A rotational molding mold and a rotational molding device
By setting heat-conducting components in the recessed area of the rotational molding die, the problem of insufficient heating in the recessed area is solved, and the uniformity of the wall thickness of the plastic product is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG SHENHUA SHANDA ENERGY ENVIRONMENTAL
- Filing Date
- 2025-05-08
- Publication Date
- 2026-05-29
AI Technical Summary
Existing rotational molding dies are prone to insufficient heating in the recessed areas, which prevents the plastic powder from melting completely and causes uneven wall thickness in plastic products.
Multiple heat-conducting components are set in the recessed area of the rotational molding die. The heat-conducting components are plate-shaped ribs, arranged in an array and equipped with guide grooves to improve the efficiency of hot air circulation and ensure uniform heating of the recessed area.
Through heat conduction and flow guidance, the heating efficiency of the recessed area is improved, ensuring the uniformity of the wall thickness of plastic products.
Smart Images
Figure CN224296355U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rotational molding technology, specifically to a rotational molding mold and a rotational molding device. Background Technology
[0002] Rotational molding is a plastic processing method in which the mold is constantly rotating during the process. It is mainly suitable for processing hollow, irregularly shaped, large, and structurally complex plastic products. It is widely used in lightweight equipment for large engineering vehicles, high-performance marine equipment, and hazardous chemical storage and transportation equipment. The principle involves adding plastic powder into the mold, heating and rotating it to evenly coat the inner surface of the mold, and then cooling to form the product. However, existing rotational molding molds often have some special recessed areas, which are prone to insufficient heating during processing. For example, grooves are deep and have poor hot air circulation during heating, preventing the plastic powder from melting completely. This leads to uneven heating in these areas, resulting in uneven wall thickness in the plastic product.
[0003] Therefore, there is an urgent need for a rotational molding die and rotational molding device to solve the above problems. Utility Model Content
[0004] The purpose of this invention is to solve the problem that existing rotational molding molds often have special recessed areas, which are prone to insufficient heating during processing. For example, the grooves are deep and the hot air circulation is poor during heating, which prevents the plastic powder from melting fully. This leads to uneven heating in the area and uneven wall thickness of the plastic product. The invention provides a rotational molding mold and rotational molding device.
[0005] To achieve the above objectives, the first aspect of this utility model provides a rotational molding die, which includes a rotational molding die body and a plurality of heat-conducting components. One end of the plurality of heat-conducting components is arranged in an array within a recessed area of the rotational molding die body, and the other end extends away from the recessed area.
[0006] Preferably, the heat-conducting element is a plate-shaped rib.
[0007] Preferably, the surface of the rib is provided with a guide groove along its length L.
[0008] Preferably, the width of the guide groove gradually decreases along the length L of the rib.
[0009] Preferably, the guide grooves on the surfaces of two adjacent plate-shaped ribs are the same or different in size.
[0010] Preferably, the spacing between two adjacent plate-shaped ribs is 30-50 mm.
[0011] Preferably, the length L of the rib is 100-200mm and the width W is 10-20mm.
[0012] Preferably, the end of the heat-conducting component disposed in the recessed area of the rotational molding die body has an inclination angle of 10-30° with the vertical direction.
[0013] Preferably, the heat-conducting element is made of metal.
[0014] The second aspect of this utility model provides a rotational molding apparatus, including the rotational molding mold described above.
[0015] According to the above technical solution, based on the rotational molding die, by arranging multiple heat-conducting components in an array within the recessed area of the rotational molding die body, in practical applications, the heat conduction and flow guiding effects of the heat-conducting components can effectively improve the heating efficiency of the recessed area of the rotational molding die body, thereby improving the overall heating uniformity of the rotational molding die body, and further improving the wall thickness uniformity of the plastic product. Attached Figure Description
[0016] Figure 1 This is a structural schematic diagram of a rotational molding die in a specific embodiment.
[0017] Figure 2 This is a schematic diagram of the rib structure of a rotational molding die.
[0018] Explanation of reference numerals in the attached figures
[0019] 1. Heat-conducting component; 2. Rotational molding mold body; 3. Ribs; 4. Flow channel. Detailed Implementation
[0020] The following provides a detailed description of the specific embodiments of this utility model. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this utility model.
[0021] In the description of this application, the term "comprising" and any variations thereof are meant to mean non-exclusively including, possibly including, or adding one or more other features, units, components and / or combinations thereof.
[0022] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0023] The first aspect of this utility model provides a rotational molding die, such as Figure 1-2 As shown, the rotational molding die includes a rotational molding die body 2 and multiple heat-conducting components 1. One end of each heat-conducting component 1 is arranged in an array within a recessed area of the rotational molding die body 2, and the other end extends away from the recessed area. The recessed area is not limited to grooves; any insufficiently heated recessed area on the rotational molding die body 2 should be considered a recessed area, and heat-conducting components 1 can be provided therein as needed.
[0024] According to the above technical solution, based on the rotational molding die, multiple heat-conducting components 1 are arranged in an array in the recessed area of the rotational molding die body 2. In practical applications, the heat conduction and flow guiding effects of the heat-conducting components 1 can effectively improve the heating efficiency of the recessed area of the rotational molding die body 2, thereby improving the overall heating uniformity of the rotational molding die body 2, and further improving the wall thickness uniformity of the plastic product.
[0025] In the rotational molding die of this utility model, preferably, the heat-conducting component 1 is a plate-shaped rib 3, so that while conducting heat to the recessed area based on the plate-shaped structure, it can also guide the flow of hot air based on the array distribution, thereby effectively improving the heating efficiency of the recessed area of the rotational molding die body 2, and thus improving the overall heating uniformity of the rotational molding die body 2.
[0026] Further preferred, such as Figure 2 As shown, the surface of the rib 3 is provided with a guide groove 4 along its length L, which can improve the heating efficiency of the recessed area of the rotational molding die body 2 by better guiding the hot air.
[0027] More preferably, the width of the guide groove 4 gradually decreases along the length L of the rib 3, thereby increasing the flow speed of hot air based on the design of the gradually decreasing width of the guide groove 4, and thus better improving the heating efficiency of the recessed area of the rotational molding die body 2.
[0028] In another preferred embodiment, the guide grooves 4 on the surfaces of two adjacent plate-shaped ribs 3 are the same or different in size, thereby further improving the heating efficiency of the recessed area of the rotational molding die body 2, and thus improving the wall thickness uniformity of the plastic product.
[0029] In the rotational molding mold of this utility model, preferably, the spacing between two adjacent plate-shaped ribs 3 is 30-50mm, thereby improving the hot air circulation efficiency and thus improving the heating efficiency of the recessed area of the rotational molding mold body 2.
[0030] In another preferred embodiment, the length L of the rib 3 is 100-200mm and the width W is 10-20mm, so that the appropriate size of the rib 3 can be selected according to the actual size of the recessed area, avoiding the rib 3 being too large and affecting the rotational molding process, or too small and causing the heat conduction and flow guiding effects to weaken.
[0031] In another preferred embodiment, such as Figure 1 As shown, the end of the heat-conducting component 1 located in the recessed area of the rotational molding die body 2 has an inclination angle of 10-30° with the vertical direction, preferably 15-20°, which can better improve the flow efficiency of hot air and thus improve the heating efficiency of the recessed area of the rotational molding die body 2.
[0032] In the rotational molding die of this utility model, preferably, the heat-conducting component 1 is made of metal. Specifically, the metal can be any metal with good thermal conductivity, such as copper, iron and their derivatives.
[0033] The second aspect of this utility model provides a rotational molding apparatus, including the rotational molding mold described above. Specifically, to further improve the heating uniformity of the rotationally molded product, the heating system of the rotational molding apparatus can be optimized. For example, a multi-zone independently temperature-controlled heating device can be installed inside the oven to ensure uniform heating of all parts of the mold, meeting the temperature requirements of the raw materials. More specifically, the process parameters are: oven preheating temperature of 150-200℃, heating temperature of 260-320℃, heating time of 15-20 minutes, and cooling time of 15-20 minutes. The rotating mechanism can also be improved, for example, by adopting a multi-axis rotating mechanism, enabling the mold to achieve more complex motion trajectories during heating, further improving the uniformity of plastic powder distribution. More specifically, the main shaft speed of the multi-axis rotating mechanism is 3-6 rpm / s, and the secondary shaft speed is 5-10 rpm / s. During the rotational molding process, the mold temperature is monitored in real time, and the heating power and rotation speed are dynamically adjusted through the control system to optimize the melting and uniform distribution of the plastic powder.
[0034] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.
[0035] Example 1
[0036] Adopting such Figure 1 The rotational molding die shown is used for rotational molding of plastic products. Specifically, the rotational molding die includes a rotational molding die body 2 and a plurality of heat-conducting components 1. One end of the plurality of heat-conducting components 1 is arranged in an array in the recessed area of the rotational molding die body 2, and the other end extends away from the recessed area.
[0037] Specifically, the heat-conducting component 1 is a plate-shaped rib 3, with a spacing of 40mm between two adjacent plate-shaped ribs 3, and the length L of the rib 3 is 150mm and the width W is 15mm; the end of the heat-conducting component 1 located in the recessed area of the rotational molding die body 2 has an inclination angle of 20° with the vertical direction; the heat-conducting component 1 is made of metal iron.
[0038] During the rotational molding process, multiple heat-conducting components 1 are arranged in an array within the recessed area of the rotational molding mold body 2. By conducting heat and promoting the circulation of hot air, the heating efficiency of the recessed area is improved, so as to avoid insufficient heating of the recessed area of the rotational molding mold body 2.
[0039] Testing revealed that, in practical applications, the rotational molding mold described in this invention can effectively improve the heating efficiency of the recessed area of the mold body compared to a conventional rotational molding mold without heat-conducting components. This improves the overall heating uniformity of the mold body and consequently enhances the wall thickness uniformity of the plastic product.
[0040] Example 2
[0041] Adopting such Figure 1-2 The rotational molding die shown is used for rotational molding of plastic products. Specifically, the rotational molding die includes a rotational molding die body 2 and a plurality of heat-conducting components 1. One end of the plurality of heat-conducting components 1 is arranged in an array in the recessed area of the rotational molding die body 2, and the other end extends away from the recessed area.
[0042] Specifically, the heat-conducting component 1 is a plate-shaped rib 3, with a spacing of 40mm between two adjacent plate-shaped ribs 3. The length L of the rib 3 is 150mm and the width W is 15mm. The end of the heat-conducting component 1 located in the recessed area of the rotational molding die body 2 has an inclination angle of 20° with the vertical direction. The heat-conducting component 1 is made of iron. The surface of the rib 3 is provided with a flow guide groove 4 along its length L. The width of the flow guide groove 4 gradually decreases along the length L of the rib 3. The flow guide grooves 4 on the surfaces of two adjacent plate-shaped ribs 3 are the same size.
[0043] During the rotational molding process, multiple heat-conducting components 1 are arranged in an array within the recessed area of the rotational molding mold body 2. By conducting heat and promoting the circulation of hot air, the heating efficiency of the recessed area is improved, so as to avoid insufficient heating of the recessed area of the rotational molding mold body 2.
[0044] Testing revealed that, in practical applications, the rotational molding mold described in this invention can effectively improve the heating efficiency of the recessed area of the mold body compared to a conventional rotational molding mold without heat-conducting components. This improves the overall heating uniformity of the mold body and consequently enhances the wall thickness uniformity of the plastic product.
[0045] The rotational molding mold and rotational molding device provided by this utility model, by arranging multiple heat-conducting components in an array in the recessed area of the rotational molding mold body, can effectively improve the heating efficiency of the recessed area of the rotational molding mold body based on the heat conduction and flow guiding effects of the heat-conducting components in practical applications, thereby improving the overall heating uniformity of the rotational molding mold body and thus improving the wall thickness uniformity of the plastic product.
[0046] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed by this utility model and all fall within the protection scope of this utility model.
Claims
1. A rotational molding die, characterized in that, The rotational molding die includes a rotational molding die body (2) and a plurality of heat-conducting components (1). One end of the plurality of heat-conducting components (1) is arranged in an array within the recessed area of the rotational molding die body (2), and the other end extends away from the recessed area.
2. The rotational molding die according to claim 1, characterized in that, The heat-conducting component (1) is a plate-shaped rib (3).
3. The rotational molding die according to claim 2, characterized in that, The surface of the rib (3) is provided with a flow guide groove (4) along its length L.
4. The rotational molding die according to claim 3, characterized in that, The width of the guide groove (4) gradually decreases along the length L of the rib (3).
5. The rotational molding die according to claim 3 or 4, characterized in that, The guide grooves (4) on the surfaces of two adjacent plate-shaped ribs (3) may be the same or different in size.
6. The rotational molding die according to claim 2, characterized in that, The spacing between two adjacent plate-shaped ribs (3) is 30-50 mm.
7. The rotational molding die according to claim 6, characterized in that, The rib (3) has a length L of 100-200mm and a width W of 10-20mm.
8. The rotational molding die according to claim 1 or 6, characterized in that, The heat-conducting component (1) is located in the recessed area of the rotational molding die body (2) with an inclination angle of 10-30° to the vertical direction.
9. The rotational molding die according to claim 1, characterized in that, The heat-conducting component (1) is made of metal.
10. A rotational molding apparatus, characterized in that, Includes the rotational molding die as described in any one of claims 1-9.