver mounting position, and the cylinder body is arranged in the driver mounting position; The driver plate is provided with a needle sealing air duct communicated with the needle sealing air hole and a needle opening air duct communicated with the needle opening air hole.

9. The hot runner system according to claim 8, characterized in that: Also includes a runner plate; The top surface of the flow channel plate is provided with a transition sleeve mounting hole, the main body section of the valve needle transition sleeve is arranged in the transition sleeve mounting hole, and the connection positioning section of the valve needle transition sleeve is arranged against the top surface of the flow channel plate; the interior of the flow channel plate is provided with a feed pipe and a discharge pipe, the feed pipe is connected with the rubber inlet channel of the main body section, and the discharge pipe is located at the lower end of the transition sleeve mounting hole, is coaxially connected with the rubber outlet channel of the main body section and extends to the bottom surface of the flow channel plate.

10. The hot runner system according to claim 9, characterized in that: It also includes a nozzle plate and a glue inlet structure; The nozzle plate has a nozzle mounting hole, a nozzle structure is mounted in the nozzle mounting hole, the nozzle structure includes a nozzle hole connected to the discharge pipe, and the lower end of the valve needle passes through the valve needle transition position, the discharge pipe and the nozzle hole in sequence; The nozzle plate has a glue discharge pipe, which is connected to the overflow glue discharge hole of the connecting positioning section; the glue feeding structure is connected to the feeding pipe.

Images