A long-stroke core-pulling mechanism derived from the worm gear core-pulling design.

Abstract

This utility model discloses a long-stroke core-pulling mechanism extending from a worm gear core-pulling design. It includes an upper mold mechanism, a lower mold mechanism, a slider seat, a slider seat guide strip, a core-pulling insert, a helical rack, and a helical rack guide insert. The slider seat is slidably connected to one side of the injection lower mold via the slider seat guide strip. Two helical racks are provided, with their tops fixedly connected to the bottom of the upper mold seat. Two helical rack guide inserts are provided, each fixed to one side of a different channel. The guide slots of the corresponding helical rack guide inserts for each helical rack slide together. Several helical tooth blocks mesh with the teeth of the two helical racks on both sides of the slider seat. The core-pulling insert is fixedly connected to the front end of the slider seat. This utility model achieves core-pulling action and mold opening simultaneously through the meshing transmission between the helical tooth blocks on the side walls of the slider seat and the two helical racks fixed to the upper mold mechanism. This enables long-distance core pulling within a limited space without increasing mold thickness, resulting in high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of core pulling technology for injection molds, and more specifically, to a large-stroke core pulling mechanism derived from a worm gear core pulling mechanism. Background Technology

[0002] As plastic products become increasingly complex, injection molds, the tools used to produce them, inject molten material under high pressure into the mold cavity. After cooling and solidification, the molded product is obtained. However, when faced with the need for long-distance core pulling, conventional inclined guide post core pulling structures rely on mold opening force. To meet the long core pulling distance, the length of the inclined guide posts needs to be significantly increased, leading to an increase in the overall thickness of the mold. This makes it difficult to meet the requirements for long distances or high precision, necessitating the use of larger molding machines and increasing equipment costs. Although hydraulic cylinder core pulling structures can achieve long strokes, the core pulling and resetting processes are time-consuming, significantly extending the product production cycle and reducing production efficiency. Therefore, there is an urgent need for a large-stroke mechanism based on the worm gear core pulling principle, which can balance space occupation, motion accuracy, and molding speed to meet the high-efficiency production needs of complex products. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a large-stroke core-pulling mechanism that is an extension of the worm gear core-pulling form, which can achieve efficient, stable, and long-distance core pulling within a limited space.

[0004] To achieve the above objectives, this utility model provides a large-stroke core-pulling mechanism extending from a worm gear core-pulling design, including an upper mold mechanism, a lower mold mechanism, a slider seat, a slider seat guide strip, a core-pulling insert, a helical rack, and a helical rack guide insert. The upper mold mechanism includes an upper mold base and an injection upper mold embedded at the bottom of the upper mold base. The lower mold mechanism includes a lower mold base and an injection lower mold embedded at the top of the lower mold base. The injection lower mold and the injection upper mold form a molding cavity when the mold is closed. The slider seat guide strip is fixedly connected to one side of the top of the lower mold base, and the slider seat is slidably connected via the slider seat guide strip. The lower mold base is attached to one side of the injection mold. Two oblique racks are provided and are vertically arranged on both sides of the slider base, with their tops fixedly connected to the bottom of the upper mold base. The lower mold base has a channel for the two oblique racks to pass through. Two oblique rack guide inserts are provided and are fixed on one side of the two channels of the lower mold base. The guide slots of the oblique rack guide inserts corresponding to each oblique rack slide in fit. Several oblique tooth blocks that mesh with the teeth of the two oblique racks are provided on the two side walls of the slider base. The core-pulling insert is fixedly connected to the front end of the slider base and extends into the molding cavity.

[0005] Preferably, the assembly also includes a shovel base, the top of which is fixedly connected to the bottom surface of the upper mold base, the rear end face of the slider base is configured as a first inclined surface, the front end face of the shovel base is configured as a second inclined surface adapted to the first inclined surface, and the second inclined surface of the shovel base abuts against the first inclined surface of the slider base.

[0006] Preferably, the top surface of the slider guide bar is horizontally provided with an abutment groove for the bottom end of the shovel base to be inserted.

[0007] Preferably, the longitudinal section of the slider seat guide bar is T-shaped, and the bottom surface of the slider seat is provided with a sliding groove that matches the shape of the slider seat guide bar. The slider seat slides with the slider seat guide bar through the sliding groove to achieve a sliding connection.

[0008] Preferably, it also includes two water connectors. The slider seat has two horizontal through holes, and the tail end of the core-pulling insert has a connector socket for the water connectors to be inserted. The two water connectors pass through the two through holes and are then inserted into their respective connector sockets.

[0009] Preferably, a support plate is also included, which is fixedly connected to the outer wall of the lower mold base and located on one side of the slider base. The portion of the slider base guide strip extending out of the lower mold base is fixedly connected to the top surface of the support plate. A limiting bolt is fixedly provided at the end of the top surface of the support plate, and a limiting notch that can abut against the limiting bolt is provided at the end of the bottom surface of the slider base.

[0010] Preferably, the upper mold mechanism further includes an upper mold top plate, upper mold guide pillars, and a first flow channel. The upper mold top plate is disposed on the top of the upper mold base, and the upper mold top plate is provided with a pouring nozzle extending from its bottom surface. The upper mold guide pillars are provided with four pillars and are respectively vertically disposed at the four corners of the upper mold base. The side of the upper mold base is provided with a plurality of first inlets and first outlets for condensate to flow in and out. The first inlets and first outlets are respectively connected to the upper mold base and the first flow channel inside the injection mold.

[0011] Preferably, the lower mold mechanism further includes a lower mold base plate, an ejector base plate, an ejector panel, square iron blocks, and limiting posts. Two square iron blocks are provided and are installed at intervals between the top of the lower mold base plate and the bottom of the lower mold plate. The ejector panel is provided on the ejector base plate and is located between the two square iron blocks. The ejector panel has several ejector holes. The limiting posts are fixedly connected to the lower mold base plate and extend upward through the ejector base plate and the ejector panel into the bottom of the lower mold base. The four corners of the lower mold base are respectively provided with lower mold guide holes for the upper mold guide posts to be inserted.

[0012] Preferably, the lower mold mechanism further includes a second flow channel, and the side of the lower mold base is provided with a plurality of second inlets and second outlets for condensate to flow in and out, the second inlets and second outlets being connected to the lower mold base and the second flow channel inside the injection mold, respectively.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model has a simple structure and reasonable design. Through the meshing transmission of the inclined tooth blocks on both sides of the sliding seat and the two inclined toothed racks fixed on the upper mold mechanism, the core pulling action and mold opening are completed synchronously. It can achieve long-distance core pulling in a limited space without increasing the mold thickness. Compared with hydraulic cylinder core pulling, it reduces the time of separate hydraulic control. Its structure is compact, safe and reliable, and stable in operation, which can effectively shorten the production cycle and improve production efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the large-stroke core-pulling mechanism, which is an extension of the worm gear core-pulling mechanism, provided in this embodiment of the utility model.

[0017] Figure 2 This is an exploded view of a large-stroke core-pulling mechanism derived from a worm gear core-pulling mechanism provided in this embodiment of the invention. Figure 1 ;

[0018] Figure 3 This is an exploded view of a large-stroke core-pulling mechanism derived from a worm gear core-pulling mechanism provided in this embodiment of the invention. Figure 2 ;

[0019] Figure 4 This is a partial structural schematic diagram of a large-stroke core-pulling mechanism extending from a worm gear core-pulling form provided in an embodiment of this utility model;

[0020] Figure 5 This is a partially exploded schematic diagram of a large-stroke core-pulling mechanism extending from a worm gear core-pulling form provided in an embodiment of this utility model;

[0021] Figure 6 This is a partial cross-sectional schematic diagram of a large-stroke core-pulling mechanism extending from a worm gear core-pulling form provided in an embodiment of this utility model;

[0022] Figure 7This is a schematic diagram of the core-pulling state of a large-stroke core-pulling mechanism derived from a worm gear core-pulling mechanism provided in an embodiment of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Please refer to Figure 1 The present invention provides a large-stroke core-pulling mechanism extending from a worm gear core-pulling form, including an upper mold mechanism 1, a lower mold mechanism 2, a slider seat 3, a slider seat guide strip 31, a core-pulling insert 4, a helical rack 5, a helical rack guide insert 51, and other components. The components of this embodiment will be described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, the upper mold mechanism 1 may be provided with an upper mold base 11 and an injection upper mold 12 embedded at the bottom of the upper mold base 11. The lower mold mechanism 2 is provided with a lower mold base 21 and an injection lower mold 22 embedded at the top of the lower mold base 21. The injection lower mold 22 and the injection upper mold 12 form a molding cavity when the mold is closed.

[0026] Specifically, the slider seat guide bar 31 can be fixedly connected to the top side of the lower mold seat 21. The slider seat 3 is slidably connected to one side of the injection mold 22 through the slider seat guide bar 31. Two oblique racks 5 are provided and are respectively vertically arranged on both sides of the slider seat 3, and their tops are fixedly connected to the bottom of the upper mold seat 11. The lower mold seat 21 is provided with a channel for the two oblique racks 5 to move through. Two oblique rack guide inserts 51 are provided and are respectively fixed on one side of the two channels of the lower mold seat 21. The guide opening slots 510 of the oblique rack guide inserts 51 corresponding to each oblique rack 5 are slidably engaged. Several oblique tooth blocks 30 that mesh with the tooth positions of the two oblique racks 5 are provided on the two side walls of the slider seat 3. The core-pulling insert 4 is fixedly connected to the front end of the slider seat 3 and extends into the molding cavity.

[0027] Among them, the side cross-sectional shape of the slider seat 3 can be set as a right trapezoid. The slider seat 3 achieves stable linear sliding through the slider seat guide strip 31, which enables the core-pulling insert 4 to complete the core-pulling and resetting actions. The helical rack 5 is provided with two racks that rise with the upper mold mechanism 1 when the mold is opened, which transforms the vertical motion of the mold opening into horizontal core pulling, eliminating the need for hydraulic cylinders and shortening the cycle. The double helical rack 5 is symmetrically designed, with balanced force and more stable movement, and can achieve long-distance core pulling.

[0028] Preferably, it may also include a support plate 52, which is fixedly connected to the outer wall of the lower mold base 21 and located on one side of the slider base 3. The part of the slider base guide strip 31 extending out of the lower mold base 21 is fixedly connected to the top surface of the support plate 52. A limiting bolt 53 is fixedly provided at the end of the top surface of the support plate 52, and a limiting notch 35 that can abut against the limiting bolt 53 is provided at the end of the bottom surface of the slider base 3.

[0029] Among them, the support plate 52 is used to fix the extended end of the slider seat guide bar 31 and enhance rigidity, and the limiting bolt 53 can limit the core pulling stroke of the slider seat 3 and prevent the slider seat 3 from slipping.

[0030] like Figure 4 As shown, it may also include a shovel base 6, the top of which is fixedly connected to the bottom surface of the upper mold base 11, the rear end surface of the slider base 3 is set as a first inclined surface 32, the front end surface of the shovel base 6 is set as a second inclined surface 61 that is adapted to the first inclined surface 32, and the second inclined surface 61 of the shovel base 6 abuts against the first inclined surface 32 of the slider base 3.

[0031] like Figure 5 As shown, the top surface of the slider guide bar 31 can be horizontally provided with an abutment groove 311 for the bottom end of the shovel base 6 to be inserted.

[0032] When the shovel base 6 is closed, the second inclined surface 61 presses against the first inclined surface 32 of the slider seat 3 to ensure that the core-pulling insert 4 is in the molding position, resist the injection pressure, and prevent the slider seat 3 from moving backward. The abutting groove 311 of the slider seat guide strip 31 enhances the locking stability.

[0033] Furthermore, the longitudinal section of the slider seat guide bar 31 is T-shaped, and the bottom surface of the slider seat 3 is provided with a sliding groove 33 that matches the shape of the slider seat guide bar 31. The slider seat 3 slides with the slider seat guide bar 31 through the sliding groove 33 to achieve a sliding connection.

[0034] like Figure 6 As shown, it may also include two water connectors 7. Two through holes 34 are horizontally opened on the slider seat 3. The tail end of the core insert 4 is provided with a connector socket 41 for the water connectors 7 to be inserted. The two water connectors 7 pass through the two through holes 34 respectively and are inserted into their respective connector sockets 41.

[0035] Among them, the water channel connector 7 can be connected to the connector socket 41 of the core-pulling insert 4 to form a cooling channel, accelerate local cooling, and shorten the molding cycle.

[0036] In this embodiment, the upper mold mechanism 1 may further include an upper mold top plate 13, an upper mold guide post 14, and a first flow channel 121. The upper mold top plate 13 is disposed on the top of the upper mold base 11. The upper mold top plate 13 is provided with a pouring nozzle 16 extending from its bottom surface. The upper mold guide post 14 is provided with four posts and is respectively vertically disposed at the four corners of the upper mold base 11. The side of the upper mold base 11 is provided with a plurality of first inlets 112 and first outlets 113 for condensate to flow in and out. The first inlets 112 and first outlets 113 are respectively connected to the upper mold base 11 and the first flow channel 121 inside the injection upper mold 12.

[0037] Furthermore, the lower mold mechanism 2 also includes a lower mold base plate 23, an ejector base plate 24, an ejector panel 25, square iron 26, and a limiting post 27. Two square irons 26 are provided and are installed at intervals between the top of the lower mold base plate 23 and the bottom of the lower mold plate. The ejector panel 25 is provided on the ejector base plate 24 and is located between the two square irons 26. Several ejector holes are opened on the ejector panel 25. The limiting post 27 is fixedly connected to the lower mold base plate 23 and extends upward through the ejector base plate 24 and the ejector panel 25 and then into the bottom of the lower mold base 21. The four corners of the lower mold base 21 are respectively provided with lower mold guide holes 211 for the upper mold guide post 14 to be inserted.

[0038] Specifically, the lower mold mechanism 2 also includes a second flow channel 221. The side of the lower mold base 21 is provided with a number of second inlets 212 and second outlets 213 for condensate to flow in and out. The second inlets 212 and the second outlets 213 are respectively connected to the second flow channel 221 inside the lower mold base 21 and the injection lower mold 22.

[0039] The working principle of this embodiment is as follows:

[0040] like Figure 7 As shown, during mold closing, the upper injection mold 12 of the upper mold mechanism 1 and the lower injection mold 22 of the lower mold mechanism 2 close to form a molding cavity. The second inclined surface 61 of the shovel base 6 pushes the slider seat 3 to reset along the slider seat guide strip 31, so that the core insert 4 extends into the molding cavity. The inclined toothed rack 5 engages and locks with the inclined toothed blocks 30 on both sides of the slider seat 3. Then, the molten plastic is injected into the molding cavity through the pouring nozzle 16 and cooled and solidified by temperature control through the first flow channel 121 and the second flow channel 221.

[0041] When the mold is opened, the upper mold base 11 of the upper mold mechanism 1 drives the two helical racks 5 fixed thereon to rise. Through the meshing transmission between the helical racks 5 and the helical racks 30 of the slider base 3, the vertical mold opening motion is converted into the horizontal core pulling motion of the slider base 3, so that the core pulling insert 4 is removed from the product 10. At the same time, the limiting bolt 53 on the support plate 52 cooperates with the limiting notch 35 at the bottom of the slider base 3 to achieve stroke control.

[0042] After the product is ejected, the upper mold mechanism 1 and the lower mold mechanism 2 close the mold, the helical rack 5 reverses the drive of the slider seat 3 to reset, and the shovel base 6 abuts against the slider seat 3 again to ensure that the core-pulling insert 4 returns to its position, and enters the next injection cycle.

[0043] In summary, this utility model achieves core pulling and mold opening simultaneously through the meshing transmission of the helical tooth blocks on both sides of the sliding seat and the two helical racks fixed to the upper mold mechanism. It can realize long-distance core pulling in a limited space without increasing the mold thickness. Compared with hydraulic cylinder core pulling, it reduces the time of separate hydraulic control. Its structure is compact, safe and reliable, and stable in operation, which can effectively shorten the production cycle and improve production efficiency.

[0044] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling, characterized by: The system includes an upper mold mechanism, a lower mold mechanism, a slider seat, a slider seat guide strip, a core-pulling insert, a helical rack, and a helical rack guide insert. The upper mold mechanism contains an upper mold base and an injection upper mold embedded at the bottom of the upper mold base. The lower mold mechanism contains a lower mold base and an injection lower mold embedded at the top of the lower mold base. The injection lower mold and the injection upper mold form a molding cavity when the mold is closed. The slider seat guide strip is fixedly connected to one side of the top of the lower mold base, and the slider seat is slidably connected to one side of the injection lower mold via the slider seat guide strip. The helical rack has two... The two oblique racks are vertically mounted on both sides of the slider seat and their tops are fixedly connected to the bottom of the upper mold seat. The lower mold seat has a channel for the two oblique racks to move through. Two oblique rack guide inserts are provided and fixed on one side of the two channels of the lower mold seat respectively. The guide slots of the oblique rack guide inserts corresponding to the oblique racks are slidably engaged. Several oblique tooth blocks that mesh with the teeth of the two oblique racks are provided on the two side walls of the slider seat. The core-pulling insert is fixedly connected to the front end of the slider seat and extends into the forming mold cavity.

2. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling according to claim 1, characterized in that: It also includes a shovel base, the top of which is fixedly connected to the bottom surface of the upper mold base. The rear end surface of the slider base is set as a first inclined surface, and the front end surface of the shovel base is set as a second inclined surface adapted to the first inclined surface. The second inclined surface of the shovel base abuts against the first inclined surface of the slider base.

3. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling according to claim 2, characterized in that: The top surface of the slider guide bar is horizontally provided with an abutment groove for the bottom end of the shovel base to be inserted.

4. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling according to claim 1, characterized in that: The longitudinal section of the slider seat guide bar is T-shaped, and the bottom surface of the slider seat is provided with a sliding groove that matches the shape of the slider seat guide bar. The slider seat slides and engages with the slider seat guide bar through the sliding groove to achieve a sliding connection.

5. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling according to claim 1, characterized in that: It also includes two water connectors. The slider seat has two horizontal through holes. The tail end of the core-pulling insert has a connector socket for the water connectors to be inserted. The two water connectors pass through the two through holes and are then inserted into their respective connector sockets.

6. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling according to claim 1, characterized in that: It also includes a support plate, which is fixedly connected to the outer wall of the lower mold base and located on one side of the slider base. The part of the slider base guide strip extending out of the lower mold base is fixedly connected to the top surface of the support plate. A limiting bolt is fixedly provided at the end of the top surface of the support plate, and a limiting notch that can abut against the limiting bolt is provided at the end of the bottom surface of the slider base.

7. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling according to claim 1, characterized in that: The upper mold mechanism also includes an upper mold top plate, upper mold guide pillars, and a first flow channel. The upper mold top plate is located on the top of the upper mold base. The upper mold top plate is provided with a pouring nozzle extending from its bottom surface. The upper mold guide pillars are provided with four pillars and are vertically arranged at the four corners of the upper mold base. The side of the upper mold base is provided with several first inlets and first outlets for condensate to flow in and out. The first inlets and first outlets are respectively connected to the upper mold base and the first flow channel inside the injection mold.

8. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling according to claim 7, characterized in that: The lower mold mechanism further comprises a lower mold base plate, a ejector pin base plate, an ejector pin panel, square irons, and limiting columns.

9. A large-stroke core-pulling mechanism extended in the form of a worm core-pulling according to claim 8, characterized in that: The lower mold mechanism further comprises a second flow channel, and the side surface of the lower mold base plate is provided with a plurality of second water inlets and second water outlets for the flow of condensed liquid. The side surface of the lower mold base plate is provided with a plurality of second water inlets and second water outlets for the flow of condensed liquid.

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