Core pulling device and gear mold

Abstract

The application discloses a core pulling device and a gear mold, and relates to the technical field of gear molds. The core pulling device comprises a sliding seat, a core assembly, a transmission assembly and a locking structure. The sliding seat can move along a first direction. The core assembly comprises a threaded core. The threaded core moves along the first direction. An outer surface of a matching end of the threaded core is provided with external threads, which are used for extending into a cavity of the gear mold. The transmission assembly comprises a rack and a gear set. The rack extends along a second direction. An end of the rack is used for connecting a fixed mold assembly of the gear mold. The gear set is arranged on the sliding seat. The gear set can be transmissionally connected with the rack and a connecting end of the threaded core. The locking structure can lock the gear set when the sliding seat is at a second position. The pulling-out process of the threaded core is automatically completed by means of the mold opening process of the gear mold. The structure of the gear rack transmission is more simple. The structure can meet the precision requirement and ensure the stability during the mold opening and closing processes of the gear mold.

Description

Technical Field

[0001] This invention relates to the field of gear mold technology, and particularly to a core-pulling device and a gear mold. Background Technology

[0002] Gear molds are crucial basic components in mechanical transmission systems, and their design and manufacturing directly affect product performance, production efficiency, and manufacturing costs. For complex products, gear molds have intricate structural designs and extremely high precision requirements. Traditional gear molds often suffer from problems such as uneven core pulling and severe mold wear during the core-pulling process, which not only affects product quality but also increases production costs and manufacturing cycles. Summary of the Invention

[0003] The main objective of this invention is to provide a core-pulling device and a gear mold, which simplifies the core-pulling structure of the gear mold, optimizes the production process, and improves the reliability of the mold.

[0004] To achieve the above objectives, the present invention provides a core-pulling device and a gear mold for use in gear molds. The core-pulling device includes:

[0005] A sliding seat is used to connect the moving mold assembly of the gear mold. The sliding seat is movable in a first direction. During the moving stroke, the sliding seat has a first position that engages with the gear mold and a second position that is away from the gear mold.

[0006] A core assembly includes a threaded core that moves along a first direction. The threaded core has a mating end and a connecting end that are disposed opposite to each other along the first direction. The outer surface of the mating end is provided with an external thread for extending into the cavity of a gear mold.

[0007] A transmission assembly, comprising a rack and a gear set, wherein the rack extends along a second direction, and the end of the rack is used to connect to the fixed mold assembly of the gear mold, and the gear set is disposed on the sliding seat, and the gear set is capable of drivingly connecting the rack and the connecting end, for driving the mating end of the threaded core to be extracted from the cavity of the gear mold when the fixed mold assembly and the moving mold assembly are separated;

[0008] A locking structure is provided on the sliding seat, which can lock the gear set when the sliding seat is in the second position.

[0009] In one embodiment, the core assembly further includes a shaft core extending along a first direction, one end of which is fixed to the sliding seat, and the threaded core is cylindrical and can be movably sleeved on the outside of the shaft core along the first direction.

[0010] The sliding seat changes from the first position to the second position to drive the shaft core to move and be pulled out of the cavity of the gear mold.

[0011] In one embodiment, the gear set includes a first gear and two second gears, the first gear being fixed to the outside of the connecting end; the two second gears are coaxially connected, one of the second gears meshing with the first gear, and the other second gear meshing with the rack;

[0012] When the sliding seat is in the second position, at least one of the two second gears can be locked by the locking structure.

[0013] In one embodiment, the two second gears include a first mating gear and a second mating gear, wherein the outer diameter of the first mating gear is larger than that of the second mating gear;

[0014] The first mating gear meshes with the first gear and can be locked by the locking structure when the sliding seat is in the second position, and the second mating gear meshes with the rack.

[0015] In one embodiment, the locking structure includes a locking member, the middle portion of which is rotatably mounted on the sliding seat along an axis extending in a third direction. The locking member has a locking end and a driving end located on opposite sides of its rotation center. The locking end is provided with teeth that mesh with the corresponding second gear. The driving end is movable under external force so as to drive the locking end to lock the corresponding second gear.

[0016] In one embodiment, the locking structure further includes a limiting block for fixing to the moving mold assembly of the gear mold and spaced apart from the sliding seat in a first direction. The end of the limiting block facing the sliding seat is provided with a first mating slope, which is inclined toward the fixed mold assembly in a direction away from the sliding seat.

[0017] The driving end is provided with a second mating slope corresponding to the first mating slope;

[0018] During the movement of the sliding seat, the first and second mating inclined surfaces can fit together to drive the locking end to swing toward the corresponding second gear.

[0019] In one embodiment, the locking structure further includes an elastic element, one end of which is connected to the locking element and the other end of which is connected to the sliding seat.

[0020] In one embodiment, the sliding seat has a receiving cavity, and a through hole is provided on one side wall of the receiving cavity in a first direction. The through hole allows the threaded core to move through. The outer surface of the sliding seat is provided with an opening communicating with the receiving cavity.

[0021] A portion of the gear set extends out of the opening from the sliding seat;

[0022] The locking structure engages with the portion of the gear set that extends out of the sliding seat.

[0023] In one embodiment, at least two threaded cores are provided, and the two threaded cores are spaced apart along a third direction;

[0024] The gear set is capable of driving the connection between the rack and the two threaded cores.

[0025] The present invention also proposes a gear mold, including a core-pulling device, said core-pulling device comprising at least:

[0026] A sliding seat for connecting a moving mold assembly to a gear mold, the sliding seat being movable in a first direction, the sliding seat having a first position engaging with the gear mold and a second position distancing itself from the gear mold;

[0027] A core assembly includes a threaded core that moves along a first direction. The threaded core has a mating end and a connecting end that are arranged opposite to each other along the first direction. The outer surface of the mating end is provided with an external thread for extending into the cavity of a gear mold.

[0028] A transmission assembly, comprising a rack and a gear set, wherein the rack extends along a second direction, and the end of the rack is used to connect to the fixed mold assembly of the gear mold, and the gear set is disposed on the sliding seat, and the gear set is capable of drivingly connecting the rack and the connecting end, for driving the mating end of the threaded core to be extracted from the cavity of the gear mold when the fixed mold assembly and the moving mold assembly are separated;

[0029] A locking structure is provided on the sliding seat, which can lock the gear set when the sliding seat is in the second position.

[0030] In the technical solution of this invention, when the gear mold is closed, the sliding seat is located on one side of the moving mold assembly in the first direction and is in the first position. The mating end of the threaded core is located inside the cavity of the gear mold, thereby forming an internal thread on the product during the product molding process. When the gear mold is opened, the moving mold assembly moves relative to the fixed mold assembly. Since the rack and the fixed mold assembly remain fixed, the rack and gear set are driven together, thereby driving the threaded core to rotate along the axis extending in the first direction and move away from the gear mold to disengage from the product. After the rack and gear set are completely disengaged, the threaded core and the product are also completely disengaged. The sliding seat moves away from the gear mold, thereby ensuring that the relevant components of the core-pulling device avoid the gear mold, facilitating the demolding of the product in the gear mold. When the sliding seat reaches the second position, the gear set is locked by a locking structure, which can prevent some parts in the gear set from rotating when the sliding seat vibrates, causing the gear set and rack to not correspond after the sliding seat is reset. The extraction process of the threaded core is automatically completed by the opening process of the gear mold. The structure of the gear and rack drive is simpler, which can meet the accuracy requirements and ensure the stability of the gear mold during the opening and closing process. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 An exploded view of the first embodiment of the core-pulling device provided by the present invention;

[0033] Figure 2 for Figure 1 Schematic diagram of the core-pulling device;

[0034] Figure 3 for Figure 2 Cross-sectional schematic diagram of the core-pulling device;

[0035] Figure 4 for Figure 2 A partial cross-sectional schematic diagram of the core-pulling device;

[0036] Figure 5 for Figure 1 A schematic diagram of the locking mechanism.

[0037] Explanation of icon numbers:

[0038] 100. Core pulling device; 1. Sliding seat; 11. Opening; 2. Core assembly; 21. Threaded core; 211. Mating end; 212. Connecting end; 22. Shaft core; 23. Roller bearing; 24. Needle roller bearing; 3. Transmission assembly; 31. Rack; 32. First gear; 33. Second gear; 331. First mating gear; 332. Second mating gear; 4. Locking structure; 41. Locking element; 411. Locking end; 412. Drive end; 4120. Second mating slope; 413. Tooth; 414. Protrusion; 42. Limiting block; 421. First mating slope; 43. Elastic element; 5. Hydraulic cylinder; 6. Mating block; 1000. Gear mold.

[0039] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] Gear molds are crucial basic components in mechanical transmission systems, and their design and manufacturing directly affect product performance, production efficiency, and manufacturing costs. Traditional gear mold designs have the following drawbacks:

[0044] Long processing and molding cycle: Traditional gear molds have complex structures and complicated manufacturing processes, resulting in long processing and molding cycles, which affects production efficiency.

[0045] High cost: Complex mold design and manufacturing processes increase production costs, especially in mass production, where cost issues are particularly prominent.

[0046] High quality risk: Traditional gear molds are prone to problems such as mold crushing and tooth breakage during the production process, resulting in unstable product quality and increased maintenance and rework costs.

[0047] Therefore, how to simplify the gear mold structure, optimize the production process, and improve the reliability and maintainability of the mold has become an urgent problem to be solved.

[0048] To optimize the structure of gear molds, this invention starts with the core-pulling part and optimizes the structure of the core-pulling part, which can adapt to the demolding requirements of long-sized products and ensure the stability of mold closing.

[0049] In this invention, the first direction, the second direction, and the third direction are three intersecting directions in space. In the accompanying drawings of this embodiment, the second direction is the up-down direction, the first direction is the left-right direction, and the third direction is the front-back direction. The moving mold assembly of the gear mold opens along the second direction. Depending on the different placement methods of the gear mold during use, the second direction can also be the left-right direction, in which case the first direction is the up-down direction, and the third direction is the front-back direction.

[0050] Please refer to Figures 1 to 2 The core-pulling device 100 includes a sliding seat 1, a core assembly 2, a transmission assembly 3, and a locking structure 4. The sliding seat 1 is used to connect the moving mold assembly of the gear mold 1000. The sliding seat 1 is movable along a first direction. During its active stroke, the sliding seat 1 has a first position that engages with the gear mold 1000 and a second position that is away from the gear mold 1000. The core assembly 2 includes a threaded core 21. The threaded core 21 is movable along the first direction. The threaded core 21 has a mating end 211 and a connecting end 212 that are arranged opposite to each other along the first direction. The outer surface of the mating end 211 is provided with... The external thread is used to extend into the cavity of the gear mold 1000; the transmission assembly 3 includes a rack 31 and a gear set, the rack 31 extends along the second direction, the end of the rack 31 is used to connect to the fixed mold assembly of the gear mold 1000, the gear set is provided on the sliding seat 1, the gear set can drive the rack 31 and the connecting end 212 to drive the mating end 211 of the threaded core 21 to be pulled out from the cavity of the gear mold 1000 when the fixed mold assembly and the moving mold assembly are separated; the locking structure 4 is provided on the sliding seat 1, and the locking structure 4 can lock the gear set when the sliding seat 1 is in the second position.

[0051] In the technical solution of this invention, when the gear mold 1000 is closed, the sliding seat 1 is located on one side of the moving mold assembly in the first direction and is in the first position. The mating end of the threaded core 21 is located in the cavity of the gear mold 1000, thereby forming an internal thread on the product during the product molding process. When the gear mold 1000 is opened, the moving mold assembly moves relative to the fixed mold assembly. Since the rack 31 and the fixed mold assembly remain fixed, the rack 31 and the gear set are driven together, thereby driving the threaded core 21 to rotate along the axis extending in the first direction, and at the same time moving away from the gear mold 1000 to disengage from the product. After the rack 31 and the gear set are completely disengaged, the threaded core 21 is also completely disengaged from the product, and the sliding seat 1 moves away from the gear mold 1000, thereby ensuring that the relevant components of the core-pulling device 100 avoid the gear mold 1000, facilitating the demolding of the product in the gear mold 1000.

[0052] It should be noted that the gear and rack 31 is a precision mating structure. After the gear and rack 31 are separated, the gear will not deflect under the action of no external force and can maintain the angular state when separated from the rack 31. When the sliding seat 1 is set, when the sliding seat 1 is partially in contact with the fixed mold assembly, the sliding seat 1 can be limited to the first position. In order to ensure the movement of the sliding seat 1 along the first direction, a guide rail, guide groove and other structures are usually matched. In order to limit the sliding seat 1 to the second position, on the one hand, the movement stroke of the hydraulic cylinder 5 that drives the movement of the sliding seat 1 can be limited, and on the other hand, a mechanical limiting structure can be set. When the sliding seat 1 collides with the mechanical limiting structure, the sliding seat 1 cannot continue to move, thus allowing it to stay in the second position. Based on this design requirement, when the sliding seat 1 reaches the second position, the sliding seat 1 needs to rapidly reduce its original speed to 0 to stop. This instantaneous deceleration will cause the sliding seat 1 to vibrate under the action of inertia. If a mechanical limiting structure is designed, the collision between the sliding seat 1 and the mechanical limiting structure will also cause it to vibrate violently. Since the components of the gear set are all rotating and engaged, under this violent vibration, the components in the gear set may deflect. This deflection will cause the rack 31 to be unable to re-mesh with the gear set, which will result in the mold being unable to close.

[0053] To accommodate the product's elongated dimensions in the first direction, this design necessitates the separation and re-engagement of the gear set and rack 31. Therefore, a locking structure 4 is added to the transmission assembly 3. When the sliding seat 1 stops, the locking structure 4 locks the gear set, preventing the gear set from shifting due to vibration of the sliding seat 1. This keeps the gear set in the position it was in when separated from the rack 31. After the sliding seat 1 returns to its first position, the moving mold assembly resets, and the rack 31 re-engages with the gear. This allows the mating end of the threaded core 21 to re-enter the cavity of the gear mold 1000, completing the mold closing process of the gear mold 1000. This satisfies both precision requirements and ensures stability during the mold opening and closing process. The gear and rack 31 transmission structure is simpler, thus optimizing the gear mold 1000.

[0054] It should be understood that when the sliding seat 1 returns to a stationary position, or when the sliding seat 1 is reset to the first position, the locking structure 4 unlocks the gear set, thereby preventing the gear set from being unable to cooperate with the rack 31 for transmission during the mold closing process due to the restriction of the locking structure 4.

[0055] Furthermore, the length of the threaded core 21 is not limited. In some embodiments, the product forms a through hole with internal threads after molding, and in some embodiments, the product forms a groove with internal threads after molding.

[0056] In this embodiment, please refer to Figure 3 The core assembly 2 also includes a shaft core 22 extending along a first direction. One end of the shaft core 22 is fixed to the sliding seat 1. The threaded core 21 is cylindrical and can be movably sleeved on the outside of the shaft core 22 along the first direction. The sliding seat 1 changes from the first position to the second position to remove the shaft core 22 from the cavity of the gear mold 1000. The length of the shaft core 22 in the first direction is greater than the length of the threaded core 21 in the first direction, so that the product has a through hole after molding, and the end of the through hole has an internal thread. For example, the total length of the product in the first direction is 70 mm, and the corresponding length of the through hole formed by the product is 70 mm, and one end of the through hole has an internal thread with a length of 40 mm. During the mold closing process, the sliding seat 1 is in the first position, at which time a portion of the shaft core 22 and a portion of the threaded core 21 are located in the cavity of the gear mold 1000, and both participate in the molding of the product. When product molding requires demolding, the threaded core 21 is first rotated and pulled out. After the threaded core 21 is withdrawn, the sliding seat 1 is driven to switch from the first position to the second position, thereby driving the shaft core 22 to be pulled out of the cavity of the gear mold 1000. This structural design cleverly utilizes the length difference and movable nesting relationship between the shaft core 22 and the threaded core 21 to achieve precise molding of the product's through holes and internal threads, while also ensuring smooth demolding.

[0057] Based on the above embodiments, the connection between the threaded core 21 and the shaft core 22 is achieved through bearings. Please refer to... Figure 3 In this embodiment, the combination of roller bearing 23 and needle roller bearing 24 enables both the rotational engagement of the threaded core 21 and the shaft core 22, and the limiting engagement of the shaft core 22 with the sliding seat 1. This improves the motion accuracy and stability of the entire core assembly 2, reduces mold wear, and extends the service life of the mold.

[0058] The connection method between the rack 31 and the fixed mold assembly is not limited. For example, a mounting groove can be provided at the corresponding position of the fixed mold assembly, and a portion of the rack 31 can be inserted into the mounting groove and secured with screws.

[0059] The length of the rack 31 in the second direction should be greater than the travel of the threaded core 21 in the first direction, so as to ensure the stability of the entire device operation.

[0060] The gear set primarily achieves transmission between the rack 31 and the threaded core 21 through the engagement of multiple gears. Please refer to... Figure 1 and Figure 4 The gear set includes a first gear 32 and two second gears 33. The first gear 32 is fixed to the outside of the connecting end 212, so that it can rotate synchronously with the threaded core 21. The two second gears 33 are coaxially connected and can rotate coaxially along an axis extending in a first direction. One second gear 33 meshes with the first gear 32, and the other second gear 33 meshes with the rack 31, thus accommodating the positional difference between the threaded core 21 and the rack 31 in the first direction. Since the two second gears 33 are coaxially driven, at least one of the two second gears 33 can be locked by the locking structure 4 when the sliding seat 1 is in the second position.

[0061] It should be understood that the threaded core 21 can be subjected to the rotational driving force of the corresponding second gear 33 and the thread driving force that mates with the product thread. During the process of the threaded core 21 being subjected to the combined force, the first gear 32 and the corresponding second gear 33 always maintain the engagement effect. Therefore, the length of the first gear 32 in the first direction needs to be long enough so that the second gear 33 and the corresponding second gear 33 will not separate during the movement of the threaded core 21.

[0062] The core-pulling device 100 may also be equipped with a mating block 6, which can be fixed relative to the sliding seat 1. The mating block 6 is sleeved on the outside of the threaded core 21, and has internal threads. The threaded core 21 has external threads at its center. Through the engagement of the mating block 6 and the threaded core 21, the threaded core 21 can be rotated out, thereby driving the threaded core 21 out of the hole in the product. Therefore, damage to the product caused by directly relying on the internal threads of the product's hole to drive the threaded core 21 can be avoided.

[0063] Considering space constraints and the functional differences between the two second gears 33, please refer to Figure 1 and Figure 4 The two second gears 33 include a first mating gear 331 and a second mating gear 332. The outer diameter of the first mating gear 331 is larger than that of the second mating gear 332. The first mating gear 331 meshes with the first gear 32 and can be locked by the locking structure 4 when the sliding seat 1 is in the second position. The second mating gear 332 meshes with the rack 31. During mold closing and opening, the second mating gear 332 can accurately convert the linear motion of the rack 31 into its own rotational motion, thereby driving the first mating gear 331 to rotate and providing a suitable driving force for the threaded core 21. The larger outer diameter of the first mating gear 331 allows it to withstand greater torque when meshing with the first gear 32, ensuring that the transmission between the first gear 32 and the first mating gear 331 is more stable and reliable when the threaded core 21 is subjected to combined forces.

[0064] This invention does not limit the specific form of the locking structure 4. In this embodiment, please refer to... Figure 3 and Figure 5 The locking structure 4 includes a locking member 41. The middle part of the locking member 41 is rotatably mounted on the sliding seat 1 along the axis of the third extension direction. The locking member 41 has a locking end 411 and a driving end 412 respectively disposed on both sides of its rotation center. The locking end 411 is provided with teeth 413 that mesh with the corresponding second gear 33. Driving the driving end 412 to move can drive the locking end 411 to lock the corresponding second gear 33. The locking member 41 forms a lever structure. By driving the driving end 412 to move at an appropriate time, the locking end 411 can be driven to swing, thereby realizing the engagement and locking of the teeth 413 with the corresponding second gear 33, or the disengagement and unlocking of the teeth 413 with the corresponding second gear 33.

[0065] It should be noted that the tooth 413 can be a single protrusion that can engage with the external teeth of the second gear 33, or the tooth 413 can be multiple protrusions that engage with the external teeth of the second gear 33 together. The present invention does not limit this.

[0066] In practical applications, the activity of the drive end 412 can be achieved in various ways, such as through active driving by a cylinder or other driving device. In this embodiment, please refer to... Figure 2 and Figure 3 The locking structure 4 also includes a limiting block 42, which is used to fix to the moving mold assembly of the gear mold 1000 and is spaced apart from the sliding seat 1 in the first direction. The end of the limiting block 42 facing the sliding seat 1 is provided with a first mating inclined surface 421, which is inclined towards the fixed mold assembly in a direction away from the sliding seat 1. The driving end 412 is provided with a second mating inclined surface 4120 corresponding to the first mating inclined surface 421. During the movement of the sliding seat 1, the first mating inclined surface 421 and the second mating inclined surface 4120 can fit together to drive the locking end 411 to swing in the direction of the corresponding second gear 33. Taking the second direction as the up-down direction as an example, the cooperation of the structural components is explained. During the movement of the sliding block to the second position, the driving end 412 and the limiting block 42 begin to contact. When the sliding block stops at the second position, the first mating inclined surface 421 and the second mating inclined surface 4120 fit tightly together. Based on the inclined surface cooperation of the two, the limiting block 42 applies an upward driving force to the driving end 412, thereby causing the locking end 411 to move downward and engage with the corresponding second gear 33, thereby locking the entire gear set and ensuring that the position of the second gear 33 that cooperates with the rack 31 is fixed.

[0067] Based on the above embodiments, in order to achieve automatic unlocking of the locking member 41, the locking structure 4 further includes an elastic member 43. One end of the elastic member 43 is connected to the locking member 41, and the other end is connected to the sliding seat 1. The elastic member 43 is located between the rotation center of the locking member 41 and the locking end 411, so that the locking end 411 can maintain a certain distance from the second gear 33 under the action of elastic force. When the driving end 412 cooperates with the limiting block 42, the locking end 411 can overcome the elastic force and contact and lock with the second gear 33.

[0068] In this embodiment, a protrusion 414 is provided on the locking member 41 to facilitate the positioning and installation of the elastic member 43.

[0069] The sliding seat 1 serves as the mounting base for the entire core-pulling device 100. Driven by the hydraulic cylinder 5, the shape of the sliding seat 1 can be reasonably set according to the design requirements of the gear mold 1000. Sloping surfaces and grooves can be correspondingly set on the sliding seat 1 for structural cooperation or structural avoidance.

[0070] Furthermore, the sliding seat 1 has a receiving cavity, and a through hole is provided on one side wall of the receiving cavity in the first direction for the threaded core 21 to move through. The outer surface of the sliding seat 1 has an opening 11 communicating with the receiving cavity; a portion of the gear set extends out of the sliding seat 1 from the opening 11; the locking structure 4 engages with the portion of the gear set extending out of the sliding seat 1. Based on Figure 1In one embodiment, the locking member 41 is located on the top of the sliding seat 1, a portion of the first mating gear 331 is exposed from the opening 11, the second mating gear 332 is hidden in the receiving cavity, and the sliding seat 1 is also provided with a through hole corresponding to the second mating gear 332 for the rack 31 to pass through.

[0071] To improve production efficiency, where space permits, gear molds 1000 are often designed with a double-cavity or multi-chamber structure. Based on this, at least two threaded cores 21 are provided, spaced apart along a third direction. The gear set can drive the connection between the rack 31 and the connecting ends 212 of the two threaded cores 21. Figure 2 In one embodiment, the connecting ends 212 of the two threaded cores 21 are respectively provided with first gears 32, and the first mating gears 331 mesh with the two first gears 32 on opposite radial sides.

[0072] When three threaded cores 21 are provided, the gear set should include more gears to meet the requirements of transmission and engagement, which will not be described in detail here.

[0073] The present invention also proposes a gear mold 1000, which includes a moving mold assembly, a fixed mold assembly, and a core-pulling device 100. The specific structure of the core-pulling device 100 is as described in the above embodiments. Since the gear mold 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0074] Specifically, Figure 1 This shows the fit and engagement of each component when the gear mold 1000 is closed.

[0075] The mold opening process is as follows:

[0076] The moving mold assembly drives the sliding seat 1 to move away from the fixed mold assembly. The rack 31 engages with the second mating gear 332, causing the second mating gear 332 to rotate. Based on the coaxial connection of the first mating gear 331 and the second mating gear 332, the first mating gear 331 can drive the third gear to rotate, causing the threaded core 21 to rotate and thus exit the product. During this process, the locking member 41 does not contact the first mating gear 331. After the threaded core 21 is completely separated from the product, and the rack 31 is separated from the second mating gear 332, the hydraulic cylinder 5 retracts, driving the sliding seat 1 to move as a whole, thereby pulling the shaft core 22 out of the product. When the sliding seat 1 reaches the second position, the locking end 411 of the locking member 41 is simultaneously driven to move towards the first mating gear 331, thereby locking the first mating gear 331. Finally, the product is demolded from the fixed mold assembly by the ejector pin in the gear mold 1000.

[0077] The mold closing and reset process is as follows:

[0078] After the ejector pin resets, the cylinder 5 extends, the sliding seat 1 moves, and the locking part 41 separates from the limit block 42. Under the action of the elastic force, the locking end 411 separates from the first mating gear 331, releasing the lock. After the sliding seat 1 returns to the first position, the moving mold assembly drives the sliding seat 1 to move towards the fixed mold assembly. The rack 31 re-meshes with the second mating gear 332. As the moving mold assembly continues to move, the second mating gear 332 is driven to rotate, and the first mating gear 331 rotates synchronously, thereby driving the threaded core 21 to extend out of the sliding seat 1. When all parts return to the initial state, they are ready for the next processing.

[0079] In the technical solution of the present invention, the automatic extraction of the threaded core 21 and the shaft core 22 is achieved by combining the mold opening process of the gear mold 1000 with the oil cylinder 5, which reduces the complexity of the drive system. The transmission relies on the cooperation of gears and racks 31, which has a simple structure, high gear meshing accuracy, high reliability of the entire processing process, and stable structure. It is suitable for the production of products that require thread demolding.

[0080] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A core-pulling device for gear molds, characterized in that, The core-pulling device includes: A sliding seat is used to connect the moving mold assembly of the gear mold. The sliding seat is movable in a first direction. During the moving stroke, the sliding seat has a first position that engages with the gear mold and a second position that is away from the gear mold. A core assembly includes a threaded core that moves along a first direction. The threaded core has a mating end and a connecting end that are disposed opposite to each other along the first direction. The outer surface of the mating end is provided with an external thread for extending into the cavity of a gear mold. A transmission assembly, comprising a rack and a gear set, wherein the rack extends along a second direction, and the end of the rack is used to connect to the fixed mold assembly of the gear mold, and the gear set is disposed on the sliding seat, and the gear set is capable of drivingly connecting the rack and the connecting end, for driving the mating end of the threaded core to be extracted from the cavity of the gear mold when the fixed mold assembly and the moving mold assembly are separated; A locking structure is provided on the sliding seat, which can lock the gear set when the sliding seat is in the second position; The gear set includes a first gear and two second gears. The first gear is fixed to the outside of the connecting end; the two second gears are coaxially connected. The two second gears include a first mating gear and a second mating gear, wherein the outer diameter of the first mating gear is larger than that of the second mating gear; the first mating gear meshes with the first gear, and the second mating gear meshes with the rack. The locking structure includes a locking member, the middle part of which is rotatably mounted on the sliding seat along the axis of the third extension direction. The locking member has a locking end and a driving end respectively disposed on both sides of its rotation center. The locking end is provided with teeth that mesh with the corresponding second gear. The locking structure further includes a limiting block, which is used to fix to the moving mold assembly of the gear mold and is spaced apart from the sliding seat in a first direction. The end of the limiting block facing the sliding seat is provided with a first mating inclined surface, which is inclined toward the fixed mold assembly in a direction away from the sliding seat. The driving end is provided with a second mating slope corresponding to the first mating slope; During the movement of the sliding seat, the first mating inclined surface and the second mating inclined surface can fit together to drive the locking end to swing in the direction of the corresponding second gear; The moving mold assembly drives the sliding seat to move away from the fixed mold assembly. The rack engages with the second mating gear, causing the second mating gear to rotate. Based on the coaxial connection of the first and second mating gears, the first mating gear can drive the first gear to rotate, causing the threaded core to rotate and thus exit the product. During this process, the locking member does not contact the first mating gear. After the threaded core is completely separated from the product and the rack is separated from the second mating gear, the cylinder retracts, causing the sliding seat to move as a whole, thereby pulling the shaft core out of the product. When the sliding seat reaches the second position, the locking end of the locking member is simultaneously driven to move towards the first mating gear, thereby locking the first mating gear.

2. The core-pulling device as described in claim 1, characterized in that, The core assembly further includes a shaft core extending along a first direction, one end of which is fixed to the sliding seat. The threaded core is cylindrical and can be movably sleeved on the outside of the shaft core along the first direction. The sliding seat changes from the first position to the second position to drive the shaft core to move and be pulled out of the cavity of the gear mold.

3. The core-pulling device as described in claim 1, characterized in that, The locking structure also includes an elastic element, one end of which is connected to the locking element and the other end of which is connected to the sliding seat.

4. The core-pulling device as described in claim 2, characterized in that, The sliding seat has a receiving cavity, and a through hole is provided on one side wall of the receiving cavity in a first direction. The through hole allows the threaded core to move through. The outer surface of the sliding seat has an opening that communicates with the receiving cavity. A portion of the gear set extends out of the opening from the sliding seat; The locking structure engages with the portion of the gear set that extends out of the sliding seat.

5. The core-pulling device as described in claim 1, characterized in that, At least two threaded cores are provided, and the two threaded cores are spaced apart along a third direction; The gear set is capable of driving the connection between the rack and the two threaded cores.

6. A gear mold, characterized in that, Includes the core-pulling device as described in any one of claims 1 to 5.

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