Hot nozzle assembly and hot runner system comprising same

Abstract

The utility model discloses a hot nozzle assembly and a hot runner system comprising the same. The hot nozzle assembly comprises a hot nozzle body and a nozzle head part which are fixedly connected with each other, the interior of the hot nozzle body is hollow and is provided with a first runner extending longitudinally, the interior of the nozzle head part is hollow and is provided with a second runner extending longitudinally, and the first runner is communicated with the second runner; the nozzle head part comprises a blocking part, the blocking part is located in the second flow channel and divides the second flow channel into an upper flow channel and a lower flow channel, and the upper flow channel is communicated with the lower flow channel. When the molten material flows from the second runner to the first runner, the molten material is blocked by the blocking part, so that the cross section of the molten material changes and is suddenly reduced. And therefore, the condition of wire drawing of the material handle is prevented. Moreover, a nozzle tip structure in a common structure is omitted, so that the cost is further reduced.

Description

Hot nozzle assembly and hot runner system including it 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 comprises a nozzle body and a nozzle head. Molten plastic flows from the nozzle body through the nozzle head into the mold cavity. In the prior art, to control the rate of molten plastic during discharge and to help break up the molten plastic at the gate and prevent stringing, a tip is usually provided inside the nozzle head. This tip is conical with a narrower lower diameter, so that the molten plastic breaks up as it passes through due to the change in the cross-section it passes through.

[0004] However, in this case, the nozzle structure is intricate and the price is too high, thus making the price of this type of hot runner nozzle also too high. Summary of the Invention

[0005] To address the technical problems in the prior art, the purpose of this utility model is to provide a lower-cost hot runner assembly and a hot runner system including the same.

[0006] To achieve one of the above-mentioned objectives of the utility model, one embodiment of the utility model provides a hot nozzle assembly, including a hot nozzle body and a nozzle head fixedly connected to each other. The hot nozzle body is hollow inside and has a longitudinally extending first flow channel. The nozzle head is hollow inside and has a longitudinally extending second flow channel. The first flow channel and the second flow channel are connected. The nozzle head includes a blocking part, which is located inside the second flow channel and divides the second flow channel into an upper flow channel and a lower flow channel. The upper flow channel and the lower flow channel are connected.

[0007] As a further improvement of one embodiment of the present invention, the mouth head is provided with a transverse channel extending radially, the transverse channel being connected to the second flow channel, and the blocking part being located within the transverse channel.

[0008] As a further improvement of one embodiment of the present invention, the hot nozzle assembly includes a pin, the pin being inserted through the transverse channel and having a length not greater than the length of the transverse channel; the blocking portion is located on the pin.

[0009] As a further improvement of one embodiment of the present invention, the insert extends radially along the second flow channel.

[0010] As a further improvement of one embodiment of the present invention, the insert pin is cylindrical and its diameter is smaller than that of the second flow channel.

[0011] As a further improvement of one embodiment of the present invention, the radius of the second flow channel is larger than the diameter of the insert pin.

[0012] As a further improvement of one embodiment of the present invention, the two ends of the insert are welded to the outer surface of the mouth head.

[0013] As a further improvement of one embodiment of the present invention, the radial direction of the lower flow channel gradually increases from top to bottom.

[0014] As a further improvement of one embodiment of the present invention, the hot nozzle assembly further includes a locking washer, the locking member surrounding the outside of the nozzle head and abutting against the hot nozzle body.

[0015] To achieve one of the above-mentioned objectives of the utility model, one embodiment of the utility model provides a hot runner system, the hot runner system including the hot nozzle assembly.

[0016] Compared with the prior art, this utility model has the following advantages: The blocking part is located in the second flow channel of the nozzle tip, and the upper and lower flow channels are connected. Thus, the blocking part functions to block the molten material. When the molten material flows from the second flow channel to the first flow channel, it is blocked by the blocking part, causing a change in the cross-section of the molten material, which suddenly narrows. This breaks the molten material apart, preventing stringing on the stalk. Furthermore, this utility model eliminates the nozzle tip structure found in conventional structures, further reducing costs. Attached Figure Description

[0017] Figure 1 is a perspective structural diagram of a hot nozzle assembly according to an embodiment of the present invention;

[0018] Figure 2 is a longitudinal sectional view of a hot nozzle assembly according to an embodiment of the present invention;

[0019] Figure 3 is an enlarged view of the circled area in Figure 2;

[0020] Figure 4 is a three-dimensional structural diagram of the mouth head according to an embodiment of the present invention.

[0021] Figure 5 is a schematic diagram of the bottom surface of a hot nozzle assembly according to an embodiment of the present invention. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0023] Referring to Figures 1 to 5, an embodiment of the present invention 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 valve needle type hot runner system, which includes a manifold assembly, a hot nozzle assembly 100, a valve needle, and a driving device.

[0024] A hot runner assembly 100 is assembled onto the manifold assembly, and both the manifold assembly and the hot runner assembly 100 have hot runner channels for the flow of molten plastic material. The hot runner channels include a distribution channel formed within the manifold assembly and a transport channel formed within the hot runner assembly 100, wherein: the distribution channel has an inlet adapted to the injection molding machine nozzle and at least one outlet; the hot runner assembly 100 is assembled at the outlet of the distribution channel; the transport channel is fluidly connected to the distribution channel and has a gate corresponding to the mold cavity.

[0025] In this utility model, the hot nozzle assembly 100 specifically includes a hot nozzle body 10 and a nozzle head 20. The hot nozzle body 10 is hollow inside and has a longitudinally extending first flow channel 1. The nozzle head 20 is hollow inside and has a longitudinally extending second flow channel 2. The first flow channel 1 and the second flow channel 2 are connected. The nozzle head 20 includes a blocking part 31. The blocking part 31 is located inside the second flow channel 2 and divides the second flow channel 2 into an upper flow channel 21 and a lower flow channel 22. The upper flow channel 21 and the lower flow channel 22 are connected.

[0026] The hot nozzle body 10 has a hollow cylindrical structure with a first flow channel 1 formed inside. The hot nozzle body 10 is generally elongated tubular, and the inner wall of the hot nozzle body 10 surrounds at least part of the first flow channel 1. The first flow channel 1 is seamlessly connected to the dispensing port of the dispensing channel and forms the upstream section of the transport channel, that is, the molten adhesive in the dispensing channel can flow directly into the first flow channel 1.

[0027] 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. A second flow channel 2 is formed inside the nozzle head 20. The nozzle head 20 includes an upper end 23 and a lower end 24. The upper end 23 is accommodated inside the hot nozzle body 10, and the lower end 24 protrudes from below the hot nozzle body 10. The nozzle head 20 is connected to the lower part of the hot nozzle body 10. The second flow channel 2 and the first flow channel 1 are connected and connected, so that the molten material can flow from the first flow channel 1 of the hot nozzle body 10 to the second flow channel 2 of the nozzle head 20, and then controllably flow out from the gate at the lower end 24 of the nozzle head 20 into the mold cavity. Of course, the first flow channel 1 and the second flow channel 2 are combined to form the conveying channel as described above.

[0028] The nozzle head 20 includes a blocking part 31 located within the second flow channel 2 of the nozzle head 20, with the upper flow channel 21 and lower flow channel 22 connected. Thus, the blocking part 31 serves to block the molten material. When the molten material flows from the second flow channel 2 to the first flow channel 1, it is blocked by the blocking part 31, causing a change in the cross-section of the molten material, resulting in a sudden reduction in size. This breaks the molten material apart, preventing stringing. Furthermore, this invention eliminates the nozzle tip structure found in conventional structures, further reducing costs.

[0029] Furthermore, the mouth head 20 is provided with a transverse channel 201 extending radially through it, the transverse channel 201 being connected to the second flow channel 2, and the blocking part 31 being located within the transverse channel 201.

[0030] In this embodiment, the blocking part 31 is fixed within the transverse channel 201, thereby at least partially blocking the second flow channel 2. Of course, if the transverse channel 201 is not radially through-type, but rather inclined, bent, or otherwise arranged, as long as it can connect to the second flow channel 2 and fix the blocking part 31, the purpose of this invention can be achieved. On the other hand, if the mouthpiece 20 does not have a transverse channel 201, but instead has other structures to fix the blocking part 31, the purpose of this invention can also be achieved.

[0031] Specifically, in this embodiment, the hot nozzle assembly 100 includes a pin 3, which passes through the transverse channel 201 and its length is not greater than the length of the transverse channel 201; the blocking part 31 is located on the pin 3.

[0032] The insert pin 3 is elongated and can be accommodated within the transverse channel 201. The blocking part 31 is located at the middle of the insert pin 3, corresponding precisely to the second flow channel 2. The length of the insert pin 3 is less than or equal to the length of the transverse channel 201, so that it can be accommodated precisely within the transverse channel 201. In this specific embodiment, the length of the insert pin 3 is slightly less than the length of the transverse channel 201.

[0033] Of course, the diameter of the insert 3 is not greater than the inner diameter of the transverse channel 201. In this specific embodiment, the diameter of the insert 3 is the same as the inner diameter of the transverse channel 201, so that the insert 3 is connected to the transverse channel 201 in a tight fit to prevent molten material from flowing out of the transverse channel 201.

[0034] As shown in Figure 5, the insert pin 3 extends radially along the second flow channel 2. Thus, the insert pin 3 passes radially through the second flow channel 2, and on the cross-section of the second flow channel 2, the insert pin 3 can divide the second flow channel 2 equally into two parts. When the molten material passes through, it will also be divided into two parts due to the presence of the insert pin 3, thereby helping the molten material at the gate to break apart.

[0035] Of course, if the insert 3 does not pass radially through the second flow channel 2, but passes through other parts of the second flow channel 2, as long as it can reduce the cross-section of the second flow channel 2, the purpose of this utility model can be achieved. Alternatively, the insert 3 can be a multi-structure, so that the blocking part 31 is generally grid-shaped and divides the cross-section of the second flow channel 2 at this point, thereby reducing the cross-section of the second flow channel 2 at this point, while not hindering the passage of molten material, which can also achieve the purpose of this utility model.

[0036] The insert 3 is cylindrical, and its diameter is smaller than that of the second flow channel 2. Of course, the cross-section of the insert 3 can also be square or other irregular shapes, as long as it can fit the transverse channel 201. Furthermore, in order to ensure that the upper flow channel 21 and the lower flow channel 22 are connected without affecting the flow of molten material, the diameter of the insert 3 is smaller than that of the second flow channel 2.

[0037] Furthermore, as shown in Figure 5, the radius of the second flow channel 2 is larger than the diameter of the insert pin 3. The insert pin 3 is thinner than the second flow channel 2, which is thicker. Thus, the blocking part 31 of the insert pin 3 functions to divide the molten material without affecting its flow and preventing accumulation.

[0038] As described above, the length of the insert 3 is shorter than that of the transverse channel 201. Specifically, both ends of the insert 3 are welded to the outer surface of the mouthpiece 20. Corresponding to the transverse channel 201, the outer surface of the mouthpiece 20 has two recessed welding spaces 202. After the insert 3 is placed into the transverse channel 201, it is welded in the welding spaces 202 to fix it inside the mouthpiece 20. The welding spaces 202 can accommodate solder, so that after welding, the solder will not protrude from the outer surface of the mouthpiece 20, resulting in a more aesthetically pleasing appearance.

[0039] The blocking part 31 is located between the upper flow channel 21 and the lower flow channel 22, and the radial direction of the lower flow channel 22 gradually increases from top to bottom. Specifically, the upper flow channel 21 is cylindrical in shape and its inner diameter is the same from top to bottom, while the lower flow channel 22 is conical in shape and its inner diameter increases sequentially from top to bottom. Of course, the inner diameter of the uppermost side of the lower flow channel 22 is the same as the inner diameter of the upper flow channel 21. As mentioned above, the radius of the second flow channel 2 is larger than the diameter of the insert pin 3, that is, the radius of the narrowest part of the second flow channel 2 is larger than the diameter of the insert pin 3.

[0040] Of course, the hot nozzle assembly 100 also includes a locking washer 4, which surrounds the outside 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 outside of the nozzle head 20 are connected by threads; however, other methods are also within the protection scope of this utility model.

[0041] Compared with the prior art, the hot nozzle assembly 100 and the hot runner system having the hot nozzle assembly 100 of this utility model have the following beneficial effects: The blocking part 31 is located in the second runner 2 of the nozzle head 20, and the upper runner 21 and the lower runner 22 are connected. Thus, the blocking part 31 serves to block the molten material. When the molten material flows from the second runner 2 to the first runner 1, it is blocked by the blocking part 31, causing the cross-section of the molten material to change and suddenly shrink. This breaks the molten material, preventing stringing. Furthermore, this utility model eliminates the nozzle tip structure found in conventional structures, further reducing costs.

[0042] 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 and a nozzle head fixedly connected to each other, wherein the hot nozzle body is hollow and has a longitudinally extending first flow channel, and the nozzle head is hollow and has a longitudinally extending second flow channel, the first flow channel and the second flow channel being connected; characterized in that, The nozzle head includes a blocking part, which is located in the second flow channel and divides the second flow channel into an upper flow channel and a lower flow channel, which are connected to each other.

2. The hot nozzle assembly according to claim 1, characterized in that, The nozzle head is provided with a transverse channel extending radially through it, the transverse channel being connected to the second flow channel, and the blocking part being located within the transverse channel.

3. The hot nozzle assembly according to claim 2, characterized in that, The hot nozzle assembly includes a pin that passes through the transverse channel and whose length is not greater than the length of the transverse channel; the blocking portion is located on the pin.

4. The hot nozzle assembly according to claim 3, characterized in that, The insert extends radially along the second flow channel.

5. The hot tip assembly of claim 3, wherein The insert is cylindrical and its diameter is smaller than that of the second flow channel.

6. The hot tip assembly of claim 5, wherein, The radius of the second flow channel is larger than the diameter of the insert pin.

7. The hot nozzle assembly according to claim 3, characterized in that, The two ends of the insert are welded to the outer surface of the mouth head.

8. The hot nozzle assembly according to claim 1, characterized in that, The radial direction of the lower flow channel gradually increases from top to bottom.

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

Images