CN114986768A - Forming process of high-rigidity rotationally-molded ship body - Google Patents
Forming process of high-rigidity rotationally-molded ship body Download PDFInfo
- Publication number
- CN114986768A CN114986768A CN202210550020.0A CN202210550020A CN114986768A CN 114986768 A CN114986768 A CN 114986768A CN 202210550020 A CN202210550020 A CN 202210550020A CN 114986768 A CN114986768 A CN 114986768A
- Authority
- CN
- China
- Prior art keywords
- hull
- ship body
- layer
- rotational molding
- molding die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention relates to a forming process of a high-rigidity rotationally molded ship body, which comprises the following steps: s1: fixing a plurality of support rod assemblies in a ship body rotational molding mold; s2: adding a PE granular material for hull surface layer production into a hull rotational molding die; s3: heating the ship body rotational molding die, and keeping the ship body rotational molding die to rotate continuously until the surface layer of the ship body is completely molded; s4: adding a material for producing a hull connecting layer into a hull rotational molding die; s5: the ship body rotational molding die performs alternate operation of rotation and stop rotation, so that the melted material for producing the ship body connecting layer forms intermittent splashing in the rotational molding process, and the splashed material continuously forms a strip-shaped wiredrawing structure between the supporting rod assembly and the ship body connecting layer; s6: starting cooling equipment, cooling to normal temperature, opening the mold and taking out the molded product; s7: and (3) driving the PU foaming material into a connecting layer of the ship body. The invention can greatly improve the rigidity and the strength of the plastic hull.
Description
Technical Field
The invention relates to the technical field of rotational moulding hull manufacturing, in particular to a forming process of a high-rigidity rotational moulding hull.
Background
The breeding boat is an essential tool in fishery breeding, the existing breeding boat is various, and the integral plastic boat formed by rotational molding is widely applied due to light weight, convenient use and low price.
The existing plastic boat for cultivation has the problem of insufficient integral rigidity in the actual use process, so that the carrying capacity of the boat is poor, and potential safety hazards in use exist. In order to improve the overall rigidity of the plastic boat for cultivation, the conventional method is to fill a PU foam layer in the plastic boat body, and the filled PU foam 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 by filling the PU foaming layer, the effect is extremely limited, and the plastic ship for cultivation filled with the PU foaming layer still cannot achieve the required rigidity and strength in the actual use process; and because the ship body is frequently in a shaking state in the floating process in water, the contact surface of the PU foaming layer and the plastic ship body is easy to crack, and the plastic ship for cultivation has the problem of insufficient stability in the using process.
Therefore, the invention aims to design the forming process of the high-rigidity rotational molding ship body, which can effectively and greatly improve the rigidity and the strength of the plastic ship body so as to meet the actual use requirement of the plastic ship for cultivation, and can effectively improve the integration and the connection effect of the PU foam material layer and the plastic ship body so as to ensure the stability of the plastic ship body for cultivation in the actual use process.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a forming process of a high-rigidity rotationally molded ship body, which can effectively solve the problems in the prior art.
The technical scheme of the invention is as follows:
a forming process of a high-rigidity rotationally molded ship body comprises the following steps:
s1: fixing a plurality of support rod assemblies in a ship body rotational molding die through corresponding connecting pieces;
s2: adding a PE granular material for hull surface layer production into a hull rotational molding die;
s3: heating a mould for ship rotational molding to completely melt PE granular materials for ship surface layer production; in the process, the ship body rotational molding die keeps continuously rotating, and the molten PE material for ship body surface layer production is covered on the inner surface of the ship body rotational molding die layer by layer until the ship body surface layer is completely molded;
s4: adding a material for producing a hull connecting layer into a die for rotational molding of a hull, wherein the material for producing the hull connecting layer comprises the following components in parts by weight: 90-100 parts of PE granular material for producing a hull connecting layer and 0.3-3 parts of foaming agent;
s5: heating the ship body rotational molding die to completely melt the materials for producing the ship body connecting layer; in the process, the ship body rotational molding die carries out rotation and stop alternating operation, so that molten ship body joining layer production materials form intermittent splashing in the process of covering the inner surface of the ship body surface layer by layer, and the splashed materials continuously form a strip-shaped wiredrawing structure between the support rod assembly and the ship body joining layer until the ship body joining layer is completely formed;
s6: starting cooling equipment, cooling to normal temperature, opening the mold and taking out the molded product;
s7: and (3) driving the PU foaming material into the hull connection layer, so that the PU foaming material is filled in the space formed by the hull connection layer, the support rod assembly and the strip-shaped wiredrawing structure.
In the step S3, after not less than 60% of the molten PE material for hull surface production is coated on the inner surface of the die for hull rotational molding, the die for hull rotational molding starts to rotate and stop alternately, so that the molten PE material for hull surface production forms intermittent splashing in the process of coating the inner surface of the die for hull rotational molding layer by layer, and the splashed material continuously forms a strip-shaped wiredrawing structure between the support rod assembly and the hull surface.
In the steps S3 and S5, the rotation/stoppage time length ratio of the ship body rotational molding die is 50: 1-5.
The ship body rotational molding die is additionally provided with a feeding pipe, the feeding pipe is outwards connected with a storage container through a corresponding one-way valve, the periphery of the storage container is covered with a heat insulation layer, and the storage container is outwards connected with an air pressure pipe; in the step S2, the PE particle material for hull surface layer production is added into the die for hull rotational molding, and simultaneously the material for hull tie layer production is added into the storage container; in the step S5, high-pressure gas is pumped into the storage container through an external air compressor, and under the action of the high-pressure gas, the check valve is opened, so that the material for producing the hull connection layer is added into the hull rotational molding die.
In the step S1, the supporting rod assembly is a bamboo rod with bamboo joints, the outer surface of the bamboo rod is subjected to sand blasting, and the moisture content of the bamboo rod is not more than 40%.
In the step S3, the temperature of the air in the ship body rotational molding die rises to 200 +/-20 ℃ within 15-25min, and then the temperature of the air in the ship body rotational molding die is maintained at 200 +/-20 ℃ until the step S5 is completed.
The PE granular material for producing the hull surface layer is LLDPE granular material.
The PE granular material for producing the hull connecting layer is LDPE/HDPE granular material.
Accordingly, the present invention provides the following effects and/or advantages:
1) before rotational molding, a plurality of support rod assemblies are fixedly arranged in a ship body rotational molding die in advance through connecting pieces; in the rotational molding process, the surface layer of the ship body is formed and processed in advance; and then, through the improvement of the steps S4-S5, the forming processing of the strip-shaped wiredrawing structure is effectively formed in the rotational molding process of the ship body connecting layer. Thereby form a great deal of anomalous strip and twine form wire drawing structure between bracing piece subassembly and hull linkage layer, under the effect of a great deal of anomalous strip and twine form wire drawing structure, effectively link up hull linkage layer and bracing piece subassembly into a stable whole to effectively link up the firm linking of bracing piece subassembly at the middle part on hull linkage layer, 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 breeding with the plastics hull.
2) In step 4 of the invention, the adopted materials for producing the hull connecting layer comprise the following components in parts by weight: 90-100 parts of PE granular material and 0.3-3 parts of foaming agent for producing the hull tie layer. The integrated connection effect of the hull connecting layer and the hull surface layer is effectively ensured through the intervention of the PE granular material for producing the hull connecting layer; secondly, the inner surface of the hull connection layer is effectively made to be irregular and uneven hairy surface shape through the intervention of the foaming agent, so that the combination effect of the hull connection layer and the PU foaming material layer filled subsequently is effectively and greatly improved, and the stability of the plastic hull for cultivation prepared by the invention in the actual use process is effectively ensured.
3) In the processing process of step S3, after not less than 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 alternately, so that the PE material for producing the hull surface layer forms intermittent splashing 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 splashed material continuously forms a strip-shaped wiredrawing structure between the support rod assembly and the hull surface layer.
Therefore, the strip-shaped wire drawing structure is also formed and processed between the surface layer of the ship body and the supporting rod assembly, so that the integrity, the rigidity and the strength of the plastic ship body prepared by the invention are further effectively and greatly improved, and the rotational molding of the surface layer of the ship body cannot be influenced, so that the practical effect of the plastic ship body can be effectively ensured.
In the processing process of step S3, a strip-like wire drawing structure is also formed and processed between the hull surface layer and the support rod assembly; therefore, in the subsequent forming process of the hull connecting layer, partial materials are guided and coated on the outer surface of the strip-shaped wire drawing structure between the hull surface layer and the supporting rod assembly, so that the combination effect of the hull surface layer and the hull connecting layer is effectively improved.
4) The invention is characterized in that a feeding pipe is additionally arranged on a ship body rotational molding die, the feeding pipe is outwards connected with a storage container through a corresponding one-way valve, and a heat insulation layer is covered on the periphery of the storage container. Materials for producing the hull connecting layer can be added into the material storage container before forming; in the rotational molding process of the hull surface layer, materials for producing the hull connecting layer are ensured not to be melted under the action of the heat insulation layer; and then in the rotational molding process, high-pressure gas is pumped into a material storage container through an external air compressor, under the action of the high-pressure gas, a one-way valve is opened, and the material for producing the hull connecting layer is added into a die for rotational molding of the hull. The rotational molding processing of the hull connection layer can be smoothly connected with the rotational molding processing of the hull surface layer, so that the rotational molding processing of the hull connection 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 assembly and the strip-and-network-shaped wire drawing structure, and can effectively connect the ship body connecting layer, the supporting rod assembly and the strip-and-network-shaped wire drawing structure into a whole. Under the action of the ship body connecting layer, the connection between the ship body connecting layer and the ship body surface layer and the PU foaming material layer can be ensured, and under the action of a plurality of irregular strip-shaped wire drawing structures, the fixing effect of the support rod assembly can be effectively ensured, so that the support rod assembly is effectively fixed in the middle of the ship body, the stress on the ship body surface layer can be timely dispersed and transmitted to the support rod assembly, and the overall rigidity and strength of the plastic ship body prepared by the invention are effectively and greatly improved.
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 excessive cracking of the bamboo poles is effectively avoided under the short-term high temperature, and the problem that the bamboo poles are diffused by smoke in the rotational molding process can be avoided, so that the bamboo pole material can be smoothly applied; and through sand blasting treatment, the surface flatness of the bamboo pole is damaged, so that the strip-net-shaped wire drawing structure can be favorable for the outer surface of the bamboo pole to form bonding, and is finally fixed and coated on the surface of the bamboo pole, and the bamboo pole material can be smoothly applied.
And regard as bracing piece subassembly with the bamboo pole, the bamboo joint of bamboo pole can effectively ensure its whole support nature and bending resistance nature itself, consequently, it can realize the promotion to rigidity, the intensity of hull under lower dead weight, and it can effectively form the flotation pontoon effect to when promoting the rigidity and the intensity of hull, effectively promote the buoyancy of hull.
7) In steps S3 and S5 of the present invention, the ratio of the rotation time to the stop time of the ship body rotational molding die is 50: 1-5, experiments show that under the condition of the duration proportion, normal operation of rotational molding of the ship body can be ensured, and the strip-and-network-shaped wiredrawing knots can be smoothly molded, so that the practicability of the invention is effectively ensured.
Drawings
Fig. 1 is a schematic structural view of a plastic hull for cultivation in the background art.
FIG. 2 is a process flow diagram of the present invention.
Fig. 3 is a schematic structural diagram of the plastic hull for cultivation prepared by the invention.
Fig. 4 is a partial sectional view of the plastic hull for cultivation prepared by the present invention.
Detailed Description
To facilitate understanding of those skilled in the art, the structure of the present invention will now be described in further detail by way of examples in conjunction with the accompanying drawings: it should be understood that the steps mentioned in the embodiment, except for the sequence specifically mentioned, can be performed simultaneously or partially simultaneously according to the actual requirement.
Referring to fig. 2, a process for forming a high rigidity rotomoulded hull includes the steps of:
s1: the device comprises a plurality of supporting rod assemblies, a plurality of connecting pieces, a plurality of supporting rod assemblies, a feeding pipe, a material storage container, a heat insulation layer and a pneumatic pipe, wherein the supporting rod assemblies are fixedly arranged in a ship body rotational molding die through the corresponding connecting pieces;
the supporting 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-end screw, the supporting rod assemblies are fixedly fastened and connected to the connecting piece through corresponding iron wires, and then the supporting rod assemblies are fixedly installed in place through the matching of the connecting piece and a ship body rotational molding die;
s2: adding a PE (polyethylene) granular material for producing a hull surface layer into a hull rotational molding die, and simultaneously adding a material for producing a hull connecting layer into a storage container;
wherein the PE granular material for producing the hull surface layer is LLDPE granular material; the material for producing the hull connecting layer comprises the following components in parts by weight: the production method comprises the following steps of (1) preparing 99 parts of PE granular material and 1 part of foaming agent for producing the hull connecting layer, wherein the PE granular material for producing the hull connecting layer is HDPE granular material, and the foaming agent is a commercially available foaming agent which is an existing product and is not described any more;
s3: heating a mould for ship rotational molding to completely melt PE granular materials for ship surface layer production; in the process, the mould for ship body rotational moulding keeps continuously rotating, and the molten PE material for ship body surface layer production is covered on the inner surface of the mould for ship body rotational moulding layer by layer until the ship body surface layer is completely formed;
after not less than 60% of the melted PE material for hull surface production is coated on the inner surface of the hull rotational molding die, the hull rotational molding die starts to alternately rotate and stop, so that the melted PE material for hull surface production forms intermittent splashing in the process of coating the inner surface of the hull rotational molding die layer by layer, and the splashed material continuously forms a strip-shaped wiredrawing structure between the support rod assembly and the hull surface;
in the embodiment, the air temperature in the ship body rotational molding die is increased to 210 ℃ in 20min, and then the air temperature in the ship body rotational molding die is maintained at 210 ℃ until the step S5 is completed;
s4: high-pressure gas is pumped into a material storage container through an external air compressor, and a one-way valve is opened under the action of the high-pressure gas so as to add the material for producing the ship hull connecting layer into a ship hull rotational molding die;
s5: in the process of adding the material for producing the hull connecting layer, keeping heating the die for rotationally moulding the hull, and completely melting the material for producing the hull connecting layer; in the process, the ship body rotational molding die carries out rotation and stop alternating operation, so that molten ship body joining layer production materials form intermittent splashing in the process of covering the inner surface of the ship body surface layer by layer, and the splashed materials continuously form a strip-shaped wiredrawing structure between the support rod assembly and the ship body joining layer until the ship body joining layer is completely formed;
in the embodiment, after the air temperature in the ship body rotational molding die is maintained at 210 ℃ for 15min, all the materials for ship body connection layer production are melted and all the materials are coated on the inner surface of the ship body surface layer by layer;
s6: starting cooling equipment, cooling to normal temperature, opening the mold and taking out the molded product;
s7: and (3) driving the PU foaming material into the hull connection layer, so that the PU foaming material is filled in the space formed by the hull connection layer, the support rod assembly and the strip-shaped wiredrawing structure.
In this embodiment, the ratio of the time length of the rotation and the stop of the ship body rotational molding die in the steps S3 and S5 is 50: and 3, stopping the rotation for 3 seconds after the rotation of the ship body rotational molding mould is 50 seconds.
The invention can also realize the addition of the material for producing the hull connecting layer under the condition of not additionally adding a material storage container, and the specific process of the addition is as follows: after the step S3 is completed, the ship body rotational molding die is cooled for a short time, then in a shutdown state, a person wears safety gloves, then a valve arranged on a feeding pipe is opened, manual feeding is directly performed, and after the manual feeding is completed, the step S5 can be performed.
As shown in fig. 3-4, the plastic hull for cultivation prepared by the forming process of the invention comprises a hull surface layer 1, a hull joining layer 2 is integrally formed on the inner side surface of the hull surface layer 1 and inwards arranged, and the inner surface of the hull joining layer 2 is in an irregular and uneven rough surface shape; a plurality of supporting rod assemblies 3 are arranged inside the hull connecting layer 2, and connecting pieces 4 and a plurality of irregularly arranged strip-shaped wiredrawing structures 5 are connected between the plurality of supporting rod assemblies 3 and the hull surface layer 1 and the hull connecting layer 2; the ship body connecting layer 2, the supporting rod component 3 and the space formed by the strip-shaped wire drawing structure 5 are filled with a PU foaming material layer 6.
In the embodiment, the thickness of the hull surface layer 1 and the thickness of the hull connecting layer 2 are both 10mm, the diameter of the drawn wire is between 2 and 5mm, and the diameter of the support rod assembly 3 is between 6 and 12 cm.
Practical use proves that the load-carrying capacity of the plastic hull prepared by the invention is far better than that of the plastic hull for cultivation recorded in the background technology, and abnormal sound caused by cracking of the connecting surface of the hull connecting layer 2 and the PU foam material layer 6 does not occur in a 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 can 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 usage of the words first, second and third, etcetera do not indicate any ordering. 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the terminology used in the description presented above should not be understood as necessarily referring 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Claims (8)
1. A forming process of a high-rigidity rotationally molded ship body is characterized by comprising the following steps:
s1: fixing a plurality of support rod assemblies in a ship body rotational molding die through corresponding connecting pieces;
s2: adding a PE granular material for hull surface layer production into a hull rotational molding die;
s3: heating a mould for rotational molding of the ship body to completely melt PE granular materials for production of the surface layer of the ship body; in the process, the mould for ship body rotational moulding keeps continuously rotating, and the molten PE material for ship body surface layer production is covered on the inner surface of the mould for ship body rotational moulding layer by layer until the ship body surface layer is completely formed;
s4: adding a material for producing a hull connecting layer into a die for rotational molding of a hull, wherein the material for producing the hull connecting layer comprises the following components in parts by weight: 90-100 parts of PE granular material for producing a hull connecting layer and 0.3-3 parts of foaming agent;
s5: heating the ship body rotational molding die to completely melt the materials for producing the ship body connecting layer; in the process, the ship body rotational molding die carries out rotation and stop alternating operation, so that molten ship body joining layer production materials form intermittent splashing in the process of covering the inner surface of the ship body surface layer by layer, and the splashed materials continuously form a strip-shaped wiredrawing structure between the support rod assembly and the ship body joining layer until the ship body joining layer is completely formed;
s6: starting cooling equipment, cooling to normal temperature, opening the mold and taking out the molded product;
s7: and (3) driving the PU foaming material into the hull connection layer, so that the PU foaming material is filled in the space formed by the hull connection layer, the support rod assembly and the strip-shaped wiredrawing structure.
2. The process of claim 1, wherein in step S3, after not less than 60% of the molten PE material for hull surface production is coated on the inner surface of the mold for hull rotational molding, the mold for hull rotational molding starts to rotate and stop alternately, so that the molten PE material for hull surface production forms intermittent splashing in the process of coating the inner surface of the mold for hull rotational molding layer by layer, and the splashed material continuously forms a strip-shaped wiredrawing structure between the strut rod assembly and the hull surface.
3. The process of claim 2, wherein in the steps S3 and S5, the rotation and stoppage time ratio of the ship body rotational molding die is 50: 1-5.
4. The forming process of a high-rigidity rotational moulding ship body according to claim 1, wherein a feeding pipe is additionally arranged on the ship body rotational moulding die, the feeding pipe is outwards connected with a material storage container through a corresponding one-way valve, a heat insulation layer is covered on the periphery of the material storage container, and the material storage container is outwards connected with a pneumatic pipe; in the step S2, the PE particle material for hull surface layer production is added into the die for hull rotational molding, and simultaneously the material for hull tie layer production is added into the storage container; in the step S5, high-pressure gas is pumped into the storage container through an external air compressor, and under the action of the high-pressure gas, the check valve is opened, so that the material for producing the hull connection layer is added into the hull rotational molding die.
5. The forming process of a high-rigidity rotomoulded hull according to claim 1, wherein in step S1, the adopted supporting rod assemblies are bamboo poles with bamboo joints and sand-blasted outer surfaces, and the water content of the bamboo poles is not more than 40%.
6. The process for molding a rotomoulded hull according to claim 1, wherein the temperature of the air inside the hull mold for rotational moulding is raised to 200 ± 20 ℃ in 15-25min in step S3, and then the temperature of the air inside the hull mold for rotational moulding is maintained at 200 ± 20 ℃ until step S5 is completed.
7. A process for forming a high rigidity rotomoulded hull according to claim 1 in which the PE particulate material for the skin of the hull is LLDPE particulate material.
8. The process of claim 1 wherein the PE particulate material for hull tie layer production is LDPE/HDPE particulate material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210550020.0A CN114986768A (en) | 2022-05-20 | 2022-05-20 | Forming process of high-rigidity rotationally-molded ship body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210550020.0A CN114986768A (en) | 2022-05-20 | 2022-05-20 | Forming process of high-rigidity rotationally-molded ship body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114986768A true CN114986768A (en) | 2022-09-02 |
Family
ID=83027783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210550020.0A Pending CN114986768A (en) | 2022-05-20 | 2022-05-20 | Forming process of high-rigidity rotationally-molded ship body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114986768A (en) |
-
2022
- 2022-05-20 CN CN202210550020.0A patent/CN114986768A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108278421A (en) | Assembly type plastic pressure pipe, production mould, production method and plastic plate, piping lane | |
| CN104361942B (en) | A kind of simple lay wire aluminium alloy core cable and preparation method thereof | |
| CN107351414A (en) | A kind of solid propellant rocket heat insulation layer and its forming method and crowded expanding installation | |
| CN114986768A (en) | Forming process of high-rigidity rotationally-molded ship body | |
| CN106335197A (en) | Processing method of pneumatic rubber capsule special for petroleum drilling machine | |
| CN109103508A (en) | A method of improving soft package lithium battery angle position fold | |
| CN104385546B (en) | PP and TPU composite double-layer hollow plastic plate coextrusion manufacture technology | |
| CN206954891U (en) | A kind of thermal insulation box body | |
| CN210552929U (en) | High-efficient extrusion device that modifies of waste plastic | |
| CN107021158A (en) | A kind of bicycle bicycle basket and its production method | |
| CN217374818U (en) | High-rigidity rotationally-molded ship body | |
| CN206703338U (en) | A kind of anti-sticking pellet device of extruder | |
| CN209224555U (en) | Make the tool component of composite double layer insulating tube | |
| CN108032577A (en) | High intensity cleaning PE films and preparation method thereof | |
| CN209738451U (en) | heat insulation structure | |
| CN113071179A (en) | High barrier tape stretch film and method of producing the same | |
| CN221112935U (en) | Novel plastic heat preservation pipeline manufacture equipment | |
| CN207234576U (en) | A kind of plastic-spraying stator cage of automobile starter | |
| CN206582320U (en) | Plastic inner lining fiber reinforced plastic pressure container | |
| CN206779399U (en) | A kind of aluminium ingot cools down well | |
| CN111053347A (en) | Preparation method of draw-bar box | |
| CN206536007U (en) | Improved casting wheel mold side mould cooling apparatus | |
| CN201964792U (en) | Aluminum-plastic composite heat radiator | |
| CN104231486A (en) | Production method for energy-saving plastic door window sectional material | |
| CN109849475B (en) | Heat insulation composite structure and forming method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |