An injection mold with a fixed mold core-pulling mechanism

Abstract

This invention relates to the field of injection mold technology, and discloses an injection mold with a fixed mold core-pulling mechanism. It includes a moving mold assembly and a fixed mold assembly, which close together to form a product cavity. The fixed mold assembly includes a fixed mold frame, a movable moving plate, and a core-pulling assembly. The core-pulling assembly includes a core-pulling rod passing through a mounting hole in the fixed mold frame, a push block fixed to the core-pulling rod, an elastic element abutting against the fixed mold frame and the push block, and a driving block fixed to the moving plate and in contact with the push block. The contact surfaces of the two constitute a thrust transmission path. This invention eliminates the need for hydraulic cylinder drive, solving the problems of large mold size and energy waste. It features a compact structure, stable operation, improved production economy, reduced product defects, and ensured molding quality and production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, and specifically relates to an injection mold with a fixed mold core-pulling mechanism. Background Technology

[0002] In the field of injection molding, for injection molded products with complex structures such as side holes and side grooves, in order to ensure that the product can be demolded smoothly after molding, it is usually necessary to set a core-pulling mechanism in the injection mold. The core-pulling rod is pulled out from the side structure of the product before demolding to avoid defects such as tearing and deformation, and to ensure the product molding quality.

[0003] Currently, most core-pulling mechanisms in existing technologies are located on the moving mold assembly. Their core-pulling action is primarily driven by a hydraulic cylinder, which extends and retracts to move the core-pulling rod along a preset direction, achieving core pulling and resetting. However, using a hydraulic cylinder as a power source has many inherent drawbacks, severely impacting the economy and efficiency of injection molding production.

[0004] Specifically, when using a hydraulic cylinder as the core-pulling power source, a corresponding cylinder seat must be installed on the mold to fix and install the cylinder. Both the cylinder seat and the cylinder itself have a certain volume and weight, which will increase the overall volume and weight of the mold. Increased mold volume leads to increased installation space required for the mold. Molds that could originally be used with small-tonnage injection molding machines may become unusable due to their excessive size, necessitating the use of large-tonnage injection molding machines for production operations.

[0005] Large-tonnage injection molding machines have significantly higher power and energy consumption than small-tonnage machines. When producing products using small-tonnage molds, most of the power of large-tonnage injection molding machines remains idle, resulting in substantial energy waste. Furthermore, the higher operating and maintenance costs of large-tonnage injection molding machines increase production costs and reduce product market competitiveness. In addition, hydraulic cylinder drives suffer from complex structures, high sealing requirements, and susceptibility to oil leaks, leading to significant maintenance workload and further impacting production efficiency.

[0006] Therefore, the existing core-pulling mechanism driven by the hydraulic cylinder on the moving mold side has technical pain points such as large mold volume, serious energy waste, high production cost and inconvenient maintenance. There is an urgent need for an injection mold core-pulling structure that can solve the above problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an injection mold with a fixed mold core pulling mechanism in view of the current situation of the prior art.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an injection mold with a fixed mold core pulling mechanism is proposed, comprising: a moving mold assembly; A fixed mold assembly is movably fitted with the moving mold assembly to form a product cavity when the moving mold assembly and the fixed mold assembly are closed. The fixed mold assembly includes: a fixed mold frame having a mounting hole at one end communicating with the product cavity; a movable plate movably disposed relative to the fixed mold frame on the side of the fixed mold frame away from the moving mold assembly along a first direction; a core-pulling assembly including: a core-pulling rod movably inserted into the mounting hole along a second direction intersecting the first direction; a push block fixedly disposed at the end of the core-pulling rod away from the product cavity; an elastic element having its two ends abutting against the fixed mold frame and the push block respectively, and applying a pre-set elastic force to the push block to give it a tendency to move in the opposite direction to the second direction; and a driving block fixedly connected to the movable plate and having a transmission surface in contact with the push block, wherein the transmission surface is inclined relative to the first direction.

[0009] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the transmission surface is a set of mutually cooperating inclined surfaces.

[0010] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the fixed mold assembly further includes a limiting seat, which is fixed to the outer side wall of the fixed mold frame. The limiting seat includes a pushing groove located on the moving path of the driving block, and the pushing groove is disposed opposite to the pushing block; wherein... When the moving plate and the fixed mold frame abut against each other, the end of the driving block is located in the pushing groove, and the outer side wall of the driving block and the inner side wall of the pushing groove are mutually abutting inclined surfaces.

[0011] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the fixed mold assembly further includes at least one pull rod, one end of which is fixed to the movable plate, and the other end slidably passes through the fixed mold frame and has a head; the fixed mold frame is provided with an abutment surface that mates with the head; wherein... When the moving mold assembly and the fixed mold assembly are in the mold-closed state, there is a preset gap between the head and the abutting surface.

[0012] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the stroke of the pull rod after the preset gap is eliminated is greater than or equal to the stroke of the core-pulling rod completely withdrawing from the product cavity.

[0013] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the fixed mold assembly further includes a guide mechanism for guiding the movement of the fixed mold frame.

[0014] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the guiding mechanism includes a guide sleeve disposed on the fixed mold frame and a guide post disposed on the movable plate and cooperating with the guide sleeve.

[0015] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the fixed mold frame is provided with a mounting groove communicating with the mounting hole, the elastic element is located in the mounting groove, and the groove wall of the mounting groove provides radial support to the elastic element to prevent the elastic element from bending and deforming under pressure.

[0016] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the elastic element is a helical compression spring.

[0017] In the aforementioned injection mold with a fixed mold core-pulling mechanism, the fixed mold frame is provided with countersunk holes corresponding to the pull rods one by one. The countersunk holes include a large end facing the moving mold assembly and a small end facing the moving plate. The pull rod passes through the countersunk holes and the head of the pull rod is located in the large end of the countersunk holes. The transition surface between the large end and the small end of the countersunk holes forms the abutment surface.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) By integrating the core-pulling mechanism into the fixed mold assembly and adopting a pure mechanical transmission structure consisting of a moving plate, a drive block, a push block, and elastic components, the linear motion of the injection molding machine opening the mold is brought about. Through the contact surface between the drive block and the push block, the force is directly converted into the force that drives the core-pulling rod to move backward, completely replacing the physical change of the traditional hydraulic cylinder drive method. This achieves the elimination of the need for external oil circuits and oil cylinders, greatly simplifying the mold structure, significantly reducing its size and weight, and making it suitable for smaller tonnage injection molding machines, thus reducing equipment investment and energy consumption. It also eliminates the inherent risks of oil leakage and sealing failure in oil cylinder drive, improves the stability and reliability of the core-pulling action, and reduces maintenance costs. The mechanical linkage response is direct and rapid, ensuring precise synchronization between the core-pulling and mold-opening actions, and improving production efficiency and product quality.

[0020] (2) By designing the contact surfaces of the drive block and the push block as mutually cooperating inclined structures, the translational thrust of the drive block is decomposed into a normal force perpendicular to the contact surface and a frictional force along the contact surface. Through the inclined plane effect, the displacement of the drive block is smoothly and continuously transformed into a force change of the displacement of the push block. This achieves a smoother and less impactful thrust transmission process compared to planar contact, effectively avoiding jamming and uneven force distribution. Under the same drive stroke, the transmission ratio can be changed by adjusting the inclined plane angle, realizing the optimized design of the core pulling stroke and speed, ensuring the smoothness and accuracy of the core pulling action.

[0021] (3) A limiting seat is fixed on the outer wall of the fixed mold frame. A pushing groove is set on the limiting seat, which is located on the moving path of the driving block and opposite to the pushing block. When the moving plate abuts against the fixed mold frame, the end of the driving block is located in the pushing groove and the outer walls of the two form an inclined surface cooperation mechanism. The limiting seat can play a precise limiting and guiding role for the movement of the driving block, preventing the driving block from shifting or tilting during the movement of the moving plate, ensuring that the driving block can always make precise contact with the pushing block and stably transmit the thrust. At the same time, the inclined surface cooperation mechanism between the pushing groove and the driving block can further optimize the thrust transmission effect, making the movement of the driving block more stable, reducing the wear between the driving block and the limiting seat, extending the service life of the parts, thereby improving the operation stability and durability of the entire core pulling mechanism, ensuring the accuracy and consistency of the core pulling action, and ensuring the stability of the product molding quality. Attached Figure Description

[0022] Figure 1 This is a perspective view of an injection mold with a fixed mold core-pulling mechanism according to the present invention.

[0023] Figure 2 yes Figure 1 Top view.

[0024] Figure 3 yes Figure 2 Sectional view at point AA.

[0025] Figure 4 yes Figure 3 A magnified view of a section at point C.

[0026] Figure 5 yes Figure 2 Sectional view at point BB.

[0027] Figure 6 yes Figure 5 A magnified view of a section at point D.

[0028] Figure 7 This is a 3D view of the fixed mold assembly.

[0029] Figure 8 yes Figure 7 A 3D view with some structural elements omitted.

[0030] Figure 9 It is a 3D diagram of the limit seat.

[0031] In the diagram, 100 is the moving mold assembly; 200 is the fixed mold assembly; 210 is the fixed mold frame; 211 is the mounting hole; 212 is the mounting groove; 213 is the guide sleeve; 214 is the countersunk hole; 214a is the large end; 214b is the small end; 214c is the abutment surface; 220 is the moving plate; 221 is the guide post; 230 is the core-pulling assembly; 231 is the core-pulling rod; 232 is the push block; 233 is the elastic element; 234 is the drive block; 240 is the limit seat; 241 is the push groove; 250 is the pull rod; 251 is the head; 260 is the preset gap; and 300 is the product cavity. Detailed Implementation

[0032] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] like Figures 1 to 9 As shown, an injection mold with a fixed mold core-pulling mechanism is disclosed. The mold includes a moving mold assembly 100 and a fixed mold assembly 200. The fixed mold assembly 200 is fixed on the injection molding machine and does not move. The moving mold assembly 100 is movably engaged with the fixed mold assembly 200. The mold closing and opening of the injection mold are realized by the forward and backward movement of the moving mold assembly 100, respectively.

[0035] The fixed mold assembly 200 is movably coupled with the moving mold assembly 100. When the moving mold assembly 100 and the fixed mold assembly 200 are closed, a product cavity 300 is formed between them. This cavity is used for injection molding of products with complex structures such as side holes and side grooves. It eliminates the need for additional hydraulic cylinders to drive core pulling, effectively solving the pain points of large mold volume and energy waste in the prior art.

[0036] Specifically, the fixed mold assembly 200 includes a fixed mold frame 210, a moving plate 220, and a core-pulling assembly 230. The three work together to realize the core-pulling action on the fixed mold side. It does not require a hydraulic cylinder as a power source, has a compact structure, occupies little space, and can be adapted to small-tonnage injection molding machines, reducing energy consumption and production costs.

[0037] The movable plate 220 is movably disposed relative to the fixed mold frame 210 along a first direction (the movable plate 220 does not move during actual movement, but the fixed mold frame 210 moves). It is located on the side of the fixed mold frame 210 away from the moving mold assembly 100. The first direction is the mold closing and opening direction of the injection mold, that is, the linear movement direction of the moving mold assembly relative to the fixed mold assembly in the mold opening and closing motion. As the starting component for power transmission of the core pulling action, in this embodiment, the relative power of the movable plate 220 comes from the linkage power of the injection molding machine's mold opening and closing. There is no need to set up an additional drive cylinder, which simplifies the structure and reduces maintenance costs.

[0038] The fixed mold frame 210 is provided with a mounting hole 211 at one end that is connected to the product cavity 300, providing a channel for the core-pulling rod 231 to be installed and moved, ensuring that the core-pulling rod 231 can accurately correspond to the side structure of the product cavity 300, and avoiding defects such as tearing and deformation after the product is formed.

[0039] The core-pulling assembly 230 includes a core-pulling rod 231, a pushing block 232, an elastic element 233, and a driving block 234, and is the core execution component for realizing the core-pulling action.

[0040] The core-pulling rod 231 is movably inserted into the mounting hole 211 along a second direction intersecting the first direction. The second direction is the core-pulling and resetting direction of the core-pulling rod, which is usually a lateral linear movement direction perpendicular to the first direction. The end of the core-pulling rod close to the product cavity 300 is adapted to the side structure of the product and is used to form the side holes, side grooves and other structures of the product. After the forming is completed, it can move along the mounting hole 211 and completely withdraw from the product cavity 300 to realize the core-pulling action.

[0041] The push block 232 is fixed to one end of the core-pulling rod 231 away from the product cavity 300. It is a roughly wedge-shaped block structure. The side of the core-pulling rod facing the drive block 234 is machined with an inclined thrust surface that is consistent with it. The side of the core-pulling rod away from the drive block is a flat surface for abutting the elastic element 233. The core-pulling rod 231 has a threaded blind hole or through hole for connecting with it.

[0042] The push block 232 is fixed by threading its internal threaded hole to the end of the core-pulling rod 231, forming a detachable rigid connection; in other embodiments, the push block can also be axially positioned by setting a step at the end of the core-pulling rod, and circumferentially fixed by a snap ring or pin.

[0043] The push block 232 moves synchronously with the core-pulling rod 231 to receive the thrust transmitted by the drive block 234 and transmit the thrust to the core-pulling rod 231. At the same time, it cooperates with the elastic element 233 to reset the core-pulling rod 231, ensuring that the core-pulling rod 231 can quickly return to its initial position after the core-pulling action is completed, in preparation for the next injection molding.

[0044] The two ends of the elastic element 233 abut against the fixed mold frame 210 and the push block 232 respectively, and apply a pre-set elastic force to the push block 232 to make it move in the opposite direction to the second direction. This pre-set elastic force provides power for the core-pulling rod 231 to reset, eliminating the need for an additional reset cylinder, further simplifying the structure and reducing energy consumption.

[0045] The fixed mold frame 210 is provided with a mounting groove 212 communicating with the mounting hole 211. The elastic element 233 is located within the mounting groove 212, and the groove wall of the mounting groove 212 provides radial support to the elastic element 233 to prevent the elastic element 233 from bending and deforming under pressure. The mounting groove 212 can limit and protect the elastic element 233, ensuring the service life and working stability of the elastic element 233, while making the overall structure more compact. The elastic element 233 is preferably a helical compression spring.

[0046] In this design, the push block 232 is also movably disposed in the mounting groove 212. The outer side wall of the push block 232 and the inner side wall of the mounting groove 212 move against each other. When the push block 232 moves, the mounting groove 212 provides guidance for the push block 232 and also provides guidance for the core-pulling rod 231.

[0047] The drive block 234 is fixed to the moving plate 220 and has a transmission surface that contacts the push block 232. The transmission surface is inclined relative to the first direction and is a mutually cooperating inclined surface. The drive block 234 is generally elongated, with the side near the push block 232 being an inclined surface that matches the push block, and the side away from the push block being a vertical plane or a guide inclined surface that cooperates with the limiting seat.

[0048] The drive block 234 moves synchronously with the moving plate 220 (in actual movement, the drive block 234 does not move, but the fixed mold frame 210 drives the push block 232 to move toward the drive block 234). The transmission surface forms a thrust transmission path, which is used to convert the movement of the moving plate 220 along the first direction into a thrust on the push block 232 along the second direction, and the direction of the thrust is opposite to the direction of the preset elastic force of the elastic member 233.

[0049] When the movable plate 220 moves (in actual movement, the movable plate 220 does not move, but the fixed mold frame 210 moves), the drive block 234 pushes the push block 232 through the transmission surface to overcome the pre-set elastic force of the elastic element 233, and drives the core-pulling rod 231 to move towards the product cavity 300, thereby realizing the reset action of the core-pulling rod.

[0050] When the moving plate 220 moves in the opposite direction (in actual movement, the moving plate 220 does not move, but the fixed mold frame 210 moves), the pushing force of the driving block 234 on the pushing block 232 disappears, and the pre-set elastic force of the elastic element 233 pushes the pushing block 232 and the core-pulling rod 231 to reset, disengage from the product cavity 300, and realize the core-pulling action.

[0051] The inclined plane can smoothly transform the linear motion of the moving plate 220 into the linear motion of the pushing block 232, making the transmission of thrust more uniform and stable, avoiding jamming, and increasing the efficiency of thrust transmission to ensure the smoothness of the core pulling action.

[0052] Furthermore, the fixed mold assembly 200 also includes a limiting seat 240, which is fixed to the outer side wall of the fixed mold frame 210.

[0053] In one embodiment, the limiting seat 240 is fixed to the outer wall of the fixed mold frame 210 by bolts (not shown), and the central axis of the push groove 241 on it is parallel to the axis of the core-pulling rod 231, ensuring that the movement direction of the drive block 234 corresponds precisely to the core-pulling direction.

[0054] The limiting seat 240 includes a pushing groove 241 located on the moving path of the driving block 234, and the pushing groove 241 is disposed opposite to the pushing block 232.

[0055] When the moving plate 220 and the fixed mold frame abut against each other, the end of the driving block 234 is located in the pushing groove 241, and the outer side wall of the driving block 234 and the inner side wall of the pushing groove 241 are mutually abutting inclined surfaces.

[0056] The limit seat 240 can limit and guide the movement of the drive block 234, preventing the drive block 234 from deviating during movement and ensuring that the drive block 234 can accurately contact the push block 232 and transmit the thrust. At the same time, the inclined surface can further optimize the thrust transmission effect, making the movement of the drive block 234 more stable and further improving the stability and reliability of the core pulling action.

[0057] Furthermore, the fixed mold assembly 200 also includes at least one pull rod 250, one end of which is fixed to the moving plate 220, and the other end is slidably passed through the fixed mold frame 210 and has a head 251; the fixed mold frame 210 is provided with an abutment surface 214c that cooperates with the head 251.

[0058] The fixed mold frame 210 is provided with countersunk holes 214 corresponding to the tie rods 250. The countersunk holes 214 include a large end 214a facing the moving mold assembly 100 and a small end 214b facing the moving plate 220. The tie rods 250 pass through the countersunk holes 214 and the head 251 of the tie rods 250 is located in the large end 214a of the countersunk holes 214. The transition surface between the large end 214a and the small end 214b of the countersunk holes 214 forms the abutment surface 214c.

[0059] When the moving mold assembly 100 and the fixed mold assembly 200 are in the mold-closed state, there is a preset gap 260 between the head 251 and the abutment surface 214c.

[0060] The tie rod 250 can limit the movement of the movable plate 220, preventing excessive movement of the movable plate 220 from damaging the core-pulling rod 231 or deforming the product; the preset gap 260 can provide space for the initial movement of the movable plate 220, ensuring that the core-pulling rod 231 can be stably placed in the product cavity 300 in the mold closing state, thus ensuring the product molding quality.

[0061] Meanwhile, the stroke of the pull rod 250 after the preset gap 260 is eliminated is greater than or equal to the stroke of the core-pulling rod 231 when it is completely withdrawn from the product cavity 300. This setting can ensure that the core-pulling rod 231 can be completely withdrawn from the product cavity 300, avoiding product damage and deformation caused by incomplete core pulling, and further improving the product molding quality.

[0062] The countersunk hole 214 can limit and guide the tie rod 250, preventing the tie rod 250 from deviating during sliding. At the same time, it allows the head 251 of the tie rod 250 to be hidden in the countersunk hole 214, making the overall structure more compact, reducing the overall volume of the mold, and further adapting to small-tonnage injection molding machines.

[0063] Furthermore, the fixed mold assembly 200 also includes a guide mechanism for guiding the movement of the fixed mold frame 210. The guide mechanism can ensure that the fixed mold frame 210 moves smoothly along a preset direction, avoid the fixed mold frame 210 from shifting or tilting, ensure that the drive block 234 can accurately contact the push block 232, and ensure the smoothness and stability of the core pulling action.

[0064] The guiding mechanism includes a guide sleeve 213 disposed on the fixed mold frame 210 and a guide post 221 disposed on the movable plate 220 and cooperating with the guide sleeve 213. The cooperation structure between the guide post 221 and the guide sleeve 213 is simple, provides precise guidance, and has low wear. It can stably guide the movable plate 220 for a long time, and is easy to install and maintain, further improving the service life and working stability of the mold.

[0065] In actual use, when the injection mold is closed, the moving mold assembly 100 and the fixed mold assembly 200 fit together, forming a product cavity 300. At this time, there is a preset gap 260 between the head 251 of the pull rod 250 and the abutting surface 214c of the countersunk hole 214. Under the pre-set elastic force of the elastic element 233, the end of the core-pulling rod 231 extends into the product cavity 300 and matches the side structure of the product cavity 300 to prepare for product molding. The injection molding machine injects molten raw material into the product cavity 300. After the raw material cools and solidifies, the core-pulling action begins.

[0066] During core pulling, the external driving force (the injection molding machine's mold opening and closing linkage power) drives the moving plate 220 to move away from the moving mold assembly 100 along the first direction (this is a relative motion description; in reality, the moving mold assembly moves while the fixed mold assembly remains stationary). The moving plate 220 drives the driving block 234 to move synchronously. The driving block 234 applies a thrust to the pushing block 232 through the inclined transmission surface that cooperates with the pushing block 232, which is opposite to the direction of the pre-set elastic force of the elastic element 233. This overcomes the pre-set elastic force of the elastic element 233 and pushes the pushing block 232 and the core pulling rod 231 to move away from the product cavity 300 along the second direction.

[0067] At the same time, the moving plate 220 drives the pull rod 250 to move synchronously. The head 251 of the pull rod 250 gradually approaches the abutting surface 214c of the countersunk hole 214. When the head 251 contacts the abutting surface 214c, the preset gap 260 is eliminated, and the pull rod 250 continues to move. Its movement ensures that the core-pulling rod 231 can be completely withdrawn from the product cavity 300, completing the core-pulling action.

[0068] During this process, the guide post 221 of the guide mechanism cooperates with the guide sleeve 213 to guide the moving plate 220 to move smoothly, and the push groove 241 of the limit seat 240 plays a limiting and guiding role on the drive block 234 to ensure that the core pulling action is smooth and accurate.

[0069] After the core is pulled out, the external driving force drives the moving plate 220 to move in the opposite direction to the moving mold assembly 100 along the first direction. The driving block 234 moves synchronously with the moving plate 220, and the pushing force on the pushing block 232 gradually disappears. At this time, the pre-set elastic force of the elastic element 233 pushes the pushing block 232 and the core pulling rod 231 to move towards the product cavity 300 until the core pulling rod 231 returns to its initial position. At the same time, the pull rod 250 moves synchronously with the moving plate 220, and the head 251 and the abutment surface 214c re-form the preset gap 260. The mold is reset and ready for the next injection molding.

[0070] In this embodiment, by setting the core-pulling mechanism on the fixed mold assembly 200, the mechanical cooperation of the moving plate 220, the driving block 234, and the pushing block 232 is used to transmit the thrust, and the core pulling and resetting are realized in combination with the elastic element 233. There is no need for a hydraulic cylinder as a power source, which effectively solves the pain points of large mold volume, energy waste, and inconvenient maintenance caused by hydraulic cylinder drive in the prior art. At the same time, through the transmission surface, the limit seat 240, the pull rod 250, the guide mechanism and other structures, the stability, accuracy and compactness of the core-pulling mechanism are further optimized, ensuring the product molding quality, reducing production costs and energy consumption, and enhancing the market competitiveness of the product.

[0071] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0073] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An injection mold with a fixed mold core-pulling mechanism, characterized in that, include: Dynamic model components; A fixed mold assembly is movably fitted with the moving mold assembly to form a product cavity when the moving mold assembly and the fixed mold assembly are closed. The fixed mold assembly includes: a fixed mold frame having a mounting hole at one end communicating with the product cavity; a movable plate movably disposed relative to the fixed mold frame on the side of the fixed mold frame away from the moving mold assembly along a first direction; a core-pulling assembly including: a core-pulling rod movably inserted into the mounting hole along a second direction intersecting the first direction; a push block fixedly disposed at the end of the core-pulling rod away from the product cavity; an elastic element having its two ends abutting against the fixed mold frame and the push block respectively, and applying a pre-set elastic force to the push block to give it a tendency to move in the opposite direction to the second direction; and a driving block fixedly connected to the movable plate and having a transmission surface in contact with the push block, wherein the transmission surface is inclined relative to the first direction.

2. The injection mold with a fixed mold core-pulling mechanism as described in claim 1, characterized in that, The transmission surfaces are mutually cooperating inclined surfaces.

3. The injection mold with a fixed mold core-pulling mechanism as described in claim 1, characterized in that, The fixed mold assembly further includes a limiting seat, which is fixed to the outer side wall of the fixed mold frame. The limiting seat includes a pushing groove located on the moving path of the driving block, and the pushing groove is disposed opposite to the pushing block. When the moving plate and the fixed mold frame abut against each other, the end of the driving block is located in the pushing groove, and the outer side wall of the driving block and the inner side wall of the pushing groove are mutually abutting inclined surfaces.

4. An injection mold with a fixed mold core-pulling mechanism as described in claim 1, characterized in that, The fixed mold assembly further includes at least one pull rod, one end of which is fixed to the movable plate, and the other end of which slidably passes through the fixed mold frame and has a head; the fixed mold frame is provided with an abutment surface that mates with the head; wherein... When the moving mold assembly and the fixed mold assembly are in the mold-closed state, there is a preset gap between the head and the abutting surface.

5. An injection mold with a fixed mold core-pulling mechanism as described in claim 4, characterized in that, The stroke of the pull rod after the preset gap is eliminated is greater than or equal to the stroke of the core-pulling rod when it is completely withdrawn from the product cavity.

6. An injection mold with a fixed mold core-pulling mechanism as described in claim 1, characterized in that, The fixed mold assembly also includes a guide mechanism for guiding the movement of the fixed mold frame.

7. An injection mold with a fixed mold core-pulling mechanism as described in claim 6, characterized in that, The guiding mechanism includes a guide sleeve disposed on the fixed mold frame and a guide post disposed on the movable plate that cooperates with the guide sleeve.

8. An injection mold with a fixed mold core-pulling mechanism as described in claim 1, characterized in that, The fixed mold frame is provided with a mounting groove communicating with the mounting hole. The elastic element is located in the mounting groove, and the groove wall of the mounting groove provides radial support to the elastic element to prevent the elastic element from bending and deforming under pressure.

9. An injection mold with a fixed mold core-pulling mechanism as described in claim 1, characterized in that, The elastic element is a helical compression spring.

10. An injection mold with a fixed mold core-pulling mechanism as described in claim 4, characterized in that, The fixed mold frame is provided with countersunk holes corresponding to the tie rods. The countersunk holes include a large end facing the moving mold assembly and a small end facing the moving plate. The tie rods pass through the countersunk holes and the head of the tie rods is located in the large end of the countersunk holes. The transition surface between the large end and the small end of the countersunk holes forms the abutment surface.

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