CN109501094B - Material powder processing equipment and processing technology for rotational molding - Google Patents
Material powder processing equipment and processing technology for rotational molding Download PDFInfo
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- CN109501094B CN109501094B CN201811649616.6A CN201811649616A CN109501094B CN 109501094 B CN109501094 B CN 109501094B CN 201811649616 A CN201811649616 A CN 201811649616A CN 109501094 B CN109501094 B CN 109501094B
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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
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
- B29B7/16—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with paddles or arms
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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
Abstract
The invention provides material powder processing equipment and a processing technology for rotational molding, and relates to the technical field of rotational molding. The processing equipment comprises a circular cavity and a rotary impeller, wherein the rotary impeller is arranged in the circular cavity; the annular cavity comprises an upper shell and a lower shell, and the upper shell and the lower shell form the annular cavity; arc grooves which are uniformly distributed on the circumference are arranged on the inner surface of the annular cavity along the axial direction; the rotary impeller is of a straight plate type structure and has a circular arc-shaped top end, and two side surfaces of a connecting rib between the blades are arc-shaped curved surfaces. Through the structure, the rotating impeller rotates to drive the plastic powder to be mixed with air, and radial main rotational flow is generated; the upper and lower regions of the rotating impeller form a low pressure region, and the end regions form a high pressure region, so that an axial secondary cyclone is formed; the material powder is free to rotate in the axial direction and the radial direction and is impacted and rubbed with each other to form the material powder with high roundness, high fluidity and high bulk density required by rotational molding.
Description
Technical Field
The invention relates to the technical field of rotational molding, in particular to material powder processing equipment and a processing technology for rotational molding.
Background
Rotational molding is a plastic processing mode which utilizes a rotary mold to process, and the processing process comprises the steps of putting material powder or slurry into the mold, rotating or swinging the closed mold on equipment, heating the exterior of the mold through open fire or hot air, turning and flowing the material powder or slurry inside the mold in a heated state, gradually coating the material powder or slurry on the inner surface of the mold after the temperature reaches a softening point, melting and condensing, placing the mold in a natural environment or cooling through media such as water, fog, wind and the like, and then removing the mold to take out a product.
Most rotational molding is carried out by using material powder for processing, and the performance of the material powder is a core factor influencing the quality of rotational molding products. Under the heated state, the material powder is required to flow smoothly in the die, so that avalanche rolling is avoided, and the product with uniform wall thickness and few bubbles or pores can be produced. Due to the complexity of the shape of the rotational molding product, such as poor performance of material powder, when the rotational molding processing technology finishes the product processing, the material powder can not effectively enter the narrow part of the space, bridging can occur, and a large amount of residual gas can not be discharged; meanwhile, the powder has large surface area and is easy to absorb moisture in the air, and the rotational molding processing can form a product with multiple pores and poor strength.
However, these problems are difficult to solve by adjusting the rotational molding process parameters. This places higher demands on the properties of the material powder, which requires high flowability and high bulk density. Then, the material powder in the existing rotational molding industry is mainly produced by a millstone type pulverizer, and the powder has poor flowability and low bulk density, so that the rotational molding product has poor quality. Therefore, how to prepare the material powder with high fluidity and high bulk density is a difficult problem to be solved urgently. The effective equipment and the processing technology for improving the performance of the material powder are provided, and the technical bottleneck problem of the domestic rotational molding industry is solved.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides material powder processing equipment and a processing technology for rotational molding, and solves the technical problems of poor flowability and low bulk density of material powder prepared by the existing processing equipment.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
in one aspect, a material powder processing apparatus for rotational moulding, the processing apparatus comprising:
a circular cavity;
the rotary impeller is rotatably arranged inside the circular cavity;
the ring-shaped cavity comprises:
an upper shell is arranged on the upper side of the shell,
the upper shell and the lower shell form a circular cavity; the inner walls of the upper shell and the lower shell are both first arc curved surfaces; the first end part of the first arc curved surface is positioned at the joint of the upper shell and the lower shell, and the second end part of the first arc curved surface is positioned in the middle of the upper shell and the lower shell;
the first arc curved surface is provided with an arc curved groove, the groove extends from the first end part of the first arc curved surface to the second end part, and the grooves are uniformly distributed on the first arc curved surface.
Preferably, a concave structure extends towards the inside of the cavity from the middle position of the upper shell and the lower shell, and the second end of the first arc curved surface is connected with the concave structure.
Preferably, the rotary impeller includes:
the blade is of a straight plate type structure;
the blades are uniformly distributed on the outer wall of the rotating shaft along the circumferential direction.
Preferably, the end of the blade remote from the axis of rotation is semi-circular.
Preferably, the height of the blade is D4, the maximum height inside the cavity is D3, and the D4 is 50-60% of the D3;
the diameter of the rotating impeller is D1, the inner diameter of the cavity is D2, and D2 is 80-85% of D1.
Preferably, the rotary impeller further comprises:
the connecting ribs are positioned between adjacent blades, and two sides of each connecting rib are arc-shaped curved surfaces;
the curved surface includes:
the first end part of the first curved surface is positioned at the middle position of the blade, and the second end part of the first curved surface is positioned at the first side part of the blade close to one end part of the rotating shaft;
and the first end part of the second curved surface is positioned in the middle of the blade, and the second end part of the second curved surface is positioned at the second side part of the blade close to one end part of the rotating shaft.
Preferably, the processing apparatus further comprises:
the feeder hopper, the feeding direction of feeder hopper with the vertical direction of processing equipment is the contained angle setting.
On the other hand, the processing technology of the material powder for rotational molding comprises the following steps:
s1, adding plastic powder or a mixture of the plastic powder and particles into the rotating impeller in a low-speed rotating state;
s2, increasing the rotating speed of the rotating impeller to 4500-6000 rpm, heating the mixture to 80-105 ℃, mixing and stirring for 5-8 min;
and S3, opening a discharge hole after stirring, and discharging.
Preferably, the rotation speed of the rotary impeller in the step S1 is 300 to 600 rpm.
(III) advantageous effects
The invention provides material powder processing equipment for rotational molding and a processing technology. Compared with the prior art, the method has the following beneficial effects:
according to the material powder processing equipment and the processing technology for rotational molding provided by the invention, the material powder is driven to be mixed with air by the rotating impeller to generate a radial main rotational flow; a side clearance area is formed between the circular cavity and the straight plate type rotating impeller, after the rotating impeller rotates, a structure formed by the cavity and the straight plate type blade forms a low-pressure area in the upper part and the lower part of the rotating impeller and the central area of the rotating impeller through the rotation of the rotating impeller, a high-pressure area is formed in the end area of the rotating impeller, and an axial secondary rotational flow is formed under the action of pressure difference; arc grooves are uniformly distributed on the circumference of the inner surface of the annular cavity along the axial direction, and the radial main rotational flow is properly blocked, so that the axial auxiliary rotational flow is improved.
The material powder is suspended in the air and can rotate in the axial direction and the radial direction in a three-dimensional and free mode, no dead angle exists in material powder processing, the material powder is accumulated on the inner surface of the annular cavity, the whole processing is uniform and consistent, the material powder and the air are mixed, the melting agglomeration is prevented, and meanwhile, the moisture content of the material powder can be reduced through high-temperature processing. The material powder is subjected to impact friction, the surface of the material powder is softened, and the material powder with high roundness, high fluidity and high bulk density required by rotational molding is formed after the temperature and time conditions required by the processing technology are met. The technical problems of poor flowability and low bulk density of the material powder prepared by the existing processing device are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an exploded view of a toroidal cavity structure embodying the present invention;
FIG. 2 is a first perspective cross-sectional view of a toroidal cavity structure in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view showing the overall structure of the lower case according to the embodiment of the present invention;
FIG. 4 is a schematic view of the overall structure of a rotary impeller according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a rotating impeller according to an embodiment of the present invention;
FIG. 6 is a second perspective sectional view of a toroidal cavity structure in accordance with an embodiment of the present invention;
fig. 7 is a sectional view showing the overall structure of the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Based on the description of the background technology, the embodiment of the invention provides material powder processing equipment and a processing technology for rotational molding, and the general idea is as follows:
in the circular sealed cavity, the rotating impeller drives the mixture of material powder and air to generate radial main rotational flow, a side surface gap area is formed between the circular sealed cavity and the straight plate type rotating impeller, after the rotating impeller rotates, a structure formed by the cavity and the straight plate type blade forms low-pressure areas in the upper and lower areas of the rotating impeller and the central area of the rotating impeller through the rotation of the rotating impeller, and a high-pressure area is formed in the end area of the rotating impeller, so that axial auxiliary rotational flow is formed; meanwhile, under the action of the first arc curve and the groove on the first arc curve, axial rotation of material powder is promoted, and therefore the proportion of the radial main rotational flow and the axial auxiliary rotational flow required by a machining process is achieved. The material powder is suspended in high-speed flowing air, and is stereoscopically rotated along the axial direction and the radial direction, and is mutually impacted and rubbed, when the temperature and time conditions required by the processing technology are met, the surface of the material powder is softened, the surface has edges and corners, the position resistance of tail fibers is large, and after the material powder is mutually polished by air impact, the material powder with high roundness, high fluidity and high bulk density required by rotational molding is formed.
As shown in fig. 6 and 7, wherein arrow a represents the radial main swirl and arrow B represents the axial auxiliary swirl.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
A material powder processing device for rotational moulding is shown in figures 1 and 2 and comprises a cavity 1 and a rotary impeller 2; wherein, the rotary impeller 2 is rotatably arranged in the cavity 1; the cavity 1 comprises an upper shell 101 and a lower shell 102, wherein the upper shell 101 and the lower shell 102 form the cavity 1, that is, the upper shell 101 and the lower shell 102 are closed to form a cavity with an effective space inside.
As shown in fig. 1 and 3, the inner walls of the upper shell 101 and the lower shell 102 are both first arc curved surfaces; the first end of the first arc curved surface is located at the joint of the upper shell 101 and the lower shell 102, and the second end of the first arc curved surface is located at the middle position of the upper shell 101 and the lower shell 102.
As shown in fig. 2, when the upper housing 101 and the lower housing 102 are combined, the first arc curved surfaces of the two can be butted, so that the inside of the cavity 1 is in an arc curved surface structure, thereby facilitating the material powder to rotate inside the cavity 1.
Further, the structure of the chamber and the straight plate type blades, as shown in fig. 2, forms a low pressure region in the upper and lower regions of the rotary impeller 2, i.e., the region between the upper and lower side portions of the rotary impeller 2 and the upper and lower inner walls of the chamber 1, and the central portion region of the rotary impeller forms a lower region, by the rotation of the rotary impeller; a high pressure zone is formed in the end region of the rotating impeller 2, i.e. in the region between the end of the rotating impeller 2 and the inner side wall of the chamber 1. Forming an axial auxiliary rotational flow B under the action of pressure difference between the two;
as shown in fig. 3 and 6, the first arc curved surface is provided with grooves 1021, the grooves 1021 extend from a first end to a second end of the first arc curved surface, and a plurality of grooves 1021 are uniformly distributed on the first arc curved surface, and when the upper casing 101 and the lower casing 102 are combined, the grooves 1021 can be butted to form a continuous groove structure.
Above-mentioned embodiment is in the implementation, and when the mixture of rotatory impeller 2 drive material powder and air, produce radial main whirl A in cavity 1 inside, simultaneously because adjacent recess 1021 can form the arch, can form certain the blockking to material powder through this arch, and recess 1021 sets up on first circular arc curved surface, and consequently material powder can extend to recess 1021 and promote axial vice whirl B, promotes axial vice whirl B through recess 1021 and reaches certain flow.
The material powder can be rotated and rubbed in axial and radial directions to form high-fluidity and high-bulk density material powder with high roundness and required for rotational molding.
Meanwhile, the device is completely operated in the closed cavity, no dust pollution exists, the pollution problem of chemical agents to the environment and materials is avoided, and the device is high in operability and practicability.
Impact grinding of material powder is increased through the protrusions between the grooves 1021, and meanwhile, a small vortex can be formed in the grooves 1021 to increase material powder friction.
To avoid powder deposition at the bottom of the groove 1021, the bottom of the groove 1021 is provided with a chamfer and the chamfer is provided with a radiused transition.
In specific implementation, in order to promote the material powder to form axial rotation inside the cavity 1, as shown in fig. 2, a recessed structure extends from the middle position of the upper housing 101 and the lower housing 102 to the inside of the cavity, wherein the recessed structure at the middle position of the upper housing 101 is a first recessed structure 1012, the recessed structure at the middle position of the lower housing 102 is a second recessed structure 1022, and the second end of the first arc-shaped curved surface is connected with the recessed structure, so that the material powder can rotate downward along the groove 1021 in the first arc-shaped curve, and is prevented from directly falling down.
In a specific implementation, as shown in fig. 1, 4 and 5, the rotary impeller 2 comprises:
the blade 201 is of a straight plate type structure; a side clearance area is formed between the circular cavity and the blade 201;
the blades 201 are uniformly distributed on the outer wall of the rotating shaft 3 along the circumferential direction.
Specifically, the rotating shaft 3 is connected to the motor 4 through a rotating member 401, and the rotating shaft 3 is driven to rotate by the motor 4, so as to drive the vane 201 to rotate.
Specifically, in order to facilitate the assembly of the whole structure, the rotating shaft 3 penetrates through the lower housing 102 from the position of the second recessed structure 1022, and is connected with the lower housing 102 through the first bearing 302, the lower end of the lower housing 102 is further provided with a base 5, the second bearing 303 is arranged at the connection position of the rotating shaft 3 and the base 5, and the bearing base 301 is arranged between the first bearing 302 and the second bearing 303 of the rotating shaft 3.
In specific implementation, as shown in fig. 2 and 5, one end of the blade 201 away from the rotating shaft 3 is semicircular, and the semicircular structure is configured to correspond to the arc curved surface structure of the inner wall of the cavity 1.
In specific implementation, as shown in fig. 2, the height of the blade 201 is D4, the maximum height inside the cavity 1 is D3, and D4 is 50-60% of D3;
as shown in fig. 7, the diameter of the rotating impeller 2 is D1, the inner diameter of the cavity 1 is D2, and D2 is 80-85% of D1. The design determines that the speed ratio of the radial main rotation A to the axial rotation B of the high-speed air is about 1: 3-5, so that the plastic powder can rotate in the axial direction and the radial direction and impact friction can be effectively realized, and the high-fluidity, high-bulk density and low-porosity material powder with high roundness and required by rotational molding can be formed. By controlling the rotating speed in two dimensional directions, the impact friction between material powder is promoted,
in specific implementation, the rotary impeller 2 further includes:
the connecting ribs 202 are positioned between the adjacent blades 201, and two sides of each connecting rib 202 are curved surfaces;
as shown in fig. 1, 4 and 5, the curved surfaces include a first curved surface 2021 and a second curved surface 2022,
the first end of the first curved surface 2021 is located at the middle position of the blade 201, and the second end of the first curved surface 2021 is located at the first side of the blade 201 close to one end of the rotating shaft 3;
the first end of the second curved surface 2022 is located at the middle position of the blade 201, and the second end of the second curved surface 2022 is located at the second side of the blade close to one end of the rotating shaft 3.
Specifically, the vertical distance between the first end of the first curved surface 2021 and the first end of the second curved surface 2022 is smaller than the height of the blade 201, and the two may also be combined together.
Through this first curved surface 2021 and second curved surface 2022, with the inside circular arc curved surface of cavity 1, can produce effectual continuous axial rotation to the curved surface has the drainage effect, is favorable to producing axial rotation B. The first curved surface 2021 and the second curved surface 2022 facilitate the formation of a low pressure region and a high pressure region inside the chamber 1, and increase the pressure difference between the low pressure region and the high pressure region, thereby increasing the strength of the axial secondary cyclone B.
At the same time, the connecting rib 202 can increase the strength of the blade 201.
In specific implementation, the processing equipment further comprises:
The processing equipment provided by the embodiment forms two symmetrical axial vortexes, namely the axial vortexes B, in addition to the radial main vortexes A, in the cavity, the material powder is suspended in the air and rotates in a three-dimensional manner, the mutual friction between the powder and the cavity wall is increased, the friction temperature between the powder and the cavity wall is increased, the surface of the material powder is softened, the surface has edges and corners, the position resistance of tail fibers is large, and after the material powder is subjected to air flow impact polishing, the material powder with high roundness, high fluidity, high stacking density, low porosity and low water content required by rotational molding is formed.
In the processing equipment provided by the embodiment of the invention, an upper shell and a lower shell form a closed cavity, a rotating impeller drives the mixture of material powder and air to generate a radial main rotational flow A, a structure formed by the cavity and a straight plate type blade forms a low-pressure area in the upper part and the lower part of the rotating impeller 2 through the rotation of the rotating impeller, and a high-pressure area is formed in the end part area of the rotating impeller 2 through the structure formed by the cavity and the straight plate type blade and the rotation of the rotating impeller, so that an axial auxiliary rotational flow B is formed; meanwhile, the axial auxiliary rotational flow B is promoted to reach a certain flow under the action of the first arc curve and the groove 1021 on the first arc curve, so that the ratio of the radial main rotational flow A to the axial auxiliary rotational flow B required by a machining process is 3-5: 1, and the performance of a product is improved.
The plastic powder with high roundness, high flowability and high bulk density required by rotational molding can be formed under the conditions of axial and radial free rotation and mutual impact friction by effectively realizing the three-dimensional free rotation and mutual impact friction of the mixture of the material powder and the air along the axial direction and the radial direction to generate heat energy so as to soften the surface of the material powder.
In addition, the embodiment of the invention also provides a processing technology for processing the material powder for rotational molding by using the device, which comprises the following steps:
s1, adding plastic powder or plastic particle mixture under the rotation state of the rotating impeller;
specifically, the plastic powder and plastic particle mixture is added from the feed hopper 1011, and in order to facilitate rapid feeding and exert the centrifugal force effect, the rotating speed of the rotary impeller 2 is adjusted to 300-600 rpm to facilitate rapid feeding of the material powder, and the amount of the material powder mixture added is 30-40% of the volume of the cavity.
S2, increasing the rotating speed of the rotating impeller to 4500-6000 rpm, heating to 80-85 ℃, and stirring for 5-8 min; the mixture can rotate freely and impact each other in the axial direction and the radial direction;
specifically, after the material powder mixture is added, a working button is started; the rotary impeller 2 is driven by a motor and quickly heats material powder at 6000 rpm with the highest rotating speed of 4500, when the temperature in the cavity is close to the set temperature, a PID electric control system is formed by a temperature sensor, a temperature controller and a frequency converter, the speed of the motor is reduced by the frequency converter until the set working temperature is constant and the motor runs at the automatically corresponding rotating speed, the material powder is rotated, impacted and rubbed for 5-8 minutes, the shape of the material powder is flat, the problem of tail fibers is solved, and the material powder with high performance, high stacking density and low porosity is formed.
And S3, opening a discharge hole after stirring, and discharging.
Specifically, the processed plastic particle mixture is discharged from a discharge port 1022.
The rotating speed of the rotating impeller 2 is theoretically higher, the efficiency of processing the material powder is higher, and in practice, the rotating speed is too high, the material powder is excessively heated due to excessive impact friction, and the problem of melting and caking exists. Therefore, the rotating speed is limited to 4500-6000 revolutions/divided into initial heating rotating speed and the highest rotating speed of the equipment, when the material powder is at the optimal working temperature which is close to the set value in the working process, a PID electric control system is formed by a temperature sensor, a temperature controller and a frequency converter, the speed of the motor is reduced by the frequency converter until the set working temperature is constant and the motor can automatically operate at the corresponding rotating speed, the maximization of the working efficiency is automatically realized, the temperature is related to the rotating speed, and the automatic control can be realized.
According to the processing technology provided by the embodiment of the invention, under the action of the radial main rotational flow A and the axial rotational flow B in the cavity 1, the plastic mixture enables the material powder to be suspended in the air, and the plastic mixture rotates in the axial direction and the radial direction in a three-dimensional manner and impacts and rubs, the temperature is increased to soften the surface of the material powder, the surface has edges and corners, the position resistance of the tail fiber is large, and after the plastic mixture is impacted and polished by airflow, the tail fiber is removed to form the material powder with high roundness, so that the material powder with high fluidity, high stacking density and low porosity required by rotational molding is realized. Meanwhile, the water content in the material powder is volatilized at high temperature during processing, so that the water content is reduced. Because the material powder is light, plastic microspheres can be added into the powder to enhance impact friction and improve working effect.
To illustrate the embodiment of the present invention in more detail, the PE material powder was prepared by the apparatus and processing method in the above examples, and the PE material powder prepared by the conventional method was selected as a comparison. The performance of the PE material powder is detected by a national standard method, wherein the flowability of the PE material powder prepared by the embodiment of the invention is 16S/100L, the bulk density is 0.42KG/L, the water content is less than 0.25%, and the elimination of the tail fibers is observed under a microscope, so that the roundness is better.
The flowability of PE material powder prepared by the traditional method is 24S/100 mL; the bulk density of P is 0.35 KG/L; the powder was observed under a microscope to be flat and to have tadpole-shaped fibers.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a material powder processing equipment for rotational moulding, its characterized in that, processing equipment includes:
a circular cavity;
the rotary impeller is rotatably arranged inside the circular cavity;
the ring-shaped cavity comprises:
an upper shell is arranged on the upper side of the shell,
the upper shell and the lower shell form a circular cavity; the inner walls of the upper shell and the lower shell are both first arc curved surfaces; the first end part of the first arc curved surface is positioned at the joint of the upper shell and the lower shell, and the second end part of the first arc curved surface is positioned in the middle of the upper shell and the lower shell;
the first arc curved surface is provided with arc curved grooves, the arc curved grooves extend from the first end part of the first arc curved surface to the second end part, and the arc curved grooves are uniformly distributed on the first arc curved surface.
2. The powder processing equipment for rotational molding materials as claimed in claim 1, wherein the upper casing and the lower casing form a circular cavity, and a concave structure extends from the center of the circular cavity to the inside of the cavity.
3. The powder processing apparatus for rotational molding material according to claim 1, wherein said rotary impeller comprises:
the blade is of a straight plate type structure;
the blades are uniformly distributed on the outer wall of the rotating shaft along the circumferential direction.
4. The powder processing apparatus for rotational molding material according to claim 3, wherein an end of said blade remote from said rotational axis is semicircular.
5. The powder processing apparatus for rotational molding material according to claim 3, wherein the blade has a height of D4, the maximum height inside the cavity is D3, and the D4 is 50-60% of the D3;
the diameter of the rotating impeller is D1, the inner diameter of the cavity is D2, and D2 is 80-85% of D1.
6. The apparatus for powder processing of a material for rotational molding according to claim 3, wherein said rotary impeller further comprises:
the connecting ribs are positioned between adjacent blades, and two axial sides of each connecting rib are arc-shaped curved surfaces;
the curved surface includes:
a first end of the first arc curved surface is positioned at the middle position of the blade, and a second end of the first arc curved surface is positioned at a first side part of the blade close to one end of the rotating shaft;
and the first end part of the second arc curved surface is positioned in the middle of the blade, and the second end part of the second arc curved surface is positioned at the second side part of the blade close to one end part of the rotating shaft.
7. The apparatus for processing powder of material for rotational molding according to any one of claims 1 to 6, further comprising:
the feeder hopper, the feeding direction of feeder hopper with the vertical direction of processing equipment is the contained angle setting.
8. A processing technology of material powder for rotational molding is characterized in that the material powder processing equipment for rotational molding according to any one of claims 1 to 7 is used for processing, and the processing technology specifically comprises the following steps:
s1, adding plastic powder or a mixture of the plastic powder and the particles under the rotating state of the rotating impeller;
s2, increasing the rotating speed of the rotating impeller to 4500-6000 rpm, heating the mixture to 80-105 ℃, and stirring for 5-8 min;
and S3, opening a discharge hole after stirring, and discharging.
9. The powder processing process of rotational molding material according to claim 8, wherein the rotational speed of the rotary impeller in step S1 is 300-600 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811649616.6A CN109501094B (en) | 2018-12-30 | 2018-12-30 | Material powder processing equipment and processing technology for rotational molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811649616.6A CN109501094B (en) | 2018-12-30 | 2018-12-30 | Material powder processing equipment and processing technology for rotational molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109501094A CN109501094A (en) | 2019-03-22 |
| CN109501094B true CN109501094B (en) | 2020-09-11 |
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| EP1471093A1 (en) * | 2003-04-22 | 2004-10-27 | Bayer Aktiengesellschaft | Process and apparatus for producing thermoplastic resins modified with an elastomer |
| CN101265343A (en) * | 2008-04-09 | 2008-09-17 | 南京聚隆化学实业有限责任公司 | Special-purpose material for high-strength high-ductility high-fluidity rotational molding and preparation method thereof |
| CN101973088A (en) * | 2010-09-03 | 2011-02-16 | 长兴清华粉体及新材料工程中心有限公司 | Preparation method of high liquidity rotational moulding raw material powder |
| CN203196561U (en) * | 2013-04-16 | 2013-09-18 | 孙罗娇 | Mixed liquid stirring tank |
| CN106079148A (en) * | 2016-07-31 | 2016-11-09 | 安徽爱迪滚塑科技股份有限公司 | Self-priming balanced type rotational moulding Raw material processing device |
| CN108059763A (en) * | 2017-12-20 | 2018-05-22 | 宁波春华汽配有限公司 | A kind of high-fluidity rotational molding polyethylene mixture and preparation method thereof |
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| EP1471093A1 (en) * | 2003-04-22 | 2004-10-27 | Bayer Aktiengesellschaft | Process and apparatus for producing thermoplastic resins modified with an elastomer |
| CN101265343A (en) * | 2008-04-09 | 2008-09-17 | 南京聚隆化学实业有限责任公司 | Special-purpose material for high-strength high-ductility high-fluidity rotational molding and preparation method thereof |
| CN101973088A (en) * | 2010-09-03 | 2011-02-16 | 长兴清华粉体及新材料工程中心有限公司 | Preparation method of high liquidity rotational moulding raw material powder |
| CN203196561U (en) * | 2013-04-16 | 2013-09-18 | 孙罗娇 | Mixed liquid stirring tank |
| CN106079148A (en) * | 2016-07-31 | 2016-11-09 | 安徽爱迪滚塑科技股份有限公司 | Self-priming balanced type rotational moulding Raw material processing device |
| CN108059763A (en) * | 2017-12-20 | 2018-05-22 | 宁波春华汽配有限公司 | A kind of high-fluidity rotational molding polyethylene mixture and preparation method thereof |
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