An eccentric tee joint die for pipe

Abstract

The utility model discloses a kind of eccentric three-way die for pipe, including lower mould and upper mould, lower mould is provided with first pair of slot, core rod assembly and ejector pin position cavity, core rod assembly can be movably set in first pair of slot, core rod assembly includes first core rod and second core rod, second core rod is eccentric to first core rod, and ejector pin position cavity is connected with first pair of slot respectively;Upper mould is provided with second pair of slot and main runner, and main runner is communicated with second pair of slot, and second pair of slot, first pair of slot and core rod assembly can be matched to form cavity.The utility model can improve the stripping efficiency of eccentric three-way, and improve the injection molding qualification rate of eccentric three-way.

Description

Technical Field

[0001] This utility model relates to the field of pipe mold production technology, and in particular to an eccentric tee mold for pipes. Background Technology

[0002] An eccentric tee is a special type of pipe fitting. Its core feature is that the axis of its branch pipe does not intersect with the axis of the main pipe, but rather there is a specific offset distance. The branch pipe and main pipe of an eccentric tee can connect different pipes, enabling the connection of pipes in different locations and directions. The design of the eccentric tee reduces the risk of rubbing when cables and other materials are bundled or joined, improving the ease of pipe installation. Currently, eccentric tees are generally manufactured using injection molding. Due to the irregular structure of the eccentric tee, it is difficult to detach from the mold after injection molding, which can easily lead to mold jamming or even damage, affecting the finished product yield and resulting in low production efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an eccentric tee mold for pipes, which improves the demolding efficiency of eccentric tees and increases the injection molding pass rate of eccentric tees.

[0004] An eccentric tee mold for pipes according to an embodiment of the present invention includes: The lower mold is provided with a first mating groove, a mandrel assembly and an ejector pin cavity. The mandrel assembly is movably disposed in the first mating groove. The mandrel assembly includes a first mandrel and a second mandrel. The second mandrel is eccentrically disposed relative to the first mandrel. The ejector pin cavity is connected to the first mating groove. The upper mold is provided with a second pair of mating grooves and a main channel. The main channel is connected to the second pair of mating grooves. The second pair of mating grooves, the first pair of mating grooves, and the mandrel assembly can be matched to form a cavity.

[0005] An eccentric tee mold for pipes according to an embodiment of the present utility model has at least the following beneficial effects: After the lower mold base and upper mold base are matched, positioned, and locked, the second mating groove is matched and connected with the first mating groove. Then, the first mandrel and the second mandrel, which are perpendicular to each other, are matched and connected to form a T-shaped mandrel assembly. At this time, the mandrel assembly matches with the second and first mating grooves to form a cavity. During injection molding, the molten plastic flows into the cavity through the main runner. The molten plastic can also flow into the ejector pin cavity. After the pressure holding and cooling process, the molten plastic in the ejector pin cavity can form multiple ejector pin gates. The molten plastic inside the cavity can form an eccentric tee after the pressure holding and cooling process. After injection molding, ejector pins, push blocks, and other devices are used to apply an upward pushing force to the multiple ejector pin gates below the ejector pin cavity, which can lift up the eccentric tee together, realizing the demolding of the eccentric tee. This invention can improve the demolding efficiency of eccentric tees and is less likely to cause eccentric tees to jam, thereby reducing the probability of damage to finished eccentric tees, improving the injection molding pass rate of eccentric tees, and increasing the production efficiency of eccentric tees.

[0006] According to an embodiment of the present invention, an eccentric tee mold for pipes includes a first ejector groove and a second ejector groove in the ejector cavity, wherein the first ejector groove and the second ejector groove are connected to each other on both sides of a first mating groove.

[0007] According to an embodiment of the present invention, an eccentric tee mold for pipes includes a third ejector groove in the ejector cavity, wherein the third ejector groove and the second ejector groove are spaced apart and disposed on the same side of the first mating groove.

[0008] According to an embodiment of the present invention, an eccentric tee mold for pipes includes a fourth ejector slot in the ejector cavity. The fourth ejector slot is connected to the first mating slot and is disposed opposite to the first ejector slot on both sides of the first mating slot. The fourth ejector slot is also disposed opposite to the second ejector slot on both sides of the first mating slot.

[0009] According to an embodiment of the present invention, an eccentric tee mold for pipes includes a lower mold further comprising an ejector mechanism, which is matched with the ejector cavity.

[0010] According to an embodiment of the present invention, an eccentric tee mold for pipes is provided with a matching mechanism between a first mandrel and a second mandrel, and the first mandrel and the second mandrel can be matched and connected through the matching mechanism.

[0011] According to an embodiment of the present invention, an eccentric tee mold for pipes includes a matching mechanism comprising a first positioning groove disposed on the periphery of a first mandrel and a positioning protrusion disposed on a second mandrel near the end of the first mandrel, wherein the first positioning groove and the positioning protrusion are matchable and connected.

[0012] According to an embodiment of the present invention, an eccentric tee mold for pipes includes a mandrel assembly that further includes a third mandrel. The third mandrel is coaxially arranged opposite to the first mandrel, and the first mandrel, the second mandrel, and the third mandrel can be matched and connected.

[0013] According to an embodiment of the present invention, an eccentric tee mold for pipes includes a matching mechanism that further includes a second positioning groove disposed on the periphery of a third mandrel, wherein the second positioning groove and the positioning protrusion are matched and connected.

[0014] According to an embodiment of the present invention, an eccentric tee mold for pipes is provided in a lower mold, which is further provided with a first groove, a second groove and a third groove. A first mandrel is slidably connected to the first groove, a second mandrel is slidably connected to the second groove, and a third mandrel is slidably connected to the third groove.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the lower mold structure of an eccentric tee mold for pipes according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the lower mold in the separated state of the mandrel assembly of an eccentric tee mold for pipes according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the upper mold of an eccentric tee mold for pipes according to an embodiment of the present utility model; Figure 4 This is a side view of the internal structure of an eccentric tee mold for pipes according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: Lower mold 100; Lower mold base 110; First mating groove 111; Third mating groove 112; First sliding groove 113; Second sliding groove 114; Third sliding groove 115; First mandrel 120; First positioning groove 121; Second mandrel 130; Positioning protrusion 131; Third mandrel 140; Second positioning groove 141; First ejector pin slot 150; Second ejector pin slot 160; Third ejector pin slot 170; Fourth ejector pin slot 180; Ejector pin mechanism 190; Connecting frame 191; Ejector pin part 192; Drive cylinder 193; Upper mold 200; Upper mold base 210; Second pair of mating grooves 220; Fourth pair of mating grooves 230; Main channel 240; Cavity 300. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figures 1 to 4 This utility model provides an eccentric tee mold for pipes, including a lower mold 100 and an upper mold 200. The lower mold 100 is provided with a first mating groove 111, a mandrel assembly, and an ejector pin cavity. The mandrel assembly is movably disposed within the first mating groove 111. The mandrel assembly includes a first mandrel 120 and a second mandrel 130, with the second mandrel 130 eccentrically disposed relative to the first mandrel 120. The ejector pin cavities are respectively connected to the first mating groove 111. Specifically, the first mating groove 111 has a T-shaped structure. The second mandrel 130 and the first mandrel 120 are not parallel to each other and can move at different positions in the first mating groove 111. Specifically, the first mandrel 120 and the second mandrel 130 are perpendicular to each other and can be matched and connected to form a mandrel assembly with a T-shaped structure.

[0023] The upper mold 200 is provided with a second mating groove 220 and a main channel 240. The main channel 240 is connected to the second mating groove 220. The second mating groove 220, the first mating groove 111 and the mandrel assembly can be matched to form a cavity 300. Specifically, the second mating groove 220 and the first mating groove 111 can be matched and connected. During injection molding, the molten plastic is injected into the cavity 300 through the main channel 240. After pressure holding and cooling processes, an eccentric tee is obtained.

[0024] Specifically, refer to Figure 4 The upper side of the second core rod 130 is horizontally positioned, and the lower side of the second core rod 130 is inclined, as shown in the reference. Figure 4 The dashed line indicates that the second core rod 130 gradually shrinks in the direction close to the first core rod 120, so that the second core rod 130 is eccentrically set relative to the first core rod 120, thereby making one of the tubes of the injection-molded tee tube eccentrically set relative to the other tubes.

[0025] Specifically, during injection molding, after the molten plastic flows into the cavity 300, it flows into the ejector pin cavity. Within the ejector pin cavity, the molten plastic undergoes a holding pressure and cooling process to form multiple ejector pin gates. After injection molding is complete, ejector pins, push blocks, and other devices are used below the ejector pin cavity to apply an upward pushing force to the multiple ejector pin gates, facilitating the lifting of the eccentric tee and achieving demolding.

[0026] Specifically, a locking mechanism is provided between the lower mold base 110 and the upper mold base 210. The locking mechanism can be a combination of bolts and screw holes, a combination of buckles, a pressure plate fixing assembly, etc., as long as it can lock and fix the lower mold base 110 and the upper mold base 210.

[0027] As a preferred option, refer to Figure 1 and Figure 2 , Figure 1 and Figure 2 This is a top view of the structure; the lower mold base 110 is provided with positioning holes; see reference. Figure 3 , Figure 3 The diagram shows a top-down view of the structure. The upper mold base 210 is equipped with a positioning pin to enable rapid positioning between the lower mold base 110 and the upper mold base 210.

[0028] After the lower mold base 110 and the upper mold base 210 are matched and positioned, they are locked and fixed by the locking mechanism. At this time, the second mating groove 220 is matched and connected with the first mating groove 111. Then, the mutually perpendicular first mandrel 120 and the second mandrel 130 are matched and connected to form a T-shaped mandrel assembly. At this time, the mandrel assembly, the second mating groove 220, and the first mating groove 111 match to form a cavity 300. During injection molding, the molten plastic is injected into the cavity 300 through the main runner 240. The molten plastic can also flow into the ejector pin cavity through the cavity 300. After the pressure holding and cooling process, the molten plastic in the ejector pin cavity can form multiple ejector pin gates. After the pressure holding and cooling process, the molten plastic in the cavity 300 can form an eccentric tee. After injection molding, the ejector pins, push blocks and other devices are used to apply an upward pushing force to the multiple ejector pin gates below the ejector pin cavity, which can lift up the eccentric tee together, realizing the demolding of the eccentric tee. This invention can improve the demolding efficiency of eccentric tees, thereby improving the production efficiency of eccentric tees. Moreover, it is less likely to cause eccentric tees to jam, which can reduce the probability of damage to finished eccentric tees and improve the injection molding qualification rate of eccentric tees.

[0029] In some embodiments, the first core rod 120 and the second core rod 130 are not perpendicular to each other, and the first core rod 120 and the second core rod 130 form an angle of less than 90 degrees. In this case, the first mating groove 111 has a tree-like structure.

[0030] According to some embodiments of this application, refer to Figure 1 and Figure 2 The ejector cavity includes a first ejector slot 150 and a second ejector slot 160, which are connected to each other on both sides of the first mating groove 111. The ejector gate formed by the opposing first ejector slot 150 and second ejector slot 160 can balance and distribute the force when it is lifted, thus improving the demolding effect.

[0031] Furthermore, referring to Figure 1 and Figure 2 The ejector cavity also includes a third ejector groove 170, which is spaced apart from the second ejector groove 160 and located on the same side of the first mating groove 111. The ejector nozzle formed by the third ejector groove can further balance and distribute the force.

[0032] Furthermore, referring to Figure 1 and Figure 2The ejector cavity also includes a fourth ejector slot 180, which is connected to the first mating slot 111. The fourth ejector slot 180 and the first ejector slot 150 are disposed opposite each other on both sides of the first mating slot 111. The fourth ejector slot 180 and the second ejector slot 160 are also disposed opposite each other on both sides of the first mating slot 111. The first ejector slot 150, the second ejector slot 160, the third ejector slot 170, and the fourth ejector slot 180 are respectively disposed in the four quadrants of the first mating slot 111, so that the ejector gates formed by them are respectively disposed in the four quadrants of the eccentric tee. When the four ejector gates are lifted, they can effectively balance and distribute the force, preventing the eccentric tee from tilting during demolding and further improving the demolding effect.

[0033] According to some embodiments of this application, refer to Figure 4 The lower mold 100 also includes an ejector mechanism 190, which is matched with the ejector cavity. It should be noted that one end of the first ejector slot 150, the second ejector slot 160, the third ejector slot 170, and the fourth ejector slot 180 are all connected to the first mating slot 111, and the other end is provided with a process hole communicating with the outside. The ejector mechanism 190 is movably disposed within these process holes. After injection molding, the ejector mechanism 190 lifts the ejector gate located in the ejector cavity, achieving rapid demolding.

[0034] Specifically, refer to Figure 4 The ejector mechanism 190 includes a connecting frame 191, multiple ejector pins 192, and a drive cylinder 193, which are sequentially connected. Specifically, there are four ejector pins 192, each corresponding to a process hole in a first ejector pin slot 150, a second ejector pin slot 160, a third ejector pin slot 170, and a fourth ejector pin slot 180. The four ejector pins 192 are respectively fitted with the first ejector pin slot 150, the second ejector pin slot 160, the third ejector pin slot 170, and the fourth ejector pin slot 180 with a clearance fit. Specifically, the gap between the four ejector pins 192 and the ejector pin cavity is extremely small, allowing the ejector pins 192 to move axially within the ejector pin cavity while effectively preventing molten plastic from flowing to the outside during injection molding through this gap. During injection molding, molten plastic flows into the ejector cavity and into the process hole of the ejector cavity. The flow is finally restricted by the ejector pin 192. After the pressure holding and cooling process, the plastic is molded. At this time, the drive cylinder 193 drives the connecting frame 191 to move towards the lower mold base 110. Then the connecting frame 191 drives multiple ejector pins 192 to move in the process hole of the ejector cavity, lifting the ejector gate located in the process hole to achieve demolding.

[0035] According to some embodiments of this application, refer to Figure 4A matching mechanism is provided between the first core rod 120 and the second core rod 130, allowing them to be connected. Specifically, the matching mechanism is located between the upper sides of the first core rod 120 and the second core rod 130. This matching mechanism enables rapid positioning and connection between the first core rod 120 and the second core rod 130, improving the consistency of the structure and shape after the first core rod 120 and the second core rod 130 are combined and connected.

[0036] Furthermore, referring to Figure 1 and Figure 2 The matching mechanism includes a first positioning groove 121 disposed on the periphery of the first core rod 120 and a positioning protrusion 131 disposed on the second core rod 130 near the end of the first core rod 120. The first positioning groove 121 and the positioning protrusion 131 can be matched and connected.

[0037] Furthermore, referring to Figure 1 and Figure 2 The mandrel assembly also includes a third mandrel 140, which is coaxially opposite to the first mandrel 120. The first mandrel 120, the second mandrel 130, and the third mandrel 140 can be matched and connected. Specifically, the first mandrel 120, the second mandrel 130, and the third mandrel 140 can be combined and connected to form a T-shaped mandrel assembly.

[0038] Furthermore, referring to Figure 1 , Figure 2 and Figure 4 The matching mechanism also includes a second positioning groove 141 disposed on the periphery of the third core rod 140, which can be matched and connected with the positioning protrusion 131. Specifically, the positioning protrusion 131 can be matched and connected with both the first positioning groove 121 and the second positioning groove 141 simultaneously, realizing the positioning and connection between the first core rod 120, the second core rod 130 and the third core rod 140, and improving the consistency of the structure and shape after the first core rod 120, the second core rod 130 and the third core rod 140 are combined and connected.

[0039] It is understood that, in some other embodiments, reference is made to... Figure 4 A positioning mechanism is provided between the middle portion of the first core rod 120 near the second core rod 130, the middle portion of the third core rod 140 near the second core rod 130, and the lower portion of the second core rod 130 near the first core rod 120. Similar to a matching mechanism, the positioning mechanism is also used for matching and positioning when the first core rod 120, second core rod 130, and third core rod 140 are connected. Specifically, a groove is provided on the middle portion of the first core rod 120 near the second core rod 130, and a groove is also provided on the middle portion of the third core rod 140 near the second core rod 130. A hemispherical protrusion is provided on the lower portion of the second core rod 130 near the first core rod 120, together forming the positioning mechanism.

[0040] Furthermore, referring to Figure 4 The lower mold 100 is also provided with a first slide groove 113, a second slide groove 114, and a third slide groove 115. A first mandrel 120 is slidably connected to the first slide groove 113, a second mandrel 130 is slidably connected to the second slide groove 114, and a third mandrel 140 is slidably connected to the third slide groove 115. Specifically, refer to... Figure 1 and Figure 2 The first core rod 120, the second core rod 130, and the third core rod 140 each include a core rod seat and a core rod body. The core rod seats of the first core rod 120, the second core rod 130, and the third core rod 140 are slidably connected to the first slide groove 113, the second slide groove 114, and the third slide groove 115, respectively. By utilizing the first slide groove 113, the second slide groove 114, and the third slide groove 115, the relative movement trajectory of the first core rod 120, the second core rod 130, and the third core rod 140 can be restricted, reducing offset and further improving the consistency of the structure and shape after the first core rod 120, the second core rod 130, and the third core rod 140 are combined and connected.

[0041] It is understood that, in some other embodiments, reference is made to... Figure 1 and Figure 2 The lower mold base 110 is also provided with a third pair of mating grooves 112; see reference Figure 3 The upper mold base 210 is also provided with a fourth mating groove 230; the third mating groove 112 is matched with the fourth mating groove 230. When the lower mold base 110 is matched and connected with the upper mold base 210, the third mating groove 112 and the fourth mating groove 230 together form the gate runner. Specifically, the fourth ejector pin slot 180 and the main runner 240 are respectively connected to the gate runner. The process hole of the fourth ejector pin slot 180 is connected to the gate runner. During injection molding, the molten plastic can flow through the main runner 240 to the gate runner, then flow from the gate runner to the fourth ejector pin slot 180, and finally flow through the fourth ejector pin slot 180 into the cavity 300. At this time, the fourth ejector pin slot 180 also realizes the function of a gate.

[0042] Working principle: The first mandrel 120 and the second mandrel 130 are matched and connected to form a T-shaped mandrel assembly. Then, the lower mold base 110 and the upper mold base 210 are matched and positioned, and then locked and fixed by a locking mechanism. At this time, the second mating groove 220 is matched and connected to the first mating groove 111, and the third mating groove 112 is matched and connected to the fourth mating groove 230. The mandrel assembly, the second mating groove 220, and the first mating groove 111 are matched together to form the cavity 300. The third mating groove 112 and the fourth mating groove 230 together form the gate runner. During injection molding, the molten plastic is injected into the gate runner through the main runner 240, and then flows into the cavity 300 and the ejector pin cavity through the gate runner. The molten plastic in the ejector pin cavity can form multiple ejector pin gates after the holding pressure and cooling process, while the molten plastic in the cavity 300 can form an eccentric tee after the holding pressure and cooling process. After injection molding, the ejector mechanism 190 applies an upward thrust to multiple ejector gates below the process holes of the ejector cavity, which can lift up the eccentric tee together, thus achieving demolding of the eccentric tee.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An eccentric tee mold for pipes, characterized in that, include: The lower mold (100) is provided with a first mating groove (111), a mandrel assembly and an ejector pin cavity. The mandrel assembly is movably disposed in the first mating groove (111). The mandrel assembly includes a first mandrel (120) and a second mandrel (130). The second mandrel (130) is eccentrically disposed relative to the first mandrel (120). The ejector pin cavity is connected to the first mating groove (111). The upper mold (200) is provided with a second mating groove (220) and a main channel (240). The main channel (240) is connected to the second mating groove (220). The second mating groove (220), the first mating groove (111), and the mandrel assembly can be matched to form a cavity (300).

2. The eccentric tee mold for pipes according to claim 1, characterized in that, The ejector pin cavity includes a first ejector pin groove (150) and a second ejector pin groove (160), which are connected to each other on both sides of the first mating groove (111).

3. The eccentric tee mold for pipes according to claim 2, characterized in that, The ejector cavity also includes a third ejector groove (170), which is disposed on the same side of the first mating groove (111) at a distance from the second ejector groove (160).

4. The eccentric tee mold for pipes according to claim 3, characterized in that, The ejector pin cavity also includes a fourth ejector pin groove (180), which is connected to the first mating groove (111). The fourth ejector pin groove (180) and the first ejector pin groove (150) are disposed opposite to each other on both sides of the first mating groove (111). The fourth ejector pin groove (180) and the second ejector pin groove (160) are also disposed opposite to each other on both sides of the first mating groove (111).

5. The eccentric tee mold for pipes according to claim 1, characterized in that, The lower mold (100) also includes an ejector mechanism (190), which is matched with the ejector cavity.

6. The eccentric tee mold for pipes according to claim 1, characterized in that, A matching mechanism is provided between the first core rod (120) and the second core rod (130), and the first core rod (120) and the second core rod (130) can be matched and connected through the matching mechanism.

7. The eccentric tee mold for pipes according to claim 6, characterized in that, The matching mechanism includes a first positioning groove (121) disposed on the periphery of the first core rod (120) and a positioning protrusion (131) disposed on the second core rod (130) near the end of the first core rod (120). The first positioning groove (121) and the positioning protrusion (131) can be matched and connected.

8. The eccentric tee mold for pipes according to claim 7, characterized in that, The core rod assembly further includes a third core rod (140), which is coaxially opposite to the first core rod (120), and the first core rod (120), the second core rod (130) and the third core rod (140) can be matched and connected.

9. The eccentric tee mold for pipes according to claim 8, characterized in that, The matching mechanism further includes a second positioning groove (141) disposed on the periphery of the third core rod (140), the second positioning groove (141) being compatible with the positioning protrusion (131).

10. An eccentric tee mold for pipes according to claim 8 or 9, characterized in that, The lower mold (100) is also provided with a first slide groove (113), a second slide groove (114) and a third slide groove (115). The first mandrel (120) is slidably connected to the first slide groove (113), the second mandrel (130) is slidably connected to the second slide groove (114), and the third mandrel (140) is slidably connected to the third slide groove (115).

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