Hot nozzle assembly and hot runner system including same

Abstract

The utility model discloses a hot nozzle assembly, including along the same axis extension's hot nozzle body and set up in the mouth head part of hot nozzle body inside, the first flow passage of hollow and forming along the axial extension in the hot nozzle body inside, the second flow passage of hollow and forming along the axial extension in the mouth head part inside, the first flow passage and the second flow passage are linked together, and the mouth head part forms the pouring gate at the end of second flow passage, the contact surface that is formed with around the pouring gate on the mouth head part, and the pouring gate projects the contact surface downwards, the hot nozzle body still includes the heat insulation cap of installing on the contact surface, the heat insulation cap is provided with the through -hole along the axle core, and the pouring gate is accommodated in the through -hole, and the bottom of heat insulation cap is flush with the end surface of pouring gate. Thus, in the work, the temperature of heat insulation cap bottom is lower, and the temperature of the end of hot nozzle assembly will be always lower than the temperature of scalding product, and the product is protected, and the product quality is ensured stable, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of hot runner technology, and in particular to a hot nozzle assembly and a hot runner system including the same. Background Technology

[0002] Currently, the most commonly used injection molds in the injection molding industry are hot runner injection molds. Compared with ordinary molds, plastic products molded by hot runner systems are of higher quality, and hot runner systems have advantages such as saving raw materials, improving production efficiency, and high degree of automation.

[0003] Hot runner systems typically include a hot nozzle assembly, which generally consists of a hot nozzle body and a nozzle head. Molten plastic flows from the hot nozzle body through the nozzle head into the mold cavity. In existing technologies, unstable hot nozzle temperature control can lead to poor molten plastic flow, or high injection pressure and poor mold cooling can cause the hot nozzle head to overheat. After the injection molding process, the hot nozzle head can easily stick to the product surface, causing damage and affecting product quality. Summary of the Invention

[0004] To address the technical problems in the prior art, the purpose of this utility model is to provide a hot nozzle assembly and a hot runner system including the same. To achieve one of the above-mentioned objectives, an embodiment of this utility model provides a hot nozzle assembly, including a hot nozzle body extending along the same axis and a nozzle head disposed inside the hot nozzle body. The hot nozzle body is hollow and forms a first flow channel extending axially, and the nozzle head is hollow and forms a second flow channel extending axially. The first flow channel and the second flow channel are connected, and the nozzle head forms a gate at the end of the second flow channel. A contact surface surrounding the gate is formed on the nozzle head, and the gate protrudes downward from the contact surface. The hot nozzle body also includes a heat insulation cap mounted on the contact surface. The heat insulation cap has a through hole along its axis, and the gate is accommodated in the through hole. The bottom of the heat insulation cap is flush with the end face of the gate.

[0005] As a further improvement of one embodiment of the present invention, the contact surface of the mouth head is recessed inward to form an assembly groove, and the heat insulation cap includes a base and an assembly part protruding upward from the base, the assembly part being adapted to the assembly groove.

[0006] As a further improvement of one embodiment of the present invention, the assembly groove is an annular recess and the assembly part is an annular protrusion.

[0007] As a further improvement of one embodiment of the present invention, the bottom of the base is smooth.

[0008] As a further improvement of one embodiment of the present invention, the assembly part includes an outer ring surface, a top surface, and an inner ring surface that extend sequentially, and an arc-shaped transition is provided between the top surface and the outer ring surface, and between the top surface and the inner ring surface.

[0009] As a further improvement of one embodiment of the present invention, the through hole is a round hole, and the assembly part and the through hole are coaxial.

[0010] As a further improvement of one embodiment of the present invention, the base includes a first ring portion located at the outer edge of the assembly portion ring and a second ring portion located at the inner edge of the assembly portion ring, wherein the ring width of the assembly portion is smaller than the ring width of the second ring portion.

[0011] As a further improvement of one embodiment of the present invention, the nozzle head includes an upper end and a lower end that are fitted together with each other, the upper end is accommodated inside the hot nozzle body, and the lower end protrudes from below the hot nozzle body; the heat insulation cap is installed on the lower end.

[0012] As a further improvement of one embodiment of the present invention, the hot nozzle assembly further includes a locking washer, which surrounds the outer side of the nozzle head and abuts against the hot nozzle body.

[0013] To achieve one of the above-mentioned objectives of the utility model, one embodiment of the utility model provides a hot runner system, which includes the hot nozzle assembly described above.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the heat insulation cap is made of a material with poor thermal conductivity, such as titanium alloy or other materials, so that when the hot nozzle assembly comes into contact with the product, the temperature at the heat insulation cap will always be lower than the temperature that would burn the product, thereby preventing the nozzle from burning the product, protecting the product, ensuring stable product quality, and improving product quality. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a hot nozzle assembly according to an embodiment of the present invention; Figure 2 This is a longitudinal sectional view of a hot nozzle assembly according to an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged diagram of circle A in the middle; Figure 4 This is a longitudinal sectional view of a hot nozzle assembly with the heat insulation cap removed according to an embodiment of the present invention.

[0016] Figure 5 yes Figure 4 Enlarged diagram of circle B in the middle; Figure 6 This is a longitudinal sectional view of a heat-insulating cap according to an embodiment of the present invention; Figure 7 is a perspective structural view of the heat insulation cap according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0017] Hereinafter, the present utility model will be described in detail with reference to specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present utility model, and any structural, methodological, or functional transformations made by those of ordinary skill in the art based on these embodiments are all included in the protection scope of the present utility model.

[0018] Referring to Figures 1 to 7 , an embodiment of the present utility model provides a hot nozzle assembly 100 and a hot runner system having the hot nozzle assembly 100. Specifically, the hot runner system is configured as a pin-type hot runner system, which includes a manifold assembly, the hot nozzle assembly 100, a valve pin and a driving device.

[0019] Generally, the hot nozzle assembly 100 is assembled on the manifold assembly, and a hot runner for molten rubber material to flow is formed in the manifold assembly and the hot nozzle assembly 100. The hot runner includes a distribution channel formed in the manifold assembly and a conveying channel formed in the hot nozzle assembly 100, wherein: the distribution channel has a rubber inlet adapted to an injection molding machine nozzle and at least one rubber outlet; the hot nozzle assembly 100 is assembled at the rubber outlet of the distribution channel, the conveying channel is in fluid communication with the distribution channel, and the conveying channel has a gate 21 corresponding to a mold cavity.

[0020] Specifically, in the present utility model, the hot nozzle assembly 100 includes a hot nozzle body 10 extending along the same axis and a nozzle head 20 disposed inside the hot nozzle body 10. The hot nozzle body 10 is hollow inside and forms a first flow channel 101 extending axially, the nozzle head 20 is hollow inside and forms a second flow channel 202 extending axially, the first flow channel 101 and the second flow channel 202 are communicated with each other, and the nozzle head 20 forms the gate 21 at the end of the second flow channel 202. Of course, the hot nozzle assembly 100 further includes a valve pin disposed along the same axis, and the valve pin is axially movably disposed in the first flow channel 101 and the second flow channel 202 to open or close the gate 21; A contact surface 22 surrounding the gate 21 is formed on the nozzle head 20, and the gate 21 protrudes downward from the contact surface 22; the hot nozzle body 10 further includes a heat insulation cap 3 mounted on the contact surface 22, the heat insulation cap 3 is provided with a through hole 30 along the axial center, the gate 21 is accommodated in the through hole 30, and the bottom of the heat insulation cap 3 is flush with the end surface of the gate 21.

[0021] The heat insulation cap 3 is made of a material with poor thermal conductivity, such as titanium alloy or other materials. Therefore, when the hot nozzle assembly 100 comes into contact with the product, the temperature at the heat insulation cap 3 will always be lower than the temperature that would burn the product, thereby preventing the nozzle from burning the product, protecting the product, ensuring stable product quality, and improving product quality.

[0022] Furthermore, the contact surface 22 of the nozzle head 20 is recessed inward to form an assembly groove 221. The heat insulation cap 3 includes a base 32 and an assembly part 31 protruding upward from the base 32. The assembly part 31 is adapted to the assembly groove 221. The heat insulation cap 3 is installed on the contact surface 22 of the nozzle head 20 by snap-fitting. Specifically, the recessed assembly groove 221 on the contact surface 22 snaps into the protruding assembly part 31 on the heat insulation cap 3. The assembly part 31 can be welded into the assembly groove 221. Of course, the assembly part 31 can also be fixed to the assembly groove 221 by other means.

[0023] In this specific embodiment, the mounting groove 221 is an annular recess, and the mounting part 31 is an annular protrusion. Therefore, when the heat insulation cap 3 comes into contact with the contact surface 22 of the nozzle head 20, it can more easily find the corresponding position and be installed in place in one go. Of course, if the mounting part 31 and the mounting groove 221 have other structures, as long as they can be assembled and fixed together, the purpose of this utility model can also be achieved.

[0024] like Figure 6 As shown, the bottom of the base 32 is smooth. In this embodiment, the bottom of the base 32 is smooth to better fit the product. The bottom of the base 32 is on the same horizontal plane and flush with the end face of the gate 21. Of course, if the bottom of the base 32 is not smooth and has a multi-layered structure, as long as the lowest side of the bottom surface of the base 32 is flush with the end face of the gate 21, the purpose of preventing the product from being scalded in this utility model can be achieved.

[0025] The assembly part 31 includes an outer ring surface 311, a top surface 312, and an inner ring surface 313 extending sequentially. A rounded transition is provided between the top surface 312 and the outer ring surface 311, and between the top surface 312 and the inner ring surface 313. That is, the outer ring surface 311 and the top surface 312, and the top surface 312 and the inner ring surface 313 of the assembly part 31, are rounded corners. Correspondingly, the concave portion of the assembly groove 221 also forms a corresponding rounded corner. Of course, if the top surface 312 and the outer ring surface 311, and the top surface 312 and the inner ring surface 313, are sharp angles or bends, the purpose of this utility model can also be achieved. The rounded transition on the assembly part 31 increases the contact area between the assembly part 31 and the assembly groove 221, making the connection between the two tighter. Specifically, the assembly part 31 is fixed to the assembly groove 221 by welding.

[0026] like Figure 7 As shown, the through hole 30 of the heat insulation cap 3 is a circular hole, and the assembly part 31 and the through hole 30 are coaxial. The through hole 30 can also be other shapes, as long as it can accommodate the gate 21, the purpose of this utility model can be achieved. In this specific embodiment, the through hole 30 is a circular hole, and the assembly part 31 is also annular, and the two have the same axis, so the whole structure is more symmetrical, beautiful, and easier to manufacture.

[0027] Furthermore, the base 32 includes a first ring portion 321 located at the outer edge of the mounting portion 31 and a second ring portion 322 located at the inner edge of the mounting portion 31, wherein the ring width of the mounting portion 31 is smaller than the ring width of the second ring portion 322. Figure 6 and Figure 7 As shown, the base 32 has an annular mounting portion 31 protruding from it. Therefore, a first ring portion 321 is formed outside the ring of the mounting portion 31, and a second ring portion 322 is formed inside the ring of the mounting portion 31. The through hole 30 is formed inside the second ring portion 322. Furthermore, the ring width of the mounting portion 31 is greater than the ring width of the first ring portion 321, indicating that the mounting portion 31 is closer to the outer edge of the base 32. Additionally, the radius of the through hole 30 is smaller than the ring width of the second ring portion 322.

[0028] In addition, as described above, the assembly part 31 has rounded corners, and the ring width of the assembly part 31 refers to the maximum distance between the outer ring surface 311 and the inner ring surface 313 of the assembly part 31.

[0029] The nozzle head 20 includes an upper end 23 and a lower end 24 that are assembled to each other. The upper end 23 is housed inside the hot nozzle body 10, and the lower end 24 protrudes from below the hot nozzle body 10. The heat insulation cap 3 is installed on the lower end 24.

[0030] In this embodiment, the nozzle head 20 also has a hollow cylindrical structure. Of course, if the nozzle head 20 has other structures, it is also within the protection scope of this utility model. The nozzle head 20 is connected to the lower part of the hot nozzle body 10. The second flow channel 202 and the first flow channel 101 are connected and interconnected, so that the molten rubber can flow from the first flow channel 101 of the hot nozzle body 10 to the second flow channel 202 of the nozzle head 20, and then controllably flow out from the gate 21 at the lower end 24 of the nozzle head 20 into the mold cavity. The heat insulation cap 3 is installed on the lower end 24 to isolate the heat of the lower end 24 during operation.

[0031] The hot nozzle assembly 100 also includes a locking washer 4, which surrounds the outer side of the nozzle head 20 and abuts against the hot nozzle body 10. Through the mating of the locking washer 4 and the hot nozzle body 10, the locking washer 4 and the hot nozzle body 10 abut against each other vertically, thereby preventing gaps at the mating position of the nozzle head 20 and the hot nozzle body 10, ensuring the quality of the plastic product. In this embodiment, the locking washer 4 and the outer side of the nozzle head 20 are connected by threads; however, other methods are also within the protection scope of this utility model.

[0032] This utility model also provides a hot runner system including the hot nozzle assembly 100 described above.

[0033] In summary, in this utility model, the hot nozzle assembly 100 includes a nozzle head 20 and a heat insulation cap 3 disposed on the end face of the nozzle head 20. The heat insulation cap 3 is made of a material with poor thermal conductivity, so when the hot nozzle assembly 100 comes into contact with the product, the temperature at the bottom of the heat insulation cap 3 is lower, and the high temperature of the nozzle head 20 is not easily conducted to the heat insulation cap 3. As a result, the temperature at the end of the hot nozzle assembly 100 will always be lower than the temperature that would burn the product, preventing the nozzle from burning the product, protecting the product, ensuring stable product quality, and improving product quality.

[0034] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementation methods or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A hot nozzle assembly, comprising a hot nozzle body extending along a coaxial axis and a nozzle head disposed inside the hot nozzle body, wherein the hot nozzle body is hollow and forms a first flow channel extending axially, the nozzle head is hollow and forms a second flow channel extending axially, the first flow channel and the second flow channel are connected, and the nozzle head forms a gate at the end of the second flow channel; characterized in that: The nozzle head has a contact surface surrounding the gate, and the gate protrudes downward from the contact surface; the hot nozzle body also includes a heat insulation cap installed on the contact surface, the heat insulation cap has a through hole along the axis, the gate is accommodated in the through hole, and the bottom of the heat insulation cap is flush with the end face of the gate.

2. The hot nozzle assembly according to claim 1, characterized in that, The contact surface of the mouth head is recessed inward to form an assembly groove. The heat insulation cap includes a base and an assembly part protruding upward from the base. The assembly part is adapted to the assembly groove.

3. The hot nozzle assembly according to claim 2, characterized in that, The assembly groove is a circular recess, and the assembly part is a circular protrusion.

4. The hot nozzle assembly according to claim 2, characterized in that, The bottom of the base is smooth.

5. The hot nozzle assembly according to claim 3, characterized in that, The assembly part includes an outer ring surface, a top surface, and an inner ring surface that extend sequentially, with an arc-shaped transition between the top surface and the outer ring surface, and between the top surface and the inner ring surface.

6. The hot nozzle assembly according to claim 3, characterized in that, The through hole is a round hole, and the assembly part and the through hole are coaxial.

7. The hot nozzle assembly according to claim 3, characterized in that, The base includes a first ring portion located at the outer edge of the assembly portion ring and a second ring portion located at the inner edge of the assembly portion ring, wherein the ring width of the assembly portion is smaller than the ring width of the second ring portion.

8. The hot nozzle assembly according to claim 1, characterized in that, The nozzle head includes an upper end and a lower end that are fitted together. The upper end is housed inside the hot nozzle body, and the lower end protrudes from below the hot nozzle body. The heat insulation cap is installed on the lower end.

9. The hot nozzle assembly according to claim 1, characterized in that, The hot nozzle assembly also includes a locking washer, which surrounds the outside of the nozzle head and abuts against the hot nozzle body.

10. A hot runner system, characterized in that, The hot runner system includes the hot nozzle assembly as described in any one of claims 1 to 9.

Images