Magnetic fixing structure of roto-molding mold insert

Abstract

The application discloses a magnetic attraction fixing structure of a roving mould insert, relates to the technical field of roving moulds, and comprises a mould body, an insert, a magnet for magnetically attracting and fixing the insert on the mould body, and a ferromagnetic attraction piece, wherein one end of the insert close to the magnet is provided with a mounting hole, the ferromagnetic attraction piece is detachably mounted in the mounting hole of the insert, the magnet is detachably mounted on the mould body, and the magnet directly contacts the ferromagnetic attraction piece after the insert is mounted. The application facilitates the mounting and dismounting of the insert, the ferromagnetic attraction piece is mounted on the insert, so that inserts made of various materials can be mounted on the roving mould through magnetic attraction, and the magnet directly contacts the ferromagnetic attraction piece, thereby enhancing the magnetic attraction force of the magnet on the ferromagnetic attraction piece and improving the mounting stability of the insert.

Description

Technical Field

[0001] This application relates to the technical field of rotational molding dies, and in particular to magnetic fixing structures for rotational molding die inserts. Background Technology

[0002] Rotational molding, also known as rotational molding, is a process for producing hollow plastic products. It can be used to produce plastic products of various sizes and shapes, open or closed. When assembling rotationally molded products with other plastic or metal products, inserts are often used for connection and fixation. Therefore, rotationally molded products generally require various pre-embedded inserts. Traditionally, bolts and other fasteners are used to pre-fix the inserts to the inner wall of the rotational molding mold, which are then embedded into the product during the molding process. However, after the mold is formed, unscrewing and removing the bolts takes a significant amount of time, greatly affecting the efficiency of the rotational molding process.

[0003] In the related technology, the utility model application with application number CN202120598246.9 discloses a rotational molding mold structure for fixing a pre-embedded insert by magnetic adsorption, including a mold body, a pre-embedded insert, and a magnet for adsorbing and fixing the pre-embedded insert to the mold body; the magnet is fixed in the mold body, and the distance between the magnet and the pre-embedded insert is 2-5mm.

[0004] Regarding the aforementioned technologies, the rotational molding mold structure is designed for ferrous or other magnetic metal embedded inserts. By using magnets installed within the mold, the embedded inserts are magnetically secured, enabling rapid installation and removal, thus reducing operation time. However, this rotational molding mold structure has significant limitations: 1. It can only secure magnetic metal inserts, limiting its application range; 2. The magnetic force generated by the magnet on the insert cannot guarantee that the insert will be firmly held by the magnet during rotational molding. To address these issues, this application proposes a magnetic fixing structure for rotational molding mold inserts. Utility Model Content

[0005] The magnetic fixing structure for the rotational molding mold insert provided in this application adopts the following technical solution:

[0006] The magnetic fixing structure for the rotational molding mold insert includes a mold body, an insert, and a magnet for magnetically fixing the insert to the mold body. It also includes an iron magnetic component. The insert has a mounting hole at one end near the magnet. The iron magnetic component is detachably installed in the mounting hole of the insert. The magnet is detachably installed on the mold body. After the insert is installed, the magnet is in direct contact with the iron magnetic component.

[0007] By adopting the above technical solution and introducing ferrous magnetic components, the insert itself does not need to be magnetic. Inserts of any material can be fixed by magnets simply by installing ferrous magnetic components, thus increasing the range of applications. The ferrous magnetic components, in conjunction with the magnets, allow for independent design of the magnetic material and contact structure, helping to ensure sufficient magnetic attraction between the ferrous magnetic components and the magnets. This prevents the problem of inserts falling off the magnets during rotational molding due to insufficient magnetic attraction caused by the insert material. The direct contact between the magnet and the ferrous magnetic components further enhances the magnetic attraction, allowing the inserts to be stably installed on the mold body. The magnets are detachable; when their magnetism weakens, only the magnet needs to be replaced, without replacing the entire mold, saving production costs.

[0008] Preferably, when the insert is a through-hole insert, the mounting hole extends through the insert; an anti-blocking head is provided on the side of the insert away from the magnet, the anti-blocking head is a rod, and the axis of the anti-blocking head is coaxial with the mounting hole; the anti-blocking head is located inside the mounting hole, and an installation rod is provided at one end of the anti-blocking head near the ferrous magnetic attractor, the axis of the installation rod is perpendicular to the axis of the anti-blocking head, and the installation rod passes through the anti-blocking head and the ferrous magnetic attractor to fix the anti-blocking head and the ferrous magnetic attractor to each other; the other end of the anti-blocking head extends out of the insert and closes the mounting hole.

[0009] By adopting the above technical solution, the mounting hole through the insert forms a through hole on the insert; the anti-clogging head design seals the end of the mounting hole away from the magnet through the rod body, directly preventing plastic from entering the mounting hole, ensuring that the inside of the mounting hole remains clean and preventing blockage; the anti-clogging head is connected by the mounting rod passing horizontally through the iron magnetic attractor, making installation convenient.

[0010] Preferably, it further includes a fixing component, which is installed inside the mold body. The fixing component is a hollow cylindrical connector that penetrates the side wall of the mold body. The magnet is located at the end of the fixing component near the insert. The end of the fixing component away from the insert is provided with a fixing bolt and an abutment ring. The abutment ring is fixed to the fixing component and closes the end opening of the fixing component. The end of the magnet away from the insert is provided with a threaded hole that engages with the threaded bolt. The fixing bolt passes through the abutment ring and is screwed into the threaded hole of the magnet. The nut profile of the fixing bolt is larger than the profile of the center hole of the abutment ring. An elastic element is provided between the abutment ring and the magnet.

[0011] By adopting the above technical solution, the magnet is fixedly installed with an independent fastener, which helps to simplify the structure of the mold body; the magnet is detachably fixed with fixing bolts.

[0012] Preferably, the outer periphery of the fixing member is provided with threads, and a limit strip is fixed to the end of the fixing member near the insert, the limit strip abutting against the mold body; a nut is screwed to the end of the fixing member away from the insert, the nut and the limit strip clamping and fixing the screw to the mold body; a flat washer is clamped and fixed between the nut and the mold body.

[0013] By adopting the above technical solution, the fastener is fixed to the mold body, resulting in a simple structure and convenient installation.

[0014] Preferably, a spring washer is clamped between the fixing bolt and the abutment ring; a spring washer is also fitted on the end of the fixing bolt away from the abutment ring, one end of the elastic element abuts against the head of the fixing bolt, and the other end of the elastic element abuts against the spring washer.

[0015] By adopting the above technical solution, the spring washer between the fixing bolt and the flat washer is used in conjunction with the flat washer. The elastic tension of the spring washer continuously presses against the fixing bolt, effectively preventing the fixing bolt from loosening accidentally during rotational molding. The spring washer, in conjunction with the elastic element, further counteracts the centrifugal force on the magnet during rotational molding, preventing the magnet from shifting and causing a decrease in the magnetic attraction force on the iron magnetic part, which could lead to the insert falling off.

[0016] Preferably, the fixing component includes a fixing plate and a bushing, the bushing is installed through the mold body, and one end of the bushing is fixed to the fixing plate; the fixing plate is provided with fastening screws, and the fixing plate is fixedly installed on the mold body by fastening screws.

[0017] By adopting the above technical solution, the fixing component consists of a fixing plate and a bushing, with the bushing penetrating the mold body and vertically fixed to the fixing plate. This modular structure facilitates installation and disassembly, while also improving the standardization of components.

[0018] Preferably, the magnet is inserted into the bushing, and the magnet is located at the end of the bushing closer to the insert; a screw hole is opened at the end of the magnet away from the insert, and a fixing bolt is provided on the fixing plate, which is screwed into the screw hole of the magnet.

[0019] By adopting the above technical solution, the magnet end is provided with a screw hole, and the fixing bolt passes through the fixing plate and is directly screwed to the magnet, ensuring a tight connection between the magnet and the bushing, and preventing the magnet from loosening and shifting due to centrifugal force during the rotational molding process.

[0020] Preferably, a flat washer and a spring washer are clamped and fixed between the fixing plate and the fixing bolt; a spring washer is clamped and fixed between the fixing plate and the magnet.

[0021] The flat washers and spring washers placed between the fixing plate and the fixing bolts effectively resist the centrifugal force during the rotational molding process and prevent the fixing bolts from loosening accidentally. The spring washers located between the fixing plate and the magnet can absorb the centrifugal force on the magnet, prevent the magnet from shifting, and prevent the magnetic attraction between the magnet and the iron magnetic component from weakening, thereby ensuring that the insert is firmly fixed.

[0022] Preferably, the end of the magnet near the ferrous magnetic attractor has a protrusion, and the end of the ferrous magnetic attractor near the magnet has a groove that matches the protrusion.

[0023] By adopting the above technical solution, the magnetic force of the magnet on the iron magnetic component is improved by matching the protrusion on the magnet with the groove of the iron magnetic component.

[0024] Preferably, the ferrous magnetic attractor has an externally threaded plug, the mounting hole is a threaded hole, and the ferrous magnetic attractor is threadedly engaged with the mounting hole of the insert.

[0025] By adopting the above technical solution, the iron plug is screwed into the threaded hole of the insert without the need for additional fasteners or complex tools, making installation simple and quick. The self-locking characteristic of the threaded fit prevents the iron magnetic component from loosening under centrifugal force, ensuring long-term stability. By designing the iron magnetic component as a threaded iron plug, inserts of any material can be installed with the iron magnetic component simply by machining matching threaded holes, greatly expanding the range of material choices for inserts and overcoming the limitation of traditional magnetic fastening that is only applicable to magnetic materials.

[0026] In summary, this application includes the following beneficial technical effects:

[0027] By incorporating an iron magnetic chuck within the insert and a magnet installed within the fixing component, the insert itself does not need to be magnetic. Inserts of any material can be fixed by the magnet simply by installing the iron magnetic chuck, thus expanding the applicability of this solution. The iron magnetic chuck works in conjunction with the magnet to ensure sufficient magnetic attraction between them, preventing the insert from detaching from the magnet during rotational molding due to insufficient magnetic attraction caused by the insert material. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view (through-hole insert) of the overall structure of Embodiment 1 of this application.

[0029] Figure 2 This is a cross-sectional view of the overall structure of Embodiment 1 of this application (blind hole insert);

[0030] Figure 3 This is a cross-sectional view (through-hole insert) of the overall structure of Embodiment 2 of this application;

[0031] Figure 4This is a cross-sectional view of the overall structure of Embodiment 2 of this application (blind hole insert);

[0032] Figure 5 This is a cross-sectional view (through-hole insert) of the overall structure of Embodiment 3 of this application;

[0033] Figure 6 This is a cross-sectional view of the overall structure of Embodiment 3 of this application (blind hole insert).

[0034] Reference numerals: 1. Mold body; 2. Insert; 21. Mounting hole; 3. Iron magnetic component; 4. Fixing component; 5. Magnet; 51. Protrusion; 6. Limiting strip; 7. Nut; 8. Flat washer; 9. Fixing bolt; 10. Abutment ring; 11. Spring washer; 12. Elastic component; 13. Anti-blocking head; 14. Mounting rod; 15. Fixing plate; 16. Bushing; 17. Fastening screw. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail.

[0036] This application discloses a magnetic fixing structure for rotational molding die inserts.

[0037] This application mainly adopts a scheme of installing iron magnetic components inside the insert and using magnets for magnetic attraction and fixation, which achieves the effect of facilitating the installation and removal of the insert and expanding the application range of the insert. The following is a further detailed description of this application.

[0038] Example 1:

[0039] refer to Figure 1 The magnetic fixing structure of the rotational molding mold insert provided in this embodiment includes a mold body 1, an insert 2, an iron magnetic 3 installed in the insert 2, and a magnet 5 installed in the mold body 1. The magnet 5 is magnetically fixed to the insert 2. The inner wall of the mold body 1 is provided with a mounting hole for installing the magnet 5. The end of the magnet 5 away from the insert 2 is provided with a threaded hole. The magnet 5 is inserted into the mold body 1, and the magnet 5 is detachably installed in the mold body 1 by screwing a fixing bolt 9 through the mold body 1 into the threaded hole of the magnet 5. When installing the insert 2, the magnet 5 is in direct contact with the iron magnetic 3. By introducing the iron magnetic 3, the insert 2 itself does not need to have a magnetic material. The insert 2 of any material can be fixed by the magnet 5 simply by installing the iron magnetic 3, which increases the range of applications. The direct magnetic fixation of the magnet 5 to the iron magnetic 3 is more controllable and stable, ensuring the magnetic attraction of the magnet 5 to the iron magnetic 3, so that the insert 2 can be stably installed on the mold body 1.

[0040] In this embodiment, the insert 2 is an insert with a threaded hole, which is directly used as the mounting hole 21 for the ferrous magnetic component 3. The ferrous magnetic component 3 is designed as a ferrous plug with external threads. The ferrous magnetic component 3 is screwed and fixed in the mounting hole 21 and is detachable. The magnet 5 has a protrusion 51 integrally formed at one end near the insert 2, and the ferrous magnetic component 3 has a groove at one end near the magnet 5 that matches the contour of the protrusion 51. The protrusion 51 of the magnet 5 and the groove of the ferrous magnetic component 3 cooperate to position the ferrous magnetic component 3 and the insert 2, while improving the fixing force of the magnet 5 on the ferrous magnetic component 3.

[0041] refer to Figure 1 When the insert 2 is a through-hole insert 2, the mounting hole 21 passes through the insert 2. The insert 2 is provided with an anti-blocking head 13, which is a rod. The axis of the anti-blocking head 13 is parallel to the axis of the mounting hole 21. The anti-blocking head 13 is inserted into the mounting hole 21. The end of the anti-blocking head 13 near the iron magnetic attractor 3 is provided with a mounting rod 14. The axis of the mounting rod 14 is perpendicular to the axis of the anti-blocking head 13. The end of the iron magnetic attractor 3 near the anti-blocking head 13 is provided with a reserved hole for inserting the end of the anti-blocking head 13. The mounting rod 14 passes through both the anti-blocking head 13 and the iron magnetic attractor 3 to fix the anti-blocking head 13 and the iron magnetic attractor 3 to each other. The other end of the anti-blocking head 13 passes out of the insert 2 and closes the mounting hole 21, directly preventing plastic from entering the mounting hole 21, ensuring that the inside of the mounting hole 21 is kept clean and preventing blockage. During installation, first pass the mounting rod 14 through the anti-blocking head 13 and the iron magnetic suction piece 3 to connect the two. Then, insert the anti-blocking head 13 into the mounting hole 21 and screw the iron magnetic suction piece 3 into the mounting hole 21.

[0042] refer to Figure 2 When insert 2 is a blind hole insert 2, the mounting hole 21 does not penetrate insert 2, and the end of insert 2 away from the iron magnetic attractor 3 is naturally closed. This structural design of blind hole insert 2 eliminates the need to worry about plastic material entering the mounting hole 21 during rotational molding. Simply screw the iron magnetic attractor 3 into the mounting hole 21, and the insert 2 can be fixed to the mold body 1 by the magnetic attraction of the magnet 5.

[0043] The implementation principle of this embodiment is as follows: by installing an iron magnetic accumulator 3 inside the insert 2, the insert 2 is fixed by the magnetic attraction between the magnet 5 and the iron magnetic accumulator 3. Compared with the traditional bolt fixing method, the insert 2 can be directly separated from the side wall of the mold body 1, and the disassembly efficiency of the rotational molding product is higher. At the same time, since the iron magnetic accumulator 3 can be installed inside inserts 2 of different materials, whether it is a magnetic metal material or a non-magnetic material, the insert 2 can be fixed by the iron magnetic accumulator 3. Therefore, the applicability of the solution in this application is stronger.

[0044] Example 2:

[0045] refer to Figure 3 and Figure 4 The difference between this embodiment and embodiment 1 is that it also includes a fixing member 4 installed on the mold body 1, and a magnet 5 is installed inside the fixing member 4.

[0046] The fixing component 4 is a hollow cylindrical connector that penetrates the side wall of the mold body 1; the end of the fixing component 4 near the insert 2 has a limiting strip 6, which is a circular boss coaxial with the fixing component 4 and abuts against the inner wall of the mold body 1; the outer circumference of the fixing component 4 is provided with threads, and the end of the fixing component 4 away from the insert 2 is screwed with a nut 7. By tightening the nut 7, the nut 7 and the limiting strip 6 work together to firmly clamp the screw onto the mold body 1; a flat washer 8 is provided between the nut 7 and the mold body 1, and the flat washer 8 is clamped and fixed by the nut 7 and the mold body 1.

[0047] The fixing bolt 9 and the abutment ring 10 are provided at the end of the fixing member 4 away from the insert 2. The abutment ring 10 is welded and fixed to the end of the fixing member 4 away from the insert 2 as the end face. The fixing bolt 9 is inserted into the fixing member 4 through the central hole of the abutment ring 10. The head contour of the fixing bolt 9 is larger than the central hole of the abutment ring 10 and cannot pass through. The magnet 5 is inserted into the fixing member 4 and slides with the fixing member 4. The magnet 5 is located at the end of the fixing member 4 near the insert 2. The end of the fixing bolt 9 is screwed and fixed in the screw hole of the magnet 5. A spring washer 11 is provided between the head of the fixing bolt 9 and the abutment ring 10. The spring washer 11 plays the role of dispersing pressure and preventing loosening, thus preventing the fixing bolt 9 from loosening.

[0048] A spring washer 11 is fitted on one end of the fixing bolt 9 near the magnet 5. An elastic element 12 is fitted on the fixing bolt 9. The elastic element 12 is a spring. One end of the spring abuts against the abutment ring 10, and the other end of the spring abuts against the spring washer 11. When the fixing bolt 9 is tightened, the elastic element 12 cooperates with the spring washer 11 on the fixing bolt 9 to counteract the centrifugal force on the magnet 5 during the rotational molding process, and prevent the magnet 5 from shifting, which would reduce the magnetic attraction force on the iron magnetic attractor 3 and cause the insert 2 to fall off.

[0049] Example 3:

[0050] refer to Figure 5 and Figure 6 The difference between this embodiment and embodiment 2 is that the fixing component 4 uses a different fixing structure. The fixing component 4 includes a fixing plate 15 and a bushing 16. The fixing plate 15 is a circular plate and is located at the end of the bushing 16. The fixing plate 15 and the bushing 16 are coaxially integrated. The fixing plate 15 is provided with fastening screws 17. The fixing plate 15 is fixedly installed on the outer wall of the mold body 1 by fastening screws 17. The bushing 16 is installed through the mold body 1. The magnet 5 is slidably inserted into the bushing 16. The magnet 5 is located at the end of the bushing 16 near the insert 2. The fixing plate 15 is provided with a through hole for a fixing bolt 9 to pass through. The fixing bolt 9 passes through the fixing plate 15 and is screwed into the screw hole of the magnet 5.

[0051] A flat washer 8 and a spring washer 11 are clamped and fixed between the fixing plate 15 and the fixing bolt 9; a spring washer 11 is clamped and fixed between the fixing plate 15 and the magnet 5. The flat washer 8 can distribute the pressure on the head of the fixing bolt 9, and the spring washer 11 can play a role in preventing loosening.

[0052] During installation, spring washer 11 and magnet 5 are placed into bushing 16 in sequence. Then, fixing bolt 9 is passed through spring washer 11, abutment ring 10 and fixing plate 15. Fixing bolt 9 is screwed into screw hole of magnet 5. Magnet 5 is fixedly installed in bushing 16 by fixing bolt 9. Then, bushing 16 is inserted into mold body 1. Fixing plate 15 is fixed on mold body 1 by fastening screw 17.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A magnetic fixing structure for a rotational molding die insert, comprising a die body (1), an insert (2), and a magnet (5) for magnetically fixing the insert (2) to the die body (1), characterized in that, It also includes an iron magnetic chuck (3), and the insert (2) has a mounting hole (21) at one end near the magnet (5). The iron magnetic chuck (3) is detachably installed in the mounting hole (21) of the insert (2); the magnet (5) is detachably installed on the mold body (1); after the insert (2) is installed, the magnet (5) is in direct contact with the iron magnetic chuck (3).

2. The magnetic fixing structure for the rotational molding die insert according to claim 1, characterized in that, When the insert (2) is a through-hole insert (2), the mounting hole (21) is provided through the insert (2); an anti-blocking head (13) is provided on the side of the insert (2) away from the magnet (5), the anti-blocking head (13) is a rod body, the anti-blocking head (13) is coaxial with the mounting hole (21); the anti-blocking head (13) is located in the mounting hole (21), and an installation rod (14) is provided at one end of the anti-blocking head (13) near the iron magnetic attractor (3), the axis of the installation rod (14) is perpendicular to the axis of the anti-blocking head (13), the installation rod (14) passes through the anti-blocking head (13) and the iron magnetic attractor (3) to fix the anti-blocking head (13) and the iron magnetic attractor (3) to each other; the other end of the anti-blocking head (13) passes through the insert (2) and closes the mounting hole (21).

3. The magnetic fixing structure for the rotational molding die insert according to claim 1, characterized in that, It also includes a fixing member (4), which is installed inside the mold body (1). The fixing member (4) is a hollow cylindrical connector that penetrates the side wall of the mold body (1). The magnet (5) is located at the end of the fixing member (4) near the insert (2). The end of the fixing member (4) away from the insert (2) is provided with a fixing bolt (9) and an abutment ring (10). The abutment ring (10) is fixed on the fixing member (4) and closes the end opening of the fixing member (4). The end of the magnet (5) away from the insert (2) is provided with a threaded hole that is threaded to the fixing bolt (9). The fixing bolt (9) passes through the abutment ring (10) and is screwed and fixed in the threaded hole of the magnet (5). The nut profile of the fixing bolt (9) is larger than the center hole profile of the abutment ring (10). An elastic element (12) is provided between the abutment ring (10) and the magnet (5).

4. The magnetic fixing structure for the rotational molding die insert according to claim 3, characterized in that, The outer periphery of the fixing member (4) is provided with threads. A limiting strip (6) is fixed to one end of the fixing member (4) near the insert (2). The limiting strip (6) abuts against the mold body (1). A nut (7) is screwed to one end of the fixing member (4) away from the insert (2). The nut (7) cooperates with the limiting strip (6) to clamp and fix the screw on the mold body (1). A flat washer (8) is clamped and fixed between the nut (7) and the mold body (1).

5. The magnetic fixing structure for the rotational molding die insert according to claim 4, characterized in that, A spring washer (11) is clamped between the fixing bolt (9) and the abutment ring (10); a spring washer (11) is also fitted on one end of the fixing bolt (9) away from the abutment ring (10); one end of the elastic element (12) abuts against the head of the fixing bolt (9), and the other end of the elastic element (12) abuts against the spring washer (11).

6. The magnetic fixing structure for the rotational molding die insert according to claim 3, characterized in that, The fixing component (4) includes a fixing plate (15) and a bushing (16). The bushing (16) is installed through the mold body (1) and one end of the bushing (16) is fixed on the fixing plate (15). The fixing plate (15) is provided with fastening screws (17) and the fixing plate (15) is fixedly installed on the mold body (1) by fastening screws (17).

7. The magnetic fixing structure for the rotational molding die insert according to claim 6, characterized in that, The magnet (5) is inserted into the bushing (16), and the magnet (5) is located at the end of the bushing (16) near the insert (2); the end of the magnet (5) away from the insert (2) is provided with a screw hole, and the fixing plate (15) is provided with a fixing bolt (9) that penetrates the fixing plate (15), and the fixing bolt (9) is screwed and fixed in the screw hole of the magnet (5).

8. The magnetic fixing structure for the rotational molding die insert according to claim 7, characterized in that, A flat washer (8) and a spring washer (11) are clamped and fixed between the fixing plate (15) and the fixing bolt (9); a spring washer (11) is clamped and fixed between the fixing plate (15) and the magnet (5).

9. The magnetic fixing structure for the rotational molding die insert according to claim 1, characterized in that, The magnet (5) has a protrusion (51) at one end near the iron magnetic attractor (3), and the iron magnetic attractor (3) has a groove that matches the protrusion (51) at one end near the magnet (5).

10. The magnetic fixing structure for the rotational molding die insert according to claim 9, characterized in that, The iron magnetic accumulator (3) is a screw plug with external threads, the mounting hole (21) is a threaded hole, and the iron magnetic accumulator (3) is threadedly engaged with the mounting hole (21) of the insert (2).

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