A three-stage linkage demolding mechanism of a mold

Abstract

The utility model belongs to mould technical field. It solves the problem of poor product forming quality of hydraulic demoulding structure in prior art. Provide a kind of three-stage linkage demoulding mechanism of mould, including the second inclined guide column that is obliquely inclined with first inclined guide column and is fixed on fixed mould, first slider has the first inclined hole that is set along vertical and cross section is strip-shaped, second slider has the second inclined hole that is set along vertical and cross section is oval, the vertical length of second inclined hole is less than the vertical length of first inclined hole, first inclined guide column and second inclined guide column are side by side arrangement and are respectively inserted in first inclined hole and second inclined hole, when opening mould, second inclined guide column moves second slider to move, to make second slider drive third slider move downward along inclined rail relative to first slider, and when second slider is separated from second inclined guide column, first inclined guide column moves first slider. The utility model has the advantages of demoulding to multidirectional reverse buckle product while improving product forming quality.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a three-stage linkage demolding mechanism for molds. Background Technology

[0002] Injection molds are tools used to produce plastic products. During injection molding, the mold is clamped on an injection molding machine, and molten plastic is injected into the molding cavity of the mold. The plastic cools and solidifies within the cavity, and then the upper and lower molds separate. The ejection system pushes the product out of the mold cavity, and the mold closes again for the next injection molding cycle. Currently, plastic products on the market are becoming increasingly diverse. Many plastic products require the simultaneous molding of auxiliary structures such as snap-fits or teeth during injection molding. Therefore, multiple sliders and cores are needed to form the molding cavity. The presence of snap-fits or teeth restricts the design direction of the slider's core-pulling. The corresponding slider needs to be pulled out in the direction of the snap-fit ​​or teeth. In other words, the extraction direction of sliders with snap-fits or teeth will inevitably be different from the extraction direction of other sliders.

[0003] For example, Chinese patent literature discloses a sequential release mechanism for internal and external undercuts using a combination of inclined ejector cylinders in an injection mold (authorization announcement number: CN203622842U), which includes upper and lower plates. A positioning ring and a gate bushing are installed in the upper plate, and a cavity is located below the upper plate. A through hole is opened in the lower plate, and a limit pin and mold feet are installed on the lower plate. Upper and lower ejector plates are located between the mold feet. An injection molding machine ejector rod passes through the through hole and contacts the lower ejector plate. Ejector pins are installed between the upper and lower ejector plates, and a core and cavity are located on the mold feet. There is a plastic part in between, with external concave and internal convex shapes. A bracket is installed on one side of the cavity, and the hydraulic cylinder is mounted on the bracket via a cylinder fixing plate. The piston rod of the hydraulic cylinder is connected to a T-shaped groove on the inclined slider. A side core hole is opened in the cavity, with one end of the side core engaging with the external concave part of the plastic part and the other end engaging with the T-shaped groove. Slider seats on the upper and lower ejector plates have transverse grooves with connecting pins. The connecting pins connect to the inclined ejector. An inclined guide groove is opened on the core, and the inclined ejector passes through the inclined guide groove. A groove is made on the inclined ejector to engage with the internal convex part of the plastic part. During production, after the plastic part is injection molded, the piston rod of the hydraulic cylinder drives the inclined slider to move downwards. Because the inclined slider engages with the side core via the T-shaped groove, when the inclined slider moves downwards, it drives the side core to slide parallel to the right, causing one end of the side core to exit the external concave part of the plastic part, thus achieving side core pulling.

[0004] The following shortcomings exist in the use of this injection mold inclined top cylinder combination sequence unhooking mechanism: This injection mold requires an additional cylinder to achieve side core pulling. The output shaft of the cylinder is set vertically upward and connected to the inclined slide. However, due to common problems in hydraulic systems such as insufficient cylinder pressure, insufficient cylinder output force, and internal leakage of the cylinder, coupled with the influence of gravity, when using this cylinder for core pulling, the locking force of the cylinder output shaft on the inclined slide is easily insufficient. When the mold is fixed, the inclined slide tends to slide downward, causing the limit block slidably connected to the inclined slide to also shift. This makes it very easy to generate flash during product molding, resulting in poor molding quality of the injection molded product. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a three-stage linkage demolding mechanism for molds. The technical problem this invention aims to solve is how to improve product molding quality while simultaneously demolding products with multi-directional undercuts.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A three-stage linkage demolding mechanism for a mold, the mold comprising a moving mold, a fixed mold, and a first inclined guide post fixed to the fixed mold, wherein a first slider, a second slider, and a third slider are disposed between the moving mold and the fixed mold, the third slider having vertically upward protruding forming teeth, characterized in that the first slider is slidably connected to the moving mold horizontally, the second slider is slidably connected to the first slider horizontally, the second slider has an inclined guide rail arranged downwardly from the inside to the outside, the third slider is slidably connected to the inclined guide rail, and the side of the third slider is slidably connected to the first slider in the vertical direction, this three-stage linkage demolding mechanism comprising a first slider fixed to the fixed mold and a second slider being slidably connected to the first slider vertically. The first slider has a first oblique hole with a vertical cross-section and a strip-shaped opening on the first slider, and the second slider has a second oblique hole with a vertical cross-section and an elliptical opening on the second slider. The vertical length of the second oblique hole is less than the vertical length of the first oblique hole. The first oblique guide post and the second oblique guide post are arranged side by side and inserted into the first oblique hole and the second oblique hole respectively. When the mold is opened, the second oblique guide post moves the second slider so that the second slider drives the third slider to move downward relative to the first slider along the oblique guide rail. When the second slider disengages from the second oblique guide post, the first oblique guide post moves the first slider.

[0008] Unlike existing hydraulic demolding structures, this mold's three-stage linkage demolding mechanism creatively employs a double-push-rod demolding structure. This allows for the core-pulling action of the first, second, and third sliders in different directions using only the step-by-step movement of two parallel, unidirectionally inclined first and second guide pillars. Furthermore, both the first and second guide pillars possess sufficient strength and rigidity, enabling them to jointly limit the movement of the first, second, and third sliders during mold closing. This provides excellent locking and limiting effect and high reliability, preventing loosening of the three sliders during mold closing. This, in turn, improves product molding quality while enabling demolding of products with multi-directional undercuts. Additionally, the double-push-rod structure of the parallel, unidirectionally inclined first and second guide pillars allows this three-stage linkage demolding mechanism to be used for products with larger molding dimensions, offering greater versatility.

[0009] Specifically, the first, second, and third sliders are all used to cooperate with the mold core to form the product. The third slider has forming teeth that are vertically raised and used for forming the tooth shape. By horizontally sliding the first slider on the moving mold and horizontally sliding the second slider above the first slider, and by designing a downward inclined guide rail on the second slider, the bottom of the third slider is slidably connected to the inclined guide rail, and the side of the third slider is slidably connected to the first slider in the vertical direction, the above structural design allows the third slider to move vertically when the first slider is stationary and the second slider slides horizontally relative to the first slider. Since the forming teeth on the third slider are also vertically raised, the third slider can complete the core-pulling operation of unhooking under the action of the second slider.

[0010] Based on the aforementioned slider linkage design, the first slider has a first oblique hole with a vertically oriented, strip-shaped cross-section, and the second slider has a second oblique hole with a vertically oriented, elliptical cross-section. The vertical length of the second oblique hole is less than that of the first oblique hole. The first and second oblique guide pillars are respectively inserted into the first and second oblique holes. In the initial demolding stage, the first oblique guide pillar, by pressing against the wall of the second oblique hole, pushes the second slider away from the core relative to the first slider, performing a core-pulling action. Simultaneously, the third slider, driven by the second slider, performs a downward core-pulling action to release the undercut. This continues until the second slider disengages from the second oblique guide pillar, and the first oblique guide pillar moves to contact the outer wall of the first oblique hole. At this point, the first oblique... The guide pillars can move the first slider away from the core, causing it to pull the core out. Since the second and third sliders are horizontally connected to the first slider, they remain relatively stationary vertically. This means that the second and third sliders will also move outward along with the first slider until the demolding action is completed. This allows the three sliders to pull the core in different directions by using only the step-by-step movement of the first and second inclined guide pillars, which are designed to be inclined in the same direction. When the mold is closed, the first and second inclined guide pillars can also limit the movement of the first, second, and third sliders, preventing them from loosening during mold closing. This allows for demolding of multi-directional undercut products while improving the product molding quality.

[0011] In the aforementioned three-stage linkage demolding mechanism for a mold, a first locking module is also fixedly connected to the fixed mold. The upper end of the first inclined guide post is inserted into the first locking module. The inner side of the first locking module has a vertically arranged positioning surface. The outer end face of the first slider abuts against the positioning surface, and when the second slider disengages from the second inclined guide post, the first slider disengages from the positioning surface. The vertical positioning surface makes it less likely for the first slider to loosen during mold closing, which is beneficial to improving the molding quality of the mold. At the same time, it ensures that the first slider does not move during the initial stage of demolding (i.e., before the first slider disengages from the positioning surface), thus achieving orderly demolding of the second slider, the third slider, and the first slider.

[0012] In the aforementioned three-stage linkage demolding mechanism for a mold, a second locking module is also fixedly connected to the fixed mold. The upper end of the second inclined guide post is inserted into the second locking module, and when the mold is in the closed state, the lower surface of the second locking module abuts against the upper surface of the second slider. This prevents the second slider from loosening during mold closing, which helps improve the molding quality of the mold.

[0013] In the aforementioned three-stage linkage demolding mechanism for a mold, a first limiter is mounted on the first slider, and the first limiter has a first limiting tooth. Two first limiting grooves are spaced apart on the bottom surface of the second slider, and the first limiting tooth is located within one of the first limiting grooves. During mold closing, the first limiting tooth is located within one of the first limiting grooves, ensuring that the second inclined guide post can be accurately inserted into the second inclined hole. During mold opening, the first limiting tooth is located within the other first limiting groove, ensuring the accuracy of the second slider's positional movement.

[0014] In the aforementioned three-stage linkage demolding mechanism for a mold, a second limiter is installed on the moving mold. The moving mold has an mounting groove, and the second limiter includes a spring vertically installed in the mounting groove and a telescopic block connected to the top of the spring. Two second limit grooves are spaced apart on the bottom surface of the first slider, and the top of the telescopic block is embedded in one of the second limit grooves. During mold closing, the second limit tooth is located in one of the second limit grooves, ensuring that the first inclined guide post can be accurately inserted into the first inclined hole during mold closing. During mold opening, the second limit tooth is located in the other second limit groove, ensuring the accuracy of the first slider's position movement.

[0015] In the aforementioned three-stage linkage demolding mechanism for a mold, the first slider has a downwardly recessed groove. The second and third sliders are sequentially disposed within the groove from bottom to top. The groove has vertically formed grooves on both sides of its side walls near the front end of the first slider. The third slider has lateral protrusions on both sides corresponding to the grooves on the same side. These lateral protrusions slidably insert into their respective grooves. The forming teeth are located at the front end of the third slider and extend upwards beyond the first slider. The placement of the second and third sliders within the grooves makes their sliding motion less susceptible to external interference. The cooperation of the lateral protrusions and grooves makes the linkage between the third and first sliders more stable, thereby improving core-pulling efficiency and the molding quality of the mold.

[0016] In the aforementioned three-stage linkage demolding mechanism for a mold, the front end of the second slider has a downwardly sloping surface from the inside out. The inclined guide rail is located on the sloping surface, and the bottom of the third slider has a dovetail groove. The inclined guide rail and the dovetail groove are slidably connected, and the bottom surface of the third slider is abutted against the sloping surface of the second slider. This allows the third slider to move downwards along the groove of the first slider through the cooperation of the dovetail groove and the inclined guide rail when the second slider is moved by the second inclined guide post. Simultaneously, the linkage between the third slider, the second slider, and the first slider is tight and stable, thus helping to ensure core-pulling efficiency and improve the molding quality of the mold.

[0017] In the aforementioned three-stage linkage demolding mechanism for a mold, the lateral protrusion on the third slider extends downward to the outside of the side of the second slider and abuts against the corresponding side of the second slider. This ensures that one side of the lateral protrusion on the third slider is located within a groove and engages with the first slider, while the other side engages with the side of the second slider. This results in a tighter linkage and better stability among the third, second, and first sliders, thereby improving core-pulling efficiency and molding quality.

[0018] In the aforementioned three-stage linkage demolding mechanism for a mold, a first guide rail is fixedly connected to the inner wall of the groove, and a horizontally arranged first slide rail is formed between the first guide rail and the bottom surface of the groove. The side of the second slider is slidably connected to the first slide rail. This improves the accuracy of the second slider's position movement, thereby enhancing the molding quality of the mold.

[0019] In the aforementioned three-stage linkage demolding mechanism of a mold, a second guide rail and a wear-resistant plate are fixedly connected to the moving mold. The wear-resistant plate has clearance holes for the first inclined guide post to pass through. A horizontally arranged second slide rail is formed between the second guide rail and the wear-resistant plate, and the side of the first slider is slidably connected to the second slide rail. On the one hand, the wear-resistant plate can form a second slide rail with the second guide rail, ensuring the accuracy of the first slider's position movement. On the other hand, the wear-resistant plate helps to improve the service life of the first slider, ensuring the accuracy of both, thereby improving the molding quality of the mold.

[0020] Compared with existing technologies, the advantages of the three-stage linkage demolding mechanism of this mold are as follows: The three-stage linkage demolding mechanism of this mold, through the linkage of the first slider, the second slider and the third slider, enables the core-pulling action of the above three sliders in different directions by only using the step-by-step movement of the first and second inclined guide pillars with the same directional inclination design. When the mold is closed, the first and second inclined guide pillars can also play a role in limiting the movement of the first slider, the second slider and the third slider, preventing the above three sliders from loosening when the mold is closed, thereby improving the product molding quality while realizing the demolding of multi-directional undercut products. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a mold containing this three-stage linkage demolding mechanism.

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of a mold containing this three-stage linkage demolding mechanism in the mold-closed state.

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of a mold containing this three-stage linkage demolding mechanism in the mold opening state.

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of a mold with this three-stage linkage demolding mechanism in the open state.

[0025] Figure 5 This is a schematic diagram of the three-stage linkage demolding mechanism installed on the moving mold.

[0026] Figure 6 This is a schematic diagram of the assembly structure of the three-stage linkage demolding mechanism.

[0027] Figure 7 This is an exploded view of the three-stage linkage demolding mechanism.

[0028] Figure 8 This is a schematic diagram of the structure of the three-stage linkage demolding mechanism after the third slider slides along the inclined guide rail of the second slider.

[0029] In the diagram, 1 is the moving mold; 1a is the mounting slot; 2 is the fixed mold; 3 is the first inclined guide post; 4 is the second inclined guide post; 5 is the first slider; 5a is the first inclined hole; 5b is the second limiting groove; 5c is the groove; 5d is the slide groove; 6 is the second slider; 6a is the inclined guide rail; 6b is the second inclined hole; 6c is the first limiting groove; 6d is the inclined surface; 7 is the third slider; 7a is the forming tooth; 7b is the lateral protrusion; 7c is the dovetail groove; 8 is the first locking module; 8a is the positioning surface; 9 is the second locking module; 10 is the first limiter; 10a is the first limiting tooth; 11 is the second limiter; 11a is the spring; 11b is the telescopic block; 12 is the first guide rail pressure strip; 13 is the first slide rail; 14 is the second guide rail pressure strip; 15 is the wear-resistant plate; 15a is the clearance hole; 16 is the second slide rail. Detailed Implementation

[0030] 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.

[0031] A three-stage linkage demolding mechanism for a mold, as shown in the following figure. Figure 1-8The mold includes a moving mold 1, a fixed mold 2, and a first inclined guide post 3 fixed to the fixed mold 2. A first slider 5, a second slider 6, and a third slider 7 are arranged between the moving mold 1 and the fixed mold 2. The third slider 7 has vertically upward protruding forming teeth 7a. The first slider 5 is slidably connected to the moving mold 1 horizontally, and the second slider 6 is slidably connected to the first slider 5 horizontally. The second slider 6 has an inclined guide rail 6a arranged downwardly from the inside to the outside. The third slider 7 is slidably connected to the inclined guide rail 6a, and the side of the third slider 7 is slidably connected to the first slider 5 in the vertical direction. This three-stage linkage demolding mechanism includes a component fixed to the fixed mold 2 and aligned with the first inclined guide post 3. The first slider 5 has a first oblique hole 5a with a vertical opening and a strip-shaped cross-section, and the second slider 6 has a second oblique hole 6b with a vertical opening and an elliptical cross-section. The vertical length of the second oblique hole 6b is less than the vertical length of the first oblique hole 5a. The first oblique guide post 3 and the second oblique guide post 4 are arranged side by side and respectively inserted into the first oblique hole 5a and the second oblique hole 6b. When the mold is opened, the second oblique guide post 4 moves the second slider 6 so that the second slider 6 drives the third slider 7 to move downward relative to the first slider 5 along the oblique guide rail 6a. When the second slider 6 disengages from the second oblique guide post 4, the first oblique guide post 3 moves the first slider 5.

[0032] Reference Figure 2 , Figure 3 and Figure 4 Furthermore, a first locking module 8 is also fixedly connected to the fixed mold 2. The upper end of the first inclined guide post 3 is inserted into the first locking module 8. The inner side of the first locking module 8 has a vertically arranged positioning surface 8a. The outer end face of the first slider 5 abuts against the positioning surface 8a. When the second slider 6 disengages from the second inclined guide post 4, the first slider 5 disengages from the positioning surface 8a.

[0033] In this embodiment, a second locking module 9 is preferably fixedly connected to the fixed mold 2. The upper end of the second inclined guide post 4 is inserted into the second locking module 9, and when the mold is in the mold-closed state, the lower surface of the second locking module 9 abuts against the upper surface of the second slider 6.

[0034] Reference Figure 2 , Figure 3 and Figure 4 Furthermore, a first limiter 10 is installed on the first slider 5, and the first limiter 10 has a first limiting tooth 10a. The bottom surface of the second slider 6 is provided with two first limiting grooves 6c at intervals, and the first limiting tooth 10a is located in one of the first limiting grooves 6c.

[0035] Reference Figure 2 , Figure 3 and Figure 4 Furthermore, a second limiter 11 is installed on the moving mold 1. The moving mold 1 has a mounting groove 1a. The second limiter 11 includes a spring 11a vertically installed in the mounting groove 1a and a telescopic block 11b connected to the top of the spring 11a. The bottom surface of the first slider 5 is provided with two second limit grooves 5b at intervals. The top of the telescopic block 11b is embedded in one of the second limit grooves 5b.

[0036] Reference Figures 2-8 Specifically, the first slider 5 has a recessed groove 5c, the second slider 6 and the third slider 7 are arranged sequentially from bottom to top in the groove 5c, the groove 5c has vertically opened grooves 5d on the two side walls near the front end of the first slider 5, the third slider 7 has lateral protrusions 7b on both sides corresponding to the grooves 5d on the same side, the lateral protrusions 7b are slidably inserted into the corresponding grooves 5d, and the forming teeth 7a are located at the front end of the third slider 7 and extend upward from the first slider 5.

[0037] Reference Figures 2-8 More specifically, the front end of the second slider 6 has an inclined surface 6d that slopes downward from the inside out, the inclined guide rail 6a is located on the inclined surface 6d, the bottom of the third slider 7 has a dovetail groove 7c, the inclined guide rail 6a is slidably connected to the dovetail groove 7c, and the bottom surface of the third slider 7 is close to the inclined surface 6d of the second slider 6.

[0038] In this embodiment, the lateral protrusion 7b on the third slider 7 preferably extends downward to the outside of the side of the second slider 6 and abuts against the corresponding side of the second slider 6.

[0039] Reference Figures 2-8 More specifically, a first guide rail strip 12 is fixedly connected to the inner wall of the groove 5c, and a horizontally arranged first slide rail 13 is formed between the first guide rail strip 12 and the bottom surface of the groove 5c. The side of the second slider 6 is slidably connected to the first slide rail 13. A second guide rail strip 14 and a wear-resistant plate 15 are fixedly connected to the moving mold 1. The wear-resistant plate 15 has a clearance hole 15a for the first inclined guide post 3 to pass through. A horizontally arranged second slide rail 16 is formed between the second guide rail strip 14 and the wear-resistant plate 15. The side of the first slider 5 is slidably connected to the second slide rail 16.

[0040] The working principle of the three-stage linkage demolding mechanism of this mold is explained below:

[0041] like Figure 2As shown, when the mold is in the closed state, the first inclined guide post 3 and the second inclined guide post 4 are both installed on the fixed mold 2 side and inserted into the first inclined hole 5a and the second inclined hole 6b respectively. Since the first inclined guide post 3 is spaced apart from the outer end wall of the first inclined hole 5a by a certain distance, and the free travel distance of the first inclined guide post 3 is greater than the working distance of the second inclined guide post 4, and in the initial stage of mold opening, the positioning surface 8a on the inner side of the first locking module 8 is abutting against the outer end face of the first slider 5, the direct abutment ensures that the first slider 5 does not move when the second slider 6 moves outward under the action of the second inclined guide post 4. That is, only after the second inclined guide post 4 and the second slider 6 are separated can the first inclined guide post 3 contact the side wall of the first inclined hole 5a on the first slider 5. At this time, the first slider 5 also disengages from the positioning surface 8a, so that the first slider 5 can be demolded in the subsequent mold opening stroke.

[0042] When opening the mold, refer to Figure 3 The first inclined guide post 3 and the second inclined guide post 4 move away from the moving mold 1 along with the fixed mold 2. The first inclined guide post 3 pushes the second slider 6 away from the core by pressing the hole wall of the second inclined hole 6b. The third slider 7 moves downward in a core-pulling action relative to the first slider 5, while the third slider 7 moves downward in a core-pulling action to release the undercut under the drive of the second slider 6 (that is, the third slider 7 moves downward along the inclined guide rail 6a and the slide groove 5d relative to the first slider 5) until the second slider 6 disengages from the second inclined guide post 4. The second slider 6 and the third slider 7 stop moving. At this time, the first limiting tooth 10a is embedded in another first limiting groove 6c on the bottom surface of the second slider 6, thereby completing the first stage of the core-pulling action of the second slider 6 and the third slider 7.

[0043] Next, the first inclined guide post 3 and the second inclined guide post 4 continue to move away from the moving mold 1 along with the fixed mold 2. When the first inclined guide post 3 moves to contact the outer end wall of the first inclined hole 5a (located on the first slider 5), the first slider 5 also disengages from the positioning surface 8a. At this time, the first inclined guide post 3 can push the first slider 5 to move away from the core, causing the first slider 5 to perform a core-pulling action. Since the second slider 6 and the third slider 7 are both horizontally slidably connected to the first slider 5, they remain relatively stationary in the vertical direction. That is to say, at this time, the second slider 6 and the third slider 7 will also move outward along with the first slider 5 (the second slider 6 and the third slider 7 perform the second stage of core-pulling action) until the demolding action is finally completed (refer to...). Figure 4 ).

[0044] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model 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 this utility model or exceeding the scope defined by the appended claims.

[0045] Although this document frequently uses terms such as moving mold 1, mounting groove 1a, fixed mold 2, first inclined guide post 3, second inclined guide post 4, first slider 5, first inclined hole 5a, second limiting groove 5b, groove 5c, and slide 5d, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A three-stage linkage demolding mechanism for a mold, the mold comprising a moving mold (1), a fixed mold (2), and a first inclined guide post (3) fixedly connected to the fixed mold (2), wherein a first slider (5), a second slider (6), and a third slider (7) are disposed between the moving mold (1) and the fixed mold (2), the third slider (7) having vertically upward protruding forming teeth (7a), characterized in that, The first slider (5) is slidably connected to the moving mold (1) along the horizontal direction, and the second slider (6) is slidably connected to the first slider (5) along the horizontal direction. The second slider (6) has a slanted guide rail (6a) arranged downward from the inside to the outside. The third slider (7) is slidably connected to the slanted guide rail (6a), and the side of the third slider (7) is slidably connected to the first slider (5) along the vertical direction. This three-stage linkage demolding mechanism includes a second slanted guide post (4) fixed to the fixed mold (2) and inclined in the same direction as the first slanted guide post (3). The first slider (5) has a first slanted hole (5a) opened vertically and with a strip-shaped cross-section. The second slider ( 6) has a second oblique hole (6b) that is vertically opened and has an elliptical cross-section. The vertical length of the second oblique hole (6b) is less than the vertical length of the first oblique hole (5a). The first oblique guide post (3) and the second oblique guide post (4) are arranged side by side and respectively inserted into the first oblique hole (5a) and the second oblique hole (6b). When the mold is opened, the second oblique guide post (4) moves the second slider (6) so that the second slider (6) drives the third slider (7) to move downward relative to the first slider (5) along the oblique guide rail (6a); and when the second slider (6) disengages from the second oblique guide post (4), the first oblique guide post (3) moves the first slider (5).

2. The three-stage linkage demolding mechanism for a mold according to claim 1, characterized in that, The fixed mold (2) is also fixedly connected to the first locking module (8). The upper end of the first inclined guide post (3) is inserted into the first locking module (8). The inner side of the first locking module (8) has a vertically arranged positioning surface (8a). The outer end face of the first slider (5) abuts against the positioning surface (8a). When the second slider (6) disengages from the second inclined guide post (4), the first slider (5) disengages from the positioning surface (8a).

3. The three-stage linkage demolding mechanism for a mold according to claim 2, characterized in that, The fixed mold (2) is also fixedly connected to a second locking module (9). The upper end of the second inclined guide post (4) is inserted into the second locking module (9). When the mold is in the mold-closed state, the lower surface of the second locking module (9) abuts against the upper surface of the second slider (6).

4. A three-stage linkage demolding mechanism for a mold according to claim 1, 2, or 3, characterized in that, The first slider (5) is equipped with a first limiter (10), which has a first limit tooth (10a). The bottom surface of the second slider (6) is provided with two first limit grooves (6c) spaced apart, and the first limit tooth (10a) is located in one of the first limit grooves (6c).

5. The three-stage linkage demolding mechanism for a mold according to claim 4, characterized in that, The moving mold (1) is equipped with a second limiter (11), the moving mold (1) has a mounting groove (1a), the second limiter (11) includes a spring (11a) vertically installed in the mounting groove (1a) and a telescopic block (11b) connected to the top of the spring (11a), the bottom surface of the first slider (5) is provided with two second limit grooves (5b) spaced apart, and the top of the telescopic block (11b) is embedded in one of the second limit grooves (5b).

6. A three-stage linkage demolding mechanism for a mold according to claim 1, 2, or 3, characterized in that, The first slider (5) has a recessed groove (5c) on its side. The second slider (6) and the third slider (7) are arranged in the groove (5c) from bottom to top. The groove (5c) has vertically opened grooves (5d) on the two side walls near the front end of the first slider (5). The third slider (7) has lateral protrusions (7b) on both sides corresponding to the grooves (5d) on the same side. The lateral protrusions (7b) are slidably inserted into the corresponding grooves (5d). The forming teeth (7a) are located at the front end of the third slider (7) and extend upward from the first slider (5).

7. The three-stage linkage demolding mechanism for a mold according to claim 6, characterized in that, The front end of the second slider (6) has an inclined surface (6d) that slopes downward from the inside to the outside. The inclined guide rail (6a) is located on the inclined surface (6d). The bottom of the third slider (7) is provided with a dovetail groove (7c). The inclined guide rail (6a) and the dovetail groove (7c) are slidably connected. The bottom surface of the third slider (7) is close to the inclined surface (6d) of the second slider (6).

8. The three-stage linkage demolding mechanism for a mold according to claim 7, characterized in that, The lateral protrusion (7b) on the third slider (7) extends downward to the outside of the side of the second slider (6) and abuts against the corresponding side of the second slider (6).

9. The three-stage linkage demolding mechanism for a mold according to claim 6, characterized in that, A first guide rail strip (12) is fixedly connected to the inner wall of the groove (5c). A first slide rail (13) is formed between the first guide rail strip (12) and the bottom surface of the groove (5c). The side of the second slider (6) is slidably connected to the first slide rail (13).

10. The three-stage linkage demolding mechanism for a mold according to claim 9, characterized in that, The moving mold (1) is fixedly connected to a second guide rail pressure strip (14) and a wear-resistant plate (15). The wear-resistant plate (15) has a clearance hole (15a) for the first inclined guide post (3) to pass through. A second slide rail (16) is formed between the second guide rail pressure strip (14) and the wear-resistant plate (15). The side of the first slider (5) is slidably connected to the second slide rail (16).

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