CN114030822B

CN114030822B - Composite scraping plate and preparation method thereof

Info

Publication number: CN114030822B
Application number: CN202111286006.6A
Authority: CN
Inventors: 张兴刚; 王彦辉; 赵玉; 张翅; 辛同帅; 李平辉; 徐金波
Original assignee: Zhengzhou Coal Mining Machinery Longwall Equipment Co ltd; Luoyang Sunrui Rubber and Plastic Technology Co Ltd
Current assignee: Zhengzhou Coal Mining Machinery Longwall Equipment Co ltd; Luoyang Sunrui Rubber and Plastic Technology Co Ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2023-06-23
Anticipated expiration: 2041-11-02
Also published as: CN114030822A

Abstract

The invention provides a composite scraping plate and a preparation method thereof, wherein the composite scraping plate comprises a core plate and a scraping plate body, the core plate is arranged in the scraping plate body, and the preparation raw materials of the core plate comprise fiber reinforced resin matrix composite materials; the scraper blade body is prepared from wear-resistant resin. Compared with the prior art, the composite scraping plate reduces 20-25kg compared with a metal scraping plate assembly on one hand, and can achieve the effect of reducing the weight by 57-71%; on the other hand, the prepared composite scraping plate has better strength, and the bending load of the composite scraping plate can reach 129.29-172.09kN; when the strength effect is best, the highest bending load reaches or even exceeds the scraping plate prepared by using the metal material as the core plate and using the nonmetal material as the scraping plate body; in addition, the abrasion of the scraper conveyor and the connecting part of the scraper conveyor can be reduced, the energy consumption is saved by 60 percent for a user, and the production efficiency is improved by 80 percent.

Description

Composite scraping plate and preparation method thereof

Technical Field

The invention relates to the technical field of conveying machinery, in particular to a composite scraping plate and a preparation method thereof.

Background

The scraper is a main part in equipment such as a mining scraper conveyor, a reversed loader and the like, is also the part with the largest mining equipment consumption, the largest accessory demand and the most easy loss, directly influences the production cost, and particularly adopts the scraper with high-cost materials, and has higher production cost. In addition, with the improvement of the transportation capacity and efficiency of coal mine equipment, the specifications of a scraper conveyor, a reversed loader and the like are increased year by year, the sizes and the specifications of scraper components are increased along with the increase of the current scraper structure and materials, the load of the whole machine is increased, the power of a power part is required to be synchronously increased, and on one hand, the increase of the power causes the increase of energy consumption and the waste of resources due to the particularity of the mine equipment, and meanwhile, the power of the whole machine equipment cannot be increased without limitation, so that the improvement of the coal mining efficiency and the economic benefit is restricted.

Most of the scrapers are metal scrapers at present, the bottoms of conveying equipment are worn greatly, complete equipment is seriously damaged, the service life is short, and the production efficiency is low.

The scraper assembly of the conveyor at home and abroad has the following problems:

(1) The existing scraper assembly has the defects of high self weight, low running speed of equipment, high energy consumption and low production efficiency under the same motor power caused by 35kg of each group, and 24000kg of scraper assembly is arranged in the equipment.

(2) The hardness of the existing steel scraper assembly is greater than or equal to that of the bottom of the equipment, the contact surface of the equipment is seriously worn in the transportation process, the service life of the equipment is short, the ton consumption of products in production is high, and the production cost is high.

(3) The existing scraper assembly is 35kg, is difficult to replace by 2 persons, is inconvenient to operate, lightens the weight of the scraper assembly, benefits production staff, lightens the labor intensity, is embodied by people, and also solves the technical problem of replacement operation.

Along with the development of various industries, the improvement of productivity is a trend, so that the weight reduction of the scraper assembly of the conveyor is urgent, and is an important and key way for realizing energy conservation and emission reduction in China.

The patent of the application number CN201510293692.8 in the prior art discloses a composite scraper made of nonmetallic materials and a metal core plate for coal mines, as shown in figure 1, which consists of a nonmetallic scraper body 1 and a metal core plate 2; the positions of the holes in the metal core plate 2 are consistent with the machining drilling positions of the original metal scraping plates, and the structure of the nonmetal material and metal core plate composite scraping plates after the manufacture is completed is consistent with that of the existing metal scraping plates. The metal scraping plate is improved to be compounded with the metal core plate, the original forging and machining process is changed into the process of directly casting the non-metal material to form the forged metal core plate in the die, the process is simplified, the weight and the production period of parts are greatly reduced, the loading of the scraper conveyor for the coal mine is greatly reduced, but the scraper weight is large, the running speed of equipment is low, the energy consumption is high, and the production efficiency is low.

In view of this, the present invention has been made.

Disclosure of Invention

The invention aims to provide a composite scraping plate and a preparation method thereof, which are used for solving the problems of high weight of the scraping plate, low running speed of equipment, high energy consumption and low production efficiency in the prior art.

In order to achieve the above purpose, the technical scheme of the invention is realized as follows:

the composite scraping plate comprises a core plate and a scraping plate body, wherein the core plate is arranged in the scraping plate body, and the preparation raw materials of the core plate comprise fiber reinforced resin matrix composite materials; the scraper blade body is prepared from wear-resistant resin.

The invention relates to a composite scraping plate, wherein a core plate is arranged in a scraping plate body, and the preparation raw materials of the core plate comprise fiber reinforced resin matrix composite materials; the raw materials for preparing the scraper body are wear-resistant resin, and the core plate and the scraper body are made of nonmetallic materials, so that on one hand, the weight of the scraper body is reduced by 20-25kg compared with that of a metal scraper assembly, and the effect of 57-71% weight reduction can be achieved; on the other hand, the prepared composite scraping plate has better strength, and the bending load of the composite scraping plate can reach 129.29-172.09kN; when the strength effect is best, the highest bending load reaches or even exceeds the scraping plate prepared by using the metal material as the core plate and using the nonmetal material as the scraping plate body; in addition, the abrasion of the scraper conveyor and the connecting part of the scraper conveyor can be reduced, the energy consumption is saved by 60 percent for a user, and the production efficiency is improved by 80 percent.

Further, the fiber reinforced resin matrix composite comprises 25-60wt% of a resin matrix, 35-65wt% of a reinforcing body and 5-10wt% of a functional auxiliary agent.

Further, the resin matrix is a thermosetting resin or a thermoplastic resin.

Further, the resin matrix is a thermosetting resin, and the thermosetting resin is one or more of polyurethane, epoxy resin, vinyl resin, bismaleimide resin and polyimide resin.

Further, the resin matrix is thermoplastic resin, and the thermoplastic resin is one or more of polyamide, high-density polyethylene, polyurethane, polytetrafluoroethylene, ultra-high molecular weight polyethylene, polyoxymethylene and polyimide.

Further, the raw materials of the reinforcement are one or more of glass fiber, carbon fiber, quartz fiber, basalt fiber, aramid fiber and polyimide fiber.

Further, the reinforcement is continuous fiber unidirectional cloth or continuous fiber fabric or continuous fiber mixed knitting yarn.

Further, the functional auxiliary agent is one or more of flame retardant, antistatic agent, lubricant, interfacial activator and anti-aging agent.

A method for producing a composite screed according to any one of the above, comprising the steps of:

s100, preparing a prepreg of the fiber reinforced resin matrix composite material by using a resin matrix, a reinforcement and an auxiliary agent;

s200, shaping, cutting, layering design and embedding;

s300, preparing a core board by compression molding;

s400, presetting the prepared core plate in a scraping plate die, and coating the wear-resistant resin layer on the outer layer of the core plate to prepare the scraping plate body.

On one hand, the composite scraping plate prepared by the preparation method of the composite scraping plate is reduced by 20-25kg compared with a metal scraping plate assembly, and the effect of 57-71% weight reduction can be achieved; on the other hand, the prepared composite scraping plate has better strength, and the bending load of the composite scraping plate can reach 129.29-172.09kN; when the strength effect is best, the highest bending load reaches or even exceeds the scraping plate prepared by using the metal material as the core plate and using the nonmetal material as the scraping plate body; in addition, the abrasion of the scraper conveyor and the connecting part of the scraper conveyor can be reduced, the energy consumption is saved by 60 percent for a user, and the production efficiency is improved by 60 percent.

s200, shearing and mixing by an extruder;

s300, preparing a core plate by online extrusion compression molding or online injection molding;

s400, coating the wear-resistant resin layer on the outer layer of the core plate to prepare the scraper blade body.

The preparation method of the composite scraping plate has higher production efficiency and improves the production efficiency by 80 percent.

Compared with the prior art, the composite scraping plate and the preparation method have the following beneficial effects:

1) According to the composite scraping plate and the preparation method thereof, the core plate and the scraping plate body are made of nonmetallic materials, the amount of the prepared composite scraping plate is reduced by 20-25kg compared with that of a metal scraping plate assembly, and the effect of reducing the weight by 51-71% can be achieved.

2) According to the composite scraping plate and the preparation method, the prepared composite scraping plate has good strength, and the bending load of the composite scraping plate can reach 129.29-172.09kN; when the strength effect is best, the highest bending load reaches or even exceeds the scraping plate prepared by using the metal material as the core plate and using the nonmetal material as the scraping plate body.

3) According to the composite scraping plate and the preparation method, the core plate is arranged in the scraping plate body, and the preparation raw materials of the core plate comprise fiber reinforced resin matrix composite materials; the raw materials for preparing the scraper blade body are wear-resistant resin, so that on one hand, the abrasion of fibers in the core plate can be effectively reduced, namely, the abrasion of the scraper blade body is reduced, and the service life of the scraper blade body is prolonged; on the other hand, the abrasion of the middle groove of the scraper conveyor, namely the abrasion of the connecting part of the scraper conveyor can be reduced; in addition, the wear resistance of the composite scraping plate is superior to that of the metal scraping plate component, and the bottom of the equipment is protected, so that the shutdown maintenance times of the conveyor are reduced, the service cycle is prolonged, and the production efficiency is greatly improved.

4) The composite scraping plate and the preparation method have the characteristics of flame retardance and static resistance, and can be used for any mine material transportation; can save 60% of energy consumption for users and improve the production efficiency by 80%.

Drawings

FIG. 1 is a schematic view of a composite screed according to the prior art;

FIG. 2 is a schematic perspective view of a composite screed according to an embodiment of the present invention;

FIG. 3 is a schematic top view of a composite screed according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of the structure of FIG. 3 along section line AA;

FIG. 5 is a schematic front view of a core plate of a composite screed according to an embodiment of the present invention;

FIG. 6 is a schematic illustration of the end body of the core plate of one of the composite screeds of FIG. 5 with simplified structural dimensioning;

fig. 7 is a schematic perspective view of a core plate of a composite screed according to an embodiment of the present invention.

Reference numerals illustrate:

1. a scraper body; 2. a core plate; 21. a body; 211. a mounting hole; 212. a weight reduction groove; 213. reinforcing ribs; 22. an end body; 221. a first lower end surface; 222. a lower cambered surface; 223. a first upper end surface; 224. an upper cambered surface; 225. a tail cambered surface; 3. a vertical joint surface; 4. and a first avoidance space.

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The description of "first," "second," etc. in embodiments of the present invention is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The invention will be described in detail below with reference to the drawings in connection with embodiments.

The invention provides a composite scraping plate, which is shown in fig. 2-7, and comprises a core plate 2 and a scraping plate body 1, wherein the core plate 2 is arranged in the scraping plate body 1, and the preparation raw materials of the core plate 2 comprise fiber reinforced resin matrix composite materials, as shown in fig. 4; the scraper body 1 is prepared from wear-resistant resin.

According to the composite scraping plate disclosed by the invention, the core plate 2 is arranged in the scraping plate body 1, and the preparation raw materials of the core plate 2 comprise fiber reinforced resin matrix composite materials; the raw materials for preparing the scraper body 1 are wear-resistant resin, and the core plate 2 and the scraper body 1 are made of nonmetallic materials, so that on one hand, the weight of the scraper body is reduced by 20-25kg compared with that of a metal scraper assembly, and the effect of 57-71% weight reduction can be achieved; on the other hand, the prepared composite scraping plate has better strength, and the bending load of the composite scraping plate can reach 129.29-172.09kN; when the strength effect is best, the highest bending load reaches or even exceeds that of the scraping plate prepared by using the core plate 2 as a metal material and the scraping plate body 1 as a nonmetal material; in addition, the energy consumption can be saved by 60 percent for a user, and the production efficiency is improved by 80 percent.

Compared with the integrally formed fiber reinforced resin matrix composite scraping plate, the composite scraping plate can effectively prevent the abrasion of fibers in the core plate 2, namely reduce the abrasion of the core plate and prolong the service life of the core plate; on the other hand, the abrasion of the middle groove of the scraper conveyor, namely the abrasion of the connecting part of the scraper conveyor can be reduced; in addition, the wear resistance of the composite scraping plate is superior to that of the metal scraping plate component, and the bottom of the equipment is protected, so that the shutdown maintenance times of the conveyor are reduced, the service cycle is prolonged, and the production efficiency is greatly improved.

Compared with an integrally formed wear-resistant resin scraper, the composite scraper prepared by the composite scraper has better strength, and the bending load of the composite scraper can reach 129.29-172.09kN; when the strength effect is best, the highest bending load reaches or even exceeds that of the scraping plate prepared by the core plate 2 made of the metal material and the scraping plate body 1 made of the nonmetal material.

Specifically, as shown in fig. 5, the core 2 includes a main body 21, and end bodies 22 located at the left and right ends of the main body 21, a vertical joint surface 3 is provided between the main body 21 and the end bodies 22, the end bodies 22 are in an arc-shaped shrinkage structure in the shape of a wing, and shrink outwards from the vertical joint surface 3, the end bodies 22 include a first lower end surface 221, an included angle between the first lower end surface 221 and a horizontal plane is 0 ° < a <5 °, and a first avoiding space 4 is provided between the first lower end surface 221 and the main body 21.

The included angle between the first lower end surface 221 and the horizontal plane is 0 ° < a <5 °, and the limitation of the angle makes the core plate 2 reduce the weight to the greatest extent, and on the other hand, the strength of the core plate 2 can be effectively ensured, and the structural size and the structural strength of the wear-resistant resin scraper body 1 are affected, so that the weight reduction, the tensile strength, the wear resistance and the like of the composite scraper are affected to a certain extent.

Specifically, as shown in fig. 5 and 6, the end body 22 includes a tail arc surface 225, a first upper end surface 223, an upper arc surface 224, the vertical joint surface 3, a lower arc surface 222, and the first lower end surface 221, which are sequentially joined end to end and form a closed body, and the lower arc surface 222 is located above the first avoidance space 4.

Specifically, the multi-surface arrangement of the end body 22, especially the multi-arc surface design, is more beneficial to improving the interface bonding and wrapping area of the end body and non-metal materials such as wear-resistant resin, and further effectively ensuring the bonding strength of the end body and the non-metal materials such as wear-resistant resin; meanwhile, under the condition of ensuring the service strength, the thickness of the wear-resistant resin layer is increased, and the wear resistance of the contact surface with the middle groove is ensured.

Preferably, in this embodiment, as shown in fig. 5 and 6, an included angle between the first upper end surface 223 and a horizontal plane is 5 ° < B <15 °, an included angle between the tail arc surface 225 and the first upper end surface 223 is 45 ° < C <80 °, an included angle between the tail arc surface 225 and the first lower end surface 221 is 110 ° < D <160 °, a length of the tail arc surface 225 is E, a height of the first avoidance space 4 is F, a width is G, a height of the vertical joint surface 3 is H, a length of the first lower end surface 221 is M, a length of the first upper end surface 223 is N, and then e= (0.8-1.2) = (1.5) = (1-1.5) = F, h= (3-5) = F, m= (5-8) = (0.7-0.9) = M.

Specifically, the above-mentioned limitation of the angle and the structural dimensional relation of the end body 22 can make the core plate 2 not affect the structural strength of the core plate 2 as the core plate 2 while reducing the weight to the maximum extent, and on the other hand affect the structural size and the structural strength of the wear-resistant resin blade body 1, and further affect the shock absorption, the tensile strength, the wear resistance and the like of the composite blade to a certain extent.

More specifically, the structural dimensions include length, width, and thickness dimensions.

Preferably, in this embodiment, on the premise that the width dimension is kept moderately unchanged, by further optimizing the structural dimension of the end body 22, when the end body 22 is further ensured to be used as the core plate 2, the structural dimension of the end body has enough structural strength, and has enough interfacial bonding wrapping area with the cladding layer of the scraper body 1, and meanwhile, the thickness dimension and the length dimension of the scraper body 1 which are matched with the end body 22 after the end body is fully wrapped are further ensured, so that the weight is reduced to the greatest extent and the scraper body is matched with the middle groove, and meanwhile, when the complex severe operation conditions such as coal, stone and the like are handled, the whole composite scraper has enough structural strength and wear resistance.

Preferably, in this embodiment, a smooth arc treatment is used between the engagement surfaces of the end body 22.

Specifically, a full-wrapping structure with smooth radian treatment is adopted between the joint surfaces of the end body 22, so that on one hand, during composite molding, the interface bonding wrapping area of the end body 22 is further improved, and the bonding strength with the wear-resistant resin scraper body 1 is further effectively ensured; on the other hand, after composite molding, the stress shearing action of the core plate 2 on the abrasion-resistant resin scraping plate body 1 can be effectively reduced, and the probability or the occurrence time of falling off of the interface bonding wrapping part after long-time use is reduced or delayed.

Specifically, a weight reduction groove 212 is provided in the body 21.

The provision of the weight reduction grooves 212 may further reduce the weight of the composite screed.

Specifically, as shown in fig. 7, when the weight-reducing groove 212 is formed in the upper end surface of the body 21, the traction force applied to the joint between the body 21 and the chain is the greatest, and the joint is most susceptible to the abrasion of the chain, and when the weight-reducing groove 212 is formed in the upper end surface of the body 21, the weight-reducing groove 212 may be filled with the composite blade during casting or compression molding, so as to further reduce the weight of the composite blade. However, it should be noted that, since the body 21 is provided with the mounting hole 211 therethrough, the third connecting member is matched with the pressing plate to assemble the chain and the scraping plate into a whole after passing through, and the position of the mounting hole 211 still needs to be maintained when the weight-reducing groove 212 is filled for casting or compression molding.

Specifically, the upper edge of the vertical joint surface 3 is joined to the weight-reducing groove 212, so that the structural strength of the whole core plate 2 can be further enhanced, and the structural strength of the whole composite scraping plate can be further enhanced.

Specifically, as shown in fig. 7, a reinforcing rib 213 is provided on the body 21.

The arrangement of the reinforcing ribs 213 can further enhance the overall structural strength of the core plate 2, thereby enhancing the overall structural strength of the composite scraping plate.

Preferably, as shown in fig. 7, the reinforcing ribs 213 are disposed on both sides of the weight-reducing groove 212, and the reinforcing ribs 213 have equal widths at any place.

The wear-resistant resin is one or more of ultrahigh molecular weight high-density polyethylene and polyurethane.

Example 1

The core plate 2 is prepared from a fiber reinforced resin matrix composite material; the scraper body 1 is prepared from ultra-high molecular weight high-density polyethylene.

The fiber reinforced resin matrix composite comprises 25wt% of a resin matrix, 65wt% of a reinforcement and 10wt% of a functional auxiliary agent.

The resin matrix is a thermosetting resin, which in this embodiment is a bismaleimide resin.

The raw material of the reinforcement is carbon fiber.

The reinforcement is a continuous fiber fabric.

The functional auxiliary agents include flame retardants, antistatic agents, lubricants, interfacial activators, and anti-aging agents.

Specifically, the flame retardant is not limited. In this embodiment, the flame retardant is PX200.

The addition of the flame retardant PX200 enables the core plate 2 to have permanent heat resistance and flame retardance, and plays a role in flame retardance.

Specifically, the lubricant and the antistatic agent are not limited. In this embodiment, the lubricant and antistatic agent are both erucamide.

Specifically, the interfacial activator is not limited. The interfacial activator may be a silane coupling agent, the interfacial activator may also be a maleic anhydride grafted polymer, and the interfacial activator may also be a mixture of a silane coupling agent and a maleic anhydride grafted polymer.

In this example, the interfacial activator is a mixture of a silane coupling agent and a maleic anhydride grafted polymer.

Specifically, the aging inhibitor is not limited. In this embodiment, the anti-aging agent includes a UV327 ultraviolet absorber and a hindered phenol type antioxidant.

The addition of the anti-aging agent slows down the attenuation of various indexes of the core plate 2, so that the service life of the core plate 2 is prolonged, and the service life of the scraping plate is prolonged.

The preparation method of the composite scraping plate comprises the following steps:

specifically, step S100 includes preparing a prepreg of a fiber reinforced resin-based composite material using a bismaleimide resin, carbon fiber, PX200, erucamide, a mixture of a silane coupling agent and a maleic anhydride grafted polymer, a UV327 ultraviolet absorber, and a hindered phenol-based antioxidant;

s200, shaping, cutting, layering design and embedding;

s300, preparing a core plate 2 by compression molding;

specifically, step S300 includes heating, pressurizing and curing for 2-6h under the conditions that the temperature is 120-160 ℃ and the pressure is 5-15MPa to prepare the core plate 2 through compression molding.

More specifically, in the present embodiment, it is preferable that step S300 includes the preparation of the core plate 2 by press molding under heating and pressure curing for 6 hours at 160 ℃ and 15 MPa.

S400, the prepared core plate 2 is preset in a scraping plate die, and the outer layer of the core plate 2 is coated with a wear-resistant resin layer to prepare the scraping plate body 1.

Specifically, in step S400, the core plate prepared in step S300 is moved into a forming mold to cast ultra-high molecular weight high density polyethylene to form the blade body 1.

Specifically, step S400 includes melt temperature discrimination according to the kind of the resin used, and cooling molding at 60-85 ℃.

On one hand, the composite scraping plate prepared by the preparation method of the composite scraping plate is reduced by 20-25kg compared with a metal scraping plate assembly, and the effect of 57-71% weight reduction can be achieved; on the other hand, the prepared composite scraping plate has better strength, and the bending load of the composite scraping plate can reach 129.29-172.09kN; when the strength effect is best, the highest bending load reaches or even exceeds that of the scraping plate prepared by using the core plate 2 as a metal material and the scraping plate body 1 as a nonmetal material; in addition, the abrasion of the scraper conveyor and the connecting part of the scraper conveyor can be reduced, the energy consumption is saved by 60 percent for a user, and the production efficiency is improved by 60 percent.

Example 2

Unlike embodiment 1, in the present embodiment, the thermosetting resin includes polyurethane, epoxy resin, and vinyl resin.

The raw material of the reinforcement is glass fiber.

Example 3

Unlike example 1, in this example, the fiber reinforced resin-based composite material includes 50wt% of a resin matrix, 42wt% of a reinforcement, and 8wt% of a functional auxiliary agent.

The resin matrix is a thermoplastic resin, preferably, in this embodiment, the thermoplastic resin includes polyimide, high density polyethylene, and polyurethane.

In this example, the resin matrix has a melt mass flow rate of greater than 20g/10min under test conditions of a temperature of 230℃and a pressure of 2.165 Kg.

The raw materials of the reinforcement are glass fiber and quartz fiber.

The reinforcement is continuous fiber unidirectional cloth.

The functional auxiliary agent comprises a flame retardant and an antistatic agent.

Example 4

Unlike example 1, in this example, specifically, the fiber reinforced resin-based composite material includes 60wt% of a resin matrix, 35wt% of a reinforcing body, and 5wt% of a functional auxiliary agent.

Specifically, the resin matrix is a thermoplastic resin, and preferably, in this embodiment, the thermoplastic resin includes polytetrafluoroethylene, ultra-high molecular weight polyethylene, polyamide, and polyoxymethylene.

Specifically, the raw materials of the reinforcement are basalt fiber, aramid fiber and polyimide fiber.

Specifically, the reinforcement is a continuous fiber hybrid yarn.

Specifically, the functional auxiliary agent is a flame retardant, a lubricant and an interfacial activator.

Specifically, in this embodiment, the flame retardant is PX200; the lubricant is erucamide; the interfacial activator is a silane coupling agent.

Specifically, the raw material for preparing the scraper body 1 is polyurethane.

specifically, step S100 includes using polytetrafluoroethylene, ultra-high molecular weight polyethylene, polyamide, polyoxymethylene, basalt fiber, aramid fiber and polyimide fiber, PX200, erucamide and silane coupling agent to melt plasticize in a first-order planetary extruder, and then extruding at high speed through a second-order extruder to prepare the prepreg of the fiber reinforced resin matrix composite material.

S200, shearing and mixing by an extruder;

specifically, in step S200, the prepreg of step S100 is cut, and the residual length of the fiber in the composite material system is more than or equal to 35mm and accounts for more than half of the ratio;

s300, preparing a core plate 2 by online extrusion compression molding or online injection molding;

specifically, in step S300, the prepreg cut in step S200 is moved into a molding die which is precisely controlled in temperature and is placed in a fast compression molding machine or an injection molding machine to finish the fixed placement of the core plate 2 in advance for one-time compression molding, and then cooled, maintained in pressure and demoulded, and the next piece of composite scraping plate is subjected to online compression molding or injection molding.

S400, coating the wear-resistant resin layer on the outer layer of the core plate 2 to prepare the scraper body 1.

Specifically, in step S400, the core plate 2 prepared in step S300 is moved into a molding die to cast polyurethane to form the blade body 1.

On one hand, the composite scraping plate prepared by the preparation method of the composite scraping plate is reduced by 20-25kg compared with a metal scraping plate assembly, and the effect of 57-71% weight reduction can be achieved; on the other hand, the prepared composite scraping plate has better strength, and the bending load of the composite scraping plate can reach 129.29-151.09kN; in addition, the abrasion of the scraper conveyor and the connecting part of the scraper conveyor can be reduced, the energy consumption is saved by 60 percent for a user, and the production efficiency is improved by 80 percent.

Comparative example 1

Nonmetallic screed was prepared using the embodiment in CN 201510293692.8. (the nonmetallic scraper consists of a nonmetallic scraper body 1 and a metallic core plate 2).

Performance testing

Test example I, weight loss test

The composite squeegees prepared in examples 1 to 4 and the squeegees prepared in comparative example 1 were tested for weight, and the weight loss was calculated, and the specific experimental results are shown in table 1.

TABLE 1

Group of	Weight loss (%)
		Example 1	71
Example 2	68
		Example 3	64
Example 4	51
		Comparative example 1	29

As can be seen from Table 1, the composite screed and metal screed assemblies of examples 1-4 reduced 20-25kg, and a weight reduction of 57-71% was achieved. This is because the composite scrapers of examples 1 to 4 all adopt the core plate 2 made of the dimensional reinforced resin matrix composite material and the scraper body 1 made of the wear-resistant resin, and the weight is reduced from both the core plate 2 and the scraper body 1, thereby achieving a better weight reduction effect.

The blade and metal blade assembly of comparative example 1 reduced 10kg, and a weight reduction of 29% was achieved. This is because the blade of comparative example 1 uses only the blade body 1 made of a nonmetallic material instead of metal, and the weight reduction effect is poor from the aspect of the blade body 1.

Test example two, strength test

The composite blades prepared in examples 1 to 4 and the blade prepared in comparative example 1 were tested for bending load under the following experimental conditions: the blade is placed on the test stand and the MTS electrohydraulic servo tester (250T) is started to bring the ram into contact with the blade and test the bending load of the blade.

The specific experimental results are shown in table 2.

TABLE 2

Group of	Bending load (KN)
		Example 1	172.09
Example 2	151.10
		Example 3	148.04
Example 4	129.29
		Comparative example 1	170.02

As can be seen from Table 2, both the composite squeegees of examples 1-4 and the squeegees of comparative example 1 have better strength. The composite screed bending loads of examples 1-4 reached 129.29-172.09kN. Among them, the composite blade of example 1 had the best strength, and the bending load thereof reached 172.09kN, which exceeded that of the blade of comparative example 1. The bending load of the composite blade of example 1 > the bending load of the composite blade of example 3 > the bending load of the composite blade of example 4, which is closely related to the kind and content of the reinforcement in the composite blade of examples 1, 3 and 4. The bending load of the composite blade of example 1 > the bending load of the composite blade of example 2, which is closely related to the kind of reinforcement in the composite blade of examples 1, 2, the strength of the carbon fiber of example 1 is higher than that of the glass fiber of example 2. The blade strength of comparative example 1 is preferable because the core plate 2 thereof is a metal material.

2) According to the composite scraping plate and the preparation method, the prepared composite scraping plate has good strength, and the bending load of the composite scraping plate can reach 129.29-172.09kN; when the effect is best, the highest bending load reaches or even exceeds the scraping plate prepared by using the metal material as the core plate and using the nonmetal material as the scraping plate body.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. The composite scraping plate is characterized by comprising a core plate (2) and a scraping plate body (1), wherein the core plate (2) is arranged in the scraping plate body (1), and the preparation raw materials of the core plate (2) comprise fiber reinforced resin matrix composite materials; the preparation raw materials of the scraper blade body (1) are wear-resistant resin, the core plate (2) comprises a body (21) and end bodies (22) positioned at the left end and the right end of the body (21), a vertical joint surface (3) is arranged between the body (21) and the end bodies (22), the end bodies (22) are of wing-shaped arc-shaped shrinkage structures and shrink outwards from the vertical joint surface (3), the end bodies (22) comprise a first lower end surface (221), an included angle between the first lower end surface (221) and a horizontal plane is 0 degrees < A <5 degrees, and a first avoidance space (4) is arranged between the first lower end surface (221) and the body (21); the end body (22) comprises a tail cambered surface (225), a first upper end surface (223), an upper cambered surface (224), the vertical joint surface (3), a lower cambered surface (222) and a first lower end surface (221), wherein the tail cambered surface (225), the first upper end surface (223), the upper cambered surface (224), the vertical joint surface (3), the lower cambered surface (222) and the first lower end surface (221) are sequentially jointed end to form a closed body, and the lower cambered surface (222) is positioned above the first avoidance space (4); the included angle between the first upper end face (223) and the horizontal plane is 5 ° < B <15 °, the included angle between the tail cambered surface (225) and the first upper end face (223) is 45 ° < C <80 °, the included angle between the tail cambered surface (225) and the first lower end face (221) is 110 ° < D <160 °, the length of the tail cambered surface (225) is E, the height of the first avoiding space (4) is F, the width is G, the height of the vertical joint face (3) is H, the length of the first lower end face (221) is M, and the length of the first upper end face (223) is N, then e= (0.8-1.2) F, g= (1-1.5) F, h= (3-5) F, m= (5-8) F, n= (0.7-0.9) M.

2. The composite screed of claim 1, wherein the fiber reinforced resin-based composite comprises 25-60wt% resin matrix, 35-65wt% reinforcement, and 5-10wt% functional auxiliary agent.

3. The composite blade of claim 2 wherein the resin matrix is a thermosetting resin or a thermoplastic resin.

4. A composite screed according to claim 3, wherein the resin matrix is a thermosetting resin which is one or more of polyurethane, epoxy, vinyl, bismaleimide and polyimide resins.

5. A composite screed according to claim 3, wherein the resin matrix is a thermoplastic resin which is one or more of polyamide, high density polyethylene, polyurethane, polytetrafluoroethylene, ultra high molecular weight polyethylene, polyoxymethylene and polyimide.

6. The composite scraper of claim 2, wherein the raw material of the reinforcement is one or more of glass fiber, carbon fiber, quartz fiber, basalt fiber, aramid fiber and polyimide fiber.

7. The composite screed of claim 6, wherein the reinforcement is a continuous fiber unidirectional cloth or a continuous fiber fabric or a continuous fiber co-woven yarn.

8. The composite scraping plate according to claim 2, wherein the functional auxiliary agent is one or more of a flame retardant, an antistatic agent, a lubricant, an interfacial activator and an anti-aging agent.

9. A method for producing a composite screed according to any one of claims 1 to 8, comprising the steps of:

s200, shaping, cutting, layering design and embedding;

s300, preparing a core board (2) by compression molding;

s400, presetting the prepared core plate (2) in a scraping plate die, and coating the wear-resistant resin layer on the outer layer of the core plate (2) to prepare the scraping plate body (1).

10. A method for producing a composite screed according to any one of claims 1 to 8, comprising the steps of:

s100, preparing a fiber reinforced resin matrix composite material by using a resin matrix, a reinforcement and an auxiliary agent;

s200, melting, plasticizing, shearing and mixing by an extruder;

s300, preparing a core board (2) by online extrusion compression molding or online injection molding;

s400, coating the wear-resistant resin layer on the outer layer of the core plate (2) to prepare the scraper plate body (1).