A multi-stage linkage demoulding mechanism for a mold

Abstract

The present invention provides a multi-stage linkage demoulding mechanism for a mold, which belongs to the field of mold technology. It solves the problem in the prior art that it is difficult to demould a product. The multi-stage linkage demoulding mechanism of the mold comprises a core, a movable mold and a fixed mold located above the movable mold. The core comprises a fixed core fixedly arranged on the fixed mold and a movable core slidingly resting on the fixed core. An insert is embedded in the fixed core. The multi-stage linkage demoulding mechanism comprises a sliding seat slidingly arranged on the movable mold and a driving assembly capable of driving the sliding seat to slide back and forth in a horizontal direction. A vertically arranged push rod capable of pushing the insert outward is connected to the fixed core. The push rod and the movable core are both connected to the sliding seat, and the sliding seat can drive the push rod and the movable core to move downward together when it moves horizontally. The fixed core is also provided with a reset member capable of driving the insert to retract inward into the fixed core after the push rod moves downward. The present invention ensures that product demoulding is more convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a multi-stage linkage demoulding mechanism of a mold. Background Art

[0002] During the molding process, inserts are often placed on the mold core to create circular or square holes, or other accessory structures, in the product. During injection molding, the portion of the insert protruding from the core surface acts as a barrier to the molten material, thus creating a circular or square hole in the product. However, when a plastic product has circular or square holes on its side, a side core pulling mechanism must be employed. Its basic principle is to convert the vertical movement of the mold opening and closing into the horizontal movement of the insert, allowing the product to be smoothly demolded.

[0003] For example, a patent document discloses an injection mold with an inclined ejector cylinder combined with a sequential inner and outer undercut mechanism (application number: 201320738345.8). The mold cavity is provided with a side core hole, in which a side core is provided. One end of the side core cooperates with the outer concave of the plastic part, and the other end cooperates with a T-shaped chute. During the production process, after the plastic part is injection molded, the piston rod of the oil cylinder drives the inclined slider downward. Since the inclined slider cooperates with the side core via the T-shaped chute, when the inclined slider moves downward, it drives the side core to slide parallel to the right, so that one end of the side core exits the outer concave of the plastic part, realizing side core pulling. During use, this mold has the following shortcomings: first, an additional oil cylinder is provided in the mold to realize side core pulling, and at this time, a corresponding oil circuit must be connected to enable the oil cylinder to work, resulting in a relatively complex equipment structure and increased cost. In addition, the plastic part is lifted upward by the ejector pin and the inclined ejector, so that the plastic part is separated from the core and the mold is demoulded. This demoulding method is mainly suitable for products with smaller areas. If this demolding method is used for products with a larger area, due to the large contact area between the product and the core, and the vacuum formed between the product and the core without air pressure, the product will stick tightly to the molding surface of the core under the action of external air pressure. At this time, if the plastic product is directly lifted up by the ejector pin and the inclined ejector, it is very easy to cause the product to deform or even be damaged, making the product demolding process more difficult. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a multi-stage linkage demoulding mechanism for the mold. The technical problem solved by the present invention is: making product demoulding more convenient on the basis of achieving cost control.

[0005] The objectives of the present invention can be achieved through the following technical solutions: a multi-stage linkage demolding mechanism for a mold, the mold including a core, a movable mold and a fixed mold located above the movable mold, the core including a fixed core fixedly arranged on the fixed mold and a movable core slidingly resting on the fixed core, an insert being embedded in the fixed core, and characterized in that the multi-stage linkage demolding mechanism includes a sliding seat slidingly arranged on the movable mold and a driving assembly that can drive the sliding seat to slide back and forth in a horizontal direction, a vertically arranged push rod that can push the insert outward is connected to the fixed core, the push rod and the movable core are both connected to the sliding seat, and the sliding seat can drive the push rod and the movable core to move downward together when it moves horizontally, and the fixed core is also provided with a reset part that can drive the insert to retract inward into the fixed core after the push rod moves downward.

[0006] In this mold, a push rod is connected vertically to the fixed core, and the insert is pushed outward by the push rod, so that the protrusion on the insert can be maintained in a state of protruding from the surface of the fixed core, thereby forming a mounting hole at the corresponding position on the product after the injection molding is completed. The sliding seat is slidably arranged on the movable mold, so that the movable mold can stably support the sliding seat for movement, and when the driving assembly drives the sliding seat to slide horizontally, it can drive the push rod and the movable core to move downward together. The downward movement of the push rod can drive the insert to retract inward into the fixed core, realizing the side core pulling of the insert, and the downward movement of the movable core can reduce the contact area between the product and the core, so that the adsorption force between the product and the molding surface of the core is greatly reduced, so that in the subsequent steps, the product can be smoothly pushed upward by the ejector pin to achieve demolding. That is to say, through the coordinated cooperation of the sliding seat, the push rod and the movable core, the movement of the sliding seat can synchronously realize the side core pulling of the insert and the separation of the movable core from the product surface, ensuring that the product demolding is more convenient without causing deformation and damage to the product. Moreover, since this structure does not require separate power mechanisms to drive the insert and the movable core, the structure of the demolding mechanism can be simplified, the manufacturing cost can be reduced, and it has the advantage of a compact structure.

[0007] In the aforementioned multi-stage demolding mechanism, an insert guide groove is defined on the outer wall of the fixed core, within which the insert slides. The upper end of the push rod has an inclined push surface, and the inner end of the insert has a contact surface that abuts against the push surface. When the push rod moves upward until the push surface abuts the contact surface, the inclined push surface generates a force component that pushes the insert outward, maintaining the protrusion on the insert protruding from the molding surface of the fixed core. The insert slides within the insert guide groove, ensuring stable expansion and contraction of the insert, thereby enhancing the operational reliability and stability of the mold.

[0008] In the aforementioned multi-stage linkage demolding mechanism, the reset element is a spring. The insert is provided with a protrusion having a spring mounting hole. The fixed core is fixedly connected to a stopper located outside the protrusion. One end of the spring is located within the spring mounting hole, and the other end abuts the stopper. When the push rod moves upward, the spring is compressed, and the stopper prevents the insert from slipping out of the insert guide groove. When the push rod moves downward, the push surface on the push rod disengages the abutment surface on the insert. The spring then allows the insert to retract inwardly into the fixed core, thereby achieving side core pulling of the insert.

[0009] In the multi-stage linkage demolding mechanism of the mold described above, a push rod seat is fixedly connected to the sliding seat. A T-shaped chute 1 is provided on the top surface of the push rod seat. The T-shaped chute 1 gradually tilts downward from one end away from the movable core to the other end. The push rod is slidably inserted into the fixed core, and the lower end of the push rod is slidably connected to the T-shaped chute 1. Because the T-shaped chute 1 gradually tilts downward from one end away from the movable core to the other end, when the drive assembly drives the sliding seat toward a direction away from the movable core, it can drive the push rod downward, thereby achieving side core pulling of the insert. Conversely, when the sliding seat moves toward a direction close to the movable core, it can drive the push rod upward, ejecting the insert outward to the protrusion on its surface protruding from the molding surface of the fixed core.

[0010] In the aforementioned multi-stage demolding mechanism, the top surface of the sliding seat is provided with a mounting groove, and the push rod seat is disposed within the mounting groove and secured to the sliding seat via fasteners. This arrangement facilitates easy installation and provides excellent mounting stability, ensuring that the push rod seat stably drives the push rod downward, thereby ensuring a stable and reliable demolding process.

[0011] In the multi-stage linkage demolding mechanism of the above-mentioned mold, the driving assembly includes a slider fixedly connected to the fixed mold, a guide groove is provided on the side wall of the movable mold, and the slider is vertically slidable in the guide groove. The slider is fixedly connected to an inclined guide rod, and the sliding seat is provided with an inclined guide hole. The inclined guide rod is inserted into the guide hole, and the guide hole is gradually inclined from the upper end to the lower end in the direction away from the movable core. The guide groove is provided on the side wall of the movable mold, and the guide groove forms a guiding fit with the slider, so that the relative movement process of the slider and the movable mold is relatively stable. When the movable mold moves downward, the inclined guide rod cannot move downward due to being fixed to the slider, but because the inclined guide rod is plug-fitted with the guide hole on the sliding seat, the sliding seat can move in the direction away from the movable core. Conversely, when the movable mold moves upward for mold closing, the inclined guide rod can guide the sliding seat to move in the direction close to the movable core.

[0012] In the above-mentioned multi-stage linkage demoulding mechanism of the mold, the driving component is a horizontally arranged cylinder, which is fixed to the movable mold, and the piston rod of the cylinder is connected to the sliding seat. The horizontal back and forth movement of the sliding seat is achieved by the extension and contraction of the cylinder piston rod.

[0013] In the aforementioned multi-stage linkage demolding mechanism, the sliding seat has an inclined support surface at one end near the movable core, against which the lower end face of the movable core slides. A second T-shaped chute is also provided in the middle of the support surface. A guide slide is fixedly attached to the lower end face of the movable core, and the guide slide slide is slidably connected within the second T-shaped chute. This design enables linkage between the sliding seat and the movable core, enabling the sliding seat to drive the movable core up and down as it moves back and forth horizontally.

[0014] In the aforementioned multi-stage demolding mechanism, the guide slide has a greater hardness than the movable core. The movable core can be made of a material with a lower hardness, facilitating the processing of complex molding surfaces on the movable core. The guide slide can also be made of a material with a higher hardness and strength than the movable core, ensuring a long-term, stable, and highly precise sliding fit between the guide plate and the second T-shaped chute.

[0015] In the multi-stage linkage demolding mechanism described above, a mounting groove is defined on the bottom surface of the movable mold, within which the sliding seat slides. The sidewalls of the mounting groove have limiting steps, and the sidewalls of the sliding seat also have stepped surfaces that abut against the limiting steps when the sliding seat moves away from the movable core. The mounting groove guides the sliding seat, stabilizing its movement. The limiting steps abut against the stepped surfaces, limiting the sliding seat's travel away from the movable core.

[0016] Compared with the existing technology, the multi-stage linkage demoulding mechanism of this mold has the following advantages: through the coordinated cooperation of the sliding seat, the push rod and the movable core, the movement of the sliding seat can synchronously realize the side core pulling of the insert and the separation of the movable core from the product surface, ensuring that the product demoulding is more convenient and will not cause deformation and damage to the product. Moreover, since this structure does not require separate power mechanisms to drive the insert and the movable core, the structure of the demoulding mechanism can be simplified, the manufacturing cost can be reduced, and it has the advantage of a compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the mold.

[0018] Figure 2 It is a three-dimensional structural diagram of the multi-stage linkage demoulding mechanism.

[0019] Figure 3 This is a bottom view of the multi-stage linkage demoulding mechanism.

[0020] Figure 4 yes Figure 3 Cross-sectional view of AA in the figure.

[0021] Figure 5 It is a schematic diagram of the connection structure of the slider, sliding seat and core.

[0022] Figure 6 It is a partial cross-sectional view of the multi-stage linkage demoulding mechanism.

[0023] Figure 7 It is a schematic diagram of the connection structure of the sliding seat, push rod, movable core and insert.

[0024] Figure 8 It is an exploded view of the sliding seat, push rod, movable core and insert.

[0025] Figure 9 It is a schematic diagram of the connection structure between the push rod and the insert.

[0026] In the figure, 1, movable mold; 1a, guide groove; 1b, mounting groove; 1b1, limiting step; 2, core; 21, fixed core; 211, insert guide groove; 22, movable core; 3, fixed mold; 4, insert; 41, abutment surface; 42, protrusion; 43, protrusion; 44, spring mounting hole; 5, sliding seat; 51, mounting groove; 52, guide through hole; 53, supporting inclined surface; 54, T-shaped slide groove 2; 55, step surface; 6, push rod; 61, push surface; 7, spring; 8, abutment plate; 9, guide slide; 10, push rod seat; 101, T-shaped slide groove 1; 11, slider; 12, oblique guide rod. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0028] Example 1

[0029] like Figure 1 and Figure 2 As shown, in the multi-stage linkage demolding mechanism of the present mold, the mold includes a core 2, a movable mold 1 and a fixed mold 3 located above the movable mold 1. The core 2 includes a fixed core 21 fixedly set on the fixed mold 3 and a movable core 22 slidingly abutting against the fixed core 21. An insert 4 is embedded in the fixed core 21, and a protrusion 43 on the insert 4 protrudes from the surface of the fixed core 21, thereby forming a mounting hole at a corresponding position on the product after the injection molding is completed.

[0030] like Figures 3 to 6As shown, the demoulding mechanism includes a sliding seat 5 slidably arranged on the movable mold 1 and a driving assembly that can drive the sliding seat 5 to slide back and forth in the horizontal direction. The fixed core 21 is connected to a vertically arranged push rod 6 that can push the insert 4 outward. The push rod 6 and the movable core 22 are both connected to the sliding seat 5, and the sliding seat 5 can drive the push rod 6 and the movable core 22 to move downward together when it moves horizontally. The fixed core 21 is also provided with a reset member that can drive the insert 4 to retract inward into the fixed core 21 after the push rod 6 moves downward.

[0031] Such as 4 and Figure 5 As shown, the driving assembly includes a slider 11 fixedly connected to the fixed mold 3, a guide groove 1a is provided on the side wall of the movable mold 1, the slider 11 is vertically slidably arranged in the guide groove 1a, an inclined guide rod 12 is fixedly connected to the slider 11, and an inclined guide hole 52 is provided on the sliding seat 5. The inclined guide rod 12 is passed through the guide hole 52, and the guide hole 52 is gradually inclined from the upper end to the lower end in the direction away from the movable core 22.

[0032] like Figure 3 As shown, the bottom surface of the movable mold 1 is provided with a mounting groove 1b, within which the sliding seat 5 slides. The sidewalls of the mounting groove 1b are provided with a stopper step 1b1. The sidewalls of the sliding seat 5 also have a stepped surface 55. The stepped surface 55 abuts against the stopper step 1b1 as the sliding seat 5 moves away from the movable core 22. The mounting groove 1b guides the sliding of the sliding seat 5, ensuring more stable movement. The stopper step 1b1 abuts against the stepped surface 55, limiting the travel of the sliding seat 5 away from the movable core 22.

[0033] like Figure 6 and Figure 7 As shown, the outer wall of the fixed core 21 is provided with an insert guide groove 211, and the insert 4 is slidably arranged in the insert guide groove 211. The upper end of the push rod 6 has an inclined push surface 61, and the inner end of the insert 4 has a contact surface 41 that contacts and cooperates with the push surface 61. The reset member is a spring 7, combined with Figure 9As shown, the insert 4 is provided with a protrusion 42, which is provided with a spring mounting hole 44. A support plate 8 is fixedly connected to the fixed core 21 and is located outside the protrusion 42. One end of the spring 7 is located in the spring mounting hole 44, and the other end abuts against the support plate 8. When the push rod 6 moves upward until the push surface 61 abuts the abutment surface 41, the push surface 61 is inclined, thereby generating a component force that pushes the insert 4 outward, so that the protrusion 43 on the insert 4 can remain in a state of protruding from the molding surface of the fixed core 21. When the push rod 6 moves upward, the spring 7 is compressed, and the support plate 8 can prevent the insert 4 from slipping out of the insert guide groove 211. When the push rod 6 moves downward, the push surface 61 on the push rod 6 disengages from the abutment surface 41 on the insert 4. At this time, the spring 7 can cause the insert 4 to retract inward into the fixed core 21, realizing the side core pulling of the insert 4.

[0034] like Figure 6 and Figure 8 As shown, the sliding seat 5 is fixedly connected to a push rod seat 10. The top surface of the push rod seat 10 is provided with an inclined T-shaped slot 101, which gradually slopes downward from one end away from the movable core 22 to the other end. A push rod 6 is slidably inserted into the fixed core 21, and the lower end of the push rod 6 is slidably connected to the T-shaped slot 101. When the drive assembly drives the sliding seat 5 away from the movable core 22, it drives the push rod 6 downward, thereby achieving side core pulling of the insert 4. Conversely, when the sliding seat 5 moves toward the movable core 22, it drives the push rod 6 upward, ejecting the insert 4 outward until the protrusion 43 on its surface protrudes from the molding surface of the fixed core 21. To facilitate the installation of the push rod seat 10, a mounting groove 51 is provided on the top surface of the sliding seat 5. The push rod seat 10 is positioned within the mounting groove 51 and is fixedly connected to the sliding seat 5 via fasteners, preferably bolts, which are not shown.

[0035] Combine Figure 4 and Figure 8 As shown, the sliding seat 5 has an inclined supporting slope 53 at one end close to the movable core 22, and the lower end surface of the movable core 22 slides against the supporting slope 53. A T-shaped slide groove 2 54 is also provided in the middle of the supporting slope 53. A guide slide 9 is fixedly connected to the lower end surface of the movable core 22, and the guide slide 9 is slidably connected in the T-shaped slide groove 2 54.

[0036] The following briefly introduces the working principle of this multi-stage linkage demoulding mechanism: Figure 1 and Figure 4As shown, in the mold-closed state, the protrusion 43 on the insert 4 can remain in a state protruding from the surface of the fixed core 21, thereby forming a mounting hole at a corresponding position on the product after the injection molding is completed. When the injection molding is completed, the movable mold 1 moves downward. At this time, the inclined guide rod 12 is fixedly connected to the slider 11 and cannot move downward. At the same time, the inclined guide rod 12 is plugged into the guide hole 52 on the sliding seat 5, so the sliding seat 5 can move in a direction away from the movable core 22. At the same time, the sliding seat 5 drives the push rod 6 and the movable core 22 to move downward together. The downward movement of the push rod 6 drives the insert 4 to retract inward into the fixed core 21, realizing the side core pulling of the insert 4. The movable core 22 moves downward, and the ejector pins are used to push the product upward to achieve demolding. The ejector pins are a conventional mold technology and are not shown in the figure.

[0037] On the contrary, when the movable mold 1 moves upward to close the mold, the inclined guide rod 12 can guide the sliding seat 5 to move toward the direction close to the movable core 22, driving the sliding seat 5 to drive the push rod 6 and the movable core 22 to move upward together to reach the Figure 1 and 4 The mold is in the closed state shown, and injection molding can be performed again.

[0038] Example 2

[0039] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that the driving assembly is a horizontally arranged cylinder, which is fixed to the movable mold 1, and the piston rod of the cylinder is connected to the sliding seat 5. The horizontal back and forth movement of the sliding seat 5 is achieved by the extension and contraction of the cylinder piston rod.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0041] Although this document frequently uses terms such as 1. movable mold; 1a. guide groove; 1b. mounting groove; 1b1. limiting step; 2. core; 21. fixed core; 211. insert guide groove; 22. movable core; 3. fixed mold; 4. insert; 41. abutment surface; 42. protrusion; 43. projection; 44. spring mounting hole; 5. sliding seat; 51. mounting groove; 52. guide through hole; 53. support inclined surface; 54. T-shaped chute 2; 55. step surface; 6. push rod; 61. push surface; 7. spring; 8. abutment plate; 9. guide slide; 10. push rod seat; 101. T-shaped chute 1; 11. slide block; 12. inclined guide rod, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A multi-stage linkage demoulding mechanism for a mold, the mold comprising a movable mold (1), a core (2) and a fixed mold (3) located above the movable mold (1), the core (2) comprising a fixed core (21) fixedly arranged on the fixed mold (3) and a movable core (22) slidingly abutting against the fixed core (21), the fixed core (21) being embedded with an insert (4), characterized in that: The multi-stage linkage demoulding mechanism comprises a sliding seat (5) slidably arranged on a movable mold (1) and a driving assembly capable of driving the sliding seat (5) to slide back and forth in a horizontal direction. The fixed core (21) is connected to a vertically arranged push rod (6) capable of pushing the insert (4) outward. The upper end of the push rod (6) has an inclined push surface (61), and the inner end of the insert (4) has a contact surface (41) that contacts and cooperates with the push surface (61). The sliding seat (5) is fixedly connected with a push rod seat (10), and a T-shaped slide groove (101) is provided on the top surface of the push rod seat (10), and the T-shaped slide groove (101) is gradually inclined downward from one end away from the movable core (22) to the other end. The push rod (6) is slidably passed through the fixed core (21), and the lower end of the push rod (6) is slidably connected to the T-shaped slide groove (101); the end of the sliding seat (5) close to the movable core (22) The movable core (22) has an inclined support surface (53), the lower end surface of the movable core (22) slides against the support surface (53), the support surface (53) is further provided with a second T-shaped slide groove (54), the lower end surface of the movable core (22) is fixedly connected with a guide slide (9), the guide slide (9) is slidably connected in the second T-shaped slide groove (54), and the sliding seat (5) can drive the push rod (6) and the movable core (22) to move downward together through horizontal movement; The fixed core (21) is also provided with a reset member capable of driving the insert (4) to retract inwardly into the fixed core (21) after the push rod (6) moves downward.

2. The multi-stage linkage demoulding mechanism of the mold according to claim 1, characterized in that: An insert guide groove (211) is provided on the outer wall of the fixed core (21), and the insert (4) is slidably arranged in the insert guide groove (211).

3. The multi-stage linkage demoulding mechanism of the mold according to claim 1, characterized in that: The reset member is a spring (7), the insert (4) is provided with a protrusion (42), the protrusion (42) is provided with a spring mounting hole (44), the fixed core (21) is fixedly connected with a supporting piece (8) located outside the protrusion (42), one end of the spring (7) is located in the spring mounting hole (44), and the other end is against the supporting piece (8).

4. The multi-stage linkage demoulding mechanism of the mold according to any one of claims 1 to 3, characterized in that: A mounting groove (51) is provided on the top surface of the sliding seat (5), and the push rod seat (10) is arranged in the mounting groove (51) and is fixedly connected to the sliding seat (5) via a fastener.

5. The multi-stage linkage demoulding mechanism of the mold according to any one of claims 1 to 3, characterized in that: The driving assembly comprises a slider (11) fixedly connected to the fixed mold (3); a guide groove (1a) is provided on the side wall of the movable mold (1); the slider (11) is vertically slidably arranged in the guide groove (1a); an inclined guide rod (12) is fixedly connected to the slider (11); an inclined guide through hole (52) is provided on the sliding seat (5); the inclined guide rod (12) is passed through the guide through hole (52); and the guide through hole (52) is gradually inclined from the upper end to the lower end in a direction away from the movable core (22).

6. The multi-stage linkage demoulding mechanism of the mold according to any one of claims 1 to 3, characterized in that: The driving assembly is a horizontally arranged cylinder, the cylinder is fixedly connected to the movable mold (1), and the piston rod of the cylinder is connected to the sliding seat (5).

7. The multi-stage linkage demoulding mechanism of the mold according to any one of claims 1 to 3, characterized in that: The hardness of the guide slide plate (9) is greater than the hardness of the movable core (22).

8. The multi-stage linkage demoulding mechanism of the mold according to any one of claims 1 to 3, characterized in that: A mounting groove (1b) is provided on the bottom surface of the movable mold (1), and the sliding seat (5) is slidably arranged in the mounting groove (1b). A limiting step (1b1) is provided on the side wall of the mounting groove (1b), and a step surface (55) is provided on the side wall of the sliding seat (5). When the sliding seat (5) moves in a direction away from the movable core (22), the step surface (55) can abut against the limiting step (1b1).

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