Forming mold for special-shaped pipe fittings

Abstract

The present invention relates to a forming mold for a special-shaped pipe fitting, and the forming mold includes a fixed mold device, a movable mold device and an injection head assembly. The movable mold device includes a movable mold seat, a movable mold core, an internal thread slider assembly, a first slider assembly and a second slider assembly. The internal thread slider assembly, the first slider assembly and the second slider assembly slide in the forming cavity from different directions to construct the internal space of the special-shaped pipe fitting. The end combination of the forming slider forms a continuous external thread, the first slider assembly and the second slider assembly retract relatively, and the core pulling telescopic part drives the core pulling seat to slide within the core pulling distance range. The forming slider abuts against the slider seat and closes toward the center line to disengage the internal thread of the screw cap part, and the core pulling seat moves to push the slider seat and the core pulling assembly to slide as a whole to move away from the screw cap part. The internal thread slider assembly adopts a telescopic structure to realize internal thread processing, thereby simplifying the overall structure of the mold.

Description

Technical Field

[0001] The invention relates to the technical field of molds, in particular to a forming mold, and more particularly to a forming mold for special-shaped pipe fittings. Background Art

[0002] The special-shaped pipe fitting includes a pipe body, a screw cap, and a conical pipe connecting the pipe body and the screw cap. The pipe body is inclined or vertical relative to the conical pipe, and the outer diameter of the screw cap is greater than the maximum outer diameter of the conical pipe. The outer diameter of the conical pipe gradually decreases from the screw cap to the pipe body, and the screw cap is provided with a continuous internal thread to form a rotation and sealing effect. The pipe body includes a coaxially arranged peripheral pipe and a central pipe, the central pipe is located inside the peripheral pipe, an outer channel is formed between the peripheral pipe and the central pipe, and the central pipe is formed with an inner channel. The conical pipe is provided with two independent channels connected to the outer channel and the inner channel respectively. For example, the special-shaped pipe fitting is provided as a spout of a watering pot.

[0003] When the internal thread of the workpiece is formed by the existing injection mold, a motor is used to drive the gear box to spirally rotate and demould, thereby forming a continuous internal thread on the product. For example, Chinese public document CN116872449A discloses an automatic thread stripping mold, in which the gear box is used to strip the product in the second cavity before demoulding.

[0004] However, setting a spiral demolding structure on the injection mold not only complicates the mold structure and greatly increases the mold cost, but also the spiral demolding process of threaded holes has low demolding efficiency, which greatly affects production efficiency and increases product production costs. Therefore, improvements are needed. Summary of the invention

[0005] In order to overcome the problems existing in the related art, an embodiment of the present invention provides a forming mold for a special-shaped pipe fitting, which is used to solve the technical problems of difficulty in demoulding the full thread of the special-shaped pipe fitting and complex mold structure.

[0006] According to a first aspect of an embodiment of the present invention, a forming mold for a special-shaped pipe fitting is provided, the special-shaped pipe fitting comprising a pipe body, a screw cap, and a tapered pipe connecting the pipe body and the screw cap, the pipe body comprising a coaxially arranged peripheral pipe and a central pipe, the central pipe being located inside the peripheral pipe, the forming mold comprising a fixed mold device and a movable mold device, the fixed mold device being provided with an injection head assembly:

[0007] The movable mold device comprises a movable mold seat, a movable mold core installed on the movable mold seat, an internal thread slider assembly, a first slider assembly and a second slider assembly. The fixed mold device is provided with a fixed mold core. When the fixed mold core and the movable mold core are molded together, a molding cavity is formed. The injection head assembly faces the molding cavity.

[0008] The first slider assembly and the second slider assembly slide relatively in the molding cavity to construct a cavity space corresponding to the tube body portion, and the internal thread slider assembly slides in the molding cavity to construct a cavity space corresponding to the screw cap portion and the cone tube portion; wherein,

[0009] The internal thread slider assembly includes a core-pulling telescopic member, a core-pulling seat connected to the core-pulling telescopic member, a slider seat sliding on the movable mold seat, and a core-pulling assembly movably connected to the core-pulling seat, the core-pulling seat is inserted and slid on the slider seat, and there is a core-pulling distance between the core-pulling seat and the slider seat, the core-pulling assembly includes a core-pulling block fixed to the core-pulling seat and a plurality of forming sliders obliquely sliding along the surface of the core-pulling block, the core-pulling block is a prism structure, and the ends of the plurality of forming sliders are combined to form a continuous external thread;

[0010] After the special-shaped pipe fitting is cooled and formed, the first slider assembly and the second slider assembly retract relatively, the core-pulling telescopic member drives the core-pulling seat to slide within the core-pulling distance range, the forming slider abuts against the slider seat and closes in the center line direction to disengage from the internal thread of the screw cap part, and the core-pulling seat moves to push the slider seat and the core-pulling assembly to slide as a whole to move away from the screw cap part.

[0011] In one embodiment, the core pulling assembly includes at least one core pulling column, the small end of the core pulling block partially protrudes to form a tapered hole core pulling, the core pulling column passes through the tapered hole core pulling, and a guide portion is provided on each prism surface of the core pulling block, and each of the forming slide blocks is slidably fitted on the corresponding prism surface and slidably connected to the guide portion.

[0012] In one embodiment, the forming slider is provided with a sliding portion that matches the guide portion; the forming slider includes a plurality of first lateral sliders and a plurality of second lateral sliders that slide on the core pulling block, the first lateral sliders and the second lateral sliders are alternately distributed, and at least a portion of the first lateral sliders overlap and slide on the surface of the second lateral slider.

[0013] In one embodiment, the second lateral slider includes a first sliding surface, a second sliding surface and a third sliding surface, the sliding portion is configured as a sliding groove recessed from the first sliding surface, the groove wall width of at least part of the sliding groove is greater than the opening width of the sliding groove, the second sliding surface is flush with the adjacent prism surface, and the third sliding surface is flush with the adjacent prism surface, one of the adjacent first lateral sliders is slidably fitted to the second sliding surface, and another adjacent first lateral slider is fitted to the third sliding surface.

[0014] In one embodiment, the first slider assembly is provided with a first molding column, the end of the first molding column is partially protruded to form a first plug-in semi-axis, and the injection head assembly faces the cavity space where the first molding column is located;

[0015] The second slider assembly is provided with a second forming column, the end of the second forming column is partially protruded to form a second plug-in half shaft, and the first plug-in half shaft and the second plug-in half shaft are plugged and complemented to form a columnar structure;

[0016] The second molding column is provided with a center hole and a center column located in the center hole, and the core-pulling column passes through the hole wall of the center hole and abuts against the center column.

[0017] In one embodiment, a forming countersunk hole is disposed at the end of the first forming column, and the central column extends into the forming countersunk hole and is spaced a preset distance from the bottom of the forming countersunk hole.

[0018] In one embodiment, a molding groove is provided at the intersection of the end of the first molding column and the first plug-in half shaft, and a molding notch is provided at the end of the second plug-in half shaft, and the molding groove and the molding notch are combined to form a molding through hole;

[0019] The movable mold core is fixed with a movable pin, and the fixed mold core is fixed with a fixed pin. The movable pin and the fixed pin are coaxially arranged and are respectively inserted along the molding through hole to abut against the two sides of the center column when the mold is closed.

[0020] In one embodiment, at least one protruding positioning boss is provided at the end of the first forming column, the positioning boss and the first plug-in half-shaft are spaced apart, and a positioning groove is provided at the end of the second plug-in half-shaft, and the positioning boss is plug-fitted with the positioning groove.

[0021] In one embodiment, the telescopic sliding direction of the internal thread slider assembly and the telescopic sliding direction of the first slider assembly are obliquely intersected.

[0022] In one embodiment, the fixed mold device is provided with a heating and heat preservation component, and the heating and heat preservation component is arranged around the injection head component.

[0023] The technical solution provided by the embodiment of the present invention may include the following beneficial effects: the internal thread slider assembly, the first slider assembly and the second slider assembly move into the molding cavity from different directions respectively, so that the special-shaped pipe fitting can be internally molded to construct an internal space. The core-pulling telescopic part extends to push the core-pulling assembly to move, so that the end combination of multiple molding sliders forms a continuous external thread. The core-pulling block is a prism structure. When the core-pulling telescopic part retracts, it drives the core-pulling block to retract, and the molding slider abuts against the slider seat to keep the axial position stationary. The radial dimensions of the multiple molding sliders gradually displace and shrink toward the center as the size of the core-pulling block gradually decreases, thereby causing the multiple molding sliders to detach from the internal threaded hole of the screw cap part. Finally, the core-pulling assembly slides away from the screw cap part as the slider seat slides, thereby realizing telescopic processing to form the internal threaded hole and improving molding efficiency. In addition, the internal thread slider assembly adopts a telescopic structure to realize internal thread processing, simplifying the overall structure of the mold.

[0024] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] Figure 1 The figure is a schematic structural diagram of a molding die according to an embodiment.

[0027] Figure 2 The present invention is a schematic structural diagram showing that a fixed mold device in a molding mold is partially hidden according to an embodiment.

[0028] Figure 3 The figure shows an exploded structure of a molding die according to an embodiment.

[0029] Figure 4 The figure is a schematic diagram showing the shape matching of an internal thread slider assembly, a first slider assembly and a second slider assembly according to an embodiment.

[0030] Figure 5 is a schematic diagram showing an internal thread slider assembly according to an embodiment.

[0031] Figure 6 is an exploded schematic diagram showing an internal thread slider assembly according to an embodiment.

[0032] Figure 7 is a schematic diagram showing a first forming column according to an embodiment.

[0033] Figure 8 It is a schematic diagram showing the coordination of the movable pin and the fixed pin of the second molding column according to one embodiment.

[0034] In the figure, the fixed mold device 10; the injection head assembly 11; the fixed pin 12; the fixed mold seat 13; the heating and heat preservation assembly 14; the movable mold device 20; the internal thread slider assembly 21; the core pulling telescopic member 211; the slider seat 212; the molding slider 213; the first lateral slider 2131; the second lateral slider 2132; the first sliding surface 21321; the sliding groove 21322; the second sliding surface 21323; the third sliding surface 21324; the core pulling block 214; the tapered core pulling 2141; the guide part 2142; the guide boss 21421; the prism surface 2143; the core pulling column 215; the core pulling Core seat 216; first slider assembly 22; first molding column 221; first plug-in half shaft 222; molding groove 223; lateral notch 224; positioning boss 225; molding countersunk hole 226; second slider assembly 23; second molding column 231; second plug-in half shaft 2311; center column 2312; positioning groove 2313; molding notch 2314; matching notch 2315; center hole 2316; movable mold core 24; molding cavity 241; movable pin 25; molding through hole 26; movable mold seat 27; special-shaped pipe fitting 30; tube body portion 31; screw cap portion 32; tapered tube portion 33. DETAILED DESCRIPTION

[0035] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0036] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside", etc. appear to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figures 1 to 6 As shown, the present invention provides a forming mold for a special-shaped pipe fitting 30, the special-shaped pipe fitting 30 includes a pipe body 31, a screw cap 32, and a tapered pipe part 33 connecting the pipe body 31 and the screw cap 32, the pipe body 31 includes a coaxially arranged peripheral pipe and a central pipe, and the central pipe is located inside the peripheral pipe. The pipe body 31 is a tubular structure, the screw cap 32 is an annular thin-walled structure, and a continuous thread is arranged on the inner hole wall of the screw cap 32 to form a sealed spiral connection. Optionally, the outer diameter of the screw cap 32 is greater than the maximum outer diameter of the tapered pipe part 33, and the cross-sectional size of the tapered pipe part 33 gradually decreases from the screw cap 32 to the pipe body 31.

[0039] The molding die includes a fixed mold device 10 and a movable mold device 20, which are closed together to be in a mold closing posture or separated to be in a mold opening posture. The fixed mold device 10 is provided with a fixed mold seat 13 and a fixed mold core embedded and fixed in the fixed mold seat 13, and the movable mold device 20 is provided with a movable mold core 24. When the fixed mold core and the movable mold core 24 are closed, a molding cavity 241 is formed. The fixed mold device 10 is provided with an injection head assembly 11, and the injection head assembly 11 faces the molding cavity 241. The injection head assembly 11 is used to inject hot melt fluid into the molding cavity 241.

[0040] The movable mold device 20 includes a movable mold base 27, an internal thread slider assembly 21, a first slider assembly 22 and a second slider assembly 23, and the movable mold core 24 is embedded and installed in the movable mold base 27. The internal thread slider assembly 21, the first slider assembly 22 and the second slider assembly 23 move into the molding cavity 241 from different directions, so that the special-shaped pipe 30 can be internally molded to construct an internal space.

[0041] The movable mold base 27 is rectangular, and three side surfaces of the movable mold base 27 are provided with slide grooves. The telescopic sliding direction of the internal thread slider assembly 21 and the telescopic sliding direction of the first slider assembly 22 are obliquely intersected. Among them, the first slider assembly 22 and the second slider assembly 23 are arranged opposite to each other and can telescopically slide relative to each other along the corresponding slide grooves. The internal thread slider assembly 21 is installed on the third side surface, and the internal thread slider assembly 21, the first slider assembly 22 and the second slider assembly 23 slide into the molding cavity 241 from three directions respectively, so as to match the hole and thread structure of the special-shaped pipe fitting 30 with an intersecting structure.

[0042] The first slider assembly 22 and the second slider assembly 23 slide relatively in the molding cavity 241 to construct a cavity space corresponding to the tube body 31. Preferably, the outer peripheral wall of the tube body 31 is provided with an external thread, and the fixed mold core and the movable mold core 24 are provided with a corresponding thread groove structure in the molding cavity 241 area to directly mold the external thread structure. The internal thread slider assembly 21 slides in the molding cavity 241 to construct a cavity space corresponding to the screw cap part 32 and the tapered tube part 33, as well as the internal thread located at the screw cap part 32.

[0043] The screw cap part 32 needs to be provided with a continuous internal thread. The present invention adopts the linear telescopic drive mode of the internal thread slider assembly 21 to construct the molding and demolding of the internal thread, so as to reduce the complexity of the mold and improve the production efficiency. Among them, the internal thread slider assembly 21 includes a core-pulling telescopic part 211, a core-pulling seat 216 connected to the core-pulling telescopic part 211, a slider seat 212 sliding on the movable mold seat 27, and a core-pulling assembly movably connected to the core-pulling seat 216. The core-pulling seat 216 is inserted and slid on the slider seat 212, and there is a core-pulling distance between the core-pulling seat 216 and the slider seat 212. The core-pulling telescopic part 211 can be set as a telescopic element such as a cylinder or a hydraulic cylinder, and the slider seat 212 is slidably limited in the slide groove to constitute a linear movement. For example, the slide groove is set as a T-slot, a dovetail groove or other structures, and the slider seat 212 is adapted to the slide groove.

[0044] The core pulling assembly includes a core pulling block 214 fixed to a core pulling seat 216 and multiple forming sliders 213 that slide obliquely along the surface of the core pulling block 214. The core pulling block 214 is a prism structure, and the ends of the multiple forming sliders 213 are combined to form a continuous external thread. The cross-sectional size of the core pulling block 214 gradually decreases from the core pulling seat 216 to the end direction. The core pulling block 214 can be set as a quadrangular prism, a hexagonal prism, or an octagonal prism. Preferably, the core pulling block 214 is set as a hexagonal prism, and correspondingly, six forming sliders 213 are set, and each forming slider 213 slides on one of the prism surfaces 2143. Among them, when the core pulling block 214 is retracted by pulling, and the forming slider 213 does not move axially, the forming slider 213 slides relatively from the large end to the small end of the core pulling block 214, and the adjacent two forming sliders 213 are misaligned, thereby reducing the radial dimension distance. Optionally, the thread axial dimension of the screw cap part 32 is set to 10mm-45mm.

[0045] Therefore, after the special-shaped pipe fitting 30 is cooled and formed, the first slider assembly 22 and the second slider assembly 23 retract relatively, and the core pulling telescopic member 211 drives the core pulling seat 216 to slide within the core pulling distance range. The forming slider 213 abuts against the slider seat 212 and closes in the center line direction to disengage from the internal thread of the screw cap part 32. The core pulling seat 216 moves to push the slider seat 212 and the core pulling assembly to slide as a whole to move away from the screw cap part 32.

[0046] like Figures 1 to 6 As shown, the core-pulling telescopic member 211 extends to push the core-pulling assembly to move, so that the end combination of the multi-piece forming slider 213 forms a continuous external thread. The core-pulling block 214 is a prism structure. When the core-pulling telescopic member 211 retracts, it drives the core-pulling block 214 to retract, and the forming slider 213 abuts against the slider seat 212 to keep the axial position immobile. The radial dimensions of the multi-piece forming sliders 213 gradually shift and shrink toward the center as the size of the core-pulling block 214 gradually decreases, thereby causing the multi-piece forming sliders 213 to detach from the internal thread hole of the rotary cover part 32. Finally, the core-pulling assembly slides away from the rotary cover part 32 as the slider seat 212 slides, thereby realizing telescopic processing to form the internal thread hole and improving the molding efficiency. In addition, the internal thread slider assembly 21 adopts a telescopic structure to realize internal thread processing, simplifying the overall structure of the mold.

[0047] In one embodiment, the core pulling assembly includes at least one core pulling column 215, and the small end of the core pulling block 214 partially protrudes to form a tapered core pulling 2141, and the core pulling column 215 passes through the tapered core pulling 2141. The core pulling column 215 passes through the tapered core pulling 2141, and the tapered core pulling 2141 and the core pulling column 215 jointly construct the inner space and channel shape of the tapered tube portion 33. Among them, the core pulling column 215 can be inserted into the tube body portion 31 to connect the space of the screw cover portion 32 with the space of the tube body portion 31.

[0048] A guide portion 2142 is provided on each prism surface 2143 of the core pulling block 214, and a sliding portion matching the guide portion 2142 is provided on the forming slider 213. Each forming slider 213 slides and fits the corresponding prism surface 2143 and is slidably connected with the guide portion 2142. The core pulling telescopic member 211 drives the core pulling seat 216 to slide, and the core pulling seat 216 and the core pulling block 214 move the core pulling distance into the slider seat 212, and the guide portion 2142 drives the forming slider 213 to shrink toward the center of the core pulling block 214 until the core pulling seat 216 pushes the slider seat 212 to slide. The guide portion 2142 can be set as a guide boss 21421, and the sliding portion on the forming slider 213 is set as a sliding groove 21322 to cooperate with the sliding limitation. For example, the guide portion 2142 is set as a dovetail groove, a T-shaped groove or other guide boss 21421 structure with a limit.

[0049] The core-pulling block 214 limits the forming slider 213, and also enables the forming slider 213 to always slide in close contact with the prism surface 2143, and the sliding track and sliding stroke are controllable. The core-pulling block 214 slides and drives the forming slider 213 to converge toward the center through the guide portion 2142, so that the outer diameter of the external thread portion formed by the forming slider 213 is reduced and partially dislocated, and the thread portion of the screw cap portion 32 is separated, so that it can move linearly and separate.

[0050] In an optional embodiment, the forming slider 213 includes a plurality of first lateral sliders 2131 and a plurality of second lateral sliders 2132 sliding on the core pulling block 214, the first lateral sliders 2131 and the second lateral sliders 2132 are alternately distributed, and at least part of the first lateral sliders 2131 overlap and slide on the surface of the second lateral slider 2132. The forming slider 213 adopts a different structure, wherein the area of ​​the first lateral slider 2131 is larger than the area of ​​the second lateral slider 2132, and the first lateral slider 2131 slides and fits the second lateral slider 2132 to further improve the fit of adjacent forming sliders 213. Preferably, the core pulling block 214 is a hexagonal pyramid structure, wherein the core pulling block 214 includes three large inclined surfaces and three small inclined surfaces, and the large inclined surfaces and the small inclined surfaces are alternately distributed. The area of ​​the large slope is larger than that of the small slope, wherein the first lateral slider 2131 is slidably connected to the small slope, and the second lateral slider 2132 is slidably connected to the large slope, and both sides of the first lateral slider 2131 extend toward the two adjacent second lateral sliders 2132 respectively, and slidably cooperate with the second lateral slider 2132 to form the continuity of the external thread.

[0051] Specifically, the second lateral slider 2132 includes a first sliding surface 21321, a second sliding surface 21323 and a third sliding surface 21324, and the sliding portion is configured as a sliding groove 21322 recessed from the first sliding surface 21321, and the groove wall width of at least part of the sliding groove 21322 is greater than the opening width of the sliding groove 21322. The second sliding surface 21323 is flush with the adjacent prism surface 2143, and the third sliding surface 21324 is flush with the adjacent prism surface 2143, wherein one adjacent first lateral slider 2131 is slidably fitted to the second sliding surface 21323, and another adjacent first lateral slider 2131 is fitted to the third sliding surface 21324. In the mold closing posture, all the molding sliders 213 slide into place and form a continuous external thread structure in the molding cavity 241. The multiple molding sliders 213 are combined and cooperated and can slide relative to each other, so that when the core pulling block 214 is axially pulled within the core pulling distance, all the molding sliders 213 only have the radial size reduced, while the axial size remains unchanged.

[0052] Preferably, all the forming sliders 213 are combined to form an annular structure, and a flange ring is formed on the forming slider 213. A core-pulling slideway is provided in the slider seat 212, and the forming slider 213 passes through the slider seat 212 and the flange ring is located in the core-pulling slideway. The flange ring can limit the forming slider 213 to slide in the radial direction while the axial position remains unchanged. The slider seat 212 can be composed of two parts.

[0053] like Figures 2 to 8As shown, the first slider assembly 22 and the second slider assembly 23 jointly construct the internal shape of the tube body 31, so as to realize the channel construction of the special-shaped pipe fitting 30 by moving and plugging in a columnar or tubular structure.

[0054] The first slider assembly 22 is provided with a first molding column 221, and the end of the first molding column 221 partially protrudes to form a first plug-in semi-axis 222, and the injection head assembly 11 faces the cavity space where the first molding column 221 is located. The second slider assembly 23 is provided with a second molding column 231, and the end of the second molding column 231 partially protrudes to form a second plug-in semi-axis 2311, and the first plug-in semi-axis 222 and the second plug-in semi-axis 2311 are plugged and complemented to form a columnar structure.

[0055] The first forming column 221 and the second forming column 231 are arranged opposite to each other to respectively form the two ends of the tube body 31. The first plug-in half shaft 222 and the second plug-in half shaft 2311 cooperate with each other to form a cylindrical structure, and a hollow or thin-walled structure can be formed between the first plug-in half shaft 222 and the second plug-in half shaft 2311, thereby realizing flexible shaping of the tube body 31.

[0056] Further, the second forming column 231 is provided with a center hole 2316 and a center column 2312 located in the center hole 2316, and the core-pulling column 215 passes through the hole wall of the center hole 2316 and abuts against the center column 2312. The center hole 2316 runs through the second forming column 231, and the center column 2312 shuttles along the center line of the center hole 2316. The second forming column 231 is provided with a channel hole, and the core-pulling column 215 passes through the channel hole and abuts against the center column 2312, wherein the aperture of the channel hole is larger than the diameter of the core-pulling column 215. Correspondingly, the tube body portion 31 is formed with a center channel and an outer tube body surrounding the center channel, and the core-pulling column 215 forms a lateral hole connected to the center channel. Further, another core-pulling column 215 can form a channel connected to the outer tube body.

[0057] In one embodiment, a forming countersunk hole 226 is provided at the end of the first forming column 221, and the center column 2312 extends into the forming countersunk hole 226 and is spaced a preset distance from the bottom of the forming countersunk hole 226. The forming countersunk hole 226 is recessed from the end of the first forming column 221, and the recess extends from the first plug-in half shaft 222 into the first forming column 221 to form a countersunk hole structure. The center column 2312 is inserted into the forming countersunk hole 226, and accordingly, the center hole 2316 forms a countersunk hole structure in this area, and the outer tube body is a tubular structure, and the inner recess of the tube body portion 31 is flexibly formed.

[0058] The first plug-in half shaft 222 and the second plug-in half shaft 2311 are combined with each other to form a pipeline structure, wherein at least one protruding positioning boss 225 is provided at the end of the first molding column 221, and the positioning boss 225 and the first plug-in half shaft 222 are arranged at intervals, and a positioning groove 2313 is provided at the end of the second plug-in half shaft 2311, and the positioning boss 225 is plugged and matched with the positioning groove 2313. The positioning groove 2313 of the second plug-in half shaft 2311 is plugged and matched with the first molding column 221 to form plug-in positioning and prevent the hot-melt material from impacting the second plug-in half shaft 2311 and causing distortion. The positioning boss 225 is located at the end face where the first plug-in half shaft 222 protrudes, and the positioning boss 225 is spaced apart from the first plug-in half shaft 222. The positioning boss 225 is plug-connected with the second plug-in half shaft 2311. Preferably, two positioning bosses 225 are arranged at intervals. Based on the same principle, the end of the first plug-in half shaft 222 is plugged into the convex end face of the second plug-in half shaft 2311 to form an interlocking structure. The first plug-in half shaft 222 and the second plug-in half shaft 2311 are combined to form a pipeline structure that can withstand radial fluid filling pressure without displacement.

[0059] Furthermore, a molding groove 223 is provided at the intersection of the end of the first molding column 221 and the first plug-in half shaft 222 , and a molding notch 2314 is provided at the end of the second plug-in half shaft 2311 . The molding groove 223 and the molding notch 2314 are combined to form a molding through hole 26 .

[0060] The movable mold core 24 is fixed with a movable pin 25, and the fixed mold core is fixed with a fixed pin 12. The movable pin 25 and the fixed pin 12 are coaxially arranged and are respectively inserted and abutted against the two sides of the center column 2312 when the mold is closed. The outline size of the molding through hole 26 is larger than the outline size of the movable pin 25 and the fixed pin 12, so that the fluid injected by the injection head assembly 11 can enter the molding counterbore 226 and the center hole 2316 along the molding through hole 26, thereby constructing a fluid circulation pipeline inside the tube body 31.

[0061] Preferably, the injection direction of the injection head assembly 11 is perpendicular to the first molding column 221 and close to the molding through hole 26, wherein the first molding column 221 has high structural strength and stability, and can offset the injection pressure of the fluid injection. Furthermore, the movable pin 25 and the fixed pin 12 are respectively abutted against the two sides of the center column 2312 to provide support for the center column 2312. It is worth mentioning that the center column 2312 is a long-axis cantilever structure, one end of which is fixedly arranged, and the other end is supported by the movable pin 25 and the fixed pin 12. The injection direction of the fluid from the molding through hole 26 is parallel to the fixed pin 12 to keep the position of the center column 2312 unchanged, and a stable slender hole channel structure can be formed. In addition, the molding through hole 26 is located in the column structure part of the first molding column 221 and the second molding column 231, and the overall impact resistance is high. Combined with the plug-in positioning of the end of the first plug-in half shaft 222 and the second plug-in half shaft 2311, the structural stability is high.

[0062] Further preferably, a lateral notch 224 is provided at the end of the first plug-in half shaft 222, and a matching notch 2315 is formed at the end of the tube wall of the second molding column 231. The lateral notch 224 and the matching notch 2315 are combined to form a channel hole for the core-pulling column 215 to pass through, which can not only reduce the opening amount of the second molding column 231, but also provide a more flexible control method for the plug-in sliding of the first molding column 221 and the second molding column 231.

[0063] like Figures 1 to 3 As shown, in order to improve the injection molding effect of the injection head assembly 11, the fixed mold device 10 is provided with a heating and heat preservation assembly 14, and the heating and heat preservation assembly 14 is arranged around the injection head assembly 11. The heating and heat preservation assembly 14 includes a mounting block and a heating element, and the heating element is used to heat the heat preservation mounting block. The injection head assembly 11 is inserted and installed in the mounting block to form a fixed installation and receive the transfer of ambient temperature. Preferably, temperature detection elements are provided at both ends of the injection head assembly 11, which are used to detect the temperature at both ends of the mounting block to control the heating temperature of the heating element.

[0064] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0065] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A forming mold for a special-shaped pipe fitting, the special-shaped pipe fitting comprising a pipe body, a screw cap, and a tapered pipe connecting the pipe body and the screw cap, the pipe body comprising a coaxially arranged peripheral pipe and a central pipe, the central pipe being located inside the peripheral pipe, the forming mold comprising a fixed mold device and a movable mold device, the fixed mold device being provided with an injection head assembly, characterized in that: The movable mold device comprises a movable mold seat, a movable mold core installed on the movable mold seat, an internal thread slider assembly, a first slider assembly and a second slider assembly. The fixed mold device is provided with a fixed mold core. When the fixed mold core and the movable mold core are molded together, a molding cavity is formed. The injection head assembly faces the molding cavity. The first slider assembly and the second slider assembly slide relatively in the molding cavity to construct a cavity space corresponding to the tube body portion, and the internal thread slider assembly slides in the molding cavity to construct a cavity space corresponding to the screw cap portion and the cone tube portion; wherein, The internal thread slider assembly includes a core-pulling telescopic member, a core-pulling seat connected to the core-pulling telescopic member, a slider seat sliding on the movable mold seat, and a core-pulling assembly movably connected to the core-pulling seat, the core-pulling seat is inserted and slid on the slider seat, and there is a core-pulling distance between the core-pulling seat and the slider seat, the core-pulling assembly includes a core-pulling block fixed to the core-pulling seat and a plurality of forming sliders obliquely sliding along the surface of the core-pulling block, the core-pulling block is a prism structure, and the ends of the plurality of forming sliders are combined to form a continuous external thread; After the special-shaped pipe is cooled and formed, the first slider assembly and the second slider assembly are relatively retracted, the core-pulling telescopic member drives the core-pulling seat to slide within the core-pulling distance range, the forming slider abuts against the slider seat and closes in the center line direction to disengage from the internal thread of the screw cap part, and the core-pulling seat moves to push the slider seat and the core-pulling assembly to slide as a whole to move away from the screw cap part; The core pulling assembly includes at least one core pulling column, the small end of the core pulling block partially protrudes to form a tapered hole core pulling, the core pulling column passes through the tapered hole core pulling, and a guide portion is provided on each prism surface of the core pulling block, and each of the forming sliders is slidably fitted to the corresponding prism surface and slidably connected to the guide portion; The first slider assembly is provided with a first molding column, the end of the first molding column is partially protruded to form a first plug-in semi-axis, and the injection head assembly faces the cavity space where the first molding column is located; The second slider assembly is provided with a second forming column, the end of the second forming column is partially protruded to form a second plug-in half shaft, and the first plug-in half shaft and the second plug-in half shaft are plugged and complemented to form a columnar structure; The second molding column is provided with a center hole and a center column located in the center hole, and the core-pulling column passes through the hole wall of the center hole and abuts against the center column; A molding groove is provided at the intersection of the end of the first molding column and the first plug-in half shaft, and a molding notch is provided at the end of the second plug-in half shaft, and the molding groove and the molding notch are combined to form a molding through hole; The movable mold core is fixed with a movable pin, and the fixed mold core is fixed with a fixed pin. The movable pin and the fixed pin are coaxially arranged and are respectively inserted along the molding through hole to abut against two sides of the center column when the mold is closed; A forming countersunk hole is provided at the end of the first forming column, and the central column extends into the forming countersunk hole and is spaced a preset distance from the bottom of the forming countersunk hole; At least one protruding positioning boss is provided at the end of the first forming column, the positioning boss and the first plug-in half-shaft are spaced apart, and a positioning groove is provided at the end of the second plug-in half-shaft, and the positioning boss is plug-fitted with the positioning groove.

2. The forming die for special-shaped pipe fittings according to claim 1, characterized in that: The forming slider is provided with a sliding portion that matches the guide portion; the forming slider includes a plurality of first lateral sliders and a plurality of second lateral sliders that slide on the core pulling block, the first lateral sliders and the second lateral sliders are alternately distributed, and at least part of the first lateral sliders overlap and slide on the surface of the second lateral slider.

3. The forming die for the special-shaped pipe fitting according to claim 2, characterized in that: The second lateral slider includes a first sliding surface, a second sliding surface and a third sliding surface, the sliding portion is configured as a sliding groove recessed from the first sliding surface, the groove wall width of at least part of the sliding groove is greater than the opening width of the sliding groove, the second sliding surface is flush with the adjacent prism surface, and the third sliding surface is flush with the adjacent prism surface, one of the adjacent first lateral sliders is slidably fitted to the second sliding surface, and another adjacent first lateral slider is fitted to the third sliding surface.

4. The forming die for the special-shaped pipe fitting according to claim 1, characterized in that: The telescopic sliding direction of the internal thread slider assembly and the telescopic sliding direction of the first slider assembly are obliquely intersected.

5. The forming die for the special-shaped pipe fitting according to claim 1, characterized in that: The fixed mold device is provided with a heating and heat preservation component, and the heating and heat preservation component is arranged around the injection head component.

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