A nuclear power cable tube continuous injection molding apparatus

Abstract

This invention relates to the field of cable pipe processing technology, and more particularly to a continuous injection molding equipment for nuclear power cable pipes. The equipment includes an injection molding machine body, a cooling pipe disposed inside the injection molding machine body, and a cable mold movably disposed within the cooling pipe. A casting mechanism is provided at the top of the cooling pipe for injecting cable raw materials into the cable mold for cooling and molding. The cable mold includes an upper mold and a lower mold, with connecting plates fixedly disposed on both sides of the upper and lower molds, and the two connecting plates are fixedly connected by a plurality of equidistant bolts. The casting mechanism includes a plurality of equidistantly distributed support crossbars disposed at the top of the injection molding machine body. This invention can prevent large temperature differences at different locations on the entire mold from affecting the quality of the molded cable pipe, improving the molding effect of the cable pipe, ensuring the production quality of the cable pipe, and simultaneously improving the production efficiency of the injection molding equipment, contributing to the stability and safety of the injected raw materials.

Description

Technical Field

[0001] This invention relates to the field of cable pipe processing technology, and in particular to a continuous injection molding equipment for nuclear power cable pipes. Background Technology

[0002] Nuclear power cable conduits are special cable protection pipes used in nuclear power plants. Their main function is to protect cables and wires in nuclear power plants from damage or interference. They are usually manufactured using the injection molding method. In existing cable conduit injection molding equipment, heated and molten raw materials are filled into the cable mold cavity through a gating system. The raw materials then cool and solidify in the mold. However, as soon as the molten raw materials enter the cable mold, the temperature around the mold hole rises, resulting in significant temperature differences at different locations on the entire mold. This reduces the quality of the molded cable conduit, affects the injection molding effect, and makes it difficult to meet actual usage requirements. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a continuous injection molding equipment for nuclear power cable pipes, which solves the problem that the addition of molten raw materials to the cable mold in the prior art results in a large temperature difference at different positions on the entire mold, thus affecting the molding effect of the cable pipe.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] A continuous injection molding equipment for nuclear power cable conduits includes an injection molding machine body, a cooling pipe disposed inside the injection molding machine body, and a cable mold movably disposed within the cooling pipe. A casting mechanism is provided at the top of the cooling pipe for injecting cable raw materials into the cable mold for cooling and molding. The cable mold includes an upper mold and a lower mold, with connecting plates fixedly disposed on both sides of the upper and lower molds, and the two connecting plates are fixedly connected by a plurality of equidistant bolts. The casting mechanism includes a plurality of equidistantly distributed support crossbars disposed at the top of the injection molding machine body, and a plurality of equidistantly arranged support crossbars fixedly embedded in the top of the cooling pipe. The injection mechanism includes a connecting pipe and a supporting crossbar that matches the connecting pipe. A sprue is provided at the bottom of the connecting pipe and located at the top of the upper mold. A movable vertical pipe is slidably provided inside the connecting pipe. A feeding pipe that matches the sprue is detachably provided inside the movable vertical pipe. The top of the feeding pipe passes through the supporting crossbar and is connected to the injection system on the injection machine body. A U-shaped rod is detachably provided at the top of the movable vertical pipe. A lifting assembly is provided in the middle of the supporting crossbar to drive the U-shaped rod downward to insert the feeding pipe into the connecting pipe that matches the sprue. The injection mechanism also includes a clamping assembly provided on the supporting crossbar for clamping and positioning the cooling pipe.

[0006] As a further optimization of the present invention, the lifting assembly includes a strip groove formed on one side of the support crossbar and two symmetrically arranged limiting vertical grooves formed on the support crossbar. A connecting horizontal shaft is provided in the middle of the inner side of the strip groove. The lifting assembly also includes a drive assembly provided on the top side of the support crossbar for driving the connecting horizontal shaft to rotate.

[0007] As a further optimization of the present invention, the two ends of the U-shaped rod pass through two limiting vertical grooves and are slidably connected thereto, and vertical toothed racks are fixedly embedded at both ends of one side of the U-shaped rod.

[0008] As a further optimization of the present invention, the two ends of the connecting horizontal shaft are respectively provided with limiting blocks fixed to the supporting horizontal bar, and one side of the vertical rack is provided with a transmission gear fixed to the connecting horizontal shaft.

[0009] As a further optimization of the present invention, the drive assembly includes a horizontal rack disposed on one side of the middle of the connecting horizontal shaft, and a limiting horizontal groove formed on the horizontal rack. A limiting post fixed to the supporting horizontal rod is slidably disposed inside the limiting horizontal groove, and a drive gear is meshed at the bottom of the horizontal rack.

[0010] As a further optimization of the present invention, a worm gear is fixedly provided at the shaft center of the drive gear and rotates with the support crossbar through a bearing. A worm wheel fixed to the connecting crossbar is meshed at the top of the worm gear. A servo cylinder is fixedly installed on one side of the top of the support crossbar.

[0011] As a further optimization of the present invention, a connecting block fixed to the top of the horizontal rack is fixed at the output shaft of the servo cylinder.

[0012] As a further optimization of the present invention, the clamping assembly includes movable clamping rods disposed at both ends of the bottom of the support crossbar. The tops of the two movable clamping rods are slidably connected to both ends of the strip groove, and threaded shafts are fixedly disposed at both ends of the connecting crossbar. The tops of the two movable clamping rods are respectively provided with threaded holes that are threadedly connected to the threaded shafts.

[0013] As a further optimization of the present invention, a return spring is fixedly fitted on the top side of the movable clamping rod, which is sleeved on the outside of one end of the threaded shaft and fixed to the limiting block.

[0014] By employing the above technical solution, the present invention provides a continuous injection molding equipment for nuclear power cable pipes, which, compared with the prior art, has at least the following beneficial effects:

[0015] 1. This invention uses a casting mechanism to rapidly inject molten raw material into a cable mold. A movable vertical pipe and a feeding pipe are simultaneously inserted into a connecting pipe, with the feeding pipe matching the injection port. Heated raw material is injected into the cable mold through the injection system on the injection machine body. The raw material flows from both sides of the upper mold to the lower mold, thus filling both molds completely. Simultaneously, a cooling pipe cools the cable mold to prevent significant temperature differences at different locations on the mold, which could affect the quality of the formed cable tube. This improves the forming effect of the cable tube, ensures its production quality, and increases the production efficiency of the injection molding equipment.

[0016] 2. This invention uses a lifting assembly to drive a U-shaped rod downwards, inserting the feeding tube into the connecting tube and connecting it to the injection port. A drive assembly rotates the connecting horizontal shaft, which in turn drives the U-shaped rod downwards through a series of transmissions. The U-shaped rod pushes the movable vertical tube and the feeding tube downwards, aligning the feeding tube with the injection port. The injection system on the injection machine can then inject raw materials through the injection port, ensuring a perfect fit between the feeding tube and the injection port. This contributes to the stability and safety of the injected raw materials, thereby guaranteeing the injection molding effect.

[0017] 3. The present invention further limits the cooling pipe by setting a clamping component, so that the cooling pipe does not need to be fixed to the injection machine body by bolts. After long-term use, the cooling pipe needs to be maintained regularly to ensure its cooling effect. Fixing the cooling pipe by clamping component can not only ensure the stability during cable pipe injection molding, but also facilitate subsequent inspection and maintenance, and extend the service life of the molding equipment. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a partial sectional view of the front of the present invention;

[0021] Figure 3 This is a side sectional view of the present invention;

[0022] Figure 4 This is a partial exploded view of the casting mechanism of the present invention;

[0023] Figure 5 This is a partial exploded view of the lifting assembly of the present invention;

[0024] Figure 6This is a schematic diagram of the structure of the driving component of the present invention;

[0025] Figure 7 This is a schematic diagram of the clamping assembly of the present invention;

[0026] Figure 8 for Figure 2 A magnified structural diagram of part A.

[0027] In the diagram: 1. Injection unit; 2. Cooling pipes;

[0028] 3. Cable mold; 31. Upper mold; 32. Lower mold;

[0029] 4. Casting mechanism; 41. Supporting crossbar; 42. Connecting pipe; 43. Injection port; 44. Movable vertical pipe; 45. Feeding pipe; 46. U-shaped rod;

[0030] 47. Lifting assembly; 471. Strip slide; 472. Limiting vertical groove; 473. Vertical rack; 474. Connecting horizontal shaft; 475. Limiting stop; 476. Transmission gear;

[0031] 477. Drive assembly; 4771. Horizontal rack; 4772. Limit pin; 4773. Drive gear; 4774. Servo cylinder; 4775. Worm gear; 4776. Connecting block;

[0032] 48. Clamping assembly; 481. Movable clamping rod; 482. Threaded shaft; 483. Return spring. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] First Embodiment

[0035] Nuclear power plant cable conduits typically require excellent corrosion resistance, mechanical properties, and fire resistance to ensure the safe operation of nuclear power plants. The process involves heating plastic raw materials to a molten state and injecting them into a mold using injection molding. After cooling and solidification, the final nuclear power plant cable conduit is formed. Traditional molding equipment requires measures to prevent significant temperature differences across different parts of the mold from affecting the quality of the formed cable conduit, thus improving the molding effect. Figure 1 - Figure 8As shown, this embodiment provides a continuous injection molding equipment for nuclear power cable pipes, which consists of an injection molding machine body 1, a cooling pipe 2, a cable mold 3, and a casting mechanism 4. The cooling pipe 2 is located inside the injection molding machine body 1, and the cable mold 3 is movably disposed in the cooling pipe 2. The cable mold 3 includes an upper mold 31 and a lower mold 32. Connecting plates are fixedly provided on both sides of the upper mold 31 and the lower mold 32, and the two connecting plates are fixedly connected by a number of bolts arranged at equal intervals, so as to facilitate demolding after the cable pipe is formed.

[0036] Specifically, such as Figure 4 As shown, the casting mechanism 4 is set at the top of the cooling pipe 2 to inject cable raw materials into the cable mold 3 for cooling and molding. The casting mechanism 4 includes several equidistantly distributed support crossbars 41 set at the top of the inner side of the injection machine body 1, and several equidistantly arranged connecting pipes 42 fixedly embedded at the top of the cooling pipe 2. The support crossbars 41 and the connecting pipes 42 are matched. An injection port 43 is provided at the bottom of the connecting pipe 42 and opened at the top of the upper mold 31. A movable vertical pipe 44 is slidably arranged on the inner side of the connecting pipe 42. A feeding pipe 45 matching the injection port 43 is detachably arranged on the inner side of the movable vertical pipe 44. The top of the feeding pipe 45 passes through the support crossbars 41 and is connected to the injection system on the injection machine body 1.

[0037] The bottom end of the feeding pipe 45 fits perfectly with the injection port 43, making the material conveying process more stable. A U-shaped rod 46 is detachably installed at the top of the movable vertical pipe 44. When the U-shaped rod 46 moves downwards, it pushes the movable vertical pipe 44 and the feeding pipe 45 downwards. The feeding pipe 45 matches the injection port 43, allowing the injection system on the injection machine body 1 to inject molten material through the injection port 43. The material flows from both sides of the upper mold 31 into the lower mold 32, filling both molds. Simultaneously, the cooling pipe 2 cools the cable mold 3 to prevent large temperature differences at different locations on the mold from affecting the quality of the formed cable tube.

[0038] Second Embodiment

[0039] To ensure a perfect fit between the feed tube 45 and the injection port 43, the stability and safety of the injected material are improved, thereby guaranteeing the injection molding effect. Figure 5 and Figure 6As shown, in this embodiment, a lifting assembly 47 is provided in the middle of the supporting crossbar 41 to drive the U-shaped rod 46 downward to insert the feeding pipe 45 into the connecting pipe 42 and match the injection port 43. Specifically, the lifting assembly 47 includes a strip-shaped groove 471 opened on one side of the supporting crossbar 41 and two symmetrically arranged limiting vertical grooves 472 opened on the supporting crossbar 41. The two ends of the U-shaped rod 46 pass through the two limiting vertical grooves 472 respectively and are slidably connected to them. Vertical racks 473 are fixedly embedded at both ends of one side of the U-shaped rod 46. A vertical rack 473 is provided in the middle of the inner side of the strip-shaped groove 471. A connecting horizontal shaft 474 is provided, and each end of the connecting horizontal shaft 474 is respectively provided with a limiting block 475 fixed to the supporting horizontal rod 41. A transmission gear 476 fixed to the connecting horizontal shaft 474 is meshed on one side of the vertical rack 473. By driving the transmission gear 476 to rotate, the transmission gear 476 drives the vertical rack 473 to move downward. The vertical rack 473 drives the U-shaped rod 46 to move downward. The two ends of the U-shaped rod 46 slide inside the two limiting vertical grooves 472 respectively, ensuring the stability of the movement of the U-shaped rod 46, thereby improving the safety of the injection molding device and ensuring the effect of cable pipe injection molding.

[0040] Furthermore, the lifting assembly 47 also includes a drive assembly 477 disposed on one side of the top of the support crossbar 41 for driving the connecting crossbar 474 to rotate. The drive assembly 477 includes a horizontal rack 4771 disposed on one side of the middle of the connecting crossbar 474, and a limiting groove formed on the horizontal rack 4771. A limiting post 4772 fixed to the support crossbar 41 is slidably disposed inside the limiting groove. The horizontal rack 4771 slides outside the limiting post 4772 to ensure the stability of the movement of the horizontal rack 4771. A drive gear 4773 is meshed at the bottom of the horizontal rack 4771. A worm gear 4775 is fixedly installed at the axis of the support crossbar 41 and rotates through a bearing. A worm wheel fixed to the connecting crossbar 474 is meshed at the top of the worm gear 4775. A servo cylinder 4774 is fixedly installed on one side of the top of the support crossbar 41. A connecting block 4776 fixed to the top of the horizontal rack 4771 is fixed at the output shaft of the servo cylinder 4774. The movement of the output shaft of the servo cylinder 4774 drives the U-shaped rod 46 to move up and down, which can ensure a more stable and safe process during the injection of raw materials. This not only extends the service life of the molding device, but also reduces maintenance costs.

[0041] By activating the servo cylinder 4774, the output shaft of the servo cylinder 4774 drives the horizontal rack 4771 to move through the connecting block 4776. The horizontal rack 4771 drives the drive gear 4773 at its bottom to rotate. The drive gear 4773 drives the worm 4775 at its shaft center to rotate. The worm 4775 drives the worm wheel on one side to rotate. The worm wheel drives the connecting horizontal shaft 474 at its shaft center to rotate. The connecting horizontal shaft 474 drives the two transmission gears 476 on it to rotate. The two transmission gears 476 simultaneously drive the vertical rack 473 on one side to move downward, thereby driving the U-shaped rod 46 to move.

[0042] Third Embodiment

[0043] To ensure stability during cable pipe injection molding while facilitating subsequent inspection and maintenance, such as Figure 7 As shown, in this embodiment, a clamping assembly 48 for clamping and positioning the cooling pipe 2 is provided on the support crossbar 41. Specifically, the clamping assembly 48 includes movable clamping rods 481 disposed at both ends of the bottom of the support crossbar 41. The tops of the two movable clamping rods 481 are slidably connected to both ends of the strip groove 471. Threaded shafts 482 are fixedly disposed at both ends of the connecting crossbar 474. Threaded holes for threaded connection with the threaded shafts 482 are respectively opened on the tops of the two movable clamping rods 481. When the threaded shafts 482 at both ends of the connecting crossbar 474 rotate, they drive the two movable clamping rods 481 to move simultaneously in opposite directions. A return spring 483 is fixedly disposed on one side of the top of the movable clamping rod 481, sleeved on the outside of one end of the threaded shaft 482 and fixed to the limiting block 475.

[0044] While the connecting horizontal shaft 474 rotates, it drives the threaded shafts 482 at both ends to rotate, causing the two movable clamping rods 481 to move towards the middle at the same time. The two movable clamping rods 481 clamp and position the cooling pipe 2. The movable clamping rods 481 squeeze the return spring 483, and the return spring 483 is compressed due to elastic deformation, which provides a certain buffering effect on the movable clamping rods 481. This can ensure the stability during the injection molding of the cable pipe and facilitate subsequent inspection and maintenance.

[0045] In the process of manufacturing nuclear power cable conduits, the injection molding equipment first installs the cooling pipe 2 inside the injection molding machine body 1 and limits both ends of the cooling pipe 2. Then, the cable mold 3 is transported into the cooling pipe 2 via a conveyor. Next, the servo cylinder 4774 is activated. The output shaft of the servo cylinder 4774 pushes the connecting block 4776 to move. The connecting block 4776 pushes the horizontal rack 4771 at its bottom to move. The horizontal rack 4771 drives the drive gear 4773 at its bottom to rotate. The drive gear 4773 drives the worm gear 4775 at its shaft to rotate. 4775 drives the worm gear on one side to rotate, the worm gear drives the connecting horizontal shaft 474 at its center to rotate, the connecting horizontal shaft 474 drives the two transmission gears 476 on it to rotate, the two transmission gears 476 simultaneously drive the vertical rack 473 on one side to move downward, the vertical rack 473 drives the U-shaped rod 46 on one side to move downward, the two ends of the U-shaped rod 46 slide inside the two limiting vertical grooves 472 respectively, the U-shaped rod 46 pushes the movable vertical tube 44 downward, the movable vertical tube 44 drives the feeding pipe 45 on it to move downward, the feeding pipe 45 matches the injection port 43.

[0046] At the same time, as the connecting horizontal shaft 474 rotates, it drives the threaded shafts 482 at both ends to rotate, causing the two movable clamping rods 481 to move towards the middle simultaneously. The two movable clamping rods 481 clamp and position the cooling pipe 2. Then, the injection machine body 1 is started, and the injection system injects molten cable pipe raw material into the injection port 43 through the feeding pipe 45. The cable pipe raw material fills the upper mold 31 and the lower mold 32, and then cools and solidifies to form the shape.

[0047] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous injection molding equipment for nuclear power cable pipes, comprising an injection molding machine body (1), a cooling pipe (2) disposed inside the injection molding machine body (1), and a cable mold (3) movably disposed in the cooling pipe (2), characterized in that: The top of the cooling pipe (2) is provided with a casting mechanism (4) for injecting cable raw materials into the cable mold (3) for cooling and forming; The cable mold (3) includes an upper mold (31) and a lower mold (32). Connecting plates are fixedly installed on both sides of the upper mold (31) and the lower mold (32), and the two connecting plates are fixedly connected by a number of bolts that are equidistantly arranged. The casting mechanism (4) includes several equidistantly distributed support crossbars (41) located on the top inner side of the injection molding machine body (1), and several equidistantly arranged connecting pipes (42) fixedly embedded in the top of the cooling pipe (2). The support crossbars (41) are matched with the connecting pipes (42). A sprue (43) is provided at the bottom of the connecting pipe (42) and opened on the top of the upper mold (31). A movable vertical pipe (44) is slidably arranged on the inner side of the connecting pipe (42). A feeding device matching the sprue (43) is detachably arranged on the inner side of the movable vertical pipe (44). The feeding tube (45) is connected to the injection system on the injection machine body (1) through the support crossbar (41) at the top. The top of the movable vertical tube (44) is detachably provided with a U-shaped rod (46). A lifting component (47) is provided in the middle of the support crossbar (41) to drive the U-shaped rod (46) to move downward and insert the feeding tube (45) into the connecting tube (42) to match the injection port (43). The casting mechanism (4) also includes a clamping component (48) provided on the support crossbar (41) for clamping and positioning the cooling pipe (2).

2. The continuous injection molding equipment for nuclear power cable pipes according to claim 1, characterized in that: The lifting assembly (47) includes a strip groove (471) opened on one side of the support crossbar (41) and two symmetrically arranged limiting vertical grooves (472) opened on the support crossbar (41). A connecting horizontal shaft (474) is provided in the middle of the inner side of the strip groove (471). The lifting assembly (47) also includes a drive assembly (477) provided on the top side of the support crossbar (41) for driving the connecting horizontal shaft (474) to rotate.

3. The continuous injection molding equipment for nuclear power cable pipes according to claim 2, characterized in that: The two ends of the U-shaped rod (46) pass through two limiting vertical grooves (472) and are slidably connected thereto. Vertical toothed racks (473) are fixedly embedded at both ends of one side of the U-shaped rod (46).

4. The continuous injection molding equipment for nuclear power cable pipes according to claim 3, characterized in that: The two ends of the connecting horizontal shaft (474) are respectively provided with limiting blocks (475) fixed to the supporting horizontal bar (41), and the vertical rack (473) is provided with a transmission gear (476) fixed to the connecting horizontal shaft (474) on one side.

5. The continuous injection molding equipment for nuclear power cable pipes according to claim 2, characterized in that: The drive assembly (477) includes a horizontal rack (4771) disposed on one side of the middle of the connecting horizontal shaft (474), and a limiting horizontal groove opened on the horizontal rack (4771). A limiting post (4772) fixed to the supporting horizontal rod (41) is slidably disposed on the inner side of the limiting horizontal groove. A drive gear (4773) is meshed at the bottom of the horizontal rack (4771).

6. The continuous injection molding equipment for nuclear power cable pipes according to claim 5, characterized in that: The drive gear (4773) has a worm (4775) fixedly installed at its shaft center, which rotates with the support crossbar (41) through a bearing. A worm wheel fixed to the connecting crossbar (474) is meshed at the top of the worm (4775). A servo cylinder (4774) is fixedly installed on one side of the top of the support crossbar (41).

7. The continuous injection molding equipment for nuclear power cable pipes according to claim 6, characterized in that: The output shaft of the servo cylinder (4774) is fixed with a connecting block (4776) that is fixed to the top of the horizontal rack (4771).

8. The continuous injection molding equipment for nuclear power cable pipes according to claim 2, characterized in that: The clamping assembly (48) includes movable clamping rods (481) disposed at both ends of the bottom of the support crossbar (41). The tops of the two movable clamping rods (481) are slidably connected to both ends of the strip groove (471). Threaded shafts (482) are fixedly disposed at both ends of the connecting crossbar (474). Threaded holes for threaded connection with the threaded shafts (482) are respectively opened on the tops of the two movable clamping rods (481).

9. The continuous injection molding equipment for nuclear power cable pipes according to claim 8, characterized in that: A return spring (483) is fixed to one side of the top of the movable clamping rod (481), which is sleeved on the outside of one end of the threaded shaft (482) and fixed to the limiting block (475).

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