CN114986768B - Forming process of high-rigidity rotational molding ship body - Google Patents
Forming process of high-rigidity rotational molding ship body Download PDFInfo
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- CN114986768B CN114986768B CN202210550020.0A CN202210550020A CN114986768B CN 114986768 B CN114986768 B CN 114986768B CN 202210550020 A CN202210550020 A CN 202210550020A CN 114986768 B CN114986768 B CN 114986768B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/46—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/0625—LLDPE, i.e. linear low density polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/065—HDPE, i.e. high density polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3067—Ships
- B29L2031/307—Hulls
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a molding process of a high-rigidity rotational molding ship body, which comprises the following steps: s1: fixing a plurality of support rod assemblies in a die for rotational molding of a ship body; s2: adding PE (polyethylene) particle materials for producing the surface layer of the ship body into a die for rotational molding the ship body; s3: heating the die for rotational molding of the ship body, and keeping the die for rotational molding of the ship body to rotate continuously until the surface layer of the ship body is completely molded; s4: adding a material for producing a ship body connecting layer into a die for rotational molding of a ship body; s5: the rotational molding die for the ship body rotates and stops rotating alternately, so that the molten ship body connecting layer production material forms intermittent splashing in the rotational molding process, and the splashing material continuously forms a strip-shaped wire drawing structure between the support rod component and the ship body connecting layer; s6: starting cooling equipment, cooling to normal temperature, opening the die, and taking out the molded product; s7: and (5) driving the PU foaming material into the ship body connecting layer. The invention can greatly improve the rigidity and strength of the plastic ship body.
Description
Technical Field
The invention relates to the technical field of rotational molding hull manufacturing, in particular to a molding process of a high-rigidity rotational molding hull.
Background
The boat for cultivation is an indispensable tool in fishery cultivation, and the existing boat for cultivation is various, wherein the integrated plastic boat formed by rotational molding is light in weight, convenient to use and low in cost, and is widely applied.
The existing plastic boat for cultivation has the problem of insufficient integral rigidity in the actual use process, so that the existing plastic boat for cultivation has poor carrying capacity and potential safety hazards in use. In order to improve the overall rigidity of the plastic boat for cultivation, the conventional method is to fill the PU foaming layer in the plastic boat body, and the filled PU foaming layer is in surface contact with the plastic boat body (as shown in fig. 1). Although the rigidity of the plastic ship body is improved to a certain extent through the filling of the PU foaming layer, the effect is extremely limited, and the required rigidity and strength of the plastic ship for cultivation filled with the PU foaming layer can not be achieved in the actual use process; in addition, the ship body is often in a shaking state in the floating process in water, so that the contact surface of the PU foaming layer and the plastic ship body is easy to crack, and the problem of insufficient stability of the plastic ship for cultivation exists in the using process.
Therefore, the design of the high-rigidity rotational molding process for the plastic ship body can effectively and further greatly improve the rigidity and strength of the plastic ship body so as to meet the actual use requirements of the plastic ship for cultivation, and can effectively improve the integration and the connection effect of the PU foaming material layer and the plastic ship body, so that the stability of the plastic ship body for cultivation in the actual use process is ensured.
Disclosure of Invention
The invention aims to solve the problems of the prior art, and provides a forming process of a high-rigidity rotational molding ship body, which can effectively solve the problems of the prior art.
The technical scheme of the invention is as follows:
a molding process of a high-rigidity rotational molding ship body comprises the following steps:
S1: fixing a plurality of support rod assemblies into a die for rotational molding of the ship body through corresponding connecting pieces;
s2: adding PE (polyethylene) particle materials for producing the surface layer of the ship body into a die for rotational molding the ship body;
S3: heating a die for rotational molding of the ship body to completely melt PE (polyethylene) particle materials for producing the surface layer of the ship body; in the process, the die for rotational molding of the ship body keeps continuously rotating, and the melted PE material for producing the surface layer of the ship body starts to be coated on the inner surface of the die for rotational molding of the ship body layer by layer until the surface layer of the ship body is completely molded;
S4: adding a ship body connecting layer production material into a ship body rotational molding die, wherein the ship body connecting layer production material comprises the following components in parts by weight: 90-100 parts of PE (polyethylene) granular material for producing a ship body connecting layer and 0.3-3 parts of foaming agent;
s5: heating the die for rotational molding of the ship body to completely melt the material for producing the ship body connecting layer; in the process, the rotational molding die for the ship body rotates and stops rotating alternately, so that the molten ship body connecting layer production material forms intermittent splashing in the process of covering the inner surface of the ship body surface layer by layer, and the splashed material continuously forms a strip-shaped wiredrawing structure between the support rod component and the ship body connecting layer until the ship body connecting layer is completely molded;
s6: starting cooling equipment, cooling to normal temperature, opening the die, and taking out the molded product;
S7: and driving the PU foaming material into the ship body connecting layer to fill the PU foaming material into a space formed by the ship body connecting layer, the support rod assembly and the strip-network-shaped wiredrawing structure.
In the step S3, after at least 60% of the melted PE material for producing a hull surface layer is coated on the inner surface of the rotational molding die for a hull, the rotational molding die for a hull starts to rotate and stop rotating alternately, so that the melted PE material for producing a hull surface layer forms intermittent splashing in the process of coating the PE material for producing a hull surface layer on the inner surface of the rotational molding die for a hull layer by layer, and the splashed material continuously forms a strip-shaped wiredrawing structure between the support rod assembly and the hull surface layer.
In the steps S3 and S5, the proportion of the duration of rotation and stopping of the die for rotational molding of the ship body is 50:1-5.
The ship body rotational molding die is additionally provided with a feeding pipe, the feeding pipe is externally connected with a storage container through a corresponding one-way valve, a thermal insulation layer is arranged on the periphery of the storage container in a covering manner, and the storage container is externally connected with an air pressure pipe; in the step S2, adding PE (polyethylene) particle materials for producing the surface layers of the ship bodies into a rotational molding die of the ship bodies, and simultaneously adding materials for producing the connecting layers of the ship bodies into a storage container; in the step S5, high-pressure gas is pumped into the storage container through the external air compressor, and under the action of the high-pressure gas, the one-way valve is opened, so that the material for producing the ship body connecting layer is added into the ship body rotational molding die.
In the step S1, the support rod component is a bamboo rod with bamboo joints, the outer surface of the bamboo rod is subjected to sand blasting treatment, and the water content of the bamboo rod is not more than 40%.
In the step S3, the temperature of the air in the die for rotational molding of the ship body is increased to 200+/-20 ℃ within 15-25min, and then the temperature of the air in the die for rotational molding of the ship body is maintained to 200+/-20 ℃ until the step S5 is completed.
The PE particle material for producing the hull surface layer is LLDPE particle material.
PE (polyethylene) particle materials for producing the ship body connecting layer are LDPE/HDPE particle materials.
Accordingly, the present invention provides the following effects and/or advantages:
1) Before rotational molding, a plurality of support rod assemblies are fixed in a die for rotational molding of a ship body through connecting pieces in advance; in the rotational molding process, the surface layer of the ship body is molded in advance; and then, through the improvement of the steps S4-S5, the forming processing of the strip-network-shaped wiredrawing structure is effectively formed in the rotational molding process of the ship body connecting layer. Thereby form a great deal of irregular strip form wiredrawing structure between bracing piece subassembly and hull linking layer, under the effect of a great deal of irregular strip form wiredrawing structure, effectively link up hull linking layer and bracing piece subassembly into a stable whole to effectively link up the firm middle part at hull linking layer with the bracing piece subassembly, through the intervention of bracing piece subassembly, can effectively promote rigidity, the intensity of the plastics hull after the shaping by a wide margin, in order to satisfy the in-service use demand of plastics hull for the breed.
2) In the step 4 of the invention, the adopted ship body connecting layer production material comprises the following components in parts by weight: 90-100 parts of PE granular material for producing a ship body connecting layer and 0.3-3 parts of foaming agent. Through the intervention of PE (polyethylene) particle materials for producing the ship body connecting layer, the integrated connecting effect of the ship body connecting layer and the ship body surface layer is effectively ensured; secondly, the inner surface of the ship body connecting layer is in an irregular and uneven rough surface shape through the intervention of the foaming agent, so that the combination effect of the ship body connecting layer and the PU foaming material layer filled in later is effectively and greatly improved, and the stability of the plastic ship body for cultivation prepared by the invention in the actual use process is effectively ensured.
3) In the processing process of the step S3, after at least 60% of the PE material for producing the hull surface layer is coated on the inner surface of the die for rotational molding of the hull, the die for rotational molding of the hull starts to rotate and stop rotating alternately, so that the PE material for producing the hull surface layer is sprayed intermittently in the process of coating the PE material for producing the hull surface layer on the inner surface of the die for rotational molding of the hull layer by layer, and the sprayed material continuously forms a strip-network wire drawing structure between the support rod component and the hull surface layer.
Therefore, a strip-and-net-shaped wire drawing structure is formed and processed between the hull surface layer and the support rod assembly, so that the integrity, rigidity and strength of the plastic hull prepared by the method are further and effectively improved greatly, no influence is caused on rotational molding of the hull surface layer, and the practical effect of the plastic hull can be effectively ensured.
In the processing process of the step S3, a strip-shaped wiredrawing structure is formed and processed between the hull surface layer and the support rod component; therefore, in the subsequent shaping processing process of the ship body connecting layer, partial materials are guided and coated on the outer surface of the strip-network-shaped wiredrawing structure between the ship body surface layer and the support rod assembly, so that the combination effect of the ship body surface layer and the ship body connecting layer is effectively improved.
4) The invention adds a feeding pipe on the die for rotational molding of the ship body, the feeding pipe is externally connected with a storage container through a corresponding one-way valve, and a thermal insulation layer is covered on the periphery of the storage container. The material for producing the ship body connecting layer can be added into a material storage container before forming; in the rotational molding process of the hull surface layer, the material for producing the hull connecting layer is ensured not to melt under the action of the heat insulation layer; and then in the rotational molding process, high-pressure gas is pumped into a storage container through an external air compressor, and under the action of the high-pressure gas, the one-way valve is opened, so that the material for producing the ship body connecting layer is added into the ship body rotational molding die. The rotational molding processing of the ship body connecting layer can be smoothly connected with the rotational molding processing of the ship body surface layer, so that the rotational molding processing of the ship body connecting layer is effectively realized on the premise of high efficiency and low energy consumption.
5) The PU foaming material is filled in the space formed by the ship body connecting layer, the supporting rod component and the strip-network-shaped wire drawing structure, and then the ship body connecting layer, the supporting rod component and the strip-network-shaped wire drawing structure can be effectively connected into a whole. Under the action of the ship body connecting layer, connectivity with the ship body surface layer and the PU foaming material layer can be ensured, and under the action of a plurality of irregular strip-and-net-shaped wiredrawing structures, the fixing effect on the support rod component can be effectively ensured, so that the support rod component is effectively fixed in the middle of the ship body, and the stress on the ship body surface layer can be timely dispersed and transferred to the support rod component, thereby effectively and greatly improving the overall rigidity and strength of the plastic ship body prepared by the invention.
6) The support rod component adopted by the invention is a bamboo rod with bamboo joints, the outer surface of the bamboo rod is subjected to sand blasting treatment, and the water content of the bamboo rod is not more than 40%. Through the control of the water content, the bamboo pole is effectively ensured not to generate excessive cracking at a short time of high temperature, and the problem that smoke is diffused in the rotational molding process is avoided, so that the bamboo pole material can be smoothly used; the surface flatness of the bamboo pole is destroyed by sand blasting, so that the strip-and-strip-shaped wire drawing structure can be smoothly bonded with the outer surface of the bamboo pole, and finally is fixedly coated on the surface of the bamboo pole, and the bamboo pole material can be further smoothly used.
The bamboo poles are used as the supporting rod components, and bamboo joints of the bamboo poles can effectively ensure the overall supporting performance and bending resistance of the bamboo poles, so that the bamboo poles can improve the rigidity and strength of the ship body under lower dead weight, and can effectively form a pontoon effect so as to improve the rigidity and strength of the ship body and simultaneously effectively improve the buoyancy of the ship body.
7) In the steps S3 and S5, the proportion of the time length of rotation and stopping of the die for rotational molding of the ship body is 50:1-5, experiments show that under the condition of the duration proportion, the normal running of rotational molding of the ship body can be ensured, and the smooth molding of the strip-shaped wiredrawing knots can be ensured, so that the feasibility of the invention is effectively ensured.
Drawings
Fig. 1 is a schematic view of a plastic hull for cultivation as mentioned in the background art.
Fig. 2 is a process flow diagram of the present invention.
FIG. 3 is a schematic structural view of the plastic hull for cultivation prepared by the invention.
FIG. 4 is a partial cross-sectional view of a plastic hull for farming prepared according to the present invention.
Detailed Description
For the convenience of understanding by those skilled in the art, the structure of the present invention will now be described in further detail with reference to the accompanying drawings: it should be understood that, in this embodiment, the steps mentioned in this embodiment may be performed sequentially or sequentially, or may be performed simultaneously or partially, unless specifically stated otherwise.
Referring to fig. 2, a process for forming a high rigidity rotomoulded hull comprises the steps of:
S1: the method comprises the steps that a plurality of support rod assemblies are fixedly arranged in a ship body rotational molding die through corresponding connecting pieces, a feeding pipe is additionally arranged on the ship body rotational molding die, the feeding pipe is outwards connected with a storage container through corresponding one-way valves, a heat preservation and insulation layer is arranged on a peripheral covering device of the storage container, the storage container is outwards connected with an air pressure pipe, an openable door is arranged on the storage container so as to facilitate material addition and cleaning, the heat preservation and insulation layer is made of existing commercially available heat preservation materials, and specific materials and thicknesses of the heat preservation and insulation layer are not repeated in the prior art;
The support rod component adopted in the embodiment is a bamboo rod with bamboo joints, the outer surface of the bamboo rod is subjected to sand blasting treatment, and the water content of the bamboo rod is not more than 40%;
the connecting piece adopted in the embodiment is a double-head screw rod, a plurality of support rod assemblies are fixedly and tightly connected to the connecting piece through corresponding iron wires, and then the connecting piece is matched with a rotational molding die for the ship body to fixedly mount the plurality of support rod assemblies in place;
S2: adding PE (polyethylene) particle materials for producing the surface layers of the ship bodies into a mold for rotational molding the ship bodies, and simultaneously adding materials for producing the connecting layers of the ship bodies into a storage container;
Wherein the PE particle material for producing the hull surface layer is LLDPE particle material; the ship body connecting layer production material comprises the following components in parts by weight: 99 parts of PE (polyethylene) particle materials for producing the ship body connecting layer and 1 part of foaming agent, wherein the PE particle materials for producing the ship body connecting layer are HDPE particle materials, and the foaming agent adopts a commercially available foaming agent which is an existing product and is not described in detail herein;
S3: heating a die for rotational molding of the ship body to completely melt PE (polyethylene) particle materials for producing the surface layer of the ship body; in the process, the die for rotational molding of the ship body keeps continuously rotating, and the melted PE material for producing the surface layer of the ship body starts to be coated on the inner surface of the die for rotational molding of the ship body layer by layer until the surface layer of the ship body is completely molded;
When at least 60% of the PE material for producing the hull surface layer is coated on the inner surface of the die for rotational molding of the hull, the die for rotational molding of the hull starts to rotate and stop rotating alternately, so that the PE material for producing the hull surface layer is sprayed intermittently in the process of coating the PE material for producing the hull surface layer on the inner surface of the die for rotational molding of the hull layer by layer, and the sprayed material continuously forms a strip-shaped wiredrawing structure between the support rod component and the hull surface layer;
in this embodiment, the temperature of the air in the mold for rotational molding of the hull rises to 210 ℃ for 20min, and then the temperature of the air in the mold for rotational molding of the hull is maintained at 210 ℃ until the step S5 is completed;
S4: driving high-pressure gas into a storage container through an external air compressor, and opening a one-way valve under the action of the high-pressure gas so as to add a material for producing a ship body connecting layer into a ship body rotational molding die;
S5: in the process of adding the material for producing the ship body connecting layer, the die for rotational molding the ship body is kept heated, so that the material for producing the ship body connecting layer is completely melted; in the process, the rotational molding die for the ship body rotates and stops rotating alternately, so that the molten ship body connecting layer production material forms intermittent splashing in the process of covering the inner surface of the ship body surface layer by layer, and the splashed material continuously forms a strip-shaped wiredrawing structure between the support rod component and the ship body connecting layer until the ship body connecting layer is completely molded;
In the embodiment, after the temperature of air in the die for rotational molding of the ship body is maintained at 210 ℃ for 15min, the materials for producing the ship body connecting layer are all melted and all coated on the inner surface of the surface layer of the ship body layer by layer;
s6: starting cooling equipment, cooling to normal temperature, opening the die, and taking out the molded product;
S7: and driving the PU foaming material into the ship body connecting layer to fill the PU foaming material into a space formed by the ship body connecting layer, the support rod assembly and the strip-network-shaped wiredrawing structure.
In this embodiment, the rotation and stopping time of the rotational molding die for the ship body in the steps S3 and S5 is 50: 3, namely stopping rotating for 3s after each 50s of rotation of the die for rotational molding of the ship body.
The invention can also realize the addition of the material for producing the ship body connecting layer without additionally adding a storage container, and the specific process of the addition is as follows: after the processing of the step S3 is completed, the temperature of the ship body rotational molding die is reduced for a short time, then in a stop state, personnel wear safety gloves, then a valve arranged on a feeding pipe is opened, manual feeding is directly carried out, and the step S5 can be carried out after the manual feeding is completed.
As shown in fig. 3-4, the plastic boat body for cultivation prepared by the molding process of the invention comprises a boat body surface layer 1, wherein the inner side surface of the boat body surface layer 1 is integrally molded and inwards provided with a boat body connecting layer 2, and the inner surface of the boat body connecting layer 2 is in an irregular and uneven rough surface shape; a plurality of support rod assemblies 3 are arranged in the ship body connecting layer 2, and connecting pieces 4 and a plurality of irregularly arranged strip-shaped wiredrawing structures 5 are connected between the support rod assemblies 3 and the ship body surface layer 1 and between the support rod assemblies and the ship body connecting layer 2; the space formed by the ship body connecting layer 2, the support rod component 3 and the strip-network-shaped wiredrawing structure 5 is filled with a PU foaming material layer 6.
In this embodiment, the thicknesses of the hull surface layer 1 and the hull connecting layer 2 are 10mm, the diameter of the wire drawing is 2-5mm, and the diameter of the support rod assembly 3 is 6-12 cm.
The practical use proves that the carrying capacity of the plastic ship body prepared by the invention is far better than that of the plastic ship body for cultivation recorded in the background technology, and abnormal sound caused by cracking of the connecting surface of the ship body connecting layer 2 and the PU foaming material layer 6 does not occur under the long-time use state.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Claims (8)
1. The molding process of the high-rigidity rotational molding ship body is characterized by comprising the following steps of:
S1: fixing a plurality of support rod assemblies into a die for rotational molding of the ship body through corresponding connecting pieces;
s2: adding PE (polyethylene) particle materials for producing the surface layer of the ship body into a die for rotational molding the ship body;
S3: heating a die for rotational molding of the ship body to completely melt PE (polyethylene) particle materials for producing the surface layer of the ship body; in the process, the die for rotational molding of the ship body keeps continuously rotating, and the melted PE material for producing the surface layer of the ship body starts to be coated on the inner surface of the die for rotational molding of the ship body layer by layer until the surface layer of the ship body is completely molded;
S4: adding a ship body connecting layer production material into a ship body rotational molding die, wherein the ship body connecting layer production material comprises the following components in parts by weight: 90-100 parts of PE (polyethylene) granular material for producing a ship body connecting layer and 0.3-3 parts of foaming agent;
s5: heating the die for rotational molding of the ship body to completely melt the material for producing the ship body connecting layer; in the process, the rotational molding die for the ship body rotates and stops rotating alternately, so that the molten ship body connecting layer production material forms intermittent splashing in the process of covering the inner surface of the ship body surface layer by layer, and the splashed material continuously forms a strip-shaped wiredrawing structure between the support rod component and the ship body connecting layer until the ship body connecting layer is completely molded;
s6: starting cooling equipment, cooling to normal temperature, opening the die, and taking out the molded product;
S7: and driving the PU foaming material into the ship body connecting layer to fill the PU foaming material into a space formed by the ship body connecting layer, the support rod assembly and the strip-network-shaped wiredrawing structure.
2. The process according to claim 1, wherein in the step S3, after at least 60% of the melted PE material for producing the hull surface layer is coated on the inner surface of the rotational molding die, the rotational molding die starts to perform rotation and stop rotation alternately, so that the melted PE material for producing the hull surface layer forms intermittent splashing during the process of coating the inner surface of the rotational molding die layer by layer, and the splashed material continuously forms a strip-like wiredrawing structure between the support bar assembly and the hull surface layer.
3. The process for forming a highly rigid rotomolded hull according to claim 2, wherein in the steps S3 and S5, the ratio of the duration of rotation and stoppage of the rotational molding die for the hull is 50:1-5.
4. The process for forming the high-rigidity rotational molding hull according to claim 1, wherein a feeding pipe is additionally arranged on the rotational molding die of the hull, the feeding pipe is outwards connected with a storage container through a corresponding one-way valve, a thermal insulation layer is arranged on the periphery of the storage container in a covering manner, and the storage container is outwards connected with an air pressure pipe; in the step S2, adding PE (polyethylene) particle materials for producing the surface layers of the ship bodies into a rotational molding die of the ship bodies, and simultaneously adding materials for producing the connecting layers of the ship bodies into a storage container; in the step S5, high-pressure gas is pumped into the storage container through the external air compressor, and under the action of the high-pressure gas, the one-way valve is opened, so that the material for producing the ship body connecting layer is added into the ship body rotational molding die.
5. The process of claim 1, wherein in the step S1, the support rod assembly is a bamboo rod with bamboo joints, the outer surface of the bamboo rod is sandblasted, and the water content of the bamboo rod is not more than 40%.
6. The process according to claim 1, wherein in the step S3, the temperature of the air in the rotational molding die is increased to 200±20 ℃ for 15-25min, and then the temperature of the air in the rotational molding die is maintained at 200±20 ℃ until the step S5 is completed.
7. A process for forming a highly rigid rotomoulded hull according to claim 1, wherein the PE particulate material for producing the hull skin is a LLDPE particulate material.
8. A process for forming a highly rigid rotomoulded hull according to claim 1, wherein the PE particulate material for producing the hull tie layer is LDPE/HDPE particulate material.
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| AU2365600A (en) * | 1998-12-21 | 2000-07-12 | Magna International Of America, Inc. | Method of making rotationally moulded parts having nano-particle reinforcement |
| AU2008244738B2 (en) * | 2007-04-30 | 2011-07-21 | Charles Caulder Bree | Rotationally moulded products and moulds |
| CN207931924U (en) * | 2018-03-05 | 2018-10-02 | 王祥富 | A kind of the rotational moulding ship and its manufacture mold of Light deformation |
| CN211590994U (en) * | 2019-11-08 | 2020-09-29 | 烟台华威滚塑科技有限公司 | Rotational molding reinforced support and rotational molding product |
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