WO2018098605A1 - 工程塑料类重复使用型热流道系统 - Google Patents

工程塑料类重复使用型热流道系统 Download PDF

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Publication number
WO2018098605A1
WO2018098605A1 PCT/CN2016/000667 CN2016000667W WO2018098605A1 WO 2018098605 A1 WO2018098605 A1 WO 2018098605A1 CN 2016000667 W CN2016000667 W CN 2016000667W WO 2018098605 A1 WO2018098605 A1 WO 2018098605A1
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WO
WIPO (PCT)
Prior art keywords
core
hole
sleeve
hot
valve needle
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PCT/CN2016/000667
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English (en)
French (fr)
Inventor
沈坚
严杰
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苏州好特斯模具有限公司
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Priority to PCT/CN2016/000667 priority Critical patent/WO2018098605A1/zh
Publication of WO2018098605A1 publication Critical patent/WO2018098605A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/70—Means for plasticising or homogenising the moulding material or forcing it into the mould, combined with mould opening, closing or clamping devices

Definitions

  • the present invention relates to the field of hot runner systems, and more particularly to an engineering plastic reusable hot runner system.
  • the structure of the hot runner system in the prior art consists of a cylinder, a valve needle, a pressure bearing block, a splitter plate, a flow guiding plug, a guiding sleeve, a hot nozzle body, a hot mouth bushing, a hot mouth hanging block, a heat conducting core
  • the core fixing cover is composed of engineering plastics and fiber-added plastics, which have poor fluidity, strong corrosiveness and high molding pressure.
  • the existing structure mainly has the following disadvantages: 1.
  • the heat-conducting core adopts a single material, and the hardness and wear resistance are poor.
  • the heat treatment body is not required to ensure the bending deformation property during thermal expansion. High, the flow channel hole of the main body is easy to corrode, the flow resistance becomes large, and the plastic is easily retained in the flow channel hole, causing flow lines or spots on the product; 3.
  • the hot mouth hanging table cooperates with the mold, and the heat loss of the hot mouth is large. The temperature of the hot nozzle becomes lower, the flowability of the plastic becomes worse, and the product is prone to the problem of lack of glue. 4.
  • the diversion sleeve has a small rubber hole and a large number of plastic pores, which affects the fluidity of the plasticized plastic.
  • the plastic flow rate is slow, and the product is easy to produce.
  • Weld Line 5 the diversion plug and the diversion sleeve have a small area, which is easy to seep or leak; 6.
  • the pressure pad has no valve needle positioning structure. When the beveled product requires valve needle positioning, the valve needle cannot be positioned. .
  • the technical problem mainly solved by the invention is to provide a reusable hot runner system for engineering plastics, which has excellent sealing effect and no plastic leakage; the flow passage hole is large, the plastic has good fluidity and the molding pressure is small, and the product quality can be ensured;
  • the main body of the hot nozzle and the flow channel plate are connected by screws, the sealing performance is good, and the glue is not easy to leak;
  • the main body of the hot nozzle is not matched with the mold, no heat damage, the temperature of the hot nozzle is high, the flow property of the plastic is good, the molding pressure is small, and the product is full and bright;
  • the valve needle guide sleeve, the thermal conductive copper sleeve and the flow channel sleeve adopt a replaceable knot
  • the structure is simple to replace, convenient to maintain, and low in use cost; when the thermal conductive core is thermally expanded, the heat insulating cap blocks between the heat conducting core and the mold, and the heat loss of the heat conducting core is small.
  • a technical solution adopted by the present invention is to provide an engineering plastic reusable hot runner system, including a cylinder, a valve needle, a flow channel plate, a flow guiding sleeve, a hot nozzle body, a core and a core.
  • the flow channel plate has a radial flow channel hole and a horizontal flow channel hole, the radial flow channel hole and the horizontal flow channel hole are L-shaped, and the radial flow channel hole communicates with the horizontal flow channel hole, the diameter a transitional fillet is provided at the joint of the flow passage hole and the horizontal flow passage hole;
  • the guide sleeve is embedded in the position of the radial flow passage hole and the horizontal flow passage hole in the flow passage plate;
  • the core is fixed by the core fixing cover
  • One end of the valve needle is fixedly connected with the piston rod of the cylinder, and the other end of the valve needle passes through the horizontal flow passage hole and extends into the flow passage of the hot nozzle body;
  • the flow passage plate has a hot nozzle mounting hole on one side thereof.
  • the hot nozzle mounting hole is connected to the horizontal flow channel hole, the hot nozzle mounting hole is in line with the axis of the horizontal flow channel hole; the hot nozzle body is installed at one end in the hot nozzle mounting hole; the core includes a heat conductive core , core protector, valve guide sleeve and insulated cap; corresponding to the other end of the hot nozzle mounting hole;
  • the end of the hot runner main flow channel is provided with a core mounting hole, the heat conducting core is disposed in the core mounting hole, and the front end of the heat conducting core protrudes from the core mounting hole, and the outer wall of the rear end of the heat conducting core is provided with a core a sub-mounting table, the core protection sleeve is sleeved on the outer wall of the heat-conducting core at the core hanging platform, and the core protective sleeve is in contact with the core mounting hole; the inner hole of the front end of the heat-conducting core has a guiding sleeve mounting groove therein The
  • the hot nozzle mounting hole has a two-stage type, and the diameter of the outer section of the hot nozzle mounting hole is larger than the diameter of the inner section, and the diameter of the inner section of the hot nozzle mounting hole is larger than the diameter of the horizontal flow channel hole, and the hot nozzle mounting hole
  • the hot nozzle mounting hole of the outer section is provided with a hot nozzle mounting internal thread;
  • the outer wall of one end of the hot nozzle body is provided with a hot nozzle mounting external thread matched with the internal thread of the hot nozzle, and the hot nozzle body is installed through the hot nozzle
  • the screw thread and the hot nozzle are connected with the external thread to be screwed into the flow channel plate;
  • the heat pipe body has a heat conductive copper sleeve embedded therein, the heat conductive copper sleeve has a flow channel sleeve embedded therein, and both ends of the heat conductive copper sleeve and the flow channel sleeve are Abutting on an end surface of a section of the
  • the position of the corresponding guide sleeve on the flow channel plate is provided with a positioning upper block, a positioning pin and a fixing nut; the flow path plate is corresponding to the horizontal flow path hole corresponding to the other side of the hot nozzle body.
  • the guiding sleeve mounting hole of the guiding sleeve is coaxial with the horizontal flow channel hole, and the guiding hole of the guiding sleeve is three-stage, and the diameter of the guiding sleeve mounting hole from the outside of the flow channel to the inner three sections is gradually reduced.
  • the flow sleeve is embedded in the flow channel plate at a position where the radial flow channel hole and the horizontal flow channel hole are in contact with each other, and the circular flow port is opened at one end of the flow guiding sleeve embedded in the radial flow channel hole and the horizontal flow channel hole a guide sleeve hole is arranged at the axis of the guide sleeve, and the guide sleeve hole is connected with the radial flow passage hole and the horizontal flow passage hole; the middle portion of the drainage sleeve is provided with a guide sleeve hanging platform, and the guide sleeve is extended at one end In the innermost section of the inlet sleeve of the flow guiding sleeve, the guiding sleeve hanging platform abuts against the end surface of the middle section of the guiding sleeve mounting hole, and the inner wall of the outermost section of the guiding sleeve mounting hole is provided with a nut to install the internal
  • the center of the positioning upper block has a valve pin through hole with a flat position;
  • the valve needle has a cylindrical shape.
  • the rear end of the valve needle is provided with a flat position, one end of the valve needle is fixedly connected with the piston rod of the cylinder, and the other end of the valve needle passes through the positioning upper block, the fixed nut, the guide sleeve, the horizontal flow passage hole and the hot nozzle body
  • the flat position on the valve needle cooperates with the valve needle through hole of the positioning block, and the guiding sleeve of the guiding sleeve cooperates with the circular section of the valve needle to seal the outer diameter and the flow path of the guiding sleeve.
  • the board is matched with the sealant.
  • the outer wall of the hot nozzle body is covered with a heating sleeve, and the heating sleeve is fixed by the clamp.
  • the core fixing cover is provided with a flange on a section outside the main body of the hot nozzle, and the outer end of the main body of the hot nozzle is provided with a card slot at a position corresponding to the core fixing cover, and the card slot is provided with an outer buckle.
  • the heat-conducting core is processed into a semi-finished product of a heat-conducting core by a TZM alloy bar, and the inner hole of the semi-finished core of the heat-conducting core is finished in position, and a portion of the heat-conducting core and the nozzle body are sealed, and the heat-conductive core is left.
  • the semi-finished product is subjected to high-temperature thermal spraying of nano-ceramics with a thickness of 5-10 micrometers. After the coating is processed, the end faces of the heat-conducting core and the hot-mouth body are processed to complete the processing of the heat-conducting core.
  • the guiding sleeve mounting groove has a two-stage type, and a diameter of a section near the end surface of the heat conducting core is larger than a diameter of the other section, and the valve needle guiding sleeve is embedded in a section of the guiding sleeve mounting groove having a small diameter, the valve needle guiding sleeve and the guiding sleeve
  • the length of the mounting groove near the end face of the heat conducting core forms a welding gap, and the valve pin guiding sleeve is welded with the heat conducting core by a silver ion welding technique using a HYAg silver electrode.
  • the invention has the beneficial effects that the guide sleeve of the invention adopts a semi-embedded structure, the drainage sleeve has excellent sealing effect and no plastic leakage problem; the lower end surface of the diversion sleeve and the flow passage hole form a circular arc transition, and the flow passage hole is large, plastic Good fluidity, low molding pressure and good product quality;
  • Positioning the upper end surface of the upper block has a valve pin through hole with a flat position, which is matched with the valve needle with the flat position. After the valve needle is positioned, the valve needle head can be processed into the shape required by the product, and the valve needle cannot be solved. Positioning, valve needle rotation, product traces are too deep;
  • the main body of the hot nozzle is not matched with the mold, no heat damage, high temperature of the hot nozzle, good flowability of the plastic, small molding pressure, full and bright product; the main body of the hot nozzle and the flow channel plate are connected by screws, and the sealing performance is good, Easy to leak glue;
  • valve needle guide sleeve When the valve needle guide sleeve is worn, the silver solder joint can be melted by heating the heat conductive core to 650 ° C, and the worn valve needle guide sleeve can be replaced by a new one, which can effectively reduce the use cost;
  • the shape of the heat-insulating cap is 50-60°, which is consistent with the heat-conducting core. It does not need special processing for the mold. It is easy to use and replace, and it is not easy to loose.
  • the heat-conducting core is preferably made of high-precision equipment.
  • the thermal conductivity of the thermal conductive core is more than three times that of the conventional carbon steel core; the core protective sleeve is processed by high-temperature steel after heat treatment, and the hardness is 50% higher than that of the thermal conductive core, ensuring high hardness of the thermal core hanging platform.
  • the valve needle guide sleeve is preferably YT-type tungsten steel alloy, which has high hardness and wear resistance, and the tungsten steel sleeve is matched with the valve needle for a long time.
  • the friction is not easy to wear; the life of the core is increased by more than 3 times; the insulating cap is made of polyimide, and its physical properties are maintained at a high temperature of 400 degrees. The heat insulation effect is good, and the thermal insulation core is thermally expanded.
  • the temperature of the heat-conducting core is not lowered, and the heat loss of the core head is caused by the excessive heat loss when the heat-conducting core directly touches the mold, which causes the plastic to be out of rubber and affects the molding of the product;
  • the thermal conductive copper sleeve increases the heat conduction performance of the main body, the heat transfer speed is fast, the heat in the flow channel is uniform, the thermal efficiency is high, the plastic flow performance is good, and the glue is smooth;
  • the flow channel sleeve is preferably a YT-type tungsten steel alloy, and the heat treatment hardness reaches HRC60 or more, and the hot nozzle body
  • the runner has high hardness, wear resistance and corrosion resistance; the heat conductive copper sleeve and the flow passage sleeve adopt a replaceable structure. After the flow passage sleeve is worn, the fixed parts of the two ends are disassembled, which can be replaced, the maintenance is convenient, the use cost is low, and the length is extended.
  • the service life of the hot mouth is energy saving and environmentally friendly.
  • FIG. 1 is a cross-sectional structural view showing a preferred embodiment of the engineering plastic reusable hot runner system of the present invention
  • FIG. 2 is a schematic perspective view showing the positioning of the upper block in the engineering plastic reusable hot runner system
  • FIG. 3 is a schematic perspective view showing the valve needle of the engineering plastic reusable hot runner system
  • Figure 4 is a cross-sectional perspective view showing the core of the engineering plastic reusable hot runner system
  • an embodiment of the present invention includes:
  • An engineering plastic reusable hot runner system comprising a cylinder 1, a valve needle 2, a flow channel plate 3, a flow guiding sleeve 4, a positioning upper block 5, a positioning pin 6, a fixing nut 7, a hot nozzle body 8, a core, a core fixing cover 13, a heating sleeve 14, a clamp 15, an outer card 16, a heat conducting copper sleeve 17, and a flow passage sleeve 18;
  • the flow passage plate 3 is provided with a radial flow passage hole and a horizontal flow passage hole
  • the radial flow passage hole and the horizontal flow passage hole are L-shaped, the radial flow passage hole is in communication with the horizontal flow passage hole, and the radial flow passage hole and the horizontal flow passage hole are provided with excessive rounding;
  • the flow The position of the channel plate 3 facing away from the horizontal flow channel hole is provided with a guiding sleeve mounting hole communicating with the horizontal flow channel hole and coaxially, and the guiding sleeve mounting hole is in three
  • the diameter of the three-section diversion sleeve mounting hole is gradually reduced, and the diversion sleeve 4 is embedded in the flow path plate 3 at a position where the radial flow path hole and the horizontal flow path hole are in contact with each other, and the radial flow path hole and the horizontal surface are embedded.
  • a guide hole is formed on one end of the guide sleeve 4 at the position where the flow passage hole is connected, and a guide sleeve hanger is arranged at the middle of the guide sleeve 4, and one end of the guide sleeve 4 extends into the innermost portion of the guide sleeve installation hole.
  • Guide Sleeve mounting table guide sleeve against the end face of the mounting hole of the middle section, the outermost section of the guide sleeve provided with an internal wall of the mounting hole of the mounting screw nut; nut 7 fixed to the two-stage form, an outer wall section is provided There is a nut for the internal thread of the nut to be fitted with the external thread of the nut, and the other part is a hexagonal boss.
  • the fixing nut 7 with a nut and a portion of the external thread is provided with a hole matching the guide sleeve 4 at the center, and is fixed.
  • the nut 7 is screwed into the guiding sleeve mounting hole and pressed against the guiding sleeve 4, and the hexagonal boss protrudes from the flow channel plate 3; the positioning upper block 5 is fixed on the outer wall of the flow channel plate 3 by the positioning pin 6.
  • the positioning upper block 5 is pressed on the hexagonal boss, and the center of the upper block 5 is opened with a valve needle through hole with a flat position; the valve needle is provided with a flat position, and one end of the valve needle 2 is fixedly connected with the piston rod of the cylinder 1, The other end of the valve needle 2 passes through the positioning upper block 5, the fixed nut 7, the guide sleeve 4, the horizontal flow passage hole and extends into the flow passage of the hot nozzle body 8, the flat position on the valve needle 2 and the positioning spacer
  • the valve pin with a flat position is matched with the through hole; the guide sleeve 4 adopts a semi-embedded structure, and the middle round hole of the guide sleeve 4 is matched with the circular section of the valve needle to seal the rubber, and the outer diameter of the guide sleeve 4 and the flow path plate 3 cooperate with the sealing glue, the outer circumference of the fixing nut 7 is matched with the positioning upper block 5, and the positioning upper block 5 is matched with the flow channel
  • the flow sleeve 4 and the fixed nut 7 will not loosen, the upper spacer will not rotate, the sealing effect is excellent, and there is no plastic leakage problem; the lower end surface of the guide sleeve 4 and the flow passage hole have a circular arc transition, and the flow passage hole is large, plastic Good fluidity, low molding pressure and good product quality.
  • the positioning upper block 5 is mounted on the hexagonal boss of the fixing nut 7, and the lower end surface of the positioning upper block 5 is pressed on the end surface of the fixing nut 7 which is provided with a threaded external portion of the nut, and the center of the upper end surface of the upper block 5 is positioned.
  • There is a valve needle through hole with flat position which is matched with the valve needle with flat position. After the valve needle is positioned, the valve needle head can be processed into the shape required by the product, which solves the problem that the valve needle cannot be positioned and the valve needle rotates. The problem is too deep.
  • a nozzle mounting hole is formed on the flow channel plate 3 at a position opposite to the other side of the guide sleeve mounting hole, the hot nozzle mounting hole is connected to the horizontal flow channel hole, and the hot nozzle mounting hole is coaxial with the horizontal flow channel hole.
  • the hot nozzle mounting hole is in two stages, the outer section of the hot nozzle mounting hole has a larger diameter than the inner section, the inner section has a larger diameter than the horizontal channel hole, and the outer section of the hot nozzle mounting hole has a hot nozzle for mounting the internal thread;
  • the core is fixed to one end of the hot nozzle main body 8 through the core fixing cover 13, and the outer wall of the other end of the hot nozzle main body 8 is provided with a hot nozzle mounting external thread matched with the internal thread of the hot nozzle mounting, and the hot nozzle main body 8 is screwed into the flow.
  • hot nozzle body 8 Does not cooperate with the mold, no heat damage, high temperature of the hot nozzle, good plastic flow performance, small molding pressure, full and bright product; hot nozzle body 8 and flow channel plate 3 are connected by thread, good sealing performance, not easy to leak glue; heating The sleeve 14 is mounted on the outer wall of the nozzle body 8 by the clamp 15;
  • the core is composed of a heat conductive core 9, a core protector 10, a valve needle guide sleeve 11, and a heat insulating cap 12.
  • the heat pipe body 8 has a core mounting hole at one end of the flow path, and the heat conductive core 9 is disposed at the core.
  • the sub-mounting hole is disposed, and the heat-conducting core 9 protrudes from the core mounting hole; the outer wall of the rear end of the heat-conducting core 9 is provided with a core hanging platform, and the core protective sleeve 10 is disposed at the core-hanging stage of the heat-conducting core 9
  • On the outer wall a guide sleeve mounting groove is formed in the inner hole of the front end of the heat conductive core 9.
  • the guide sleeve mounting groove has a two-stage type, and a diameter of a section near the end face of the heat conductive core 9 is larger than the diameter of the other section, and the valve needle guide sleeve 11 is embedded and guided.
  • the valve needle guiding sleeve 11 is in contact with a section inside the guiding sleeve mounting groove, and the valve needle guiding sleeve 11 and the guiding sleeve mounting groove are adjacent to a length of the end surface of the heat conducting core 9 to form a welding gap 19, and the valve needle guiding sleeve 11 passes HYAg silver ion welding technology is used for welding.
  • the silver solder joint can be melted by heating the heat conductive core 9 to 650 ° C, and the worn valve needle guide sleeve 11 can be replaced with a new one.
  • the core mounting hole is close A fixed cover is mounted on the end surface of the mouth main body 8 to mount the internal thread, the core fixing cover 13 is threadedly mounted in the core mounting hole, and the core fixing cover 13 is sleeved on the outer wall of the heat conductive core 9; the heat insulating cap 12 It adopts a 3-8° inverted taper structure to connect with the front end of the heat conductive core 9.
  • the heat shield 12 has a shape taper of 50-60°, which is consistent with the heat conductive core 9. No special processing is required for the mold, and it is convenient to use and replace. It is easy to loosen; the thermal conductive core is first processed into a semi-finished product of the thermal conductive core by the TZM alloy bar, the inner hole of the semi-finished core of the thermal conductive core is finished in place, and the remaining portion of the heat-conducting core and the hot-mouth main body are sealed, and the semi-finished product of the thermal conductive core
  • the high-temperature thermal spraying nano-ceramic is 5-10 micrometers thick, and the end face of the heat-conducting core and the hot-mouth body is processed after the coating is processed to complete the processing of the heat-conducting core; the thermal conductivity of the heat-conducting core 9 is a conventional carbon steel core.
  • the core protective sleeve 10 is processed by high-temperature steel after heat treatment, and the hardness is 50% higher than that of the heat-conducting core, ensuring high hardness of the heat-conducting core hanging platform, good strength, no deformation, and avoiding When the thermal conductive core is deformed, the hot runner system leaks;
  • the valve guide sleeve 11 is preferably a YT-type tungsten steel alloy, which has high hardness and wear resistance, and the tungsten steel sleeve is not easily worn by long-term friction with the valve needle;
  • the life span is increased by more than 3 times;
  • the heat insulating cap 12 is made of polyimide, and maintains its physical properties at a high temperature of 400 degrees, and the heat insulation effect is good.
  • the heat insulating cap 12 When the heat conductive core is thermally expanded, the heat insulating cap 12 is in contact with the mold, and the heat conduction is performed. The core temperature will not be reduced, and the heat loss of the core head will be low due to the excessive heat loss when the heat conductive core directly touches the mold, which causes the plastic to be out of rubber and affects the molding of the product.
  • the core fixing cover 13 is provided with a flange on a portion outside the hot nozzle main body 8.
  • the outer end of the hot nozzle main body 8 is provided with a card slot at a position corresponding to the core fixing cover 13, and the outer card 16 is provided with a card slot;
  • the thermal conductive copper sleeve 17 is embedded in the flow path of the hot-mouth body 8,
  • the flow channel sleeve 18 is disposed in the heat-conductive copper sleeve 17, and the two ends of the heat-conductive copper sleeve 17 and the flow-path sleeve 18 respectively abut the end surface of the hot-nozzle mounting hole and the heat-conducting core
  • the thermal conductive copper sleeve 17 increases the heat conduction performance of the main body, the heat transfer speed is fast, the heat in the flow channel is uniform, the thermal efficiency is high, the plastic flow performance is good, and the glue is smooth;
  • the flow path sleeve 18 is

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

一种工程塑料类重复使用型热流道系统，包括流道板(3)、热嘴主体(8)、芯子；流道板(3)上开有径向流道孔和水平流道孔；流道板(3)一侧开有热嘴安装孔；热嘴主体(8)一端安装在热嘴安装孔内；芯子包括导热芯子(9)、阀针导向套(11)和隔热帽(12)；热嘴主体流道的端部开有芯子安装孔，导热芯子(9)设在芯子安装孔内；导热芯子(9)前端的内孔中开有导向套安装槽，阀针导向套(11)通过银离子焊接技术焊接在导向套安装槽内；隔热帽(12)采用3-8°的倒锥扣结构与导热芯子(9)的前端连接；导热芯子(9)由TZM合金类棒材加工而成；隔热帽(12)采用聚酰亚胺制成。该装置密封效果优良，无塑料渗漏，导热芯子(9)热膨胀时，隔热帽(12)阻挡在导热芯子(9)和模具之间，导热芯子(9)热量损失小。

Description

工程塑料类重复使用型热流道系统 技术领域
本发明涉及热流道系统领域，特别是涉及一种工程塑料类重复使用型热流道系统。
背景技术
现有技术中热流道系统结构由气缸、阀针、承压垫块、分流板、导流塞、导流套、热嘴主体、热嘴衬套、热嘴挂台垫块、导热芯子、芯子固定盖组成，由于工程塑料、加纤塑料流动性差，腐蚀性强，成型压力大，现有结构主要有以下缺点：1、导热芯子采用单一材料，硬度和耐磨损性能较差，与阀针长期摩擦后，容易磨损或是开裂，造成模具浇口磨损，浇口变大，产品胶口处产生毛边；2、热嘴主体为了保证其在热膨胀时的弯曲变形性能，热处理硬度不高，主体的流道孔容易腐蚀，流动阻力变大，塑料容易滞留在流道孔内，造成产品上有流纹或是斑点；3、热嘴挂台与模具配合，热嘴热量损失大，热嘴温度变低，塑料流动性能变差，产品容易产生缺胶问题；4、导流套过胶孔小，过胶孔数量多，影响加纤塑料的流动性，塑料流速慢，产品容易产生熔接痕等问题；5、导流塞与导流套配合面积小，容易渗胶或是漏胶；6、承压垫块没有阀针定位结构，斜面进胶产品需要阀针定位时，阀针无法定位。
发明内容
本发明主要解决的技术问题是提供一种工程塑料类重复使用型热流道系统，密封效果优良，无塑料渗漏；流道孔较大，塑料流动性好，成型压力小，能够保证产品质量；热嘴主体与流道板通过螺纹连接，密封性能好，不容易漏胶；热嘴主体不与模具配合，无热量损害，热嘴温度高，塑料流动性能好，成型压力小，产品饱满光亮；阀针导向套、导热铜套、流道套采用可以更换的结 构，更换简单，维护方便，使用成本低；导热芯子热膨胀时，隔热帽阻挡在导热芯子和模具之间，导热芯子热量损失小。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种工程塑料类重复使用型热流道系统，包括气缸、阀针、流道板、导流套、热嘴主体、芯子和芯子固定盖；流道板上开有径向流道孔和水平流道孔，径向流道孔和水平流道孔呈L型相接，径向流道孔与水平流道孔相通，径向流道孔与水平流道孔接合处设有过渡圆角；导流套嵌入流道板中径向流道孔与水平流道孔的相接的位置；芯子通过芯子固定盖固定在热嘴主体上；阀针一端与气缸的活塞杆连接固定，阀针另一端穿过水平流道孔并伸入热嘴主体的流道内；所述流道板一侧开有热嘴安装孔，热嘴安装孔与水平流道孔相接，热嘴安装孔与水平流道孔的轴线在同一直线上；所述热嘴主体一端安装在热嘴安装孔内；所述芯子包括导热芯子、芯子保护套、阀针导向套和隔热帽；对应热嘴安装孔另一端的热嘴主体流道的端部开有芯子安装孔，导热芯子设在芯子安装孔内，且导热芯子前端伸出于芯子安装孔，导热芯子后端的外壁上设有芯子挂台，芯子保护套套在芯子挂台处的导热芯子外壁上，芯子保护套与芯子安装孔接触；所述导热芯子前端的内孔中开有导向套安装槽，所述阀针导向套嵌入导向套安装槽内，阀针导向套通过银离子焊接技术焊接在导向套安装槽内；所述芯子安装孔上靠近热嘴主体端面处设有一段固定盖安装螺纹，芯子固定盖通过固定盖安装螺纹安装在芯子安装孔内，芯子固定盖后端套住一部分导热芯子，芯子固定盖前端伸出于芯子安装孔；所述隔热帽为环形，且隔热帽外形锥度为50-60°，隔热帽采用3-8°的倒锥扣结构与导热芯子的前端连接；所述导热芯子由TZM合金类棒材加工而成；所述芯子保护套由高碳钢经过热处理工艺后加工成形；所述阀针导向套为YT类钨钢合金；所述隔热帽采用聚酰亚胺制成。
优选的，所述热嘴安装孔呈两段式，热嘴安装孔外侧一段的直径大于内侧一段的直径，热嘴安装孔内侧一段的直径大于所述水平流道孔的直径，热嘴安装孔外侧一段的热嘴安装孔内开有热嘴安装内螺纹；所述热嘴主体一端的外壁上开有与热嘴安装内螺纹相匹配的热嘴安装外螺纹，热嘴主体通过热嘴安装内螺纹和热嘴安装外螺纹的配合旋入流道板；所述热嘴主体的流道内嵌有导热铜套，导热铜套内嵌有流道套，导热铜套和流道套的两端均分别抵在所述热嘴安装孔内侧一段的端面和所述导热芯子后端的端面上，所述流道套为YT类钨钢合金，热处理硬度达到HRC60以上。
优选的，所述流道板上对应导流套的位置设有定位上垫块、定位销和固定螺帽；所述流道板对应热嘴主体另一侧的位置开有与水平流道孔相通且与水平流道孔同轴线的导流套安装孔，导流套安装孔呈三段式，从流道板外至内三段的导流套安装孔的直径逐级减小，导流套嵌入流道板中位于径向流道孔与水平流道孔的相接的位置，嵌入径向流道孔与水平流道孔相接位置的导流套一端上开有圆弧型口，导流套轴线处设有导流套孔，导流套孔与径向流道孔和水平流道孔相通；所述导流套中间段设有导流套挂台，导流套一端伸入导流套安装孔最内侧的一段内，导流套挂台抵在导流套安装孔中间一段的端面上，导流套安装孔最外一段的内壁上设有螺帽安装内螺纹；所述固定螺帽呈两段式，一段外壁设有与导流套安装孔内螺纹相匹配的螺帽安装外螺纹，另一段为六角凸台，设有螺帽安装外螺纹一段的固定螺帽中心开有与导流套相匹配的孔，固定螺帽通过螺帽安装内螺纹与螺帽安装外螺纹的配合旋入导流套安装孔内且压住导流套，六角凸台伸出流道板；所述定位上垫块通过定位销固定在流道板外壁上，定位上垫块压在六角凸台上。
优选的，所述定位上垫块中心开有带扁位的阀针过孔；所述阀针呈圆柱形， 阀针后端的位置设有扁位，阀针一端与气缸的活塞杆连接固定，阀针另一端穿过定位上垫块、固定螺帽、导流套、水平流道孔并伸入热嘴主体的流道内，阀针上的扁位与定位上垫块的阀针过孔相配合，导流套的导流套孔与阀针的圆形段配合封胶，导流套外径与流道板配合封胶。
优选的，所述热嘴主体外壁上套有加热套，加热套通过卡箍固定。
优选的，芯子固定盖位于热嘴主体外的一段上设有凸缘，热嘴主体外端对应芯子固定盖的位置设有卡槽，卡槽内设有外卡扣。
优选的，所述导热芯子由TZM合金类棒材先加工成导热芯子半成品，导热芯子半成品内孔精加工到位，导热芯子与热嘴主体配合密封的部位留余量，导热芯子半成品进行高温热喷涂纳米陶瓷，厚度为5-10微米，涂层处理完后加工导热芯子与热嘴主体配合的端面，完成导热芯子加工。
优选的，所述导向套安装槽呈两段式，靠近导热芯子端面的一段直径大于另一段的直径，阀针导向套嵌入导向套安装槽内直径小的一段，阀针导向套与导向套安装槽靠近导热芯子端面的一段直径形成焊接间隙，阀针导向套通过银离子焊接技术采用HYAg银焊条与导热芯子进行焊接。
本发明的有益效果是：本发明导流套采用半嵌入结构，导流套密封效果优良，无塑料渗漏问题；导流套下端面与流道孔成圆弧形过渡，流道孔较大，塑料流动性好，成型压力小，产品质量佳；
定位上垫块上端面中心有一个带扁位的阀针过孔，与带扁位的阀针进行配合定位，阀针定位后，阀针头部可以加工成产品需要的形状，解决了阀针不能定位，阀针旋转，产品痕迹过深的问题；
热嘴主体不与模具配合，无热量损害，热嘴温度高，塑料流动性能好，成型压力小，产品饱满光亮；热嘴主体与流道板通过螺纹连接，密封性能好，不 容易漏胶；
当阀针导向套磨损后，只要把导热芯子加热到650℃时就可以熔化银焊点，把磨损的阀针导向套更换成新的就可以继续用，可以有效减少使用成本；
隔热帽外形锥度为50-60°，与导热芯子一致，无需对模具进行特别加工，使用更换方便，不容易松脱；导热芯子优选TZM合金类棒材经过高精密设备加工而成，导热芯子的热导率是常规碳钢芯子的3倍以上；芯子保护套由高碳钢经过热处理工艺后加工成形，硬度比导热芯子高50％，确保导热芯子挂台硬度高，强度好，不产生变形，避免导热芯子挂台变形时造成热流道系统漏胶；阀针导向套优选YT类钨钢合金，硬度高，耐磨损，钨钢套通过与阀针长期配合磨擦也不容易磨损；芯子寿命提高3倍以上；隔热帽采用聚酰亚胺制成，在400度的高温下仍然保持其物理特性，隔热效果好，导热芯子热膨胀时，隔热帽与模具接触，导热芯子温度不会降低，避免导热芯子直接碰触模具时热量损失过多导致芯子头部温度偏低，造成塑料出胶不顺，影响产品的成型；
导热铜套增加主体的热传导性能，热量传递速度快，流道内热量均匀，热效率高，塑料流动性能好，出胶顺畅；流道套优选YT类钨钢合金，热处理硬度达到HRC60以上，热嘴主体流道硬度高，耐磨损、耐腐蚀；导热铜套、流道套采用可以更换的结构，流道套磨损后，拆开两头的固定零件，即可更换，维护方便，使用成本低，延长了热嘴的使用寿命，节能环保。
附图说明
图1是本发明工程塑料类重复使用型热流道系统一较佳实施例的剖视结构示意图；
图2是所示工程塑料类重复使用型热流道系统中定位上垫块的立体结构示意图；
图3是所示工程塑料类重复使用型热流道系统中阀针的立体结构示意图；
图4是所示工程塑料类重复使用型热流道系统中芯子的剖视立体结构示意图；
附图中各部件的标记如下：1、气缸；2、阀针；3、流道板；4、导流套；5、定位上垫块；6、定位销；7、固定螺帽；8、热嘴主体；9、导热芯子；10、芯子保护套；11、阀针导向套；12、隔热帽；13、芯子固定盖；14、加热套；15、卡箍；16、外卡；17、导热铜套；18、流道套；19、焊接间隙。
具体实施方式
下面结合附图对本发明的较佳实施例进行详细阐述，以使本发明的优点和特征能更易于被本领域技术人员理解，从而对本发明的保护范围做出更为清楚明确的界定。
请参阅图1至图4，本发明实施例包括：
一种工程塑料类重复使用型热流道系统，包括气缸1、阀针2、流道板3、导流套4、定位上垫块5、定位销6、固定螺帽7、热嘴主体8、芯子、芯子固定盖13、加热套14、卡箍15、外卡16、导热铜套17和流道套18；所述流道板3上开有径向流道孔和水平流道孔，径向流道孔和水平流道孔呈L型相接，径向流道孔与水平流道孔相通，径向流道孔与水平流道孔接合处设有过度圆角；所述流道板3上背对着水平流道孔的位置开有与水平流道孔相通且同轴线的导流套安装孔，导流套安装孔呈三段式，从流道板3外至内三段的导流套安装孔的直径逐级减小，导流套4嵌入流道板3中位于径向流道孔与水平流道孔的相接的位置，嵌入径向流道孔与水平流道孔相接位置的导流套4一端上开有圆弧型口，导流套4中间处设有导流套挂台，导流套4一端伸入导流套安装孔最内侧的一段内，导流套挂台抵在导流套安装孔中间一段的端面上，最外一段的导流套安装孔内壁上设有螺帽安装内螺纹；所述固定螺帽7呈两段式，一段外壁设 有与螺帽安装内螺纹相匹配的螺帽安装外螺纹，另一段为六角凸台，设有螺帽安装外螺纹一段的固定螺帽7中心开有与导流套4相匹配的孔，固定螺帽7一段旋入导流套安装孔内且压住导流套4，六角凸台伸出流道板3；所述定位上垫块5通过定位销6固定在流道板3外壁上，定位上垫块5压在六角凸台上，定位上垫块5中心开有带扁位的阀针过孔；阀针上设有扁位，阀针2一端与气缸1的活塞杆连接固定，阀针2另一端穿过定位上垫块5、固定螺帽7、导流套4、水平流道孔并伸入热嘴主体8的流道内，阀针2上的扁位与定位上垫块5的带扁位的阀针过孔相配合；导流套4采用半嵌入结构，导流套4中间圆孔与阀针的圆形段配合封胶，导流套4外径与流道板3配合封胶，固定螺帽7外圆与定位上垫块5配合，定位上垫块5通过定位销6与流道板3配合定位，通过这种连环配合组装后，导流套4与固定螺帽7不会松动，上垫块不会旋转，密封效果优良，无塑料渗漏问题；导流套4下端面与流道孔成圆弧形过渡，流道孔较大，塑料流动性好，成型压力小，产品质量佳。定位上垫块5安装在固定螺帽7的六角凸台上，定位上垫块5下端面压在固定螺帽7设有螺帽安装外螺纹一段的端面上，定位上垫块5上端面中心有一个带扁位的阀针过孔，与带扁位的阀针进行配合定位，阀针定位后，阀针头部可以加工成产品需要的形状，解决了阀针不能定位，阀针旋转，产品痕迹过深的问题。
所述流道板3上相对于导流套安装孔另一侧的位置开有热嘴安装孔，热嘴安装孔与水平流道孔相接，热嘴安装孔与水平流道孔同轴线，热嘴安装孔呈两段式，热嘴安装孔外侧一段的直径大于内侧一段，内侧一段的直径大于水平流道孔的直径，外侧一段的热嘴安装孔内开有热嘴安装内螺纹；芯子通过芯子固定盖13固定在热嘴主体8一端，热嘴主体8另一端的外壁上开有与热嘴安装内螺纹相匹配的热嘴安装外螺纹，热嘴主体8通过螺纹旋入流道板3，热嘴主体8 不与模具配合，无热量损害，热嘴温度高，塑料流动性能好，成型压力小，产品饱满光亮；热嘴主体8与流道板3通过螺纹连接，密封性能好，不容易漏胶；加热套14通过卡箍15安装在热嘴主体8外壁上；
所述芯子由导热芯子9、芯子保护套10、阀针导向套11、隔热帽12组成；热嘴主体8的流道一端开有芯子安装孔，导热芯子9设在芯子安装孔内，且导热芯子9伸出于芯子安装孔；导热芯子9后端的外壁上设有芯子挂台，芯子保护套10套在芯子挂台处的导热芯子9外壁上，导热芯子9前端的内孔中开有导向套安装槽，导向套安装槽呈两段式，靠近导热芯子9端面的一段直径大于另一段的直径，阀针导向套11嵌入导向套安装槽内，阀针导向套11与导向套安装槽内部的一段接触，阀针导向套11与导向套安装槽靠近导热芯子9端面的一段直径形成焊接间隙19，阀针导向套11通过HYAg类银离子焊接技术进行焊接，当阀针导向套11磨损后，只要把导热芯子9加热到650℃时就可以熔化银焊点，把磨损的阀针导向套11更换成新的就可以继续用，可以有效减少使用成本；芯子安装孔上靠近热嘴主体8端面处设有一段固定盖安装内螺纹，芯子固定盖13通过螺纹安装在芯子安装孔内，且芯子固定盖13套在导热芯子9外壁上；所述隔热帽12采用3-8°的倒锥扣结构与导热芯子9的前端连接，隔热帽12外形锥度为50-60°，与导热芯子9一致，无需对模具进行特别加工，使用更换方便，不容易松脱；导热芯子由TZM合金类棒材先加工成导热芯子半成品，导热芯子半成品内孔精加工到位，导热芯子与热嘴主体配合密封的部位留余量，导热芯子半成品进行高温热喷涂纳米陶瓷，厚度为5-10微米，涂层处理完后加工导热芯子与热嘴主体配合的端面，完成导热芯子加工；导热芯子9的热导率是常规碳钢芯子的3倍以上；芯子保护套10由高碳钢经过热处理工艺后加工成形，硬度比导热芯子高50％，确保导热芯子挂台硬度高，强度好，不产生变形，避免 导热芯子挂台变形时造成热流道系统漏胶；阀针导向套11优选YT类钨钢合金，硬度高，耐磨损，钨钢套通过与阀针长期配合磨擦也不容易磨损；芯子寿命提高3倍以上；隔热帽12采用聚酰亚胺制成，在400度的高温下仍然保持其物理特性，隔热效果好，导热芯子热膨胀时，隔热帽12与模具接触，导热芯子温度不会降低，避免导热芯子直接碰触模具时热量损失过多导致芯子头部温度偏低，造成塑料出胶不顺，影响产品的成型。
芯子固定盖13位于热嘴主体8外的一段上设有凸缘，热嘴主体8外端对应芯子固定盖13的位置设有卡槽，外卡16设有卡槽内；导热铜套17嵌在热嘴主体8的流道内，流道套18设于导热铜套17内，导热铜套17和流道套18的两端均分别抵在热嘴安装孔内侧一段的端面和导热芯子后端的端面上；导热铜套17增加主体的热传导性能，热量传递速度快，流道内热量均匀，热效率高，塑料流动性能好，出胶顺畅；流道套18优选YT类钨钢合金，热处理硬度达到HRC60以上，热嘴主体8流道硬度高，耐磨损、耐腐蚀；导热铜套17、流道套18采用可以更换的结构，流道套18磨损后，拆开两头的固定零件，即可更换，维护方便，使用成本低，延长了热嘴的使用寿命，节能环保。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (8)

  1. 一种工程塑料类重复使用型热流道系统，包括气缸、阀针、流道板、导流套、热嘴主体、芯子和芯子固定盖；流道板上开有径向流道孔和水平流道孔，径向流道孔和水平流道孔呈L型相接，径向流道孔与水平流道孔相通，径向流道孔与水平流道孔接合处设有过渡圆角；导流套嵌入流道板中径向流道孔与水平流道孔的相接的位置；芯子通过芯子固定盖固定在热嘴主体上；阀针一端与气缸的活塞杆连接固定，阀针另一端穿过水平流道孔并伸入热嘴主体的流道内；其特征在于：所述流道板一侧开有热嘴安装孔，热嘴安装孔与水平流道孔相接，热嘴安装孔与水平流道孔的轴线在同一直线上；所述热嘴主体一端安装在热嘴安装孔内；所述芯子包括导热芯子、芯子保护套、阀针导向套和隔热帽；对应热嘴安装孔另一端的热嘴主体流道的端部开有芯子安装孔，导热芯子设在芯子安装孔内，且导热芯子前端伸出于芯子安装孔，导热芯子后端的外壁上设有芯子挂台，芯子保护套套在芯子挂台处的导热芯子外壁上，芯子保护套与芯子安装孔接触；所述导热芯子前端的内孔中开有导向套安装槽，所述阀针导向套嵌入导向套安装槽内，阀针导向套通过银离子焊接技术焊接在导向套安装槽内；所述芯子安装孔上靠近热嘴主体端面处设有一段固定盖安装螺纹，芯子固定盖通过固定盖安装螺纹安装在芯子安装孔内，芯子固定盖后端套住一部分导热芯子，芯子固定盖前端伸出于芯子安装孔；所述隔热帽为环形，且隔热帽外形锥度为50-60°，隔热帽采用3-8°的倒锥扣结构与导热芯子的前端连接；所述导热芯子由TZM合金类棒材加工而成；所述芯子保护套由高碳钢经过热处理工艺后加工成形；所述阀针导向套为YT类钨钢合金；所述隔热帽采用聚酰亚胺制成。
  2. 根据权利要求1所述的工程塑料类重复使用型热流道系统，其特征在于：所述热嘴安装孔呈两段式，热嘴安装孔外侧一段的直径大于内侧一段的直径， 热嘴安装孔内侧一段的直径大于所述水平流道孔的直径，热嘴安装孔外侧一段的热嘴安装孔内开有热嘴安装内螺纹；所述热嘴主体一端的外壁上开有与热嘴安装内螺纹相匹配的热嘴安装外螺纹，热嘴主体通过热嘴安装内螺纹和热嘴安装外螺纹的配合旋入流道板；所述热嘴主体的流道内嵌有导热铜套，导热铜套内嵌有流道套，导热铜套和流道套的两端均分别抵在所述热嘴安装孔内侧一段的端面和所述导热芯子后端的端面上，所述流道套为YT类钨钢合金，热处理硬度达到HRC60以上。
  3. 根据权利要求1所述的工程塑料类重复使用型热流道系统，其特征在于：所述流道板上对应导流套的位置设有定位上垫块、定位销和固定螺帽；所述流道板对应热嘴主体另一侧的位置开有与水平流道孔相通且与水平流道孔同轴线的导流套安装孔，导流套安装孔呈三段式，从流道板外至内三段的导流套安装孔的直径逐级减小，导流套嵌入流道板中位于径向流道孔与水平流道孔的相接的位置，嵌入径向流道孔与水平流道孔相接位置的导流套一端上开有圆弧型口，导流套轴线处设有导流套孔，导流套孔与径向流道孔和水平流道孔相通；所述导流套中间段设有导流套挂台，导流套一端伸入导流套安装孔最内侧的一段内，导流套挂台抵在导流套安装孔中间一段的端面上，导流套安装孔最外一段的内壁上设有螺帽安装内螺纹；所述固定螺帽呈两段式，一段外壁设有与导流套安装孔内螺纹相匹配的螺帽安装外螺纹，另一段为六角凸台，设有螺帽安装外螺纹一段的固定螺帽中心开有与导流套相匹配的孔，固定螺帽通过螺帽安装内螺纹与螺帽安装外螺纹的配合旋入导流套安装孔内且压住导流套，六角凸台伸出流道板；所述定位上垫块通过定位销固定在流道板外壁上，定位上垫块压在六角凸台上。
  4. 根据权利要求3所述的工程塑料类重复使用型热流道系统，其特征在于： 所述定位上垫块中心开有带扁位的阀针过孔；所述阀针呈圆柱形，阀针后端的位置设有扁位，阀针一端与气缸的活塞杆连接固定，阀针另一端穿过定位上垫块、固定螺帽、导流套、水平流道孔并伸入热嘴主体的流道内，阀针上的扁位与定位上垫块的阀针过孔相配合，导流套的导流套孔与阀针的圆形段配合封胶，导流套外径与流道板配合封胶。
  5. 根据权利要求1所述的工程塑料类重复使用型热流道系统，其特征在于：所述热嘴主体外壁上套有加热套，加热套通过卡箍固定。
  6. 根据权利要求1所述的工程塑料类重复使用型热流道系统，其特征在于：芯子固定盖位于热嘴主体外的一段上设有凸缘，热嘴主体外端对应芯子固定盖的位置设有卡槽，卡槽内设有外卡扣。
  7. 根据权利要求1所述的工程塑料类重复使用型热流道系统，其特征在于：所述导热芯子由TZM合金类棒材先加工成导热芯子半成品，导热芯子半成品内孔精加工到位，导热芯子与热嘴主体配合密封的部位留余量，导热芯子半成品进行高温热喷涂纳米陶瓷，厚度为5-10微米，涂层处理完后加工导热芯子与热嘴主体配合的端面，完成导热芯子加工。
  8. 根据权利要求1所述的工程塑料类重复使用型热流道系统，其特征在于：所述导向套安装槽呈两段式，靠近导热芯子端面的一段直径大于另一段的直径，阀针导向套嵌入导向套安装槽内直径小的一段，阀针导向套与导向套安装槽靠近导热芯子端面的一段直径形成焊接间隙，阀针导向套通过银离子焊接技术采用HYAg银焊条与导热芯子进行焊接。
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