Hot runner system with double valve needles

Abstract

The hot runner system comprises a two-stage air cylinder, an inner valve needle, an outer valve needle, a splitter plate and a hot nozzle, the two-stage air cylinder and the hot nozzle are connected to the upper surface and the lower surface of the splitter plate respectively, and the inner valve needle and the outer valve needle are connected to the first driving end and the second driving end of the two-stage air cylinder respectively. The outer valve needle is sleeved on the outer surface of the inner valve needle in an up-down sliding manner; a valve needle channel is arranged in the hot nozzle, a second rubber material outlet is formed in the valve needle channel in the vertical direction, a first rubber material outlet is formed in the outer side wall of the outer valve needle, the outer valve needle is used for controlling opening and closing of the second rubber material outlet, and the inner valve needle is used for controlling opening and closing of the first rubber material outlet. According to the scheme, the problem that the flexibility of the injection molding process is reduced to a certain extent due to the fact that in an existing hot runner system, the second rubber material outlet is firstly opened in the upward moving process of the valve needle, and then the first rubber material outlet is opened in the sequence that rubber materials in the first rubber material channel cannot be subjected to independent injection molding is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding technical field, concretely is a hot runner system with double valve needles. BACKGROUND

[0002] In the injection molding field, hot runner system is widely applied because of its efficient and accurate glue conveying capacity. A hot runner system is disclosed in the prior art, which comprises a hot nozzle and a valve needle. The hot nozzle is provided with a longitudinally extending valve needle channel, which provides a stable longitudinal motion environment for the valve needle. In addition, the inside of the hot nozzle is also provided with a first glue channel and a second glue channel, the first glue channel is responsible for the flow of the first color glue, and the second glue channel is responsible for the flow of the second color glue. The valve needle channel is provided with a first glue outlet and a second glue outlet along the longitudinal direction, the first glue outlet is located above the second glue outlet, the first glue outlet is communicated with the first glue channel, and the second glue outlet is communicated with the second glue channel. The valve needle controls the opening or closing of the first glue outlet and the second glue outlet by reciprocating upward and downward, so as to control the injection timing of the two different color glues, and finally form a gradual appearance effect by co-injection or sequential injection. However, in the hot runner system, the second glue outlet will be opened first, and then the first glue outlet will be opened during the upward movement of the valve needle. This sequence makes the glue in the second glue channel can be injected alone, and the glue in the first glue channel and the second glue channel can be injected at the same time, but the glue in the first glue channel cannot be injected alone, which limits the flexibility of the injection process to some extent. SUMMARY

[0003] In view of the above defects, the utility model provides a hot runner system with double valve needles, which aims to solve the problem that in the existing hot runner system, the second glue outlet will be opened first, and then the first glue outlet will be opened during the upward movement of the valve needle. This sequence makes the glue in the second glue channel can be injected alone, and the glue in the first glue channel and the second glue channel can be injected at the same time, but the glue in the first glue channel cannot be injected alone, which limits the flexibility of the injection process to some extent.

[0004] A hot runner system with double valve needles, comprising two-stage cylinder, inner valve needle, outer valve needle, flow divider and hot nozzle, the two-stage cylinder comprises first drive end and second drive end, the inside of the flow divider is provided with at least two flow divider flow channels;

[0005] The two-stage cylinder is connected to the upper surface of the flow distribution plate, the hot nozzle is connected to the lower surface of the flow distribution plate, one end of the inner valve needle is connected to the first driving end, one end of the outer valve needle is connected to the second driving end, the inner valve needle and the outer valve needle are arranged in an extending manner along the up-down direction, and the outer valve needle is sleeved on the outer surface of the inner valve needle in an up-down sliding manner.

[0006] The inner part of the hot nozzle is provided with a valve needle channel, a first glue channel and a second glue channel, the valve needle channel and the first glue channel are connected to one of the flow channels of the flow distribution plate, the second glue channel is connected to the other flow channel of the flow distribution plate, the valve needle channel is arranged in an extending manner along the up-down direction, and the other end of the inner valve needle and the outer valve needle is sequentially arranged in the flow distribution plate, the flow channel of the flow distribution plate connected to the valve needle channel and the valve needle channel.

[0007] The valve needle channel is provided with a second glue outlet in the up-down direction, the second glue outlet is connected to the second glue channel, at least one first glue outlet is formed in the outer side wall of the outer valve needle, the first glue outlet is connected to the first glue channel, the first glue outlet is located above the second glue outlet, the outer valve needle is used for controlling the opening and closing of the second glue outlet, and the inner valve needle is used for controlling the opening and closing of the first glue outlet.

[0008] Preferably, the hot nozzle comprises an outer nozzle body, an inner nozzle body and a nozzle core, the second glue channel comprises a glue inlet sub-channel, a transition sub-channel and a glue outlet sub-channel connected in sequence;

[0009] The transition sub-channel is arranged on the outer side wall of the inner nozzle body, the glue inlet sub-channel is arranged inside the side wall of the outer nozzle body, the first glue channel is formed between the inner wall of the inner nozzle body and the outer side wall of the outer valve needle, the nozzle core is connected to the bottom of the inner side wall of the outer nozzle body, the outer nozzle body and the nozzle core are sleeved on the outer side wall of the inner nozzle body, the inner wall of the nozzle core and the outer wall of the inner nozzle body form the glue outlet sub-channel, and the bottom of the nozzle core is provided with the second glue outlet.

[0010] Preferably, the transition sub-channel has a spiral structure.

[0011] Preferably, the total length of the outer valve needle accounts for

[0012] Preferably, the hot nozzle further comprises a color changing cap, and the color changing cap is detachably mounted on the bottom of the nozzle core.

[0013] Preferably, a first nozzle and a second nozzle are further included; the first nozzle is installed on the top of the distributor plate, and the second nozzle is installed on the side of the distributor plate, and the first nozzle and the second nozzle are respectively used to provide rubber material for corresponding distributor plate flow channels.

[0014] To achieve the above object, the utility model adopts the following technical scheme:

[0015] The technical scheme provided by the utility model can have the following beneficial effects:

[0016] In the scheme, the valve needle channel, the first rubber material channel and the second rubber material channel are arranged in the interior of the hot nozzle, the inner valve needle and the outer valve needle which can move up and down are arranged in the valve needle channel, the outer valve needle is sleeved on the outer surface of the inner valve needle and can slide up and down, the second rubber material outlet is formed on the valve needle channel in the up-down direction, the second rubber material outlet is communicated with the second rubber material channel, the first rubber material outlet is formed on the outer side wall of the outer valve needle, and the first rubber material outlet is communicated with the first rubber material channel. When the rubber material in the first rubber material channel needs to be separately injected, the inner valve needle can be separately controlled to move upwards, so that the first rubber material outlet on the outer side wall of the outer valve needle is opened. When the rubber material in the second rubber material channel needs to be separately injected, the outer valve needle can be separately controlled to move upwards, so that the second rubber material outlet is opened. When the rubber materials in the first rubber material channel and the second rubber material channel need to be simultaneously injected, the inner valve needle and the outer valve needle can be simultaneously controlled to move upwards, so that the first rubber material outlet and the second rubber material outlet are both opened. The scheme not only can realize the separate injection of the rubber material in the first rubber material channel and the rubber material in the second rubber material channel, but also can realize the co-injection of the rubber materials in the first rubber material channel and the second rubber material channel, and can effectively improve the flexibility in the injection process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a front view of a hot runner system with double valve needles;

[0018] Figure 2 is Figure 1 is a sectional view along the direction A-A in the

[0019] Figure 3 is a sectional view of one of the embodiments in the utility model.

[0020] Wherein, 1, two-stage cylinder; 2, inner valve needle; 3, outer valve needle; 4, flow distribution plate; 5, hot nozzle; 6, first nozzle; 7, second nozzle; 11, first driving end; 12, second driving end; 30, first glue outlet; 41, flow distribution plate flow channel; 50, valve needle channel; 51, first glue channel; 52, second glue channel; 53, outer nozzle body; 54, inner nozzle body; 55, nozzle core; 56, color changing cap; 500, second glue outlet; 521, glue inlet sub-channel; 522, transition sub-channel; 523, glue outlet sub-channel. DETAILED DESCRIPTION

[0021] The technical scheme of the utility model is further illustrated below in combination with the drawings and through specific embodiments.

[0022] In the description of the utility model, it needs to be understood that the directions or position relations indicated by the terms "length", "middle", "upper", "lower", "left", "right", "top", "bottom" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the utility model.

[0023] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0024] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "splicing", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] A hot runner system with double valve needles, comprising a two-stage cylinder 1, an inner valve needle 2, an outer valve needle 3, a flow distribution plate 4 and a hot nozzle 5, the two-stage cylinder 1 comprising a first driving end 11 and a second driving end 12, the flow distribution plate 4 being provided with at least two flow distribution plate flow channels 41 inside;

[0026] The two-stage cylinder 1 is connected to the upper surface of the flow distribution plate 4, the hot nozzle 5 is connected to the lower surface of the flow distribution plate 4, one end of the inner valve needle 2 is connected to the first driving end 11, one end of the outer valve needle 3 is connected to the second driving end 12, the inner valve needle 2 and the outer valve needle 3 are arranged in an up-down direction, and the outer valve needle 3 is sleeved on the outer surface of the inner valve needle 2 in an up-down sliding manner;

[0027] The inner part of the hot nozzle 5 is provided with a valve needle channel 50, a first glue channel 51 and a second glue channel 52, the valve needle channel 50 and the first glue channel 51 are communicated with one of the flow distribution plate flow channels 41, the second glue channel 52 is communicated with the other flow distribution plate flow channel 41, the valve needle channel 50 is arranged in an up-down direction, and the other end of the inner valve needle 2 and the outer valve needle 3 is sequentially arranged in the flow distribution plate 4, the flow distribution plate flow channel 41 communicated with the valve needle channel 50 and the valve needle channel 50;

[0028] The valve needle channel 50 is provided with a second glue outlet 500 in an up-down direction, the second glue outlet 500 is communicated with the second glue channel 52, at least one first glue outlet 30 is arranged on the outer wall of the outer valve needle 3, the first glue outlet 30 is communicated with the first glue channel 51, the first glue outlet 30 is located above the second glue outlet 500, the outer valve needle 3 is used for controlling the opening and closing of the second glue outlet 500, and the inner valve needle 2 is used for controlling the opening and closing of the first glue outlet 30.

[0029] In the scheme, a hot runner system with double valve needles is provided, in the embodiment, as shown in Figures 1-3As shown, the inner part of the flow distribution plate 4 is provided with two flow distribution plate flow channels 41, and the outer valve needle 3 is provided with three first glue outlets 30. The two flow distribution plate flow channels 41 are respectively filled with first color glue and second color glue. The first color glue flows into the first glue channel 51, and the second color glue flows into the second glue channel 52. In the initial state, the inner valve needle 2 blocks the first glue outlet 30, so that the first glue outlet 30 is in a closed state to ensure that the first color glue does not flow out. The outer valve needle 3 blocks the second glue outlet 500, so that the second glue outlet 500 is in a closed state to ensure that the second color glue does not flow out. When the first color glue needs to be injected, the two-stage cylinder 1 is started to drive the inner valve needle 2 to move upward. When the inner valve needle 2 moves to a preset position, the inner valve needle 2 opens the first glue outlet 30, and the first color glue enters the inner part of the outer valve needle 3 through the first glue outlet 30 and flows out of the hot nozzle 5 through the valve needle channel 50, thereby realizing separate injection of the first color glue. When the second color glue needs to be injected, the two-stage cylinder 1 is started to drive the outer valve needle 3 to move upward. When the outer valve needle 3 moves to a preset position, the outer valve needle 3 opens the second glue outlet 500, thereby realizing separate injection of the second color glue. When the first color glue and the second color glue need to be injected at the same time, the two-stage cylinder 1 is started to drive the inner valve needle 2 and the outer valve needle 3 to move upward at the same time. When the inner valve needle 2 and the outer valve needle 3 move to respective preset positions, the inner valve needle 2 opens the first glue outlet 30 and the outer valve needle 3 opens the second glue outlet 500, thereby realizing co-injection of the first color glue and the second color glue, and realizing the appearance effect of a product with a gradient color. The scheme can not only realize separate injection of glue in the first glue channel and glue in the second glue channel, but also realize co-injection of glue in the first glue channel and glue in the second glue channel, thereby effectively improving the flexibility in the injection process.

[0030] Preferably, the hot nozzle 5 includes an outer nozzle body 53, an inner nozzle body 54, and a nozzle core 55, and the second glue channel 52 includes a glue inlet sub-channel 521, a transition sub-channel 522, and a glue outlet sub-channel 523 connected in sequence.

[0031] The transition sub-channel 522 is arranged on the outer sidewall of the inner nozzle body 54, the glue inlet sub-channel 521 is arranged on the inner sidewall of the outer nozzle body 53, the inner wall of the inner nozzle body 54 and the outer sidewall of the outer valve needle 3 form the first glue channel 51, the nozzle core 55 is connected to the bottom of the inner sidewall of the outer nozzle body 53, the outer nozzle body 53 and the nozzle core 55 are sleeved on the outer sidewall of the inner nozzle body 54, the inner wall of the nozzle core 55 and the outer wall of the inner nozzle body 54 form the glue outlet sub-channel 523, and the bottom of the nozzle core 55 is provided with the second glue outlet 500.

[0032] In the embodiment, as shown in the figure, the inner wall of the inner nozzle body 54 and the outer sidewall of the outer valve needle 3 form the first glue channel 51, which is beneficial to ensure the stability of the flow of the first color glue. By arranging the second glue channel 52 which is sequentially connected by the glue inlet sub-channel 521, the transition sub-channel 522 and the glue outlet sub-channel 523, the flow path of the second color glue is effectively optimized, thereby reducing the residence time of the second color glue in the channel. Since the bottom of the nozzle core 55 is provided with the second glue outlet 500, the second color glue can be stably discharged. Figures 2-3 Preferably, the transition sub-channel 522 has a spiral structure. In the embodiment, since the transition sub-channel 522 has a spiral structure, it can provide a more smooth channel for glue flow, which helps to reduce the resistance of the glue in the flow process.

[0033] Preferably, the total length of the outer valve needle 3 accounts for 20%-30% of the total length of the inner valve needle 2.

[0034] Specifically, by limiting the range of the ratio of the total length of the outer valve needle 3 to the total length of the inner valve needle 2, the stability of the cooperative work of the outer valve needle 3 and the inner valve needle 2 is improved. If the outer valve needle 3 is too short, the outer valve needle 3 cannot fully complete the opening and closing of the second glue outlet 500; if the outer valve needle 3 is too long, the outer valve needle 3 does not have enough stroke on the inner valve needle 2 to control the opening and closing of the second glue outlet 500. Preferably, the heat nozzle 5 further comprises a color changing cap 56, which is detachably mounted on the bottom of the nozzle core 55. In the embodiment, as shown in the figure, when different colors or types of plastic materials need to be replaced during the injection molding process, the remaining materials at the bottom of the nozzle core 55 can be cleaned by detaching the color changing cap 5, so as to avoid color pollution or performance degradation caused by mixing of new and old materials.

[0035] Figure 2 Preferably, the heat nozzle 5 further comprises a color changing cap 56, which is detachably mounted on the bottom of the nozzle core 55. In the embodiment, as shown in the figure, when different colors or types of plastic materials need to be replaced during the injection molding process, the remaining materials at the bottom of the nozzle core 55 can be cleaned by detaching the color changing cap 5, so as to avoid color pollution or performance degradation caused by mixing of new and old materials.

[0036] ​Preferably, the first nozzle 6 and the second nozzle 7 are further included; the first nozzle 6 is installed on the top of the flow distribution plate 4, the second nozzle 7 is installed on the side of the flow distribution plate 4, and the first nozzle 6 and the second nozzle 7 are respectively used to provide the corresponding flow distribution plate flow channel 41 with the glue. In this embodiment, as shown in Figures 1-2 when double-color injection molding is needed, the first nozzle 6 and the second nozzle 7 can be started at the same time, the first nozzle 6 can provide one of the flow distribution plate flow channels 41 with the glue of the first color, and the second nozzle 7 can provide the other flow distribution plate flow channel 41 with the glue of the second color.

[0037] The technical principles of the present application are described above in combination with specific embodiments. These descriptions are only for explaining the principles of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the explanations herein, other specific embodiments of the present application can be conceived by those skilled in the art without creative labor, and these embodiments will all fall within the protection scope of the present application.

Claims

1. A hot runner system with dual valve needles, characterized in that: It includes a two-stage cylinder, an inner valve needle, an outer valve needle, a manifold, and a hot nozzle. The two-stage cylinder includes a first driving end and a second driving end. The manifold has at least two manifold channels inside. The two-stage cylinder is connected to the upper surface of the manifold, the hot nozzle is connected to the lower surface of the manifold, one end of the inner valve needle is connected to the first drive end, one end of the outer valve needle is connected to the second drive end, the inner valve needle and the outer valve needle both extend in the vertical direction, and the outer valve needle is slidably sleeved on the outer surface of the inner valve needle. The hot nozzle is internally provided with a valve needle channel, a first adhesive channel and a second adhesive channel. The valve needle channel and the first adhesive channel are both connected to one of the flow divider channels. The second adhesive channel is connected to the other flow divider channel. The valve needle channel extends through the nozzle in the vertical direction. The other ends of the inner valve needle and the outer valve needle are sequentially inserted into the flow divider, the flow divider channel connected to the valve needle channel and the valve needle channel. The valve needle channel has a second adhesive outlet along the vertical direction, and the second adhesive outlet is connected to the second adhesive channel. The outer side wall of the outer valve needle has at least one first adhesive outlet, which is connected to the first adhesive channel. The first adhesive outlet is located above the second adhesive outlet. The outer valve needle is used to control the opening and closing of the second adhesive outlet, and the inner valve needle is used to control the opening and closing of the first adhesive outlet.

2. A hot runner system with dual valve needles according to claim 1, characterized in that: The hot nozzle includes an outer nozzle body, an inner nozzle body, and a nozzle core; the second rubber material channel includes a rubber inlet channel, a transition channel, and a rubber outlet channel connected in sequence. The transition sub-channel is disposed on the outer side wall of the inner nozzle body, the glue inlet channel is disposed inside the side wall of the outer nozzle body, the inner wall of the inner nozzle body and the outer side wall of the outer valve needle form the first glue channel, the nozzle core is connected to the bottom of the inner side wall of the outer nozzle body, the outer nozzle body and the nozzle core are both sleeved on the outer side wall of the inner nozzle body, the inner wall of the nozzle core and the outer wall of the inner nozzle body form the glue outlet channel, and the bottom of the nozzle core is provided with the second glue outlet.

3. A hot runner system with dual valve needles according to claim 2, characterized in that: The transition subchannel has a spiral structure.

4. A hot runner system with dual valve needles according to claim 1, characterized in that: The ratio of the total length of the outer valve needle to the total length of the inner valve needle is .

5. A hot runner system with dual valve needles according to claim 2, characterized in that: The hot nozzle also includes a color-changing cap, which is detachably installed at the bottom of the nozzle core.

6. A hot runner system with dual valve needles according to claim 1, characterized in that: It also includes the first and second gun barrels; The first nozzle is installed on the top of the manifold, and the second nozzle is installed on the side of the manifold. The first nozzle and the second nozzle are respectively used to provide adhesive to the corresponding manifold channels.

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