A pulp molded article demolding device

Abstract

The utility model discloses a kind of paper pulp molded product demolding devices, including mould base, the upper end of mould base is equipped with mould top seat, the upper end of mould base is installed with molded product lower template, the lower end of mould top seat is installed with molded product upper template, and product lower mould groove is opened in the upper end of molded product lower template;The inside of the product lower mould groove is equipped with demolding plate, and the outer wall of molded product lower template is located at product lower mould groove and is opened with demolding guide groove, the inside of the demolding guide groove is installed with demolding assembly, and the demolding assembly includes demolding horizontal cylinder installed in the inside of demolding guide groove and demolding vertical cylinder installed at the bottom end of product lower mould groove;The device avoids the local stress concentration problem of traditional rigid ejection, effectively reduces the risk of product deformation, cracking, significantly improves the yield, and the spring outside the telescopic rod can provide a buffering effect, and the ejection force can be automatically adjusted according to the hardness of the product during ejection, further protecting the fragile paper pulp product.

Description

Technical Field

[0001] This utility model relates to the field of demolding device technology, specifically a demolding device for pulp molded products. Background Technology

[0002] Pulp molded products are widely used in food packaging, electronic cushioning packaging, and disposable tableware due to their biodegradable and environmentally friendly properties. In their production process, the demolding process is a crucial step determining product quality and production efficiency—the molded pulp product must be smoothly removed from the mold cavity to avoid deformation, damage, or residue. Traditional demolding methods often employ rigid ejector pins or flat ejection mechanisms, with a fixed, rigid connection between the ejector pin and the product. For products with complex shapes (such as those with grooves or corners), the force is concentrated in a localized area during ejection, easily leading to edge cracking, surface dents, or overall deformation, resulting in a low yield. Therefore, new technical solutions are needed to address this issue. Utility Model Content

[0003] The purpose of this invention is to provide a demolding device for pulp molded products to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a demolding device for molded pulp products, comprising a mold base, a mold top seat mounted on the upper end of the mold base, a lower molded product template mounted on the upper end of the mold base, an upper molded product template mounted on the lower end of the mold top seat, and a lower mold groove for the product opened on the upper end of the lower molded product template; a demolding template is mounted inside the lower mold groove, and a demolding guide groove is opened on the outer wall of the lower molded product template at the lower mold groove; a demolding assembly is installed inside the demolding guide groove, the demolding assembly comprising a demolding horizontal cylinder installed inside the demolding guide groove and a demolding vertical cylinder installed at the bottom end of the lower mold groove; a demolding horizontal rod is inserted inside the demolding horizontal cylinder, and a demolding vertical rod is installed inside the demolding vertical cylinder; an inclined surface is opened at the bottom end of the demolding vertical rod, the end of the demolding horizontal rod contacts the inclined surface, and an ejection mechanism is installed at the top end of the demolding vertical rod; the demolding template is connected to the ejection mechanism.

[0005] As a preferred embodiment of the demolding device for pulp molded products according to this utility model, the ejection mechanism includes a fixed plate installed at the top of the demolding vertical rod, a telescopic rod vertically installed at the top of the fixed plate, a universal seat installed at the top of the telescopic rod, a universal cavity installed inside the universal seat, a universal ball installed inside the universal cavity, the demolding plate is connected to the universal ball, and a spring is fitted on the outside of the telescopic rod between the fixed plate and the universal seat.

[0006] As a preferred demolding device for pulp molded products according to the present invention, the inner wall of the universal cavity is provided with rotating cavities evenly spaced along its axis, and ball bearings are installed inside the rotating cavities, with the ball bearings fitting snugly against the universal ball bearings.

[0007] As a preferred embodiment of the demolding device for pulp molded products according to this utility model, the end of the demolding crossbar extends to the outside and is equipped with a drive plate.

[0008] As a preferred embodiment of the demolding device for pulp molded products of this utility model, the bottom end of the upper mold plate of the molded product is provided with an upper mold groove, the interior of the upper mold groove is provided with an injection port, the top end of the mold top seat is provided with an injection port, and the injection port and the injection port are connected.

[0009] As a preferred embodiment of the present invention, a demolding device for pulp molded products has an exhaust port on the outer wall of the template on the molded product.

[0010] As a preferred embodiment of the demolding device for pulp molded products of this utility model, insert rods are installed at the four corners of the bottom end of the upper template of the molded product, and slots are opened at the four corners of the top end of the lower template of the molded product, with the insert rods inserted into the slots.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the demolding device for pulp molded products has a reasonable structural design; The combination of "universal seat + universal ball + rotating cavity ball" in the ejection mechanism allows the ejector plate to adapt to the angle and shape of the bottom surface of the product, achieving uniform force distribution—avoiding the problem of local stress concentration in traditional rigid ejection, effectively reducing the risk of product deformation and cracking, and significantly improving the yield. The spring on the outside of the telescopic rod provides a buffering effect, and can automatically adjust the ejection force according to the hardness of the product during ejection, further protecting the fragile pulp products (especially the semi-finished products after wet molding). The demolding assembly adopts a sloped transmission design of "demolding horizontal bar + demolding vertical bar": by pushing the demolding horizontal bar laterally (with the drive plate at the end for easier operation), the lateral force is converted into the longitudinal ejection force of the demolding vertical bar by the sloped contact. There is no need for complex cylinders or multi-link linkages, the structure is simple, the failure rate is low, the demolding operation time is shortened, and the production line efficiency is improved. Attached Figure Description

[0012] Figure 1 This is a front-view three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention viewed from below; Figure 3 This is a schematic diagram of the demolding component of this utility model; Figure 4 This is a schematic diagram of the ejection mechanism of this utility model.

[0013] In the diagram: 1. Mold base; 2. Mold top seat; 3. Lower mold platen of molded product; 4. Upper mold platen of molded product; 5. Injection port; 6. Lower mold groove of product; 7. Demolding platen; 8. Demolding guide groove; 9. Demolding assembly; 91. Drive plate; 92. Demolding crossbar; 93. Demolding cross cylinder; 94. Demolding vertical cylinder; 10. Upper mold groove of product; 11. Injection port; 12. Insert rod; 13. Slot; 14. Vent; 15. Angled surface; 16. Demolding vertical rod; 17. Ejection mechanism; 18. Telescopic rod; 19. Fixing plate; 20. Spring; 21. Universal seat; 22. Universal ball; 23. Universal cavity; 24. Rotating cavity; 25. Ball bearing. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-4 This utility model provides a technical solution: In this technical solution, a demolding device for molded pulp products includes a mold base 1, a mold top seat 2 mounted on the upper end of the mold base 1, a lower molded product template 3 mounted on the upper end of the mold base 1, an upper molded product template 4 mounted on the lower end of the mold top seat 2, and a lower mold groove 6 formed on the upper end of the lower molded product template 3. A demolding template 7 is mounted inside the lower mold groove 6, and a demolding guide groove 8 is formed on the outer wall of the lower molded product template 3 at the lower mold groove 6. The demolding assembly 9 is installed inside. The demolding assembly 9 includes a demolding horizontal cylinder 93 installed inside the demolding guide groove 8 and a demolding vertical cylinder 94 installed at the bottom of the lower mold groove 6 of the product. A demolding horizontal bar 92 is inserted inside the demolding horizontal cylinder 93. A demolding vertical bar 16 is installed inside the demolding vertical cylinder 94. A slope 15 is opened at the bottom end of the demolding vertical bar 16. The end of the demolding horizontal bar 92 contacts the slope 15. An ejection mechanism 17 is installed at the top of the demolding vertical bar 16. The demolding template 7 is connected to the ejection mechanism 17.

[0016] In this technical solution, the mold base 1 provides fixed support for the entire device, ensuring stability during molding and demolding. The mold top seat 2 is assembled vertically with the mold base 1 and can be opened and closed manually or mechanically. It is a key component for controlling the mold closing and opening actions. The lower mold plate 3 of the molded product is fixed to the upper end of the mold base 1, and its lower mold groove 6 provides bottom molding space for the pulp product. The upper mold plate 4 of the molded product is installed at the lower end of the mold top seat 2, corresponding vertically with the lower mold groove 6 of the product. After mold closing, they together form a complete product cavity, ensuring that the pulp raw material is molded according to the preset shape. The demolding plate 7 is assembled inside the lower mold groove 6 of the product. In the initial state, it is aligned with the lower mold groove 6 of the product. The inner wall of the mold groove 6 fits snugly without affecting the pulp molding; the demolding guide groove 8 is opened on the outer wall of the lower mold plate 3 of the molded product and corresponds to the position of the lower mold groove 6 of the product. It is used to accommodate and limit the demolding component 9, ensuring the precise movement path of the demolding component 9 and avoiding deviation that leads to demolding failure. The demolding horizontal cylinder 93 and the demolding vertical cylinder 94 of the demolding component 9 provide lateral and longitudinal movement channels, respectively. The demolding horizontal bar 92 can slide horizontally in the demolding horizontal cylinder 93, and the demolding vertical bar 16 can slide vertically in the demolding vertical cylinder 94. Through the contact and cooperation between the end of the demolding horizontal bar 92 and the bottom inclined surface 15 of the demolding vertical bar 16, the lateral driving force is converted into the longitudinal ejection force, providing a power basis for the subsequent ejection of the demolding plate 7 and separation of the product.

[0017] In some technical solutions, the ejection mechanism 17 includes a fixed plate 19 installed at the top of the demolding vertical rod 16, a telescopic rod 18 vertically installed at the top of the fixed plate 19, a universal seat 21 installed at the top of the telescopic rod 18, a universal cavity 23 installed inside the universal seat 21, a universal ball 22 installed inside the universal cavity 23, the demolding plate 7 is connected to the universal ball 22, and a spring 20 is fitted on the outside of the telescopic rod 18 between the fixed plate 19 and the universal seat 21.

[0018] In this technical solution, the fixed plate 19 is fixed to the top of the demolding vertical rod 16. Its function is to support the telescopic rod 18, spring 20, and other subsequent components, ensuring that the ejection mechanism 17 moves synchronously with the demolding vertical rod 16 and preventing loose components from causing ejection offset. The telescopic rod 18 is vertically installed on the top of the fixed plate 19 and its length can be adaptively adjusted according to the thickness and shape of the product, avoiding excessive local stress on the product due to a fixed ejection height. The spring 20, which is fitted outside the telescopic rod 18, is located between the fixed plate 19 and the universal seat 21 and can provide a buffering force during ejection—when the demolding plate 7 contacts the product. Spring 20 can absorb excess ejection force through compression, preventing pulp products (especially wet-formed products) from denting or cracking due to rigid impact. The universal cavity 23 inside the universal seat 21 provides rotation space for the universal ball 22, which is directly connected to the ejector plate 7. When the bottom surface of the product has complex shapes such as tilting or unevenness, the universal ball 22 can rotate flexibly in the universal cavity 23, driving the ejector plate 7 to adjust its angle synchronously, so that the ejector plate 7 and the bottom surface of the product are always fully in contact, realizing "surface contact" ejection, replacing the traditional "point contact" or "line contact", and greatly improving the uniformity of ejection force.

[0019] In some technical solutions, the inner wall of the universal cavity 23 is provided with rotating cavities 24 evenly spaced along its axis, and ball bearings 25 are installed inside the rotating cavity 24, with the ball bearings 25 fitting together with the universal ball 22.

[0020] In this technical solution, the rotating cavities 24 are evenly spaced along the inner wall of the universal cavity 23, and the ball bearings 25 in each rotating cavity 24 are in contact with the outer wall of the universal ball 22. When the universal ball 22 is squeezed and rotated by the shape of the product, the ball bearings 25 can roll synchronously with the rotation of the universal ball 22, converting the "sliding friction" between the universal ball 22 and the inner wall of the universal cavity 23 into "rolling friction", which greatly reduces the rotational resistance and avoids the universal ball 22 from getting stuck due to excessive friction, ensuring smooth adjustment of the ejection template 7 angle. The ball bearings 25 also play a radial limiting role for the universal ball 22, preventing the universal ball 22 from coming out of the universal cavity 23 during rotation, and ensuring the structural integrity of the ejection mechanism 17. In addition, the ball bearings 25 can also disperse the pressure on the universal ball 22, reduce the local wear between the universal ball 22 and the universal cavity 23, and extend the service life of the ejection mechanism 17.

[0021] In some technical solutions, the end of the demolding crossbar 92 extends to the outside and is equipped with a drive plate 91.

[0022] In this technical solution, the area of ​​the drive plate 91 is larger than the cross-sectional area of ​​the demolding crossbar 92. When an external force is applied (such as manual pushing or cylinder driving), the force-bearing area can be increased, avoiding the deformation of the end of the demolding crossbar 92 caused by the concentration of external force. At the same time, the planar structure of the drive plate 91 facilitates docking with external drive components (such as cylinder push rods or manual operating levers) without the need for additional processing of adapter interfaces.

[0023] In some technical solutions, the bottom end of the upper mold plate 4 of the molded product is provided with an upper mold groove 10, the interior of the upper mold groove 10 is provided with an injection port 11, the top end of the mold top seat 2 is provided with an injection port 5, and the injection port 5 and the injection port 11 are connected.

[0024] In this technical solution, the injection port 5 at the top of the mold base 2 is the raw material inlet and can be connected to an external pulp conveying pipe; the injection port 11 is opened inside the upper mold groove 10 of the product and is connected to the injection port 5. Its function is to guide the pulp raw material introduced by the injection port 5 to the complete cavity after the upper and lower mold plates are closed, ensuring that the raw material can fill the space formed by the lower mold groove 6 and the upper mold groove 10 of the product, avoiding material shortage in the product due to blockage of the conveying path. A sealing ring can be designed at the connection between the injection port 5 and the injection port 11 to prevent the pulp raw material from leaking from the gap during the conveying process and reduce material waste; at the same time, the inner diameter of the injection port 11 can be adjusted according to the product molding requirements - for example, for thin-walled products, the inner diameter of the injection port 11 can be reduced to decrease the raw material injection speed and prevent air bubbles in the product from being unable to be discharged from the cavity in time.

[0025] In some technical solutions, the outer wall of the template 4 on the molded product is provided with an exhaust port 14.

[0026] In this technical solution, during the process of injecting pulp raw material into the mold cavity, the air inside the mold cavity will be squeezed by the raw material. If it cannot be discharged, it will cause voids to form inside the product and bulges to appear on the surface. The exhaust port 14 is connected to the upper mold groove 10 of the product, which can timely exhaust the air inside the mold cavity to the outside of the device, ensuring that the raw material can tightly fill the mold cavity and improve the density and surface smoothness of the product.

[0027] In some technical solutions, insert rods 12 are installed at the four bottom corners of the upper template 4 of the molded product, and slots 13 are opened at the four top corners of the lower template 3 of the molded product, with the insert rods 12 inserted into the slots 13.

[0028] In this technical solution, the insert rod 12 at the bottom of the upper mold plate 4 of the molded product corresponds one-to-one with the slot 13 at the top of the lower mold plate 3 of the molded product. When the mold is closed, the insert rod 12 is inserted into the slot 13. Through the gap fit between the insert rod 12 and the slot 13 (usually the gap is ≤0.1mm), the horizontal offset of the upper and lower mold plates is limited, ensuring that the upper mold groove 10 and the lower mold groove 6 of the product are completely aligned, avoiding uneven wall thickness and shape deviation of the product due to cavity misalignment.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A demolding device for molded pulp products, comprising a mold base (1), characterized in that, The upper end of the mold base (1) is equipped with a mold top seat (2), the upper end of the mold base (1) is equipped with a lower mold template (3), the lower end of the mold top seat (2) is equipped with an upper mold template (4), and the upper end of the lower mold template (3) is provided with a lower mold groove (6); a demolding template (7) is installed inside the lower mold groove (6), and a demolding guide groove (8) is provided on the outer wall of the lower mold template (3) at the lower mold groove (6). A demolding assembly (9) is installed inside the demolding guide groove (8). (9) Includes a demolding horizontal cylinder (93) installed inside the demolding guide groove (8) and a demolding vertical cylinder (94) installed at the bottom of the lower mold groove (6) of the product. A demolding horizontal bar (92) is inserted inside the demolding horizontal cylinder (93). A demolding vertical bar (16) is installed inside the demolding vertical cylinder (94). An inclined surface (15) is opened at the bottom end of the demolding vertical bar (16). The end of the demolding horizontal bar (92) is in contact with the inclined surface (15). An ejection mechanism (17) is installed at the top end of the demolding vertical bar (16). The demolding template (7) is connected to the ejection mechanism (17).

2. The demolding device for molded pulp products according to claim 1, characterized in that, The ejection mechanism (17) includes a fixed plate (19) installed at the top of the demolding vertical rod (16), a telescopic rod (18) is vertically installed at the top of the fixed plate (19), a universal seat (21) is installed at the top of the telescopic rod (18), a universal cavity (23) is installed inside the universal seat (21), a universal ball (22) is installed inside the universal cavity (23), the demolding plate (7) is connected to the universal ball (22), and a spring (20) is fitted on the outside of the telescopic rod (18) between the fixed plate (19) and the universal seat (21).

3. The demolding device for pulp molded products according to claim 2, characterized in that, The inner wall of the universal cavity (23) is provided with rotating cavities (24) evenly spaced along its axis. The rotating cavities (24) are equipped with ball bearings (25), which are fitted together with the universal ball (22).

4. The demolding device for pulp molded products according to claim 1, characterized in that, The end of the demolding crossbar (92) extends to the outside and is fitted with a drive plate (91).

5. A demolding device for molded pulp products according to claim 1, characterized in that, The bottom end of the upper mold plate (4) of the molded product is provided with an upper mold groove (10), the interior of the upper mold groove (10) is provided with an injection port (11), the top end of the mold top seat (2) is provided with an injection port (5), and the injection port (5) and the injection port (11) are connected.

6. The demolding device for pulp molded products according to claim 1, characterized in that, The outer wall of the template (4) of the molded product is provided with an exhaust port (14).

7. A demolding device for molded pulp products according to claim 1, characterized in that, The upper template (4) of the molded product is equipped with insert rods (12) at the bottom four corners, and the lower template (3) of the molded product is provided with slots (13) at the top four corners, and the insert rods (12) are inserted into the slots (13).

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