Forming die of socket and spigot joint

Abstract

The forming mold comprises an outer mold body and an extrusion inner mold body, the outer mold body comprises an outer mold base, a plurality of outer mold single bodies are installed on the outer mold base in a sliding mode in the radial direction, each outer mold single body is driven by a mold opening and closing driving mechanism, and a mold locking device is further fixedly installed on the outer mold base; the extrusion inner mold is axially and slidably mounted on the inner mold support and is driven by the demolding mechanism, the extrusion inner mold and the closed outer mold single bodies are jointly matched to form a mold cavity for forming a socket and spigot joint, a material distribution joint is fixedly connected to the extrusion inner mold, a main feeding channel and a plurality of material distribution pipes are arranged on the material distribution joint, and the main feeding channel is communicated with the material distribution pipes. The material distribution pipe is fixed with the extrusion injection inner mold and is communicated with the mold cavity, and a cooling device for cooling a formed socket and spigot joint is further arranged on the outer mold single body; according to the forming mold, plastics are injected and dispersed, so that the stress of the mold is more uniform, and a mold locking device is additionally used for locking the mold, so that the forming requirement of a bell and spigot joint with a larger size can be met.

Description

Technical Field

[0001] The invention relates to the technical field of forming dies, in particular to a forming die for a socket joint. Background Art

[0002] At present, the composite pipes on the market mainly include steel mesh reinforced composite pipes, steel skeleton reinforced composite pipes and steel wire winding reinforced composite pipes. The composite pipes use the internal metal reinforcement structure to enhance the mechanical properties of the composite pipes. There are many ways to connect composite pipes during installation. The traditional connection methods include hot melting and threaded installation. Such connection methods are complicated to operate and inconvenient to install. At present, the connection of composite pipes mostly adopts the plug-in method. The two connected pipes are directly plugged in through the socket joint. After completion, they are compressed by the compression equipment to form a sealed pipeline. This plug-in method is fast and efficient, and has higher sealing performance. The current molding method of socket joints is mainly to extrude plastic through an extruder and then directly extrude it through a molding die. This method of extrusion molding directly using an extruder has the following disadvantages: 1. The current molding die includes an outer die and an extrusion inner die. Since a number of annular grooves are provided on the socket joint, molding grooves are also provided on the inner wall of the outer die, so the outer die needs to be opened and closed. The outer die opening of the current molding die is driven by a cylinder to open and close, but this driving method has poor synchronization; 2. When the current molding die is used to mold a socket joint with a relatively large size, a greater extrusion force is required after the plastic is squeezed into the mold cavity. The increase in extrusion force requires the outer die to be able to withstand a large pressure. The current method of using only a cylinder to drive the outer die to close may result in insufficient locking force. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a forming mold for a socket joint, which disperses the injected plastic to make the force on the mold more uniform, and additionally uses a clamping device to lock the mold, thereby meeting the forming requirements of larger-sized socket joints.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a forming mold for a socket joint, the forming mold includes an outer mold and an extrusion inner mold that cooperate with each other, the outer mold includes an outer mold base, a plurality of outer mold monomers are radially slidably installed on the outer mold base, each outer mold monomer is driven by an opening and closing mold driving mechanism fixed on the outer mold base, and a locking device for locking adjacent outer mold monomers is also fixedly installed on the outer mold base; the extrusion inner mold is axially slidably installed on the inner mold support and driven by a demolding mechanism, the extrusion inner mold and the outer mold monomer after mold closing cooperate to form a mold cavity for forming the socket joint, the extrusion inner mold is fixedly connected to a feed joint, the feed joint is provided with a main feed channel and a plurality of feed pipes, the feed pipes are fixed to the extrusion inner mold and connected to the mold cavity, and the outer mold monomer is also provided with a cooling device for cooling the formed socket joint.

[0005] As a preferred solution, the outer mold base is a closed frame, and each outer mold unit is radially slidably mounted on the outer mold base. The mold opening and closing drive mechanism includes a drive ring plate rotatably mounted on the outer mold base, and the drive ring plate is located on one side of the outer mold. An arc-shaped drive strip hole is provided on the drive ring plate, and the arc-shaped drive strip hole extends in an arc from the center to the outside. A transmission pin shaft constrained by the arc-shaped drive strip hole is provided on each outer mold unit, and the drive ring plate is driven by a mold opening and closing rotation power device.

[0006] As a preferred solution, a plurality of constraint wheels are rotatably mounted on the outer mold base, and a constraint ring groove is arranged on the wheel surface of the constraint wheel. The driving ring plate is circular and the outer contour is constrained in the constraint ring groove of the constraint wheel. The mold opening and closing rotation power device includes an opening and closing mold cylinder hinged on the outer mold base at one end, and the other end of the opening and closing mold cylinder is hinged on the driving ring plate through a connecting plate.

[0007] As a preferred solution, the locking device includes a locking clamp block, a locking groove is provided on the locking clamp block, the locking clamp block is fixed on the piston rod of the locking cylinder, the locking cylinder is fixed on the outer mold base and the piston rod slides radially, a locking module is provided on the outer mold monomer, and a locking slope is provided on the side of each locking module, and the locking modules on adjacent outer mold monomers cooperate with each other and are clamped by the locking groove on the locking clamp block.

[0008] As a preferred solution, the outer mold monomer includes an outer mold fixing seat, which is radially slidably installed on the outer mold base, and an outer mold body is fixed on the inner side of the outer mold fixing seat. A quarter-arc outer mold surface is provided on the outer mold body, and the locking module is arranged at both ends of the outer mold body. When the mold is closed, all the outer mold surfaces cooperate with the extrusion inner mold to form the mold cavity.

[0009] As a preferred solution, the cooling device includes an independent cooling chamber arranged on each outer mold body, and a cooling water inlet and a cooling water outlet are arranged on the outer mold body. The cooling water inlet and the cooling water outlet are connected to the cooling water circulation supply device through a hose.

[0010] As a preferred solution, the extrusion inner mold includes an upstream inner mold cylinder and a downstream inner mold cylinder, the upstream end of the upstream inner mold cylinder is provided with a flange portion, and the flange portion is provided with a plurality of injection holes connected to the material distribution pipe, and the upstream end face and downstream end face of the upstream inner mold cylinder are also respectively provided with an upstream inner mold ring plate and a downstream connecting ring plate, and the upstream inner ring template is slidably mounted on the inner mold bracket and connected to the demolding mechanism; the diameter of the downstream inner mold cylinder is smaller than the diameter of the upstream inner mold cylinder, and the upstream end of the downstream inner mold cylinder is provided with a downstream inner mold ring plate, and the downstream inner mold ring plate and the downstream connecting ring plate are fixed by bolts.

[0011] After adopting the above technical scheme, the effect of the present invention is as follows: due to the forming mold of the socket joint, the forming mold includes an outer mold and an extrusion inner mold that cooperate with each other, the outer mold includes an outer mold base, and a plurality of outer mold monomers are radially slidably installed on the outer mold base, and each outer mold monomer is driven by an opening and closing mold driving mechanism fixed on the outer mold base, and a locking device for locking adjacent outer mold monomers is also fixedly installed on the outer mold base; the extrusion inner mold is axially slidably installed on the inner mold bracket and driven by the mold withdrawal mechanism, the extrusion inner mold and the outer mold monomer after mold closing cooperate to form a mold cavity for forming the socket joint, and a material distribution joint is fixedly connected to the extrusion inner mold, and a main feed channel and a plurality of material distribution pipes are arranged on the material distribution joint, and the material distribution pipes are fixedly connected to the extrusion inner mold The outer mold monomer is fixed and connected with the mold cavity, and a cooling device for cooling the formed socket joint is also provided on the outer mold monomer; after the outer mold monomer is driven to cooperate by the opening and closing mold driving mechanism, the adjacent outer mold monomer is locked by the locking device, and then the mold cavity is formed by axial sliding extrusion inner mold and outer mold, and the material enters the main feed channel, enters the mold cavity from the distribution joint through the distribution pipe for molding, and then is cooled by the cooling device. After cooling, the extrusion inner mold is driven to be demolded by the demolding mechanism, and the adjacent outer mold monomer is unlocked, and the outer mold is opened, the socket plug is taken out, and the above operation is repeated continuously; the molding mold disperses the plastic injection to make the mold more evenly stressed, and the locking device is additionally used for locking, which can meet the molding requirements of larger-sized socket joints.

[0012] Furthermore, since the outer mold base is a closed frame, each outer mold monomer is radially slidably installed on the outer mold base, and the mold opening and closing driving mechanism includes a driving ring plate rotatably installed on the outer mold base, the driving ring plate is located on one side of the outer mold, and an arc-shaped driving strip hole is provided on the driving ring plate, and the arc-shaped driving strip hole extends in an arc shape from the center to the outside, and each outer mold monomer is provided with a transmission pin constrained by the arc-shaped driving strip hole, and the driving ring plate is driven by the mold opening and closing rotating power device; the driving ring plate is driven to rotate by the mold opening and closing rotating power device, so that the arc-shaped driving strip hole can effectively rotate, so that the transmission pin can be squeezed and driven by the arc-shaped driving strip hole, and the outer mold monomer slides radially, thereby effectively controlling the opening and closing of the outer mold.

[0013] Since a plurality of constraint wheels are rotatably mounted on the outer mold base, a constraint ring groove is arranged on the wheel surface of the constraint wheel, the driving ring plate is circular and its outer contour is constrained in the constraint ring groove of the constraint wheel, the mold opening and closing rotation power device comprises a mold opening and closing cylinder hinged at one end on the outer mold base, and the other end of the mold opening and closing cylinder is hinged to the driving ring plate through a connecting plate; the constraint wheel can effectively assist in supporting the rotation of the driving ring plate, and the constraint ring groove can effectively clamp the driving ring plate, thus ensuring stable rotation, and then the rotation amplitude of the driving ring plate can be controlled by extending and retracting the piston rod of the mold opening and closing cylinder, and both ends of the mold opening and closing cylinder are hinged, which is convenient for the coordination of the driving ring plate during rotation.

[0014] Furthermore, since the locking device includes a locking clamp, a locking groove is provided on the locking clamp, the locking clamp is fixed on the piston rod of the locking cylinder, the locking cylinder is fixed on the outer mold base and the piston rod slides radially, a locking module is provided on the outer mold monomer, and a locking slope is provided on the side of each locking module, and the locking modules on adjacent outer mold monomers cooperate with each other and are clamped by the locking groove on the locking clamp; the locking clamp is driven by the locking cylinder to radially expand and contract, and then the opening and closing mold cylinder drives the outer mold monomers to merge to form the outer mold, so that the locking modules will cooperate with each other, the locking modules are in the locking groove, and the locking slope can effectively guide the locking clamp, thereby ensuring accurate locking, and after locking, the stress during extrusion molding is effectively dispersed, thereby improving the molding effect.

[0015] Furthermore, since the outer mold monomer includes an outer mold fixing seat, the outer mold fixing seat is radially slidably installed on the outer mold base, the outer mold body is fixed on the inner side of the outer mold fixing seat, and the outer mold body is provided with a quarter-arc outer mold surface, and the locking module is arranged at both ends of the outer mold body. When the mold is closed, all the outer mold surfaces cooperate with the extrusion inner mold to form the mold cavity; the outer mold fixing seat and the outer mold body are fixedly installed to each other, which is convenient for production and installation, and the outer mold body can be replaced separately, which improves practicality. The outer mold can effectively form the outer mold body through the radial sliding of the outer mold fixing seat, which is convenient for subsequent shedding.

[0016] Furthermore, since the cooling device includes an independent cooling chamber arranged on each outer mold body, a cooling water inlet and a cooling water outlet are arranged on the outer mold body, and the cooling water inlet and the cooling water outlet are connected to the cooling water circulation supply device through a hose; during molding, the entry of cooling water can effectively cool down the outer mold body, thereby accelerating the molding in the mold cavity and ensuring the molding efficiency.

[0017] Since the extrusion inner mold includes an upstream inner mold cylinder and a downstream inner mold cylinder, a flange portion is provided at the upstream end of the upstream inner mold cylinder, and a plurality of injection holes connected to the material distribution pipe are provided on the flange portion. The upstream end face and the downstream end face of the upstream inner mold cylinder are also respectively provided with an upstream inner mold ring plate and a downstream connecting ring plate. The upstream inner ring template is slidably installed on the inner mold bracket and is connected to the demolding mechanism; the diameter of the downstream inner mold cylinder is smaller than the diameter of the upstream inner mold cylinder, and a downstream inner mold ring plate is provided at the upstream end of the downstream inner mold cylinder, and the downstream inner mold ring plate is fixed to the downstream connecting ring plate by bolts; it is divided into an upstream inner mold cylinder and a downstream inner mold cylinder, which is convenient for production and assembly, and the upstream inner mold ring plate ensures the accuracy and stability of the extrusion inner mold during axial movement, and the downstream connecting ring plate and the downstream inner mold ring plate facilitate the connection between the upstream inner mold cylinder and the downstream inner mold cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 is a stereogram of an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of an embodiment of the present invention;

[0021] Figure 3 is a front view of an embodiment of the present invention;

[0022] Figure 4 is a cross-sectional view of an embodiment of the present invention

[0023] Figure 5 It is a schematic structural diagram of a mold monomer outside the embodiment of the present invention;

[0024] Figure 6 2 is a schematic structural diagram of an extrusion inner mold according to an embodiment of the present invention;

[0025] In the attached figure: 1, outer mold base; 2, outer mold unit; 3, material distribution joint; 4, main feed channel; 5, material distribution pipe; 6, driving ring plate; 7, arc-shaped driving strip hole; 8, driving pin shaft; 9, restraining wheel; 10, restraining ring groove; 11, opening and closing mold cylinder; 12, connecting plate; 13, clamping block; 14, clamping groove; 15, locking module; 16, locking inclined surface; 17, outer mold fixing seat; 18, outer mold body; 19, outer mold surface; 20, diameter 1. strip-shaped hole; 21. through-strip-shaped hole; 22. guide roller; 23. cooling chamber; 24. cooling water inlet; 25. cooling water outlet; 26. upstream inner mold cylinder; 27. downstream inner mold cylinder; 28. flange; 29. ​​injection hole; 30. upstream inner mold ring plate; 31. downstream connecting ring plate; 32. downstream inner mold ring plate; 33. fixed support frame; 34. first guide rod; 35. second guide rod; 36. inner mold connecting frame; 37. clamping cylinder. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below through specific examples.

[0027] like Figures 1 to 6 As shown, a forming mold for a socket joint comprises an outer mold and an extrusion inner mold that cooperate with each other, the outer mold comprises an outer mold base 1, a plurality of outer mold monomers 2 are radially slidably mounted on the outer mold base 1, each outer mold monomer 2 is driven by an opening and closing mold driving mechanism fixed to the outer mold base 1, and a locking device for locking adjacent outer mold monomers 2 is also fixedly mounted on the outer mold base 1; the extrusion inner mold is axially slidably mounted on the inner mold bracket and driven by a mold withdrawal mechanism, the extrusion inner mold and the outer mold monomer 2 after mold closing cooperate to form a mold cavity for forming the socket joint, a feed joint 3 is fixedly connected to the extrusion inner mold, a main feed channel 4 and a plurality of feed pipes 5 are arranged on the feed joint 3, the feed pipes 5 are fixed to the extrusion inner mold and are connected to the mold cavity, and a cooling device for cooling the formed socket joint is also arranged on the outer mold monomer 2.

[0028] like Figures 1 to 3As shown, the outer mold base 1 is a closed frame, and each outer mold monomer 2 is radially slidably installed on the outer mold base 1. The mold opening and closing driving mechanism includes a driving ring plate 6 rotatably installed on the outer mold base 1, and the driving ring plate 6 is located on one side of the outer mold. An arc-shaped driving strip hole 7 is provided on the driving ring plate 6, and the arc-shaped driving strip hole 7 extends in an arc shape from the center to the outside. Each outer mold monomer 2 is provided with a transmission pin 8 constrained by the arc-shaped driving strip hole 7, and the driving ring plate 6 is driven by the mold opening and closing rotating power device; the driving ring plate 6 is driven to rotate by the mold opening and closing rotating power device, so that the arc-shaped driving strip hole 7 can effectively rotate, so that the transmission pin 8 can be squeezed and driven by the arc-shaped driving strip hole 7, so that the outer mold monomer 2 slides radially, thereby effectively controlling the opening and closing of the outer mold.

[0029] Furthermore, a plurality of constraint wheels 9 are rotatably mounted on the outer mold base 1, and a constraint ring groove 10 is arranged on the wheel surface of the constraint wheel 9. The driving ring plate 6 is circular and its outer contour is constrained in the constraint ring groove 10 of the constraint wheel 9. The mold opening and closing rotation power device includes a mold opening and closing cylinder 11, one end of which is hinged on the outer mold base 1, and the other end of the mold opening and closing cylinder 11 is hinged on the driving ring plate 6 through a connecting plate 12; there are four constraint wheels 9, which are respectively located around the driving ring plate 6. The constraint wheels 9 can effectively assist in supporting the rotation of the driving ring plate 6, and the constraint ring groove 10 can effectively clamp the driving ring plate 6, so as to ensure stable rotation. Then, the rotation amplitude of the driving ring plate 6 can be controlled by extending and retracting the piston rod of the mold opening and closing cylinder 11. Both ends of the mold opening and closing cylinder 11 are hinged, which is convenient for the coordination of the driving ring plate 6 when rotating.

[0030] like Figure 1 and Figure 5 As shown, the locking device includes a locking clamp 13, a locking groove 14 is provided on the locking clamp 13, the locking clamp 13 is fixed on the piston rod of the locking cylinder 37, the locking cylinder 37 is fixed on the outer mold base 1 and the piston rod slides radially, and a locking module 15 is provided on the outer mold monomer 2, and a locking slope 16 is provided on the side of each locking module 15. The locking modules 15 on adjacent outer mold monomers 2 cooperate with each other and are clamped by the locking groove on the locking clamp; the locking clamp 13 is driven to extend radially by the locking cylinder 37, and then the opening and closing mold cylinder 11 drives the outer mold monomers 2 to merge to form an outer mold, so that the locking modules 15 will cooperate with each other, the locking modules 15 are in the locking groove 14, and the locking slope 16 can effectively guide the locking clamp, thereby ensuring accurate locking, and after locking, the stress during extrusion molding is effectively dispersed, thereby improving the molding effect.

[0031] like Figure 5As shown, the outer mold monomer 2 includes an outer mold fixing seat 17, and the outer mold fixing seat 17 is radially slidably installed on the outer mold base 1. An outer mold body 18 is fixed on the inner side of the outer mold fixing seat 17. A quarter-circular outer mold surface 19 is provided on the outer mold body 18. The locking module 15 is arranged at both ends of the outer mold body 18. When the mold is closed, all the outer mold surfaces 19 cooperate with the extrusion inner mold to form the mold cavity; the transmission pin 8 is fixedly installed on the outer mold fixing seat 17, and guide rollers 22 are also vertically fixed on the outer mold fixing seat 17 on both sides of the transmission pin 8. A radial strip hole 20 is provided on the outer mold base 1 to constrain the vertical guide roller 22 to enable the outer mold body 18 to slide radially. Then, a through strip hole 21 is provided on the outer mold base 1 for the transmission pin 8 to slide radially. When the arc-shaped driving strip hole 7 squeezes the transmission pin 8, the radial sliding of the outer mold body 18 is stable. The outer mold fixing base 17 and the outer mold body 18 are fixedly installed to each other, which is convenient for production and installation, and the outer mold body 18 can be replaced separately, which improves practicality. The outer mold can effectively form the outer mold body 18 through the radial sliding of the outer mold fixing base 17, which is convenient for subsequent shedding.

[0032] like Figure 4 and Figure 5 As shown, the cooling device includes an independent cooling chamber 23 arranged on each outer mold body 18, and a cooling water inlet 24 and a cooling water outlet 25 are arranged on the outer mold body 18, and the cooling water inlet 24 and the cooling water outlet 25 are connected to the cooling water circulation supply device through a hose; the cooling water is input into the cooling chamber 23 through the cooling water inlet 24 through the cooling water circulation supply device, and then discharged from the cooling water outlet 25, so that the outer mold body 18 is effectively circulated to cool, thereby effectively forming the socket joint and improving the use effect.

[0033] like Figure 4 and Figure 6As shown, the extrusion inner mold includes an upstream inner mold cylinder 26 and a downstream inner mold cylinder 27. The upstream end of the upstream inner mold cylinder 26 is provided with a flange portion 28, and the flange portion 28 is provided with a plurality of injection holes 29 connected to the material distribution pipe 5. The upstream end face and the downstream end face of the upstream inner mold cylinder 26 are also provided with an upstream inner mold ring plate 30 and a downstream connecting ring plate 31, respectively. The upstream inner ring template is slidably mounted on the inner mold bracket and connected to the demolding mechanism; the downstream inner mold cylinder 27 is provided with a flange portion 28, and the flange portion 28 is provided with a plurality of injection holes 29 connected to the material distribution pipe 5. The upstream end face and the downstream end face of the upstream inner mold cylinder 26 are also provided with an upstream inner mold ring plate 30 and a downstream connecting ring plate 31, respectively. The upstream inner ring template is slidably mounted on the inner mold bracket and connected to the demolding mechanism; The diameter is smaller than that of the upstream inner mold cylinder 26, and a downstream inner mold ring plate 32 is provided at the upstream end of the downstream inner mold cylinder 27, and the downstream inner mold ring plate 32 is fixed to the downstream connecting ring plate 31 by bolts; it is divided into the upstream inner mold cylinder 26 and the downstream inner mold cylinder 27, which is convenient for production and assembly, and the upstream inner mold ring plate 30 ensures the accuracy and stability of the extrusion inner mold during axial movement, and the downstream connecting ring plate 31 and the downstream inner mold ring plate 32 facilitate the connection between the upstream inner mold cylinder 26 and the downstream inner mold cylinder 27.

[0034] The inner mold bracket includes a fixed support frame 33, on which a first guide rod 34 and a second guide rod 35 are arranged, the first guide rod 34 and the second guide rod 35 are respectively located on both sides of the main feed channel 4, inner mold connecting frames 36 are respectively slidably installed on the first guide rod 34 and the second guide rod 35, and the inner mold connecting frames 36 are respectively fixedly connected to the upstream inner mold ring plate 30, and the demolding mechanism is a longitudinal sliding mechanism located upstream of the main feed channel 4, driven by a hydraulic cylinder, and is not described in detail herein.

[0035] The working principle of this embodiment is as follows: first, the piston rod of the mold opening and closing cylinder 11 is retracted to merge the outer mold monomer 2 into an outer mold, the mold locking cylinder 37 drives the clamping block to extend, and the mold locking groove 14 clamps the locking module 15. The extrusion inner mold slides axially with the outer mold through the first guide rod 34 and the second guide rod 35 to cooperate with the outer mold, and then the main feed channel 4 enters the material, and enters the mold cavity from the material distribution joint 3 through the distribution pipe 5 for molding. The cooling water circulation supply device inputs cooling water into the cooling chamber 23 through the cooling water inlet 24, and then discharges it from the cooling water outlet 25 to cool the socket joint. After cooling is completed, the mold locking cylinder 37 drives the clamping block to retract, and the piston rod of the mold opening and closing cylinder 11 extends to open the outer mold. Then the demolding mechanism drives the extrusion inner mold to withdraw, remove the socket joint, and then repeat the above operation.

[0036] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A forming die for a socket joint, characterized in that: The molding die comprises an outer die and an extrusion inner die that cooperate with each other, the outer die comprises an outer die base, a plurality of outer die monomers are radially slidably mounted on the outer die base, each outer die monomer is driven by an opening and closing die driving mechanism fixed on the outer die base, and a locking device for locking adjacent outer die monomers is also fixedly mounted on the outer die base; the extrusion inner die is axially slidably mounted on the inner die support and driven by a mold withdrawal mechanism, the extrusion inner die and the outer die monomer after mold closing cooperate to form a mold cavity for molding a socket joint, a feed joint is fixedly connected to the extrusion inner die, a main feed channel and a plurality of feed pipes are arranged on the feed joint, the feed pipes are fixed to the extrusion inner die and communicated with the mold cavity, and a cooling device for cooling the formed socket joint is also arranged on the outer die monomer.

2. A forming die for a socket joint as claimed in claim 1, characterized in that: The outer mold base is a closed frame, and each outer mold monomer is radially slidably mounted on the outer mold base. The mold opening and closing drive mechanism includes a drive ring plate rotatably mounted on the outer mold base, and the drive ring plate is located on one side of the outer mold. An arc-shaped drive strip hole is provided on the drive ring plate, and the arc-shaped drive strip hole extends in an arc from the center to the outside. Each outer mold monomer is provided with a transmission pin shaft constrained by the arc-shaped drive strip hole, and the drive ring plate is driven by the mold opening and closing rotation power device.

3. A forming die for a socket joint as claimed in claim 2, characterized in that: A plurality of constraint wheels are rotatably mounted on the outer mold base, and a constraint ring groove is arranged on the wheel surface of the constraint wheel. The driving ring plate is circular and its outer contour is constrained in the constraint ring groove of the constraint wheel. The mold opening and closing rotation power device includes a mold opening and closing cylinder hinged on the outer mold base at one end, and the other end of the mold opening and closing cylinder is hinged on the driving ring plate through a connecting plate.

4. A forming die for a socket joint as claimed in claim 1, characterized in that: The clamping device includes a clamping block, a clamping groove is provided on the clamping block, the clamping block is fixed on the piston rod of the clamping cylinder, the clamping cylinder is fixed on the outer mold base and the piston rod slides radially, a locking module is provided on the outer mold monomer, a locking inclined surface is provided on the side of each locking module, and the locking modules on adjacent outer mold monomers cooperate with each other and are clamped by the locking groove on the locking clamping block.

5. A forming die for a socket joint as claimed in claim 4, characterized in that: The outer mold monomer includes an outer mold fixing seat, which is radially slidably installed on the outer mold base. An outer mold body is fixed on the inner side of the outer mold fixing seat. A quarter-arc outer mold surface is provided on the outer mold body. The locking modules are arranged at both ends of the outer mold body. When the mold is closed, all the outer mold surfaces cooperate with the extrusion inner mold to form the mold cavity.

6. A forming die for a socket joint as claimed in claim 5, characterized in that: The cooling device comprises an independent cooling chamber arranged on each outer mold body. A cooling water inlet and a cooling water outlet are arranged on the outer mold body. The cooling water inlet and the cooling water outlet are connected to the cooling water circulation supply device through a hose.

7. A forming die for a socket joint as claimed in claim 1, characterized in that: The extrusion inner mold comprises an upstream inner mold cylinder and a downstream inner mold cylinder, the upstream end of the upstream inner mold cylinder is provided with a flange portion, the flange portion is provided with a plurality of injection holes connected with the material distribution pipe, the upstream end face and the downstream end face of the upstream inner mold cylinder are also respectively provided with an upstream inner mold ring plate and a downstream connecting ring plate, the upstream inner ring template is slidably mounted on the inner mold bracket and is connected to the demolding mechanism; the diameter of the downstream inner mold cylinder is smaller than the diameter of the upstream inner mold cylinder, the upstream end of the downstream inner mold cylinder is provided with a downstream inner mold ring plate, and the downstream inner mold ring plate and the downstream connecting ring plate are fixed by bolts.

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