Hot runner nozzle capable of injecting two cavities through single nozzle

Abstract

The utility model discloses a single-nozzle two-cavity hot runner nozzle and relates to the technical field of nozzle equipment. The rear end of the nozzle core is connected with the front end of the hot nozzle sleeve, the rear end of the hot nozzle sleeve is connected with the front end of the hot nozzle sleeve bottom plate, a valve needle is arranged in the nozzle core, penetrates through the hot nozzle sleeve and extends into the hot nozzle sleeve bottom plate, a needle cylinder is arranged on the connecting portion of the hot nozzle sleeve and the hot nozzle sleeve bottom plate, a piston plate and a valve needle clamping plate are arranged at the tail end of the needle cylinder, and the piston plate and the valve needle clamping plate are connected with the tail end of the valve needle. A flow dividing groove is formed in an outlet in the front end of the nozzle core, a flow dividing valve needle head is arranged at the tail end of the valve needle and matched with the flow dividing groove, the flow dividing groove is formed in a nozzle core opening and matched with the valve needle with the inclined face to form two sprues, and when the piston plate drives the valve needle to move under the pressure effect, simultaneous operation can be conducted from the two sprues. And a plurality of cavities can be matched for multi-color injection molding, so that the use quantity of the hot nozzles is effectively reduced, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to a single-nozzle, two-chamber hot runner nozzle, and relates to the field of nozzle equipment technology. Background Technology

[0002] In the injection molding process of small products, multi-cavity arrangement and hot runner nozzles are required. Traditional needle valve hot nozzles require one hot nozzle for each cavity, which leads to tight mold space, the need to use more hot nozzles, and higher mold costs.

[0003] In addition, in traditional multi-color one-piece molding molds, each cavity requires a hot nozzle, so the mold is also a two-color two-cavity or three-color three-cavity mold, which is inefficient. Therefore, a hot runner nozzle with a single nozzle for two cavities is proposed to solve the problems existing in the prior art. Utility Model Content

[0004] The purpose of this invention is to address the deficiencies or shortcomings in the existing technology by providing a hot runner nozzle with a single nozzle and two cavities. By setting a flow divider groove at the nozzle core and cooperating with a valve needle with an inclined surface to form two gates, the piston plate can drive the valve needle to move under pressure, allowing simultaneous operation from both gates. It can also be used with multiple cavities for multi-color injection molding, thereby effectively reducing the number of hot nozzles used and lowering production costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: It includes a nozzle core 1, a heating nozzle sleeve 3, and a heating nozzle sleeve base plate 4. The rear end of the nozzle core 1 is connected to the front end of the heating nozzle sleeve 3, and the rear end of the heating nozzle sleeve 3 is connected to the front end of the heating nozzle sleeve base plate 4. A valve needle 6 is provided inside the nozzle core 1, penetrating the heating nozzle sleeve 3 and extending into the heating nozzle sleeve base plate 4. A syringe 7 is provided at the connection between the heating nozzle sleeve 3 and the heating nozzle sleeve base plate 4. A piston plate 8 and a valve needle retaining plate 9 are provided at the end of the syringe 7. The piston plate 8 and the valve needle retaining plate 9 are connected to the end of the valve needle 6. A flow divider groove 1-1 is provided at the front outlet of the nozzle core 1, and a flow divider valve needle 6-1 is provided at the end of the valve needle 6 to match the flow divider groove 1-1.

[0006] Furthermore, the nozzle core 1 has an inclined diversion surface 1-2 at its front end outlet.

[0007] Furthermore, the end of the diversion valve needle 6-1 is provided with an inclined surface that matches the diversion surface 1-2, and the slope of the inclined surface is greater than the slope of the diversion surface 1-2. The diversion valve needle 6-1 and the diversion surface 1-2 form the first gate 12 and the second gate 13.

[0008] Furthermore, the valve needle 6 is provided with a retaining plate groove 6-2 at its tail.

[0009] Furthermore, the valve needle retainer plate 9 is symmetrically arranged in two pieces, and a retainer plate protrusion 9-1 is provided on the inner side, which engages with the retainer plate groove 6-2.

[0010] Furthermore, a first flow channel 3-1 is provided on one side of the hot nozzle sleeve 3. The first flow channel 3-1 is inclined and the outlet end is located at the front end of the syringe 7.

[0011] Furthermore, the hot nozzle sleeve base plate 4 is provided with a feed inlet 4-1 at the middle of its end, and a second flow channel 4-2 is provided and connected to the feed inlet 4-1. The second flow channel 4-2 is inclined and its outlet end is connected to the inlet end of the first flow channel 3-1. The hot nozzle sleeve base plate 4 is also provided with a positioning ring 5 at its end, and the positioning ring 5 has an opening in the middle that is connected to the feed inlet 4-1.

[0012] Furthermore, a pressure chamber 4-5 is provided on the front end of the hot nozzle base plate 4 opposite to the feed port 4-1, and the end of the pressure chamber 4-5 is a stepped structure. A first air passage 4-3 is provided on one side of the stepped structure, and a second air passage 4-4 is provided near the opening of the pressure chamber 4-5.

[0013] Furthermore, the outer wall of the hot nozzle sleeve 3 is provided with a thermocouple assembly 10, the thermocouple assembly 10 is provided with a temperature sensing wire 11, and the hot nozzle sleeve 3 is covered with a thermocouple cover 2.

[0014] Furthermore, the syringe 7 is provided with a limiting plate 7-1 at its end, and an extension end 7-2 is provided on one side of the limiting plate 7-1. The limiting plate 7-1 abuts against the front surface of the hot nozzle sleeve base plate 4, and the extension end 7-2 is tightly connected to the pressure chamber 4-5.

[0015] The working principle of this utility model is as follows: When no operation is being performed, the second air passage 4-4 is ventilated. Under pressure, the piston plate 8 is pushed to move the valve needle 6 backward. The valve needle retainer 9 abuts against the end face of the step of the pressure chamber 4-5. At this time, the diversion valve needle head 6-1 blocks the outlet of the nozzle core 1 and closes the diversion groove 1-1. When operation is being performed, the first air passage 4-3 is ventilated. Under pressure, the valve needle retainer 9 and the piston plate 8 are pushed to move the valve needle 6 forward. The diversion valve needle head 6-1 leaves the diversion surface 1-2 and exposes the first gate 12 and the second gate 13. The raw material is injected from the positioning ring 5, enters the first channel 3-1 from the second channel 4-2, is injected into the hot nozzle sleeve 3 from the front end of the syringe 7, and is injected into the mold cavity from the first gate 12 and the second gate 13, achieving the effect of single-nozzle injection into two cavities.

[0016] After adopting the above technical solution, the beneficial effects of this utility model are as follows: by setting a flow divider groove at the nozzle core opening and cooperating with the valve needle with an inclined surface to form two gates, when the piston plate drives the valve needle to move under pressure, it can operate simultaneously from the two gates, and can cooperate with multiple cavities to perform multi-color injection molding, thereby effectively reducing the number of hot nozzles used and reducing production costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 yes Figure 1 Sectional view along the AA direction;

[0020] Figure 3 yes Figure 2 Enlarged structural diagram at point B;

[0021] Figure 4 yes Figure 2 Schematic diagram of the structure of the nozzle core 1;

[0022] Figure 5 This is a schematic diagram of the cooperation state between the piston plate 8 and the valve needle retaining plate 9 in this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the heating nozzle sleeve base plate 4 in this utility model;

[0024] Figure 7 This is a schematic diagram of the valve needle 6 in this utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the syringe 7 in this utility model;

[0026] Figure 9 This is a schematic diagram of the gate opening state of this utility model.

[0027] Explanation of reference numerals in the attached drawings: Nozzle core 1, thermocouple cover 2, hot nozzle sleeve 3, hot nozzle sleeve base plate 4, positioning ring 5, valve needle 6, syringe 7, piston plate 8, valve needle retaining plate 9, thermocouple assembly 10, temperature sensing wire 11, first gate 12, second gate 13, flow divider 1-1, flow divider surface 1-2, first flow channel 3-1, feed inlet 4-1, second flow channel 4-2, first air passage 4-3, second air passage 4-4, pressure chamber 4-5, flow divider valve needle 6-1, retaining plate groove 6-2, limiting plate 7-1, extension end 7-2. Detailed Implementation

[0028] See Figures 1-9 As shown, the technical solution adopted in this specific embodiment is as follows: It includes a nozzle core 1, a heating nozzle sleeve 3, and a heating nozzle sleeve base plate 4. The rear end of the nozzle core 1 is connected to the front end of the heating nozzle sleeve 3, and the rear end of the heating nozzle sleeve 3 is connected to the front end of the heating nozzle sleeve base plate 4. A valve needle 6 is provided inside the nozzle core 1, penetrating the heating nozzle sleeve 3 and extending into the heating nozzle sleeve base plate 4. A syringe 7 is provided at the connection between the heating nozzle sleeve 3 and the heating nozzle sleeve base plate 4. A piston plate 8 and a valve needle retaining plate 9 are provided at the end of the syringe 7. The piston plate 8 and the valve needle retaining plate 9 are connected to the end of the valve needle 6. A flow divider groove 1-1 is provided at the front outlet of the nozzle core 1, and a flow divider valve needle head 6-1 is provided at the end of the valve needle 6 to match the flow divider groove 1-1. In this embodiment, the piston plate and the valve needle retaining plate are connected, and the valve needle retaining plate is connected to the valve needle so that the piston plate can drive the valve needle. The nozzle moves back and forth, and a flow divider is provided at the front outlet of the nozzle core. The flow divider valve needle matches the flow divider and seals it. The front outlet of the nozzle core 1 is provided with an inclined flow divider surface 1-2. The end of the flow divider valve needle 6-1 is provided with an inclined surface that matches the flow divider surface 1-2, and the slope of the inclined surface is greater than that of the flow divider surface 1-2. The flow divider valve needle 6-1 and the flow divider surface 1-2 form the first gate 12 and the second gate 13. During injection, the piston plate drives the valve needle to move towards the outlet end, releasing the seal on the flow divider and exposing the first gate and the second gate. The material can then be injected into the cavity from the two gates, thus achieving the effect of injecting into two cavities with a single nozzle. This reduces the number of hot nozzles and lowers production costs when the number of cavities is the same.

[0029] More specifically, the valve needle 6 is provided with a retaining plate groove 6-2 at its tail, and two valve needle retaining plates 9 are symmetrically arranged, with retaining plate protrusions 9-1 on the inner side. The retaining plate protrusions 9-1 and retaining plate groove 6-2 engage with each other. The separate valve needle retaining plates make it easier to connect and install with the valve needle. The cooperation between the retaining plate protrusions and the retaining plate grooves can drive the movement of the valve needle to open and close the gate.

[0030] More specifically, the hot nozzle sleeve 3 is provided with a first flow channel 3-1 on one side. The first flow channel 3-1 is inclined and the outlet end is located at the front end of the syringe 7. The hot nozzle sleeve is provided with an inclined first flow channel, one end of which is the inlet end and the other end is the outlet end. The outlet end is located at the front end of the syringe, which facilitates the glue to enter the hot nozzle sleeve during glue injection.

[0031] More specifically, the bottom plate 4 of the hot nozzle sleeve is provided with a feed inlet 4-1 at the middle of its end, and a second flow channel 4-2 is provided and connected to the feed inlet 4-1. The second flow channel 4-2 is inclined and its outlet end is connected to the inlet end of the first flow channel 3-1. The bottom plate 4 of the hot nozzle sleeve is also provided with a positioning ring 5 at its end. The positioning ring 5 has an opening in its middle and is connected to the feed inlet 4-1. When injecting glue, the glue enters the second flow channel from the positioning ring, then enters the first flow channel, and then enters the hot nozzle sleeve.

[0032] More specifically, a pressure chamber 4-5 is provided on the front end of the hot nozzle base plate 4 opposite to the feed port 4-1, and the end of the pressure chamber 4-5 has a stepped structure. A first air passage 4-3 is provided on one side of the stepped structure, and a second air passage 4-4 is provided near the opening of the pressure chamber 4-5. In this embodiment, the first air passage is the opening end for glue injection. When air is introduced, the air pressure pushes the piston plate to move the valve needle to the opening end, opening the gate. When the gate needs to be closed, air is injected into the second air passage, and the air pressure pushes the piston plate to move to the rear end, moving the valve needle backward to block the diversion groove and close the gate. The overall response is rapid, the opening and closing speed is fast, and the glue injection efficiency is higher.

[0033] More specifically, the outer wall of the hot nozzle sleeve 3 is provided with a thermocouple assembly 10, and a temperature sensing wire 11 is provided on the thermocouple assembly 10. The hot nozzle sleeve 3 is covered with a thermocouple cover 2. The thermocouple assembly is used to heat the interior and the temperature is measured by the temperature sensing wire to ensure that the glue injection temperature is normal. Both the thermocouple assembly and the temperature sensing wire are electrically connected to the control center.

[0034] More specifically, the syringe 7 is provided with a limiting plate 7-1 at its end, and an extension end 7-2 is provided on one side of the limiting plate 7-1. The limiting plate 7-1 abuts against the front surface of the hot nozzle sleeve base plate 4, and the extension end 7-2 is tightly connected to the pressure chamber 4-5. In this embodiment, the limiting plate is used for positioning, and the extension end is connected to the pressure chamber. When the injection gate is opened, the piston plate will abut against the extension end to prevent excessive movement, thereby ensuring the opening and closing degree of the injection gate.

[0035] The working principle of this utility model is as follows: When no operation is being performed, the second air passage 4-4 is ventilated. Under pressure, the piston plate 8 is pushed to move the valve needle 6 backward. The valve needle retainer 9 abuts against the end face of the step of the pressure chamber 4-5. At this time, the diversion valve needle head 6-1 blocks the outlet of the nozzle core 1 and closes the diversion groove 1-1. When operation is being performed, the first air passage 4-3 is ventilated. Under pressure, the valve needle retainer 9 and the piston plate 8 are pushed to move the valve needle 6 forward. The diversion valve needle head 6-1 leaves the diversion surface 1-2 and exposes the first gate 12 and the second gate 13. The raw material is injected from the positioning ring 5, enters the first channel 3-1 from the second channel 4-2, is injected into the hot nozzle sleeve 3 from the front end of the syringe 7, and is injected into the mold cavity from the first gate 12 and the second gate 13, achieving the effect of single-nozzle injection into two cavities.

[0036] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A single-nozzle, two-chamber hot runner nozzle, characterized in that: It includes a nozzle core (1), a hot nozzle sleeve (3), and a hot nozzle sleeve base plate (4). The rear end of the nozzle core (1) is connected to the front end of the hot nozzle sleeve (3), and the rear end of the hot nozzle sleeve (3) is connected to the front end of the hot nozzle sleeve base plate (4). A valve needle (6) is provided inside the nozzle core (1), which penetrates the hot nozzle sleeve (3) and extends into the hot nozzle sleeve base plate (4). A syringe (7) is provided at the connection between the hot nozzle sleeve (3) and the hot nozzle sleeve base plate (4). A piston plate (8) and a valve needle retainer plate (9) are provided at the end of the syringe (7). The piston plate (8) and the valve needle retainer plate (9) are connected to the end of the valve needle (6). A diversion groove (1-1) is provided at the front end outlet of the nozzle core (1), and a diversion valve needle (6-1) is provided at the end of the valve needle (6) to match the diversion groove (1-1).

2. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The nozzle core (1) has an inclined flow divider surface (1-2) at its front end outlet.

3. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The end of the diversion valve needle (6-1) is provided with an inclined surface that matches the diversion surface (1-2), and the slope of the inclined surface is greater than the slope of the diversion surface (1-2). The diversion valve needle (6-1) and the diversion surface (1-2) form the first gate (12) and the second gate (13).

4. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The valve needle (6) is provided with a retaining plate groove (6-2) at its tail.

5. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The valve needle retainer (9) is symmetrically arranged in two pieces, and a retainer protrusion (9-1) is provided on the inner side, which engages with the retainer groove (6-2).

6. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The hot nozzle sleeve (3) is provided with a first flow channel (3-1) on one side. The first flow channel (3-1) is inclined and the outlet end is located at the front end of the syringe (7).

7. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The hot nozzle sleeve base plate (4) is provided with a feed inlet (4-1) at the middle of its end, and a second flow channel (4-2) is provided and connected to the feed inlet (4-1). The second flow channel (4-2) is inclined and the outlet end of the second flow channel (4-2) is connected to the inlet end of the first flow channel (3-1). The hot nozzle sleeve base plate (4) is also provided with a positioning ring (5) at its end. The positioning ring (5) has an opening in the middle and is connected to the feed inlet (4-1).

8. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The front end of the hot nozzle base plate (4) is provided with a pressure chamber (4-5) on the side opposite to the feed port (4-1), and the end of the pressure chamber (4-5) is a stepped structure. A first air passage (4-3) is provided on one side of the stepped structure, and a second air passage (4-4) is provided near the opening of the pressure chamber (4-5).

9. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The outer wall of the hot nozzle sleeve (3) is provided with a thermocouple assembly (10), a temperature sensing wire (11) is provided on the thermocouple assembly (10), and a thermocouple cover (2) is provided on the outer sleeve of the hot nozzle sleeve (3).

10. A single-nozzle, two-chamber hot runner nozzle according to claim 1, characterized in that: The syringe (7) is provided with a limiting plate (7-1) at the end. An extension end (7-2) is provided on one side of the limiting plate (7-1). The limiting plate (7-1) abuts against the front surface of the hot nozzle sleeve base plate (4). The extension end (7-2) is tightly connected to the pressure chamber (4-5).

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