Cold shrink cable accessory forming device and forming method

Abstract

The present invention discloses a cold-shrink cable accessory molding device and molding method, which relate to the technical field of cold-shrink cable accessory molding. The cold-shrink cable accessory molding device comprises: an injection molding machine; a mold assembly, wherein the mold assembly is arranged on the injection molding machine, and comprises a movable platen and a fixed platen that cooperate with each other, and the movable platen and the fixed platen are respectively provided with an adaptive cavity; a core rod structure, wherein the core rod structure is arranged between the movable platen and the fixed platen, and is used to form the internal cavity of the cold-shrink cable terminal, and comprises a truncated cone-shaped annular sleeve, which has a gradually expanding taper from front to back in the axial direction. By adopting a core rod structure with a radial contraction function, the contact pressure between the core rod structure and the inner cavity of the molded cold-shrink cable terminal can be significantly reduced, thereby greatly reducing the friction resistance between the two, and avoiding defects such as material tearing, deformation or surface damage caused by forced pulling during the demolding process.

Description

Technical Field

[0001] The present invention relates to the technical field of cold-shrink cable accessories molding, in particular to a cold-shrink cable accessories molding device and molding method. Background Art

[0002] Cold shrink cable accessories are high-performance insulation components designed for power cable terminals and intermediate joints, and are widely used in power transmission and distribution systems, industrial facilities and other fields. These accessories mainly include cold shrink cable terminals, intermediate joints, branch joints and other products. Among them, cold shrink cable terminals are mainly used for insulation and sealing of cable ends. They usually have a conical shape and an umbrella skirt structure on their outer surface (such as Figure 14 As shown in the figure, the main molding method is injection molding, which injects the molten rubber material into a preset mold and forms a product of a specific shape after cooling.

[0003] However, the current cold shrink cable terminals still have the following problems during the molding process:

[0004] After the cold-shrink cable terminal is injection-molded, the traditional process usually requires manual removal of the product from the core rod with the assistance of air blowing. However, due to the large contact area and surface friction between the inner cavity of the cold-shrink cable terminal and the outer wall of the core rod, and the fact that a local vacuum environment is easily formed at the moment of demolding, a significant vacuum adsorption effect occurs, making it difficult for the product to be smoothly and evenly separated from the core rod surface. In this case, if forced pulling and demolding are performed manually, it is very easy to cause quality defects such as material tearing, end deformation or surface scratches, which not only affects the appearance integrity of the product, but may also damage its internal structural performance, thereby reducing the product qualification rate.

[0005] During the mold separation process, when the core rod drives the formed cold-shrink cable terminal to separate from the upper and lower cavities, if a rigid direct separation method is used, due to the strong adhesion and local sticking between the product and the cavity, it is very easy to cause defects such as uneven demolding, surface scratches or structural deformation, which not only affects the appearance quality and smoothness of the product, but may also cause dimensional deviations, resulting in a low yield rate. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the present invention provides a cold-shrink cable accessory forming device and forming method, which solve the problems raised in the background art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a cold shrink cable accessory molding device, comprising: an injection molding machine; a mold assembly, the mold assembly is arranged on the injection molding machine, including a movable template and a fixed template that cooperate with each other, and the movable template and the fixed template are respectively provided with an adaptive cavity; a core rod structure, the core rod structure is arranged between the movable template and the fixed template, and is used to form the internal cavity of the cold shrink cable terminal, including a truncated cone-shaped annular sleeve, which has a gradually expanding taper from front to back along the axial direction; a support bar, the support bar is installed on the inner side of the annular sleeve, and a support column is provided inside the annular sleeve to slide with the support bar, an oblique groove is opened inside the support bar, and an insertion rod is provided inside the oblique groove, and the insertion rod can move from front to back along the oblique groove. During injection molding, the annular sleeve, the support bar and the support column cooperate with each other to form a complete core rod shape. During mold separation, as the insertion rod moves backward along the oblique groove, the support column synchronously moves relative to the annular sleeve and the support bar, so that the annular sleeve can smoothly achieve radial inward shrinkage movement.

[0008] Furthermore, the core rod structure is arranged on the front side of the movable plate, the insertion rod is installed on the rear side of the connecting plate, the connecting plate is fixedly connected to the support column through an arc support plate, and a rotating column that movably passes through the movable plate is installed at the rear end of the support column, a spiral groove is provided on the rotating column, and a protrusion that slides with the spiral groove is installed inside the movable plate; a wedge block 1 is installed after the rotating column passes through the movable plate, a sliding groove is provided on the inclined surface of the wedge block 1, and a wedge block 2 is slidably arranged on the inclined surface of the wedge block 1, and the inclined surface of the wedge block 2 slides with the sliding groove through a slider, and a connecting frame connected to the movable template is installed on the upper end of the wedge block 2.

[0009] Furthermore, elastic telescopic rods are provided on both sides of the wedge-shaped block 1, and balls are rollingly installed on the telescopic ends of the elastic telescopic rods. Evenly distributed circular grooves are opened on both sides of the wedge-shaped block 1, and the balls roll in cooperation with the circular grooves. The elastic telescopic rods are fixedly connected to the connecting frame through the support frame.

[0010] Furthermore, the fixed template and the movable template are both provided with fixed grooves that cooperate with the movable plate, and the bottom wall of the fixed groove is installed with fixed columns that cooperate with the movable plate and the movable template to slide up and down. The upper and lower sides of the movable plate are both provided with support springs that are sleeved on the outside of the fixed columns, and the upper end of the fixed template is also installed with a guide column that cooperates with the movable template to slide up and down.

[0011] Furthermore, the cavity structures on the fixed template and the movable template are the same, and both the fixed template and the movable template are provided with installation grooves that slide up and down with the corresponding cavities, and evenly distributed installation springs are connected between the cavities and the walls of the installation grooves.

[0012] Furthermore, both the fixed template and the movable template are provided with arc-shaped grooves, which cooperate with the corresponding support columns and arc-shaped support plates. A semi-annular plate that cooperates with the end of the annular sleeve is provided inside the arc-shaped groove. A rectangular groove that slides with the semi-annular plate is provided on the bottom wall of the arc-shaped groove, and a reset spring connected to the semi-annular plate is installed in the rectangular groove.

[0013] Furthermore, an arc-shaped push plate is installed on the side of the semi-annular plate away from the cavity, and the arc-shaped push plate is inclined outward on the side away from the semi-annular plate. The corresponding support column and the outer side of the arc-shaped support plate are provided with a pressure ring, and the side of the pressure ring close to the annular sleeve is axially retracted, wherein the pressure ring located on the rear side is rotatably connected to the movable plate, and a connecting block is connected between the pressure ring and the annular sleeve, and an avoidance groove for avoiding the connecting block is opened on the semi-annular plate.

[0014] Furthermore, circular through holes are provided on the left and right sides of the fixed template and the movable template, the circular through holes are connected to the mounting grooves, and a knocking rod is provided inside the circular through hole, which can move back and forth left and right along the circular through hole.

[0015] Furthermore, a guide groove plate is installed at the end of the knocking rod away from the cavity, a rotating wheel is provided on the rear side of the guide groove plate, a control column slidingly matched with the guide groove plate is installed at the eccentric position of the rotating wheel, a rotating shaft is installed at the rear end of the control column, a rotating gear is fixedly mounted on the rotating shaft, and the upper and lower corresponding rotating gears are staggered on the left and right, and rack plates are installed on both the fixed template and the movable template, wherein the rack plate on the fixed template is meshed with the rotating gear on the movable template, and the rack plate on the movable template is meshed with the rotating gear on the fixed template.

[0016] The present invention also provides a cold shrink cable accessory molding method, which is applicable to a cold shrink cable accessory molding device and comprises the following steps:

[0017] Step 1: Place the mold assembly in the injection molding machine. The hydraulic system in the injection molding machine drives the movable platen down to fit tightly with the fixed platen. The clamping unit completes the clamping. At this time, the core rod structure is located between the upper and lower cavities, forming a mold cavity consistent with the shape and size of the required cold shrink cable terminal.

[0018] Step 2: Preheat the mold through the heating system to ensure that the mold temperature reaches the set value.

[0019] Step 3: Start the injection unit of the injection molding machine and inject the fully plasticized plastic raw material into the mold cavity formed by the movable mold plate and the fixed mold plate at high pressure and high speed, so that the molten material evenly fills the entire mold cavity.

[0020] Step 4: After the injection is completed, the cooling system is immediately started to quickly cool the mold so that the molten material in the mold cavity is quickly cooled and solidified to form the required preliminary shape of the cold shrink cable terminal.

[0021] Step 5: Open the mold assembly, and the fixed platen, core rod structure and movable platen are separated from each other. The core rod structure drives the solidified cold shrink cable terminal away from the fixed platen. During this process, the core rod structure performs rotational motion and radial inward movement to assist the finished product to smoothly separate from the core rod structure.

[0022] Step 6: Use special expansion equipment to moderately expand the formed cold shrink cable terminal and place supports inside it to maintain its expanded state until the supports are removed for actual use.

[0023] The present invention has the following beneficial effects:

[0024] (1) The cold shrink cable accessory forming device, by adopting a core rod structure with radial contraction function, can significantly reduce the contact pressure between the core rod structure and the inner cavity of the formed cold shrink cable terminal, thereby greatly reducing the friction resistance between the two, avoiding defects such as material tearing, deformation or surface damage caused by forced pulling during the demoulding process. At the same time, the radial contraction of the core rod structure can form a certain gap compensation effect, so that the inner wall of the formed cable terminal and the core rod structure have an initial separation trend, further improving the stability and consistency of the initial stage of demoulding, and improving the overall production efficiency and product qualification rate.

[0025] (2) The cold shrink cable accessory forming device can rotate spirally while the core rod structure is performing the inward shrinking action. This composite motion can further destroy the vacuum adsorption effect and friction locking phenomenon that may exist between the formed cold shrink cable terminal and the core rod structure, ensuring that subsequent products can be smoothly and evenly separated from the core rod structure, reducing the possibility of surface scratches and defects. In addition, the slight vibration of the core rod structure can further cause the cold shrink cable terminal attached to the core rod structure to loosen, effectively reducing the friction between it and the core rod structure.

[0026] (3) In the process of parting the mold, the upper and lower cavities of the cold shrink cable accessories molding device tend to move toward each other. This movement process provides a certain inertial thrust for the product during the synchronous separation of the molded cold shrink cable terminal product driven by the core rod structure, so that it is relatively separated from the cavity surface, effectively reducing the friction resistance between the two. At the same time, this structural design can prevent defects such as strain and deformation caused by adhesion or jamming when the product is opened, significantly improving the surface finish and overall molding quality of the product. In addition, by applying periodic mechanical impact to the cavity through the knocking rod, the vibration energy generated can quickly destroy the adhesion effect between the product and the cavity due to cooling shrinkage or vacuum adsorption, causing the product to loosen slightly, significantly reducing the demoulding resistance, and improving the subsequent demoulding quality and efficiency.

[0027] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall diagram of the present invention;

[0029] Figure 2 Schematic diagram of the three-dimensional structure of the mold assembly in the present invention;

[0030] Figure 3 It is a partial rear structural schematic diagram of the mold assembly in the present invention;

[0031] Figure 4 For the present invention Figure 2 Schematic diagram of the cross-sectional plan structure;

[0032] Figure 5 It is a schematic diagram of a partial cross-sectional structure of the movable template in the present invention;

[0033] Figure 6 Schematic diagram of the three-dimensional structure of the knocking rod, guide groove plate and rotating wheel in the present invention;

[0034] Figure 7 Schematic diagram of the three-dimensional structure of the core rod structure and the movable plate in the present invention;

[0035] Figure 8 For the present invention Figure 7 A magnified schematic diagram of area A in the middle;

[0036] Figure 9 Schematic diagram of the three-dimensional structure of the rotating column, wedge-shaped block 1 and wedge-shaped block 2 in the present invention;

[0037] Figure 10 It is a partial cross-sectional structural schematic diagram of the core rod structure of the present invention;

[0038] Figure 11 Schematic diagram of the three-dimensional structure of the annular sleeve and the support bar in the present invention;

[0039] Figure 12 Schematic diagram of the three-dimensional structure of the support column and the insertion rod in the present invention;

[0040] Figure 13 Schematic diagram of the coordination relationship between the support bars and the support columns in the present invention;

[0041] Figure 14 This is a schematic diagram of the three-dimensional structure of the cold-shrink cable terminal product formed by the present invention.

[0042] In the figure, 1, injection molding machine; 2, mold assembly; 21, movable plate; 211, cavity; 212, mounting groove; 213, mounting spring; 214, positioning plate; 215, positioning hole; 216, arc groove; 217, semi-annular plate; 218, rectangular groove; 219, return spring; 22, fixed plate; 220, arc push plate; 221, pressure ring; 222, knock rod; 223, guide groove plate; 224, runner; 225, control column; 226, rotating shaft; 227, rotating gear; 228, rack plate; 23, core rod structure; 231, Annular sleeve; 232, support bar; 233, support column; 234, oblique groove; 235, insertion rod; 236, movable plate; 237, fixed groove; 238, fixed column; 239, support spring; 240, guide column; 241, connecting plate; 242, arc-shaped support plate; 243, rotating column; 244, spiral groove; 245, protrusion; 246, wedge block 1; 247, slide groove; 248, wedge block 2; 249, slider; 250, connecting frame; 251, elastic telescopic rod; 252, rolling ball; 253, circular groove; 254, support frame. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] Refer to the following Figure 1 - Figure 14 , describing a cold shrink cable accessory molding device and molding method provided by an embodiment of the present invention.

[0046] In one aspect, the present invention provides a cold shrink cable accessory forming device.

[0047] See also Figure 1The cold-shrink cable accessory molding device includes an injection molding machine 1, which is composed of a mold assembly 2, an injection unit, a clamping unit, a hydraulic system and a control system. These parts work together to complete the injection molding process of the cold-shrink cable terminal. Among them, the mold assembly 2 is used to define the shape and structure of the product; the injection unit is responsible for injecting the heated and molten plastic material into the mold assembly 2; the clamping unit provides sufficient closing pressure to ensure that the mold assembly 2 is stably closed during the injection molding process; the hydraulic system is used to drive the mold assembly 2 to open and close; and the control system is used to coordinate the actions of various components and control molding parameters.

[0048] See also Figure 2 Specifically, the mold assembly 2 can be fixed to the injection molding machine 1 in a detachable installation manner, and the mold assembly 2 can be flexibly replaced according to different product types. The mold assembly 2 includes a movable plate 21 and a fixed plate 22 that cooperate with each other. The hydraulic system can drive the movable plate 21 to move closer to or away from the fixed plate 22 to realize the opening and closing action of the mold assembly 2. The movable plate 21 and the fixed plate 22 are respectively provided with an adaptive cavity 211. When the movable plate 21 and the fixed plate 22 are closed, the cavities 211 of the two together enclose a mold cavity space that is consistent with the shape and size of the cold shrink cable terminal to be molded, which is used for accurately molding the outer contour of the product (cold shrink cable terminal products such as Figure 14 shown).

[0049] See also Figure 2 、 Figure 4 and Figure 10-13 In addition, a core rod structure 23 is provided between the movable template 21 and the fixed template 22, which is used to form the internal cavity of the cold shrink cable terminal during the injection molding process, including a truncated cone-shaped annular sleeve 231, which has a gradually expanding taper from front to back along the axial direction. This structure can better match the inner cavity shape of the cold shrink cable terminal product. Support bars 232 are evenly installed on the inner wall of the annular sleeve 231. A support column 233 that slides with the support bar 232 is also provided inside the annular sleeve 231. The support column 233 can move from front to back along the support bar 232 and the annular sleeve 231. During injection molding, the annular sleeve 231, the support bar 232 and the support column 233 cooperate to form a core rod shape with a complete structure and stable shape.

[0050] In addition, an oblique groove 234 is provided inside the support bar 232, which extends axially and is inclined toward the end of the annular sleeve 231 with a larger diameter. An insertion rod 235 is provided inside the oblique groove 234, and the insertion rod 235 can move from front to back along the oblique groove 234. During the mold separation process, due to the inclined design of the oblique groove 234, when the insertion rod 235 moves backward, it transmits a force with the groove wall of the oblique groove 234, pushing the support bar 232 to produce an inward displacement trend, thereby driving the annular sleeve 231 as a whole to achieve a slight radial inward contraction, and the support column 233 synchronously moves along the annular sleeve 231 and the support bar A relative sliding displacement occurs between 232, further prompting the annular sleeve 231 to complete the radial contraction action. First, the contraction action can effectively reduce the contact pressure between the outer wall of the annular sleeve 231 and the inner cavity of the cold shrink cable terminal, thereby significantly reducing the friction resistance between the two, and avoiding defects such as material tearing, deformation or surface damage caused by pulling during the demoulding process; secondly, the radial contraction of the annular sleeve 231 can form a certain gap compensation effect, so that an initial separation trend is generated between the inner wall of the cable terminal and the core rod after molding, further improving the stability and consistency of the initial stage of demoulding, and improving the overall production efficiency and product qualification rate.

[0051] Moreover, since the annular sleeve 231 has a conical structure, the necessary deformation space can be provided for the radial retraction of the annular sleeve 231 during the axial backward movement of the support column 233. In addition, a certain gap is reserved between the support bar 232 and the support column 233 to accommodate the relative displacement during the retraction process. It should be noted that the annular sleeve 231 can be made of high-strength elastic metal materials, such as spring steel or stainless steel alloy, which has good mechanical strength and elastic deformation ability. It can achieve controllable retraction during the demolding stage, and maintain structural stability and dimensional accuracy during the injection molding process. At the same time, it has excellent high-temperature resistance and can adapt to the injection environment of high-temperature molten plastic.

[0052] See also Figure 2-Figure 7In order to enable the core rod structure 23 to move synchronously with the movable template 21 to the predetermined molding position, the core rod structure 23 is set on the front side of the movable plate 236. The fixed template 22 and the movable template 21 are both provided with a fixing groove 237 for accommodating and positioning the movable plate 236. When the movable template 21 is closed, the movable plate 236 can be stably embedded between the upper and lower fixing grooves 237, thereby realizing the precise positioning of the core rod structure 23 in the closed state of the mold. The bottom wall of the fixing groove 237 is installed with a fixing column 236 that slides up and down with the movable plate 236 and the movable template 21. 38. Support springs 239 are provided on the upper and lower sides of the movable plate 236 and are sleeved on the outside of the fixed column 238. One end of the support spring 239 abuts against the bottom wall of the fixed groove 237, and the other end abuts against the movable plate 236, which is used to provide an upward elastic supporting force to buffer the pressure on the core rod structure 23 during the injection molding process and ensure that it can be quickly reset when the mold is opened. A guide column 240 is also installed on the upper end of the fixed template 22, which is matched with the movable template 21 to slide up and down. The guide column 240 can provide reliable and stable guidance and structural support for the movement of the movable template 21.

[0053] When the movable plate 21 moves downward along the fixed column 238 and the guide column 240 and gradually approaches the fixed plate 22, it first pushes the movable plate 236 to move downward synchronously along the fixed column 238 through the support spring 239 located on the upper side of the movable plate 236. At the same time, the support spring 239 located on the lower side of the movable plate 236 is also compressed. As the movable plate 21 continues to descend until it is completely in contact with the fixed plate 22, the movable plate 236 drives the core rod structure 23 to move accurately to the required molding position. At this time, the movable plate 236 is embedded in the two fixed grooves 237 between the fixed plate 22 and the movable plate 21, and the movable plate 236 is inserted into the two fixed grooves 237 between the fixed plate 22 and the movable plate 21. The support springs 239 on the upper and lower sides are in a pre-compression state, providing a reset driving force for the subsequent mold opening action; when the mold assembly 2 enters the mold opening stage, the movable template 21 can be reset upward along the fixed column 238 and the guide column 240. As the movable template 21 moves upward, the compression force applied to the support spring 239 above the movable plate 236 is gradually released, and the movable plate 236 moves upward under the elastic force of the support spring 239 below, thereby achieving synchronous separation from the movable template 21 and the fixed template 22. The core rod structure 23 is reset with the movable plate 236 and separates from the cavity 211 on the movable template 21 and the fixed template 22.

[0054] See also Figure 4 、 Figure 7 、 Figure 9 、 Figure 10 and Figure 13In order to realize the spiral rotation movement while the core rod structure 23 performs the retraction action, the insertion rod 235 is installed on the rear side of the connecting plate 241. The connecting plate 241 is fixedly connected to the support column 233 through the arc support plate 242, so that the connecting plate 241 can drive the insertion rod 235, the arc support plate 242 and the support column 233 to move synchronously, and the arc support plate 242 will not interfere with the sliding path of the support column 233 along the support bar 232 and the annular sleeve 231. The rear end of the support column 233 is equipped with a rotating column 243 that is movable through the movable plate 236. The rotating column 243 can slide and rotate inside the movable plate 236. A spiral groove 244 is provided on the rotating column 243, and a The protrusion 245 slides in cooperation with the spiral groove 244. When the rotating column 243 moves backward with the support column 233, the spiral groove 244 on it contacts the protrusion 245 on the movable plate 236 and generates a lateral component of force, pushing the rotating column 243 to rotate while moving axially. The rotational motion is transmitted to the support bar 232 and the annular sleeve 231 through the support column 233, driving them to rotate spirally synchronously. The spiral rotation action of the core rod structure 23 can further destroy the vacuum adsorption effect and friction locking phenomenon that may exist between the cold shrink cable terminal and the annular sleeve 231, ensuring that subsequent products can be smoothly and evenly separated from the core rod structure 23, reducing the possibility of surface scratches and defects.

[0055] See also Figure 3 、 Figure 4 and Figure 9 In order to make the rotating column 243 move backward along the movable plate 236, a wedge block 1 246 is installed after the rotating column 243 passes through the movable plate 236. A sliding groove 247 is provided on the inclined surface of the wedge block 1 246. A wedge block 248 is slidingly provided on the inclined surface of the wedge block 1 246. The inclined surface of the wedge block 248 slides with the sliding groove 247 through a slider 249 to form a stable sliding fit structure. A connecting frame 250 connected to the movable template 21 is installed on the upper end of the wedge block 248. When the movable template 21 approaches or moves away from the fixed template 22, the connecting frame 250 always moves synchronously with the movable template 21 and drives The wedge block 248 moves together, and at the same time, the movable plate 236 can drive the rotating column 243 and the wedge block 1 246 connected thereto to move synchronously, so that the wedge block 1 246 and the wedge block 2 248 always maintain a coordinated state during the whole process, and the relative position remains unchanged. When the movable template 21 completes the mold closing and starts to move up and reset, it continues to move upward for a distance, and the wedge block 248 rises accordingly through the connecting frame 250, and drives the wedge block 1 246 to move backward with the cooperation of the slider 249 and the slide groove 247, thereby driving the rotating shaft to move backward along the movable plate 236, and finally realizing the inward retraction and rotation compound action of the core rod structure 23.

[0056] See also Figure 3 and Figure 9, elastic telescopic rods 251 are also provided on both sides of the left and right sides of the wedge block 1 246, and the telescopic ends of the elastic telescopic rods 251 are rollingly installed with rolling balls 252. The left and right sides of the wedge block 1 246 are provided with evenly distributed circular grooves 253, and the rolling balls 252 roll in cooperation with the circular grooves 253. The elastic telescopic rods 251 are fixedly connected to the connecting frame 250 through the support frame 254. When the movable template 21 drives the connecting frame 250 and the wedge block 248 to reset upward, the elastic telescopic rods 251 are synchronously moved upward through the support frame 254. Since the wedge block 248 moves backward during this process, the elastic telescopic rods 251 The balls 252 at the end roll into and out of the circular grooves 253 on the wedge block 248 in turn, achieving repeated engagement and separation, and the elastic telescopic rod 251 continuously expands and contracts with the movement of the balls 252. During this process, the balls 252, driven by the elastic telescopic rod 251, produce a periodic tapping effect on the surface of the wedge block 1 246, and transmit the slight vibration to the wedge block 1 246 itself. Because the wedge block 1 246 is fixedly connected to the rotating column 243, the vibration can be further transmitted to the entire core rod structure 23, causing the cold shrink cable terminal attached to the core rod structure 23 to loosen, effectively reducing the friction between it and the core rod structure 23.

[0057] See also Figure 4-Figure 7 In addition, the structure of the cavity 211 on the fixed template 22 and the movable template 21 is the same. Both the fixed template 22 and the movable template 21 are provided with mounting grooves 212 that slide up and down with the corresponding cavity 211. Evenly distributed mounting springs 213 are connected between the cavity 211 and the groove wall of the mounting groove 212. The cavity 211 is elastically mounted in the mounting groove 212 by the mounting spring 213. In the initial state, the cavity 211 partially extends out of the mounting groove 212 under the action of the mounting spring 213. When the movable template 21 moves downward and closes with the fixed template 22, the cavity 211 on the fixed template 22 is squeezed by the cavity 211 of the movable template 21, compressing the mounting spring 213 and completely embedding it in the mounting groove 212, so that the upper and lower cavities 211 are precisely docked to form a complete The mold cavity space is used to accurately form cold-shrink cable terminal products; when the mold is opened, the movable mold plate 21 moves away from the fixed mold plate 22. At this time, the cavity 211 on one side of the movable mold plate 21 is reset downward under the rebound action of the installed spring 213, and the cavity 211 on the fixed mold plate 22 is also reset upward under the action of the installed spring 213. The upper and lower cavities 211 tend to move toward each other. This movement process provides a certain inertial thrust for the product during the synchronous separation of the formed cold-shrink cable terminal product driven by the core rod structure 23, so that it is relatively separated from the surface of the cavity 211, effectively reducing the friction resistance between the two. At the same time, this structural design can prevent defects such as strain and deformation caused by adhesion or jamming when the product is opened, and significantly improves the surface finish and overall molding quality of the product.

[0058] See also Figure 5 and Figure 6 At the same time, positioning plates 214 are installed at the four corners of the cavity 211. The positioning plates 214 slide up and down with the corresponding fixed template 22 or movable template 21. Among them, a positioning hole 215 is opened on the positioning plate 214 at the bottom, and a positioning rod matching the positioning hole 215 is installed on the positioning plate 214 at the top. When the movable template 21 moves downward and approaches the fixed template 22 and the upper and lower cavities 211 are about to contact, the positioning rod is first inserted into the positioning hole 215 to achieve preliminary alignment and guidance between the upper and lower cavities 211. This pre-positioning structure plays a key guiding role in the mold closing process, ensuring that the upper and lower cavities 211 are accurately docked, avoiding product molding deviations or flash defects caused by misalignment.

[0059] See also Figure 7 and Figure 8 In addition, an arc-shaped groove 216 is provided on the fixed template 22 and the movable template 21, and the support column 233 and the arc support plate 242 can be embedded in the corresponding arc-shaped groove 216. A semi-annular plate 217 that cooperates with the end of the annular sleeve 231 is provided inside the arc-shaped groove 216, which is used to close the end of the cavity 211 during the molding process to ensure the complete molding of the cold-shrink cable terminal end structure. A rectangular groove 218 that slides with the semi-annular plate 217 is provided on the bottom wall of the arc-shaped groove 216. A reset spring 219 connected to the semi-annular plate 217 is installed in the rectangular groove 218. Initially, the semi-annular plate 217 is in a position away from the cavity 211 under the action of the reset spring 219.

[0060] See also Figure 7-Figure 9 In order to enable the semi-annular plate 217 to be close to the cavity 211 and achieve end sealing when the mold assembly 2 is closed, an arc-shaped push plate 220 is installed on the side of the semi-annular plate 217 away from the cavity 211. The arc-shaped push plate 220 is inclined outward on the side away from the semi-annular plate 217, and the corresponding support column 233 and the arc-shaped support plate 242 are sleeved with a pressure ring 221 on the outside. The side of the pressure ring 221 close to the annular sleeve 231 is axially retracted to form an inclined surface structure matching the inclined surface of the corresponding arc-shaped push plate 220, wherein the pressure ring 221 located on the rear side is rotatably connected to the movable plate 236 to support the rotation of the annular sleeve 231, and a connecting block is connected between the pressure ring 221 and the annular sleeve 231, and an avoidance groove for avoiding the connecting block is opened on the semi-annular plate 217.

[0061] When the core rod structure 23 moves downward with the movable template 21 and drives the pressure ring 221 to enter the arc groove 216 on the fixed template 22 or the movable template 21, the inclined end face of the pressure ring 221 gradually contacts the inclined surface of the arc push plate 220 and applies an extrusion force, pushing the arc push plate 220 to slide toward the cavity 211, thereby driving the semi-annular plate 217 to move synchronously, so that it is close to the end of the annular sleeve 231, completing the effective closure of the mold cavity end, and at the same time compressing the return spring 219 set between the semi-annular plate 217 and the rectangular groove 218; during the mold opening process, as the core rod structure 23 moves upward, the pressure ring 221 gradually separates from the contact area of ​​the arc push plate 220. Under the action of the return spring 219, the semi-annular plate 217 quickly retreats to its initial position and separates from the formed cold shrink cable terminal end, effectively preventing the product end from being stuck on the semi-annular plate 217 due to adhesion, causing demolding damage.

[0062] See also Figure 5 and Figure 6 In addition, circular through holes are provided on the left and right sides of the fixed template 22 and the movable template 21, and the circular through holes are connected to the mounting groove 212 for accommodating a knocking rod 222 that can slide along its axial direction. The knocking rod 222 can move back and forth along the circular through hole, thereby realizing periodic impact on the side wall of the cavity 211 in the mounting groove 212. Through the high-frequency alternating impact of the knocking rod 222 in the left and right directions, the cavity 211 is subjected to dynamic excitation forces from both sides, and the vibration energy is effectively transmitted to the cold-shrink cable terminal product that is tightly fitted therewith. In the mold opening stage, the mechanical vibration introduced by the knocking rod 222 can quickly break the adhesion effect between the product and the surface of the cavity 211 due to cooling shrinkage or vacuum adsorption, causing the product to loosen slightly and significantly reducing the demoulding resistance.

[0063] See also Figure 5 and Figure 6 In order to realize the left and right reciprocating movement of the knocking rod 222, a guide groove plate 223 is installed at the end of the knocking rod 222 away from the cavity 211, and a rotating wheel 224 is provided on the rear side of the guide groove plate 223. A control column 225 that slides with the guide groove plate 223 is installed at the eccentric position of the rotating wheel 224. When the rotating wheel 224 rotates, the control column 225 moves along its eccentric trajectory and drives the knocking rod 222 to make periodic reciprocating movements along the axial direction of the through hole through the interaction with the guide groove plate 223. The control column 225 moves behind the knocking rod 222. A rotating shaft 226 is installed at the end, and the rotating shaft 226 is rotatably connected to the mounting frame installed on the fixed template 22 or the movable template 21. A rotating gear 227 is fixedly sleeved on the rotating shaft 226, and the upper and lower corresponding rotating gears 227 are staggered on the left and right. Rack plates 228 are installed on both the fixed template 22 and the movable template 21, wherein the rack plate 228 on the fixed template 22 is meshed with the rotating gear 227 on the movable template 21, and the rack plate 228 on the movable template 21 is meshed with the rotating gear 227 on the fixed template 22.

[0064] During the mold closing process, the movable plate 21 moves downward and drives the rack plate 228 on it to move downward synchronously. At this time, the rotating gear 227 on the movable plate 21 side gradually enters into a meshing state with the rack plate 228 on the fixed plate 22 side; at the same time, the rotating gear 227 on the fixed plate 22 side also gradually meshes with the rack plate 228 of the movable plate 21 as the movable plate 21 approaches. The meshing transmission of the rotating gear 227 and the rack plate 228 can drive the rotating shaft 226 to rotate, thereby driving the rotating wheel 224 to rotate continuously, and finally through the control column 225 and the guide groove plate 223 The linkage relationship between them enables the knocking rod 222 to achieve stable left and right reciprocating motion in the circular through hole; it should be noted that in the mold closing stage, although the knocking rod 222 has started to move, the knocking effect has no substantial impact on the cavity 211 because the injection operation has not yet started; and in the mold separation stage, when the core rod structure 23 drives the molded product away from the cavity 211, the high-frequency knocking of the knocking rod 222 just plays a role, transferring the vibration energy to the product surface, further destroying the residual adhesion, assisting the product to be smoothly separated, and significantly improving the demoulding efficiency and the quality of the finished product.

[0065] On the other hand, the present invention also provides a cold shrink cable accessories molding method, which is applicable to a cold shrink cable accessories molding device, combined with Figure 1 and Figure 2 , including the following steps:

[0066] Step 1: Place the mold assembly 2 in the injection molding machine 1. The hydraulic system in the injection molding machine 1 drives the movable mold plate 21 to move down until it is tightly fitted with the fixed mold plate 22. The clamping unit completes the clamping. At this time, the core rod structure 23 is located between the upper and lower mold cavities 211, forming a mold cavity consistent with the shape and size of the cold-shrink cable terminal to be molded.

[0067] Step 2: Preheat the mold through the heating system to ensure that the mold temperature reaches the set value.

[0068] Step 3: Start the injection unit of the injection molding machine 1 and inject the fully plasticized plastic raw material into the mold cavity formed by the movable mold plate 21 and the fixed mold plate 22 at high pressure and high speed, so that the molten material evenly fills the entire mold cavity 211.

[0069] Step 4: After the injection is completed, the cooling system is immediately started to quickly cool the mold so that the molten material in the mold cavity is quickly cooled and solidified to form the required preliminary shape of the cold shrink cable terminal.

[0070] Step 5: Open the mold assembly 2, and separate the fixed mold plate 22, the core rod structure 23 and the movable mold plate 21 from each other. The core rod structure 23 drives the solidified cold shrink cable terminal away from the fixed mold plate 22. During this process, the core rod structure 23 performs rotational motion and radial inward motion to assist the finished product to smoothly separate from the core rod structure 23.

[0071] Step 6: Use special expansion equipment to moderately expand the formed cold shrink cable terminal and place supports inside it to maintain its expanded state until the supports are removed for actual use.

[0072] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0073] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cold shrink cable accessory forming device, characterized in that: include: Injection molding machine (1); A mold assembly (2), the mold assembly (2) being arranged on an injection molding machine (1), comprising a movable mold plate (21) and a fixed mold plate (22) that cooperate with each other, wherein the movable mold plate (21) and the fixed mold plate (22) are respectively provided with a matching mold cavity (211); A core rod structure (23) is provided between the movable die plate (21) and the fixed die plate (22) and is used to form an internal cavity of the cold shrink cable terminal, comprising a truncated cone-shaped annular sleeve (231) which has a gradually expanding taper from front to back in the axial direction; A support bar (232) is installed on the inner side of the annular sleeve (231). A support column (233) that slides with the support bar (232) is provided inside the annular sleeve (231). An oblique groove (234) is provided inside the support bar (232). An insertion rod (235) is provided inside the oblique groove (234). The insertion rod (235) can move from front to back along the oblique groove (234). During injection molding, the annular sleeve (231), the support bar (232) and the support column (233) cooperate with each other to form a complete core rod shape. During mold separation, as the insertion rod (235) moves backward along the oblique groove (234), the support column (233) synchronously moves relative to the annular sleeve (231) and the support bar (232), thereby allowing the annular sleeve (231) to smoothly achieve radial inward retraction movement.

2. A cold shrink cable accessory forming device according to claim 1, characterized in that: The core rod structure (23) is arranged on the front side of the movable plate (236), the insertion rod (235) is installed on the rear side of the connecting plate (241), the connecting plate (241) is fixedly connected to the support column (233) through the arc-shaped support plate (242), and the rear end of the support column (233) is equipped with a rotating column (243) that movably penetrates the movable plate (236), and the rotating column (243) is provided with a spiral groove (244). The movable plate (236) is internally equipped with a protrusion (245) that slides with the spiral groove (244); The rotating column (243) is installed with a wedge block (246) after passing through the movable plate (236). A sliding groove (247) is provided on the inclined surface of the wedge block (246). A wedge block (248) is slidingly provided on the inclined surface of the wedge block (246). The inclined surface of the wedge block (248) is slidably matched with the sliding groove (247) through a slider (249). The upper end of the wedge block (248) is installed with a connecting frame (250) connected to the movable template (21).

3. The cold shrink cable accessory forming device according to claim 2, characterized in that: The wedge-shaped block (246) is provided with elastic telescopic rods (251) on both left and right sides, and rolling balls (252) are rollingly mounted on the telescopic ends of the elastic telescopic rods (251). The wedge-shaped block (246) is provided with evenly distributed circular grooves (253) on both left and right sides, and the rolling balls (252) and the circular grooves (253) are rollingly engaged. The elastic telescopic rods (251) are fixedly connected to the connecting frame (250) via the supporting frame (254).

4. The cold shrink cable accessory forming device according to claim 2, characterized in that: The fixed plate (22) and the movable plate (21) are both provided with a fixing groove (237) that cooperates with the movable plate (236), and the bottom wall of the fixing groove (237) is installed with a fixing column (238) that cooperates with the movable plate (236) and the movable plate (21) in an upward and downward sliding manner. The upper and lower sides of the movable plate (236) are both provided with support springs (239) that are sleeved on the outside of the fixing column (238). The upper end of the fixed plate (22) is also provided with a guide column (240) that cooperates with the movable plate (21) in an upward and downward sliding manner.

5. The cold shrink cable accessory forming device according to claim 4, characterized in that: The cavities (211) on the fixed template (22) and the movable template (21) have the same structure. Both the fixed template (22) and the movable template (21) are provided with mounting grooves (212) that slide up and down with the corresponding cavities (211). Evenly distributed mounting springs (213) are connected between the cavities (211) and the groove walls of the mounting grooves (212).

6. The cold shrink cable accessory forming device according to claim 4, characterized in that: The fixed plate (22) and the movable plate (21) are both provided with an arc-shaped groove (216), the arc-shaped groove (216) being matched with the corresponding support column (233) and the arc-shaped support plate (242), a semi-annular plate (217) being matched with the end of the annular sleeve (231) being provided inside the arc-shaped groove (216), a rectangular groove (218) being slidably matched with the semi-annular plate (217) being provided on the bottom wall of the arc-shaped groove (216), and a return spring (219) connected to the semi-annular plate (217) being installed in the rectangular groove (218).

7. The cold shrink cable accessory forming device according to claim 6, characterized in that: An arc-shaped push plate (220) is installed on the side of the semi-annular plate (217) away from the cavity (211), and the side of the arc-shaped push plate (220) away from the semi-annular plate (217) is inclined outward, and a pressure ring (221) is sleeved on the outer side of the corresponding support column (233) and the arc-shaped support plate (242), and the side of the pressure ring (221) close to the annular sleeve (231) is axially retracted, wherein the pressure ring (221) located on the rear side is rotatably connected to the movable plate (236), and a connecting block is connected between the pressure ring (221) and the annular sleeve (231), and an avoidance groove for avoiding the connecting block is opened on the semi-annular plate (217).

8. The cold shrink cable accessory forming device according to claim 4, characterized in that: Circular through holes are provided on both the left and right sides of the fixed plate (22) and the movable plate (21), the circular through holes being connected to the mounting grooves (212), and a knocking rod (222) being provided inside the circular through holes, and the knocking rod (222) being capable of reciprocating left and right along the circular through holes.

9. The cold shrink cable accessory forming device according to claim 8, characterized in that: A guide groove plate (223) is installed at one end of the knocking rod (222) away from the cavity (211), a rotating wheel (224) is provided on the rear side of the guide groove plate (223), a control column (225) is installed at an eccentric position of the rotating wheel (224) and is slidably matched with the guide groove plate (223), a rotating shaft (226) is installed at the rear end of the control column (225), a rotating gear (227) is fixedly sleeved on the rotating shaft (226), and the rotating gears (227) corresponding to the upper and lower parts are staggered in the left and right. Rack plates (228) are installed on both the fixed template (22) and the movable template (21), wherein the rack plate (228) on the fixed template (22) is meshed with the rotating gear (227) on the movable template (21), and the rack plate (228) on the movable template (21) is meshed with the rotating gear (227) on the fixed template (22).

10. A method for forming a cold-shrink cable accessory, applicable to the cold-shrink cable accessory forming device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: placing the mold assembly (2) in an injection molding machine (1), wherein the hydraulic system in the injection molding machine (1) drives the movable mold plate (21) to move downward until it is in close contact with the fixed mold plate (22), and the mold clamping unit completes the mold clamping. At this time, the core rod structure (23) is located between the upper and lower mold cavities (211), forming a mold cavity consistent with the shape and size of the cold shrink cable terminal to be molded; Step 2: Preheat the mold through the heating system to ensure that the mold temperature reaches the set value; Step 3: Start the injection unit of the injection molding machine (1) and inject the fully plasticized plastic raw material into the mold cavity formed by the movable mold plate (21) and the fixed mold plate (22) at high pressure and high speed, so that the molten material evenly fills the entire mold cavity (211); Step 4: After the injection is completed, the cooling system is immediately started to quickly cool the mold so that the molten material in the mold cavity is quickly cooled and solidified to form the required preliminary shape of the cold shrink cable terminal; Step 5: Open the mold assembly (2), the fixed mold plate (22), the core rod structure (23) and the movable mold plate (21) are separated from each other, and the core rod structure (23) drives the solidified cold shrink cable terminal away from the fixed mold plate (22). During this process, the core rod structure (23) performs a rotational motion and a radially contracting motion to assist the finished product to smoothly separate from the core rod structure (23); Step 6: Use special expansion equipment to moderately expand the formed cold shrink cable terminal and place supports inside it to maintain its expanded state until the supports are removed for actual use.

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