Sprue cooling water jacket applied to hot runner system

Abstract

The sprue cooling water jacket applied to the hot runner system comprises a water jacket body, the upper end face and the lower end face of the water jacket body are planes, the interior of the water jacket body is hollow to form a first cavity, and openings are formed in the upper end and the lower end of the water jacket body. Internal threads are arranged on the inner circumferential wall of an opening in the lower end of the cylinder, a first concave part and a second concave part which are concavely extended from outside to inside are formed in the two sides of the outer wall of the cylinder respectively, the first concave part serves as a cooling medium inlet, and the second concave part serves as a cooling medium outlet; the upper end face and the lower end face of the sprue insert are planes, the sprue insert is hollow to form a second cavity, openings are formed in the upper end and the lower end of the sprue insert, and external threads matched with the internal threads are arranged on the peripheral wall of the opening in the upper end of the sprue insert. And the water jacket body is in threaded fit and sealed connection with the external thread of the sprue insert through the internal thread in the water jacket body so as to be connected with the sprue insert into a whole. The water jacket body and the sprue insert are assembled and connected in a threaded fit mode, the sprue insert can be detached and replaced, machining and repairing are convenient, and the maintenance cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot runner technology field, concretely relates to a gate cooling water jacket for hot runner system. BACKGROUND

[0002] The hot runner nozzle is one of important components of the hot runner system, and the temperature control of the hot runner nozzle is very important in the injection mold, if the temperature of the gate is too high, the molten material can be adhered to the valve needle when the mold is opened, if the temperature of the gate is too low, the molten material at the gate is supercooled, and then the valve needle is difficult to close. The temperature control of the hot runner nozzle is not good, which can seriously affect the production, and the final result is directly reflected on the quality of the plastic part, if the temperature of the hot runner nozzle is too high in the production process, the surface of the plastic part can appear obvious overheating plasticization, whitening and sun halo defects. In order to improve the cooling efficiency of the gate, ensure the uniform cooling of the plastic part, reduce the temperature difference, and improve the quality of the plastic part, a cooling scheme needs to be designed for the nozzle. Commonly used cooling schemes include: designing a cooling waterway on both sides of the nozzle, adding an insert to the gate, designing a water tower around the gate, and adding a nozzle cooling water jacket.

[0003] The cooling water jacket can uniformly distribute the cooling liquid by designing an annular waterway around the hot runner nozzle, effectively reduce the temperature of the nozzle and the mold cavity, and avoid the deformation of the plastic part and the surface quality problem caused by the high temperature. Moreover, the cooling water jacket is simple to process, convenient to install and uniform to cool, but the temperature of the nozzle still needs to be further adjusted.

[0004] In order to further improve the temperature of the nozzle, the cooling water jacket and the gate insert can be used at the same time. The existing design mainly has two kinds: 1. The cooling water jacket and the gate insert are made into an integrated cooling water jacket insert, and the disadvantage is that the gate is easy to be damaged, and the processing is difficult. 2. The cooling water jacket and the gate insert are two parts, which are tightly pressed in the system through the mold locking force, and the disadvantage is that the gate insert is not easy to take out when disassembling and repairing. In order to solve the problems existing in the prior art, the utility model comes into being. UTILITY MODEL CONTENTS

[0005] In view of one of the above technical problems, the utility model aims to provide a gate cooling water jacket for hot runner system.

[0006] The technical scheme of the utility model is:

[0007] The utility model aims to provide a gate cooling water jacket for hot runner system, which comprises:

[0008] The water jacket body has upper and lower end faces which are flat, and a hollow interior forming a first cavity with openings at both ends. An inner thread is provided on the inner wall of the lower end opening. First and second recesses are formed on both sides of the outer wall of the water jacket body, extending from the outside to the inside. The first recess is a cooling medium inlet, and the second recess is a cooling medium outlet.

[0009] The nozzle insert has upper and lower end faces which are flat, and a hollow interior forming a second cavity with openings at both ends. An outer thread is provided on the outer wall of the upper end opening, matching the inner thread.

[0010] The water jacket body is connected to the nozzle insert by the inner thread in the water jacket body and the outer thread of the nozzle insert.

[0011] Preferably, the water jacket body has a first end with an outer circumferential surface forming an inwardly recessed annular groove, which is a medium flow channel. The cooling medium inlet and the cooling medium outlet are connected by the annular groove.

[0012] Preferably, the first end has a first groove on the outer end face, extending in the circumferential direction and recessed from the first end to the second end. A first sealing member is provided in the first groove.

[0013] Preferably, the water jacket body is cylindrical, and the outer circumferential wall of the second end of the water jacket body extends radially outward to form a protrusion. A second sealing member is provided on the end face of the protrusion facing the first end of the water jacket body.

[0014] Preferably, the protrusion has a second groove on the end face facing the first end, extending in the circumferential direction and recessed from the first end to the second end. The second sealing member is provided in the second groove.

[0015] Preferably, the first and second sealing members are both sealing rings.

[0016] Preferably, the nozzle cooling water jacket further comprises a plurality of fasteners. The outer circumferential wall of the protrusion has a plurality of installation grooves spaced apart in the circumferential direction, recessed radially inward and extending from the second end to the first end, for mounting the fasteners.

[0017] Preferably, the number of fasteners is four, and the number of installation grooves is also four. The four installation grooves are uniformly distributed in the circumferential direction of the protrusion.

[0018] Preferably, the fastener comprises a screw and a gasket, the gasket being adapted to be pressed against the bottom surface of the corresponding mounting groove by the screw when the fastener is mounted.

[0019] Preferably, a heat-conductive filler is arranged between the inner thread and the outer thread.

[0020] Compared with the prior art, the application has the advantages that:

[0021] The gate cooling water jacket applied to the hot runner system of the utility model, the water jacket body and the gate insert are assembled and connected through thread cooperation, the gate insert can be disassembled and replaced, is convenient to process and is convenient to maintain, and the maintenance cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model will be further described in connection with the drawings and embodiments:

[0023] Figure 1 It is the three-dimensional structure schematic diagram of the gate cooling water jacket applied to the hot runner system of the utility model embodiment;

[0024] Figure 2 It is Figure 1 The axial section view of the gate cooling water jacket in

[0025] Figure 3 It is the working schematic diagram of the gate cooling water jacket of the utility model embodiment.

[0026] Among them: 100, gate cooling water jacket;10, water jacket body;11, cooling medium inlet;12, cooling medium outlet;13, first cavity;14, convex edge;15, mounting groove;16, ring groove;20, gate insert;21, second cavity;30, first sealing element;40, second sealing element;50, heat-conductive filler;60, fastener;61, screw;62, gasket;200, nozzle;300, mold cavity;301, mounting cavity;310, medium flow inlet;320, medium flow outlet;400, mold core;500, plastic product. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantage of the utility model more clear and obvious, the utility model will be further described in detail in connection with specific implementation and referring to the drawings. It should be understood that these descriptions are only exemplary, and are not intended to limit the scope of the utility model. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0028] See Figures 1 to 3The utility model discloses a gate cooling water jacket applied to hot runner system, including water jacket body 10, gate insert 20, fastener 60, first sealing piece 30 and second sealing piece 40. Among them, water jacket body 10 and gate insert 20 are connected through the assembly connection of thread cooperation, compared with the cooling water jacket insert of integral injection molding or through the locking force of mould in prior art, gate insert 20 can dismantle and replace, and convenient processing and convenient maintenance are low in maintenance cost. Fastener 60 is used to install gate cooling water jacket 100 in mould cavity 300, that is used for the connecting assembly of gate cooling water jacket 100 in mould cavity 300. First sealing piece 30 and second sealing piece 40 are used to realize the sealing between the contact surface of gate cooling water jacket 100 in mould cavity 300.

[0029] Specifically, as Figure 1 And Figure 2 Indicated, water jacket body 10 is substantially cylindrical. Water jacket body 10 is hollow inside to form first cavity 13, and the upper and lower two end faces of water jacket body 10 are plane to seal contact with the upper and lower two boss contact surfaces (not marked) of mounting cavity 301 in mould cavity 300, and the upper and lower two ends of water jacket body 10 have openings so that nozzle 200 can pass through and inject molten plastic into mould core 400 and form plastic product 500. The outer side wall of water jacket body 10 is specifically as Figure 3 Indicated first recess and second recess recessed from outside to inside on the left and right two side walls, and the first recess and the second recess do not penetrate the side wall of water jacket body 10, the first recess is implemented as cooling medium inlet 11, and the second recess is implemented as cooling medium outlet 12. Cooling water enters cooling medium inlet 11 through medium flow inlet 310 opened on mould cavity 300, flows to cooling medium outlet 12 along the gap between the outer circumferential surface of water jacket body 10 and the inner wall of mounting cavity 301 of mould cavity 300, heat exchange realizes temperature cooling adjustment of nozzle 200 and mould cavity 300 and is discharged by medium flow outlet 320 opened on mould cavity 300. In order to facilitate description and distinction, the upper and lower two ends of water jacket body 10, that is, the axial two ends, are described as first end (corresponding to lower end) and second end (corresponding to upper end) respectively. In order to realize the thread cooperation connection of water jacket body 10 and gate insert 20, the first end, that is, as Figure 2The illustrated water jacket body 10 has internal threads (not labeled) on its inner circumferential wall at its lower end. Similarly, for ease of description and distinction, the upper and lower ends of the gate insert 20 are described as the third end (corresponding to the upper end) and the fourth end (corresponding to the lower end), respectively. External threads (not labeled) matching the internal threads of the water jacket body 10 are provided on the outer circumferential wall of the third, or upper, end of the gate insert 20. This allows the internal threads of the water jacket body 10 to mate with the external threads of the gate insert 20, achieving an integrated assembly connection between the water jacket body 10 and the gate insert 20. In order to realize that the cooling medium flows from the cooling medium inlet 11 through the gap between the outer circumferential surface of the water jacket body 10 and the inner wall of the mounting cavity of the mold cavity 300 to the cooling medium outlet 12 to achieve temperature regulation of the nozzle 200 and the mold cavity 300, an annular groove 16 is formed on the outer circumferential surface of the first end of the water jacket body 100, which is concave from the outside to the inside, that is, the first end of the water jacket body 10 has a larger upper and lower outer diameter and a smaller middle outer diameter. The annular groove 16 is implemented as a medium flow channel, and the cooling medium inlet 11 is connected to the cooling medium outlet 12 through the annular groove 16. Specifically, the cooling medium inlet 11 and the cooling medium outlet 12 are both located above the annular groove 16 and the lower ends of the cooling medium inlet 11 and the lower ends of the cooling medium outlet 12 extend into the annular groove 16. In this way, the cooling medium will flow downward under the action of gravity, and the lower end of the water jacket body 10 is connected to the upper end of the gate insert 20. The cooling medium will also exchange heat with the gate insert 20, thereby realizing temperature cooling regulation of the entire gate cooling water jacket 100.

[0030] like Figure 2 As shown, the gate insert 20 is generally inverted-conical in shape. Its upper, third, end is cylindrical with external threads formed on its outer circumference. Its lower, fourth, end is also cylindrical, but with a smaller outer diameter than the third end, and its center is inverted-conical. This design is to accommodate the outer shape of the nozzle 200. Similarly, to allow the nozzle 200 to pass through, the gate insert 20 is hollowed to form a second cavity 21. The upper and lower end surfaces of the gate insert 20 are also planar, and both ends have openings. Once the gate insert 20 is connected to the water jacket body 10, the second cavity 21 communicates with the first cavity 13.

[0031] In order to achieve the sealing of the gate cooling water jacket 100 after being installed in the mold cavity 300, a first sealing member 30 is provided on the end surface of the first end of the water jacket body 10. The end surface of the first end is suitable for contacting the boss surface in the mold cavity 300. Figure 3 The water jacket body 10 is shown in FIG. 1 . The water jacket body 10 is shown in FIG. 1 . The water jacket body 10 is shown in FIG. 1 . The water jacket body 10 is shown in FIG. 1 . The water jacket body 10 is shown in FIG. 1 . The water jacket body 10 is shown in FIG. 1 . Figure 3The upper end face of the convex edge 14 of the mold cavity 300 is in contact with the upper end face of the mounting cavity (not shown) of the mold cavity 300, and the end face of the convex edge 14 towards the first end of the water jacket body 10 is also in contact with the upper end face of the mounting cavity (not shown) of the mold cavity 300. Figure 2 The lower end face of the convex edge 14 is provided with a second sealing member 40. The first sealing member 30 and the second sealing member 40 realize the double-end sealing of the gate cooling water jacket 100 in the mold cavity 300, and the sealing effect is strong. Further preferably, in order to facilitate the installation of the first sealing member 30, the outer end face of the first end is also provided with a first recess (not shown) which is recessed upwards and in which the first sealing member 30 is clamped. Figure 2 The lower end face of the first end is provided with a circumferentially extending first recess (not shown) which is recessed upwards and in which the first sealing member 30 is clamped. Figure 2 The lower end face of the convex edge 14 is provided with a circumferentially extending second recess (not shown) which is recessed upwards and in which the second sealing member 40 is clamped. Figure 2 The lower end face of the convex edge 14 is provided with a circumferentially extending second recess (not shown) which is recessed upwards and in which the second sealing member 40 is clamped. Figure 2 The lower end face of the convex edge 14 is provided with a circumferentially extending second recess (not shown) which is recessed upwards and in which the second sealing member 40 is clamped.

[0032] The gate cooling water jacket 100 of the embodiment of the utility model is connected with the mold cavity 300 through the fastener 60. For the fastener 60, the utility model preferably adopts a screw 61 and a gasket 62. Specifically, in order to realize the assembly of the gate cooling water jacket 100 in the mold cavity 300, a plurality of mounting grooves 15 which are recessed radially inward and in the direction from the second end to the first end are arranged on the outer circumferential surface of the convex edge 14 at intervals in the circumferential direction. Figure 2 The lower end face of the convex edge 14 is provided with a circumferentially extending second recess (not shown) which is recessed upwards and in which the second sealing member 40 is clamped.

[0033] According to some preferred embodiments of the utility model embodiment, as shown in Figure 2As shown, the inner thread and the outer thread are provided with a heat-conducting filler 50. The heat-conducting filler 50 is not particularly limited and can be a conventional raw material belt or heat-conducting silicone grease, for example. The heat-conducting filler 50 can be used to adjust the cooling effect of the nozzle.

[0034] Referring to Figure 3 Fig. 2 is a working schematic view of the nozzle cooling jacket 100 according to the present application. The nozzle cooling jacket 100 is installed in the installation cavity 301 of the mold cavity 300 through the fastener 60 and is sealed by the first sealing member 30 and the second sealing member 40. The nozzle 200 enters the bottom of the second cavity 21 through the first cavity 13, and the molten plastic is sprayed from the nozzle 200 and the lower end outlet of the nozzle insert 20 into the core cavity of the mold core 400 to form the plastic product 500. The cooling medium, such as cooling water or other cooling liquid, enters the cooling medium inlet 11 through the medium flow inlet 310 of the mold cavity 300, flows along the medium flow channel formed by the ring groove 16 and the inner wall of the installation cavity 301 of the mold cavity 300, exchanges heat with the nozzle 200 and the nozzle cooling jacket 100, and then reaches the cooling medium outlet 12 to control and adjust the temperature of the nozzle 200 and the nozzle cooling jacket 100, and is then discharged from the medium flow outlet 320 of the mold cavity 300. That is, the cooling medium flows in a substantially U-shaped manner, ensuring that the qualified plastic product 500 is produced.

[0035] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation of the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A gate cooling water jacket for a hot runner system, characterized in that: include: The water jacket body has flat upper and lower end surfaces, is hollow inside to form a first cavity, and has openings at both upper and lower ends. An inner peripheral wall of the lower end opening is provided with an internal thread, and a first recess and a second recess extending from the outside to the inside are respectively formed on both sides of the outer wall. The first recess is implemented as a cooling medium inlet, and the second recess is implemented as a cooling medium outlet. A gate insert, wherein the upper and lower end surfaces thereof are implemented as planes, the interior thereof is hollow to form a second cavity, and the upper and lower ends thereof have openings, and the outer peripheral wall of the upper end opening thereof is provided with an external thread matching the internal thread; The water jacket body is connected to the gate insert as a whole by the internal thread therein and the external thread of the gate insert being threadedly matched and sealed.

2. The gate cooling water jacket according to claim 1, characterized in that: One end of the water jacket body provided with the internal thread is implemented as the first end and the other end of the water jacket body opposite to the first end is implemented as the second end, the outer peripheral surface of the first end forms an inwardly recessed annular groove, the annular groove is implemented as a medium flow channel, and the cooling medium inlet is connected to the cooling medium outlet through the annular groove.

3. The gate cooling water jacket according to claim 2, characterized in that: A first groove is provided on the outer end surface of the first end and extends along the circumferential direction and is recessed from the first end to the second end. A first sealing member is clamped in the first groove.

4. The gate cooling water jacket according to claim 3, characterized in that: The water jacket body is cylindrical, and the outer peripheral wall of the second end of the water jacket body protrudes outward in the radial direction to form a convex edge. A second sealing member is provided on the end surface of the convex edge facing the first end of the water jacket body.

5. The gate cooling water jacket according to claim 4, characterized in that: A second groove is provided on the end surface of the convex edge facing the first end and extending in the circumferential direction and recessed in the direction from the first end to the second end. The second sealing member is clamped in the second groove.

6. The gate cooling water jacket according to claim 4, characterized in that: The first sealing member and the second sealing member are both sealing rings.

7. The gate cooling water jacket according to claim 4, characterized in that: The gate cooling water jacket further comprises a plurality of fasteners, and a plurality of mounting grooves for mounting the fasteners are circumferentially spaced apart on the outer peripheral wall of the convex edge, which are radially recessed inward and extend from the second end to the first end.

8. The gate cooling water jacket according to claim 7, characterized in that: The number of the fasteners is four, the number of the mounting grooves is also four, and the four mounting grooves are evenly spaced along the circumference of the convex edge.

9. The gate cooling water jacket according to claim 7, characterized in that: The fastener includes a screw and a washer, and the washer is adapted to be pressed against the bottom surface of the corresponding installation slot by the screw when the fastener is installed and tightened.

10. The gate cooling water jacket according to claim 1, characterized in that: A heat-conducting filler is provided between the internal thread and the external thread.

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