Semicircular elbow core-pulling structure

Abstract

The utility model discloses a semicircular bent pipe core-pulling structure which comprises a fixed seat, a product cavity comprising a semicircular bent pipe is arranged in the fixed seat, a core-pulling driving assembly is arranged on the fixed seat, a sliding seat is arranged at the output end of the core-pulling driving assembly, and two symmetrically distributed core-pulling assemblies are arranged on the sliding seat. The core pulling driving assembly can drive the core pulling assemblies to stretch into or stretch out of the product cavity, and the ends, stretching into the product cavity, of the two core pulling assemblies can be connected. Two guide rails distributed in a mirror image mode are arranged on the fixing base, the ends, extending into the core pulling assembly, of the guide rails are provided with arc-shaped guide parts, the other ends of the guide rails are parallel to the driving direction of the core pulling driving assembly, and the core pulling driving assembly can drive the core pulling assembly to slide on the guide rails. According to the utility model, the core-pulling and demolding of the semicircular curve are realized through the core-pulling driving assembly, so that the manufacturing cost of the module is reduced; and meanwhile, the overall size of the mold can be reduced, so that the mold is suitable for miniaturized and lightweight injection molding equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a semicircular bent pipe core pulling structure. Background Art

[0002] Injection molds are the most common production tools used to process and mold plastic products. With the diversification of plastic products, more and more plastic products will have curved pipes. Compared with other types of solid structures, there are more technical difficulties in the design of the mold for curved demolding. Patent publication number CN117047993A discloses "a curved tube demolding structure for a curved tube forming mold". In this structure, a curved slider is driven by a hydraulic cylinder to slide on a demolding guide rail, thereby realizing the demolding of the curved part of the plastic product. The above structure can realize the demolding of pipes with a curvature not exceeding 90°, but it is not competent for curves with a curvature greater than 90°.

[0003] In the prior art, for a semicircular elbow, a demoulding core pulling mechanism is usually installed at both ends of the elbow. Each demoulding core pulling mechanism includes a demoulding oil cylinder and multiple demoulding slides. The two oil cylinders are used to pull the corresponding slides to move, thereby realizing the demoulding and closing process. In this way, two demoulding oil cylinders need to be installed on the mold, which will undoubtedly increase the production cost of the mold; at the same time, it will inevitably increase the volume of the mold, which cannot be applied to the use requirements of miniaturized and lightweight injection molding equipment. Utility Model Content

[0004] In order to solve some or all of the problems existing in the above-mentioned prior art, the utility model provides a semicircular elbow core pulling structure, including a fixed seat, a product cavity including a semicircular bend is provided in the fixed seat, a core pulling drive assembly is provided on the fixed seat, a sliding seat is provided on the output end of the core pulling drive assembly, two core pulling assemblies are provided on the sliding seat, the two core pulling assemblies are symmetrically distributed along the center line of the sliding seat, the core pulling drive assembly can drive the core pulling assembly to extend into or extend out of the product cavity, and the ends of the two core pulling assemblies extending into the product cavity can be connected; guide rails are respectively provided at positions corresponding to the core pulling assemblies on the fixed seat, one end of the guide rail extends into the corresponding core pulling assembly and slides with the core pulling assembly, an arc-shaped guide portion is provided at one end of the guide rail extending into the core pulling assembly, and the arc-shaped guide portions on the two guide rails are mirror-imaged, the other end of the guide rail is parallel to the driving direction of the core pulling drive assembly, and the core pulling drive assembly can drive the core pulling assembly to slide on the guide rail.

[0005] As a further improvement of the present invention, the core pulling assembly includes a plurality of curved sliders connected in sequence, the outer side walls of the curved sliders are in an arc shape, and the curvature of the outer side walls of the curved sliders is the same as the curvature of the arc-shaped guide portion.

[0006] As a further improvement of the utility model, a guide seat is slidably provided on the fixed seat, the guide rail is connected to the guide seat, the sliding seat can abut against the guide seat, and can push the guide seat to slide on the fixed seat.

[0007] As a further improvement of the utility model, a limit block is movably provided in the guide seat, and the limit block can extend out of the lower end surface of the guide seat. A linkage rod is provided on the sliding seat, and the linkage rod is slidably connected to the guide seat. A first groove is provided on the lower end surface of the linkage rod, and a second groove is provided on the fixed seat. The limit block can be inserted into the first groove and the second groove respectively.

[0008] As a further improvement of the present invention, a limiting groove is provided on the guide seat, and the linkage rod passes through the limiting groove and is slidably matched with the limiting groove.

[0009] As a further improvement of the utility model, the core pulling drive assembly includes a core pulling cylinder, the core pulling cylinder is connected to the fixed seat, and the output end of the core pulling cylinder is connected to the sliding seat.

[0010] As a further improvement of the utility model, a guide groove is provided on the fixed seat, two ends of the sliding seat are respectively connected to the side walls of the guide groove, and the core-pulling cylinder can drive the sliding seat to slide in the guide groove.

[0011] As a further improvement of the utility model, wear-resistant blocks are respectively provided on the side walls of the guide groove, and the sliding seat is slidably matched with the wear-resistant blocks.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model drives two core pulling assemblies to move simultaneously through a core pulling driving assembly, thereby realizing the core pulling and demoulding of the semicircular curve, simplifying the mechanical structure and reducing the production cost of the module; at the same time, it can also reduce the overall volume of the mold, making it suitable for miniaturized and lightweight injection molding equipment. In specific processing, after the injection molding equipment drives the mold to open, the core pulling driving assembly drives the two core pulling assemblies to move in the direction away from the product cavity at the same time, and the core pulling assembly slides on the guide rail, and the arc-shaped guide part on the guide rail makes the core pulling assembly rotate along the arc direction, so that the core pulling assembly slides out of the product cavity, completing the demoulding and core pulling of the semicircular curve. When closing the mold, the core pulling driving assembly drives the two core pulling assemblies to extend into the product cavity at the same time, and the core pulling assembly slides on the guide rail, and the arc-shaped guide part limits the two core pulling assemblies so that they rotate along the corresponding arc-shaped guide parts respectively, until the two core pulling assemblies are connected at one end away from the core pulling driving assembly, so that the two core pulling assemblies extend into the semicircular curve in the product cavity, so as to form a semicircular elbow outside the two core pulling assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of the top view of the structure of an embodiment of the utility model;

[0017] Figure 3 yes Figure 2 Schematic diagram of the AA section structure;

[0018] Figure 4 This is a schematic diagram of the structure of the embodiment of the utility model after the core pulling is completed;

[0019] Figure 5 It is a schematic diagram of the top view of the structure of the embodiment of the utility model after the core pulling is completed;

[0020] Figure 6 yes Figure 5 Schematic diagram of the BB section structure. DETAILED DESCRIPTION

[0021] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0022] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0023] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0024] like Figure 1-6 As shown, a semicircular elbow core-pulling structure is used to be installed on an injection mold to perform injection molding and core-pulling demoulding on a semicircular elbow. The injection mold includes a movable mold and a fixed mold, and the movable mold and the fixed mold can be connected in an opening and closing manner. During injection molding, the fixed mold and the movable mold are closed, and then rubber is injected into the injection mold to form a plastic product; after the injection molding is completed, the movable mold and the fixed mold are driven to open, and then the core-pulling mechanism is controlled to work so that the semicircular bend 100 in the molded plastic product is demoulded and core-pulled, so that the molded plastic product can be taken out from the injection mold.

[0025] The semicircular bend 100 core-pulling structure is installed on the movable mold, including a fixed seat 1, which is fixedly connected to the movable mold. A product cavity 200 containing the semicircular bend 100 is provided in the fixed seat 1. A core-pulling drive assembly is installed on the fixed seat 1. A sliding seat 2 is provided on the output end of the core-pulling drive assembly. The sliding seat 2 slides with the fixed seat 1. Two core-pulling assemblies 3 are provided on the sliding seat 2. The two core-pulling assemblies 3 are symmetrically distributed along the center line of the sliding seat 2. The core-pulling drive assembly can drive the core-pulling assembly 3 to extend into or out of the product cavity 200. During injection molding, each core pulling component 3 is driven by the core pulling drive component to extend into the product cavity 200 respectively, so as to perform injection molding on the semicircular bent tube; after the injection molding is completed and the mold is opened, the core pulling drive component is controlled to drive each core pulling component 3 to extend out of the product cavity 200 respectively, so that the core pulling component 3 is pulled away from the semicircular bend 100 of the molded product, completing the core pulling and demolding of the semicircular bend 100, so as to remove the molded semicircular bent tube from the injection mold.

[0026] Guide rails 4 are provided at positions corresponding to the core pulling components 3 on the fixed seat 1, one end of the guide rail 4 extends into the corresponding core pulling components 3, and slides with the core pulling components 3. The guide rail 4 is used to limit and guide the movement direction of the core pulling components 3 extending into or out of the product cavity 200. The guide rail 4 extending into the core pulling components 3 is provided with an arc-shaped guide portion 41, and the arc-shaped guide portions 41 on the two guide rails 4 are mirror-imaged, and the other end of the guide rail 4 is parallel to the driving direction of the core pulling drive assembly, and the core pulling drive assembly can drive the core pulling assembly 3 to slide on the guide rail 4. The arc-shaped guide portion 41 on the guide rail 4 can extend into the semicircular bend 100, and after extending into the semicircular bend 100, the center of the arc-shaped guide portion 41 coincides with the center of the semicircular bend 100. Specifically, when the mold is closed, the core pulling drive assembly drives the two core pulling assemblies 3 to move in the direction of extending into the product cavity 200. The core pulling assembly 3 is limited and guided by the guide rail 4, and first slides in a straight line on the guide rail 4. When the core pulling assembly 3 moves to the circular arc guide portion 41, it rotates along the shape of the circular arc guide portion 41, so that the core pulling assembly 3 slides into the semicircular bend 100; because the two circular arc guide portions 41 are mirror-imaged, the rotation directions of the two core pulling assemblies 3 are opposite, and they slide in the direction of approaching each other until the two core pulling assemblies 3 are connected at one end away from the sliding seat 2, so that the two core pulling assemblies 3 form a complete arc insert in the semicircular bend 100, so as to form the semicircular elbow. During core pulling and demoulding, the core pulling drive assembly is controlled to drive the two core pulling assemblies 3 to move in the direction of extending out of the product cavity 200. The core pulling assembly 3 is limited by the arc-shaped guide portion 41, and will first rotate, and the two core pulling assemblies 3 will slide in directions away from each other until the two core pulling assemblies 3 are respectively separated from the arc-shaped guide portion 41. Then, as the core pulling drive assembly continues to be driven, it will slide linearly on the guide rail 4 until the two core pulling assemblies 3 are respectively pulled out of the product cavity 200, completing the core pulling and demoulding of the semicircular bend 100 tube.

[0027] The core pulling structure of the semicircular curve 100 can drive two core pulling components 3 to move simultaneously through a core pulling drive component, thereby realizing the core pulling and demoulding of the semicircular curve 100, simplifying the mechanical structure and reducing the production cost of the module; at the same time, it can also reduce the overall volume of the mold, making it suitable for miniaturized and lightweight injection molding equipment.

[0028] The core pulling assembly 3 includes a plurality of curved sliders 31 connected in sequence. In this embodiment, each core pulling assembly 3 has four curved sliders 31 connected in sequence. In other embodiments, each core pulling assembly 3 may also have other numbers of curved sliders 31. It is only necessary to ensure that the curved sliders 31 farthest from the sliding seat 2 on the two core pulling assemblies 3 can be connected after the mold is closed, so that the two core pulling assemblies 3 can form a closed integral curved insert. The outer wall of the curved slider 31 is in an arc shape, and the curvature of the outer wall of the curved slider 31 is the same as the curvature of the arc guide portion; in other words, when the core pulling drive assembly drives the core pulling assembly 3 to extend into the product cavity 200, each curved slider 31 also extends into the semicircular curve 100 in the product cavity 200. At this time, the center of each curved slider 31 coincides with the center of the semicircular curve 100, thereby facilitating the injection molding of the semicircular curved tube. The core pulling assembly 3 in this embodiment is similar in structure to the demoulding slider and linkage assembly in Patent Publication No. CN117047993A. Therefore, the specific structure of the core pulling assembly 3 is not described in detail herein.

[0029] A slidable guide seat 5 is provided on the fixed seat 1, and one end of the guide rail 4 is fixedly connected to the guide seat 5; the sliding seat 2 can abut against the guide seat 5 and can push the guide seat 5 to slide on the fixed seat 1. In the mold closing state, the sliding seat 2 and the guide seat 5 are in a separated state; in the process of demoulding, when the core pulling drive assembly drives the sliding seat 2 to drive the curved slider 31 to move, so that all the curved sliders 31 are pulled out of the semicircular curve 100, the sliding seat 2 will abut against the guide seat 5; at this time, all the curved sliders 31 have completed the rotation movement and are separated from the semicircular curve 100. As the core pulling drive assembly continues to drive, the sliding seat 2 will push the guide seat 5 to move together, so that the guide seat 5 drives the guide rail 4 to move synchronously, until the guide rail 4 and all the curved sliders 31 are separated from the product cavity 200, and the product demoulding is completed.

[0030] Two limit blocks 6 are movably provided on the guide seat 5, and the limit blocks 6 can extend out of the lower end surface of the guide seat 5. Linkage rods 7 are respectively provided at positions corresponding to the limit blocks 6 on the sliding seat 2. The linkage rods 7 are slidably connected to the guide seat 5. First slots 71 are respectively provided at positions corresponding to the limit blocks 6 on the lower end surface of the linkage rod 7, and second slots 11 are respectively provided at positions corresponding to the limit blocks 6 on the fixed seat 1; when the core pulling drive assembly drives the sliding seat 2 to move, the limit blocks 6 can be respectively inserted into the first slot 71 and the second slot 11.

[0031] Specifically, in the mold closing state, the limit block 6 is inserted into the second slot 11, so that the guide seat 5 is limited and fixed with the fixed seat 1. In the initial stage of demoulding, the core pulling drive assembly drives the sliding seat 2 to move in the direction close to the guide seat 5, and the linkage rod 7 moves synchronously with the guide seat 5. At this time, the guide seat 5 and the guide rail 4 will not move, so that the curved slider 31 can slide on the guide rail 4, and the demoulding process of the semicircular curve 100 is realized; when all the curved sliders 31 are separated from the semicircular curve 100, the sliding seat 2 is just in contact with the guide seat 5, and at the same time, the first slot 71 on the linkage rod 7 is also just aligned with the limit block 6. As the core pulling drive assembly continues to push, the limit block 6 will be inserted into the first slot 71, and the sliding seat 2 will push the guide seat 5 to move together, so that the guide seat 5 and the guide rail 4 move together, until the guide rail 4 and the curved slider 31 are separated from the product cavity 200 as a whole, and the demoulding and core pulling process is completed. When the curved slider 31 is reset, at the initial stage of movement, the core pulling drive assembly pushes the sliding seat 2 to move in the direction away from the guide seat 5. At this time, the limit block 6 is inserted into the first slot 71, so the guide seat 5 will move synchronously with the sliding seat 2 until the limit block 6 moves to align with the second slot 11. Under the lateral force of the slot 71 of the linkage rod 7, the limit block 6 will be inserted into the second slot 11, so that the guide seat 5 and the fixed seat 1 are limited and fixed. At this time, the curved slider 31 also moves to the corresponding position of the semicircular curve 100. As the core pulling drive assembly continues to drive, the sliding seat 2 is separated from the guide seat 5, and the guide rail 4 will not move, so that the curved slider 31 makes a circular motion on the arc-shaped guide part on the guide rail 4 until all the curved sliders 31 are reset to the semicircular curve 100, and the curved sliders 31 on the two core pulling assemblies 3 away from the sliding seat 2 are connected.

[0032] In order to limit and guide the sliding direction of the linkage rod 7, a limiting groove 51 is provided on the guide seat 5, and one end of the linkage rod 7 away from the sliding seat 2 extends into the limiting groove 51 and slides with the limiting groove 51. In the early stage of mold opening, when the core pulling drive assembly drives the sliding seat 2 to move, the linkage rod 7 can slide in the limiting groove 51 until the first slot 71 on the linkage rod 7 is aligned with the limiting block 6. By setting the limiting groove 51, it can be ensured that the first slot 71 can be aligned with the limiting block 6, thereby improving the stability of the transmission.

[0033] In order to limit and guide the movement direction of the sliding seat 2, a guide groove 12 is provided on the fixed seat 1, and the sliding seat 2 is limited in the guide groove 12, and the two ends of the sliding seat 2 are respectively connected to the side walls of the guide groove 12, and the core pulling drive assembly can drive the sliding seat 2 to slide in the guide groove 12; the movement direction of the sliding seat 2 is limited and guided by the guide groove 12, ensuring that the core pulling, demolding and mold closing processes proceed smoothly, thereby improving the working stability of the core pulling structure of the semicircular curve 100.

[0034] In order to extend the service life, wear-resistant blocks 8 are respectively provided on the side walls of the guide groove 12, and the sliding seat 2 is slidably matched with the wear-resistant blocks 8; when the core-pulling drive assembly is working, the sliding seat 2 can be driven to slide on the wear-resistant blocks 8. The wear-resistant blocks 8 can be made of any wear-resistant material. By providing the wear-resistant blocks 8, the wear can be reduced, thereby ensuring the transmission accuracy of the semicircular bend 100 core-pulling structure when working, improving the processing stability, and extending the service life.

[0035] In this embodiment, the core pulling drive assembly includes a core pulling cylinder 9, which is fixedly mounted on the fixed seat 1, and the output end of the core pulling cylinder 9 is fixedly connected to the sliding seat 2. When the core needs to be pulled out of the mold or reset, the core pulling cylinder 9 can be controlled to drive the sliding seat 2 to slide in the guide groove 12, thereby pulling or pushing each curved slide to move, so that the curved slide 31 moves in the direction of extending into or out of the product cavity 200.

[0036] Working principle:

[0037] When the injection molding is completed, the injection molding equipment controls the mold to open, so that the movable mold and the fixed mold are separated. At this time, the curved sliders 31 on the two core pulling assemblies 3 away from the end of the sliding seat 2 are connected to each other, and all the curved sliders 31 extend into the semicircular curve 100 in the product cavity 200. The core pulling cylinder 9 is controlled to work, driving the sliding seat 2 to move away from the product cavity 200, and the sliding seat 2 drives all the curved sliders 31 to move synchronously. The curved sliders 31 are limited by the arc-shaped guide part to rotate, so that the two core pulling assemblies 3 are separated from each other, and each curved slider 31 is rotated to separate from the semicircular curve 100, and the curved slider 31 separated from the semicircular curve 100 slides linearly on the guide rail 4 driven by the core pulling cylinder 9. When the sliding seat 2 moves away from the product cavity 200, the linkage rod 7 also moves with the sliding seat 2. When all the curved sliders 31 are separated from the semicircular curved path 100, the first slot 71 on the linkage rod 7 is aligned with the limit block 6, and the sliding seat 2 is also in contact with the guide seat 5. With the continued driving of the core pulling cylinder 9, the sliding seat 2 will push the guide seat 5 to move synchronously, so that the limit block 6 is inserted into the first slot 71, and the guide rail 4 moves with the curved slider 31 until the guide rail 4 and the curved slider 31 are separated from the product cavity 200 as a whole, completing the core pulling and demolding process of the semicircular curved tube plastic product.

[0038] When resetting, the core-pulling cylinder 9 drives the sliding seat 2 to extend into the direction of the product cavity 200. At this time, the limit block 6 is inserted into the first slot 71, so that the guide seat 5 is connected and fixed with the sliding seat 2. Therefore, the guide seat 5 moves synchronously with the sliding seat 2. At the same time, the sliding seat 2 will push the curved slider 31 to extend into the product cavity 200. When the front curved slider 31 slides to the corresponding position of the semicircular curve 100, the limit block 6 also moves to align with the second slot 11, and is laterally divided by the slot 71 of the linkage rod 7. Under the action of force, the limit block 6 will be inserted into the second slot 11 and extend out of the first slot 71 at the same time, so that the guide seat 5 is limitedly connected and fixed with the fixed seat 1; as the core pulling cylinder 9 continues to drive, the guide rail 4 will not move at this time, and the sliding seat 2 pushes the guide rail 4 of the curved slider 31 to slide, and the curved slider 31 is limited by the arc guide part and rotates until all the curved sliders 31 complete the arc motion, and the frontmost curved sliders 31 on the core pulling components 3 are connected together, then the resetting process of the curved slider 31 is completed.

[0039] The above-mentioned specific implementation mode is a preferred implementation mode of the present utility model, and is not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation mode, and all equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A semicircular elbow core pulling structure, characterized in that: It comprises a fixed seat, a product cavity including a semicircular bend is provided in the fixed seat, a core pulling drive assembly is provided on the fixed seat, a sliding seat is provided on the output end of the core pulling drive assembly, two core pulling assemblies are provided on the sliding seat, the two core pulling assemblies are symmetrically distributed along the center line of the sliding seat, the core pulling drive assembly can drive the core pulling assemblies to extend into or out of the product cavity, and one end of the two core pulling assemblies extending into the product cavity can be connected; Guide rails are respectively provided at positions corresponding to the core pulling assemblies on the fixed seat, one end of the guide rail extends into the corresponding core pulling assemblies and slides with the core pulling assemblies, an arc-shaped guide portion is provided at the end of the guide rail extending into the core pulling assemblies, and the arc-shaped guide portions on the two guide rails are mirror-distributed, the other end of the guide rail is parallel to the driving direction of the core pulling drive assembly, and the core pulling drive assembly can drive the core pulling assembly to slide on the guide rail.

2. The semicircular elbow core pulling structure according to claim 1, characterized in that: The core pulling assembly includes a plurality of curved sliders connected in sequence, the outer side walls of the curved sliders are in an arc shape, and the curvature of the outer side walls of the curved sliders is the same as the curvature of the arc-shaped guide portion.

3. The semicircular elbow core pulling structure according to claim 2, characterized in that: A guide seat is slidably provided on the fixed seat, the guide rail is connected to the guide seat, and the sliding seat can abut against the guide seat and can push the guide seat to slide on the fixed seat.

4. The semicircular elbow core pulling structure according to claim 3 is characterized in that: A limit block is movably provided in the guide seat, and the limit block can extend out of the lower end surface of the guide seat. A linkage rod is provided on the sliding seat, and the linkage rod is slidably connected to the guide seat. A first groove is provided on the lower end surface of the linkage rod, and a second groove is provided on the fixed seat. The limit block can be inserted into the first groove and the second groove respectively.

5. The semicircular elbow core pulling structure according to claim 4, characterized in that: The guide seat is provided with a limiting groove, and the linkage rod passes through the limiting groove and is slidably matched with the limiting groove.

6. The semicircular elbow core pulling structure according to any one of claims 1 to 4, characterized in that: The core pulling drive assembly comprises a core pulling cylinder, the core pulling cylinder is connected to the fixed seat, and the output end of the core pulling cylinder is connected to the sliding seat.

7. The semicircular elbow core pulling structure according to claim 6, characterized in that: The fixed seat is provided with a guide groove, and the two ends of the sliding seat are respectively connected to the side walls of the guide groove, and the core-pulling cylinder can drive the sliding seat to slide in the guide groove.

8. The semicircular elbow core pulling structure according to claim 7, characterized in that: Wear-resistant blocks are respectively arranged on the side walls of the guide groove, and the sliding seat is slidably matched with the wear-resistant blocks.

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