Injection molding machine for PE800 type bell and spigot of HDPE (High-Density Polyethylene) steel strip reinforced pipe

Abstract

The invention discloses a PE800 type bell and spigot injection molding machine for an HDPE (high-density polyethylene) steel belt reinforced pipe, and particularly relates to the technical field of injection molding equipment, the PE800 type bell and spigot injection molding machine comprises a steel belt reinforced pipe body, and further comprises a melting injection molding machine unit and a mold unit, and the mold unit comprises mold closing blocks which are symmetrically arranged; the adjacent sides of the two mold closing blocks are provided with arc-shaped surfaces which are matched to surround the steel belt reinforcing pipe body, and an injection molding cavity is formed between the annular pipes arranged in the two mold closing blocks and the arc-shaped surfaces. According to the bell and spigot injection molding machine provided by the invention, when the melting injection molding machine unit injects molten polyethylene colloid into the injection molding cavity, the pressure in the injection molding cavity is increased to push the high-pressure block to slide, and the high-pressure block slides to drive the piston attaching block to be switched from the first station to the second station; at the moment, the formed vacuum cavity and the inner wall of the side, away from the piston cavity, of the piston attaching block are utilized, so that loss of heat in the injection molding cavity in a short time is reduced, and then polyethylene colloid and polyethylene on the steel belt reinforced pipe body are better and compactly welded.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding equipment, in particular to a PE800 type socket injection molding machine for a HDPE steel strip reinforced pipe. Background Art

[0002] Steel belt reinforced pipe is a composite pipe, mainly composed of inner pipe and outer steel belt reinforced structure, which is designed to improve the pressure bearing capacity and resistance to external forces of the pipe, making it more stable when subjected to high pressure or external impact. Steel belt reinforced pipe has the characteristics of high strength, corrosion resistance, lightness, etc., and is mostly used in the fields of natural gas and water transportation.

[0003] According to patent announcement number CN106426742A, announcement date: 2017-02-22, a winding type steel strip pipe socket equipment is disclosed, including a press and an injection molding machine, the press includes a base, a movable frame is mounted on the base, a mold is arranged on the base, the mold includes a lower mold fixed on the base, an upper mold located directly above the lower mold and movably connected to the movable frame, and a mold core movably connected to the lower mold, a cylindrical hole is opened at the contact position between the upper mold and the lower mold, the hole occupies half on the upper and lower molds respectively, and the mold core moves freely along the axial direction of the hole; the injection molding machine includes an injection table, an injection assembly is arranged on the injection table, and a hydraulic and electrical system for controlling the operation of the injection assembly, and the injection end of the injection assembly is aligned with the injection hole opened on the mold.

[0004] In the prior art including the above patent, for the installation of the socket of the steel belt reinforced pipe, there are methods of using a wrapping device to heat and wrap PE melting tape and heat shrink tape on both ends of the produced steel belt pipe, and then using a lathe to process the required shape, and also including the use of injection molding equipment to produce and process the socket in the above patent. Although the use of injection molding equipment can achieve injection molding to achieve a one-time molding effect, the injection mold in the injection molding equipment itself will quickly absorb the heat of the molten polyethylene glue when in use, and when these glues dissipate heat too quickly, it will lead to poor welding with the steel belt reinforced pipe itself, thereby affecting the connection effect between the socket and the steel belt reinforced pipe. Summary of the invention

[0005] The purpose of the present invention is to provide a PE800 type socket injection molding machine for HDPE steel strip reinforced pipe to solve the above technical problems.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a PE800 type socket injection molding machine for HDPE steel belt reinforced pipe, comprising a steel belt reinforced pipe body, a melt injection molding machine unit and a mold unit, wherein the mold unit comprises symmetrically arranged closing modules, and two adjacent closing modules are provided with arc surfaces for embracing the steel belt reinforced pipe body, an injection cavity is formed between the annular tubes and the arc surfaces provided in the two closing modules, a piston block is movably provided in the piston cavity opened in the closing module, and the piston block is assembled for switching between the following two stations:

[0007] Station 1, the piston sticking block is attached to the inner wall of one side of the piston cavity;

[0008] Station 2, the piston block is away from the inner wall of the piston cavity to form a vacuum cavity;

[0009] Wherein, the high-pressure block arranged on the inner wall of one side of the arc-shaped surface slides when the injection pressure in the injection cavity increases, and when the high-pressure block slides, the piston block switches from station one to station two.

[0010] Preferably, the high-pressure block is slidably disposed in an extrusion cavity provided in the combination module, and a gas lift rod disposed on the piston block moves on an inner wall on one side of the extrusion cavity.

[0011] Preferably, a fine hole for relieving pressure in the extrusion chamber is provided in a slide rod fixedly mounted on the high-pressure block.

[0012] Preferably, a locking rod is provided on the module, and a locking block is slidably provided on one end of the sliding rod relative to the high-pressure block. When the high-pressure block squeezes the extrusion cavity, the locking block passes through the locking groove on the locking rod to lock on the locking rod.

[0013] Preferably, the melt injection molding machine unit includes an end rod inserted into an injection port opened on the closing module, and a locking rod is slidably arranged on the closing module, when the end rod is inserted into the injection port, the first end of the locking rod is squeezed, and the locking rod slides and a force storage spring fixedly installed at the second end thereof is deformed and stores force, when the end rod is separated from the injection port, the force storage spring releases the stored force, and the sliding rod is separated from the locking rod.

[0014] Preferably, a sealing flap for shielding and closing the extrusion cavity is fixedly mounted on the inner wall of the injection port.

[0015] Preferably, the sealing flap is located on the moving path of the high-pressure block, and when the high-pressure block slides to compress the extrusion cavity, the high-pressure block is close to the sealing flap.

[0016] Preferably, a cavity portion is provided in the sealing petal, and an annular sealing ring is fixedly installed on the conical surface provided at the end of the end rod. When the high-pressure block slides to compress the extrusion cavity and locks the locking block on the locking rod, the high-pressure block squeezes the cavity portion and embeds the cavity portion into the annular groove opened on the outer wall of the annular sealing ring.

[0017] Preferably, the annular sealing ring is provided with a raised portion on one side of the annular groove, and the sealing petal is provided with an inflation portion covering the extrusion cavity, and when the high-pressure block slides to compress the extrusion cavity and squeezes the hollow portion, the inflation portion expands to squeeze the raised portion and limit the end rod.

[0018] Preferably, when the air pressure in the extrusion chamber decreases, the inflation portion recovers its deformation to release the limiting end rod.

[0019] In the above technical scheme, the present invention provides a HDPE steel belt reinforced pipe PE800 type socket injection molding machine, which has the following beneficial effects: by placing the steel belt reinforced pipe body between two closing modules, and then when the molten polyethylene colloid is injected into the injection cavity by the molten injection molding machine unit, the pressure in the injection cavity increases to push the high-pressure block to slide, and then the high-pressure block slides to drive the piston block to switch from station one to station two. At this time, the formed vacuum cavity and the inner wall of the piston block away from the side of the piston cavity are utilized to reduce the heat loss in the injection cavity in a short time, thereby making the polyethylene colloid and the polyethylene on the steel belt reinforced pipe body better and more densely welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the mold unit structure provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the overall cross-sectional structure provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the cross-sectional structure of the end rod during injection provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of the steel strip reinforced pipe body before processing provided by an embodiment of the present invention;

[0026] Figure 6A schematic diagram of the structure of a portion of a steel strip reinforced pipe body after processing provided by an embodiment of the present invention;

[0027] Figure 7 The embodiment of the present invention provides Figure 3 The enlarged structural diagram at A in the middle;

[0028] Figure 8 The embodiment of the present invention provides Figure 7 The enlarged structural diagram at B in the middle;

[0029] Fig. 9 The embodiment of the present invention provides Figure 7 The enlarged structural diagram at C in the middle;

[0030] Fig.10 The embodiment of the present invention provides Figure 4 The enlarged structural diagram at D in the middle;

[0031] Fig.11 The embodiment of the present invention provides Fig.10 The enlarged structural diagram at E in the middle;

[0032] Fig.12 The embodiment of the present invention provides Fig.10 The enlarged structural diagram at F in the middle;

[0033] Fig.13 The embodiment of the present invention provides Fig.11 The enlarged structural diagram at G in the middle;

[0034] Fig.14 The embodiment of the present invention provides Fig.11 The enlarged structural diagram at H in the middle;

[0035] Fig.15 A schematic diagram of a combined module structure provided in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. Base; 2. End rod; 3. Support platform; 4. Combination module; 5. L-shaped vertical plate; 6. High-pressure block; 7. Locking rod; 8. Sealing flap; 11. Slide; 12. Feeder; 13. Sol channel; 14. Conversion valve; 15. Storage pipe; 16. Push block; 17. First hydraulic cylinder; 18. Hydraulic motor; 19. Second hydraulic cylinder; 21. Annular sealing ring; 22. Annular groove; 23. Raised part; 31. Guide rod; 32. Top platform; 33. Third hydraulic cylinder; 34. Moving platform; 35. Steel belt reinforced pipe body; 36. Main socket; 37. Corrugation; 41. Arc surface; 42. Piston cavity; 43. Heat dissipation port; 44. Injection molding cavity; 45, vacuum cavity; 46, limit groove; 47, injection port; 48, extrusion cavity; 49, embedding groove; 51, fourth hydraulic cylinder; 52, sealing plate; 53, annular tube; 54, piston sticker; 55, heat dissipation fin plate; 56, first sealing rubber ring; 57, side plate; 58, pulling spring; 59, air lift rod; 61, second sealing rubber ring; 62, inclined portion; 63, second spring; 64, third sealing rubber ring; 65, sliding rod; 66, fine hole; 67, locking block; 68, first spring; 69, first curved portion; 71, storage spring; 72, locking groove; 73, second curved portion; 81, cavity portion; 82, inflation portion. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 1-15 As shown, a PE800 type socket injection molding machine for HDPE steel belt reinforced pipe includes a steel belt reinforced pipe body 35, a melt injection molding machine unit and a mold unit, the mold unit includes symmetrically arranged closing modules 4, and two adjacent sides of the closing modules 4 are provided with arcuate surfaces 41 for embracing the steel belt reinforced pipe body 35, an injection cavity 44 is formed between the annular tube 53 and the arcuate surface 41 provided in the two closing modules 4, a piston block 54 is movably provided in the piston cavity 42 opened in the closing module 4, and the piston block 54 is assembled for switching between the following two stations:

[0040] Station 1, the piston abutment block 54 is abutted against the inner wall of one side of the piston chamber 42;

[0041] Station 2, the piston block 54 is away from the inner wall of the piston cavity 42 to form a vacuum cavity 45;

[0042] The high pressure block 6 disposed on the inner wall of one side of the arc surface 41 slides when the injection pressure in the injection cavity 44 increases, and when the high pressure block 6 slides, the piston block 54 switches from station one to station two.

[0043] Specifically, the melt injection molding machine unit also includes a base 1 and a slide 11 sliding on the top of the base 1, a feeder 12 for melting polyethylene particles is fixedly installed on the top of the slide 11, and a storage pipe 15 for storing molten polyethylene colloid is fixedly installed on one side of the slide 11, and a sol channel 13 is fixedly connected between the storage pipe 15 and the feeder 12, a hydraulic motor 18 for driving the screw in the feeder 12 is fixedly installed on the slide 11, and a hydraulic motor 18 for driving the screw in the feeder 12 is slidably arranged in the storage pipe 15 The push block 16 and the slide 11 are fixed with a first hydraulic cylinder 17, and the output end of the first hydraulic cylinder 17 is fixedly mounted on the push block 16. The storage tube 15 is fixedly connected with an end rod 2, and a conversion valve 14 is arranged at the connection between the end rod 2, the storage tube 15 and the sol channel 13. The second hydraulic cylinder 19 is fixedly mounted on the base 1, and the output end of the second hydraulic cylinder 19 is fixedly mounted on the slide 11. The two combination modules 4 are respectively provided with injection ports 47 connected to the injection cavity 44. The feeder 12 and the storage tube 15 are connected by using the conversion valve 14, so that the polyethylene colloid extruded by the screw in the feeder 12 enters the storage tube 15 along the sol channel 13 for storage. The conversion valve 14 can be an electric three-way valve, and the outer wall of the piston block 54 is provided with a first sealing rubber ring 56 for sealing, and the outer wall of the high-pressure block 6 is provided with a second sealing rubber ring 61 for sealing.

[0044] Furthermore, the mold unit also includes a support platform 3 and a plurality of guide rod members 31 fixedly installed on the top of the support platform 3, a top platform 32 is fixedly installed on the plurality of guide rod members 31, and a moving platform 34 sliding on the plurality of guide rod members 31 is arranged between the top platform 32 and the support platform 3, one of the closing modules 4 is fixedly installed on the bottom of the moving platform 34, and another closing module 4 is fixedly installed on the top of the support platform 3, a third hydraulic cylinder 33 is fixedly installed on the top platform 32, and an output end of the third hydraulic cylinder 33 is fixedly installed on the moving platform 34, an L-shaped vertical plate 5 is fixedly installed on the top of the support platform 3, and a closing plate 52 is slidably arranged on the L-shaped vertical plate 5, a fourth hydraulic cylinder 51 is fixedly installed on the L-shaped vertical plate 5, and an annular tube 53 is fixedly installed on the closing plate 52.

[0045] Furthermore, by placing the steel strip reinforced pipe body 35 in the arc surface 41 between the two closing modules 4, as shown in FIG. Fig.15The two closing modules 4 are provided with an embedding groove 49 matching the corrugation 37 arranged on the outer wall of the steel strip reinforced pipe body 35. The steel strip reinforced pipe body 35 is placed on the closing module 4 on the support platform 3, and then the third hydraulic cylinder 33 pushes the moving platform 34 downward to make the closing module 4 on the moving platform 34 close to the closing module 4 on the support platform 3, and then the two closing modules 4 are molded to clamp the steel strip reinforced pipe body 35. The fourth hydraulic cylinder 51 is used to push the sealing plate 52 to make the ring tube 53 inserted into the steel strip reinforced pipe body 35, and at the same time, the sealing plate 52 closes the first end of the injection cavity 44. Since the corrugation 37 is inserted into the embedding groove 49, the two closing modules 4 cooperate to squeeze the steel strip reinforced pipe body 35 to close the second end of the injection cavity 44.

[0046] Furthermore, by utilizing the second hydraulic cylinder 19 to pull the slide 11 so that the port of the end rod 2 is inserted into the injection port 47, and then controlling the conversion valve 14 to connect the storage pipe 15 and the end rod 2, at this time, the first hydraulic cylinder 17 is utilized to push the push block 16 to squeeze the polyethylene colloid in the storage pipe 15 into the injection cavity 44 along the end rod 2, and the main socket 36 is formed by extrusion molding, and the polyethylene colloid is quickly squeezed into the injection cavity 44 by utilizing the first hydraulic cylinder 17, which can reduce the heat loss of the polyethylene colloid, and then utilize the heat of the polyethylene colloid and the steel belt reinforced pipe body 35 to produce a better welding effect.

[0047] Furthermore, since the high-pressure block 6 slides on the inner wall of one side of the arc surface 41, when the end rod 2 injects polyethylene colloid into the injection cavity 44, the pressure in the injection cavity 44 increases, and the high-pressure block 6 is pushed by the pressure to slide as the pressure in the injection cavity 44 increases, and the sliding of the high-pressure block 6 drives the piston block 54 to switch from station 1 to station 2, and then the piston block 54 switches from the state of being attached to the inner wall of one side of the piston cavity 42 to the inner wall away from the side of the piston cavity 42 to form a vacuum cavity 45. At this time, the formed vacuum cavity 45 and the inner wall of the piston block 54 away from the side of the piston cavity 42 are used to reduce the heat loss in the injection cavity 44 in a short time. Therefore, the heat of the polyethylene colloid injected into the injection cavity 44 can act more on the steel belt reinforced tube body 35, so that the heat of the molten polyethylene colloid is fully used to fully and densely fuse the polyethylene colloid with the polyethylene on the steel belt reinforced tube body 35.

[0048] The sliding of the high-pressure block 6 to drive the piston block 54 to switch from station one to station two can be achieved by setting a connecting rod between the high-pressure block 6 and the piston block 54 so that the piston block 54 can be driven to slide when the high-pressure block 6 slides; or a compression chamber that is respectively connected to the high-pressure block 6 and the piston block 54 is set in the combination module 4, and when the high-pressure block 6 slides and squeezes the compression chamber, the pressure in the compression chamber increases, thereby pushing the piston block 54 to slide; or any other method known to those skilled in the art that the high-pressure block 6 slides to drive the piston block 54 to slide.

[0049] In the above technical solution, the steel belt reinforced tube body 35 is placed between two assembly modules 4, and then when the molten polyethylene colloid is injected into the injection cavity 44 by the molten injection molding machine unit, the pressure in the injection cavity 44 increases to push the high-pressure block 6 to slide, and then the high-pressure block 6 slides to drive the piston block 54 to switch from station one to station two. At this time, the formed vacuum cavity 45 and the inner wall of the piston block 54 away from the piston cavity 42 are utilized to reduce the heat loss in the injection cavity 44 in a short time, thereby making the polyethylene colloid and the polyethylene on the steel belt reinforced tube body 35 better and densely welded.

[0050] As an embodiment further provided by the present invention, the high pressure block 6 is slidably disposed in the extrusion chamber 48 opened in the closing module 4 , and the gas lift rod 59 disposed on the piston block 54 moves on the inner wall of one side of the extrusion chamber 48 .

[0051] Specifically, a side plate 57 is fixedly mounted on the piston block 54, and the side plate 57 slides in the limit groove 46 provided in the closing module 4, and a gas lift rod 59 is fixedly mounted on the side plate 57, and a third sealing rubber ring 64 for sealing is sleeved on the outer wall of the gas lift rod 59. A pulling spring 58 is fixedly mounted on the side plate 57, and a first end of the pulling spring 58 is fixedly mounted on the closing module 4.

[0052] Furthermore, when the steel belt reinforced tube body 35 is placed between the two closing modules 4 and the molten injection molding machine unit injects molten polyethylene colloid into the injection cavity 44, the pressure in the injection cavity 44 increases to push the high-pressure block 6 to slide. At this time, the high-pressure block 6 slides to compress the extrusion cavity 48, and then the pressure in the extrusion cavity 48 increases. At this time, the gas push rod 59 located on the inner wall of one side of the extrusion cavity 48 is pushed to slide by the gas pressure, and then the gas push rod 59 drives the piston block 54 to slide so that the piston block 54 switches from the state of being attached to the inner wall of one side of the piston cavity 42 to the inner wall away from the side of the piston cavity 42 to form a vacuum cavity 45, and the pulling spring 58 deforms and accumulates force.

[0053] Therefore, the increase in pressure in the injection cavity 44 is used to drive the high-pressure block 6 to slide, thereby cooperating with the high-pressure block 6 to squeeze the extrusion cavity 48 so that the piston block 54 slides to form a vacuum cavity 45, thereby forming a heat-insulating layer to reduce the heat loss of the closing module 4 in a short period of time. By relieving the pressure in the extrusion cavity 48, the extrusion cavity 48 can be restored to a normal pressure, thereby cooperating with the pulling spring 58 to release the stored force to pull the piston block 54 to switch from station 2 to station 1. At this time, the piston block 54 is attached to the inner wall of one side of the piston cavity 42, and then the piston block 54 is used to quickly absorb the heat of the closing module 4 near the injection cavity 44 side, thereby accelerating the heat dissipation of the closing module 4, thereby improving the cooling speed of the injection socket.

[0054] The pressure relief method in the extrusion chamber 48 may be a manual control valve; it may also be controlled by an electronic valve; or any other method known to those skilled in the art to control the pressure relief in the extrusion chamber 48 may be used.

[0055] As another embodiment provided by the present invention, a fine hole 66 for relieving pressure in the extrusion chamber 48 is provided in a slide bar 65 fixedly mounted on the high-pressure block 6 .

[0056] Specifically, the first end of the fine channel 66 is connected to the extrusion chamber 48, and the second end of the fine channel 66 is connected to the air outside the module 4. After the molten polyethylene colloid is injected into the injection chamber 44 by the molten injection molding machine unit, the pressure in the injection chamber 44 increases to push the high-pressure block 6 to slide. At this time, the high-pressure block 6 slides to compress the extrusion chamber 48. At this time, the compressed gas in the extrusion chamber 48 is discharged from the extrusion chamber 48 along the fine channel 66, and the gas that can be discharged from the fine channel 66 is limited. At this time, the high-pressure block 6 compresses the extrusion chamber 48 in a short time to increase the pressure in the extrusion chamber 48 rapidly. At this time, the gas push rod 59 located on the inner wall of one side of the extrusion chamber 48 is pushed to slide by the gas pressure, and then the gas push rod 59 drives the piston block 54 to slide so that the piston block 54 switches from station one to station two and forms a vacuum chamber 45. Then, after the fine channel 66 is slowly and automatically deflated, the piston block 54 automatically switches from station two to station one, thereby dissipating heat and cooling the socket in the injection chamber 44 after the injection is completed.

[0057] As another embodiment provided by the present invention, a locking rod 7 is provided on the closing module 4, and a locking block 67 is provided on one end of the sliding rod 65 which slides relative to the high-pressure block 6. When the high-pressure block 6 squeezes the extrusion cavity 48, the locking block 67 passes through the locking groove 72 provided on the locking rod 7 to be locked on the locking rod 7.

[0058] Specifically, the locking rod 7 is slidably arranged on the closing module 4, and the first end of the locking block 67 is fixedly installed with a first spring 68, the first end of the first spring 68 is fixedly installed on the sliding rod 65, the second end of the locking block 67 is provided with a first curved portion 69, the high-pressure block 6 is fixedly installed with a second spring 63, and the first end of the second spring 63 is fixedly installed on the closing module 4.

[0059] After the molten injection molding machine unit injects molten polyethylene colloid into the injection cavity 44, the pressure in the injection cavity 44 increases to push the high-pressure block 6 to slide. At this time, the high-pressure block 6 slides to compress the extrusion cavity 48, and then the pressure in the extrusion cavity 48 increases. At this time, the gas push rod 59 located on the inner wall of one side of the extrusion cavity 48 is pushed to slide by the gas pressure, and then the gas push rod 59 drives the piston block 54 to slide so that the piston block 54 switches from the state of being in contact with the inner wall of one side of the piston cavity 42 to the inner wall away from the side of the piston cavity 42 to form a vacuum cavity 45.

[0060] Furthermore, the second spring 63 is squeezed by the high-pressure block 6 to deform and accumulate force, and at the same time, the sliding rod 65 moves with the high-pressure block 6 to make the locking block 67 approach the locking rod 7, and then the first curved surface 69 on the locking block 67 and the inner wall on one side of the locking groove 72 are squeezed to make the locking block 67 slide, and the first spring 68 is squeezed and accumulates force, and then as the sliding rod 65 continues to slide, the locking block 67 passes through the locking groove 72, at this time, the locking block 67 is pushed under the release of the accumulated force of the first spring 68 so that the locking block 67 is limited by the locking rod 7, at this time, as the compressed gas in the extrusion chamber 48 is discharged from the extrusion chamber 48 along the fine channel 66, the high-pressure block 6 remains stationary, and then after the injection is completed in the injection cavity 44 and the socket is cooled, and the two closing modules 4 move away from each other to open the injection cavity 44, the locking rod 7 is driven to move so that the locking rod 7 releases the blocking of the locking block 67, and at this time, the second spring 63 releases the accumulated force to reset the high-pressure block 6. If the locking rod 7 is not used to lock the high-pressure block 6, after the pressure in the injection cavity 44 is reduced, the second spring 63 releases the stored force, which will cause the high-pressure block 6 to squeeze the injection-molded socket, and then cause the socket to have an indentation of the high-pressure block 6, thereby affecting the production quality of the socket. The locking of the locking rod 7 and the elasticity of the second spring 63 can achieve the effect of locking and quickly resetting the high-pressure block 6.

[0061] The locking rod 7 can be slidable by manual manipulation, by an electric push rod, or by any other method known to those skilled in the art to control the sliding of the locking rod 7.

[0062] As another embodiment provided by the present invention, the melt injection molding machine unit includes an end rod 2 inserted into an injection port 47 opened on the closing module 4, and a locking rod 7 is slidably arranged on the closing module 4. When the end rod 2 is inserted into the injection port 47, the first end of the locking rod 7 is squeezed, and the locking rod 7 slides and a force storage spring 71 fixedly installed at its second end is deformed and stored force. When the end rod 2 is separated from the injection port 47, the force storage spring 71 releases the stored force, and the sliding rod 65 is separated from the locking rod 7.

[0063] Specifically, the first end of the force storage spring 71 is fixedly mounted on the two closing modules 4, and the first end of the locking rod 7 is provided with a second curved portion 73. When the steel belt reinforced pipe body 35 is placed between the two closing modules 4 and the two closing modules 4 are closed, the end of the end rod 2 is inserted into the injection port 47 on the closing module 4. At this time, the end of the end rod 2 squeezes the second curved portion 73 and causes the force storage spring 71 to deform and store force. Then, after the end rod 2 is used to inject molten polyethylene colloid into the injection cavity 44, the pressure in the injection cavity 44 increases to push the The high-pressure block 6 slides, and at this time the high-pressure block 6 slides to compress the extrusion chamber 48. At the same time, the sliding rod 65 moves with the high-pressure block 6 to make the locking block 67 close to the locking rod 7, and then the first curved surface 69 on the locking block 67 and the inner wall on one side of the locking groove 72 produce extrusion to make the locking block 67 slide, and the first spring 68 is squeezed and accumulates force, and then as the sliding rod 65 continues to slide to make the locking block 67 pass through the locking groove 72, at this time, the locking block 67 is pushed under the release of the accumulated force of the first spring 68 so that the locking block 67 is limited by the locking rod 7. After the molten polyethylene colloid injected into the injection cavity 44 is cooled and formed, the end of the end rod 2 is removed from the injection port 47 to release the extrusion on the second curved surface 73. At this time, the force storage spring 71 releases the stored force to push the locking rod 7 to reset. At this time, the locking rod 7 releases the locking limit on the locking block 67. Therefore, after the steel belt reinforced pipe body 35 is removed from the two assembly modules 4, the second spring 63 releases the stored force to reset the high-pressure block 6.

[0064] Therefore, the end rod 2 is used to limit and release the extrusion of the locking rod 7, so as to achieve the locking and unlocking of the high-pressure block 6, so that the high-pressure block 6 can slide and lock after the molten polyethylene colloid is injected into the injection cavity 44, so as to avoid the high-pressure block 6 from resetting to the socket of the extrusion injection molding due to the pressure reduction in the injection cavity 44.

[0065] As the best embodiment provided by the present invention, a sealing flap 8 for shielding and closing the extrusion cavity 48 is fixedly installed on the inner wall of the injection port 47 .

[0066] Specifically, when the steel strip reinforced tube body 35 is placed on the closing module 4, and then after the two closing modules 4 close the mold and clamp the steel strip reinforced tube body 35, the sealing petals 8 on the two closing modules 4 fit together to form a funnel shape, and then when the end rod 2 is inserted into the injection port 47, the two sealing petals 8 are used to seal between the end rod 2 and the inner wall of the injection port 47. After the end rod 2 injects molten polyethylene colloid into the injection cavity 44, as the pressure in the injection cavity 44 increases to push the high-pressure block 6 to slide, the high-pressure block 6 slides to compress the extrusion cavity 48, the pressure in the extrusion cavity 48 increases, and the sealing flap 8 blocks and closes the extrusion cavity 48, so the sealing flap 8 will expand to a certain extent and squeeze the outer wall of the end rod 2. Therefore, as the pressure in the injection cavity 44 increases after injection, the high-pressure block 6 squeezes the extrusion cavity 48 to increase the pressure in the extrusion cavity 48. Therefore, the greater the pressure in the injection cavity 44, the greater the pressure in the extrusion cavity 48 within the pressure range, and the greater the squeezing force of the sealing flap 8 on the end rod 2, thereby utilizing the expansion of the sealing flap 8 to enhance the sealing between the end rod 2 and the inner wall of the injection port 47.

[0067] As another embodiment provided by the present invention, the sealing flap 8 is located on the moving path of the high-pressure block 6 , and when the high-pressure block 6 slides to compress the extrusion cavity 48 , the high-pressure block 6 is close to the sealing flap 8 .

[0068] Specifically, a bevel portion 62 is provided on the high-pressure block 6. When the end rod 2 is inserted into the injection port 47 and molten polyethylene colloid is injected into the injection cavity 44, as the pressure in the injection cavity 44 increases to push the high-pressure block 6 to slide, the high-pressure block 6 slides to compress the extrusion cavity 48. The pressure in the extrusion cavity 48 increases, and the sealing flap 8 blocks and closes the extrusion cavity 48. Therefore, the sealing flap 8 will expand to a certain extent and squeeze the outer wall of the end rod 2. At the same time, as the high-pressure block 6 slides, the bevel portion 62 provided on the high-pressure block 6 begins to gradually squeeze the sealing flap 8. Therefore, the increased pressure in the extrusion cavity 48 is used to drive the sealing flap 8 to expand, and the bevel portion 62 on the high-pressure block 6 squeezes the sealing flap 8, so that the sealing flap 8 fits more closely to the end rod 2, thereby further improving the sealing effect between the end rod 2 and the inner wall of the injection port 47.

[0069] As another embodiment provided by the present invention, a cavity portion 81 is provided in the sealing petal 8, and an annular sealing ring 21 is fixedly installed on the conical surface provided at the end of the end rod 2. When the high-pressure block 6 slides to compress the extrusion cavity 48 and locks the locking block 67 on the locking rod 7, the high-pressure block 6 squeezes the cavity portion 81 and embeds the cavity portion 81 into the annular groove 22 opened on the outer wall of the annular sealing ring 21.

[0070] Specifically, Fig.11As shown, when the end rod 2 is inserted into the injection port 47 and molten polyethylene colloid is injected into the injection cavity 44, as the pressure in the injection cavity 44 increases to push the high-pressure block 6 to slide, the high-pressure block 6 slides to compress the extrusion cavity 48, the pressure in the extrusion cavity 48 increases, and the sealing flap 8 blocks and closes the extrusion cavity 48, so the sealing flap 8 will expand to a certain extent and squeeze the outer wall of the end rod 2. At the same time, as the high-pressure block 6 slides, the inclined portion 62 set on the high-pressure block 6 begins to gradually squeeze the sealing flap 8, and when the high-pressure block 6 moves to lock the locking block 67 on the locking rod 7, the inclined portion 62 on the high-pressure block 6 squeezes the cavity portion 81, as shown in FIG. Fig.13 As shown, since the cavity portion 81 is squeezed, the cavity portion 81 begins to be squeezed and embedded into the annular groove 22 on the annular sealing ring 21, and the concave-convex fit between the cavity portion 81 and the annular groove 22 further enhances the sealing effect between the sealing petal 8 and the annular sealing ring 21, thereby reducing the problem of part of the injected glue flowing out along the injection port 47 due to the increased pressure in the injection cavity 44, thereby improving the fit and sealing effect between the end rod 2 and the module 4.

[0071] As another embodiment further provided by the present invention, the annular sealing ring 21 is provided with a protrusion 23 on one side of the annular groove 22, and the sealing petal 8 is provided with an inflation portion 82 covering the extrusion cavity 48. When the high-pressure block 6 slides to compress the extrusion cavity 48 and squeezes the cavity portion 81, the inflation portion 82 expands to squeeze the protrusion 23 and limit the end rod 2.

[0072] Specifically, Figure 8 and Fig.13 As shown, there is an inner groove on the sealing flap 8 between the cavity portion 81 and the inflation portion 82. When the steel strip reinforced tube body 35 is placed on the clamping module 4, and then the two clamping modules 4 clamp the steel strip reinforced tube body 35, the sealing flaps 8 on the two clamping modules 4 fit each other to form a funnel shape, and then when the end rod 2 is inserted into the injection port 47, the annular sealing ring 21 on the end rod 2 begins to fit on the sealing flap 8, and the protrusion 23 fits in the inner groove, and the cavity portion 81 is located on one side of the annular groove 22. Then, after the end rod 2 injects molten polyethylene colloid into the injection cavity 44, as the pressure in the injection cavity 44 increases to push the high-pressure block 6 to slide, the high-pressure block 6 slides to compress the extrusion cavity 48, and the pressure in the extrusion cavity 48 increases. The high-pressure gas in the extrusion cavity 48 drives the inflation portion 82 on the sealing flap 8 to expand to a certain extent and squeeze onto the protrusion 23. At the same time, as the high-pressure block 6 slides, the inclined portion 62 provided on the high-pressure block 6 begins to gradually squeeze the sealing flap 8. When the high-pressure block 6 moves to lock the locking block 67 on the locking rod 7, the inclined portion 62 on the high-pressure block 6 squeezes the cavity portion 81. Fig.13As shown, since the cavity portion 81 is squeezed, the cavity portion 81 begins to be squeezed and embedded into the annular groove 22 on the annular sealing ring 21. Since the protrusion 23 is located on one side of the annular groove 22, when the cavity portion 81 is squeezed and expanded into the annular groove 22, the protrusion 23 is subjected to the squeezing force of the cavity portion 81. The squeezing force generated by the inflation portion 82 on the protrusion 23 and the squeezing force generated by the cavity portion 81 on the protrusion 23 both act on the protrusion 23, and the protrusion 23 fits in the inner groove, thereby further increasing the tightness between the cavity portion 81, the inflation portion 82 and the protrusion 23. Therefore, as the pressure in the injection cavity 44 increases after injection molding, the tightness between the annular sealing ring 21 and the sealing petal 8 is further enhanced, thereby further improving the sealing effect between the end rod 2 and the closing module 4.

[0073] like Fig.13 As shown, at this time, the inflation portion 82 expands toward the side of the protrusion 23, so that the inflation portion 82 also limits the end rod 2 to a certain extent.

[0074] As a further optimal embodiment of the present invention, when the air pressure in the extrusion chamber 48 decreases, the inflation portion 82 recovers its deformation to release the limit end rod 2.

[0075] Specifically, the steel strip reinforced pipe body 35 is placed in the arc surface 41 between the two closing modules 4, and then the steel strip reinforced pipe body 35 is located on the closing module 4 on the support platform 3, and the third hydraulic cylinder 33 pushes the moving platform 34 downward to make the closing module 4 on the moving platform 34 close to the closing module 4 on the support platform 3, and then the two closing modules 4 are closed to clamp the steel strip reinforced pipe body 35. The fourth hydraulic cylinder 51 is used to push the sealing plate 52 to make the ring tube 53 inserted into the steel strip reinforced pipe body 35, and the sealing plate 52 closes the first end of the injection cavity 44 at the same time. Since the corrugation 37 is inserted into the embedding groove 49, the two closing modules 4 cooperate to squeeze the steel strip reinforced pipe body 35 to close the second end of the injection cavity 44.

[0076] Furthermore, by utilizing the second hydraulic cylinder 19 to pull the slide 11 so that the end of the end rod 2 is inserted into the injection port 47 , the annular sealing ring 21 on the end rod 2 begins to fit onto the sealing flap 8 , and the raised portion 23 fits into the inner groove, and the cavity portion 81 is located on one side of the annular groove 22 . Then the conversion valve 14 is controlled to connect the material storage pipe 15 and the end rod 2. At this time, the first hydraulic cylinder 17 is used to push the push block 16 to squeeze the polyethylene colloid in the material storage pipe 15 into the injection cavity 44 along the end rod 2. When the end rod 2 injects the polyethylene colloid into the injection cavity 44, the pressure in the injection cavity 44 increases. As the pressure in the injection cavity 44 increases, the high-pressure block 6 is pushed by the pressure to slide and squeeze the extrusion cavity 48. Then the pressure in the extrusion cavity 48 increases. At this time, the gas push rod 59 located on the inner wall of one side of the extrusion cavity 48 is pushed by the gas pressure to slide, and then the gas push rod 59 drives the piston block 54 to slide so that the piston block 54 switches from the state of being in contact with the inner wall of one side of the piston cavity 42 to the inner wall away from the side of the piston cavity 42 to form a vacuum cavity 45, and the pulling spring 58 deforms and accumulates force. By utilizing the vacuum chamber 45 , a heat-insulating layer is formed to reduce the heat loss in the injection chamber 44 in a short period of time, thereby enabling the polyethylene colloid to be more tightly welded with the polyethylene on the steel-belt reinforced pipe body 35 .

[0077] When the high-pressure block 6 squeezes the extrusion cavity 48, the inclined portion 62 provided on the high-pressure block 6 begins to gradually squeeze the sealing flap 8. When the high-pressure block 6 moves to lock the locking block 67 on the locking rod 7, the inclined portion 62 on the high-pressure block 6 squeezes the cavity portion 81. Fig.13 As shown, as the cavity portion 81 is squeezed, the cavity portion 81 begins to be squeezed and embedded into the annular groove 22 on the annular sealing ring 21. Since the protrusion 23 is located on one side of the annular groove 22, when the cavity portion 81 is squeezed and expanded into the annular groove 22, the protrusion 23 is squeezed by the cavity portion 81. Since the side plate 57 moves into the limiting groove 46 and is limited by the limiting groove 46, the cavity volume formed by the vacuum chamber 45 is fixed. As the air lift rod 59 is limited and remains stationary, the increased pressure in the extrusion chamber 48 acts on the inflation portion 82. Thereby, the inflation portion 82 expands and generates an extrusion pressure on the protrusion 23, and the extrusion pressure generated by the inflation portion 82 and the cavity portion 81 on the protrusion 23 both acts on the protrusion 23, and the protrusion 23 fits in the inner groove, thereby further increasing the tightness between the cavity portion 81, the inflation portion 82 and the protrusion 23. Therefore, as the pressure in the injection cavity 44 increases after injection molding, the fit tightness between the annular sealing ring 21 and the sealing petal 8 is further enhanced, thereby further improving the sealing effect between the end rod 2 and the module 4.

[0078] As the gas in the extrusion chamber 48 is discharged from the extrusion chamber 48 along the fine channel 66, the piston block 54 automatically switches from the second station to the first station after the fine channel 66 is slowly and automatically deflated. At this time, the piston block 54 is again attached to the inner wall of one side of the piston chamber 42. Figure 7 As shown, the heat dissipation port 43 connected to the piston cavity 42 and the heat dissipation fins 55 on the piston block 54 are used to dissipate the heat absorbed by the piston block 54 along the heat dissipation fins 55 and the heat dissipation port 43 is used to accelerate the heat dissipation of the heat dissipation fins 55, thereby achieving the purpose of heat dissipation and cooling of the socket after injection. As the pressure in the extrusion cavity 48 decreases, the inflation portion 82 recovers its deformation to gradually reduce the force of the extrusion protrusion 23, and at the same time releases the limit of the end rod 2.

[0079] Therefore, the change of the two positions when the piston block 54 injects the polyethylene colloid into the injection cavity 44 can not only play the role of heat preservation when the injection is just started, but also play the role of heat dissipation after the injection is completed. With the movement of the high-pressure block 6 and the increase and decrease of the pressure in the extrusion cavity 48, the sealing effect between the end rod 2 and the closing module 4 is improved during the injection of the end rod 2. Then, after the socket is finalized, the end of the end rod 2 is removed from the injection port 47, thereby releasing the extrusion of the second curved surface 73. At this time, the force storage spring 71 releases the stored force to push the locking rod 7 to reset. At this time, the locking rod 7 releases the locking limit of the locking block 67, so that after the steel belt reinforced pipe body 35 is removed from the two closing modules 4, the second spring 63 releases the stored force to reset the high-pressure block 6.

[0080] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A PE800 type socket injection molding machine for a HDPE steel-reinforced pipe, comprising a steel-reinforced pipe body (35), characterized in that: The invention also comprises a melt injection molding machine unit and a mold unit, wherein the mold unit comprises symmetrically arranged closing modules (4), and an arcuate surface (41) is arranged on adjacent sides of two closing modules (4) to cooperate with the steel belt reinforced pipe body (35), an injection cavity (44) is formed between the annular tube (53) and the arcuate surface (41) arranged in the two closing modules (4), a piston block (54) is movably arranged in the piston cavity (42) opened in the closing module (4), and the piston block (54) is assembled for switching between the following two workstations: Station 1, the piston abutment block (54) is abutted against the inner wall of one side of the piston chamber (42); Station 2, the piston sticking block (54) is away from the inner wall of one side of the piston cavity (42) to form a vacuum cavity (45); The high-pressure block (6) arranged on the inner wall of one side of the arc-shaped surface (41) slides when the injection pressure in the injection cavity (44) increases, and when the high-pressure block (6) slides, the piston block (54) switches from station one to station two.

2. The PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 1, characterized in that: The high-pressure block (6) is slidably arranged in an extrusion chamber (48) opened in the combination module (4), and a gas lift rod (59) arranged on the piston block (54) moves on the inner wall of one side of the extrusion chamber (48).

3. The PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 2, characterized in that: A fine hole (66) for relieving pressure in the extrusion chamber (48) is provided in a slide bar (65) fixedly mounted on the high-pressure block (6).

4. The PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 2, characterized in that: The closing module (4) is provided with a locking rod (7), and a locking block (67) is slidably provided on one end of the sliding rod (65) relative to the high-pressure block (6). When the high-pressure block (6) squeezes the extrusion cavity (48), the locking block (67) passes through a locking groove (72) provided on the locking rod (7) to be locked on the locking rod (7).

5. The PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 1, characterized in that: The melt injection molding machine unit comprises an end rod (2) inserted into an injection port (47) opened on the closing module (4), and a locking rod (7) is slidably arranged on the closing module (4); when the end rod (2) is inserted into the injection port (47), the first end of the locking rod (7) is squeezed, and the locking rod (7) slides to deform and store force on a force storage spring (71) fixedly installed at its second end; when the end rod (2) is separated from the injection port (47), the force storage spring (71) releases the stored force, and the sliding rod (65) is separated from the locking rod (7).

6. The PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 5, characterized in that: A sealing flap (8) for shielding and sealing the extrusion cavity (48) is fixedly mounted on the inner wall of the injection port (47).

7. The PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 6, characterized in that: The sealing flap (8) is located on the moving path of the high-pressure block (6), and when the high-pressure block (6) slides to compress the extrusion cavity (48), the high-pressure block (6) approaches the sealing flap (8).

8. The PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 7, characterized in that: A cavity portion (81) is provided in the sealing flap (8), and an annular sealing ring (21) is fixedly mounted on a conical surface provided at the end of the end rod (2). When the high-pressure block (6) slides to compress the extrusion cavity (48) and the locking block (67) is locked on the locking rod (7), the high-pressure block (6) squeezes the cavity portion (81) and causes the cavity portion (81) to be embedded in an annular groove (22) provided on the outer wall of the annular sealing ring (21).

9. The PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 8, characterized in that: The annular sealing ring (21) is provided with a protruding portion (23) on one side of the annular groove (22), and the sealing flap (8) is provided with an inflation portion (82) covering the extrusion cavity (48). When the high-pressure block (6) slides to compress the extrusion cavity (48) and squeezes the cavity portion (81), the inflation portion (82) expands to squeeze the protruding portion (23) and limit the end rod (2).

10. A PE800 type socket injection molding machine for HDPE steel strip reinforced pipe according to claim 9, characterized in that: When the air pressure in the extrusion chamber (48) decreases, the inflation portion (82) recovers its deformation to release the limit end rod (2).

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