Large arc core-pulling mechanism

Abstract

Core pulling pieces are arranged on the two sides of an injection molding piece side by side, one end of each core pulling piece is provided with a pressing cylinder, the other end of each core pulling piece is provided with a supporting block, the supporting blocks support the injection molding piece, the supporting blocks and the core pulling pieces are integrally of a bent structure, one side of a connecting block is provided with a first fixing block, and the first fixing block is fixed through a first fastening piece and a second fastening piece; the core-pulling piece comprises an outer plate and an inner plate, arc-shaped sliding grooves and transverse sliding grooves are formed in the outer plate and the inner plate, the arc-shaped sliding grooves are connected to the two sides of the first fixing block, one end of the first fixing block is a connector connected with the bidirectional connecting plate, and the other end of the bidirectional connecting plate is connected with the second fixing block. The whole device is of a bent structure, overall stress distribution is more uniform, and the device is not prone to deformation after being used for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to a large arc core pulling mechanism. Background Art

[0002] A chair is a kind of furniture in daily life. Cavities need to be processed on both sides of the chair backrest during production, so it is necessary to design a core-pulling mechanism for the chair backrest.

[0003] In the prior art, the core-pulling ejection mechanism of the imitation rattan plastic chair back disclosed in the patent publication number CN208118337U includes an upper and a lower composite plate, a mold insert is set in the template under the upper composite plate, a mold foot is arranged on the lower composite plate, an upper ejector plate, a lower ejector plate, a straight ejector and an inclined ejector are arranged on the lower composite plate between the mold feet, a movable mold plate is arranged on the mold foot, an ejection oil cylinder is arranged on the side wall of the movable mold plate, a movable mold insert and an outer core-pulling slider are arranged on the movable mold insert, an inner core-pulling slider is arranged on the movable mold insert, the inclined ejector cooperates with the outer core-pulling slider and the inner core-pulling slider, the fixed mold insert, the movable mold insert, the outer core-pulling slider and the inner core-pulling slider are matched, There is an injection-molded rattan-like plastic chair backrest between the slider and the inner core-pulling slider, and arc-shaped hollow reinforcing columns are formed on both sides of the rattan-like plastic chair backrest. It is characterized in that a mounting seat is arranged on the movable template, and the front side of the mounting seat cooperates with the bottom of the rattan-like plastic chair backrest, the rear side of the mounting seat is connected to the side top cylinder, and the lower side of the movable template is connected to the upper top cylinder, and the left and right sides of the movable template are respectively connected to the reinforcing column core-pulling rods that cooperate with the arc-shaped hollow reinforcing columns of the rattan-like plastic chair backrest. The overall core-pulling structure of this comparative technology is a linear structure, which is prone to deformation and breakage after long-term use, has a short lifespan, and is not conducive to mass production. Summary of the invention

[0004] The purpose of the present invention is to solve the problems that the existing large arc core pulling mechanism is not stable as a whole, is prone to deformation and breakage during long-term use, and has poor rigidity, and to provide a large arc core pulling mechanism which is curved as a whole.

[0005] Another object of the present invention is to solve the problem that the existing large arc core pulling mechanism has only a single linear slide groove, which is prone to jamming after long-term use. The present invention provides an arc track and can rotate in all directions at the same time, providing a large arc core pulling mechanism that will not get stuck and has a smooth travel.

[0006] Another purpose of the present invention is to solve the problem that the existing large arc core pulling mechanism is easy to damage and difficult to maintain. The core pulling structure of the present invention is simple and easy to disassemble, providing a large arc core pulling mechanism that is easy to maintain and detachable.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large arc core pulling mechanism, core pulling parts are arranged in parallel on both sides of the injection molded part, one end of the core pulling part is a pressure cylinder, and the other end of the core pulling part is a support block, the support block supports the injection molded part, and the support block and the core pulling part are a curved structure as a whole.

[0008] Preferably, one side of the connecting block is a first fixing block, and the first fixing block is fixed by a first fastener and a second fastener.

[0009] Preferably, the core-pulling component comprises an outer plate and an inner plate, and the outer plate and the inner plate are provided with an arc-shaped slide groove and a transverse slide groove.

[0010] Preferably, arc-shaped slide grooves are connected on both sides of the first fixing block, one end of the first fixing block is a connecting port connected to a bidirectional connecting plate, and the other end of the bidirectional connecting plate is connected to the second fixing block.

[0011] Preferably, the second fixing block is arranged in the middle of the sliding block, and the sliding block is a U-shaped structure as a whole and is embedded in the transverse sliding groove.

[0012] Preferably, the pressure cylinder drives the sliding block to drive the first fixed block to slide along the arc-shaped sliding groove.

[0013] Preferably, an upper fixed block is disposed above the slide block, one end of the core pulling member is a side fixed block, and a pressure cylinder assembly is disposed below the core pulling member.

[0014] Preferably, a limiting groove is provided in the connecting block, and one end of the supporting block is a limiting block embedded in the limiting groove.

[0015] Preferably, one end of the support block is an L-shaped bayonet fixed on the connecting block, and one side of the L-shaped bayonet is a supporting inclined surface.

[0016] Preferably, a positioning piece is provided between the support block and the injection molded part, and the positioning piece is an L-shaped structure and is closely attached to the support block.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the parts of the core pulling mechanism of the present invention can be easily disassembled, which is convenient for replacement and maintenance; the core pulling part of the present invention can be universally rotated, is not easy to get stuck after working for a long time, and the overall operation is smoother; the present invention has a curved structure as a whole, the overall stress distribution is more uniform, and is not easy to deform after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0019] Figure 2 It is a partial enlarged view C of the present invention.

[0020] Figure 3 It is a schematic diagram of the core-pulling part of the present invention.

[0021] Figure 4 It is a partial enlarged view D of the present invention.

[0022] Figure 5 It is a top view of the core pulling part of the present invention.

[0023] Figure 6 This is the cross-sectional view AA of the core pulling part of the present invention.

[0024] Figure 7 It is a partial enlarged view E of the core pulling part of the present invention.

[0025] Figure 8 It is the cross-sectional view BB of the present invention.

[0026] In the figure: 1. Cylinder assembly; 2. Core pulling part; 3. Pressure rod; 4. Injection molded part; 5. Support block; 6. Positioning piece; 7. L-shaped bayonet; 8. Connecting block; 9. Slider; 10. Outer plate; 11. Inner plate; 12. Side fixing block; 13. Two-way connecting plate; 14. Support slope; 15. Horizontal slide; 16. First fixing block; 17. First fastener; 18. Connecting port; 19. Second fixing block; 20. Upper fixing block; 21. Arc slide; 22. Limit block; 23. Second fastener; 24. Limit groove. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below through specific embodiments and in combination with the accompanying drawings. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Example 1: Reference Figures 1 to 8 A large arc core pulling mechanism, core pulling pieces 2 are arranged side by side on both sides of the injection molded part 4, and one end of each core pulling piece 2 is connected to a pressure cylinder 3, which is the power source of the core pulling piece 2. The pressure cylinder 3 can be a gas pressure or hydraulic device. The pressure cylinder 3 generates thrust by compressing gas or liquid, so that the core pulling piece 2 can perform telescopic movement, so as to be pulled out from the injection molded part. A support block 5 is connected to the other end of the core pulling piece 2. The function of the support block 5 is to support the gap of the injection molded part 4, maintain the stability of the injection molded part, and prevent accidental sliding or collapse during the extraction process. The support block 5 and the core pulling piece 2 are designed as a curved structure as a whole. The overall structural stress distribution is uniform, which is more stable during the core pulling process, and the entire core pulling structure is not easy to break or deform.

[0029] On one side of the connecting block 8, a first fixing block 16 is provided, and its main function is to fix the position of the connecting block 8 and ensure the stability of the entire core pulling mechanism. The first fixing block 16 is fixed by a first fastener 17 and a second fastener 23. Such a design not only ensures the firmness of the first fixing block 16, but also facilitates installation and maintenance. The first fastener 17 and the second fastener 23 can be bolts, screws or other types of fasteners, and they are threadedly matched to ensure that the first fixing block 16 will not loosen during long-term use.

[0030] The core puller 2 is a key component in the large arc core puller mechanism of the present invention. It consists of two parts, the outer plate 10 and the inner plate 11. The design and coordination of these two parts are crucial to the functionality of the entire mechanism. The outer plate 10 and the inner plate 11 are respectively provided with an arc chute 21 and a transverse chute 15. The design and layout of these chute have a significant impact on the movement characteristics of the core puller 2.

[0031] The design of the arcuate chute 21 takes into special consideration the smoothness and stability of the movement. Due to its curved structure, the arcuate chute 21 provides a smooth guide path when the core pulling member 2 is extended and retracted, which not only makes the movement more flexible, but also reduces the risk of misalignment or jamming that may occur due to linear motion. In addition, the curved shape of the arcuate chute 21 helps to disperse pressure, reduce friction and wear, and thus extend the service life of the mechanism. In actual use, this design also helps to reduce noise. The transverse chute 15 provides the core pulling member 2 with sliding freedom in another direction, and combined with the arcuate chute 21, the core pulling action of the core pulling member 2 is more precise.

[0032] The first fixed block 16 is connected to arc-shaped grooves 21 on both sides and slides in the arc-shaped grooves 21. This design enables the first fixed block 16 to work in conjunction with the core-pulling member 2 to achieve smoother movement. This synergy ensures the stability and synchronization of the core-pulling member 2 during the telescopic process, further enhancing the reliability of the entire mechanism. A connection port 18 is provided at one end of the first fixed block 16, and the connection port 18 is used to connect the two-way connecting plate 13, connecting the first fixed block 16 and the second fixed block 1. This design allows the two-way connecting plate 13 to achieve a universal rotating structure, making the core pulling of the entire mechanism smoother and not stuck.

[0033] Example 2: Reference Figures 1 to 8 A large arc core pulling mechanism, core pulling pieces 2 are arranged on both sides of the injection molded part 4, and one end of each core pulling piece 2 is connected to a pressure cylinder 3. The pressure cylinder 3 can be a pneumatic or hydraulic device, which generates thrust by compressing gas or liquid, so that the core pulling piece 2 can perform telescopic movement and realize the function of being pulled out from the injection molded part. A support block 5 is connected to the other end of the core pulling piece 2. The function of the support block 5 is to support the gap of the injection molded part 4, maintain the stability of the injection molded part, and prevent accidental sliding or collapse during the extraction process. The support block 5 and the core pulling piece 2 are designed as a curved structure as a whole, so that the stress distribution of the overall structure is uniform, it is more stable during the core pulling process, and the entire core pulling structure is not easy to break or deform.

[0034] On one side of the connecting block 8, a first fixing block 16 is provided, and its main function is to fix the position of the connecting block 8 and ensure the stability of the entire core pulling mechanism. The first fixing block 16 is fixed by a first fastener 17 and a second fastener 23. Such a design not only ensures the firmness of the first fixing block 16, but also facilitates installation and maintenance. The first fastener 17 and the second fastener 23 can be bolts, screws or other types of fasteners, which are threaded to ensure that the first fixing block 16 will not loosen during long-term use.

[0035] The core pulling member 2 is a key component in the large arc core pulling mechanism of the present invention. It consists of two parts, the outer plate 10 and the inner plate 11. The design and coordination of these two parts are crucial to the functionality of the entire mechanism. The outer plate 10 and the inner plate 11 are respectively provided with an arc chute 21 and a transverse chute 15. The design and layout of these chute have a significant impact on the motion characteristics of the core pulling member 2. The design of the arc chute 21 takes into account the smoothness and stability of the movement. Due to its curved structure, it provides a smooth guide path when the core pulling member 2 is extended and retracted, making the movement more flexible and reducing the risk of misalignment or jamming that may be caused by linear motion. In addition, the curved shape of the arc chute 21 helps to disperse pressure, reduce friction and wear, and thus extend the service life of the mechanism. In actual use, this design also helps to reduce noise. The transverse chute 15 provides the core pulling member 2 with another degree of sliding freedom in another direction. Combined with the arc chute 21, the core pulling action of the core pulling member 2 is more precise.

[0036] The first fixed block 16 is connected to arc-shaped grooves 21 on both sides and slides in the arc-shaped grooves 21. This design enables the first fixed block 16 to work in conjunction with the core-pulling member 2 to achieve smoother movement. This synergy ensures the stability and synchronization of the core-pulling member 2 during the expansion and contraction process, further enhancing the reliability of the entire mechanism. A connection port 18 is provided at one end of the first fixed block 16, and the connection port 18 is used to connect the two-way connecting plate 13. The two-way connecting plate 13 realizes a universal rotating structure, which makes the core pulling of the overall mechanism smoother and will not get stuck, and provides more flexibility and adjustment capabilities to adapt to different injection molding structures and core pulling requirements.

[0037] The second fixed block 19 is located at the center of the slider 9, and the U-shaped design of the slider 9 enhances its structural strength and enables it to be tightly combined with the transverse slide 15, ensuring that the gap and vibration are reduced during the sliding process, thereby improving the stability and accuracy of the core pulling mechanism. The pressure cylinder 3 serves as a power source to drive the slider 9 and accurately control the core pulling action. The movement of the slider 9 drives the first fixed block 16 to slide along the arc-shaped slide 21. The design of the arc-shaped slide 21 pays special attention to the smoothness and stability of the movement, so that the first fixed block 16 can move smoothly during the core pulling process, effectively avoiding the misalignment or jamming problems that may be caused by linear motion.

[0038] The upper fixed block 20 is arranged above the slider 9, which plays a guiding role, making it difficult for the sliding to be misplaced and further enhancing the stability of the overall structure. One end of the core puller 2 is connected to the side fixed block 12, and the other end is connected to the cylinder assembly 1. Such a layout enables the core puller 2 to perform effective telescopic movement under the drive of the cylinder 3. The cooperation between the side fixed block 12 and the cylinder assembly 1 not only provides the necessary support and connection, but also ensures the stability and synchronization of the core puller 2 during the movement, which is crucial to the reliability of the entire mechanism.

[0039] Overall, the design of this large arc core-pulling mechanism achieves efficient, stable and reliable core-pulling action through the coordinated work of various components, ensuring the safety and comfort of the chair during use, while also improving the durability of the mechanism and the ease of maintenance.

[0040] Example 3: Reference Figures 1 to 8 A large arc core pulling mechanism, the core pulling parts 2 located on both sides of the injection molded part 4, one end of which is connected to a pressure cylinder 3. The pressure cylinder 3 serves as the power source of the core pulling part 2, and can be a pneumatic or hydraulic system. The power is generated by the compression of gas or liquid to drive the core pulling part 2 to perform a telescopic action to achieve the function of pulling it out of the injection molded part. The other end of the core pulling part 2 is connected to the support block 5. The function of the support block 5 is to support the gap of the injection molded part 4 during the extraction process, maintain the stability of the injection molded part, and prevent the injection molded part from sliding or collapsing due to the extraction action. The support block 5 and the core pulling part 2 together form a curved structure, which makes the stress distribution of the entire structure more uniform, enhances the stability during the core pulling process, and reduces the risk of structural breakage or deformation.

[0041] On one side of the connecting block 8, a first fixing block 16 is installed, and its main function is to stabilize the connecting block 8 and ensure the stability of the entire core pulling mechanism. The first fixing block 16 is fixed by a first fastener 17 and a second fastener 23. This design not only ensures the stability of the first fixing block 16, but also facilitates subsequent installation and maintenance work. The first fastener 17 and the second fastener 23 may be bolts, screws or other fasteners, which are connected by threads to ensure that the first fixing block 16 remains fastened during long-term use and is not easy to loosen.

[0042] The core pulling member 2, as a key component of the large arc core pulling mechanism in the present invention, is composed of an outer plate 10 and an inner plate 11. The design and coordination of these two parts are crucial to the function of the mechanism. The outer plate 10 and the inner plate 11 are respectively provided with an arc-shaped slide 21 and a transverse slide 15. The design and layout of these slides have a significant impact on the movement characteristics of the core pulling member 2. The design of the arc-shaped slide 21 pays special attention to the smoothness and stability of the movement. Its curved structure provides a smooth guiding path for the extension and contraction of the core pulling member 2, increases the flexibility of movement, and reduces the risk of misalignment or jamming that may be caused by linear motion. The curved shape of the arc-shaped slide 21 helps to disperse pressure, reduce friction and wear, extend the service life of the mechanism, and help reduce noise in actual use. The transverse slide 15 provides sliding freedom in another direction, and combined with the arc-shaped slide 21, improves the accuracy of the core pulling action of the core pulling member 2.

[0043] The first fixed block 16 is provided with arc-shaped grooves 21 on both sides, and slides in the arc-shaped grooves 21. Such a design enables the first fixed block 16 to work in conjunction with the core-pulling member 2 to achieve smoother movement. This synergy ensures the stability and synchronization of the core-pulling member 2 during the expansion and contraction process, and enhances the reliability of the entire mechanism. A connection port 18 is provided at one end of the first fixed block 16, and the connection port 18 is used to connect the two-way connecting plate 13. This design enables the two-way connecting plate 13 to achieve universal rotation, so that the overall mechanism is smoother during core pulling, avoiding the problem of jamming, and providing more flexibility and adjustment capabilities to adapt to different injection molding structures and core pulling requirements.

[0044] The second fixed block 19 is located at the center of the slider 9. This layout not only optimizes the force transmission path, but also significantly enhances its structural strength and stability due to the U-shaped design of the slider 9. The close combination of the U-shaped slider 9 and the transverse slide 15 ensures a close fit during the sliding process, effectively reducing the gap and vibration, which is crucial to improving the stability and accuracy of the core pulling mechanism. The pressure cylinder 3, as the power source of the core pulling mechanism, drives the slider 9 through its precise pressure control, thereby accurately controlling the core pulling action and ensuring the efficiency and reliability of the core pulling process.

[0045] The movement of the slider 9 not only drives the first fixed block 16 to slide along the arc-shaped slide groove 21, but also the design of the arc-shaped slide groove 21 pays special attention to the smoothness and stability of the movement. This design enables the first fixed block 16 to move smoothly during the core pulling process, effectively avoiding the misalignment or jamming problems that may be caused by linear motion, and improving the working efficiency and life of the mechanism. The upper fixed block 20 is set above the slider 9, which plays a guiding role, making it difficult to slide and misalign, and further enhancing the stability of the overall structure, which is crucial to ensure the stability and reliability of the core pulling mechanism during long-term use.

[0046] One end of the core puller 2 is connected to the side fixing block 12, which ensures that the core puller 2 has a stable fixing point when performing telescopic movement, and the other end is connected to the cylinder assembly 1, which is the power source of the core puller 2. This layout enables the core puller 2 to perform effective telescopic movement under the drive of the cylinder 3, thereby achieving smooth extraction and insertion of the chair backrest.

[0047] The cooperation between the side fixing block 12 and the pressure cylinder assembly 1 not only provides the necessary support and connection, but also ensures the stability and synchronization of the core puller 2 during movement. The design of the side fixing block 12 takes into account the cooperation with the connection block 8, ensuring that the core puller 2 will not deviate or swing when extending and retracting, while the pressure cylinder assembly 1 provides stable power output and ensures precise control of the core puller 2. This precise control is crucial to the reliability of the entire mechanism because it directly affects the service life of the chair and the user experience.

[0048] In addition, this design also allows fine-tuning in different usage scenarios to adapt to different injection molded part structures and core pulling requirements. For example, the side fixing block 12 can adapt to injection molded parts of different thicknesses or shapes by adjusting the connection method or position with the connecting block 8. Similarly, the pressure cylinder assembly 1 can also provide different force outputs as needed to meet the needs of chairs of different weights. This flexibility and adjustability make the mechanism suitable not only for standardized production, but also for customized solutions.

[0049] In terms of material selection, the core puller 2, the side fixing block 12 and the pressure cylinder assembly 1 are all made of wear-resistant and corrosion-resistant materials to ensure that these key components can maintain their performance and structural integrity during long-term use. In addition, the surface treatment of these components has also been designed to reduce friction and wear, and improve the smoothness of movement and life.

[0050] In this embodiment, a limiting groove 24 is designed inside the connecting block 8 to ensure that the support block 5 can be accurately positioned and work stably. One end of the support block 5 is designed as a limiting block 22, and the limiting block 22 is cleverly embedded in the limiting groove 24 of the connecting block 8. This design not only ensures the accurate positioning of the support block 5 during the core pulling process, but also provides additional stability to prevent the support block 5 from being displaced under high pressure or accidental impact. The size and shape of the limiting groove 24 precisely match the limiting block 22, ensuring that the limiting block 22 can be tightly embedded therein to form a stable matching relationship.

[0051] The design of the limit groove 24 takes into account the structural strength and spatial layout of the connection block 8, so that it provides an effective limit function without affecting the overall strength of the connection block 8. The embedding method of the limit block 22 is simple and efficient. It can not only limit the movement of the support block 5, but also withstand greater forces during the core pulling process, thereby protecting the entire mechanism from damage. The material selection and geometric shape of the support block 5 have been carefully designed to ensure its strength and durability when subjected to pressure. The connection between the support block 5 and the limit block 22 has also been specially treated to ensure that the connection will not be worn or damaged during long-term use and repeated core pulling actions.

[0052] The other end of the support block 5 is designed as an L-shaped bayonet 7, which is fixed to the connecting block 8. The design of the L-shaped bayonet 7 enables the support block 5 to be firmly connected to the connecting block 8, while providing an easy-to-operate fixing method. One side of the L-shaped bayonet 7 is designed as a supporting inclined surface 14, which plays a supporting role when the support block 5 contacts the injection molded part 4, ensuring that the support block 5 can stably support the gap of the injection molded part 4 and prevent the injection molded part from sliding or collapsing during the extraction process.

[0053] In this embodiment, there is a positioning piece 6 between the support block 5 and the injection molded part 4, which enhances the stability and durability of the entire core pulling mechanism. The positioning piece 6 adopts an L-shaped structure. This design not only provides a stable contact surface, but also ensures that the support block 5 always maintains precise alignment with the injection molded part 4 during the core pulling process because it is close to the support block 5. This alignment is crucial to maintaining the stability of the injection molded part 4. The L-shaped structural design of the positioning piece 6 cleverly distributes the force applied by the support block 5 to a larger area of ​​the injection molded part 4, which can reduce the local pressure on any single point of the injection molded part 4. In addition, the surface treatment of the positioning piece 6 has also been specially designed to provide good friction characteristics, ensuring that the support block 5 will not be misplaced during the core pulling process, while reducing wear and improving the operating efficiency of the mechanism. This surface treatment also helps to reduce noise.

[0054] Combining these design features, this large arc core pulling mechanism not only improves the stability and reliability of the core pulling process, but also enhances the durability and convenience of maintenance of the entire mechanism through carefully designed components and structures. The coordinated work of the limit groove 24, the limit block 22, the L-shaped bayonet 7, the support slope 14 and the positioning piece 6 ensures the precise positioning and stable support of the support block 5 during the core pulling process, thereby improving the safety and comfort of the chair during use, and also making the entire core pulling mechanism more solid and durable.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A large arc core pulling mechanism, characterized in that: Core pulling parts (2) are arranged in parallel on both sides of the injection molded part (4); one end of the core pulling part (2) is a pressure cylinder (3); the other end of the core pulling part (2) is a support block (5); the support block (5) supports the injection molded part (4); the support block (5) and the core pulling part (2) are a curved structure as a whole.

2. A large arc core pulling mechanism according to claim 1, characterized in that: One side of the connection block (8) is a first fixing block (16), and the first fixing block (16) is fixed by a first fastener (17) and a second fastener (23).

3. A large arc core pulling mechanism according to claim 1 or 2, characterized in that: The core-pulling member (2) comprises an outer plate (10) and an inner plate (11), and the outer plate (10) and the inner plate (11) are provided with an arc-shaped sliding groove (21) and a transverse sliding groove (15).

4. A large arc core pulling mechanism according to claim 2, characterized in that: The first fixing block (16) is connected to arc-shaped sliding grooves (21) on both sides, one end of the first fixing block (16) is a connecting port (18) connected to the bidirectional connecting plate (13), and the other end of the bidirectional connecting plate (13) is connected to the second fixing block (19).

5. A large arc core pulling mechanism according to claim 4, characterized in that: The second fixed block (19) is arranged in the middle of the sliding block (9); the sliding block (9) is a U-shaped structure as a whole and is embedded in the transverse sliding groove (15).

6. A large arc core pulling mechanism according to claim 4 or 5, characterized in that: The pressure cylinder (3) drives the slide block (9) to drive the first fixed block (16) to slide along the arc-shaped slide groove (21).

7. A large arc core pulling mechanism according to claim 1, 4 or 5, characterized in that: An upper fixing block (20) is located above the slide block (9), a side fixing block (12) is located at one end of the core pulling member (2), and a cylinder assembly (1) is located below the core pulling member (2).

8. A large arc core pulling mechanism according to claim 2, characterized in that: A limiting groove (24) is provided in the connecting block (8), and a limiting block (22) is embedded in the limiting groove (24) at one end of the supporting block (5).

9. A large arc core pulling mechanism according to claim 8, characterized in that: One end of the support block (5) is an L-shaped bayonet (7) fixed on the connection block (8), and one side of the L-shaped bayonet (7) is a supporting inclined surface (14).

10. A large arc core pulling mechanism according to claim 1 or 9, characterized in that: A positioning piece (6) is provided between the support block (5) and the injection molded part (4); the positioning piece (6) is an L-shaped structure and is closely attached to the support block (5).

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