Injection molding device of internal spiral umbrella skirt structure

Abstract

The utility model provides an injection molding device of an internal spiral umbrella skirt structure. The injection molding device comprises a supporting column pipe, a spiral mold core, a plug, a mold head, a supporting assembly and a rotating mechanism. One end of the supporting column pipe is connected with the die head in a sealing manner; the spiral core and the die head are connected and coaxial, and the spiral core is arranged in the supporting column pipe; the plug is connected into the supporting column pipe in a sealed mode and used for being connected with the end, away from the die head, of the spiral core in an abutting mode so that a pouring cavity can be defined by the plug, the supporting column pipe, the spiral core and the die head; the die head is rotationally connected to the supporting assembly, and a pouring channel communicating with the pouring cavity is formed in the die head. And the slewing mechanism is connected with the die head and is used for driving the die head to rotate so as to demold. Demolding of the inner spiral umbrella skirt structure is achieved through rotation of the mold head, the inner spiral umbrella skirt structure is obtained through injection molding, the production efficiency is high, the combined part is not prone to aging and cracking, and the overall strength is good.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, and in particular to an injection molding device with an inner spiral umbrella skirt structure. Background Technology

[0002] With the rapid development of power transmission and transformation projects, the voltage levels of power transmission are becoming increasingly higher. This necessitates larger power facilities as fundamental components for transmission and transformation to ensure the stable operation of the transmission and transformation system. However, the large-diameter composite hollow insulators currently in use generally have smooth inner walls. This smoothness can lead to insufficient creepage distance, affecting the physical and electrical properties of the large-diameter hollow insulators and thus their practical application. Therefore, to solve these problems, a composite hollow insulator with awnings on the inner wall has been proposed.

[0003] In the existing technology, the sheds of post insulators are mostly assembled in sections or externally molded, which has problems such as low production efficiency, easy aging and cracking at the joints, and insufficient overall strength. In particular, for the internal spiral sheds with complex internal structure design, the manufacturing difficulty is greater and the cost is higher. Utility Model Content

[0004] In view of this, the present invention proposes an injection molding device for an internal spiral umbrella skirt structure to solve the technical problems mentioned in the background art, such as low production efficiency, easy aging and cracking of joint parts, and insufficient overall strength, which are mostly achieved by segmented assembly or external molding of the umbrella skirts of post insulators.

[0005] The technical solution of this utility model is implemented as follows:

[0006] This utility model provides an injection molding device for an internal spiral umbrella skirt structure, including a support tube, a spiral core, a plug, a mold head, a support assembly, and a rotary mechanism, wherein:

[0007] One end of the support tube is sealed to the mold head;

[0008] The spiral core is connected to and coaxial with the mold head, and the spiral core is placed in the support tube;

[0009] The plug is sealed and connected in the support tube, and is used to abut against the end of the spiral core away from the mold head, so as to form a casting cavity with the support tube, the spiral core and the mold head;

[0010] The mold head is rotatably connected to the support assembly, and a casting channel communicating with the casting cavity is provided inside the mold head;

[0011] The rotary mechanism is connected to the mold head and is used to drive the mold head to rotate for demolding.

[0012] Based on the above technical solutions, preferably, the outer diameter of the spiral core gradually increases from the end away from the mold head to the end closer to the mold head.

[0013] Based on the above technical solutions, preferably, the casting channel includes a main pouring port and two branch channels connecting the casting cavity. The main pouring port is connected to an external injection molding machine, and the two branch channels are both connected to the main pouring port and located on both sides of the mold head axis.

[0014] Based on the above technical solutions, preferably, the rotary mechanism includes a rotary motor and a drive gear, the rotary motor is drivenly connected to the drive gear, and the outer circle of the die head is provided with a driven gear ring, which is drivenly connected to the drive gear.

[0015] Based on the above technical solutions, preferably, the support assembly includes at least two support rollers, which are supported below the die head, and the two support rollers are respectively located on both sides of the vertical symmetrical center plane of the die head.

[0016] Based on the above technical solutions, preferably, the central axis of the driven gear ring is coaxial with the central axis of the die head, and the driving gear is located between the two support rollers.

[0017] Based on the above technical solutions, preferably, the rotary mechanism further includes a transition gear, which meshes with the driving gear and the driven gear ring respectively.

[0018] Based on the above technical solutions, preferably, the cross-section of the spiral core is provided with multiple trapezoidal notches to form an inner spiral umbrella skirt structure.

[0019] Based on the above technical solutions, preferably, the distance from the bottom of the multiple trapezoidal notches to the spiral core gradually increases from the end away from the mold head to the end closer to the mold head.

[0020] The injection molding device for the inner spiral umbrella skirt structure of this utility model has the following advantages over the prior art:

[0021] (1) The plug is sealed and connected to the support tube, and abuts against the end of the spiral core away from the mold head, so as to form a casting cavity with the support tube, the spiral core and the mold head. The mold head is provided with a casting channel that connects to the casting cavity. The rubber material is injected through the casting channel to complete the injection molding. The rotary mechanism drives the mold head to rotate to realize the demolding of the inner spiral umbrella skirt structure. The inner spiral umbrella skirt structure is demolded by the rotation of the mold head. The injection molding obtains the inner spiral umbrella skirt structure, which has high production efficiency, is not easy to age and crack at the joint, and has good overall strength.

[0022] (2) By gradually increasing the outer diameter of the spiral core from the end away from the mold head to the end closer to the mold head, the axial direction of the spiral core becomes tapered, which facilitates demolding operation, improves the reliability of demolding, thereby improving the quality of the obtained inner spiral umbrella skirt structure, and can also improve the fluidity of the rubber material, increase the injection length, realize the injection of a longer inner spiral umbrella skirt structure, and improve the application range.

[0023] (3) The casting channel includes a main sprue and two branch channels connecting the casting cavity. The main sprue is connected to an external injection molding machine. The two branch channels are connected to the main sprue and located on both sides of the mold head axis. The design of the two branch channels can optimize the flow path of the rubber material, reduce the injection pressure and shorten the injection cycle.

[0024] (4) The drive gear is driven to rotate by a rotary motor, which in turn drives the driven gear ring to rotate, thereby realizing the rotation of the mold head. During the rotation of the mold head, the inner spiral umbrella skirt structure moves away from the mold head, thereby completing the demolding operation. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the injection molding device for the inner spiral umbrella skirt structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the transmission of the injection molding device for the inner spiral umbrella skirt structure of this utility model;

[0028] Figure 3 This is a flowchart illustrating the motion control principle of the rotary mechanism of the injection molding device for the inner spiral umbrella skirt structure of this utility model.

[0029] Explanation of reference numerals in the attached drawings: 1-support tube, 2-spiral core, 3-plug, 4-mold head, 5-support assembly, 6-rotation mechanism;

[0030] 100 - Casting cavity;

[0031] 21-Trapezoidal notch;

[0032] 41-Pouring channel, 411-Main pouring port, 412-Branch channel, 42-Driven gear ring;

[0033] 51-Support roller;

[0034] 61-Rotary motor, 62-Drive gear, 63-Transition gear. Detailed Implementation

[0035] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0036] Reference Figures 1-3 As shown in the embodiment of this utility model, an injection molding device for an inner spiral umbrella skirt structure is proposed, including a support tube 1, a spiral core 2, a plug 3, a mold head 4, a support assembly 5, and a rotary mechanism 6, wherein:

[0037] One end of the support tube 1 is sealed to the mold head 4;

[0038] The spiral core 2 is connected to and coaxial with the mold head 4, and the spiral core 2 is placed in the support tube 1;

[0039] The plug 3 is sealed and connected in the support tube 1, and is used to abut against the end of the spiral core 2 away from the mold head 4, so as to form a casting cavity 100 with the support tube 1, the spiral core 2 and the mold head 4; during the injection molding process, a long rod can be inserted into the support tube 1 to push the plug 3 to abut against the spiral core 2. After the injection molding is completed, the long rod can be removed to facilitate the inner spiral umbrella skirt structure to move away from the mold head 4 during demolding;

[0040] The mold head 4 is rotatably connected to the support assembly 5, and the mold head 4 is provided with a casting channel 41 that connects to the casting cavity 100;

[0041] The rotary mechanism 6 is connected to the mold head 4 and is used to drive the mold head 4 to rotate for demolding.

[0042] It should be noted that the main component of the rubber compound is polydimethylsiloxane, and appropriate fillers and additives are added to adjust its hardness and rheological properties. At the same time, the types and proportions of crosslinking agents (such as vinylsilane) and catalysts (such as platinum catalysts) are determined to form a formulation suitable for injection molding.

[0043] The injection molding device for the inner spiral umbrella skirt structure proposed in this embodiment is sealed and connected to the support tube 1 through the plug 3, and abuts against the end of the spiral core 2 away from the mold head 4, so that the support tube 1, the spiral core 2 and the mold head 4 form a casting cavity 100. The mold head 4 is provided with a casting channel 41 that connects to the casting cavity 100. The injection molding is completed by injecting the rubber material through the casting channel 41. The rotary mechanism 6 drives the mold head 4 to rotate, so as to realize the demolding of the inner spiral umbrella skirt structure. The inner spiral umbrella skirt structure is demolded by rotating the mold head 4. The injection molding of the inner spiral umbrella skirt structure has high production efficiency, the joint is not easy to age and crack, and the overall strength is good.

[0044] In some embodiments, the outer diameter of the spiral core 2 gradually increases from the end furthest from the mold head 4 to the end closest to the mold head 4. This gradual increase in the outer diameter of the spiral core 2 creates an axial taper, facilitating demolding, reducing frictional damage during demolding, ensuring the quality of the molded surface, and improving demolding reliability. This, in turn, improves the quality of the resulting inner spiral skirt structure, enhances the flowability of the rubber compound, increases the injection molding length, enables the injection molding of longer inner spiral skirt structures, and expands its applicability.

[0045] In some embodiments, after molding and cooling, a very small gap appears between the inner spiral skirt structure and the mold wall. However, with a simple unidirectional rotation method, the part near the casting channel 41 is easily separated from the spiral core 2. But in the deeper part of the spiral core 2 (near the middle and rear), as the contact friction between the inner spiral skirt structure and the spiral core 2 increases, torsional deformation occurs in the loosened part at the front, affecting the radial relaxation in the deeper part, making demolding difficult, or even impossible to achieve safe and damage-free rotational demolding. This utility model uses the forward and reverse rotation of the mold head 4 to eliminate the frictional torque between the part and the spiral core 2, which is a scientific demolding method with simple operability. When the forward rotation causes part of the skirt root to loosen and detach, it is randomly changed to a brief reverse rotation, causing the inner spiral skirt structure to be compressed by a very small size, thereby widening the gap between the spiral core 2 and the inner spiral skirt structure. This very small deformation can slightly expand under normal atmospheric pressure after demolding and naturally recover its size. After repeated forward and reverse rotations, the part of the inner spiral umbrella skirt structure near the main sprue 411 (front part) then increases the gap between the middle and rear part of the inner spiral umbrella skirt structure and the spiral core 2. In particular, the root and skirt edge of the inner spiral umbrella skirt structure separate from the spiral core 2, laying the foundation for the final continuous demolding rotation.

[0046] like Figure 3As shown, the determination of whether the inner spiral skirt structure has detached from the spiral core 2 is made by monitoring the torque of the servo motor in the rotary mechanism 6. The torque of the servo motor is positively correlated with the instantaneous current of the motor. By monitoring the instantaneous current of the motor, the frictional torque between the inner spiral skirt structure and the spiral core 2 can be determined. The forward and reverse rotation speed and time are controlled by the servo control system of the rotary mechanism 6. Forward rotation generates tension, and reverse rotation generates pressure on the parts. Their limiting parameter is that the rotational stiffness θ of the formed inner spiral skirt structure is less than the rated torque value Ns of the material selected in the design of the inner spiral skirt structure. That is, the safe torsional stiffness value of the inner spiral skirt structure is calculated by back-calculating the detected torque value to ensure quality and safety. When Ns is less than the calculated frictional torque Nx between the inner spiral skirt structure and the spiral core 2, it can be determined that the entire process has been detached, and continuous demolding and rotation can continue. The forward and reverse rotation time and torque are monitored by the computer control system of the rotary mechanism 6.

[0047] In some embodiments, the casting channel 41 includes a main gating port 411 and two runners 412 connecting to the casting cavity 100. The main gating port 411 is connected to an external injection molding machine, and the two runners 412 are both connected to the main gating port 411 and located on both sides of the axis of the mold head 4. By including the main gating port 411 and the two runners 412 connecting to the casting cavity 100, the design of the two runners 412 optimizes the flow path of the plastic material, reduces injection pressure, and shortens the injection cycle.

[0048] In some embodiments, the rotary mechanism 6 includes a rotary motor 61 and a drive gear 62. The rotary motor 61 is drivenly connected to the drive gear 62. A driven gear ring 42 is provided on the outer circumference of the mold head 4, and the driven gear ring 42 is drivenly connected to the drive gear 62. By driving the drive gear 62 to rotate through the rotary motor 61, the driven gear ring 42 is driven to rotate, thereby realizing the rotation of the mold head 4. During the rotation of the mold head 4, the inner spiral umbrella skirt structure moves away from the mold head 4, thereby completing the demolding operation.

[0049] In some embodiments, the support assembly 5 includes at least two support rollers 51, which are supported below the die head 4. The two support rollers 51 are respectively located on both sides of the vertical symmetry center plane of the die head 4. By having the two support rollers 51 respectively located on both sides of the vertical symmetry center plane of the die head 4 and supporting the die head 4 below it, the die head 4 can rotate smoothly when the rotary motor 61 is working, improving reliability and stability.

[0050] In some embodiments, the central axis of the driven gear ring 42 is coaxial with the central axis of the die head 4, and the driving gear 62 is located between the two support rollers 51. Because the central axis of the driven gear ring 42 is coaxial with the central axis of the die head 4, the two ends of the die head 4 are symmetrical about the driven gear ring 42. When the driving gear 62 drives the driven gear ring 42 to rotate, the torque exerted on the driven gear ring 42 by the two ends of the die head 4 is the same and can cancel each other out, thereby improving the lifespan of the driven gear ring 42.

[0051] In some embodiments, the rotary mechanism 6 further includes a transition gear 63, which meshes with both the driving gear 62 and the driven gear ring 42. By having the transition gear 63 mesh with both the driving gear 62 and the driven gear ring 42, the distance between the driving gear 62 and the driven gear ring 42 can be increased, thereby increasing the installation space for the rotary motor 61, avoiding installation interference, and improving reliability.

[0052] In some embodiments, the cross-section of the spiral core 2 is provided with a plurality of trapezoidal notches 21 to form an inner spiral umbrella skirt structure. The trapezoidal notches 21 on the cross-section of the spiral core 2 correspond in shape to the umbrella skirt of the inner spiral umbrella skirt structure, and the trapezoidal notches 21 facilitate demolding.

[0053] In some embodiments, the distance from the bottom of the plurality of trapezoidal notches 21 to the spiral core 2 gradually increases from the end away from the mold head 4 to the end closer to the mold head 4. This configuration improves the flowability of the rubber compound, increases the injection molding length, enables the injection molding of longer inner spiral skirt structures, and expands the applicability range.

[0054] The working principle of the injection molding device for the inner spiral umbrella skirt structure is as follows:

[0055] Injection molding is completed by injecting the adhesive material through the pouring channel 41;

[0056] The forward and reverse rotation of the mold head 4 is achieved by the forward and reverse rotation of the rotary motor 61. When the forward rotation causes part of the umbrella skirt root to loosen and detach, it is randomly switched to a brief reverse rotation, which compresses the inner spiral umbrella skirt structure by a very small size, thereby expanding the gap between the spiral core 2 and the inner spiral umbrella skirt structure. This very small deformation can expand slightly under normal atmospheric pressure after demolding and naturally recover its size. After repeated forward and reverse rotations, the gap between the inner spiral umbrella skirt structure near the main sprue 411 (front part) and then the middle and rear part of the inner spiral umbrella skirt structure and the spiral core 2 increases.

[0057] The rotary motor 61 drives the mold head 4 to rotate continuously in the forward direction, causing the inner spiral umbrella skirt structure to move away from the mold head 4, thus achieving continuous demolding.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An injection molding device for an inner spiral umbrella skirt structure, characterized in that, Includes support tubes, spiral cores, plugs, mold heads, support components, and a rotating mechanism, among which: One end of the support tube is sealed to the mold head; The spiral core is connected to and coaxial with the mold head, and the spiral core is placed in the support tube; The plug is sealed and connected in the support tube, and is used to abut against the end of the spiral core away from the mold head, so as to form a casting cavity with the support tube, the spiral core and the mold head; The mold head is rotatably connected to the support assembly, and a casting channel communicating with the casting cavity is provided inside the mold head; The rotary mechanism is connected to the mold head and is used to drive the mold head to rotate for demolding.

2. The injection molding apparatus for the inner spiral umbrella skirt structure as described in claim 1, characterized in that, The outer diameter of the spiral core gradually increases from the end furthest from the mold head to the end closest to the mold head.

3. The injection molding apparatus for the inner spiral umbrella skirt structure as described in claim 2, characterized in that, The casting channel includes a main gating port and two branch channels connecting to the casting cavity. The main gating port is connected to an external injection molding machine, and the two branch channels are both connected to the main gating port and located on both sides of the mold head axis.

4. The injection molding apparatus for the inner spiral umbrella skirt structure as described in claim 1, characterized in that, The rotary mechanism includes a rotary motor and a drive gear. The rotary motor is driven and connected to the drive gear. The outer circle of the die head is provided with a driven gear ring, which is driven and connected to the drive gear.

5. The injection molding apparatus for the inner spiral umbrella skirt structure as described in claim 4, characterized in that, The support assembly includes at least two support rollers, which are supported below the die head, and the two support rollers are respectively located on both sides of the vertical symmetry center plane of the die head.

6. The injection molding apparatus for the inner spiral umbrella skirt structure as described in claim 5, characterized in that, The central axis of the driven gear ring is coaxial with the central axis of the die head, and the driving gear is located between the two support rollers.

7. The injection molding apparatus for the inner spiral umbrella skirt structure as described in claim 6, characterized in that, The rotary mechanism also includes a transition gear, which meshes with the driving gear and the driven gear ring, respectively.

8. The injection molding apparatus for the inner spiral umbrella skirt structure as described in any one of claims 1-7, characterized in that, The cross-section of the spiral core has multiple trapezoidal notches to form an inner spiral umbrella skirt structure.

9. The injection molding apparatus for the inner spiral umbrella skirt structure as described in claim 8, characterized in that, The distance from the bottom of the multiple trapezoidal notches to the spiral core gradually increases from the end away from the mold head to the end closer to the mold head.

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