An arc-shaped core-pulling structure
Patent Information
- Application Number
- CN202522571695.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-03
AI Technical Summary
然而，此类直线运动机构无法直接驱动成型芯杆沿所需的弧形轨迹运动
[0014]与现有技术相比，本实用新型的优点和积极效果在于：
Smart Images
Figure CN224897950U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, and in particular to an arc-shaped core-pulling structure. Background Technology
[0002] In the field of injection mold technology, molding and demolding products with complex internal structures have always been technically challenging. For example... Figure 1 , Figure 2 The arc-shaped product 10 shown is arc-shaped overall, and has an arc-shaped inner cavity 101 that runs through both ends of the product. In the one-piece injection molding process of this type of product, an arc-shaped rod that matches the shape of the arc-shaped inner cavity 101 must be inserted into the mold cavity to participate in the molding process in order to form the arc-shaped inner cavity 101.
[0003] In existing technologies, common demolding and core-pulling mechanisms often employ linear motion, such as driving a slider to move linearly via inclined guide pillars, or using a hydraulic cylinder to directly pull the core rod out along a straight line. However, such linear motion mechanisms cannot directly drive the forming core rod to move along the required arc trajectory. Forcibly decomposing the arc-shaped core pulling into linear motion would result in an abnormally complex mechanism, large space occupation, unstable movement, and a high risk of scratching the inner wall of the product during the core-pulling process, leading to product tearing, deformation, or even breakage, resulting in a low yield rate and failing to meet the needs of mass production.
[0004] Therefore, there is a lack of a dedicated arc-shaped core-pulling mechanism suitable for arc-shaped products 10 in the field. Utility Model Content
[0005] The purpose of this invention is to provide a special arc-shaped core-pulling mechanism suitable for arc-shaped products.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: an arc-shaped core-pulling structure, comprising an upper fixed plate, a front template, a rear template, a support plate, a rear spring plate, and a lower fixed plate arranged sequentially from top to bottom; a front mold core is provided inside the front template; a rear mold core, a slider seat that can slide within the rear template, and a first guide block and a second guide block located on both sides of the slider seat are provided inside the rear template; an arc-shaped slider is connected to the slider seat, the arc-shaped slider having an arc-shaped rod portion that extends into the product cavity, the arc-shaped rod portion being used to form the arc-shaped inner cavity of the arc-shaped product; a hydraulic cylinder is connected to the support plate, the piston rod of the hydraulic cylinder moving along the X direction; the piston rod is connected to a transmission unit that converts the linear motion of the piston rod into the arc-shaped motion of the slider seat, the transmission unit being disposed inside the rear spring plate; the transmission unit includes a rack connected to the piston rod, a rotating shaft arranged perpendicular to the rack, a first gear fixed on the rotating shaft and meshing with the rack, and a second gear and a third gear fixed to the end of the rotating shaft and meshing with the corresponding slider seat.
[0007] Preferably, the slider seat includes an arc-shaped rack facing the transmission unit, a first arc-shaped protrusion that slides with the first guide block, and a second arc-shaped protrusion that slides with the second guide block; the first guide block and the second guide block are respectively provided with a first arc-shaped groove and a second arc-shaped groove that match the shape of the first arc-shaped protrusion and the second arc-shaped protrusion.
[0008] Preferably, the arc-shaped slider is connected to the top of the slider seat through the connecting part at the bottom. The connecting part has multiple teeth on its side. When the arc-shaped slider is installed on the slider seat, the teeth and the arc-shaped rack on the slider seat are spliced to form a continuous and complete arc-shaped rack structure. The arc-shaped rack structure is used to mesh with the second gear or the third gear of the transmission unit.
[0009] Preferably, the slider seat is also provided with a connecting block, and the bottom of the connecting part of the arc-shaped slider is provided with a connecting groove. The connecting block is inserted into the connecting groove and the slider seat and the arc-shaped slider are detachably connected by bolts.
[0010] Preferably, the transmission unit further includes a first bearing seat and a second bearing seat fixed to the rear spring plate, and the two ends of the rotating shaft are respectively supported in the first bearing seat and the second bearing seat by bearings.
[0011] Preferably, the hydraulic cylinder is mounted via a hydraulic cylinder fixing plate, which is connected to a first fixing seat and a second fixing seat fixed on the support plate.
[0012] Preferably, the front mold core, the rear mold core, and the arc-shaped sliders located on both sides in the Y direction together form two symmetrical product cavities, which are used to mold two arc-shaped products in one step.
[0013] Preferably, the first guide block and the second guide block are fixedly installed inside the rear template.
[0014] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This invention creatively employs a combination of gear and arc-shaped rack transmission with arc-shaped protrusions and arc-shaped groove guidance. The linear motion of the hydraulic cylinder is converted into the rotational motion of the shaft via a transmission unit. Then, the second and third gears mesh with the complete arc-shaped rack formed by the slider seat and the arc-shaped slider. Finally, guided by the arc-shaped protrusions and arc-shaped grooves, the arc-shaped slider smoothly slides along a predetermined arc trajectory. This solves the technical problem of the arc-shaped inner cavity of arc-shaped products not being able to be directly demolded, effectively avoiding scratches on the inner wall of the product during core pulling, achieving smooth arc-shaped core pulling, and allowing for the molding of two core-pulled products at once, significantly improving the product yield.
[0015] By setting up a transmission unit, a single rotating shaft and multiple gears simultaneously control the synchronous movement of the slider seats on both sides in the Y direction, achieving synchronous demolding of the product cavities on both sides. This compact layout greatly optimizes the internal space of the mold, making the mold structure more concentrated and rational. It is particularly suitable for achieving complex actions within limited mold dimensions, and can mold two core-pulling products at once, significantly improving production efficiency.
[0016] The transmission unit's shaft is stably supported on the rear spring plate by bearing seats and bearings at both ends, ensuring the smoothness of the transmission process. At the same time, the slider seat slides between two guide blocks through two arc-shaped protrusions, forming a positioning constraint that effectively restricts the degrees of freedom in other directions, preventing jamming, swaying, and wear during the movement.
[0017] The curved slider and the slider seat are connected by a connecting block and a connecting groove, and then bolts are used to complete the connection. This allows the curved slider, a vulnerable part or a component that needs to be changed, to be quickly and easily assembled, disassembled, and replaced, greatly reducing the maintenance cost and time of the mold and improving production flexibility. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the arc-shaped product structure involved in this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the arc-shaped product involved in this utility model; Figure 3 This is a three-dimensional structural diagram of an arc-shaped core-pulling structure proposed in this utility model; Figure 4 This is a three-dimensional structural diagram of the transmission unit involved in this utility model; Figure 5 for Figure 4 A cross-sectional schematic diagram of the slider seat on the XOZ surface; Figure 6 This is a schematic diagram showing the installation of the slider seat and the guide blocks on both sides; Figure 7 for Figure 6 A schematic diagram of the explosion of the middle structure in the Y direction; Figure 8 for Figure 7 A schematic diagram of the exploded view from another angle; Figure 9 This is a schematic diagram of the three-dimensional structure of the arc-shaped slider involved in this utility model; Figure 10 This is a three-dimensional structural diagram of the arc-shaped slider involved in this utility model from an upward viewing angle; Figure 11 This is a cross-sectional schematic diagram of the arc-shaped core-pulling structure of this utility model at the arc-shaped slider. Figure 12 for Figure 11 Enlarged view of point A in the middle; Explanation of reference numerals in the attached drawings: 10. Arc-shaped product; 101. Arc-shaped inner cavity; 1. Upper fixing plate; 2. Front template; 20. Front mold core; 3. Rear template; 30. Rear mold core; 31. Slider seat; 311. Arc-shaped rack; 312. First arc-shaped protrusion; 313. Second arc-shaped protrusion; 314. Connecting block; 315. First bolt hole; 32. First guide block; 321. First arc-shaped groove; 33. Second guide block; 331. Second arc-shaped groove; 34. Arc-shaped slider; 35. Connecting part; 351. Second bolt. 36. Bolt hole; 37. Tooth; 38. Connecting groove; 4. Arc-shaped rod; 5. Support plate; 6. Rear spring plate; 7. Lower fixing plate; 8. Hydraulic cylinder; 71. Piston rod; 711. Snap connector; 72. Hydraulic cylinder fixing plate; 73. First fixing seat; 74. Second fixing seat; 8. Transmission unit; 81. Rack; 811. Rack connector; 82. Rotating shaft; 83. First gear; 84. Second gear; 85. Third gear; 86. First bearing seat; 87. Second bearing seat; 88. Bearing; 9. Product cavity. Detailed Implementation
[0019] As described in the background section, for an arc-shaped product 10 to form its arc-shaped inner cavity 101, an arc-shaped rod needs to extend into the cavity to participate in product molding. However, there is no corresponding mechanism for removing the arc-shaped core rod. Currently, conventional core-pulling and demolding mechanisms in the industry, such as inclined guide pillar slider mechanisms or hydraulic cylinder direct-pulling mechanisms, have their motion trajectories strictly limited to straight lines. Attempts to directly apply these linear motion mechanisms to arc-shaped core pulling typically result in two types of failed attempts: One approach is to forcibly design an extremely complex motion conversion mechanism that decomposes and synthesizes linear motion into approximate arc-shaped motion. This method not only results in a bulky mold structure and high manufacturing costs, but also produces motion trajectories that are mostly approximate, with poor precision, making the product extremely prone to scratching or even breaking during the core-pulling process.
[0020] Secondly, an attempt was made to divide the overall arc-shaped core rod into multiple segments that could be pulled out in a straight line. However, this would leave unacceptable seams inside the product cavity, severely affecting the product's appearance quality and structural integrity. Therefore, how to achieve an arc-shaped core pulling mechanism that matches the product's arc-shaped inner cavity and has a controllable trajectory is the problem that this utility model needs to solve.
[0021] To address the problems in the background art, this utility model provides an arc-shaped core-pulling structure, where the mold opening and closing direction is the Z direction; the extension and retraction direction of the piston rod 71 of the hydraulic cylinder 7 is the X direction; and the horizontal direction perpendicular to both the X and Z directions is the Y direction. It includes, from top to bottom, an upper fixed plate 1, a front template 2, a rear template 3, a support plate 4, a rear spring plate 5, and a lower fixed plate 6. A front mold core 20 is disposed within the front template 2; a rear mold core 30, a slider seat 31 that can slide within the rear template 3, and a first guide block 32 and a second guide block 33 located on both sides of the slider seat 31 are disposed within the rear template 3. The first guide block 32 and the second guide block 33 are fixedly installed within the rear template 3 and provide arc-shaped constraints on the slider seat 31 in the XZ plane. The slider seat 31 is connected to an arc-shaped slider 34, which has an arc-shaped rod 38 extending into the product cavity 9. The arc-shaped rod 38 is used to form the arc-shaped inner cavity 101 of the arc-shaped product 10. The front mold core 20, the rear mold core 30, and the arc-shaped sliders 34 located on both sides in the Y direction together form two symmetrical product cavities 9. The two symmetrical product cavities 9 are used to form two arc-shaped products 10 at one time. The Z direction is the mold opening direction. A hydraulic cylinder 7 is connected to the support plate 4. The piston rod 71 of the hydraulic cylinder 7 moves in the X direction. The hydraulic cylinder 7 is mounted through a hydraulic cylinder fixing plate 72, which is connected to a first fixing seat 73 and a second fixing seat 74 fixed on the support plate 4. The piston rod 71 is connected to a transmission unit 8 that converts the linear motion of the piston rod 71 into the arc motion of the slider seat 31. The transmission unit 8 is located inside the rear spring plate 5. The arc-shaped slider 34 is connected to the top of the slider seat 31 through the bottom connecting part 35. The connecting part 35 has multiple teeth 36 on its side. When the arc-shaped slider 34 is installed on the slider seat 31, the teeth 36 and the arc-shaped rack 311 on the slider seat 31 are spliced to form a continuous and complete arc-shaped rack structure for meshing with the second gear 84 or the third gear 85 of the transmission unit 8.
[0022] The transmission unit 8 includes a rack 81 connected to the piston rod 71, a rotating shaft 82 perpendicular to the rack 81, a first gear 83 fixed to the rotating shaft 82 and meshing with the rack 81, and a second gear 84 and a third gear 85 fixed to the end of the rotating shaft 82 and meshing with the corresponding slider seat 31. The transmission unit 8 also includes a first bearing seat 86 and a second bearing seat 87 fixed to the rear spring plate 5. The two ends of the rotating shaft 82 are respectively supported in the first bearing seat 86 and the second bearing seat 87 by bearings 88. The hydraulic cylinder 7 drives the rack 81 to move linearly, which in turn drives the rotating shaft 82 to rotate through the first gear 83. The second gear 84 and the third gear 85 then drive the slider seats 31 on both sides to slide along an arc-shaped trajectory, thereby realizing the arc-shaped core pulling and resetting of the arc-shaped slider 34. The slider seat 31 includes an arc-shaped rack 311 facing the transmission unit 8, a first arc-shaped protrusion 312 that slides with the first guide block 32, and a second arc-shaped protrusion 313 that slides with the second guide block 33; the first guide block 32 and the second guide block 33 are respectively provided with a first arc-shaped groove 321 and a second arc-shaped groove 331 that match the shape of the first arc-shaped protrusion 312 and the second arc-shaped protrusion 313; the slider seat 31 is also provided with a connecting block 314, and the bottom of the connecting part 35 of the arc-shaped slider 34 is provided with a connecting groove 37, and the connecting block 314 is inserted into the connecting groove 37 to realize the fixed connection between the slider seat 31 and the arc-shaped slider 34.
[0023] like Figure 3 The diagram shows an upper fixed plate 1, a front template 2, a rear template 3, a support plate 4, a rear spring plate 5, and a lower fixed plate 6 connected in sequence. A hydraulic cylinder 7 is connected to a first fixed seat 73 and a second fixed seat 74 via a hydraulic cylinder fixing plate 72. The first fixed seat 73 and the second fixed seat 74 are fixed to the support plate 4. The piston rod 71 of the hydraulic cylinder 7 is connected to a transmission unit 8. A front mold core 20 is provided inside the front template 2. A rear mold core 30, a first guide block 32, and a second guide block 33 are provided inside the rear template 3. A slider seat 31 is slidably engaged with the first guide block 32 and the second guide block 33. The top of the 31 is connected to a fixed arc-shaped slider 34, and the connecting part 35 on the arc-shaped slider 34 is connected to the slider seat 31. The multiple teeth 36 on the arc-shaped slider 34 and the arc-shaped rack 311 on the slider seat 31 can be spliced to form a complete arc-shaped rack. The connecting groove 37 on the connecting part 35 can be used to lock the connecting block 314 on the slider seat 31. The arc-shaped rod part 38 on the arc-shaped slider 34 participates in the arc-shaped product 10 and forms an arc-shaped inner cavity 101. The front mold core 20 of the front template 2, the rear mold core 30 of the rear template 3, and the arc-shaped slider 34 together form the product cavity 9. This structure can form two arc-shaped products 10 at one time, with a product cavity 9 on each side of the transmission unit 8.
[0024] Figure 4The diagram shows a transmission unit 8. The transmission unit 8 has a first guide block 32, a second guide block 33, and a slider seat 31 on both sides in the Y direction. The transmission unit 8 includes a rack 81 that moves linearly in the X direction with the piston rod 71 of the hydraulic cylinder 7, and a rotating shaft 82 located in the Y direction and perpendicular to the rack 81, positioned above it. A snap-fit connector 711 connects the piston rod 71 to the end of the rack 81, engaging the rack connector 811 to connect the piston rod 71 to the rack 81. The rotating shaft 82 has a first gear 83 meshing with the rack 81, a second gear 84 meshing with one of the slider seats 31, and a third gear 85 meshing with the other slider seat 31. Both ends of the rotating shaft 82 are connected to the rear spring plate 5 via a first bearing seat 86 and a second bearing seat 87, respectively.
[0025] like Figure 5 As shown, both the first bearing housing 86 and the second bearing housing 87 are equipped with bearings 88 for connecting the ends of the rotating shaft 82; this allows the rotating shaft 82 to rotate with the first gear 83, thereby driving the second gear 84 and the third gear 85 to rotate synchronously, and consequently, the two corresponding slider seats 31 rotate synchronously in the opposite direction with the second gear 84 and the third gear 85. Figure 5 The diagram also shows that the arc-shaped rod 38 on the arc-shaped slider 34 extends into the interior of the arc-shaped product 10. The bottom of the arc-shaped slider 34 is fixedly connected to the top of the slider seat 31. The slider seat 31 can slide along the second arc-shaped groove 331 of the second guide block 33 under the drive of the transmission unit 8. At the same time, the slider seat 31 also slides along the first arc-shaped groove 321 of the first guide block 32 (this part is cut off and not shown).
[0026] Figure 6 This is a schematic diagram showing the installation of the slider seat 31 with the first guide block 32 and the second guide block 33 on both sides. Figure 7 for Figure 6 A schematic diagram of the explosion of the middle structure in the Y direction. Figure 8 for Figure 7 Another exploded view shows the slider seat 31, which includes an arc-shaped rack 311 facing the transmission unit, a first arc-shaped protrusion 312 that slides in conjunction with the first arc-shaped groove 321 of the first guide block 32, a second arc-shaped protrusion 313 that slides in conjunction with the second arc-shaped groove 331 of the second guide block 33, and a connecting block 314 that connects to the connecting groove 37 on the connecting part 35. The connecting block 314 has three first bolt holes 315 around its perimeter.
[0027] Figure 9 This is a schematic diagram of the three-dimensional structure of the arc-shaped slider 34. Figure 10This is a three-dimensional structural diagram of the arc-shaped slider 34 viewed from below. The arc-shaped slider 34 includes a connecting part 35 connected to the slider seat 31, and the connecting part 35 has multiple teeth 36. The bottom of the connecting part 35 has a connecting groove 37. The connecting groove 37 has three second bolt holes 351 around its perimeter. The bolt passes through the first bolt hole 315 and then extends into the corresponding second bolt hole 351 to complete the connection between the arc-shaped slider 34 and the slider seat 31. The arc-shaped slider 34 also includes an arc-shaped rod part 38 fixed to the connecting part 35 and extending into the product cavity 9.
[0028] Figure 11 This is a cross-sectional view of the arc-shaped core-pulling structure at the arc-shaped slider. Figure 12 for Figure 11 Enlarged schematic diagram at point A; the diagram shows that the front mold core 20, the rear mold core 30, and the arc-shaped slider 34 together form the product cavity 9. The arc-shaped rod 38 at the top of the arc-shaped slider 34 extends into the product cavity 9. The bottom of the arc-shaped slider 34 is connected to the slider seat 31 via the connecting part 35. The arc-shaped rack on the side of the slider seat 31 near the second gear 84 can mesh with the second gear 84. Under the drive of the transmission unit 8, the slider seat 31, the arc-shaped slider 34, and the arc-shaped rod 38 all move in an arc shape.
[0029] When injection molding is complete and mold opening is required, the piston rod 71 of the hydraulic cylinder 7 retracts inward, driving the rack 81 connected to it to move linearly in the positive X direction. The rack 81 drives the first gear 83 meshing with it to rotate counterclockwise, thereby driving the rotating shaft 82 to rotate within the first bearing seat 86 and the second bearing seat 87. The second gear 84 and the third gear 85 fixed at both ends of the rotating shaft 82 rotate synchronously. The second gear 84 and the third gear 85 mesh with the arc-shaped rack 311 on the slider seats 31 on both sides, thereby transmitting the counterclockwise rotational motion to the slider seats 31 for clockwise rotation. Driven by the second gear 84 and the third gear 85, the first arc-shaped protrusion 312 and the second arc-shaped protrusion 313 on the slider seat 31 slide along the first arc-shaped groove 321 of the first guide block 32 and the second arc-shaped groove 331 of the second guide block 33, respectively. The slider seat 31 is forced to move the arc-shaped slider 34 at its top along the predetermined arc trajectory in accordance with the pointer, so that the arc-shaped rod 38 of the arc-shaped slider 34 is smoothly pulled out from the arc-shaped inner cavity 101 of the arc-shaped product 10, thus completing the arc-shaped core pulling action.
[0030] When injection molding is required, the mold is closed. The piston rod 71 of the hydraulic cylinder 7 extends outward and drives the rack 81 to move linearly in the negative X direction through the transmission unit 8. This causes the first gear 83, the rotating shaft 82, the second gear 84, and the third gear 85 to rotate clockwise. This, in turn, drives the slider seats 31 on both sides and the arc-shaped slider 34 to move counterclockwise along the original arc trajectory until the arc-shaped rod part 38 of the arc-shaped slider 34 returns to the molding position in the product cavity 9, preparing for the next injection molding cycle.
[0031] In summary, this utility model provides an arc-shaped core-pulling structure. By setting up a transmission unit 8 driven by a hydraulic cylinder 7, utilizing the meshing transmission of gears and arc-shaped racks 311, and the sliding engagement of the slider seat 31 and the arc-shaped groove on the guide block, the linear motion of the hydraulic cylinder 7 is successfully converted into the arc-shaped motion of the arc-shaped slider 34. This effectively solves the problem of core-pulling and demolding of the inner cavity of arc-shaped products, avoids product tearing and deformation, and ensures molding quality. Furthermore, by increasing the number of gears corresponding to the slider seat in the transmission unit 8, two or more products can be produced (typically 2, 4, or 8 depending on requirements), improving production efficiency. The entire mechanism has a reasonable layout, stable and reliable movement, and meets the injection molding requirements of arc-shaped products.
Claims
1. An arc-shaped core-pulling structure, comprising, from top to bottom, an upper fixing plate (1), a front template (2), a rear template (3), a support plate (4), a rear spring plate (5), and a lower fixing plate (6); characterized in that: The front mold plate (2) is provided with a front mold core (20); the rear mold plate (3) is provided with a rear mold core (30), a slider seat (31) that can slide in the rear mold plate (3), a first guide block (32) and a second guide block (33) located on both sides of the slider seat (31); the slider seat (31) is connected to an arc-shaped slider (34), the arc-shaped slider (34) has an arc-shaped rod part (38) that extends into the product cavity (9), the arc-shaped rod part (38) is used to form the arc-shaped inner cavity (101) of the arc-shaped product (10); the support plate (4) is connected to a hydraulic cylinder (7), the piston rod (71) of the hydraulic cylinder (7) is connected to the support plate (4). The piston rod (71) moves along the X direction; the piston rod (71) is connected to a transmission unit (8) that converts the linear motion of the piston rod (71) into the arc motion of the slider seat (31). The transmission unit (8) is located in the rear spring plate (5). The transmission unit (8) includes a rack (81) connected to the piston rod (71), a rotating shaft (82) perpendicular to the rack (81), a first gear (83) fixed on the rotating shaft (82) and meshing with the rack (81), and a second gear (84) and a third gear (85) fixed to the end of the rotating shaft (82) and meshing with the corresponding slider seat (31).
2. The arc-shaped core-pulling structure according to claim 1, characterized in that: The slider seat (31) includes an arc-shaped rack (311) facing the transmission unit (8), a first arc-shaped protrusion (312) that slides with the first guide block (32), and a second arc-shaped protrusion (313) that slides with the second guide block (33); the first guide block (32) and the second guide block (33) are respectively provided with a first arc-shaped groove (321) and a second arc-shaped groove (331) that match the shape of the first arc-shaped protrusion (312) and the second arc-shaped protrusion (313).
3. The arc-shaped core-pulling structure according to claim 2, characterized in that: The arc-shaped slider (34) is connected to the top of the slider seat (31) through the connecting part (35) at the bottom. The connecting part (35) has multiple teeth (36) on its side. When the arc-shaped slider (34) is installed on the slider seat (31), the teeth (36) and the arc-shaped rack (311) on the slider seat (31) are spliced to form a continuous and complete arc-shaped rack structure. The arc-shaped rack structure is used to mesh with the second gear (84) or the third gear (85) of the transmission unit (8).
4. The arc-shaped core-pulling structure according to claim 2, characterized in that: A connecting block (314) is also provided on the slider seat (31). A connecting groove (37) is provided at the bottom of the connecting part (35) of the arc slider (34). The connecting block (314) is inserted into the connecting groove (37) and the slider seat (31) and the arc slider (34) are detachably connected by bolts.
5. The arc-shaped core-pulling structure according to claim 1, characterized in that: The transmission unit (8) also includes a first bearing seat (86) and a second bearing seat (87) fixed on the rear spring plate (5). The two ends of the rotating shaft (82) are supported in the first bearing seat (86) and the second bearing seat (87) respectively by bearings (88).
6. The arc-shaped core-pulling structure according to claim 1, characterized in that: The cylinder (7) is installed via the cylinder fixing plate (72), which is connected to the first fixing seat (73) and the second fixing seat (74) fixed on the support plate (4).
7. The arc-shaped core-pulling structure according to claim 1, characterized in that: The front mold core (20), the rear mold core (30), and the arc-shaped sliders (34) located on both sides of the Y direction together form two symmetrical product cavities (9), which are used to form two arc-shaped products (10) in one step.
8. The arc-shaped core-pulling structure according to claim 1, characterized in that: The first guide block (32) and the second guide block (33) are fixedly installed inside the rear template (3).