CN212352759U - Sprue needle valve device of multi-sprue hot runner injection mold - Google Patents
Sprue needle valve device of multi-sprue hot runner injection mold Download PDFInfo
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- CN212352759U CN212352759U CN202021526923.8U CN202021526923U CN212352759U CN 212352759 U CN212352759 U CN 212352759U CN 202021526923 U CN202021526923 U CN 202021526923U CN 212352759 U CN212352759 U CN 212352759U
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Abstract
The utility model discloses a many runners injection mold's runner needle valve device fills the die cavity through the runner, and when the molten resin who fills the die cavity reachd follow-up runner position, the needle of the corresponding follow-up runner position of direct action makes the needle come back to the response position because the pressure of molten resin, and response contactor sends the sensing signal, and the response signal control piston according to response contactor in the die cavity drives the needle motion with the switching runner.
Description
Technical Field
The utility model is used for controlling the needle valve gear of many runners injection mold's runner, especially for filling the die cavity of the mould of many runners, according to the inside molten resin flow direction, the needle valve gear of a plurality of runners of timely switching especially relates to a runner needle valve gear of many runners injection mold.
Background
In order to properly distribute a molten resin in a cavity of a hot runner injection mold, a plurality of gates are provided in one cavity in consideration of the fluidity of the molten resin filled in the cavity. The multi-gate hot runner injection mold uses compressed air to drive a piston device which moves forward/backward, a valve needle which moves forward/backward, and a gate which is opened and closed. A piston-operated gate needle valve device (referenced in patent literature 1KR 10-0448373B) was used.
In a conventional multi-gate hot runner injection mold needle valve operation mode, a gate is opened and closed in a sequence control mode of sequentially opening and closing a gate needle valve according to a sequence control signal set in advance by a controller.
That is, as shown in patent document 1, according to the gate needle valve sequence control method, after the gate (the 1 st gate) is opened in advance, the controller opens the gate (the 2 nd gate) of the molten resin flow path closest to the 1 st gate after a predetermined time (delay time) set in advance. And (4) sequentially controlling, wherein the timing of opening the gate (gate 2) subsequently is determined by computer simulation in advance by considering the flow speed of the resin in the cavity and equally distributing and filling the resin in the cavity.
However, in the gate needle valve opening and closing control based on such computer simulation, there is a problem that injection molding defects such as weld marks (weldlines) occur when molten resins are filled through gates and merged in a cavity due to a difference in actual flow direction of the molten resins in the cavity.
In order to solve such problems, the actual internal temperature and pressure of the cavity are detected, it is judged that the molten resin reaches a specific position, and the opening and closing gate comes from patent literature 2KR10-1285371B according to the detection result.
However, as shown in patent document 2KR10-1285371B, a gate opening/closing control system using a pressure sensor and a temperature sensor is expensive, cannot be installed at each desired position, and the minimum number of sensors are installed at the positions where the sensors are most needed. If the sensor and the position are not correct and the number is insufficient, the gate opening timing and the actual molten resin drive are not matched, resulting in a problem of poor molding such as 'weld mark' in injection molding. And the sensor is arranged on the die, so that the defect of limitation on the arrangement of the sensor is overcome.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a many runners hot runner injection mold's runner needle valve device, the utility model relates to a solve the problem point of technique in the past, many runners hot runner injection mold flows into the inside molten resin of die cavity in advance through the runner when follow-up actual arrival runner position, opens the runner, provides control runner needle valve device for the purpose.
In addition, the present invention provides a multi-gate hot runner injection mold having at least one gate in one cavity, wherein the molten resin in the cavity is filled through the gate in advance, the gate is opened at a correct time point when the gate position is subsequently and actually reached in the cavity, and the molten resin filled through the gate and the molten resin filled in advance are merged in the follow-up process, thereby providing a method for controlling a gate needle valve device.
For solving the technical problem, the utility model discloses a technical scheme be:
the utility model provides a many runners hot runner injection mold's runner needle valve device which characterized in that includes: the device comprises a cavity (2) positioned between a fixed die (1A) and a movable die (1B), a pouring gate (3), a valve needle guide sleeve (12a), a nozzle (10) arranged in the fixed die, a valve needle (20), an induction contactor (70) used for inducing whether molten resin reaches the position (G) of the pouring gate (3), and a controller used for sending a pouring gate opening and closing signal according to an arrival signal of the induction contactor (70);
the cavity (2) is communicated with a plurality of gates (3), each gate (3) is correspondingly provided with a nozzle (10), a valve needle guide sleeve (12a) is arranged in the nozzle (10) in a penetrating way in the length direction and communicated with the gate (3), a flow channel (5) is arranged in the flow distribution plate (4), a resin channel (13) is arranged in the nozzle (10), the resin channel (13) is respectively communicated with the flow channel (5) and the valve needle guide sleeve (12a), and the flow channel (5) and the resin channel (13) convey molten resin to each gate (3);
the valve needle (20) is movably arranged in the valve needle guide sleeve (12a), when the valve needle (20) is located at the maximum advancing position, the tip (21) at the lower end of the valve needle (20) completely closes the pouring gate (3), and when the valve needle (20) is located at the maximum retreating position, the tip (21) at the lower end of the valve needle (20) completely opens the pouring gate (3);
the piston (40) is positioned in the piston appliance (30), and the piston (40) drives the valve needle (20) to move back and forth between a maximum advancing position and a maximum retreating position according to a pouring gate opening and closing signal of the controller;
an induction part (26) is provided on the upper part of the valve needle (20), so that the induction contactor (70) acquires positional relation information of the molten resin (M) reaching the gate (3) according to the position of the induction part (26).
In a preferred embodiment of the present invention, the valve needle (20) comprises a valve needle body (24), a tip (21), a head (22) disposed at the upper end of the valve needle body (24), and a connecting portion (25) connected to the head (22), wherein an extension rod (27) is disposed at the upper end of the connecting portion (25), and an induction portion (26) for cooperating with an induction operation of the induction contactor (70) is connected to the upper end of the extension rod (27).
In a preferred embodiment of the present invention, the cylinder (31) drives the piston (40) to move forward or backward in the inner space to drive the valve needle (20) to move to the maximum forward position or the maximum backward position, a connecting portion seat groove (42) for connecting the connecting portion (25) is provided in the central shaft (41), so that the piston (40) is kept stationary when the valve needle (20) moves between the maximum forward position and the sensing position (P1) of the sensing contactor (70), and a corresponding gap (H) is formed between the inner rear wall surface (42a) of the connecting portion seat groove (42) and the hanging table (25a) of the connecting portion (25) according to a distance between the sensing position (P1) and the maximum forward position.
In a preferred embodiment of the present invention, a cylinder partition wall (32) is provided in the cylinder (31), the cylinder partition wall (32) divides the internal space of the cylinder (31) into an upper piston chamber (33U) and a lower piston chamber (33L), the piston (40) is movably provided in the upper piston chamber (33U), a piston assist (50) is provided in the lower piston chamber (33L), and compressed air flowing into the lower space passes through the piston assist (50) to drive the piston (40) to retreat, so that the gap (H) is formed in the connecting portion seat groove (42).
In a preferred embodiment of the present invention, the resin passage (13) is a spiral groove spirally formed outside the nozzle (10), the upper end of the spiral groove communicates with the flow passage (5), and the connection path (15) communicates with the needle guide sleeve (12a) and the upper end of the spiral groove, respectively.
In a preferred embodiment of the present invention, the resin passage (13) and the needle guide sleeve (12a) are two separate passages provided in the nozzle body (12), and the resin passage (13) is respectively communicated with the connecting path (15) and the flow passage (5).
In a preferred embodiment of the present invention, the sensing contactor (70) senses the positional relationship between the sensing position (P1) and the retracted extension rod (27), and sends a return switch and a proximity switch for signaling the arrival of the gate.
The utility model has the advantages that: the molten resin is first filled into the cavity through the gate, the gate is opened at a correct time point when the molten resin subsequently filled through the gate actually reaches the gate position in the cavity, the molten resin subsequently filled through the gate and the molten resin previously filled are merged, the molten resins are sequentially filled through the multiple gates and merged at different time points, and injection molding without injection molding defects such as weld marks is performed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
FIG. 1 is a schematic sectional view of a preferred embodiment of a gate needle valve device of a multi-gate hot runner injection mold according to the present invention;
FIG. 2 is an enlarged view of the 'X' portion of the gate needle valve assembly of the multi-gate hot runner injection mold of FIG. 1;
FIG. 3 is a schematic structural diagram of a valve needle of a gate needle valve device of a multi-gate hot runner injection mold according to the present invention;
FIG. 4 is an enlarged schematic view of a piston device in a gate needle valve device of a multi-gate hot runner injection mold according to the present invention;
FIG. 5 is a schematic structural view of a preferred embodiment of a nozzle of a gate needle valve device of a multi-gate hot runner injection mold according to the present invention;
FIG. 6 is a schematic structural view of another preferred embodiment of a nozzle of a gate needle valve device of a multi-gate hot runner injection mold according to the present invention;
FIG. 7 is a schematic structural diagram of a gate needle valve device of a multi-gate hot runner injection mold according to the present invention at the preparation stage of the induction operation;
FIG. 8 is a schematic structural diagram of a gate needle valve device triggering induction stage of the multi-gate hot runner injection mold of the present invention;
FIG. 9 is a schematic diagram of a structure of a gate needle valve device of a multi-gate hot runner injection mold according to the present invention at a molten resin confluence stage;
fig. 10 is a schematic view showing a structure in a state where the cavity is filled with the molten resin and the gate is closed with the valve pin.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-10, an embodiment of the present invention includes:
fig. 1 shows the utility model discloses in be provided with most runner hot runner injection mold of runner needle valve device. In fig. 1, the reference symbols '1A' and '1B' refer to a stationary mold block and a movable mold block of each mold, '2' refers to a cavity, '3' refers to a gate, '4' refers to a manifold, '5' refers to a runner of the manifold, '6' refers to an upper panel, and '7' refers to a cylinder head.
The utility model relates to a many runners hot runner injection mold's runner needle valve device, including die cavity (2), runner (3), needle guide pin bushing (12a) that are located between cover half (1A) and movable mould (1B), set up nozzle (10), needle (20) in the cover half, be used for responding to whether molten resin reachs induction contactor (70) of runner (3) position (G), send the controller of runner switching signal according to the arrival signal of induction contactor (70).
The cavity (2) is communicated with a plurality of pouring gates (3), each pouring gate (3) is correspondingly provided with a nozzle (10), the valve needle guide sleeve (12a) is arranged in the nozzle (10) in a penetrating mode in the length direction and communicated with the pouring gate (3), the flow distribution plate (4) is internally provided with a flow channel (5), the resin channel (13) is arranged in the nozzle (10), the resin channel (13) is respectively communicated with the flow channel (5) and the valve needle guide sleeve (12a), and the flow channel (5) and the resin channel (13) convey molten resin to each pouring gate (3).
A gate needle valve device (100) for opening and closing each gate (3) is provided in the injection mold fixed block (1A).
The valve needle (20) is movably arranged in the valve needle guide sleeve (12a), when the valve needle (20) is located at the maximum advancing position, the sharp head (21) at the lower end of the valve needle (20) completely seals the pouring gate (3), and when the valve needle (20) is located at the maximum retreating position, the sharp head (21) at the lower end of the valve needle (20) completely opens the pouring gate (3).
The piston (40) is positioned in the piston appliance (30), and the piston (40) drives the valve needle (20) to move back and forth between a maximum advancing position and a maximum retreating position according to a pouring gate opening and closing signal of the controller.
The controller signals a gate open for the valve pin to open the gate or a gate closed for the valve pin to close the gate.
An induction part (26) is provided on the upper part of the valve needle (20), so that the induction contactor (70) acquires the position information of the molten resin (M) and the gate (3) according to the position of the induction part (26).
When the molten resin (M) inside the cavity (2) reaches the gate position (G), the pressure of the molten resin (M) drives the valve pin (20) to move to the sensing position (P1) and the tip (21) keeps closing the gate (3), so that the sensing contactor (70) detects the sensing part (26) and signals that the molten resin (M) reaches the gate position (G).
The controller receives a signal that the molten resin (M) sent by the induction contactor (70) reaches the gate position (G) and sends a gate opening signal, and the piston appliance (30) and the piston (40) drive the valve needle (20) to retreat to the maximum retreating position according to the gate opening signal so as to open the gate (3).
As shown in fig. 2, the gate needle valve device (100) (100A) of the present invention includes a nozzle (10), a valve needle (20) for opening and closing a gate (3), and a drive unit, wherein the valve needle (20) is retracted or advanced to open and close the piston (30) of the gate (3), and a sensing contactor (70) for sensing that a molten resin reaches the gate position are filled in the cavity (2), and the sensing contactor (70) is triggered when the molten resin is filled to the position where the gate (3) is formed (hereinafter referred to as a 'gate position' (G)).
As shown in fig. 5, the nozzle (10) includes a main body (11), a through hole (11a) provided in the main body (11) in the longitudinal direction, and a nozzle main body (12) having a needle guide (12a) penetrating in the longitudinal direction, the nozzle main body (12) is fixed in the through hole (11a) of the main body (11), and a nozzle tip (14) is communicated with the lower end of the through hole (11 a).
The periphery of the nozzle body (12) is provided with a resin channel (13). The resin channel (13) is communicated with the runners (5) on the flow distribution plate (4) and the gates (3), and guides the molten resin in the runners (5) to be conveyed to the gates (3).
In this embodiment, the resin passage (13) may be a spiral groove provided on the outer periphery of the nozzle body (12). The outlet of the resin passage (13) communicates with a connection path (15) provided inside the nozzle tip (14). The connecting path (15) and a resin channel (13) formed in the nozzle body (12) are communicated with the gate (3), and molten resin is directly introduced to the gate (3) through the runner (5) and the connecting path (15) without being conveyed through the valve pin guide sleeve (12 a).
The connecting path (15) is located in a nozzle tip (14) of the nozzle (10), and the amount of molten resin dripping to the connecting path (15) is small, so that the pressure is not so large as to interfere with the operation of sensing the retreating direction of the needle (20) (which will be described in detail later), that is, the resin passage (13) is formed on the outer periphery of the nozzle body (12), and the sensing of the needle (20) is not affected by the pressure of the molten resin supplied to the gate (3).
Unlike the embodiment of fig. 5, the resin passage (13) and the needle guide (12a) are two separate passages provided in the nozzle body (12), and the resin passage (13) communicates with the connecting path (15) and the flow passage (5), respectively.
As shown in fig. 6, the resin channel (13) and the valve needle guide sleeve (12a) form different channels for the purposes of: in the prior art, a valve needle guide sleeve (12a) and a resin channel are used together, and the pressure of molten resin filling the interior of the valve needle guide sleeve (12a) acts as an obstacle to the opening of a valve needle gate (advancing direction). The pressure of the molten resin reaching the gate position inside the cavity (2) is a sensing operation of the valve pin (20), and the problem of hindering the backward movement is eliminated.
The valve needle (20) is arranged in the valve needle guide sleeve (12a) of the nozzle body (12) in a sliding mode.
As shown in fig. 3, the valve needle (20) includes a valve needle body (24), a tip (21) for opening and closing the gate (3) is disposed at a front end of the valve needle body (24), a head (22) is disposed at a rear end of the valve needle body (24), a connecting portion (25) connected to the head (22) is disposed at a front end of an extension rod (27), and a sensing portion (26) is disposed at a rear end of the extension rod (27).
The valve needle body (24) passes through a central through hole (16a) on the nozzle inner side body (16) in the flow distribution plate (4) and is inserted into a valve needle guide sleeve (12a) in the nozzle body (12). The nozzle inner body (16) is provided with a resin path (17) communicating with the runner (5) and the resin passage (13) so that the molten resin supplied from the runner (5) of the flow distribution plate (4) can be guided to the resin passage (13) of the nozzle body (12) through the resin path (17).
The head part (22) of the valve needle body (24) is connected with a piston tool (30) arranged on the upper panel (6), and an extension rod (27) for extending the valve needle (20) is connected with the head part (22) in a coaxial direction.
As shown in fig. 2 and 4, a cylinder (31) connected to the die top plate (6) is provided in the piston tool (30), a cylinder partition wall (32) extending radially inward from the inner side wall is provided in the cylinder (31), the cylinder partition wall (32) divides the internal space of the cylinder (31) into an upper piston chamber (33U) and a lower piston chamber (33L), and a central through hole (32a) in the central axis direction is formed in the center of the cylinder partition wall (32).
The upper piston chamber (33U) is provided with a piston (40), and the lower piston chamber (33L) is provided with a piston assist (50).
When the cylinder operates to move forwards or backwards in an upper piston chamber (33U), the piston (40) drives the valve needle (20) to move to a maximum forward position or a maximum backward position, a connecting part seat groove (42) is formed in a central shaft (41), and the connecting part seat groove (42) is connected with the connecting part (25) of the valve needle (20).
According to the induction moving distance (the distance that the valve pin moves to the induction position along with the pressure of the molten resin reaching the gate position), a certain gap (H) is correspondingly formed between the inner rear wall surface (42a) of the connecting part seat groove (42) and the hanging platform (25a) of the connecting part (25).
As shown in fig. 4, compressed air flows into a lower space (50L) of the piston assist (50), and according to the compressed air, the piston (40) is retracted as the piston assist (50) is retracted, and the needle forms a gap (H) between the inner rear wall surface (42a) and the hanging platform (25a) inside the connecting portion seat groove (42) by its own weight. As the gap (H) is formed between the piston (40) and the needle (20) inside the coupling seat groove (42), the piston (40) does not move and only the needle (20) moves to the sensing position (P1) when the sensing contactor (70) senses operation.
The piston (40) moves to the maximum advancing position, the valve needle (20) moves to the maximum advancing position, the sharp head (12) arranged at the front end of the valve needle (20) completely closes the pouring gate (3), the piston (40) retreats, the valve needle (20) moves to the maximum retreating position, the sharp head (12) completely opens the pouring gate (3), and the molten resin is filled into the cavity (2) through the pouring gate (3).
As described above, the valve pin (20) is retracted to the maximum retraction position by retraction operation of the piston (40), the molten resin passes through the first gate before the gates (3) are completely opened, and when the molten resin filled in the cavity first reaches the subsequent gate position, the sensing device corresponding to the gate position is activated.
When the gate (3) is completely closed, the tip (21) of the valve pin (20) fills the molten resin in the cavity (2) 'a gate position in the cavity' (hereinafter referred to as 'gate position' (G)) and the molten resin applies pressure to the bottom surface of the tip (21) in the cavity (2) and the valve pin (20) moves to the 'sensing position' (P1) to indicate that the molten resin reaches the 'gate position' (G).
The pressure of the molten resin pushes the valve pin (20) to move to a sensing position (P1), and the gap (H) formed between the inner rear wall surface (42a) and the hanging table (25a) can make the valve pin (20) retreat, so that the piston (40) does not retreat, the sharp head (21) of the valve pin (20) retreats to the state before the gate (3) closes and opens, and simultaneously, the sensing part (26) on the extension rod (27) moves to a sensing position (P1).
The sensing part (26) of the extension rod (27) retreats to a sensing position (P1), and a sensing contactor (70) arranged on the cylinder cover (7) senses the sensing part (26) and sends a signal that the molten resin in the cavity (2) reaches the gate to a controller (not shown).
The induction contactor (70) may employ a return sensor that sends a molten resin gate arrival signal by contacting the induction portion (26). The inductive contactor (70) may employ a 'proximity sensor' that emits an inductive signal by approaching and non-contacting the inductive portion (26).
The controller receives a 'molten resin gate arrival signal' sent by the induction contactor (70), the solenoid valve receives an opening signal sent by the controller to open the air passage A, and compressed air flows into the lower side space of the piston (40) through the air passage A; the piston (40) retreats, and the valve needle (20) positioned at the sensing position (P1) also continuously retreats to the maximum retreating position to completely open the gate (3); then, the molten resin in the connecting path (15) is filled into the cavity (2) through the gate (3), and is joined to the molten resin that has been filled and flowed in the cavity.
Hereinafter, the operation control method of the gate needle valve of the multi-gate hot runner injection mold according to the present invention will be described.
As shown in fig. 7, the piston means (30) drives the piston (40) forward to completely close the gate (3) with the valve pin (20), and the valve pin (20) is ready for sensing: compressed air is filled into the lower side space of the piston assist (50) through the air passage E, so that the piston assist (50) drives the piston (40) to retreat, and the piston (40) retreats to form a certain gap (H) between the hanging table (25a) and the inner part of the valve needle seat groove (42).
Thereafter, the molten resin (M) filled in the cavity (2) moves to reach the gate position (G), the molten resin (M) applies an upward pressure (arrow direction) to the tip (21), the tip (21) and the sensing portion (26) are simultaneously retracted, and the sensing portion is retracted to the sensing position (P1).
When the induction contactor (70) detects the induction part (26) moved to the induction position (P1), the induction contactor (70) sends a signal to the controller that the molten resin in the cavity (2) reaches the gate position (G).
As shown in fig. 9, the controller receives a 'molten resin reaches gate position signal' from the induction contactor (70), sends an opening signal to the solenoid valve needle valve that controls the opening and closing of the air passage a, fills compressed air into the lower piston chamber (33L) below the piston (40) through the air passage a, retreats the piston (40), and drives the valve needle (20) to move to the maximum retreating position to open the gate (3), and the resin passage (13) fills the molten resin into the cavity (2) through the connecting path (15) and the gate (3).
In this state, the molten resin filled into the cavity (2) through the gate (3) flows into the cavity (2) and merges with the molten resin (M) previously filled into the cavity (2).
As shown in fig. 10, after the molten resin (M) in the cavity (2) is filled, the controller sends an opening signal to the solenoid valve that controls the opening and closing of the air passage B, so that the solenoid valve opens the air passage B, and delivers compressed air into the upper piston chamber (33U) to push the piston (40) to advance, and the piston (40) drives the valve needle (20) to move to the maximum advance position to close the gate (3).
Detailed description of the preferred embodiment
The utility model provides a many runners hot runner injection mold's runner needle valve device possesses a die cavity (2), possesses on a die cavity (2) and has 2 runners (3), does according to open order in proper order: the gate opened first is the '1 st gate' (3A), and the gate opened subsequently is the '2 nd gate' (3B).
The gate needle valve device for opening and closing the 1 st gate (3A) is called a 1 st gate needle valve device (100A), and the gate needle valve device for opening and closing the 2 nd gate (3B) is called a 2 nd gate needle valve device (100B).
The 1 st gate needle valve device (100A) and the 2 nd gate needle valve device (100B) may be the same configuration. The same name and symbol can be used for constituent auxiliary materials with the same skill in 2 gate needle valve devices (100A,100B), when the 1 st gate needle valve device (100A) constituent auxiliary material is distinguished from the 2 nd gate needle valve device (100B), the 1 st gate needle valve device (100A) constituent auxiliary material symbol tail is added with a character 'A', and the 2 nd gate needle valve device (100B) constituent auxiliary material symbol tail is added with a character 'B'.
The use steps of the sprue needle valve device of the multi-sprue hot runner injection mold comprise:
1. advancing the 1 st piston in the 1 st piston device and the 2 nd piston in the 2 nd piston device to enable the 1 st valve pin and the 2 nd valve pin to advance to the maximum advancing position and close the 1 st pouring gate and the 2 nd pouring gate;
2. supplying compressed air to a lower piston chamber of a 1 st piston appliance, enabling a 1 st piston in the 1 st piston appliance to retreat and driving a 1 st valve needle to retreat to a maximum retreating position, completely opening a 1 st pouring gate, and filling molten resin into a cavity by a resin channel;
3. before the molten resin filled into the cavity from the 1 st gate reaches the 2 nd gate position, filling compressed air into the 2 nd piston auxiliary lower space in the 2 nd piston appliance to make the 2 nd valve needle prepare for induction operation;
4. when the molten resin in the cavity reaches the 2 nd gate position, the molten resin presses the 2 nd valve pin in the 2 nd piston appliance, so that the valve pin is retracted to the sensing position;
5. the induction contactor induces the induction part retreating to the induction position and sends a signal that the molten resin reaches the 2 nd pouring gate to the controller;
6. the controller receives a signal that the molten resin reaches the 2 nd gate, and controls the electromagnetic valve to fill compressed air into the lower piston chamber of the 2 nd piston, the 2 nd piston retreats, and drives the 2 nd valve needle to move to the maximum retreating position, and the 2 nd gate is opened;
7. the molten resin is filled into the cavity through the 2 nd gate, and the molten resin filled through the 2 nd gate and the molten resin filled through the 1 st gate are merged;
8. after the molten resin is filled in the cavity, the 1 st piston drives the 1 st valve needle to advance to close the 1 st gate, and then the 2 nd piston drives the 2 nd valve needle to advance to close the 2 nd gate, so that the injection molding is completed.
The utility model relates to a many runners hot runner injection mold's runner needle valve device's beneficial effect is: the molten resin is first filled into the cavity through the gate, the gate is opened at a correct time point when the molten resin subsequently filled through the gate actually reaches the gate position in the cavity, the molten resin subsequently filled through the gate and the molten resin previously filled are merged, the molten resins are sequentially filled through the multiple gates and merged at different time points, and injection molding without injection molding defects such as weld marks is performed.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.
Claims (7)
1. The utility model provides a runner needle valve device of many runners injection mold which characterized in that includes: the device comprises a cavity (2) positioned between a fixed die (1A) and a movable die (1B), a pouring gate (3), a valve needle guide sleeve (12a), a nozzle (10) arranged in the fixed die, a valve needle (20), an induction contactor (70) used for inducing whether molten resin reaches the position (G) of the pouring gate (3), and a controller used for sending a pouring gate opening and closing signal according to an arrival signal of the induction contactor (70);
the cavity (2) is communicated with a plurality of gates (3), each gate (3) is correspondingly provided with a nozzle (10), a valve needle guide sleeve (12a) is arranged in the nozzle (10) in a penetrating way in the length direction and communicated with the gate (3), a flow channel (5) is arranged in the flow distribution plate (4), a resin channel (13) is arranged in the nozzle (10), the resin channel (13) is respectively communicated with the flow channel (5) and the valve needle guide sleeve (12a), and the flow channel (5) and the resin channel (13) convey molten resin to each gate (3);
the valve needle (20) is movably arranged in the valve needle guide sleeve (12a), when the valve needle (20) is located at the maximum advancing position, the tip (21) at the lower end of the valve needle (20) completely closes the pouring gate (3), and when the valve needle (20) is located at the maximum retreating position, the tip (21) at the lower end of the valve needle (20) completely opens the pouring gate (3);
the piston (40) is positioned in the piston appliance (30), and the piston (40) drives the valve needle (20) to move back and forth between a maximum advancing position and a maximum retreating position according to a pouring gate opening and closing signal of the controller;
an induction part (26) is provided on the upper part of the valve needle (20), so that the induction contactor (70) acquires positional relation information of the molten resin (M) reaching the gate (3) according to the position of the induction part (26).
2. The gate needle valve device of the multi-gate hot runner injection mold according to claim 1, wherein the valve needle (20) comprises a valve needle body (24), a tip (21), a head part (22) arranged at the upper end of the valve needle body (24), and a connecting part (25) connected with the head part (22), an extension rod (27) is arranged at the upper end of the connecting part (25), and a sensing part (26) for cooperating with the sensing operation of the sensing contactor (70) is connected to the upper end of the extension rod (27).
3. The gate needle valve device of a multi-gate hot runner injection mold according to claim 2, wherein the cylinder (31) drives the piston (40) to move forward or backward in the inner space to drive the valve pin (20) to move to the maximum forward position or the maximum backward position, a connecting portion seat groove (42) for connecting the connecting portion (25) is provided in the central shaft (41), so that the piston (40) is kept stationary while the valve pin (20) moves between the maximum forward position and the sensing position (P1) of the sensing contactor (70), and a corresponding gap (H) is formed between the inner rear wall surface (42a) of the connecting portion seat groove (42) and the hanging table (25a) of the connecting portion (25) according to a distance between the sensing position (P1) and the maximum forward position.
4. The gate needle valve device of the multi-gate hot runner injection mold according to claim 3, wherein a cylinder partition wall (32) is disposed in the cylinder (31), the cylinder partition wall (32) divides an internal space of the cylinder (31) into an upper piston chamber (33U) and a lower piston chamber (33L), the piston (40) is movably disposed in the upper piston chamber (33U), a piston assist (50) is disposed in the lower piston chamber (33L), and compressed air flowing into the lower space drives the piston (40) to retreat through the piston assist (50), so that the gap (H) is formed in the connecting portion seat groove (42).
5. The gate needle valve device of the multi-gate hot runner injection mold of claim 1, wherein the resin channel (13) is a spiral groove spirally formed on the outer side of the nozzle (10), the upper end of the spiral groove communicates with the runner (5), and the connecting path (15) communicates with the valve needle guide sleeve (12a) and the upper end of the spiral groove, respectively.
6. The gate needle valve device of a multi-gate hot runner injection mold according to claim 1, wherein the resin passage (13) and the valve needle guide (12a) are two separate passages provided in the nozzle body (12), and the resin passage (13) communicates with the connecting path (15) and the runner (5), respectively.
7. The gate needle valve assembly of a multi-gate hot runner injection mold of claim 1, wherein said sensing contact (70) senses the positional relationship of said sensing position (P1) to the retracted extension rod (27), and a return switch and a proximity switch that signal gate arrival.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021526923.8U CN212352759U (en) | 2020-07-29 | 2020-07-29 | Sprue needle valve device of multi-sprue hot runner injection mold |
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|---|---|---|---|
| CN202021526923.8U CN212352759U (en) | 2020-07-29 | 2020-07-29 | Sprue needle valve device of multi-sprue hot runner injection mold |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112895336A (en) * | 2021-04-01 | 2021-06-04 | 江苏博盟科技有限公司 | Flash-free liquid silica gel mold |
| CN116039012A (en) * | 2023-01-09 | 2023-05-02 | 浙江恒道科技有限公司 | Multi-piston cylinder and control mode |
-
2020
- 2020-07-29 CN CN202021526923.8U patent/CN212352759U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112895336A (en) * | 2021-04-01 | 2021-06-04 | 江苏博盟科技有限公司 | Flash-free liquid silica gel mold |
| CN116039012A (en) * | 2023-01-09 | 2023-05-02 | 浙江恒道科技有限公司 | Multi-piston cylinder and control mode |
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