An extrusion machine for composite pipe socket joints

Abstract

The utility model discloses a kind of composite pipe socket joint's extrusion injection machine, frame is fixed with extrusion injection cylinder, downstream end of extrusion injection cylinder is provided with feed inlet, extrusion injection cylinder is provided with extrusion injection piston, frame is fixed with screw extruder, downstream of extrusion injection cylinder is communicated with distribution joint, distribution joint and extrusion injection cylinder between still be provided with reversing valve, distribution joint is provided with several distribution pipes;Frame is provided with longitudinal guide rail, longitudinal guide rail is vertically slidably installed with longitudinal slide, extrusion injection cylinder and extruder are fixedly installed on longitudinal slide, frame is installed with extrusion injection mould, extrusion injection mould includes outer mould and extrusion injection inner mould, outer mould includes outer mould base, several outer mould monomers are installed on outer mould base, locking device is also fixedly installed on outer mould base;Extrusion injection inner mould is installed on frame;The extrusion injection machine extrudes the material extruded by extruder into extrusion injection mould using the mode of extrusion, filling force in mould is greater, density of socket joint after forming is more uniform.

Description

Technical Field

[0001] This invention relates to the field of composite pipe socket technology, and more particularly to an extrusion machine for composite pipe socket joints. Background Technology

[0002] Currently, the main types of composite pipes on the market include steel wire mesh reinforced composite pipes, steel skeleton reinforced composite pipes, and steel wire spiral reinforced composite pipes. Composite pipes utilize internal metal reinforcement structures to enhance their mechanical properties. There are various connection methods for composite pipes during installation. Traditional methods include heat fusion and threaded connection, but these are complex and inconvenient to install. Currently, composite pipes are mostly connected using a plug-in method. Two connected pipes are directly plugged into a socket joint, and then compressed using a clamping device to form a sealed pipeline. This plug-in method is fast, efficient, and provides a higher level of sealing. The current method of forming socket joints mainly involves extruding plastic through an extruder and then directly extruding it through a molding die. This method of directly extruding the material through an extruder has the following disadvantages: 1. The extrusion pressure of the material during continuous extrusion is insufficient, which directly leads to insufficient filling force of the plastic filling molding die, resulting in insufficient material compaction and uneven density of the formed socket joint; 2. The current molding die generally includes an outer mold and an inner extrusion mold. Since the socket joint has several annular grooves, and the inner wall of the outer mold also has forming grooves, the outer mold needs to be opened and closed. Currently, the outer mold of the molding die is opened and closed by a hydraulic cylinder, but this driving method has poor synchronization. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an extrusion machine for composite pipe socket joints. The extrusion machine uses an extrusion method to squeeze the material extruded by the extruder into the extrusion die. The filling force in the die is greater and the density of the formed socket joint is more uniform.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: an extrusion machine for composite pipe socket joints, comprising a frame, an extrusion cylinder fixed on the frame, an extrusion cylinder having an extrusion cavity, a feed inlet at the downstream end of the extrusion cylinder, an extrusion piston pushed by an extrusion cylinder inside the extrusion cylinder, a screw extruder fixed on the frame, the discharge port of the screw extruder communicating with the feed inlet of the extrusion cylinder, a distribution joint communicating downstream of the extrusion cylinder, a reversing valve being provided between the distribution joint and the extrusion cylinder, and a plurality of distribution pipes being provided on the distribution joint; a longitudinal guide rail is provided on the frame, a longitudinal slide block is slidably mounted on the longitudinal guide rail, the extrusion cylinder and the extruder are both fixedly mounted on the longitudinal slide block, and a series of components are provided on the frame. The longitudinal power unit drives the longitudinal slide block to slide. An extrusion mold is also installed on the frame. The extrusion mold includes a cooperating outer mold and an inner mold. The outer mold includes an outer mold base fixed to the frame. Several outer mold units are radially slidably mounted on the outer mold base. Each outer mold unit is driven by an opening and closing mold drive mechanism fixed to the outer mold base. A locking device for locking adjacent outer mold units is also fixedly installed on the outer mold base. The inner mold is mounted on the frame via a longitudinal sliding mechanism. The inner mold and the closed outer mold units cooperate to form the mold cavity for forming a socket joint. The material distribution pipe is fixed to the inner mold and communicates with the mold cavity. A cooling device for cooling the formed socket joint is also provided on the outer mold unit.

[0005] As a preferred embodiment, the mold opening and closing drive mechanism includes a drive ring plate rotatably mounted on the outer mold base. The drive ring plate is located on one side of the outer mold. The drive ring plate is provided with an arc-shaped drive bar hole that extends arc-shapedly from the center outward. Each outer mold unit is provided with a transmission pin that is constrained by the arc-shaped drive bar hole. The drive ring plate is driven by a mold opening and closing rotation power device.

[0006] As a preferred embodiment, a plurality of constraint wheels are rotatably mounted on the outer mold base, and constraint ring grooves are provided on the wheel surfaces of the constraint wheels. The drive ring plate is circular and its outer contour is constrained within the constraint ring grooves of the constraint wheels. The mold opening and closing rotation power device includes a mold opening and closing cylinder with one end hinged to the outer mold base and the other end of the mold opening and closing cylinder hinged to the drive ring plate.

[0007] As a preferred embodiment, the mold-locking device includes a mold-locking clamping block with a mold-locking groove. The mold-locking clamping block is fixed to the piston rod of the mold-locking cylinder. The mold-locking cylinder is fixed to the outer mold base and the piston rod slides radially. Each outer mold unit is provided with a locking module. Each locking module has a locking slope on its side. The locking modules on adjacent outer mold units cooperate with each other and are clamped by the locking groove on the locking clamping block.

[0008] As a preferred embodiment, the outer mold unit includes an outer mold fixing seat, which is radially slidably mounted on the outer mold base. An outer mold body is fixed to the inner side of the outer mold fixing seat. The outer mold body is provided with a quarter-circle outer mold surface. The locking module is provided at both ends of the outer mold body. The cooling device includes a cooling chamber provided on each outer mold body. The outer mold body is provided with a cooling water inlet and a cooling water outlet. The cooling water inlet and the cooling water outlet are connected to a cooling water circulation supply device through hoses.

[0009] As a preferred embodiment, an upstream support and a downstream support are fixedly installed on the longitudinal slide. The injection cylinder is fixed on the downstream support, the injection cylinder is fixed on the upstream support and the piston rod extends into the injection cylinder, a three-way pipe section is fixed at the downstream end of the injection cylinder, the reversing valve is connected to the three-way pipe section, and the screw extruder is also fixed on the upstream support. The discharge port of the screw extruder is connected and fixed to the three-way pipe section through a vertical connecting pipe section.

[0010] As a preferred embodiment, the longitudinal sliding mechanism includes a fixed support frame fixed on the machine frame. The fixed support frame is provided with a first guide rod and a second guide rod. The first guide rod and the second guide rod are respectively located on both sides of the material distribution joint. An inner mold connecting frame is slidably installed on the first guide rod and the second guide rod. The inner mold connecting frame is fixedly connected to the upstream end face of the extrusion inner mold.

[0011] As a preferred embodiment, the reversing valve includes a valve plate that is horizontally slidably mounted on the three-way pipe section. The valve plate is provided with a connecting hole that connects the inner channel of the three-way pipe section. A drive cylinder that drives the valve plate to move horizontally is fixed to the outside of the three-way pipe section.

[0012] After adopting the above technical solution, the effect of the present invention is as follows: The extrusion machine for composite pipe socket joints includes a frame, an extrusion cylinder fixed on the frame, an extrusion cavity on the extrusion cylinder, a feed inlet at the downstream end of the extrusion cylinder, an extrusion piston pushed by an extrusion cylinder inside the extrusion cylinder, a screw extruder fixed on the frame, a connection between the discharge port of the screw extruder and the feed inlet of the extrusion cylinder, a distribution joint connected downstream of the extrusion cylinder, a reversing valve between the distribution joint and the extrusion cylinder, and several distribution pipes on the distribution joint; a longitudinal guide rail is provided on the frame, and longitudinal... A longitudinal slide block is slidably mounted on the extrusion cylinder and the extruder. A longitudinal power unit for driving the longitudinal slide block to slide is mounted on the frame. An extrusion die is also mounted on the frame. The extrusion die includes a mating outer die and an inner die. The outer die includes an outer die base fixed to the frame. Several outer die units are radially slidably mounted on the outer die base. Each outer die unit is driven by an opening and closing die drive mechanism fixed to the outer die base. A locking device for locking adjacent outer die units is also fixedly mounted on the outer die base. The inner die is mounted on the frame via a longitudinal sliding mechanism. The inner mold and the outer mold unit, after mold closing, work together to form the mold cavity for forming the socket joint. The distribution pipe is fixed to the inner mold and communicates with the mold cavity. The outer mold unit is also equipped with a cooling device for cooling the formed socket joint. First, the outer mold units are driven to merge and cooperate by the mold opening and closing drive mechanism. Then, the adjacent outer mold units are locked by the mold locking device. Next, the longitudinal power unit drives the longitudinal slide to slide, which drives the extrusion barrel and extruder to slide longitudinally. At the same time, it also drives the inner mold to slide longitudinally and cooperate with the outer mold to form the mold cavity. The longitudinal sliding mechanism ensures the stability of the longitudinal sliding of the inner mold. The reversing valve causes the screw extruder to continuously supply material to the inner mold. Material is extruded into the cavity, and then the extrusion is stopped by the reversing valve. The extrusion piston is pushed by the extrusion cylinder to force the material out of the distribution joint, into the distribution pipe, and into the mold cavity for molding. Then, it is cooled by the cooling device. After cooling, the adjacent outer mold unit is unlocked and the outer mold is opened. The longitudinal power device drives the longitudinal slide to slide, causing the extrusion cylinder and extruder to retract longitudinally. At the same time, the inner extrusion mold is also retracted longitudinally. The socket is removed, and the above operation is repeated continuously. This extruder uses the extrusion method to force the material extruded by the extruder into the extrusion mold. The filling force in the mold is greater, and the density of the formed socket is more uniform.

[0013] Furthermore, the mold opening and closing drive mechanism includes a drive ring plate rotatably mounted on the outer mold base. The drive ring plate is located on one side of the outer mold and has an arc-shaped drive bar hole that extends arc-shapedly from the center outward. Each outer mold unit is provided with a transmission pin that is constrained by the arc-shaped drive bar hole. The drive ring plate is driven by the mold opening and closing rotation power device. By driving the drive ring plate to rotate through the mold opening and closing rotation power device, the arc-shaped drive bar hole can be effectively rotated, allowing the transmission pin to be squeezed and driven by the arc-shaped drive bar hole, causing the outer mold unit to slide radially, thereby effectively controlling the opening and closing of the outer mold.

[0014] Furthermore, since several constraint wheels are rotatably mounted on the outer mold base, and constraint ring grooves are provided on the wheel surfaces of the constraint wheels, the driving ring plate is circular and its outer contour is constrained within the constraint ring grooves of the constraint wheels. The mold opening and closing rotation power device includes a mold opening and closing cylinder with one end hinged to the outer mold base, and the other end of the mold opening and closing cylinder hinged to the driving ring plate. The constraint wheels can effectively assist in supporting the rotation of the driving ring plate, and the constraint ring grooves can effectively hold the driving ring plate, thus ensuring stable rotation. Then, the rotation amplitude of the driving ring plate can be controlled by the extension and retraction of the piston rod of the mold opening and closing cylinder. Both ends of the mold opening and closing cylinder are hinged, which facilitates the cooperation when the driving ring plate rotates.

[0015] Furthermore, the mold-locking device includes a mold-locking clamping block with a mold-locking groove. The mold-locking clamping block is fixed to the piston rod of the mold-locking cylinder, which is fixed to the outer mold base and the piston rod slides radially. Each outer mold unit is equipped with a locking module, and each locking module has a locking ramp on its side. The locking modules on adjacent outer mold units cooperate with each other and are clamped by the locking groove on the locking clamping block. The mold-locking cylinder drives the mold-locking clamping block to extend and retract radially, and then the mold-opening and closing cylinder drives the outer mold units to merge to form the outer mold. In this way, the locking modules cooperate with each other, the locking modules are located in the mold-locking groove, and the locking ramp can effectively guide the locking clamping block, thereby ensuring accurate locking and effectively dispersing the stress during extrusion molding after locking, thus improving the molding effect.

[0016] Furthermore, since the outer mold unit includes an outer mold fixing seat, which is radially slidably mounted on the outer mold base, and the outer mold body is fixed to the inner side of the outer mold fixing seat, the outer mold body is provided with a quarter-circle outer mold surface, the locking module is provided at both ends of the outer mold body, and the cooling device includes a cooling chamber provided on each outer mold body, and the outer mold body is provided with a cooling water inlet and a cooling water outlet, which are connected to a cooling water circulation supply device through hoses; the outer mold fixing seat and the outer mold body are fixedly installed to each other, which is convenient for production installation, and the outer mold body can be replaced separately, improving practicality. The radial sliding of the outer mold fixing seat allows the outer mold body to be effectively formed, which is convenient for subsequent removal; at the same time, the entry of cooling water during molding can effectively cool the outer mold body, thereby accelerating the molding in the mold cavity and ensuring molding efficiency.

[0017] Furthermore, since an upstream support and a downstream support are fixedly installed on the longitudinal slide, the extrusion cylinder is fixed on the downstream support, the extrusion cylinder is fixed on the upstream support and its piston rod extends into the extrusion cylinder, a three-way pipe section is fixed at the downstream end of the extrusion cylinder, the reversing valve is connected to the three-way pipe section, and the screw extruder is also fixed on the upstream support. The discharge port of the screw extruder is connected and fixed to the three-way pipe section through a vertical connecting pipe section. In this way, the upstream support and the downstream support are both fixedly installed on the longitudinal slide to ensure synchronous sliding. Then, the feed and discharge can be flexibly switched through the reversing valve connected to the three-way pipe section, making it simple and convenient to use.

[0018] Furthermore, the longitudinal sliding mechanism includes a fixed support frame fixed on the machine frame. The fixed support frame is provided with a first guide rod and a second guide rod. The first guide rod and the second guide rod are respectively located on both sides of the material distribution joint. Inner mold connecting frames are slidably installed on the first guide rod and the second guide rod. The inner mold connecting frames are respectively fixedly connected to the upstream end face of the extrusion inner mold. Since the extrusion inner mold moves synchronously when the longitudinal slide moves, the support of the first guide rod and the second guide rod can ensure the stability of the longitudinal movement of the extrusion inner mold, so that the extrusion inner mold and the outer mold can be accurately matched.

[0019] Furthermore, the reversing valve includes a valve plate that is horizontally slidably mounted on the three-way pipe section. The valve plate is provided with a connecting hole that connects the inner channel of the three-way pipe section. A driving cylinder that drives the valve plate to move horizontally is fixed to the outside of the three-way pipe section. The driving cylinder can effectively drive the valve plate to slide, thereby changing the position of the connecting hole. The connecting hole can ensure that the material squeezed by the piston rod of the extrusion cylinder from the extrusion cylinder enters the material distribution joint through the connecting hole. The switching is flexible and convenient. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a perspective view of an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of one end of the outer mold and the inner extrusion mold in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure at the other end of the outer mold and the inner extrusion mold in an embodiment of the present invention;

[0025] Figure 5 This is a front view of the outer mold in an embodiment of the present invention;

[0026] Figure 6 This is a cross-sectional view of the outer mold and the inner extrusion mold in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the outer mold unit in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the inner mold for extrusion according to an embodiment of the present invention;

[0029] Figure 9 yes Figure 1 A magnified view of a section at point A;

[0030] In the attached diagram: 1. Outer mold base; 2. Outer mold unit; 3. Material distribution joint; 4. Mold locking cylinder; 5. Material distribution pipe; 6. Drive ring plate; 7. Arc-shaped drive bar hole; 8. Transmission pin; 9. Constraint wheel; 10. Constraint ring groove; 11. Mold opening and closing cylinder; 12. Connecting plate; 13. Mold locking clamp; 14. Mold locking groove; 15. Locking module; 16. Locking slope; 17. Outer mold fixing base; 18. Outer mold body; 19. Outer mold surface; 2 0. Radial strip hole; 21. Through strip 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;

[0031] 101. Frame; 102. Extrusion cylinder; 103. Extrusion cavity; 104. Feed inlet; 105. Extrusion piston; 106. Extrusion cylinder; 107. Screw extruder; 108. Discharge port; 109. Reversing valve; 110. Longitudinal guide rail; 111. Longitudinal slide; 112. Upstream support; 113. Downstream support; 114. T-joint section; 115. Connecting section; 116. Fixing plate; 117. Longitudinal sliding cylinder; 118. Valve plate; 119. Connecting hole; 120. Drive cylinder. Detailed Implementation

[0032] The present invention will be further described in detail below through specific embodiments.

[0033] like Figures 1 to 9 As shown, an extrusion press for a composite pipe socket joint includes a frame 101, an extrusion cylinder 102 fixed on the frame 101, an extrusion cavity 103 provided on the extrusion cylinder 102, a feed port 104 provided at the downstream end of the extrusion cylinder 102, an extrusion piston 105 pushed by an extrusion cylinder 106 provided inside the extrusion cylinder 102, and a screw extruder 107 fixed on the frame 101, with a discharge port 1 of the screw extruder 107. The extrusion cylinder 102 is connected to the feed inlet 104 of the extrusion cylinder 102. A distribution joint 3 is connected downstream of the extrusion cylinder 102. A reversing valve 109 is also provided between the distribution joint 3 and the extrusion cylinder 102. Several distribution pipes 5 are provided on the distribution joint 3. A longitudinal guide rail 110 is provided on the frame 101. A longitudinal slide block 111 is longitudinally slidably mounted on the longitudinal guide rail 110. The extrusion cylinder 102 and the extruder are both fixedly mounted on the frame. On the longitudinal slide 111, a longitudinal power device for driving the longitudinal slide 111 to slide is provided on the frame 101. An extrusion mold is also installed on the frame 101. The extrusion mold includes an outer mold and an inner mold that cooperate with each other. The outer mold includes an outer mold base 1 fixed on the frame 101. A plurality of outer mold units 2 are radially slidably installed on the outer mold base 1. Each outer mold unit 2 is driven by an opening and closing mold driving mechanism fixed on the outer mold base 1. A mold locking device for locking adjacent outer mold units 2 is also fixedly installed on the outer mold base 1. The inner mold is installed on the frame 101 through a longitudinal sliding mechanism. The inner mold and the outer mold units 2 after mold closing cooperate to form the mold cavity for forming a socket joint. The material distribution pipe 5 is fixed to the inner mold and communicates with the mold cavity. A cooling device for cooling the formed socket joint is also provided on the outer mold unit 2.

[0034] like Figures 3 to 5As shown, the mold opening and closing drive mechanism includes a drive ring plate 6 rotatably mounted on the outer mold base 1. The drive ring plate 6 is located on one side of the outer mold. The drive ring plate 6 is provided with an arc-shaped drive bar hole 7, which extends arc-shapedly from the center outward. Each outer mold unit 2 is provided with a transmission pin 8 constrained by the arc-shaped drive bar hole 7. The drive ring plate 6 is driven by the mold opening and closing rotation power device. The outer mold base 1 is a closed frame. The drive ring plate 6 is driven to rotate by the mold opening and closing rotation power device, so that the arc-shaped drive bar hole 7 can be effectively rotated, and the transmission pin 8 can be squeezed and driven by the arc-shaped drive bar hole 7, so that the outer mold unit 2 can slide radially, thereby effectively controlling the opening and closing of the outer mold.

[0035] Furthermore, several constraint wheels 9 are rotatably mounted on the outer mold base 1. The wheel surface of the constraint wheels 9 is provided with constraint ring grooves 10. The drive ring plate 6 is circular and its outer contour is constrained within the constraint ring grooves 10 of the constraint wheels 9. The mold opening and closing rotation power device includes a mold opening and closing cylinder 11 with one end hinged to the outer mold base 1. The other end of the mold opening and closing cylinder 11 is hinged to the drive ring plate 6 through a connecting plate 12. There are four constraint wheels 9, which are located around the drive ring plate 6. The constraint wheels 9 can effectively assist in supporting the rotation of the drive ring plate 6, and the constraint ring grooves 10 can effectively hold the drive ring plate 6, thus ensuring stable rotation. Then, the rotation amplitude of the drive ring plate 6 can be controlled by the extension and retraction of the piston rod of the mold opening and closing cylinder 11. Both ends of the mold opening and closing cylinder 11 are hinged to facilitate the cooperation when the drive ring plate 6 rotates.

[0036] like Figure 3 and Figure 7 As shown, the mold clamping device includes a mold clamping block 13, on which a mold clamping groove 14 is provided. The mold clamping block 13 is fixed on the piston rod of the mold clamping cylinder 4. The mold clamping cylinder 4 is fixed on the outer mold base 1 and the piston rod slides radially. The outer mold unit 2 is provided with a locking module 15. Each locking module 15 has a locking inclined surface 16 on its side. The locking modules 15 on adjacent outer mold units 2 cooperate with each other and are clamped by the locking groove on the locking clamping block. The mold clamping block 13 is driven to extend radially by the mold clamping cylinder 4. Then, the mold opening and closing cylinder 11 drives the outer mold units 2 to merge to form the outer mold. In this way, the locking modules 15 will cooperate with each other. The locking modules 15 are located in the mold clamping groove 14, and the locking inclined surface 16 can effectively guide the locking clamping block, thereby ensuring accurate locking and effectively dispersing the stress during extrusion molding after locking, thus improving the molding effect.

[0037] like Figure 7As shown, the outer mold unit 2 includes an outer mold fixing seat 17, which is radially slidably mounted on the outer mold base 1. An outer mold body 18 is fixed to the inner side of the outer mold fixing seat 17. A quarter-circle outer mold surface 19 is provided on the outer mold body 18. Locking modules 15 are located at both ends of the outer mold body 18. A transmission pin 8 is fixedly mounted on the outer mold fixing seat 17. Guide rollers 22 are vertically fixed on both sides of the transmission pin 8 on the outer mold fixing seat 17. Vertical guide rollers 22 are provided on the outer mold base 1. The roller 22 constrains and engages with the radial strip hole 20 through which the outer mold body 18 slides radially. Then, the outer mold base 1 is provided with a transmission pin 8 that passes through the radially sliding strip hole 21. When the arc-shaped drive strip hole 7 presses the transmission pin 8, the outer mold body 18 slides radially stably. The outer mold fixing seat 17 and the outer mold body 18 are fixedly installed together, which is convenient for production and installation. The outer mold body 18 can also be replaced separately, which improves its practicality. The outer mold body 18 can be effectively formed by the radial sliding of the outer mold fixing seat 17, which is convenient for subsequent removal.

[0038] like Figure 6 and Figure 7 As shown, the cooling device includes a cooling chamber 23 disposed on each outer mold body 18. The outer mold body 18 is provided with a cooling water inlet 24 and a cooling water outlet 25. The cooling water inlet 24 and the cooling water outlet 25 are connected to a cooling water circulation supply device through a hose. Cooling water is input into the cooling chamber 23 through the cooling water inlet 24 by the cooling water circulation supply device and then discharged from the cooling water outlet 25. This effectively circulates and cools the outer mold body 18, thereby effectively forming the socket joint and improving the performance.

[0039] like Figure 6 and Figure 8 As 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 28, and the flange 28 is provided with a plurality of injection holes 29 communicating with the distribution pipe 5. The upstream end face and downstream end face of the upstream inner mold cylinder 26 are also respectively provided with an upstream inner mold ring plate 30 and a downstream connecting ring plate 31. The upstream inner ring plate is slidably mounted on a longitudinal sliding bracket and connected to a reversing valve 109; the downstream inner mold cylinder 27... The diameter is smaller than that of the upstream inner mold cylinder 26. 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. The system is divided into an upstream inner mold cylinder 26 and a downstream inner mold cylinder 27 for convenient production assembly. The upstream inner mold ring plate 30 ensures accurate and stable axial movement of the extrusion inner mold, while 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.

[0040] like Figure 1 and 2 As shown, an upstream support 112 and a downstream support 113 are fixedly installed on the longitudinal slide 111. The extrusion cylinder 102 is fixed on the downstream support 113. The extrusion cylinder 106 is fixed on the upstream support 112, and its piston rod extends into the extrusion cylinder 102. A three-way pipe section 114 is fixed at the downstream end of the extrusion cylinder 102. The reversing valve 109 is connected to the three-way pipe section 114. The screw extruder 107 is also fixed on the upstream support 112. The discharge port 108 of the screw extruder 107 is connected and fixed to the three-way pipe section 114 through a vertical connecting pipe section 115. The longitudinal slide 111 is fixedly equipped with... The fixed plate 116, the upstream support 112 and the downstream support 113 are all fixed on the fixed plate 116, so that the upstream support 112 and the downstream support 113 can slide synchronously in the longitudinal direction. The longitudinal power device includes a longitudinal sliding cylinder 117. One end of the longitudinal sliding cylinder 117 is hinged to the end of the frame 101, and the other end of the longitudinal sliding cylinder 117 is hinged to the longitudinal slide block 111. When the piston rod of the longitudinal sliding cylinder 117 extends or retracts, the longitudinal sliding cylinder 117 can drive the longitudinal slide block 111 to slide, thereby causing the upstream support 112 and the downstream support 113 to slide. The feeding and discharging can be flexibly switched through the reversing valve 109 connected to the three-way pipe section 114, which is simple and convenient to use.

[0041] like Figure 4 and Figure 6 As shown, the longitudinal sliding mechanism includes a fixed support frame 33 fixed on the frame 101. A first guide rod 34 and a second guide rod 35 are provided on the fixed support frame. The first guide rod 34 and the second guide rod 35 are respectively located on both sides of the material distribution joint 3. An inner mold connecting frame 36 is slidably installed on the first guide rod 34 and the second guide rod 35. The inner mold connecting frame 36 is fixedly connected to the upstream inner ring template of the extrusion inner mold. Since the extrusion inner mold moves synchronously when the longitudinal slide block 111 moves, the support of the first guide rod 34 and the second guide rod 35 can ensure the stability of the longitudinal movement of the extrusion inner mold, so that the extrusion inner mold and the outer mold can be accurately matched.

[0042] In this embodiment, the reversing valve 109 includes a valve plate 118 horizontally slidably mounted on the three-way pipe section 114. The valve plate 118 is provided with a connecting hole 119 that connects the inner channel of the three-way pipe section 114. A driving cylinder 120 that drives the valve plate 118 to move horizontally is fixed to the outside of the three-way pipe section 114. The driving cylinder 120 can effectively drive the valve plate 118 to slide, thereby changing the position of the connecting hole 119. The connecting hole 119 can ensure that the material squeezed by the piston rod of the extrusion cylinder 106 into the extrusion cylinder 102 enters the material distribution joint 3 through the connecting hole 119. The switching is flexible and convenient.

[0043] The working principle of this embodiment is as follows: First, the piston rod of the mold opening and closing cylinder 11 retracts, causing the outer mold unit 2 to merge and form the outer mold. The mold locking cylinder 4 drives the clamping block to extend, and the mold locking groove 14 locks the locking module 15. Then, the piston rod of the longitudinal sliding cylinder 117 retracts, driving the inner extrusion mold to slide longitudinally and cooperate with the outer mold to form the mold cavity. Next, the driving cylinder 120 drives the valve plate 118 to slide horizontally and block the channel between the extrusion cylinder 102 and the material distribution joint 3. The screw extruder 107 extrudes material from the discharge port 108 into the extrusion cylinder 102. Then, the driving valve plate 118 slides horizontally to make the extrusion cylinder 102... The material is connected to the material distribution joint 3. The extrusion cylinder 106 pushes the piston to squeeze the material in the extrusion cylinder 102 into the material distribution joint 3, then into the material distribution pipe 5, and finally squeezed out from the injection hole 29 of the inner mold into the mold cavity to complete the injection molding. Finally, the cooling water is introduced into the cooling chamber 23 through the cooling water inlet 24 by the cooling water circulation supply device, and then discharged from the cooling water outlet 25 to cool the socket joint. The mold locking cylinder 4 drives the clamping block to retract, the piston rod of the mold opening and closing cylinder 11 extends to open the outer mold, and at the same time the inner mold of the extrusion retracts to remove the socket joint. Then the above operation is repeated.

[0044] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and alterations made to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. An extrusion machine for composite pipe socket joints, comprising a frame, characterized in that: An extrusion cylinder is fixed on the frame, and the extrusion cylinder has an extrusion cavity. A feed inlet is located at the downstream end of the extrusion cylinder. An extrusion piston, pushed by an extrusion cylinder, is located inside the extrusion cylinder. A screw extruder is fixed on the frame, and the discharge port of the screw extruder is connected to the feed inlet of the extrusion cylinder. A distribution connector is connected downstream of the extrusion cylinder, and a reversing valve is installed between the distribution connector and the extrusion cylinder. The distribution connector has several distribution pipes. A longitudinal guide rail is provided on the frame, and longitudinal slides are mounted on the longitudinal guide rail. The extrusion cylinder and extruder are both fixedly mounted on the longitudinal slide. A longitudinal power unit for driving the longitudinal slide is provided on the frame. An extrusion die is also mounted on the frame. The extrusion die includes a cooperating outer die and an inner die. The outer die includes an outer die base fixed to the frame. Several outer die units are radially slidably mounted on the outer die base. Each outer die unit is driven by an opening and closing drive mechanism fixed to the outer die base. The outer die base also has mechanisms for connecting adjacent outer die units. The machine includes a locking device for body locking; the inner extrusion mold is mounted on the frame via a longitudinal sliding mechanism; the inner extrusion mold and the outer mold unit after mold closing cooperate to form the mold cavity for forming the socket joint; the material distribution pipe is fixed to the inner extrusion mold and communicates with the mold cavity; the outer mold unit is also equipped with a cooling device for cooling the formed socket joint; the mold opening and closing drive mechanism includes a drive ring plate rotatably mounted on the outer mold base; the drive ring plate is located on one side of the outer mold; the drive ring plate is provided with an arc-shaped drive strip hole. The arc-shaped drive bar hole extends outward in an arc shape from the center. Each outer mold unit is provided with a transmission pin that constrains the arc-shaped drive bar hole. The drive ring plate is driven by an opening and closing mold rotation power device. Several constraint wheels are rotatably mounted on the outer mold base. The wheel surface of the constraint wheel is provided with a constraint ring groove. The drive ring plate is circular and its outer contour is constrained within the constraint ring groove of the constraint wheel. The opening and closing mold rotation power device includes an opening and closing mold cylinder with one end hinged to the outer mold base and the other end of the opening and closing mold cylinder hinged to the drive ring plate.

2. The extrusion machine for a composite pipe socket joint as described in claim 1, characterized in that: The mold-locking device includes a mold-locking clamping block with a mold-locking groove. The mold-locking clamping block is fixed to the piston rod of the mold-locking cylinder. The mold-locking cylinder is fixed to the outer mold base and the piston rod slides radially. Each outer mold unit is provided with a locking module. Each locking module has a locking slope on its side. The locking modules on adjacent outer mold units cooperate with each other and are clamped by the locking groove on the locking clamping block.

3. The extrusion machine for a composite pipe socket joint as described in claim 2, characterized in that: The outer mold unit includes an outer mold fixing seat, which is radially slidably mounted on the outer mold base. The outer mold body is fixed to the inner side of the outer mold fixing seat. The outer mold body is provided with a quarter-circle outer mold surface. The locking module is provided at both ends of the outer mold body. The cooling device includes a cooling chamber provided on each outer mold body. The outer mold body is provided with a cooling water inlet and a cooling water outlet. The cooling water inlet and the cooling water outlet are connected to a cooling water circulation supply device through hoses.

4. The extrusion machine for a composite pipe socket joint as described in claim 3, characterized in that: An upstream support and a downstream support are fixedly installed on the longitudinal slide. The injection cylinder is fixed on the downstream support. The injection cylinder is fixed on the upstream support and its piston rod extends into the injection cylinder. A three-way pipe section is fixed at the downstream end of the injection cylinder. The reversing valve is connected to the three-way pipe section. The screw extruder is also fixed on the upstream support. The discharge port of the screw extruder is connected and fixed to the three-way pipe section through a vertical connecting pipe section.

5. The extrusion machine for a composite pipe socket joint as described in claim 4, characterized in that: The longitudinal sliding mechanism includes a fixed support frame fixed on the machine frame. The fixed support frame is provided with a first guide rod and a second guide rod. The first guide rod and the second guide rod are respectively located on both sides of the material distribution joint. An inner mold connecting frame is slidably installed on the first guide rod and the second guide rod. The inner mold connecting frame is fixedly connected to the upstream end face of the extrusion inner mold.

6. The extrusion machine for a composite pipe socket joint as described in claim 5, characterized in that: The reversing valve includes a valve plate that is horizontally slidably mounted on the three-way pipe section. The valve plate is provided with a connecting hole that connects the inner channel of the three-way pipe section. A drive cylinder that drives the valve plate to move horizontally is fixed to the outside of the three-way pipe section.

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