A synchronous core-pulling device with a four-cavity elbow

Abstract

This utility model relates to the technical field of pipe molds, and more specifically, to a synchronous core-pulling device for a four-cavity elbow. It includes an upper mold assembly, a lower mold assembly, a drive assembly, a transmission assembly, and a core-pulling assembly. A cavity is provided between the upper and lower mold assemblies, and a bent pipe insert is placed within the cavity. The bent pipe insert is connected to the core-pulling assembly. Both the core-pulling assembly and the transmission assembly are rotatably connected to the lower mold assembly. The core-pulling assembly includes a first core-pulling group, a second core-pulling group, a third core-pulling group, and a fourth core-pulling group. The first and second core-pulling groups are connected to the drive assembly, and the transmission assembly is located between the first and third core-pulling groups and between the second and fourth core-pulling groups. This utility model achieves synchronous rotation and demolding of the four-cavity bent pipe insert using only a single drive assembly, ensuring production efficiency while significantly reducing production energy consumption and equipment costs.

Description

Technical Field

[0001] This utility model relates to the technical field of pipe molds, and more specifically, to a synchronous core-pulling device for a four-cavity elbow. Background Technology

[0002] In the manufacturing process of bent pipes, mandrels are often used to form the internal cavity structure of the pipe fitting. After the pipe fitting has been initially formed and solidified, the internal mandrel must be precisely extracted to obtain the final hollow tubular product. This process of extracting the mandrel is called "core pulling". For bends with large curvature, traditional core pulling molds typically use a hydraulic cylinder to pull a slider to extract the core of the socket section in a straight line. At the same time, a connecting rod on the slider pulls a rotating plate to rotate, so that the arc-shaped core at the other end follows the rotation of the rotating plate to complete the core pulling.

[0003] In the prior art, such as Chinese patent CN211492670U, a linkage-type rotary core-pulling device for a four-cavity long elbow mold is disclosed. This device includes an upper mold plate and a lower mold plate. The upper mold plate contains an upper mold core, and the lower mold plate contains a lower mold core. Four cavities for forming elbow fittings are located between the upper and lower mold cores. Each cavity contains an elbow core and a flat-mouth core. A flat-mouth core-pulling mechanism is connected to the outside of the flat-mouth core, and the elbow core is connected to the elbow core-pulling mechanism. The elbow core-pulling mechanism and the flat-mouth core-pulling mechanism are connected by a connecting rod. A straight-pulling guide rod is provided on the outside of the elbow core, and a straight-pulling core, in its closed state, abuts against the end of the elbow core, is fitted on the straight-pulling guide rod. A straight-pulling slider is connected to the outside of the straight-pulling core. The elbow core-pulling mechanism has a straight-pulling slide rail parallel to the straight-pulling guide rod, and the straight-pulling slider is connected to the straight-pulling slide rail. However, this core-pulling device requires a dual-cylinder drive to complete the core-pulling of the four-cavity elbow, resulting in a large footprint and high energy consumption. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies that use dual hydraulic cylinders for driving, which occupy a large area and consume a lot of energy. It provides a one-outlet four-cavity elbow synchronous core pulling device that can complete the core pulling work of one-outlet four-cavity elbow by driving with only a single hydraulic cylinder, which not only reduces the space occupied, but also reduces the production cost.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A synchronous core-pulling device for a four-cavity elbow is provided, comprising an upper mold assembly, a lower mold assembly, a drive assembly, a transmission assembly, and a core-pulling assembly. A cavity is provided between the upper mold assembly and the lower mold assembly, and a bending pipe insert is provided in the cavity. The bending pipe insert is connected to the core-pulling assembly. The core-pulling assembly and the transmission assembly are both rotatably connected to the lower mold assembly. The core-pulling assembly includes a first core-pulling group, a second core-pulling group, a third core-pulling group, and a fourth core-pulling group. The first core-pulling group and the second core-pulling group are connected to the drive assembly. The transmission assembly is disposed between the first core-pulling group and the third core-pulling group, and between the second core-pulling group and the fourth core-pulling group.

[0007] This utility model's four-cavity elbow synchronous core-pulling device first completes the forming of the elbow pipe fitting in the cavity between the upper mold assembly and the lower mold assembly. Then, the drive assembly drives the first core-pulling group and the second core-pulling group to move, while the transmission assembly transmits power to the third core-pulling group and the fourth core-pulling group, causing the elbow insert to be ejected from the elbow pipe fitting. Thus, by driving four core-pulling groups with a single drive assembly, the synchronous rotation and demolding of the four-cavity elbow insert can be achieved, ensuring production efficiency while significantly reducing production energy consumption and equipment costs.

[0008] Furthermore, the first and fourth core-pulling groups rotate in the same direction, the second and third core-pulling groups rotate in the same direction, and the first and second core-pulling groups rotate in opposite directions. The first and fourth core-pulling groups rotate in the same direction, the second and third core-pulling groups rotate in the same direction, and the first and second core-pulling groups maintain opposite movements. This allows the four-cavity bent tube insert to complete interference-free synchronous rotational core-pulling within a limited space, avoiding motion conflicts and maximizing the use of mold space, providing a structural basis for realizing single-drive component operation.

[0009] Furthermore, the transmission assembly includes a first transmission group disposed between the first core-pulling group and the third core-pulling group, and a second transmission group disposed between the second core-pulling group and the fourth core-pulling group. Through a grouped linkage design, the transmission assembly is respectively disposed between the first and third core-pulling groups and between the second and fourth core-pulling groups, decomposing the driving force input from a single drive assembly into two sets of driving forces that respectively drive the movement of the third and fourth core-pulling groups, ensuring that the four sets of bent pipe inserts can complete synchronous core-pulling actions.

[0010] Furthermore, the first transmission group includes a first transition gear and a second transition gear that mesh with each other, the first transition gear meshing with the first core-pulling group, and the second transition gear meshing with the third core-pulling group; the second transmission group includes a third transition gear and a fourth transition gear that mesh with each other, the third transition gear meshing with the second core-pulling group, and the fourth transition gear meshing with the fourth core-pulling group.

[0011] Furthermore, the rotation axes of the first, second, third, and fourth core-pulling groups coincide with the center of the corresponding circle of the bent pipe insert. By aligning the rotation axes of each core-pulling group with the center of the bent pipe insert, the motion trajectory of the rotating core-pulling is precisely matched with the curvature of the bent pipe, thereby ensuring that there is no interference during the entire core-pulling process and minimizing the space requirements.

[0012] Furthermore, the first core-pulling group includes a first rotating shaft and a first drive gear and a first rotating plate disposed on the first rotating shaft; the second core-pulling group includes a second rotating shaft and a second drive gear and a second rotating plate disposed on the second rotating shaft; the third core-pulling group includes a third rotating shaft and a third drive gear and a third rotating plate disposed on the third rotating shaft; and the fourth core-pulling group includes a fourth rotating shaft and a fourth drive gear and a fourth rotating plate disposed on the fourth rotating shaft. The first drive gear meshes with the first transition gear, the second drive gear meshes with the third transition gear, the third drive gear meshes with the second transition gear, and the fourth drive gear meshes with the fourth transition gear. By configuring an independent rotating shaft, drive gear, and rotating plate for each core-pulling group, and establishing a gear meshing transmission chain between the core-pulling group and the transmission assembly, accurate power distribution and motion synchronization of the four core-pulling mechanisms are achieved, ensuring coordinated core-pulling actions of each bent tube insert. Furthermore, the modular design improves maintenance convenience.

[0013] Furthermore, the drive assembly includes a drive component, a slide rail, and a bent-tube core-pulling slider. The drive component is connected to the bent-tube core-pulling slider to drive the slider to reciprocate on the slide rail. The bent-tube core-pulling slider is provided with a first connecting rod connected to the first core-pulling group and a second connecting rod connected to the second core-pulling group. The drive assembly drives the bent-tube core-pulling slider to move linearly along the slide rail through the drive component, and uses the first and second connecting rods to convert the linear motion into the rotational motion of the first and second core-pulling groups. This achieves the effect of a single power source simultaneously driving two sets of core-pulling mechanisms, simplifying the drive structure, reducing energy consumption and space occupation, and ensuring the reliability and synchronization accuracy of motion transmission through mechanical rigid connection, avoiding the problems of poor synchronization and large space occupation of traditional multi-cylinder drive systems.

[0014] Furthermore, both the first and second connecting rods are arc-shaped and have rotating shafts at both ends, allowing both to rotate around these shafts. By employing arc-shaped connecting rods with rotating shafts at both ends, the conversion from linear motion to rotational motion is achieved. The arc-shaped structure optimizes the lever arm length and motion trajectory, enabling the core-pulling assembly to obtain stable torque output and improving the smoothness of the core-pulling action.

[0015] Furthermore, the first, second, third, and fourth core-pulling groups all include a linear core-pulling group, which is connected to the bent pipe insert and used to drive the bent pipe insert to move in a linear direction. By adding a linear core-pulling group to the core-pulling group, a compound core-pulling action of the bent pipe insert is achieved: first, the core-pulling of the bent pipe socket section is completed through linear motion, and then the core-pulling of the bent pipe arc section is released through rotational motion, thereby improving core-pulling efficiency and product forming quality.

[0016] Furthermore, the linear core-pulling assembly includes a linear core-pulling slider and an inclined guide post that drives the linear core-pulling slider to move linearly. The bent tube insert is connected to the linear core-pulling slider. The inclined guide post is disposed on the upper mold assembly. The linear core-pulling slider has a guide hole that mates with the inclined guide post. When the upper mold assembly and the lower mold assembly open, the inclined guide post drives the linear core-pulling slider away from the cavity. The inclined guide post is fixed to the upper mold, converting the stroke of the mold opening action into the linear motion of the linear core-pulling slider. No additional power source is required. Through the cooperation of the inclined guide post and the guide hole, the function of automatically driving the bent tube insert to complete the linear core-pulling is realized when the mold opens, reducing energy consumption and maintenance costs.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The first and second core-pulling groups are driven by a single drive component, and the third and fourth core-pulling groups are driven to rotate in opposite directions by a transmission component, so as to realize the synchronous rotation and demolding of the four-cavity bent tube insert, which ensures production efficiency while significantly reducing production energy consumption and equipment costs.

[0019] 2. No need to install multiple sets of hydraulic cylinders, optimize the spatial layout of production equipment, significantly reduce the space occupied, and will not interfere with the structure of machine base baffles, safety doors, etc.;

[0020] 3. First, straight core pulling is performed by demolding force, and then multiple sets of rotating plates are controlled to rotate synchronously to complete the core pulling of the bent pipe, so as to achieve precise demolding in stages and adapt to large-arc bend structures. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a four-cavity elbow synchronous core-pulling device.

[0022] Figure 2 This is a schematic diagram of the core-pulling state of a four-cavity elbow synchronous core-pulling device.

[0023] Figure 3 This is a schematic diagram of the transmission assembly and the core-pulling assembly. The arrows in the diagram indicate the direction of rotation.

[0024] In the attached diagram: 100, lower mold assembly; 110, cavity; 120, bent tube insert; 200, drive assembly; 210, drive component; 220, slide rail; 230, bent tube core-pulling slider; 240, first connecting rod; 250, second connecting rod; 260, rotating shaft; 300, transmission assembly; 310, first transmission group; 311, first transition gear; 312, second transition gear; 320, second transmission group; 321, third transition gear; 322, fourth transition gear; 400, core-pulling assembly; 410, first... Core pulling assembly; 411, First rotating shaft; 412, First drive gear; 413, First rotating plate; 420, Second core pulling assembly; 421, Second rotating shaft; 422, Second drive gear; 423, Second rotating plate; 430, Third core pulling assembly; 431, Third rotating shaft; 432, Third drive gear; 433, Third rotating plate; 440, Fourth core pulling assembly; 441, Fourth rotating shaft; 442, Fourth drive gear; 443, Fourth rotating plate; 450, Linear core pulling assembly; 451, Linear core pulling slider; 452, Guide hole. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] Example 1

[0028] This embodiment is a first embodiment of a four-cavity elbow synchronous core-pulling device, including an upper mold assembly, a lower mold assembly 100, a drive assembly 200, a transmission assembly 300, and a core-pulling assembly 400. A cavity 110 is provided between the upper mold assembly and the lower mold assembly 100. A bending pipe insert 120 is provided in the cavity 110. The bending pipe insert 120 is connected to the core-pulling assembly 400. The core-pulling assembly 400 and the transmission assembly 300 are both rotatably connected to the lower mold assembly 100. The core-pulling assembly 400 includes a first core-pulling group 410, a second core-pulling group 420, a third core-pulling group 430, and a fourth core-pulling group 440. The first core-pulling group 410 and the second core-pulling group 420 are connected to the drive assembly 200. The transmission assembly 300 is disposed between the first core-pulling group 410 and the third core-pulling group 430 and between the second core-pulling group 420 and the fourth core-pulling group 440.

[0029] like Figure 1 As shown, the synchronous core-pulling device for a four-cavity elbow of this utility model first completes the forming of the elbow fitting in the cavity 110 between the upper mold assembly and the lower mold assembly 100. Then, the drive assembly 200 drives the first core-pulling group 410 and the second core-pulling group 420 to move, while the transmission assembly 300 transmits power to the third core-pulling group 430 and the fourth core-pulling group 440, causing the elbow insert 120 to be released from the elbow fitting. Thus, by driving four core-pulling groups with a single drive assembly 200, the synchronous rotation and demolding of the four-cavity elbow insert 120 is achieved, ensuring production efficiency while significantly reducing production energy consumption and equipment costs.

[0030] like Figure 2 , Figure 3 As shown, in this embodiment, the first core-pulling group 410 and the fourth core-pulling group 440 rotate in the same direction, the second core-pulling group 420 and the third core-pulling group 430 rotate in the same direction, and the first core-pulling group 410 and the second core-pulling group 420 rotate in opposite directions. The first core-pulling group 410 and the fourth core-pulling group 440 rotate in the same direction, the second core-pulling group 420 and the third core-pulling group 430 rotate in the same direction, and the first core-pulling group 410 and the second core-pulling group 420 maintain opposite movements. This allows the four-cavity bent tube insert 120 to complete interference-free synchronous rotation core pulling within a limited space, avoiding motion conflicts and maximizing the use of mold space, providing a structural basis for realizing the drive of the single drive component 200. In this embodiment, the drive component 200 can be selected as a hydraulic cylinder located on the top side of the injection molding machine.

[0031] The transmission assembly 300 in this embodiment includes a first transmission group 310 disposed between the first core-pulling group 410 and the third core-pulling group 430, and a second transmission group 320 disposed between the second core-pulling group 420 and the fourth core-pulling group 440. Through a group linkage design, the transmission assembly 300 is respectively disposed between the first core-pulling group 410 and the third core-pulling group 430, and between the second core-pulling group 420 and the fourth core-pulling group 440. This decomposes the driving force input by a single drive assembly 200 into two sets of driving forces that respectively drive the movement of the third core-pulling group 430 and the fourth core-pulling group 440, ensuring that the four sets of bent tube inserts 120 can complete synchronous core-pulling actions.

[0032] like Figure 3 As shown, in this embodiment, the first transmission group 310 includes a first transition gear 311 and a second transition gear 312 that mesh with each other. The first transition gear 311 meshes with the first core-pulling group 410, and the second transition gear 312 meshes with the third core-pulling group 430. The second transmission group 320 includes a third transition gear 321 and a fourth transition gear 322 that mesh with each other. The third transition gear 321 meshes with the second core-pulling group 420, and the fourth transition gear 322 meshes with the fourth core-pulling group 440.

[0033] In this embodiment, the rotation axes of the first core-pulling group 410, the second core-pulling group 420, the third core-pulling group 430, and the fourth core-pulling group 440 coincide with the center of the corresponding circle of the bending pipe insert 120. By aligning the rotation axes of each core-pulling group with the center of the circle of the bending pipe insert 120, the motion trajectory of the rotating core-pulling is precisely matched with the curvature of the bending pipe, thereby ensuring that there is no interference in the entire bending pipe core-pulling process and minimizing the motion space requirements.

[0034] like Figure 3As shown, the first core-pulling assembly 410 includes a first rotating shaft 411 and a first drive gear 412 and a first rotating plate 413 disposed on the first rotating shaft 411; the second core-pulling assembly 420 includes a second rotating shaft 421 and a second drive gear 422 and a second rotating plate 423 disposed on the second rotating shaft 421; the third core-pulling assembly 430 includes a third rotating shaft 431 and a third drive gear 432 and a third rotating plate 433 disposed on the third rotating shaft 431; and the fourth core-pulling assembly 440 includes a fourth rotating shaft 441 and a fourth drive gear 442 and a fourth rotating plate 443 disposed on the fourth rotating shaft 441. The first drive gear 412 meshes with the first transition gear 311; the second drive gear 422 meshes with the third transition gear 321; the third drive gear 432 meshes with the second transition gear 312; and the fourth drive gear 442 meshes with the fourth transition gear 322. By configuring each core-pulling group with an independent rotating shaft, drive gear, and rotating plate, and establishing a gear meshing transmission chain between the core-pulling group and the transmission assembly 300, the power distribution and motion synchronization of the four core-pulling mechanisms are realized, ensuring that the rotational core-pulling actions of each bent tube insert 120 are coordinated and consistent. Furthermore, the modular design improves the convenience of maintenance.

[0035] Example 2

[0036] This embodiment is the second embodiment of a four-cavity elbow synchronous core-pulling device. This embodiment is similar to the first embodiment, except that, as Figure 1 , Figure 2 As shown, the drive assembly 200 includes a drive component 210, a slide rail 220, and a bent tube core-pulling slider 230. The drive component 210 is connected to the bent tube core-pulling slider 230 to drive the bent tube core-pulling slider 230 to reciprocate on the slide rail 220. The bent tube core-pulling slider 230 is provided with a first connecting rod 240 connected to the first core-pulling group 410 and a second connecting rod 250 connected to the second core-pulling group 420. The drive assembly 200 drives the bent tube core-pulling slider 230 to move linearly along the slide rail 220 through the drive component 210, and uses the first connecting rod 240 and the second connecting rod 250 to convert the linear motion into the rotational motion of the first core-pulling group 410 and the second core-pulling group 420. This achieves the effect of a single power source driving two sets of core-pulling mechanisms simultaneously, simplifies the drive structure, reduces energy consumption and space occupation, and ensures the reliability and synchronization accuracy of motion transmission through mechanical rigid connection, avoiding the problems of poor synchronization and large space occupation of traditional multi-cylinder drive systems.

[0037] like Figure 1 , Figure 2As shown, in this embodiment, both the first link 240 and the second link 250 are arc-shaped and have a rotating shaft 260 at both ends. Both the first link 240 and the second link 250 can rotate around the rotating shaft 260. By using arc-shaped links with rotating shafts 260 at both ends, the conversion from linear motion to rotational motion is achieved. The arc-shaped structure optimizes the lever arm length and motion trajectory, enabling the core-pulling assembly to obtain a stable torque output and improving the smoothness of the core-pulling action.

[0038] Example 3

[0039] This embodiment is the second embodiment of a four-cavity elbow synchronous core-pulling device. This embodiment is similar to the first embodiment, except that the first core-pulling group 410, the second core-pulling group 420, the third core-pulling group 430, and the fourth core-pulling group 440 all include a linear core-pulling group 450. The linear core-pulling group 450 is connected to the elbow insert 120 and is used to drive the elbow insert 120 to move in a linear direction. By adding the linear core-pulling group 450 to the core-pulling group, a composite core-pulling action of the elbow insert 120 is achieved: first, the core-pulling of the elbow socket section is completed through linear motion, and then the core-pulling of the elbow arc section is released through rotational motion, improving core-pulling efficiency and product molding quality.

[0040] like Figure 1 , Figure 2 As shown, the linear core-pulling assembly 450 in this embodiment includes a linear core-pulling slider 451 and an inclined guide post that drives the linear core-pulling slider 451 to move linearly. The bent tube insert 120 is connected to the linear core-pulling slider 451. The inclined guide post is disposed on the upper mold assembly. The linear core-pulling slider 451 is provided with a guide hole 452 that cooperates with the inclined guide post. When the upper mold assembly and the lower mold assembly 100 open, the inclined guide post drives the linear core-pulling slider 451 away from the cavity 110. The inclined guide post is fixed to the upper mold, converting the stroke of the mold opening action into the linear motion of the linear core-pulling slider 451. No additional power source is required. Through the cooperation of the inclined guide post and the guide hole 452, the function of automatically driving the bent tube insert 120 to complete the linear core-pulling is realized when the mold opens, reducing energy consumption and maintenance costs.

[0041] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A four-cavity simultaneous core-pulling device for a one-out-four elbow, characterized in that, The assembly includes an upper mold assembly, a lower mold assembly (100), a drive assembly (200), a transmission assembly (300), and a core-pulling assembly (400). A cavity (110) is provided between the upper mold assembly and the lower mold assembly (100). A bent tube insert (120) is provided in the cavity (110). The bent tube insert (120) is connected to the core-pulling assembly (400). Both the core-pulling assembly (400) and the transmission assembly (300) are rotatably connected to the lower mold assembly (100). The core-pulling assembly (400) includes a first core-pulling group (410), a second core-pulling group (420), a third core-pulling group (430), and a fourth core-pulling group (440). The first core-pulling group (410) and the second core-pulling group (420) are connected to the drive assembly (200). The transmission assembly (300) is disposed between the first core-pulling group (410) and the third core-pulling group (430) and between the second core-pulling group (420) and the fourth core-pulling group (440).

2. The one-to-four cavity elbow synchronous core-pulling apparatus according to claim 1, wherein, The first core-pulling group (410) and the fourth core-pulling group (440) rotate in the same direction, the second core-pulling group (420) and the third core-pulling group (430) rotate in the same direction, and the first core-pulling group (410) and the second core-pulling group (420) rotate in opposite directions.

3. The synchronous core-pulling device for a four-cavity elbow as described in claim 1, characterized in that, The transmission assembly (300) includes a first transmission group (310) disposed between the first core-pulling group (410) and the third core-pulling group (430), and a second transmission group (320) disposed between the second core-pulling group (420) and the fourth core-pulling group (440).

4. The one-to-four-cavity elbow synchronous core-pulling apparatus according to claim 3, wherein The first transmission group (310) includes a first transition gear (311) and a second transition gear (312) meshing with each other. The first transition gear (311) meshes with the first core-pulling group (410), and the second transition gear (312) meshes with the third core-pulling group (430). The second transmission group (320) includes a third transition gear (321) and a fourth transition gear (322) meshing with each other. The third transition gear (321) meshes with the second core-pulling group (420), and the fourth transition gear (322) meshes with the fourth core-pulling group (440).

5. The one-to-four-cavity elbow synchronous core-pulling apparatus according to claim 4, wherein The rotation axes of the first core-pulling group (410), the second core-pulling group (420), the third core-pulling group (430) and the fourth core-pulling group (440) coincide with the center of the circle corresponding to the bent pipe insert (120).

6. The one-to-four-cavity elbow synchronous core-pulling apparatus according to claim 5, wherein The first core-pulling assembly (410) includes a first rotating shaft (411) and a first drive gear (412) and a first rotating plate (413) disposed on the first rotating shaft (411). The second core-pulling assembly (420) includes a second rotating shaft (421) and a second drive gear (422) and a second rotating plate (423) disposed on the second rotating shaft (421). The third core-pulling assembly (430) includes a third rotating shaft (431) and a third drive gear (432) and a third rotating plate (433) disposed on the third rotating shaft (431). 3) The fourth core-pulling assembly (440) includes a fourth rotating shaft (441) and a fourth drive gear (442) and a fourth rotating plate (443) disposed on the fourth rotating shaft (441). The first drive gear (412) meshes with the first transition gear (311), the second drive gear (422) meshes with the third transition gear (321), the third drive gear (432) meshes with the second transition gear (312), and the fourth drive gear (442) meshes with the fourth transition gear (322).

7. The four-cavity elbow synchronous core-pulling apparatus according to any one of claims 1 to 6, characterized in that, The drive assembly (200) includes a drive member (210), a slide rail (220), and a bent tube core-pulling slider (230). The drive member (210) is connected to the bent tube core-pulling slider (230) to drive the bent tube core-pulling slider (230) to reciprocate on the slide rail (220). The bent tube core-pulling slider (230) is provided with a first connecting rod (240) connected to the first core-pulling group (410) and a second connecting rod (250) connected to the second core-pulling group (420).

8. The one-to-four-cavity elbow synchronous core-pulling apparatus according to claim 7, wherein Both the first link (240) and the second link (250) are arc-shaped and have a rotating shaft (260) at both ends. Both the first link (240) and the second link (250) can rotate around the rotating shaft (260).

9. The four-cavity elbow synchronous core-pulling apparatus according to any one of claims 1 to 6, characterized by The first core-pulling group (410), the second core-pulling group (420), the third core-pulling group (430) and the fourth core-pulling group (440) all include a straight core-pulling group (450), which is connected to the bent pipe insert (120) and is used to drive the bent pipe insert (120) to move in a straight direction.

10. The one-to-four-cavity elbow synchronous core-pulling apparatus according to claim 9, wherein The linear core-pulling assembly (450) includes a linear core-pulling slider (451) and an inclined guide post that drives the linear core-pulling slider (451) to move linearly. The bent tube insert (120) is connected to the linear core-pulling slider (451). The inclined guide post is disposed on the upper mold assembly. The linear core-pulling slider (451) is provided with a guide hole (452) that cooperates with the inclined guide post. When the upper mold assembly and the lower mold assembly (100) open the mold, the inclined guide post drives the linear core-pulling slider (451) away from the cavity (110).

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