A hot runner feeding device for injection molding of plastic products

Abstract

The application relates to a hot runner glue feeding device for plastic product injection molding and belongs to the technical field of injection molds. The hot runner glue feeding device comprises a hot nozzle, a temperature controller and the like. The hot nozzle comprises a hollow hot nozzle body, a heating ring is arranged around the periphery of the hot nozzle body, a hollow heat conduction pipe is connected to the inside of the hot nozzle body, and the outlet of the heat conduction pipe extends towards the outlet direction of the hot nozzle body. The temperature controller comprises a cooling water jacket which surrounds the periphery of the hot nozzle, a heat conduction insert is arranged around the periphery of the cooling water jacket, and a temperature control cavity for controlling the outlet temperature of the hot nozzle is formed between the cooling water jacket and the heat conduction insert. When cold material is generated on the product surface at the front end of the hot nozzle, the temperature controller can be separately connected to high mold temperature, when sun halo or sunspot printing defects are generated on the product surface at the front end of the hot nozzle, the temperature controller can be separately connected to cooling water, so that the mold temperature can be freely controlled, and the product surface quality state is optimized.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of injection molds, in particular to a hot runner glue feeding device for injection molding of plastic products. BACKGROUND

[0002] In the design of an injection molding mold for a plastic product, the most important preliminary analysis work is the design of a hot runner system and the arrangement of glue feeding points. Due to the size limitation of the product, generally, for a complex product, more than one hot nozzle is needed, and multiple hot nozzles, a heating system of the hot runner and a plastic distribution system jointly constitute a hot runner system.

[0003] When arranging the glue feeding points of the hot nozzles, most of the time, the glue feeding points are arranged on the parting surface of the mold or a non-appearance surface. However, sometimes, due to the limitation of the product structure, the hot nozzles must be arranged directly on the appearance surface of the product. Otherwise, arranging the hot nozzles on other places will result in too large distance between the hot nozzles and too long filling path, and defects such as insufficient plastic filling, color difference caused by too fast cooling of the plastic and the like.

[0004] According to Figure 1 It can be known that the mold 1 is provided with a hot nozzle, and the hot nozzle comprises a hot nozzle body 3. An outer layer of the hot nozzle body 3 is provided with a heating ring 2. The heating ring 2 is used for heating the hot nozzle body 3, so that the internal melt is always kept in a high-temperature molten state.

[0005] A tip head 7 partially protruding from the front end of the hot nozzle body 3 is arranged in the hot nozzle body 3. The tip head 7 is made of SKD61 material and is connected with the nozzle body 3 through threads. The tip head 7 is used for cooperating with the mold 1 and plays a role in heat preservation and heat insulation, so as to avoid excessive loss of melt heat. A heat conduction pipe 4 located at the front end of the hot nozzle body 3 is arranged in the tip head 7. The heat conduction pipe 4 is connected with the tip head 7 through threads and is used for transferring the heat of the melt to the front end of the hot nozzle to the surface of the product, so as to avoid the melt from being supercooled due to the inability of the front end of the melt to be heated.

[0006] A valve needle 5 opening and closing the outlet of the tip head 7 is arranged in the heat conduction pipe 4. The valve needle 5 is used for sequentially controlling the opening and closing of the valve needle in each cycle of production of the hot nozzle. The valve needle 5 is controlled by an oil cylinder of the hot runner system and a time controller to control the opening and closing time of the valve needle. The molten plastic particles 8 located in the heat conduction pipe 4 are in a molten state under the heating of the heating ring 2 and are finally extruded from the outlet of the tip head 7 into the mold cavity of the mold 1 to form a plastic product 6.

[0007] The hot nozzle is a conventional design of a hot runner system, that is, a TIP head 7 structure is used at the front end of the hot nozzle to ensure cooperation with the mold 1, and the heat insulation effect avoids excessive heat loss. Through production verification, the structure of the hot nozzle directly points to the back of the plastic product 6, and the front end of the Tip head 7 has a transition cooperation section with the mold 1. This structure produces some fatal appearance defects in production, as follows:

[0008] 1. Cold material scar defect on the appearance of the product: The front end of the hot nozzle body 3 cannot be heated by the heating system, and the outer circle of the front end of the Tip head 7 has a cooperation section with the mold 1, and the inner circle of the heat pipe 4 is also a distance from the end surface of the hot nozzle. Only relying on the heat pipe 4 to transfer the heat of the high-temperature melt cannot play the role of outer heat insulation and inner heat preservation, resulting in too rapid temperature drop of the plastic, plastic cooling and caking, and cold material scar on the end surface of the hot nozzle and the outer surface of the product.

[0009] 2. Sunspot print on the outer surface of the product: If the cooperation section of the outer circle of the Tip head 7 with the mold 1 is shortened and the inner layer of the heat pipe 4 is extended to the end surface, although the cold material scar can be avoided to a certain extent, the heat loss of the front end of the hot nozzle will be too slow, the heat of the inlet area will be accumulated, and the sun halo or sunspot print defect will be formed on the surface of the product, and the product is still unacceptable.

[0010] 3. Multiple glue or material shortage in the inlet area on the back of the product: Because of the outer heating and inner high-temperature melt of the hot nozzle body 3, the working environment is harsh, and therefore, the hot nozzle body 3 inevitably has thermal expansion and cold shrinkage. When the hot nozzle is designed, if the calculation is not accurate, the hot nozzle body 3 will be excessively shrunk or insufficiently shrunk, the hot nozzle will be higher than the end surface of the mold, the material on the back of the product will be insufficient, or the hot nozzle will be lower than the end surface of the mold, and the product back will have multiple glue defects.

[0011] 4. Poor sealing of the product back and product flash defect: In the above design, because the valve needle 5 and the Tip head 7 at the front end of the hot nozzle adopt cylindrical surface sealing, repeated friction of the valve needle 5 under high temperature working condition causes excessive wear between the valve needle 5 and the Tip head 7, a gap is gradually formed between the valve needle 5 and the Tip head 7, plastic enters the gap, and finally flash burr and burr defects are formed. SUMMARY

[0012] The embodiment of the present application provides a hot runner inlet device for plastic product injection molding, to solve the problem of difficult control of the temperature of the front end of the hot nozzle in the related art, which causes defects on the surface of the product.

[0013] The embodiment of the present application provides a hot runner inlet device for plastic product injection molding, comprising:

[0014] The hot nozzle comprises a hollow hot nozzle body, the outer periphery of the hot nozzle body is surrounded by a heating ring for heating the hot nozzle body, the inner part of the hot nozzle body is connected with a hollow heat conduction pipe, and the outlet of the heat conduction pipe extends towards the outlet direction of the hot nozzle body;

[0015] The temperature controller comprises a cooling water jacket surrounding the outer periphery of the hot nozzle, the outer periphery of the cooling water jacket is surrounded by a heat conduction insert, and a temperature control chamber for controlling the outlet temperature of the hot nozzle is formed between the cooling water jacket and the heat conduction insert.

[0016] The temperature control chamber of the hot runner glue feeding device of the present application can be connected to the temperature control water channel, and the heat conduction insert itself has good heat dissipation effect. During injection molding production, the temperature control chamber can be connected to the temperature control water channel at other positions on the mold to control the temperature of the front end of the hot nozzle according to the appearance quality state of the product.

[0017] When cold material is generated on the surface of the front end of the hot nozzle, the temperature controller can be individually connected to high mold temperature, and when sun halo or sunspot printing defects are generated on the surface of the front end of the hot nozzle, the temperature controller can be individually connected to cooling water, so that the mold temperature can be freely controlled, and the appearance quality state of the product can be optimized.

[0018] In some embodiments: the cooling water jacket and the heat conduction insert are both top opening and four side closed structures, and the bottoms of the cooling water jacket and the heat conduction insert are both provided with coaxially arranged outlets;

[0019] The bottom of the cooling water jacket is provided with a boss extending into the outlet of the heat conduction insert, and the cooling water jacket outlet of the cooling water jacket is located on the boss;

[0020] The boss of the cooling water jacket is in transition fit connection with the outlet end of the heat conduction insert, and the bottom surface of the boss is flush with the bottom surface of the heat conduction insert.

[0021] In some embodiments: the hot nozzle further comprises a valve needle located in the heat conduction pipe and coaxially arranged with the heat conduction pipe, and the valve needle opens or closes the cooling water jacket outlet of the cooling water jacket through telescopic movement;

[0022] The bottom of the valve needle is provided with a conical head with gradually decreasing diameter, the cooling water jacket outlet of the cooling water jacket is a conical hole with gradually decreasing diameter, and the conical head is in sealing fit connection with the conical hole.

[0023] In some embodiments: the taper angle of the conical head is smaller than the taper angle of the conical hole, so that the conical head and the conical hole form linear sealing in sealing fit with each other.

[0024] In some embodiments: an axial gap is reserved between the outlet end of the hot nozzle body and the cooling water jacket, and the outlet end of the heat conduction pipe is in transition fit connection with the cooling water jacket;

[0025] A sealing ring is arranged between the cooling jacket and the heat-conducting insert to seal the temperature control chamber, and the cooling jacket and the heat-conducting insert are detachably connected by a first screw.

[0026] In some embodiments, the outlet end of the heat-conducting insert is provided with an annular temperature control channel, and the annular temperature control channel and the temperature control chamber are both connected with a mold temperature controller for controlling the outlet temperature of the hot nozzle.

[0027] In some embodiments, the temperature control chamber has an annular structure, and the outer wall of the cooling jacket is provided with a stopper in interference connection with the heat-conducting insert, and the stopper divides the temperature control chamber into a "C" structure.

[0028] The sidewall of the heat-conducting insert is provided with a medium inlet and a medium outlet for communicating the temperature control chamber and the annular temperature control channel, and the medium inlet and the medium outlet are connected with the mold temperature controller through pipelines.

[0029] In some embodiments, the heat-conducting pipe and the heat-conducting insert are both made of beryllium copper material.

[0030] In some embodiments, the mold is further provided with a through hole for accommodating the hot nozzle and the temperature controller, the heat-conducting insert is connected with the mold through a second screw, and the bottom surface of the heat-conducting insert is flush with the bottom surface of the mold.

[0031] In some embodiments, the hot nozzle body and the heating ring are connected through external threads, and the hot nozzle body and the heat-conducting pipe are connected through internal threads.

[0032] The technical scheme provided by the present application has the beneficial effects of:

[0033] The hot runner feeding device for plastic product injection molding provided by the embodiments of the present application is provided with a hot nozzle, which includes a hollow hot nozzle body, a heating ring surrounding the outer periphery of the hot nozzle body for heating the hot nozzle body, a hollow heat-conducting pipe connected inside the hot nozzle body, and an outlet of the heat-conducting pipe extending towards the outlet direction of the hot nozzle body; a temperature controller, which includes a cooling jacket surrounding the outer periphery of the hot nozzle, a heat-conducting insert surrounding the outer periphery of the cooling jacket, and a temperature control chamber formed between the cooling jacket and the heat-conducting insert for controlling the outlet temperature of the hot nozzle.

[0034] Therefore, the temperature control chamber of the hot runner glue feeding device of the application can be connected to the temperature control water path, and the heat conduction insert has good heat dissipation effect. In the injection molding production, the temperature control chamber can be connected to the temperature control water path at other positions on the mold to control the temperature at the front end of the hot nozzle according to the appearance quality state of the product. When cold material is generated on the surface of the product at the front end of the hot nozzle, the temperature controller can be individually connected to high mold temperature. When sun halo or sunspot and other defects are generated on the surface of the product at the front end of the hot nozzle, the temperature controller can be individually connected to cooling water. Therefore, the mold temperature can be freely controlled, and the surface quality state of the product is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 It is a structure schematic diagram of the hot nozzle in the background art;

[0037] Figure 2 It is a structure schematic diagram of the hot nozzle of the embodiment of the application;

[0038] Figure 3 It is Figure 2 It is a local enlarged view of M in the middle;

[0039] Figure 4 It is a structure schematic diagram of the cooling water jacket of the embodiment of the application.

[0040] Reference signs:

[0041] 1, mold; 2, heating ring; 3, hot nozzle body; 4, heat conduction pipe; 5, valve needle; 6, plastic product; 7, Tip head; 8, molten plastic particles; 9, cooling water jacket; 10, heat conduction insert; 11, first screw; 12, second screw; 13, temperature control chamber; 14, sealing ring; 15, annular temperature control channel; 91, boss; 92, cooling water jacket outlet; 93, stop block; 94, annular groove. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments of the application will be described clearly and completely in the following with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0043] The hot runner glue feeding device for plastic product injection molding can solve the problem of difficult control of the temperature of the front end of the hot nozzle in the related art, which causes defects on the product surface.

[0044] Referring to Figure 2 and Figure 3 The hot runner glue feeding device for plastic product injection molding comprises the following components:

[0045] The hot nozzle comprises a hollow hot nozzle body 3 which is a hollow metal pipe structure penetrating from top to bottom. A heating ring 2 for heating the hot nozzle body 3 is arranged around the outer periphery of the hot nozzle body 3. The heating ring 2 is preferably an electric heating ring. A hollow heat conduction pipe 4 is connected to the inside of the hot nozzle body 3, and the outlet of the heat conduction pipe 4 extends towards the outlet direction of the hot nozzle body 3. The heat conduction pipe 4 is used to transfer the heat of the hot nozzle body 3 to the front end of the hot nozzle to the product surface, so as to avoid the overcooling of the melt caused by the inability of the melt front end to be heated.

[0046] The temperature controller comprises a cooling water jacket 9 arranged around the outer periphery of the hot nozzle. A heat conduction insert 10 is arranged around the outer periphery of the cooling water jacket 9. A temperature control chamber 13 for controlling the outlet temperature of the hot nozzle is formed between the cooling water jacket 9 and the heat conduction insert 10. The temperature controller and the hot nozzle are designed in a split type. The cooling water jacket 9 and the heat conduction insert 10 are added to the front end of the nozzle. The cooling water jacket 9 can be made of steel, and the heat conduction insert 10 can be made of beryllium copper. The cooling water jacket 9 and the heat conduction insert 10 jointly constitute the temperature control chamber 13 for controlling the temperature of the front end of the hot nozzle. The temperature control chamber 13 can be filled with a medium at a set temperature to accurately adjust the temperature of the front end of the hot nozzle.

[0047] The temperature control chamber 13 of the hot runner glue feeding device can be connected to a temperature control water circuit. At the same time, the heat conduction insert 10 has good heat dissipation effect. During injection molding production, the temperature control chamber 13 can be connected to the temperature control water circuit at other positions on the mold 1 to control the temperature of the front end of the hot nozzle. When cold material is generated on the product surface at the front end of the hot nozzle, the temperature controller can be individually connected to a high mold temperature. When defects such as sun halo or sunspot are generated on the product surface at the front end of the hot nozzle, the temperature controller can be individually connected to cooling water. Therefore, the mold temperature can be freely controlled, and the quality state of the product surface can be optimized.

[0048] In some optional embodiments, referring to Figure 2 and Figure 3As shown, the embodiment of the present application provides a hot runner glue feeding device for plastic product injection molding. The cooling water jacket 9 and the heat conducting insert 10 of the hot runner glue feeding device are both cavity structures with a top opening and a closed periphery. The bottom of the cooling water jacket 9 and the heat conducting insert 10 is provided with an outlet coaxially arranged. The bottom of the cooling water jacket 9 is provided with a boss 91 extending into the outlet of the heat conducting insert 10, and the cooling water jacket outlet 92 of the cooling water jacket 9 is located on the boss 91. The boss 91 of the cooling water jacket 9 is in transition fit connection with the outlet end of the heat conducting insert 10, and the bottom surface of the boss 91 is flush with the bottom surface of the heat conducting insert 10.

[0049] The boss 91 of the cooling water jacket 9 is in transition fit connection with the outlet of the heat conducting insert 10 at room temperature (in interference fit state at high temperature), which avoids the formation of gaps at the connection between the boss 91 of the cooling water jacket 9 and the heat conducting insert 10, and prevents the easy hiding of molten glue during later injection molding production.

[0050] In some optional embodiments, referring to Figure 2 and Figure 3 As shown, the embodiment of the present application provides a hot runner glue feeding device for plastic product injection molding. The hot nozzle of the hot runner glue feeding device further comprises a valve needle 5 located in the heat conducting pipe 4 and coaxially arranged with the heat conducting pipe 4. The valve needle 5 opens or closes the cooling water jacket outlet 92 of the cooling water jacket 9 through extension and retraction movements. The bottom of the valve needle 5 is provided with a tapered head with a gradually reduced diameter, and the cooling water jacket outlet 92 of the cooling water jacket 9 is a tapered hole with a gradually reduced diameter. The tapered head and the tapered hole are in sealing fit connection. The taper angle β of the tapered head is less than the taper angle α of the tapered hole, so that the tapered head and the tapered hole form a linear seal in sealing fit.

[0051] The bottom of the valve needle 5 is provided with a tapered head with a gradually reduced diameter, and the cooling water jacket outlet 92 of the cooling water jacket 9 is a tapered hole with a gradually reduced diameter. The tapered head and the tapered hole are in sealing fit connection. The front end of the valve needle 5 and the cooling water jacket outlet 92 of the cooling water jacket 9 adopt a tapered surface glue sealing structure, which effectively avoids the generation of back edge burr defects of the plastic product 6 due to serious wear of the valve needle 5 during reciprocating movement. The tapered surface of the valve needle 5 and the cooling water jacket 9 adopts tapered surface glue sealing, and the taper angle β of the valve needle 5 is less than or equal to the taper angle α of the cooling water jacket outlet 92, which replaces the cylindrical surface glue sealing between the valve needle 5 and the mold. Once the valve needle 5 or the cooling water jacket 9 is worn, the tapered surface can still effectively ensure good glue sealing, and gaps and edge burr defects will not be generated.

[0052] In some optional embodiments, referring to Figure 2 and Figure 3As shown, the embodiment of the present application provides a hot runner glue feeding device for plastic product injection molding. An axial gap h is reserved between the outlet end of the hot nozzle body 3 and the cooling water jacket 9 of the hot runner glue feeding device. The gap h is used to compensate for the hot nozzle front end rising above or below the mold 1 end surface due to thermal expansion and contraction of the hot nozzle, and the hot nozzle overstretching and interfering with the mold 1. The outlet end of the heat conduction pipe 4 is transitionally connected with the cooling water jacket 9 (zero gap between the heat conduction pipe 4 in the heated state and the cooling water jacket 9), so as to prevent the gap between the outlet end of the heat conduction pipe 4 and the cooling water jacket 9 from easily accommodating plastic during injection molding, which causes the accumulated plastic to be degraded by long-term heating, and then enters the mold cavity and the product surface.

[0053] A sealing ring 14 for sealing the temperature control chamber 13 is arranged between the cooling water jacket 9 and the heat conduction insert 10. The sealing ring 14 is provided with two sealing rings, one of which is located at the top of the temperature control chamber 13, and the other is located at the bottom of the temperature control chamber 13. The top of the cooling water jacket 9 is provided with a flange plate connected with the heat conduction insert 10, and the bottom surface of the flange plate is provided with an annular groove 94 for installing the top sealing ring 14. The bottom of the cooling water jacket 9 is also provided with an annular groove 94 for installing the sealing ring 14. The flange plate of the cooling water jacket 9 and the top surface of the heat conduction insert 10 are detachably connected by the first screw 11, which connects the cooling water jacket 9 and the heat conduction insert 10 into a whole and compresses the sealing ring 14 to seal the temperature control chamber 13 and prevent water leakage.

[0054] In some optional embodiments, see Figures 2 to 4 As shown, the embodiment of the present application provides a hot runner glue feeding device for plastic product injection molding. The outlet end of the heat conduction insert 10 of the hot runner glue feeding device is provided with an annular temperature control channel 15, and the annular temperature control channel 15 and the temperature control chamber 13 are both connected with a mold temperature machine (not shown in the figure) for controlling the outlet temperature of the hot nozzle. The temperature control chamber 13 has a ring structure, and a stop block 93 is arranged on the outer wall of the cooling water jacket 9 and is in interference connection with the heat conduction insert 10. The stop block 93 divides the temperature control chamber 13 into a "C" structure. The sidewall of the heat conduction insert 10 is provided with a medium inlet and a medium outlet for communicating the temperature control chamber 13 and the annular temperature control channel 15, and the medium inlet and the medium outlet are connected with the mold temperature machine through pipelines.

[0055] The application embodiment is provided with an annular temperature control channel 15 at the outlet end of the heat conduction insert 10, which can synchronously and independently control the temperature of the outlet end of the hot nozzle with the temperature control chamber 13. The temperature control chamber 13 is annular, and the outer wall of the cooling water jacket 9 is provided with a stop block 93 in interference connection with the heat conduction insert 10. The stop block 93 is in transition fit (zero gap in hot state) with the heat conduction insert 10, which ensures that the temperature control chamber 13 formed between the cooling water jacket 9 and the heat conduction insert 10 is a one-way water path, that is, the water path can only flow in one direction from the medium inlet to the medium outlet, and cannot form a dead water in a ring shape, thereby ensuring that the temperature of the local area can be controlled by water temperature.

[0056] The medium inlet and the medium outlet are connected with the mold temperature controller through pipelines. During injection molding, the mold temperature controller can integrate the annular temperature control channel 15 and the temperature control chamber 13 with the cooling water path at other positions on the mold 1 to control the mold temperature as a whole according to the appearance quality state of the product, or can individually connect 1 set of water paths according to the needs of injection molding to control the temperature of the front end of the hot nozzle respectively. When cold material is generated on the surface of the front end of the hot nozzle, the high mold temperature can be individually connected to this area. When sun halo or sunspot printing defects are generated on the surface of the front end of the hot nozzle, the cooling water can be individually connected to this area. Therefore, the mold temperature can be freely controlled, and the appearance quality state of the product can be optimized.

[0057] In some optional embodiments, referring to Figures 2 to 4 As shown in the figure, the application embodiment provides a hot runner feeding device for injection molding of plastic products. The hot runner feeding device further comprises a mold 1, and the mold 1 is further provided with a through hole for accommodating a hot nozzle and a temperature controller. The heat conduction insert 10 is connected with the mold 1 through the second screw 12, and the bottom surface of the heat conduction insert 10 is flush with the bottom surface of the mold 1. The heat conduction pipe 4 and the heat conduction insert 10 are both made of beryllium copper material with good heat conduction performance. The heat conduction insert 10 dissipates heat from the front end of the hot nozzle to avoid local temperature accumulation. The hot nozzle body 3 is connected with the heating ring 2 through external threads, and the hot nozzle body 3 is connected with the heat conduction pipe 4 through internal threads, so as to facilitate the installation and disassembly of the hot nozzle body 3, the heating ring 2 and the heat conduction pipe 4.

[0058] Working principle

[0059] The application embodiment provides a hot runner feeding device for injection molding of plastic products. Since the hot runner feeding device of the application is provided with a hot nozzle, the hot nozzle comprises a hollow hot nozzle body 3, a heating ring 2 is arranged around the outer periphery of the hot nozzle body 3 to heat the hot nozzle body 3, a hollow heat conduction pipe 4 is connected to the inside of the hot nozzle body 3, and the outlet of the heat conduction pipe 4 extends towards the outlet direction of the hot nozzle body 3; a temperature controller, which comprises a cooling water jacket 9 arranged around the outer periphery of the hot nozzle, and a heat conduction insert 10 arranged around the outer periphery of the cooling water jacket 9, and a temperature control chamber 13 for controlling the temperature of the outlet of the hot nozzle is formed between the cooling water jacket 9 and the heat conduction insert 10.

[0060] Therefore, the temperature control chamber 13 of the hot runner glue feeding device of the present application can be connected to the temperature control water path, and the heat conduction insert 10 itself has good heat dissipation effect. In the injection molding production, the temperature control chamber 13 can be connected to the temperature control water path at other positions on the mold 1 to control the temperature of the front end of the hot nozzle according to the appearance quality state of the product. When the cold material is generated on the product surface at the front end of the hot nozzle, the temperature controller can be individually connected to the high mold temperature. When the sun halo or sunspot and other defects are generated on the product surface at the front end of the hot nozzle, the temperature controller can be individually connected to the cooling water. Therefore, the mold temperature can be freely controlled, and the appearance quality state of the product surface can be optimized.

[0061] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0063] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications and changes can be made to these embodiments without departing from the spirit and scope of the application. It is intended that the scope of the application should not be limited by the particular representative embodiments described above.

Claims

1. A hot runner feeding device for injection molding of plastic products, characterized in that, It comprises: a hot nozzle comprising a hollow hot nozzle body (3), the outer periphery of the hot nozzle body (3) is surrounded by a heating ring (2) for heating the hot nozzle body (3), the inside of the hot nozzle body (3) is connected with a hollow heat conduction pipe (4), and the outlet of the heat conduction pipe (4) extends towards the outlet direction of the hot nozzle body (3); a temperature controller comprising a cooling water jacket (9) surrounding the outer periphery of the hot nozzle, the outer periphery of the cooling water jacket (9) is surrounded by a heat conduction insert (10), and a temperature control chamber (13) for controlling the outlet temperature of the hot nozzle is formed between the cooling water jacket (9) and the heat conduction insert (10); both the cooling water jacket (9) and the heat conduction insert (10) are of a structure with an open top and a closed periphery, and the bottoms of the cooling water jacket (9) and the heat conduction insert (10) are provided with coaxially arranged outlets; the bottom of the cooling water jacket (9) is provided with a boss (91) extending into the outlet of the heat conduction insert (10), and the cooling water jacket outlet (92) of the cooling water jacket (9) is located on the boss (91); the boss (91) of the cooling water jacket (9) is in transition fit connection with the outlet end of the heat conduction insert (10), and the bottom surface of the boss (91) is flush with the bottom surface of the heat conduction insert (10); an axial gap is reserved between the outlet end of the hot nozzle body (3) and the cooling water jacket (9), and the outlet end of the heat conduction pipe (4) is in transition fit connection with the cooling water jacket (9); the outlet end of the heat conduction insert (10) is provided with an annular temperature control channel (15), and both the annular temperature control channel (15) and the temperature control chamber (13) are connected with a mold temperature machine for controlling the outlet temperature of the hot nozzle.

2. The hot runner feeding device for plastic product injection molding according to claim 1, characterized in that: the hot nozzle further comprises a valve needle (5) located in the heat conduction pipe (4) and coaxially arranged with the heat conduction pipe (4), and the valve needle (5) opens or closes the cooling water jacket outlet (92) of the cooling water jacket (9) through telescopic movement; the bottom of the valve needle (5) is provided with a tapered head with gradually reduced diameter, the cooling water jacket outlet (92) of the cooling water jacket (9) is a tapered hole with gradually reduced diameter, and the tapered head and the tapered hole are in sealing fit connection.

3. The hot runner feeding device for plastic product injection molding according to claim 2, characterized in that: the taper angle of the tapered head is smaller than the taper angle of the tapered hole, so that the tapered head and the tapered hole form a linear seal in sealing fit.

4. The hot runner feeding device for plastic product injection molding according to claim 1, characterized in that: a sealing ring (14) for sealing the temperature control chamber (13) is arranged between the cooling water jacket (9) and the heat conduction insert (10), and the cooling water jacket (9) and the heat conduction insert (10) are detachably connected through a first screw (11).

5. The hot runner feeding device for plastic product injection molding according to claim 1, characterized in that: The temperature control chamber (13) is annular structure, the outer wall of the cooling jacket (9) is provided with the block (93) which is interference connected with the heat conduction insert (10), the block (93) separates temperature control chamber (13) into "C" structure; The side wall of the heat conduction insert (10) is provided with the medium inlet and the medium outlet which are communicated with the temperature control chamber (13) and the annular temperature control channel (15), and the medium inlet and the medium outlet are connected with the mold temperature controller through pipeline.

6. The hot runner feeding device for plastic product injection molding according to claim 1, characterized in that: The heat conduction pipe (4) and the heat conduction insert (10) are made of beryllium copper material.

7. The hot runner feeding device for plastic product injection molding according to claim 1, characterized in that: Further comprising a mold (1), the mold (1) is further provided with a through hole which accommodates the hot nozzle and the temperature controller, the heat conduction insert (10) is connected with the mold through the second screw (12), and the bottom surface of the heat conduction insert (10) is flush with the bottom surface of the mold (1).

8. The hot runner feeding device for plastic product injection molding according to claim 1, characterized in that: The hot nozzle body (3) and the heating ring (2) are connected through external thread, and the hot nozzle body (3) and the heat conduction pipe (4) are connected through internal thread.

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