Flow adjusting method and adjusting valve for molten material injection during injection molding

Abstract

The invention provides a flow adjusting method and an adjusting valve for molten material injection during injection molding, and belongs to the technical field of injection molding control. The molten material flows into the pouring gate through the injector with the first channel, the flow of the pouring gate is adjusted through the valve, at least one flow adjusting hole is formed in the valve, any flow adjusting hole is aligned to or overlapped with the pouring gate by moving the valve, and the flow is adjusted according to the alignment or overlapping degree. Molten materials hardly have the risk of irregular flowing in actual orifices, the flowing path of the molten materials cannot be changed, accumulation and flowing stagnation cannot occur, and it is ensured that disturbance to flowing of the molten materials cannot be increased; the symmetrical actual orifices ensure uniform flow of the material in all directions, so that non-uniform flow velocity or material deformation caused by irregular flow is avoided, and the flow of the molten material is more stable and controllable; the injection flow of the molten material is accurately and quickly adjusted, and the operation is simple.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding control, and relates to a flow rate regulating method and a regulating valve for injecting molten material during injection molding. Background Art

[0002] In order to ensure product quality and production efficiency during injection molding, the flow of molten material needs to be precisely controlled. In the prior art, the flow of molten material from the nozzle to the mold cavity is mostly controlled by a valve needle. When the valve needle moves forward, it can flow through the channel to prevent the molten material from continuing to flow. When the valve needle moves backward, it can open the flow channel to allow the molten material to flow into the mold cavity. However, when the valve needle moves back and forth, the flow path and speed of the molten material will change, resulting in material accumulation in certain areas, while the material in other areas may stagnate. This accumulation and stagnation phenomenon will increase the disturbance of the molten material flow, and the accumulation and stagnation areas are difficult to clean, so that the color change operation of the injection material requires multiple cleaning injections, thereby wasting a lot of material. Summary of the invention

[0003] The object of the present invention is to provide a flow rate regulating method for injecting molten material during injection molding in view of the above problems.

[0004] Another object of the present invention is to provide a flow regulating valve for injecting molten material during injection molding.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A flow rate regulating method for injecting molten material during injection molding, wherein the molten material flows into a gate through a syringe having a first channel, and the flow rate of the gate is regulated by a valve, wherein at least one flow rate regulating hole is provided on the valve, and any flow rate regulating hole is aligned or overlapped with the gate by moving the valve, and the flow rate is regulated according to the degree of alignment or overlap.

[0006] The degree of alignment or overlap between the flow regulating hole and the gate determines the actual orifice through which the molten material flows into the gate. By adjusting the flow rate according to the degree of alignment or overlap, the flow rate of the molten material can be precisely controlled, thereby optimizing the material utilization efficiency and the final quality of the product. During the movement of the valve, the actual orifice formed between the flow regulating hole and the gate is always symmetrical in shape, and the molten material has almost no risk of irregular flow in the actual orifice. The flow path of the molten material will not be changed, so that it will not accumulate and flow stagnation, ensuring that there will be no increase in disturbance to the flow of the molten material. The symmetrical actual orifice ensures uniform flow of the material in all directions, avoids uneven flow rate or material deformation caused by irregular flow, and makes the flow of the molten material smoother and more controllable, which helps to reduce fluctuations and uncertainties in the production process and improves production stability and repeatability.

[0007] In the above-mentioned flow regulating method for injecting molten material during injection molding, the flow regulating hole is rotated by the valve rotation axis so as to approach or move away from the gate, thereby achieving alignment or overlap of the flow regulating hole and the gate.

[0008] The process of aligning the flow regulating hole with the gate is gradual and continuous. The actual orifice formed between the flow regulating hole and the gate determines the instantaneous flow rate of the molten material, and the degree of alignment or overlap between the flow regulating hole and the gate is proportional to the rotation of the quasi-flow regulating hole, which facilitates the adjustment of the flow rate and makes the metering of the molten material inflow more accurate.

[0009] In the above-mentioned flow rate regulating method for molten material injection during injection molding, the rotation axis of the valve is parallel to the gate axis of the gate.

[0010] In the above-mentioned flow rate regulation method for molten material injection during injection molding, the valve is provided with a rotation axis; Alternatively, the valve rotation axis is located outside the valve.

[0011] In the above-mentioned flow rate regulating method for injecting molten material during injection molding, there are multiple flow rate regulating holes distributed circumferentially along the rotation axis.

[0012] During the valve rotation process, any flow regulating hole can be aligned or overlapped with the gate to adjust the flow of the molten material.

[0013] In the above-mentioned flow rate regulating method for injecting molten material during injection molding, the plurality of flow rate regulating holes are isolated from each other and at least two of the flow rate regulating holes have different apertures.

[0014] The flow regulating holes are isolated from each other and at least two of the flow regulating holes have different apertures, so that the injection flow rate of the molten material can be changed by aligning or overlapping the flow regulating holes and the gate with different apertures without changing the size of the syringe, which significantly simplifies the operating cost and tool cost, and can change the flow rate of the molten material while maintaining the actual orifice symmetry.

[0015] In the above-mentioned flow rate regulating method for injecting molten material during injection molding, a plurality of flow rate regulating holes are distributed in an array along the circumference of the rotation axis.

[0016] During the injection cycle, the rapid rotation of the valve can make multiple flow regulating holes completely aligned or overlapped at the gate more than once to dynamically adjust the flow of the molten material.

[0017] A flow regulating valve for injecting molten material during injection molding comprises a gate insert and a gate arranged on the gate insert, the gate insert is provided with a gate movable narrow cavity connected to the gate, a flat gate is provided in the gate movable narrow cavity, a plurality of flow regulating holes penetrating through both ends of the gate are provided on the gate, and the number of the flow regulating holes is ≥1, the flow regulating holes are used to connect the upper and lower ends of the gate and the aperture of the flow regulating holes is not larger than the aperture of the gate, the gate is connected to a gate moving mechanism, and the position of the flow regulating hole is changed by moving the gate, thereby changing the connection state of the gate.

[0018] The gate moving mechanism can drive the gate to move to change the position of the flow regulating hole and thus change the connection state of the gate. The connection state is that the flow regulating hole is aligned or overlapped with the gate, and the flow is adjusted according to the degree of alignment or overlap.

[0019] In the above-mentioned regulating valve, the gate moving mechanism includes a rotating shaft arranged on or outside the gate, the gate is connected to the power transmission component, and the gate is provided with a plurality of flow regulating holes distributed circumferentially along the rotation center of the rotating shaft.

[0020] The power transmission component can drive the gate to rotate with the rotating shaft as the rotating axis, so that any flow regulating hole is aligned with or overlapped with the gate, and the flow is adjusted according to the degree of alignment or overlap.

[0021] In the above-mentioned regulating valve, the gate moving mechanism includes a connecting rod and the rotating shaft arranged on the connecting rod, one end of the connecting rod is connected to the gate, a sliding groove deviating from the rotation center of the rotating shaft is also provided on the connecting rod, a sliding rod is provided in the sliding groove, and the sliding rod is connected to the driving rod; Alternatively, the gate moving mechanism comprises an L-shaped connecting rod, one end of which is connected to the gate, and the other end of which is provided with the rotating shaft; Alternatively, the gate moving mechanism includes a rack and a gear body, the gear body is arranged on the side of the gate, and the rotating shaft is arranged on the gate.

[0022] The driving rod can reciprocate along the axial direction of the driving rod through the driver to drive the connecting rod to rotate clockwise or counterclockwise around the rotating shaft, thereby aligning or overlapping any flow regulating hole with the gate, and adjusting the flow according to the degree of alignment or overlap; Alternatively, the driver can drive the rotating shaft to rotate to drive the L-shaped connecting rod to swing, thereby aligning or overlapping any flow regulating hole with the gate, and adjusting the flow according to the degree of alignment or overlap; Alternatively, the driver can drive the rack to move back and forth along the axial direction of the rack to drive the tooth body to rotate counterclockwise or clockwise around the rotating shaft, thereby aligning or overlapping any flow regulating hole with the gate, and adjusting the flow according to the degree of alignment or overlap.

[0023] Compared with the existing technology, the advantages of the present invention are: 1. The actual orifice formed between the flow regulating hole and the gate is always symmetrical in shape, and the molten material has almost no risk of irregular flow in the actual orifice. The flow path of the molten material will not be changed, so that it will not accumulate and flow stagnation, ensuring that there will be no increase in the disturbance of the molten material flow. 2. The symmetrical actual orifice ensures uniform flow of the material in all directions, avoids uneven flow rate or material deformation caused by irregular flow, and makes the flow of the molten material smoother and more controllable, which helps to reduce fluctuations and uncertainties in the production process and improves production stability and repeatability. 3. The injection flow rate of the molten material can be adjusted accurately and quickly, and the operation is simple, which significantly simplifies the operating cost and tool cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure provided by the present invention; Figure 2 yes Figure 1 A magnified schematic diagram of the middle; Figure 3 This is a schematic diagram of the structure when the flow regulating hole and the gate completely overlap; Figure 4 It is a schematic diagram of the structure when the gate is closed; Figure 5 It is a structural diagram of the gate moving mechanism; Figure 6 is a cross-sectional view of the overall structure provided in Example 2; Figure 7 is a schematic structural diagram of the gate moving mechanism in the second embodiment; Figure 8 is a cross-sectional view of the overall structure provided in Example 3; Fig. 9is a schematic diagram of the structure of the gate moving mechanism in the third embodiment; Figure 10-13 This is a position distribution diagram of each flow regulating hole when the gate rotates in the third embodiment.

[0025] In the figure, the first channel 1, the syringe 2, the gate 3, the valve 4, the flow regulating hole 5, the gate axis 6, the gate insert 7, the gate movable narrow cavity 8, the gate 9, the gate moving mechanism 10, the rotating shaft 11, the power transmission component 12, the connecting rod 13, the slide groove 14, the slide rod 15, the driving rod 16, the rack 17, the gear body 18, the extension cavity 19, the mold assembly 20, and the template 21. DETAILED DESCRIPTION

[0026] Embodiment 1 like Figure 1-Figure 5 As shown, a flow rate regulating method for injecting molten material during injection molding, the molten material flows into the gate 3 through a syringe 2 having a first channel 1, and the flow rate of the gate 3 is regulated by a valve 4, and the valve 4 is provided with at least one flow rate regulating hole 5. By moving the valve 4, any flow rate regulating hole 5 is aligned or overlapped with the gate 3, and the flow rate is regulated according to the degree of alignment or overlap.

[0027] For example, the flow regulating hole 5 is divided into multiple sizes by configuring the flow regulating hole 5 in a partitioned manner.

[0028] In the present invention, the molten material flows into the gate 3 through a syringe 2 having a first channel 1. The syringe 2 is arranged inside one or more templates 21 constituting the mold assembly 20 and is connected to a manifold for distributing the molten material. The manifold is also installed inside the template 21, which is not shown in the drawings of this specification. The end of the syringe 2 is placed on the gate insert 7, and the gate insert 7 is provided with an orifice adapted to the end of the syringe 2, and the orifice has the gate 3.

[0029] In this embodiment, the degree of alignment or overlap between the flow regulating hole 5 and the gate 3 determines the actual orifice through which the molten material flows into the gate 3. By moving the valve 4, the flow regulating hole 5 can be gradually aligned with or overlapped with the gate 3 to change the degree of alignment or overlap between the flow regulating hole 5 and the gate 3 and adjust the flow rate according to the degree of alignment or overlap. When the flow regulating hole 5 completely overlaps with the gate 3, the actual orifice has the maximum opening, that is, the flow rate of the molten material is the largest, which helps to accurately control the flow rate of the molten material, thereby optimizing the material utilization efficiency and the final quality of the product.

[0030] During the movement of the valve 4, the actual orifice formed between the flow regulating hole 5 and the gate 3 always presents a symmetrical shape, and the molten material has almost no risk of irregular flow in the actual orifice. The flow path of the molten material will not be changed, so that accumulation and flow stagnation will not occur, ensuring that the disturbance to the flow of the molten material will not be increased.

[0031] The symmetrical actual orifice ensures uniform flow of the material in all directions, avoids uneven flow rate or material deformation caused by irregular flow, and makes the flow of the molten material more stable and controllable, which helps to reduce fluctuations and uncertainties in the production process, improves the stability and repeatability of production, and can quickly close the gate 3 by moving the valve 4, which is simple to operate and fast to close.

[0032] Specifically, combined with Figure 1-Figure 5 As shown, the flow regulating hole 5 is rotated by the rotation axis of the valve 4 so as to be close to or away from the gate 3, so that the flow regulating hole 5 and the gate 3 are aligned or overlapped.

[0033] The flow regulating hole 5 rotates through the rotation axis of the valve 4 so as to approach or move away from the gate 3. When the flow regulating hole 5 is away from the gate 3, the gate 3 is closed so that the molten material cannot flow into the gate 3. When the flow regulating hole 5 approaches the gate 3, the flow regulating hole 5 gradually aligns with or overlaps the gate 3 to change the degree of overlap between the flow regulating hole 5 and the gate 3 and adjust the flow according to the degree of alignment or overlap.

[0034] The process of aligning the flow regulating hole 5 with the gate 3 is gradual and continuous. The actual orifice formed between the flow regulating hole 5 and the gate 3 determines the instantaneous flow rate of the molten material, and the degree of alignment or overlap between the flow regulating hole 5 and the gate 3 is proportional to the rotation of the quasi-flow regulating hole 5, which facilitates the adjustment of the flow rate, making the metering of the inflow of molten material more accurate.

[0035] Specifically, combined with Figure 1 and Figure 2 As shown, the rotation axis of the valve 4 is parallel to the gate axis 6 of the gate 3 .

[0036] Preferably, the axis of the first channel 1 and the gate axis 6 are consistent with the central axis Y axis, the central axis Y axis is the polar symmetry axis of the first channel 1, and the rotation axis of the valve 4 is the W axis parallel to the Y axis.

[0037] Specifically, combined with Figure 1-Figure 5 As shown, the valve 4 has its rotation axis located outside.

[0038] like Figure 1-Figure 5As shown, a flow regulating valve for injecting molten material during injection molding comprises a gate insert 7 and a gate 3 arranged on the gate insert 7, a gate insert 7 is provided with a gate movable narrow cavity 8 connected with the gate 3, a flat gate 9 is provided in the gate movable narrow cavity 8, a plurality of flow regulating holes 5 penetrating through both ends of the gate 9 are provided on the gate 9, and the number of the flow regulating holes 5 is ≥1, the flow regulating holes 5 are used to connect the upper and lower ends of the gate 3, and the aperture of the flow regulating holes 5 is not larger than the aperture of the gate 3, the gate 9 is connected to the gate moving mechanism 10, and the position of the flow regulating hole 5 is changed by moving the gate 9, thereby changing the connection state of the gate 3.

[0039] The gate moving mechanism 10 can drive the gate 9 to move to change the position of the flow regulating hole 5 and thus change the connection state of the gate 3. The connection state is that the flow regulating hole 5 is aligned or overlapped with the gate 3, and the flow is adjusted according to the degree of alignment or overlap.

[0040] Specifically, combined with Figure 1-Figure 5 As shown, the gate moving mechanism 10 includes a rotating shaft 11 arranged outside the gate 9, the gate 9 is connected to a power transmission component 12, and a plurality of flow regulating holes 5 distributed circumferentially along the rotation center of the rotating shaft 11 are provided on the gate 9.

[0041] The power transmission assembly 12 can drive the gate 9 to rotate with the rotating shaft 11 as the rotating axis, so that any flow regulating hole 5 is aligned with or overlapped with the gate 3, and the flow is adjusted according to the degree of alignment or overlap.

[0042] Specifically, combined with Figure 5 As shown, the gate moving mechanism 10 includes a connecting rod 13 and a rotating shaft 11 arranged on the connecting rod 13. One end of the connecting rod 13 is connected to the gate 9. A sliding groove 14 is also provided on the connecting rod 13, which is offset from the rotation center of the rotating shaft 11. A sliding rod 15 is provided in the sliding groove 14, and the sliding rod 15 is connected to the driving rod 16.

[0043] The driving rod 16 can move back and forth along the axial direction of the driving rod 16 through the driver to drive the connecting rod 13 to rotate clockwise or counterclockwise around the rotating shaft 11, thereby aligning or overlapping any flow regulating hole 5 with the gate 3, and adjusting the flow according to the degree of alignment or overlap.

[0044] The drive is via pneumatic, hydraulic or electric actuators.

[0045] Preferably, combined Figure 1 and Figure 2 As shown, the rotating shaft 11 is parallel to the gate axis 6 of the gate 3. The rotation axis of the rotating shaft 11 is the W axis parallel to the Y axis.

[0046] Preferably, combined Figure 5 As shown, the driving rod 16 is distributed along the Z axis, and the Z axis is orthogonal to the plane passing through the Y axis.

[0047] Embodiment 2 like Figure 6 and Figure 7 As shown, the structure and working principle of this embodiment are basically the same as those of the first embodiment, except that the gate moving mechanism 10 includes an L-shaped connecting rod 13, one end of the connecting rod 13 is connected to the gate 9, and the other end is provided with a rotating shaft 11.

[0048] The L-shaped connecting rod 13 is convenient to be installed on the gate insert 7, and the rotating shaft 11 is installed in a rotating manner in the extension cavity 19 parallel to the gate movable narrow cavity 8. The driver can drive the rotating shaft 11 to rotate to drive the connecting rod 13 to swing, so that any flow regulating hole 5 is aligned or overlapped with the gate 3, and the flow can be adjusted according to the degree of alignment or overlap.

[0049] Embodiment 3 like Figure 8-Figure 13 As shown, the structure and working principle of this embodiment are basically the same as those of the first embodiment, except that a rotation axis is provided on the valve 4, there are multiple flow regulating holes 5 and they are distributed circumferentially along the rotation axis, and during the rotation of the valve 4 around the rotation axis, any flow regulating hole 5 can be aligned or overlapped with the gate 3 to adjust the flow of the molten material.

[0050] Preferably, combined Figure 9-13 As shown, the plurality of flow regulating holes 5 are isolated from each other and at least two of the flow regulating holes 5 have different apertures.

[0051] The flow regulating holes 5 are isolated from each other and at least two flow regulating holes 5 have different apertures, so that the injection flow rate of the molten material can be changed by aligning or overlapping the flow regulating holes 5 and the gate 3 of different apertures without changing the size of the syringe 2, which significantly simplifies the operating cost and tool cost, and can change the flow rate of the molten material while maintaining the actual orifice symmetry.

[0052] Preferably, combined Figure 9-13 As shown, a plurality of flow regulating holes 5 are distributed in an array along the circumference of the rotation axis.

[0053] During the injection cycle, the valve 4 rotates rapidly to enable the plurality of flow regulating holes 5 to be fully aligned or overlapped at the gate more than once to dynamically adjust the flow of the molten material.

[0054] Specifically, combined with Figure 9-13 As shown, the gate moving mechanism 10 includes a rack 17 and a gear body 18 . The gear body 18 is arranged on the side of the gate 9 , and the rotating shaft 11 is arranged on the gate 9 .

[0055] The driver can drive the rack 17 to move back and forth along the axial direction of the rack 17 to drive the tooth body 18 and the gate 9 to rotate counterclockwise or clockwise around the rotating shaft 11, thereby aligning or overlapping any flow regulating hole 5 with the gate 3, and adjusting the flow according to the degree of alignment or overlap.

[0056] Alternatively, the tooth body 18 is meshed with a driving tooth or a driving worm driven by a motor, and the rotation of the driving tooth or the driving worm is proportional to the rotation of the gate 9 .

[0057] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0058] Although this article uses the first channel 1, syringe 2, gate 3, valve 4, flow regulating hole 5, gate axis 6, gate insert 7, gate movable narrow cavity 8, gate 9, gate moving mechanism 10, rotating shaft 11, power transmission component 12, connecting rod 13, slide groove 14, slide rod 15, drive rod 16, rack 17, gear body 18, extension cavity 19, mold assembly 20, template 21, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A method for regulating the flow rate of molten material during injection molding, wherein the molten material flows into a gate (3) through a syringe (2) having a first channel (1), characterized in that: The flow rate of the gate (3) is adjusted by a valve (4), and at least one flow rate adjustment hole (5) is provided on the valve (4). By moving the valve (4), any one of the flow rate adjustment holes (5) is aligned with or overlapped with the gate (3), and the flow rate is adjusted according to the degree of alignment or overlap.

2. The flow rate regulating method for molten material injection during injection molding according to claim 1, characterized in that: The flow regulating hole (5) is rotated via the rotation axis of the valve (4) so ​​as to approach or move away from the gate (3), thereby achieving alignment or overlap between the flow regulating hole (5) and the gate (3).

3. The flow rate regulating method for molten material injection during injection molding according to claim 2, characterized in that: The rotation axis of the valve (4) is parallel to the gate axis (6) of the gate (3).

4. The flow rate regulating method for molten material injection during injection molding according to claim 3, characterized in that: The valve (4) is provided with a rotation axis; Alternatively, the rotation axis of the valve (4) is located outside the valve (4).

5. The flow rate regulating method for molten material injection during injection molding according to claim 4, characterized in that: There are a plurality of flow regulating holes (5) which are distributed circumferentially along the rotation axis.

6. The flow rate regulating method for molten material injection during injection molding according to claim 5, characterized in that: The plurality of flow regulating holes (5) are isolated from each other and at least two of the flow regulating holes (5) have different apertures.

7. The flow rate regulating method for molten material injection during injection molding according to claim 6, characterized in that: A plurality of flow regulating holes (5) are distributed in an array along the circumference of the rotation axis.

8. A regulating valve applicable to the method for regulating the flow rate of molten material injection during injection molding as claimed in any one of claims 1 to 7, comprising a gate insert (7) and a gate (3) arranged on the gate insert (7), characterized in that: The gate insert (7) is provided with a gate movable narrow cavity (8) connected to the gate (3), a flat gate (9) is provided in the gate movable narrow cavity (8), a plurality of flow regulating holes (5) penetrating the two ends of the gate (9) are provided on the gate (9), and the number of the flow regulating holes (5) is ≥1, the flow regulating holes (5) are used to connect the upper and lower ends of the gate (3), and the aperture of the flow regulating holes (5) is not larger than the aperture of the gate (3), the gate (9) is connected to the gate moving mechanism (10), and the position of the flow regulating holes (5) is changed by moving the gate (9), thereby changing the connection state of the gate (3).

9. The regulating valve according to claim 8, wherein the gate moving mechanism (10) comprises a rotating shaft (11) arranged on the gate (9) or outside the gate (9), the gate (9) is connected to a power transmission component (12), and a plurality of flow regulating holes (5) are arranged on the gate (9) and distributed circumferentially along the rotation center of the rotating shaft (11).

10. The regulating valve according to claim 9, wherein the gate moving mechanism (10) comprises a connecting rod (13) and the rotating shaft (11) arranged on the connecting rod (13), one end of the connecting rod (13) is connected to the gate (9), a sliding groove (14) deviating from the rotation center of the rotating shaft (11) is further provided on the connecting rod (13), a sliding rod (15) is provided in the sliding groove (14), and the sliding rod (15) is connected to the driving rod (16); Alternatively, the gate moving mechanism (10) comprises an L-shaped connecting rod (13), one end of the connecting rod (13) is connected to the gate (9), and the other end is provided with the rotating shaft (11); Alternatively, the gate moving mechanism (10) comprises a rack (17) and a tooth body (18), the tooth body (18) is arranged on the side of the gate (9), and the rotating shaft (11) is arranged on the gate (9).

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