A demolding mechanism

Abstract

The utility model provides a kind of demolding forming mechanism, including inclined guide pillar, vertical pull rod, groove wall forming insert, pull block and reverse buckle forming insert. Inclined guide pillar is fixedly connected with upper die fixed die;Vertical pull rod end is equipped with inclined guide rod;Groove wall forming insert is slidably arranged in lower movable die, and its insertion hole inner wall is equipped with inclined guide wall;Pull block is slidably connected with groove wall forming insert, and is equipped with the through-hole for the inclined guide pillar to pass through;Reverse buckle forming insert is connected with pull block by connecting portion. When clamping, inclined guide rod drives each insert to move as a whole first, and then inclined guide pillar drives reverse buckle forming insert to move alone;The sequence is reversed when demolding. The mechanism effectively avoids motion interference, solves the problem of traditional inclined top easy to jam, wear and tear, improves demolding precision and product yield, compact structure, suitable for high-precision injection mold.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically, to a demolding and molding mechanism. Background Technology

[0002] As a key process equipment for mass production of plastic products, the design quality of plastic injection molds directly affects the molding efficiency and precision of the products. During injection molding, it is common to encounter situations where plastic products have undercut structures inside, which create obstacles in the mold opening direction, preventing the product from being smoothly demolded through conventional ejection mechanisms. Traditional solutions for such structures often rely on angled ejection mechanisms, which simultaneously generate lateral parting motion during ejection to avoid the undercut area.

[0003] However, the inclined ejector structure has certain limitations in practical applications: its complex structure and large space occupation place high demands on mold layout and ejection stroke design; when undercuts are set on the processing groove wall, the inclined ejector is prone to jamming, wear, or even breakage, which not only reduces mold life but may also cause surface scratches, deformation, or cracking of the product during ejection. In addition, the fit clearance and motion error between the inclined ejector components also affect demolding stability, especially for products with high precision or strict appearance requirements, where insufficient demolding reliability has become a key factor affecting product yield. Utility Model Content

[0004] This application mainly addresses the problems of jamming and wear that easily occur when traditional inclined ejector mechanisms are used to process undercuts on the groove wall. To overcome the above-mentioned defects of the prior art, this application provides a demolding and forming mechanism.

[0005] This application provides a demolding and molding mechanism, including:

[0006] The inclined guide post is fixedly connected to the upper fixed mold of the mold;

[0007] A vertical tie rod is fixedly connected to the upper fixed mold of the mold. The end of the vertical tie rod away from the upper fixed mold is provided with an inclined guide rod. The height of the inclined guide rod is lower than the height of the inclined guide post.

[0008] A groove wall forming insert is slidably connected to the lower moving mold of the mold along the groove wall forming direction. The groove wall forming insert is provided with an insertion hole for inserting a vertical tie rod. The hole wall is provided with an inclined guide wall that matches the inclined guide rod. When the inclined guide rod and the inclined guide wall slide and engage with each other, the vertical tie rod drives the groove wall forming insert to reciprocate.

[0009] A pull block is slidably connected to a groove wall forming insert. The moving direction of the pull block is the same as that of the groove wall forming insert. The pull block is provided with a through hole through which the inclined guide post is inserted and slidably. When the inclined guide post and the through hole slide together, the inclined guide post drives the pull block to move back and forth.

[0010] An undercut insert is slidably disposed on a groove wall forming insert along the undercutting direction. The undercut insert is connected to a pull block via a connecting part. When the pull block is moved by the inclined guide post, the pull block drives the undercut insert to reciprocate.

[0011] Specifically, when the moving mold closes upwards, the inclined guide rod first moves the groove wall forming insert, the pull block, and the undercut forming insert together towards the groove wall forming direction. Then, the inclined guide post moves the undercut forming insert towards the undercut forming direction via the pull block. When the moving mold demolds downwards, the inclined guide post first moves the undercut forming insert away from the undercut forming direction via the pull block. Then, the inclined guide rod moves the groove wall forming insert, the pull block, and the undercut forming insert together away from the groove wall forming direction.

[0012] Compared with existing technologies, the demolding mechanism proposed in this application has the following advantages: Through the coordinated structure of "slanted guide pillars, pull blocks, and undercut molding inserts" and "vertical pull rods, slanted guide rods, and groove wall molding inserts," it achieves staged driving (when closing the mold, the inserts move as a whole first, then the undercut inserts are driven individually; when demolding, the undercut inserts move in the opposite direction first, then the whole assembly retracts), avoiding interference between the undercut and groove wall molding structures during movement. This completely eliminates the defects of traditional slanted ejector mechanisms in handling products with "groove walls with undercuts," such as jamming, wear, and complex structures. The staged movement precisely controls the undercut molding and release process, reducing the clearance and movement error between components, avoiding product breakage and appearance defects caused by unstable demolding, and significantly improving the yield of high-precision products. It eliminates the need for complex slanted ejector components and additional ejection stroke design; the orderly cooperation of each component adapts to a compact mold layout, reducing the overall mold volume and design complexity.

[0013] In one possible implementation, the connecting part includes a slidably connected inclined guide strip and an inclined guide groove. The inclined guide strip is fixed to the pull block, and the inclined guide groove is formed on the undercut insert. Compared with the prior art, the sliding connection structure of the inclined guide strip and the inclined guide groove accurately converts the linear movement of the pull block into the directional movement of the undercut insert, avoiding relative wobbling or misalignment between the pull block and the undercut insert, and ensuring the consistency of the undercutting and disengagement actions.

[0014] In one possible implementation, the cross-sections of the inclined guide strip and the inclined guide groove are mutually matching dovetail or T-shaped structures. Compared with the prior art, this cross-sectional structure has anti-detachment characteristics, which can prevent the inclined guide strip from falling out of the inclined guide groove during sliding, avoid loss of control of the undercut molding insert movement due to connection failure, and ensure the safety of mold operation.

[0015] In one possible implementation, the lower moving mold is provided with a first positioning structure for positioning the groove wall forming insert. The first positioning structure includes a first receiving groove formed on the lower moving mold, a first positioning post and a first spring disposed within the first receiving groove. The first positioning post is slidably disposed vertically within the first receiving groove. The groove wall forming insert is provided with two first positioning grooves that match the first positioning post. The two first positioning grooves are spaced apart along the moving direction of the groove wall forming insert. The first spring is used to drive the first positioning post to extend out of the first receiving groove. Compared with the prior art, the combination of the first positioning post, the first spring, and the double first positioning grooves stably locks the groove wall forming insert at the "groove wall forming limit position" and "away from the groove wall forming limit position," preventing it from shifting when not in operation.

[0016] In one possible implementation, both the first positioning groove and the top of the first positioning post are arc-shaped structures. Compared with the prior art, the arc transition can guide the first positioning post to smoothly slide into or out of the first positioning groove, improving the response speed and smoothness of the positioning action.

[0017] In one possible implementation, the groove wall forming insert is provided with a second positioning structure for positioning the pull block. The second positioning structure includes a second receiving groove formed on the groove wall forming insert, a second positioning post and a second spring disposed within the second receiving groove. The second positioning post is slidably disposed vertically within the second receiving groove. The pull block is provided with two second positioning grooves that match the second positioning post. The two second positioning grooves are spaced apart along the moving direction of the pull block. The second spring is used to drive the second positioning post to extend out of the second receiving groove. Compared with the prior art, the combination of the second positioning post, the second spring, and the double second positioning grooves stably locks the pull block at the two extreme positions of the inverted forming insert, preventing the pull block from spontaneously shifting when the inclined guide post is not in action, and ensuring the alignment accuracy of the inclined guide post when inserted into the through hole.

[0018] In one possible implementation, both the second positioning groove and the top of the second positioning post are arc-shaped structures. Compared with the prior art, the arc transition makes it smoother for the second positioning post to enter and exit the second positioning groove, improving the response speed and smoothness of the positioning action; at the same time, it facilitates the movement of the pull block during operation.

[0019] In one possible implementation, the bottom end of the inclined guide rod is provided with an inclined guide angle to guide the inclined guide rod into the insertion hole of the groove wall forming insert. Compared with the prior art, the inclined guide angle can guide the inclined guide rod to automatically correct its position in the early stage of mold closing, and quickly insert it into the insertion hole of the groove wall forming insert, eliminating the need for precise manual alignment, reducing the difficulty of mold assembly and debugging, and improving mold closing efficiency.

[0020] In one possible implementation, the insertion end of the inclined guide post is provided with a guide radius to guide the inclined guide post into the through hole of the pull block. Compared with the prior art, the guide radius can guide the inclined guide post to smoothly insert into the through hole of the pull block, avoiding rigid friction or jamming between the insertion end of the inclined guide post and the edge of the through hole, ensuring that the sliding fit between the inclined guide post and the pull block is always smooth, and reducing the resistance of the mold movement. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this application;

[0022] Figure 2 This is a partial structural diagram of this application;

[0023] Figure 3 for Figure 2 Cross-sectional view;

[0024] Figure 4 This is a schematic diagram of the structure of the groove wall forming insert;

[0025] Figure 5 This is a schematic diagram of the pull block structure;

[0026] Figure 6 This is a schematic diagram of the structure of the inverted molding insert;

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Angled guide post; 2. Vertical tie rod; 3. Angled guide rod; 4. Groove wall forming insert; 41. Insert hole; 42. Angled guide wall; 43. First positioning groove; 5. Pull block; 51. Through hole; 52. Angled sliding guide bar; 53. Second positioning groove; 6. Inverted forming insert; 61. Angled sliding guide groove; 7. First positioning structure; 71. First positioning post; 72. First spring; 8. Second positioning structure; 81. Second positioning post; 82. Second spring; 10. Upper fixed mold; 20. Lower moving mold. Detailed Implementation

[0029] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0030] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0031] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] See Figures 1 to 6 This application discloses a demolding and forming mechanism, including: an inclined guide post 1, a vertical tie rod 2, an inclined guide rod 3, a groove wall forming insert 4, a pull block 5, and an inverted forming insert 6.

[0034] The inclined guide post 1 is fixedly connected to the lower surface of the upper fixed mold 10, and the connection position is located directly above the pull block 5 of the upper fixed mold 10. The inclined guide post 1 is made of high-strength alloy steel and is cylindrical in shape; its axis is inclined at an angle to the mold closing direction, and the specific angle is adapted according to the undercut forming depth.

[0035] The vertical tie rod 2 is a cuboid structure (material same as the inclined guide post 1), and its length is determined according to the mold closing height. Its top end is fixedly connected to the lower surface of the upper fixed mold 10. This fixing point is spaced apart from the fixing point of the inclined guide post 1 to avoid mutual interference. The inclined guide rod 3 is integrally formed at the bottom end of the vertical tie rod 2, and the height of the inclined guide rod 3 is lower than the height of the inclined guide post 1.

[0036] The groove wall forming insert 4, through a slider at its bottom, engages with a corresponding groove machined on the lower moving mold 20, achieving precise sliding connection along the groove wall forming direction (left-right direction). The groove wall forming insert 4 has an insertion hole 41, a square hole penetrating the body of the insert 4, used to accommodate the vertical tie rod 2. The wall of the insertion hole 41 has an inclined guide wall 42, a partially inclined surface machined on the inner wall of the insertion hole 41, whose inclination angle is completely consistent with the inclination angle of the inclined guide rod 3, used to form a sliding engagement with the inclined guide rod 3, driving the groove wall forming insert 4 to move.

[0037] The pull block 5, through the guide rail structure at its bottom, cooperates with the guide groove machined on the upper surface of the groove wall forming insert 4, achieving a sliding connection with the groove wall forming insert 4 in the same direction of movement. The pull block 5 is provided with a through hole 51, which is an elongated hole that passes through the pull block 5. The hole wall matches the surface of the inclined guide post 1, allowing the inclined guide post 1 to slide smoothly within it and drive the pull block 5 to move.

[0038] The undercut insert 6 is inserted into a corresponding groove on the groove wall insert 4 via a slider on its side, thus achieving its sliding setting along the undercutting direction (the front-to-back direction). The undercut insert 6 is connected to the pull block 5 through a connecting part, converting the movement of the pull block 5 into the movement of the undercut insert 6.

[0039] Mold closing process: The lower moving mold 20 moves upward. First, the inclined guide rod 3 on the vertical tie rod 2 is inserted into the insertion hole 41 of the groove wall forming insert 4. The inclined guide rod 3 and the inclined guide wall 42 are slidably engaged. Since the height of the inclined guide rod 3 is lower than that of the inclined guide post 1, the inclined guide post 1 has not yet been inserted into the through hole 51 of the pull block 5. The lateral force of the inclined guide rod 3 drives the groove wall forming insert 4 to move along the groove wall forming direction. At the same time, the pull block 5 and the undercut forming insert 6 (which moves synchronously with the groove wall forming insert 4) move together. When the lower moving mold 20 continues to move upward until the inclined guide post 1 is inserted into the through hole 51 of the pull block 5, the inclined guide post 1 and the through hole 51 are slidably engaged. Its lateral force drives the pull block 5 to move relative to the groove wall forming insert 4. Then, through the connecting part, the undercut forming insert 6 is driven to move along the undercut forming direction until the mold is closed in place, completing the forming of the groove wall and the undercut.

[0040] Demolding process: The lower moving mold 20 moves downward. First, the inclined guide post 1 slides in the through hole 51. Its sliding cooperation with the pull block 5 through hole 51 generates a lateral force, which drives the pull block 5 to move in the opposite direction, thereby driving the undercut molding insert 6 to disengage from the undercut of the product. When the lower moving mold 20 continues to move downward until the inclined guide rod 3 begins to slide with the inclined guide wall 42 of the insertion hole 41, the undercut molding insert 6 completely disengages from the undercut. At this time, the lateral force of the inclined guide rod 3 drives the groove wall molding insert 4, the pull block 5, and the undercut molding insert 6 to move as a whole away from the groove wall molding direction until they are completely demolded.

[0041] In this embodiment, there are two inverted molded inserts 6, located at the front and rear of the pull block 5, respectively. The connecting part includes two pairs of slidably connected oblique guide strips 52 and oblique guide grooves 61. The oblique guide strips 52 are two strip-shaped protrusions machined on the front and rear sides of the pull block 5, forming a V-shaped inclined angle; the oblique guide grooves 61 are corresponding strip-shaped grooves machined on the body of the inverted molded insert 6, and their groove shape matches the cross-section of the oblique guide strips 52. The cross-section of the oblique guide strips 52 is machined into a dovetail structure, that is, with inward inclination angles on both sides; correspondingly, the cross-section of the oblique guide grooves 61 is also machined into a dovetail-shaped groove that perfectly matches it. As an equivalent alternative, the cross-section of the mutually cooperating protrusions and grooves can also adopt a T-shaped structure. Regardless of whether a dovetail or T-shaped structure is used, it can effectively prevent the oblique guide strips 52 from coming out of the oblique guide grooves 61 during sliding, ensuring the stability and reliability of the connecting part during the transmission process. That is, when the pull block 5 moves in the left and right direction under the drive of the inclined guide post 1, the inclined sliding guide 52 moves synchronously with the pull block 5. Since the inclined sliding guide 52 and the inclined sliding guide groove 61 are inclined, the sliding of the inclined sliding guide 52 in the inclined sliding guide groove 61 will convert the movement of the pull block 5 into the movement of the undercut molding insert 6 along the undercut molding direction, so as to realize the movement transmission between the pull block 5 and the undercut molding insert 6.

[0042] In this embodiment, the lower moving mold 20 is provided with a first positioning structure 7, which includes a first receiving groove and a first positioning pin 71 and a first spring 72 disposed within the first receiving groove. The first receiving groove is formed on the lower moving mold 20; the first positioning pin 71 is a cylindrical pin with a diameter slightly smaller than the diameter of the first receiving groove, allowing it to slide freely vertically within the receiving groove; the first spring 72 is placed at the bottom of the first receiving groove, with its top end abutting against the bottom end of the first positioning pin 71, providing a continuous upward elastic ejection force for the first positioning pin 71. At the bottom of the groove wall forming insert 4, two first positioning grooves 43 are machined at intervals along its moving direction. When the groove wall forming insert 4 slides to a position away from or into the cavity, under the action of the first spring 72, the top end of the first positioning pin 71 will precisely engage in the corresponding first positioning groove 43, preventing it from moving accidentally in a non-driven state.

[0043] In this embodiment, the top end of the first positioning post 71 is machined into an arc-shaped structure; correspondingly, the first positioning groove 43 is also machined into an arc-shaped concave surface that matches it. This arc-shaped contact design can significantly reduce the frictional resistance and impact when the first positioning post 71 slides into or out of the first positioning groove 43, making the movement of the first positioning post 71 smoother, while facilitating the movement of the groove wall forming insert 4 under the drive state of the inclined guide rod 3.

[0044] In this embodiment, the groove wall forming insert 4 is provided with a second positioning structure 8, which includes a second receiving groove and a second positioning post 81 and a second spring 82 disposed within the second receiving groove. The second receiving groove is formed in the groove wall forming insert 4; the second positioning post 81 is also a cylindrical pin, placed in the second receiving groove and can slide vertically; the second spring 82 is placed at the bottom of the second receiving groove and continuously pushes the second positioning post 81 upward. At the bottom of the pull block 5, two second positioning grooves 53 are provided at intervals along its moving direction. When the pull block 5 slides relative to the groove wall forming insert 4 to the inverted insert retracted position or the inverted insert extended position, the second positioning post 81 is engaged with the corresponding second positioning groove 53 under the action of the spring force, realizing the precise positioning of the pull block 5 and preventing it from moving accidentally in the non-drive state.

[0045] In this embodiment, the top of the second positioning post 81 and the second positioning groove 53 are both machined into arc-shaped structures. This arc-shaped contact design can significantly reduce the frictional resistance and impact when the second positioning post 81 slides into or out of the second positioning groove 53, making the movement of the second positioning post 81 smoother, and at the same time facilitating the movement of the pull block 5 when driven by the inclined guide post 1.

[0046] In this embodiment, a beveled guide angle is machined at the lowest end of the beveled guide rod 3 (i.e., the end that is first inserted into the insertion hole 41). The function of this beveled guide angle is that, in the early stage of mold closing, even if there is a slight alignment error between the vertical tie rod 2 and the insertion hole 41, the beveled guide angle can preferentially contact and guide the beveled guide rod 3 to smoothly slide into the insertion hole 41, avoiding rigid collision, protecting the parts, and ensuring smooth start-up of the mechanism.

[0047] In this embodiment, a guide rounded corner is machined at the lowest end (insertion end) of the inclined guide post 1. This rounded corner structure provides a smooth transition when the inclined guide post 1 begins to be inserted into the through hole 51 of the pull block 5, effectively guiding the inclined guide post 1 to accurately enter the through hole 51, preventing the edge of the through hole 51 from being scratched, stuck or damaged due to sharp edges, and ensuring the smoothness of the transmission process.

[0048] A demolding mechanism offers several advantages, including phased drive control achieved through the coordinated operation of the inclined guide post 1, vertical tie rod 2, groove wall forming insert 4, pull block 5, and undercut forming insert 6. During mold closing, the inclined guide rod 3 first moves each insert as a whole, followed by the inclined guide post 1 driving the undercut forming insert 6 individually; the sequence is reversed during demolding. This structure effectively avoids interference between the undercut and groove wall forming structures during movement, solving the problems of jamming, wear, and complex structure inherent in traditional inclined ejector mechanisms. Phased movement improves the accuracy of undercut forming and disengagement, reduces fitting clearance and movement errors, and significantly improves product yield and mold life. The mechanism has a compact structure, eliminating the need for complex inclined ejector components, reducing mold design difficulty and overall volume, and is suitable for high-precision injection molding.

[0049] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0050] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A demolding and molding mechanism, characterized in that, include: The inclined guide post is fixedly connected to the upper fixed mold of the mold; A vertical tie rod is fixedly connected to the upper fixed mold of the mold. The end of the vertical tie rod away from the upper fixed mold is provided with an inclined guide rod. The height of the inclined guide rod is lower than the height of the inclined guide post. A groove wall forming insert is slidably connected to the lower moving mold of the mold along the groove wall forming direction. The groove wall forming insert is provided with an insertion hole for inserting a vertical tie rod. The hole wall is provided with an inclined guide wall that matches the inclined guide rod. When the inclined guide rod and the inclined guide wall slide and engage with each other, the vertical tie rod drives the groove wall forming insert to reciprocate. A pull block is slidably connected to a groove wall forming insert. The moving direction of the pull block is the same as that of the groove wall forming insert. The pull block is provided with a through hole through which the inclined guide post is inserted and slidably. When the inclined guide post and the through hole slide together, the inclined guide post drives the pull block to move back and forth. An undercut insert is slidably disposed on a groove wall forming insert along the undercutting direction. The undercut insert is connected to a pull block via a connecting part. When the pull block is moved by the inclined guide post, the pull block drives the undercut insert to reciprocate. Specifically, when the moving mold closes upwards, the inclined guide rod first moves the groove wall forming insert, the pull block, and the undercut forming insert together towards the groove wall forming direction. Then, the inclined guide post moves the undercut forming insert towards the undercut forming direction via the pull block. When the moving mold demolds downwards, the inclined guide post first moves the undercut forming insert away from the undercut forming direction via the pull block. Then, the inclined guide rod moves the groove wall forming insert, the pull block, and the undercut forming insert together away from the groove wall forming direction.

2. The demolding and molding mechanism according to claim 1, characterized in that, The connecting part includes a sliding guide bar and a sliding guide groove that are slidably connected. The sliding guide bar is fixed on the pull block, and the sliding guide groove is formed on the inverted molded insert.

3. The demolding and molding mechanism according to claim 2, characterized in that, The cross-sections of the inclined guide bar and the inclined guide groove are mutually matched dovetail or T-shaped structures.

4. The demolding and molding mechanism according to claim 1, characterized in that, The lower moving mold is provided with a first positioning structure for positioning the groove wall forming insert. The first positioning structure includes a first receiving groove formed on the lower moving mold and a first positioning post and a first spring disposed in the first receiving groove. The first positioning post is slidably disposed in the first receiving groove along the vertical direction. The groove wall forming insert is provided with two first positioning grooves that match the first positioning post. The two first positioning grooves are spaced apart along the moving direction of the groove wall forming insert. The first spring is used to drive the first positioning post to extend out of the first receiving groove.

5. The demolding and molding mechanism according to claim 4, characterized in that, Both the top of the first positioning groove and the top of the first positioning post are arc-shaped structures.

6. The demolding and molding mechanism according to claim 1, characterized in that, The groove wall forming insert is provided with a second positioning structure for positioning the pull block. The second positioning structure includes a second receiving groove formed on the groove wall forming insert and a second positioning post and a second spring disposed in the second receiving groove. The second positioning post is slidably disposed in the second receiving groove along the vertical direction. The pull block is provided with two second positioning grooves that match the second positioning post. The two second positioning grooves are spaced apart along the moving direction of the pull block. The second spring is used to drive the second positioning post to extend out of the second receiving groove.

7. The demolding and molding mechanism according to claim 6, characterized in that, Both the second positioning groove and the top of the second positioning post have an arc-shaped structure.

8. The demolding and molding mechanism according to claim 1, characterized in that, The bottom end of the inclined guide rod is provided with an inclined guide angle, which is used to guide the inclined guide rod to be inserted into the insertion hole of the groove wall forming insert.

9. The demolding and molding mechanism according to claim 1, characterized in that, The insertion end of the inclined guide post is provided with a guide radius to guide the inclined guide post into the through hole of the pull block.

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