A core-pulling structure and device for die-casting molds driven by a hydraulic cylinder and helical gears.

Abstract

This application relates to a core-pulling structure and device for die-casting molds using a hydraulic cylinder-driven helical gear, belonging to the field of mold technology. It includes a core-pulling block, a mounting block, a drive rod, and a drive cylinder. The mounting block is installed on a fixed mold frame and forms a sliding cavity for the core-pulling block to slide. One end of the core-pulling block protrudes and has a core-pulling post. The end of the core-pulling block with the core-pulling post fills a portion of the fixed mold core and forms a cavity. The core-pulling post penetrates the fixed mold core and enters the cavity. The drive cylinder is installed on the side wall of the fixed mold frame and drives the drive rod to move. The drive rod passes through the sliding cavity of the mounting block, and the drive rod and the core-pulling block form a mutually cooperating pushing groove and pushing protrusion. The pushing protrusion extends at a certain angle relative to the moving direction of the drive rod. The pushing protrusion slides with the drive rod and changes height within the sliding cavity, causing the core-pulling block to move up and down within the sliding cavity. This application has the effect of achieving oblique upward core pulling through lateral installation, thus avoiding interference with die-casting machine components.

Description

Technical Field

[0001] This application relates to the field of molds, and in particular to a core-pulling structure and device for a die-casting mold with a hydraulic cylinder driving a helical gear. Background Technology

[0002] Die casting is a metal casting process characterized by applying high pressure to molten metal within a mold cavity. The mold is typically made of a high-strength alloy, and the process is somewhat similar to injection molding. The die casting mold is a type of mold used to implement the die casting process. The basic process is as follows: molten metal is first poured into the mold cavity at low or high speed. The mold has movable cavity surfaces that are pressurized and forged as the molten metal cools, eliminating shrinkage cavities and porosity defects in the blank and achieving a forged, fragmented grain structure in the blank.

[0003] Since die casting involves a demolding process after the die casting part is formed, and the upper structure of the die casting part can hinder demolding, a core-pulling structure needs to be set on the die casting mold. This ensures that the cavity is intact and can complete the forming of the die casting part, while the core-pulling block of the core-pulling structure does not affect the demolding of the die casting part after it is removed. For a type of die casting part that has openings on both the top and bottom and the two openings are not completely perpendicular to each other, one opening needs to face the moving mold and the other opening needs to face the fixed mold during die casting for demolding. Since the moving mold generally needs to be completely separated from the die casting part when it moves, a core-pulling structure needs to be set on the fixed mold for core pulling. Common core-pulling structures include a core-pulling block and a core-pulling drive component that moves the core-pulling block.

[0004] Due to the presence of the die-casting machine, if the core-pulling assembly on the fixed mold is installed on the side of the fixed mold away from the moving mold, it is easy to interfere with the equipment on the die-casting part. Therefore, in the design, the core-pulling assembly is generally placed on the side of the fixed mold. However, if the included angle between the two openings of the die-casting part is small, it can be achieved by rotating the state of the die-casting part during molding by a certain angle and then setting the corresponding core-pulling assembly on the moving mold. However, if the included angle between the two openings of the die-casting part is large, it is still difficult to achieve. Moreover, the presence of multiple core-pulling assemblies still has a significant impact on molding quality and demolding. Therefore, the most important direction in the design and innovation of die-casting molds is to use the fewest core-pulling assemblies while achieving smooth die-casting and demolding, and to place the core-pulling assemblies on the side of the mold and occupy as little space as possible. Summary of the Invention

[0005] In one aspect, in order for the core-pulling assembly to achieve an upward core-pulling process on the side of the fixed mold, this application provides a core-pulling structure for a die-casting mold with a hydraulic cylinder driving a helical gear.

[0006] The technical solution provided in this application for a core-pulling structure and device for a die-casting mold driven by a hydraulic cylinder and a helical gear is as follows:

[0007] A core-pulling structure for a die-casting mold with a hydraulic cylinder driving a helical gear includes a core-pulling block, a mounting block, a drive rod, and a drive hydraulic cylinder. The mounting block is installed on a fixed mold frame and forms a sliding cavity for sliding the core-pulling block. One end of the core-pulling block has a protruding core-pulling post. The end of the core-pulling block with the core-pulling post fills a portion of the fixed mold core and forms a cavity. The core-pulling post penetrates the fixed mold core and enters the cavity. The drive hydraulic cylinder is installed on the side wall of the fixed mold frame and drives the drive rod to move. The drive rod passes through the sliding cavity of the mounting block, and the drive rod and the core-pulling block form a mutually cooperating push groove and push protrusion. The extension direction of the push protrusion is inclined at a certain angle relative to the moving direction of the drive rod. The push protrusion slides with the drive rod and changes height within the sliding cavity, thereby driving the core-pulling block to move up and down within the sliding cavity.

[0008] By adopting the above technical solution, the driving cylinder drives the driving rod to move relative to the mounting block, while the part of the driving rod in the sliding cavity performs a reciprocating interlacing motion. During this movement of the driving rod, through the mutually cooperating pushing groove and pushing protrusion formed with the core-pulling block, the core-pulling block can move vertically within the sliding cavity, ultimately realizing the core-pulling and resetting motion of the core-pulling block. Due to the relative position of the driving rod and the mounting block, the driving cylinder can be installed on the side of the fixed mold frame, ultimately realizing the upward core-pulling process of the core-pulling block on the side of the fixed mold frame. At the same time, since the driving rod and the core-pulling block are not directly connected, during die casting, the pressure in the cavity is not easily transmitted to the driving cylinder through the core-pulling block, reducing the support pressure of the driving cylinder, and the core-pulling block is not easily retracted during die casting.

[0009] Optionally, the drive rod is located next to the core-pulling block, the push oblique protrusion is disposed on the side wall of the core-pulling block facing the drive rod, the lower point of the push oblique protrusion is disposed close to the drive cylinder, and the angle between the push oblique protrusion and the moving direction of the drive rod is less than 45 degrees.

[0010] By adopting the above technical solution, the drive rod and the core-pulling block are in contact with each other to achieve the cooperation of the pushing convex and the pushing groove. Compared with the method of the drive rod passing through the core-pulling block, this setting allows the core-pulling block to be shorter, and the process of the drive rod driving the core-pulling block is smoother. The angle between the pushing convex and the direction of movement of the drive rod is less than 45 degrees, which makes the direction of the force applied by the pushing convex to the pushing groove more vertical, which is conducive to the sliding of the core-pulling block and the core-pulling block is less likely to get stuck. The lower point of the pushing convex is close to the drive cylinder, which enables the core to be removed when the drive cylinder pulls the drive rod to retract. Compared with pushing the core to remove the core, the force is more stable and it is also conducive to cooperating with the anti-reverse structure.

[0011] Secondly, in order to better facilitate die casting and core pulling with the aforementioned core-pulling assembly, this application provides a die casting mold core-pulling device driven by a hydraulic cylinder and a helical gear, employing the following technical solution:

[0012] A core-pulling device for a die-casting mold driven by a hydraulic cylinder and a helical gear includes a backstop structure and the aforementioned core-pulling structure. The backstop structure includes a backstop surface and a limiting surface. The mounting block has a drive sliding hole through which the drive rod passes. The drive sliding hole communicates with the sliding cavity. The drive rod is a cylindrical rod. The backstop surface is formed on the drive rod, and the push groove is formed on the side of the drive rod away from the backstop surface. The limiting surface is part of the wall of the drive sliding hole and fits against the backstop surface. The backstop surface is parallel to the moving direction of the drive rod. The portion of the drive sliding hole away from the limiting surface is spaced apart from the drive rod.

[0013] By adopting the above technical solution, the anti-reverse structure prevents the core-pulling block from retracting during die casting, ensuring the stability of the die casting process. The anti-reverse surface and the limiting surface of the anti-reverse structure abut against each other, and the planar structure strongly maintains the state of the drive rod, limiting the circumferential rotation of the drive rod. At the same time, in conjunction with the drive cylinder, the axial movement of the drive rod is limited, thus achieving anti-reverse. The anti-reverse surface is located on the back of the pushing convex. Since the downward movement of the core-pulling block is away from the anti-reverse surface, and the upward movement of the core-pulling block is closer to the anti-reverse surface, the friction between the anti-reverse surface and the limiting surface is small when the core-pulling block is driven by the drive rod, making it easier for the drive rod to drive the core-pulling block. Conversely, during the process of the core-pulling block driving the drive rod, the friction between the anti-reverse surface and the limiting surface increases due to pressure, ultimately achieving the anti-reverse function. The fact that the pushing convex does not contact the drive sliding hole ensures that the process of the drive rod driving the core-pulling block is smooth, reducing the obstruction to the movement of the drive rod under the drive cylinder.

[0014] Optionally, there are multiple pushing oblique protrusions, which are equally spaced apart, and there are multiple pushing oblique grooves, which correspond one-to-one with the multiple pushing oblique protrusions.

[0015] By adopting the above technical solution, multiple push convex and push grooves are set, making the process of the drive rod driving the core-pulling block to slide more smoothly. On the other hand, the formed rack-type push convex can better limit the backward movement of the core-pulling block. Multiple push convex also serve as part of the anti-backward structure to enhance the anti-backward function.

[0016] Optionally, the drive cylinder is provided with a guide limiting assembly, which includes a guide rod, a guide block, and a limiting block. The guide block is installed on the cylinder body of the drive cylinder and cooperates with the guide rod. The limiting block is installed on the piston rod of the drive cylinder and cooperates with the guide rod. There is only one sliding engagement between the guide block and the guide rod, and between the limiting block and the guide rod.

[0017] By adopting the above technical solution, the setting of the guide limiting component can further restrict the sliding direction of the piston rod of the drive cylinder. At the same time, it restricts the deformation of the piston rod of the drive cylinder, so that the reverse force of the core pulling block on the piston rod of the drive cylinder through the drive rod will not affect the state of the drive cylinder, and the core pulling process is always stable.

[0018] Optionally, the guide limiting component further includes a stroke detection block, which is installed on the guide rod and moves synchronously with the limiting block. A position sensor is provided on the cylinder body of the drive cylinder to detect the position of the stroke detection block.

[0019] By adopting the above technical solution, the position of the piston rod of the drive cylinder is detected through the cooperation of the stroke detection block and the position sensor, thereby better controlling the operation of the drive cylinder and limiting the stroke range of the drive rod.

[0020] Optionally, the mounting block includes an upper block and a lower block, which are assembled and fixed together, and the driving sliding hole is formed between the upper block and the lower block. The limiting surface is provided on the upper block. The lower block has a contact arc surface on the part of the hole wall near the upper block. The contact arc surface fits the surface of the drive rod where the pushing groove is not formed. The lower block has an arc-shaped notch on the surface forming the driving sliding hole, and the arc-shaped notch is located next to the contact arc surface.

[0021] By adopting the above technical solution, the mounting block is set into two parts: an upper block and a lower block. The drive sliding hole is located between the upper block and the lower block, which facilitates the assembly of the core-pulling block and the drive rod. The limiting surface is set on the upper block, and in conjunction with the setting of the contact arc surface, the drive rod is positioned and assembled between the upper block and the lower block, which better restricts the drive rod. The opening of the arc-shaped notch next to the contact arc surface further ensures that the pushing oblique protrusion will not be obstructed.

[0022] Optionally, the lower block includes a lower left block and a lower right block, the driving sliding hole is opened in the lower left block, the lower block has a guide notch located between the lower left block and the lower right block, and the core-pulling block is provided with a stop block that slides together, the stop block being located within the guide notch.

[0023] By adopting the above technical solution, the sliding of the core-pulling block is further guided. The sliding of the core-pulling block is restricted by the cooperation of the anti-reverse block and the guide notch. At the same time, since the lower block is formed by assembling the lower left block and the lower right block, the setting of the anti-reverse block can better realize the positioning and installation of the core-pulling block on the lower block, which facilitates the assembly of the mounting block and the core-pulling block.

[0024] Optionally, the anti-reverse structure includes the anti-reverse block, the core-pulling block having a core-pulling mounting hole for mounting the core-pulling post, the core-pulling block having an anti-reverse hole communicating with the core-pulling mounting hole on the side facing the anti-reverse block, the core-pulling post having an anti-reverse insertion hole, the anti-reverse block having a protruding anti-reverse protrusion, the anti-reverse protrusion passing through the anti-reverse hole and the anti-reverse insertion hole in sequence and penetrating the core-pulling block, the mounting block having a final anti-reverse hole for inserting the anti-reverse protrusion, and an anti-reverse driving member being provided outside the mounting block to push the anti-reverse block to move and drive the anti-reverse protrusion in and out of the final anti-reverse hole.

[0025] By adopting the above technical solution, the anti-reverse block is associated with the core-pulling block through the anti-reverse protrusion, making the anti-reverse block an independent component. After the core-pulling block reaches the designated position, the anti-reverse drive component can drive the anti-reverse block to move into the anti-reverse protrusion and insert it into the final anti-reverse hole, thereby further stabilizing the core-pulling block on the corresponding position on the mounting block and further realizing the anti-reverse function. The anti-reverse effect is better. The core-pulling column and the core-pulling block are independent of each other, which facilitates maintenance. The anti-reverse block also ensures the association between the core-pulling column and the core-pulling block. The anti-reverse block realizes multiple functions.

[0026] Optionally, a limiting block is provided on the piston rod of the driving cylinder. When the limiting block moves to the final position with the piston rod of the driving cylinder, it drives the anti-retraction protrusion to insert into the final anti-retraction hole. A driving block is provided on the piston rod of the driving cylinder. The diameter of the driving block is larger than the diameter of the piston rod of the driving cylinder. A driving groove is opened at one end of the driving rod near the driving cylinder for the driving block to be engaged. The driving groove has a certain space for the driving block to slide. A strong spring is installed on the groove wall facing the end of the driving groove. The strong spring pushes the driving block to abut against the other groove wall of the driving groove. When the driving rod drives the core-pulling block to move down to the final position, the driving block continues to move and compresses the strong spring. At the same time, the limiting block, as the strong spring is compressed, drives the anti-retraction protrusion to begin to insert into the final anti-retraction hole. The limiting block, the driving block, and the strong spring cooperate to form the anti-retraction driving component.

[0027] By adopting the above technical solution, the limiting block is associated with the anti-reverse drive component, so that the anti-reverse protrusion on the anti-reverse block can disengage from the final anti-reverse hole when not driven by the anti-reverse drive component, ensuring smooth sliding. The power source of the anti-reverse drive component is also from the drive cylinder, so the dual functions of core pulling and anti-reverse can be realized through the drive cylinder, eliminating the need for a separate anti-reverse drive component, thereby further reducing the external installation space requirement of the fixed mold frame. Fewer components can be installed on the external part of the fixed mold frame, achieving further optimization of the die casting mold.

[0028] In summary, the drive cylinder moves the drive rod relative to the mounting block, while the part of the drive rod within the sliding cavity performs a reciprocating interlocking motion. This movement of the drive rod, through the mutually cooperating pushing groove and pushing protrusion formed with the core-pulling block, allows the core-pulling block to move vertically within the sliding cavity, ultimately achieving the core-pulling and resetting motion of the core-pulling block. Due to the relative position of the drive rod and the mounting block, the drive cylinder can be installed on the side of the fixed mold frame, ultimately enabling the upward core-pulling process of the core-pulling block to be performed from the side of the fixed mold frame. Simultaneously, since the drive rod and the core-pulling block are not directly connected, the pressure within the cavity is not easily transmitted to the drive cylinder through the core-pulling block during die casting, reducing the support pressure on the drive cylinder. The core-pulling block is also less likely to retract during die casting; the anti-retraction structure ensures the stability of the die casting process by preventing the core-pulling block from retracting. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the die-cast part in the embodiments of this application;

[0030] Figure 2 This is a schematic diagram of the core-pulling structure in one embodiment of this application.

[0031] Figure 3 This is a schematic diagram of the core-pulling device and the fixed mold according to an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the core-pulling device in the embodiments of this application;

[0033] Figure 5 This is a schematic diagram of the core-pulling structure according to another embodiment of this application. Figure 1 ;

[0034] Figure 6 This is a schematic diagram of the core-pulling structure according to another embodiment of this application. Figure 2 ;

[0035] Figure 7 This is a side view of the mounting block according to another embodiment of this application. Figure 1 ;

[0036] Figure 8 This is a schematic diagram of the installation structure of the guide restriction component in the embodiments of this application;

[0037] Figure 9 This is a side view of the mounting block according to another embodiment of the present application. Figure 2 ;

[0038] Figure 10 This is a schematic diagram of the installation structure of the anti-reverse block in the embodiments of this application;

[0039] Figure 11 This is a schematic diagram of the installation structure of the drive cylinder and drive rod in the embodiments of this application;

[0040] Figure 12 This is a cross-sectional view of the installation structure of the anti-reverse block in the embodiments of this application.

[0041] Explanation of reference numerals in the attached drawings: 1. Middle main body; 11. Extension angle; 12. Core-pulling protrusion; 13. Core-pulling hole; 2. Core-pulling structure; 21. Drive cylinder; 211. Drive block; 22. Drive rod; 221. Stroke block; 222. Drive slot; 223. Pushing groove; 23. Mounting block; 231. Sliding cavity; 232. Upper block; 2321. Upper limiting arc; 233. Lower block; 234. Drive sliding hole; 235. Arc-shaped notch; 236. Lower left block; 2361. Lower limiting arc; 2362. Limiting groove; 237. Lower right block; 238. Guide notch; 239. Final retraction hole; 24 1. Core-pulling block; 241. Core-pulling post; 242. Pushing convex protrusion; 243. Core-pulling mounting hole; 244. Anti-reverse hole; 245. Anti-reverse insertion hole; 246. Spring hole; 25. Guide limiting assembly; 251. Guide rod; 252. Guide block; 253. Limiting block; 254. Guide insertion post; 26. Stroke detection block; 27. Position sensor; 3. Anti-reverse structure; 31. Anti-reverse drive component; 32. Anti-reverse rod; 33. Anti-reverse surface; 34. Limiting surface; 35. Anti-reverse block; 351. Anti-reverse protrusion; 352. Stroke protrusion; 353. Reset post; 4. Fixed mold base; 5. Fixed mold core; 6. Strong spring; 7. Contact arc surface. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-12 This application will be described in further detail.

[0043] This application discloses a die-casting mold core-pulling device that uses a hydraulic cylinder to drive a helical gear.

[0044] With attachment Figure 1Taking the die casting part shown as an example, this die casting part includes a central body 1 and four extension corners 11 set on the four sides of the central body 1. The four extension corners extend outward in one direction. The die casting part has a large number of structural grooves in the extension direction of the extension corners. The extension direction of the four extension corners is set to face downward and to face the moving mold direction during die casting. The central body 1 has a core pulling protrusion 12 that protrudes obliquely upward in the middle. The core pulling protrusion 12 has a core pulling hole 13.

[0045] Reference Figure 2 A core-pulling device for a die-casting mold using a hydraulic cylinder-driven helical gear includes a core-pulling structure 2 and a backstop structure 3. In one embodiment, the core-pulling structure 2 and the backstop structure 3 are independent of each other. The core-pulling structure 2 includes a driving cylinder 21, a driving rod 22, a mounting block 23, and a core-pulling block 24. The driving cylinder 21 is mounted on a fixed mold frame 4. The mounting block 23 has through slots for the core-pulling block 24 to be installed at an angle. The piston rod of the driving cylinder 21 drives the driving rod 22 to reciprocate. The driving rod 22 slides back and forth through the core-pulling block 24. The core-pulling block 24 has openings opposite to its tilting and sliding direction. The inclined hole and the end of the drive rod 22 also extend in the opposite direction to the sliding direction of the core-pulling block 24 and pass through the core-pulling block 24, so that the drive rod 22 is retracted and drives the core-pulling block 24 to be pulled out obliquely upward. The anti-retraction structure 3 includes an anti-retraction drive 31 and an anti-retraction rod 32. The anti-retraction drive 31 is also a hydraulic cylinder and is installed on the fixed mold frame 4. The anti-retraction drive 31 drives the anti-retraction rod 32 to slide through the core-pulling block 24 or disengage from the core-pulling block 24. This embodiment is mainly used when there is enough space on the side of the fixed mold to install the anti-retraction drive 31. The fixed mold frame 4 occupies a lot of space on the side, and more devices are installed on the fixed mold frame 4.

[0046] Reference Figure 3 and Figure 4 In another embodiment, in order to achieve the anti-reverse function while reducing the need for lateral installation space of the fixed mold and reducing the external space occupied by the overall core-pulling device, the anti-reverse structure 3 and the core-pulling structure 2 are combined into one unit, which has obvious advantages.

[0047] Specifically, the core-pulling structure 2 includes a core-pulling block 24, a mounting block 23, a drive rod 22, a drive cylinder 21, and a guide and limiting assembly 25. The drive cylinder 21 is mounted on the fixed mold frame 4 of the fixed mold. The piston rod of the drive cylinder 21 enters the interior of the fixed mold frame 4 and is suspended towards the mounting block 23. The mounting block 23 is installed inside the fixed mold frame 4 and contacts the fixed mold core 5, located next to the fixed mold core 5. The interior of the mounting block 23 forms a space for the core-pulling block 24 to slide. The sliding cavity 231 is installed and obliquely penetrates the mounting block 23. The lower opening of the sliding cavity 231 penetrates the fixed mold core 5. The core-pulling block 24 is partially located in the sliding cavity 231 and partially penetrates the fixed mold core 5 as part of the forming cavity. The core-pulling block 24 is used to form the aforementioned core-pulling protrusion 12. The part of the core-pulling block 24 located in the fixed mold core 5 is provided with a core-pulling post 241, which forms the aforementioned core-pulling hole 13.

[0048] Reference Figure 5 and Figure 6 The mounting block 23 includes an upper block 232 and a lower block 233. The lower block 233 is in direct contact with the fixed mold core 5. The upper block 232 is located on the side of the lower block 233 away from the fixed mold core 5. The upper block 232 and the lower block 233 are assembled and fixed with screws. A drive sliding hole 234 is formed between the upper block 232 and the lower block 233. The drive sliding hole 234 penetrates the mounting block 23, and the direction of the drive sliding hole 234 penetrating the mounting block 23 is perpendicular to the extension direction of the sliding cavity 231. The drive rod 22 is cylindrical. The drive rod 22 is slidably installed in the drive sliding hole 234. The drive cylinder 21 drives the drive rod 22 to move in the drive sliding hole 234 through the piston rod. The end of the drive rod 22 closer to the drive cylinder 21 has a larger diameter than the maximum diameter of the drive sliding hole 234. At the same time, the end of the drive rod 22 away from the drive cylinder 21 is equipped with a stroke block 221 that cannot pass through the drive sliding hole 234, thereby limiting the drive rod 22 from disengaging from the mounting block 23 and controlling the sliding stroke limit of the drive rod 22.

[0049] Meanwhile, a T-shaped drive slot 222 is provided at one end of the drive rod 22 near the drive cylinder 21, and a drive block 211 larger than the diameter of the piston rod is provided at the end of the piston rod of the drive cylinder 21. The drive block 211 is fitted into the drive slot 222 to realize the connection between the drive cylinder 21 and the drive rod 22.

[0050] The drive rod 22 and the core-pulling block 24 form mutually cooperating push grooves 223 and push protrusions 242. The extension direction of the push protrusions 242 is inclined at a certain angle relative to the moving direction of the drive rod 22. The push protrusions 242 slide with the drive rod 22 and change height in the sliding cavity 231, thereby driving the core-pulling block 24 to move up and down in the sliding cavity 231. Specifically, the drive rod 22 is located next to the core-pulling block 24. The push protrusions 242 are set on the side wall of the core-pulling block 24 facing the drive rod 22. There are multiple push protrusions 242, which are equally spaced on the core-pulling block 24. There are multiple push grooves 223, which correspond one-to-one with the multiple push protrusions 242 and are opened on the drive rod 22. At the same time, the lower point of the push protrusions 242 is set close to the drive cylinder 21, and the angle between the push protrusions 242 and the moving direction of the drive rod 22 is less than 45 degrees. In this embodiment, a 30-degree angle is specifically used.

[0051] Reference Figure 6 and Figure 7 The aforementioned pushing oblique protrusion 242 protrudes in a direction perpendicular to the extension direction of the sliding cavity 231. At the same time, the driving rod 22 has a stop surface 33 on the side away from the pushing oblique groove 223. The stop surface 33 is parallel to the sliding direction of the core-pulling block 24. The upper block 232 has a limiting surface 34 on the part forming the driving sliding hole 234. The limiting surface 34 fits against the stop surface 33. The cooperation between the limiting surface 34 and the stop surface 33, as well as the cooperation structure of multiple sets of pushing oblique grooves 223 and pushing oblique protrusion 242, constitute the stop structure 3.

[0052] Among them, the lower block 233 has a contact arc surface 7 on the surface of the hole wall of the drive sliding hole 234 near the upper block 232. The contact arc surface 7 is in contact with the surface of the drive rod 22 where the push oblique protrusion 242 is not opened. The lower block 233 has an arc-shaped notch 235 on the surface of the drive sliding hole 234. The arc-shaped notch 235 is located next to the contact arc surface 7. At the same time, the part of the lower block 233 that forms the drive sliding hole 234 facing the limiting surface 34 is spaced apart from the drive rod 22. The upper block 232, except that the limiting surface 34 is in contact with the anti-retraction surface 33 of the drive rod 22, has the upper part of the limiting surface 34 extending beyond the drive rod 22 and forming a tangent to the lower block 233.

[0053] The lower block 233 includes a lower left block 236 and a lower right block 237. The driving sliding hole 234 is opened in the lower left block 236. The lower block 233 has a guide notch 238, which is located between the lower left block 236 and the lower right block 237. The extension direction of the guide notch 238 is consistent with the extension direction of the sliding cavity 231. The guide notch 238 exposes the sliding cavity 231.

[0054] Reference Figure 8The guide limiting assembly 25 is mounted on the drive cylinder 21. The guide limiting assembly 25 includes a guide rod 251, a guide block 252, and a limiting block 253. The guide block 252 is mounted on the cylinder body of the drive cylinder 21 and cooperates with the guide rod 251. The limiting block 253 is mounted on the piston rod of the drive cylinder 21 and cooperates with the guide rod 251. There is only one sliding fit between the guide block 252 and the guide rod 251, and between the limiting block 253 and the guide rod 251. In this embodiment, there are two guide blocks 252, which are respectively positioned along the driving direction of the drive cylinder 21. At both ends of the bottom wall of the hydraulic cylinder 21, the guide block 252 near the piston rod allows the guide rod 251 to slide through, and the guide block 252 away from the piston rod has a protruding guide post 254. The guide rod 251 has an opening for the guide post 254 to be inserted, so that the guide rod 251 is restricted by the guide post 254. One end of the guide rod 251 slides between the two guide blocks 252, and the other end of the guide rod 251 extends in the same direction as the piston rod. One end of the limiting block 253 is fixed to the piston rod, and the other end is fixed to the guide rod 251, so that the piston rod can move together with the guide rod 251 through the limiting block 253.

[0055] The guide limiting component 25 also includes a stroke detection block 26 and a position sensor 27. In this embodiment, the position sensor 27 can be a contact switch. The position sensor 27 is installed below the cylinder body of the drive cylinder 21 and is located next to the two guide blocks 252. The stroke detection block 26 is installed on the end of the guide rod 251 located between the two guide blocks 252 and moves synchronously with the guide rod 251. The two position sensors 27 respectively detect the beginning and end of the stroke of the piston rod driving the drive rod 22.

[0056] Reference Figure 9-12In a further embodiment, to improve the anti-reverse effect, the anti-reverse structure 3 also includes an anti-reverse block 35 and an anti-reverse drive 31. The anti-reverse block 35, driven by the anti-reverse drive 31, partially passes through the core-pulling block 24 and is engaged in the mounting block 23, reinforcing the anti-reverse action. Specifically, the anti-reverse drive 31 can be set separately or driven in combination with the aforementioned guide and restriction component 25. In this embodiment, the anti-reverse drive 31 is preferably set in combination. Specifically, the anti-reverse block 35 is located within the guide notch 238. The core-pulling block 24 and the core-pulling post 241 are independent. The core-pulling block 24 has a core-pulling mounting hole 243 for mounting the core-pulling post 241. One end of the core-pulling post 241 protrudes from the core-pulling block 24. The side of the core-pulling block 24 facing the anti-reverse block 35 has an anti-reverse hole 244 communicating with the core-pulling mounting hole 243. The core-pulling post 241 has an anti-reverse hole 244. The anti-retraction hole 245 and the anti-retraction block 35 are provided with an anti-retraction protrusion 351. The anti-retraction protrusion 351 passes through the anti-retraction hole 244 and the anti-retraction insertion hole 245 in sequence and passes through the core-pulling block 24. The mounting block 23 has a final anti-retraction hole 239 for the anti-retraction protrusion 351 to be inserted. The final anti-retraction hole 239 is opened on the cavity wall of the sliding cavity 231. The anti-retraction drive 31 pushes the anti-retraction block 35 to move and drives the anti-retraction protrusion 351 to enter and exit the final anti-retraction hole 239. When the anti-retraction protrusion 351 enters the final anti-retraction hole 239, the anti-retraction protrusion 351 fills the anti-retraction hole 244 and the anti-retraction insertion hole 245. When the anti-retraction protrusion 351 leaves the final anti-retraction hole 239, the anti-retraction protrusion 351 is still partially located in the anti-retraction hole 244 and the anti-retraction insertion hole 245, maintaining the association state between the anti-retraction block 35, the core-pulling block 24, and the core-pulling protrusion 241.

[0057] Meanwhile, the lower left block 236 has a lower limiting arc opening 2361 near the guide notch 238, and the upper block 232 has an upper limiting arc opening 2321. The upper left part of the anti-reverse block 35 protrudes as a stroke protrusion 352, and the top of the anti-reverse block 35 is higher than the stroke protrusion 352. By the limiting protrusion abutting against the lower limiting arc opening 2361 or the anti-reverse block 35 abutting against the upper limiting arc opening 2321, the upper and lower stroke of the core-pulling block 24 is further limited. At the same time, when the drive rod 22 is not installed, the core-pulling block 24 can also be stably installed on the mounting block 23, which facilitates the assembly process.

[0058] A limiting block 253 on the piston rod of the drive cylinder 21 extends out a column to cooperate with the anti-retraction block 35, thereby driving the anti-retraction protrusion 351 to insert into the final anti-retraction hole 239. The drive groove 222 opened at the end of the drive rod 22 near the drive cylinder 21 is longer than the drive block 211, so that the drive groove 222 has a certain space for the drive block 211 to slide. The drive groove 222 has an opening in the groove wall facing the end of the drive block 211 and a strong spring 6 is installed. The strong spring 6 pushes the drive block 211 to abut against the other groove wall of the drive groove 222. When the drive rod 22 drives the core-pulling block 24 to move down to the final position, the drive block 211 continues to move and squeezes the strong spring 6 to compress. At the same time, the limiting block 253, as the strong spring 6 is compressed, drives the anti-retraction protrusion 351 on the anti-retraction block 35 to begin to insert into the final anti-retraction hole 239. The limiting block 253, the drive block 211 and the strong spring 6 cooperate to form the anti-retraction drive component 31.

[0059] Meanwhile, to reset the anti-reverse block 35, the core-pulling block 24 has spring holes 246 on both sides of the anti-reverse hole 244, and springs are installed in the spring holes 246. The anti-reverse block 35 has a protruding reset post 353 that is inserted into the spring hole 246. The reset post 353 compresses the spring in the spring hole 246, so that the anti-reverse protrusion 351 is inserted into the final anti-reverse hole 239. When the limiting plate no longer drives the anti-reverse block 35, the anti-reverse block 35 automatically resets. At the same time, the portion of the reset post 353 of the anti-reverse block 35 near the lower left block 236 is located between the lower left block 236 and... Between the core-pulling blocks 24, the lower left block 236 has a limiting groove 2362, which allows the reset post 353 to slide together with the core-pulling block 24 within the limiting groove 2362. At the same time, the reset post 353 is limited by the lower left block 236, so that the anti-reverse block 35 will not fall off on the mounting block 23 by itself, achieving all-round anti-reverse restriction of the anti-reverse block 35, but without the need for additional limiting structures for fixation. During assembly, the anti-reverse block 35 and the core-pulling block 24 can be installed together on the lower block 233 to maintain stability, waiting for the installation of the upper block 232.

[0060] The implementation principle of the die-casting mold core-pulling device driven by a hydraulic cylinder and a helical gear in this application embodiment is as follows: the driving cylinder 21 drives the driving rod 22 to move relative to the mounting block 23, and the part of the driving rod 22 in the sliding cavity 231 performs a reciprocating interlocking motion. During this movement of the driving rod 22, through the mutual cooperation of the pushing inclined groove 223 and the pushing inclined protrusion 242 formed between it and the core-pulling block 24, the core-pulling block 24 can move vertically within the sliding cavity 231, ultimately realizing the core-pulling and resetting motion of the core-pulling block 24. The relative positions of the drive cylinder 21 allow it to be installed on the side of the fixed mold frame 4, ultimately enabling the upward pulling of the core-pulling block 24 from the side of the fixed mold frame 4. The anti-retraction structure 3 prevents the core-pulling block 24 from retracting during die casting, ensuring the stability of the die casting process. The anti-retraction block 35 of the anti-retraction structure 3 is driven by the limiting block 253 on the piston rod of the drive cylinder 21 to achieve insertion anti-retraction, combining the functions of core pulling and anti-retraction, reducing the number of drive components, requiring fewer external parts of the mold, and requiring less space.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A core-pulling device for a die-casting mold driven by a hydraulic cylinder and a helical gear, characterized in that: The system includes a backstop structure (3) and a core-pulling structure (2). The core-pulling structure (2) includes a core-pulling block (24), a mounting block (23), a drive rod (22), and a drive cylinder (21). The mounting block (23) is mounted on the fixed mold frame (4) and forms a sliding cavity (231) for the core-pulling block (24) to slide. One end of the core-pulling block (24) has a protruding core-pulling post (241). The end of the core-pulling block (24) with the core-pulling post (241) fills a part of the fixed mold core (5) and forms a cavity. The core-pulling post (241) penetrates the fixed mold core (5) and enters the cavity. The drive cylinder (21) is mounted on the fixed mold frame (4). The drive rod (22) is mounted on the side wall of the fixed mold frame (4) and drives the drive rod (22) to move. The drive rod (22) passes through the sliding cavity (231) of the mounting block (23). The drive rod (22) and the core-pulling block (24) form a mutually cooperating push groove (223) and push protrusion (242). The extension direction of the push protrusion (242) is inclined at a certain angle relative to the moving direction of the drive rod (22). The push protrusion (242) slides with the drive rod (22) and changes its height in the sliding cavity (231), thereby driving the core-pulling block (24) to move up and down in the sliding cavity (231). The drive rod (22) is located next to the core-pulling block (24). The pushing oblique protrusion (242) is disposed on the side wall of the core-pulling block (24) facing the drive rod (22). The lower point of the pushing oblique protrusion (242) is disposed close to the drive cylinder (21), and the angle between the pushing oblique protrusion (242) and the moving direction of the drive rod (22) is less than 45 degrees. The anti-reverse structure (3) includes an anti-reverse surface (33) and a limiting surface (34). The mounting block (23) has a drive sliding hole (234) through which the drive rod (22) passes. The drive sliding hole (234) and the sliding... The cavity (231) is connected, the drive rod (22) is a cylindrical rod, the anti-retraction surface (33) is opened on the drive rod (22), and the push groove (223) is opened on the side of the drive rod (22) away from the anti-retraction surface (33). The limiting surface (34) is part of the hole wall of the drive sliding hole (234), and the limiting surface (34) is in contact with the anti-retraction surface (33). The anti-retraction surface (33) is parallel to the moving direction of the drive rod (22), and the part of the drive sliding hole (234) away from the limiting surface (34) is spaced apart from the drive rod (22). The mounting block (23) includes an upper block (232) and a lower block (233). The upper block (232) and the lower block (233) are assembled and fixed, and the driving sliding hole (234) is formed between the upper block (232) and the lower block (233). The limiting surface (34) is provided on the upper block (232). The lower block (233) has a contact arc surface (7) on the part of the hole wall of the driving sliding hole (234) near the upper block (232). The contact arc surface (7) fits the part of the driving rod (22) without the pushing groove (223). The lower block (233) has an arc-shaped notch (235) on the surface of the driving sliding hole (234). The arc-shaped notch (235) is located next to the contact arc surface (7).

2. The die-casting mold core-pulling device with hydraulic cylinder driving helical gear according to claim 1, characterized in that: There are multiple pushing oblique protrusions (242), which are equally spaced apart. There are multiple pushing oblique grooves (223), which correspond one-to-one with the multiple pushing oblique protrusions (242).

3. The die-casting mold core-pulling device with a hydraulic cylinder driving a helical gear according to claim 1, characterized in that: The drive cylinder (21) is provided with a guide limiting component (25), which includes a guide rod (251), a guide block (252) and a limiting block (253). The guide block (252) is installed on the cylinder body of the drive cylinder (21) and cooperates with the guide rod (251). The limiting block (253) is installed on the piston rod of the drive cylinder (21) and cooperates with the guide rod (251). There is only one sliding fit between the guide block (252) and the guide rod (251) and between the limiting block (253) and the guide rod (251).

4. The die-casting mold core-pulling device with hydraulic cylinder driving helical gear according to claim 3, characterized in that: The guide limiting component (25) also includes a stroke detection block (26), which is installed on the guide rod (251) and moves synchronously with the limiting block (253). The cylinder body of the drive cylinder (21) is provided with a position sensor (27) for detecting the position of the stroke detection block (26).

5. The die-casting mold core-pulling device with a hydraulic cylinder driving a helical gear according to claim 1, characterized in that: The lower block (233) includes a lower left block (236) and a lower right block (237). The driving sliding hole (234) is opened in the lower left block (236). The lower block (233) has a guide notch (238) located between the lower left block (236) and the lower right block (237). The core-pulling block (24) is provided with a sliding stop block (35) that slides together. The stop block (35) is located in the guide notch (238).

6. A die-casting mold core-pulling device with a hydraulic cylinder driving a helical gear according to claim 5, characterized in that: The anti-retraction structure (3) includes the anti-retraction block (35), the core-pulling block (24) has a core-pulling mounting hole (243) for installing the core-pulling post (241), the core-pulling block (24) has an anti-retraction hole (244) communicating with the core-pulling mounting hole (243) on the side facing the anti-retraction block (35), the core-pulling post (241) has an anti-retraction insertion hole (245), and the anti-retraction block (35) has an anti-retraction protrusion (351) protruding from it. The anti-reverse protrusion (351) passes through the anti-reverse hole (244) and the anti-reverse insertion hole (245) in sequence and penetrates the core-pulling block (24). The mounting block (23) has a final anti-reverse hole (239) for the anti-reverse protrusion (351) to be inserted. The mounting block (23) is provided with an anti-reverse drive (31) to push the anti-reverse block (35) to move and drive the anti-reverse protrusion (351) to enter and exit the final anti-reverse hole (239).

7. A die-casting mold core-pulling device with a hydraulic cylinder driving a helical gear according to claim 6, characterized in that: A limiting block (253) is provided on the piston rod of the driving cylinder (21). When the limiting block (253) moves to the final position with the piston rod of the driving cylinder (21), it drives the anti-retraction protrusion (351) to insert into the final anti-retraction hole (239). A driving block (211) is provided on the piston rod of the driving cylinder (21). The diameter of the driving block (211) is larger than the diameter of the piston rod of the driving cylinder (21). A driving groove (222) is opened at one end of the driving rod (22) near the driving cylinder (21) for the driving block (211) to be engaged. The driving groove (222) has a certain space for the driving block (211) to slide. A strong spring (6) is installed on the groove wall of the slot (222) facing the end of the drive block (211). The strong spring (6) pushes the drive block (211) to abut against the other groove wall of the drive slot (222). When the drive rod (22) drives the core-pulling block (24) to move down to the final position, the drive block (211) continues to move and squeezes the strong spring (6) to compress. At the same time, the limiting block (253) drives the anti-retraction protrusion (351) to begin to insert into the final anti-retraction hole (239) as the strong spring (6) is compressed. The limiting block (253), the drive block (211) and the strong spring (6) cooperate to form the anti-retraction drive member (31).

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