阅读说明：本技术 一种矿井阻燃托辊用橡胶插板及其制备方法 (Rubber plug board for mine flame-retardant carrier roller and preparation method thereof ) 是由 刘益和 刘浩杰 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种矿井阻燃托辊用橡胶插板及其制备方法,属于复合材料加工领域。包括托辊,固定在所述托辊外表面上的向外凸起的镂空金属插板或向内凹陷的沟槽金属插板,以及通过粘结连接在所述金属插板上的橡胶层。本发明通过对连接方式做出了改进发明,在金属材料和橡胶材料界面之间添加一层镂空金属层,橡胶材料部分嵌合于镂空空间或网状凹槽中,形成自锁固定,有效的抵消在切向摩擦力的作用；另在常规的粘合剂基础上复合配予一定比例的硅烷偶联剂,让硅烷偶联剂的醇羟基与金属表面的自由基键合成牢固的硅氧键,提高了粘合剂与金属基体表面的结合力,大大减小了温度对粘合剂的影响。(The invention discloses a rubber inserting plate for a mine flame-retardant carrier roller and a preparation method thereof, and belongs to the field of composite material processing. The support roller comprises a support roller, an outwards-convex hollow metal inserting plate or an inwards-concave groove metal inserting plate fixed on the outer surface of the support roller, and a rubber layer connected to the metal inserting plate through bonding. The invention improves the connection mode, a hollow metal layer is added between the interface of the metal material and the rubber material, and the rubber material is partially embedded in the hollow space or the reticular groove to form self-locking fixation, thereby effectively offsetting the action of tangential friction force; in addition, a certain proportion of silane coupling agent is compounded and matched on the basis of the conventional adhesive, so that the alcoholic hydroxyl group of the silane coupling agent and the free radical bond on the metal surface are combined into a firm silicon-oxygen bond, the bonding force between the adhesive and the metal matrix surface is improved, and the influence of temperature on the adhesive is greatly reduced.)

1. The utility model provides a fire-retardant rubber picture peg for bearing roller of mine which characterized in that, including: the support roller comprises a support roller, an outwards-protruded hollow metal inserting plate or an inwards-sunken groove metal inserting plate fixed on the outer surface of the support roller, and a rubber layer connected to the metal inserting plate through bonding.

2. The rubber inserting plate for the mine flame-retardant carrier roller as claimed in claim 1, wherein the metal inserting plate is a steel plate with surface roughness of SP3, SP4, SP5 and SP6 grades.

3. The rubber inserting plate for the mine flame-retardant carrier roller as claimed in claim 1, wherein the hollowed-out metal inserting plate is formed by welding a metal hollowed-out layer of a net structure on a metal plate through a spot welding process to obtain a metal surface of the net structure.

4. The mine flame-retardant roller rubber inserting plate as claimed in claim 3, wherein a hollowed space is formed between the hollowed metal inserting plate and the rubber layer, and the area of the contact surface of the hollowed space and the metal plate is larger than the contact surface of the hollowed space and the rubber layer.

5. The mine flame-retardant idler rubber inserting plate as claimed in claim 4, wherein the hexagonal table body is provided with a hollowed-out space, and the cotangent value of the bottom corner of the table body is larger than the difference between the thermal expansion coefficient of the rubber and the thermal expansion coefficient of the metal plate.

6. The rubber inserting plate for the mine flame-retardant carrier roller as claimed in claim 1, wherein the proportion of the total area of the hollowed-out spaces to the total area is 15-22.5%.

7. The rubber inserting plate for the mine flame-retardant carrier roller as claimed in claim 1, wherein the rubber protective layer is made of nitrile rubber as a main material and comprises the following components in parts by mass: 90-100 parts of nitrile rubber, 5-10 parts of chloroprene rubber, 5-6 parts of a dispersing agent, 10-20 parts of a flame retardant, 13.5 parts of N330 carbon black, 0.4 part of an accelerator, 1 part of an anti-aging agent, 2-5 parts of a curing agent, 8 parts of a vulcanizing agent, 5-6 parts of a softener and 5-6 parts of liquid coumarone resin.

8. The rubber insert plate for the mine flame-retardant carrier roller as claimed in claim 1, wherein the binder comprises the following components in percentage by mass in total solids: 50-70 parts of polyurethane resin, 10-20 parts of chlorinated polyethylene, 1-3 parts of a flame retardant, 10-20 parts of a silane coupling agent A-151 and 1-5 parts of cobalt oxide.

9. A preparation method of a rubber inserting plate for a mine flame-retardant carrier roller is characterized by comprising the following steps:

step one, a metal plate is used as a weldment, and the hollow metal layers of the net structure are used as connectors and are connected together through a spot welding process;

firstly, degreasing and cleaning the surface of the metal plate by using an oil ester cleaning agent, and then cleaning the metal plate by using a high-pressure water gun to remove the cleaning agent and other pollutants on the surface of the metal plate;

step three, drying the metal plate, and then dip-coating an adhesive on the metal surface, wherein the adhesive comprises the following components in parts by mass: 50-70 parts of polyurethane resin, 10-20 parts of chlorinated polyethylene, 1-3 parts of a flame retardant, 10-20 parts of a silane coupling agent A-151 and 1-5 parts of cobalt oxide;

step four, mixing the nitrile rubber according to the formula ratio, and mixing the nitrile rubber by using an internal mixer, wherein the ratio is as follows: 90-100 parts of nitrile rubber, 5-10 parts of chloroprene rubber, 5-6 parts of a dispersing agent, 10-20 parts of a flame retardant, 13.5 parts of N330 carbon black, 0.4 part of an accelerator, 1 part of an anti-aging agent, 2-5 parts of a curing agent, 8 parts of a vulcanizing agent, 5-6 parts of a softener and 5-6 parts of liquid coumarone resin;

step five, uniformly coating the nitrile rubber compound on the adhesive, standing and drying;

and step six, finally, carrying out vulcanization operation in a large-scale flat vulcanizing machine, wherein the vulcanization temperature is 145-170 ℃, the vulcanization pressure is 16-18 MPa, and the vulcanization time per mold is 6-9 min.

Technical Field

The invention belongs to the field of composite material processing, and particularly relates to a rubber insert plate for a mine flame-retardant carrier roller and a preparation method thereof, which can also be used on belt conveying systems in other industries.

Background

Belt conveyors are currently used as the primary transport tool in mine mining. Only the coal industry of China consumes 500 ten thousand sets of carrier rollers every year. In order to increase the friction force of the carrier roller, a layer of rubber material is coated on the surface of the carrier roller so as to improve the friction force of the carrier roller. Considering the difficulty degree of the overall rubber coating process of the carrier roller and the convenience of later maintenance, most of the existing enterprises can arrange annular arrays of rubber sheets on the outer surface of the carrier roller, a plurality of rubber inserting plates are arranged on the circumferential surface of the carrier roller in an annular array mode in a detachable connection mode, pressing strips are arranged between every two adjacent rubber inserting plates, and two ends of each pressing strip are welded on the end surface of the roller.

However, the products still have certain problems in the actual use process, and because the mine is in a severe environment, the rolling bearing is easy to be corroded or clamped by foreign matters, and the corresponding carrier roller is often blocked. If a plurality of carrier roller clamping shafts on the same conveyor do not rotate, sliding friction is formed between the belt and the carrier rollers, so that the transmission resistance of the belt is increased, the friction is increased, the temperature of the rubber inserting plate is increased rapidly, and heat generation and even combustion are generated in severe cases. At present, people have made a relatively deep research and achieved good results in the research of flame retardant materials, and can avoid the carrier roller spontaneous combustion phenomenon. However, most of carrier roller shaft clamping phenomena cannot directly achieve the self-ignition effect, the temperature of the insert plate is increased rapidly, the rubber material is expanded thermally, the interface between the rubber material and the metal material is separated or is separated, the rubber material is stripped from the insert plate under the action of tangential friction force, and the separated rubber material can cause a new carrier roller shaft clamping phenomenon.

Disclosure of Invention

The purpose of the invention is as follows: the rubber inserting plate for the mine flame-retardant carrier roller is provided to solve the problems related in the background technology. The damaged rubber surface can be quickly replaced without detaching the carrier roller, the integrity of the rubber material coated on the surface of the carrier roller is kept, and the friction force is continuously provided.

The technical scheme is as follows: the invention provides a rubber plugboard for a mine flame-retardant carrier roller, which comprises: the support roller comprises a support roller, an outwards convex hollow metal inserting plate or an inwards concave groove metal inserting plate fixed on the outer surface of the support roller, and a rubber layer connected to the metal inserting plate through a bonding agent.

Preferably, the metal insert plate is a steel plate with surface roughness of SP3, SP4, SP5 and SP6 grades.

As a preferred scheme, the hollowed-out metal inserting plate is a net-shaped structure obtained by welding a metal hollowed-out layer with a net-shaped structure on a metal plate through a spot welding process.

As a preferable scheme, a hollow space is formed between the hollow metal inserting plate and the rubber layer, and the area of the contact surface of the hollow space and the metal plate is larger than the contact surface of the hollow space and the rubber layer.

Preferably, the hexagonal table body is provided with a hollowed-out space, and the cotangent value of the bottom corner of the table body is greater than the difference between the thermal expansion coefficient of the rubber and the thermal expansion coefficient of the metal plate.

As a preferable scheme, the total area of the hollowed-out spaces accounts for 15-22.5% of the total area.

As a preferred scheme, the rubber protective layer takes nitrile rubber as a main material and comprises the following components in parts by mass: 90-100 parts of nitrile rubber, 5-10 parts of chloroprene rubber, 5-6 parts of a dispersing agent, 10-20 parts of a flame retardant, 13.5 parts of N330 carbon black, 0.4 part of an accelerator, 1 part of an anti-aging agent, 2-5 parts of a curing agent, 8 parts of a vulcanizing agent, 5-6 parts of a softener and 5-6 parts of liquid coumarone resin.

As a preferred embodiment, the binder comprises the following components in percentage by mass in total solids: 50-70 parts of polyurethane resin, 10-20 parts of chlorinated polyethylene, 1-3 parts of a flame retardant, 10-20 parts of a silane coupling agent A-151 and 1-5 parts of cobalt oxide.

The invention also provides a preparation method of the rubber inserting plate for the mine flame-retardant carrier roller, which comprises the following steps:

step one, a metal plate is used as a weldment, and the hollow metal layers of the net structure are used as connectors and are connected together through a spot welding process;

firstly, degreasing and cleaning the surface of the metal plate by using an oil ester cleaning agent, and then cleaning the metal plate by using a high-pressure water gun to remove the cleaning agent and other pollutants on the surface of the metal plate;

step three, drying the metal plate, and then dip-coating an adhesive on the metal surface, wherein the adhesive comprises the following components in parts by mass: 50-70 parts of polyurethane resin, 10-20 parts of chlorinated polyethylene, 1-3 parts of a flame retardant, 10-20 parts of a silane coupling agent A-151 and 1-5 parts of cobalt oxide;

step four, mixing the nitrile rubber according to the proportion, and mixing the nitrile rubber by an internal mixer, wherein the proportion is as follows: 90-100 parts of nitrile rubber, 5-10 parts of chloroprene rubber, 5-6 parts of a dispersing agent, 10-20 parts of a flame retardant, 13.5 parts of N330 carbon black, 0.4 part of an accelerator, 1 part of an anti-aging agent, 2-5 parts of a curing agent, 8 parts of a vulcanizing agent, 5-6 parts of a softener and 5-6 parts of liquid coumarone resin;

step five, uniformly coating the nitrile rubber compound on the adhesive, standing and drying;

and step six, finally, carrying out vulcanization operation in a large-scale flat vulcanizing machine, wherein the vulcanization temperature is 145-170 ℃, the vulcanization pressure is 16-18 MPa, and the vulcanization time per mold is 6-9 min.

Has the advantages that: the invention relates to a rubber inserting plate for a mine flame-retardant carrier roller, which is improved in a connection mode.A hollow metal layer is additionally arranged on an interface between a metal material and a rubber material, and the rubber material is partially embedded in a hollow space or a reticular groove to form self-locking fixation so as to effectively counteract the action of tangential friction force; the silane coupling agent is compounded and matched on the conventional adhesive in a certain proportion, and the alcoholic hydroxyl group of the silane coupling agent and the free radical bond on the metal surface are synthesized into a firm silicon-oxygen bond, so that the bonding force between the adhesive and the surface of the metal substrate is improved, and the influence of temperature on the adhesive is greatly reduced. The invention also provides a new method for directly replacing the carrier roller without dismounting when the carrier roller is damaged by using the belt conveyor. Thereby improving the efficiency, prolonging the service life of the carrier roller of the conveyor and being beneficial to reducing the economic cost.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

Because the mine is in a severe environment, the rolling bearing is easy to be corroded or clamped by foreign matters, and the corresponding carrier roller is often clamped. If a plurality of carrier roller clamping shafts on the same conveyor do not rotate, sliding friction is formed between the belt and the carrier rollers, so that the transmission resistance of the belt is increased, the friction is increased, the temperature of the rubber inserting plate is increased rapidly, and heat generation and even combustion are generated in severe cases. At present, people have made a relatively deep research and achieved good results in the research of flame retardant materials, and can avoid the carrier roller spontaneous combustion phenomenon. However, most of carrier roller shaft clamping phenomena cannot directly achieve the self-ignition effect, the temperature of the insert plate is increased rapidly, the rubber material is subjected to thermal expansion, so that the rubber material and the metal material are separated or have a separation tendency, the rubber material is stripped from the insert plate under the action of tangential friction force, and the separated rubber material can also cause a new carrier roller shaft clamping phenomenon.

On one hand, the invention improves the connection mode, a layer of hollow metal layer is additionally arranged between the metal material and the rubber material, and the specific inserting plate comprises: the support roller comprises an outwards convex hollow metal insertion plate or an inwards concave groove metal insertion plate fixed on the outer surface of the support roller, and a rubber layer connected to the metal insertion plate through bonding.

In a further implementation, the metal insert plate is a steel plate with surface roughness of grade SP3, SP4, SP5, SP 6. The surface treatment processes such as sand blasting, shot blasting and the like are mainly utilized to enable the surface of the material to be rougher, and after the surface treatment, a large number of molecular free radicals can be formed on the surface of the material, so that the degree of crosslinking of the material reacting with the adhesive is increased, and the adhesive bonding strength of the inserting plate is improved.

In the further implementation process, the hollowed-out metal inserting plate is a net-shaped structure obtained by welding the metal hollowed-out layer of the net-shaped structure on the metal plate through a spot welding process. Similarly, the groove metal inserting plate is provided with a layer of concave reticular grooves which are printed on the surface of the metal plate. After the surface of the metal plate is coated with the rubber material, the rubber material is partially embedded in the hollow space or the reticular groove to form self-locking fixation, and the effect of tangential friction force is effectively counteracted. When the rubber material is heated rapidly and thermally expands, the rubber material expands towards the hollow space or the reticular groove, so that the self-locking effect is enhanced, and the connection strength of the rubber inserting plate is improved. It should be noted that, in general, the welding strength is much greater than the bonding strength, so in the present invention, the strength of the metal hollow layer is not described too much.

After further invention research, when the area of the contact surface of the hollow space and the metal plate is larger than the contact surface of the hollow space and the rubber layer. Particularly, when the hollowed-out space is honeycomb-shaped, the cross section of the hollowed-out space is a hexagonal table body, and the cotangent value of the bottom angle of the table body is greater than the difference between the thermal expansion coefficient of the rubber and the thermal expansion coefficient of the metal plate. Similarly, when the cross section of the hollow groove is trapezoidal, and the cotangent value of the bottom angle of the trapezoid is greater than the difference between the thermal expansion coefficient of the rubber and the thermal expansion coefficient of the metal plate. In practice, the coefficient of thermal expansion of the metal plate is negligible. When the rubber material is partially embedded in the hollow space or the reticular groove, self-locking fixation is formed, and tangential acting force is effectively counteracted. When the rubber material is heated rapidly and thermally expands, the rubber material expands towards the hollow space or the mesh groove, so that the self-locking effect is enhanced, and the connection strength of the rubber inserting plate is improved.

On the other hand, because the rubber material is connected with the metal inserting plate differently from mechanical connection and welding, the adhesive is needed to be used between the connected parts for adhesive bonding, and the rubber inserting plate has the advantages of high connection efficiency, light structural mass, high fatigue resistance and the like. However, the adhesive in the market is sensitive to temperature and humidity, the bonding process is easy to fail and damage under a high-temperature or humid environment, the damage mode is instant cracking, and the bearing capacity is lost instantly after the adhesive fails. When the 'shaft clamping' phenomenon occurs to the carrier roller, the high-temperature environment of the rubber material can cause the adhesive bonding effect of the existing adhesive to be greatly reduced. In order to reduce the influence of temperature on the adhesive, the silane coupling agent is compounded on the conventional adhesive in a certain proportion, the alcoholic hydroxyl group of the silane coupling agent and the free radical bond on the metal surface are combined into a firm silicon-oxygen bond, the bonding force between the adhesive and the metal matrix surface is improved, the Si-O-Si bond is formed by condensation of the silanol, the adhesive has good heat resistance, and the influence of the temperature on the adhesive is greatly reduced. In addition, rubber is wrapped and embedded outside the hollow space to form another connection mode, so that the temperature is not easily influenced.

The rubber material adopts nitrile rubber and chloroprene rubber which have high wear resistance, good heat resistance and fire resistance and strong bonding force, and the specific formula comprises the following components in parts by mass: 90-100 parts of nitrile rubber, 5-10 parts of chloroprene rubber, 5-6 parts of a dispersing agent, 10-20 parts of a flame retardant, 13.5 parts of N330 carbon black, 0.4 part of an accelerator, 1 part of an anti-aging agent, 2-5 parts of a curing agent, 8 parts of a vulcanizing agent, 5-6 parts of a softener and 5-6 parts of liquid coumarone resin.

In addition, the addition of a small amount of a metal oxide having an adhesion-promoting effect, such as cobalt oxide, to the silane coupling agent increases the reaction of the silane component with the adhesive, and the rubber component can be effectively adhered to the metal surface. Since the initial adhesion property between the rubber composition and the adherend is high, by adding an adhesion promoter of cobalt oxide or the like (zinc oxide) in the rubber composition to the adhesive, reducing the content of the adhesion promoter of cobalt oxide, zinc oxide or the like in the rubber component, it is possible not only to improve the heat-resistant adhesion between the rubber composition and the metal plate but also to avoid reversion and improve the aging resistance of the rubber.

The invention will now be further described with reference to the following examples, which are intended to illustrate the invention and are not to be construed as limiting the invention