Smash-resistant conveyor belt

Abstract

The invention discloses a smash-resistant conveyor belt, which belongs to the technical field of conveyor belts, and comprises an upper covering layer, a lower covering layer, a skeleton layer and an edge rubber layer; the upper covering layer and the lower covering layer adopt a tear strength of ≥120N / mm and a wear of ≤80mm. 3 , rebound rate ≥ 25% of the rubber compound; the skeleton layer is made of canvas, the warp twist of the canvas is 5 twists / 10cm, the elongation at break is ≥18%, the curling rate is ≥5%, the weft twist is 10 twists / 10cm, the density is 75±2 roots / 10cm, the average breaking strength is ≥155N / mm, the minimum breaking strength is ≥145N / mm, 10% fixed load elongation is ≥5%; the skeleton layer is bonded with adhesive rubber with a rebound rate of ≥25%, a hardness of ≤50IRHD, and a thickness of ≥1.3mm. This kind of smash-resistant conveyor belt improves the kinetic energy absorption and buffering capacity of the covering layer, improves the smash-resistant, wear-resistant and tear-resistant performance; improves the longitudinal elasticity and transverse elasticity, strength, elongation, tearing force, and impact strength of the skeleton layer; improves the kinetic energy absorption and buffering capacity of the skeleton layer, and extends the operating life of the conveyor belt to more than 2.5 times.

Description

Technical Field

[0001] The invention belongs to the technical field of conveyor belts, and in particular relates to a smash-resistant conveyor belt. Background Art

[0002] Conveyor belts are suitable for the transportation of powdered and bulk materials between various processes and sections. They are convenient, fast and have high production efficiency. They are a necessary means for continuous transportation of batch materials in modern large-scale production.

[0003] The existing conveyor belt consists of an upper covering layer, a skeleton layer, a lower covering layer and side rubber layers on both sides of the skeleton layer. The upper covering layer and the lower covering layer are made of rubber. The skeleton layer of the belt is the strong layer of the belt, which bears the main pulling force during the operation of the belt. The upper and lower covering rubbers play a role in protecting the skeleton layer. In the process of stone mining, cement plant ore feed port, limonite screening, etc., due to the high material density, sharp shape, large conveying volume, high linear speed, large drop, etc., higher requirements are put forward for the impact resistance, tear resistance, and wear resistance of the covering layer and the skeleton layer. Therefore, how to improve the smash resistance of the conveyor belt is an important indicator for the design of this belt.

[0004] Through the statistics of tape users' usage over the years, the following parameters are obtained:

[0005] (1) The upper covering layer (working surface), in addition to protecting the frame, mainly plays the role of receiving materials, bearing weight and buffering. It is subject to material impact, relative movement friction, scratches, bending, etc. When the damage to the frame layer is very small, its durable life represents the life of the belt.

[0006] (2) The lower covering layer (non-working surface) mainly plays the role of protecting the skeleton and buffering, and at the same time bears the friction and flexure of the roller, which is mainly manifested in the wear phenomenon that occurs in the contact part with the roller.

[0007] (3) Skeleton layer: Currently, EP200 dipped canvas is the main material. Skeleton layers of different strengths are formed by stacking according to different needs of users. Skeleton layers account for about 70% of the total canvas consumption of the skeleton layer of the layered conveyor belt. Under normal circumstances, it is produced according to GB / T7984 standard, and its warp curl rate is only 3.5% at most. With the intensified competition within the industry and the lack of indicator assessment, some manufacturers produce products with a curl rate of only 2%. The warp elasticity of the belt is seriously insufficient and cannot withstand the violent impact of the material. Some products break after being impacted by the material several times in a very short time, resulting in the breakage of the belt and suspension of production. At the same time, due to the lack of transverse assessment indicators, the transverse strength of a single-layer canvas is only 50-75N / mm, the transverse strength of 4 layers of canvas is only 200-300N / mm, and the transverse strength of 5 layers of canvas is only 250-350N / mm. It is completely unable to meet the relevant process requirements of mines, cement plants, limonite mines and other enterprises.

[0008] The existing GB / T7984-2013 tape standard can no longer meet its requirements. Its covering rubber only stipulates conventional requirements such as tensile strength, elongation at break, abrasion, etc., but does not stipulate indicators such as the tearing performance and impact elasticity of the rubber; the skeleton layer only stipulates requirements such as warp strength and warp elongation, but does not stipulate requirements such as warp curl, transverse strength, and transverse elongation of the skeleton layer. As a result, after sharp objects fall from a high altitude, they impact the conveyor belt and cause the tape to tear laterally; relatively speaking, the skeleton layer is made of fiber, and its rigidity is much higher than that of rubber, and its ability to absorb kinetic energy is relatively weak. After market surveys and user visits, it was found that the covering rubber was torn, worn, had holes, and the skeleton was longitudinally torn, causing the tape to be damaged and need to be replaced after a short period of use. To address such problems and meet user product usage requirements, the conveyor belt needs to be improved.

[0009] In order to overcome the above-mentioned shortcomings, the inventor has specially developed a crush-resistant conveyor belt, and this case is thus generated. Summary of the invention

[0010] The purpose of the present invention is to provide a smash-resistant conveyor belt, by changing the tear resistance, impact resistance, wear resistance and other properties of the rubber material used in the covering layer, the smash resistance of the covering layer is improved; by changing the weaving structure of the skeleton layer, the longitudinal elasticity, weft elasticity, weft strength and other properties of the skeleton layer are improved; by increasing the bonding strength between the skeleton layer cloth layers, the thickness of the bonding rubber layer, and the elasticity of the bonding rubber layer, the kinetic energy absorption capacity of the skeleton layer is improved; that is, by improving the covering layer, the skeleton layer and the bonding of the skeleton layer, the purpose of increasing the service life of the conveyor belt is achieved.

[0011] In order to achieve the above object, the solution of the present invention is:

[0012] A smash-resistant conveyor belt, comprising an upper covering layer, a lower covering layer, a skeleton layer located between the upper covering layer and the lower covering layer, and edge rubber layers located at both ends of the upper covering rubber layer, the skeleton layer and the lower covering layer; the upper covering layer and the lower covering layer adopt tear strength ≥ 120N / mm and abrasion ≤ 80mm 3 , the skeleton layer is made of rubber with a rebound rate ≥25%; the skeleton layer is made of canvas with a warp twist of 5 twists / 10cm, an elongation at break ≥18%, a curl ≥5%, a weft twist of 10 twists / 10cm, a density of 75±2 strands / 10cm, an average breaking strength ≥155N / mm, a minimum breaking strength ≥145N / mm, and an elongation at 10% fixed load ≥5%.

[0013] The canvas used in the skeleton layer is weft-reinforced EP200, the warp material of which is polyester filament and the weft material is nylon 66 filament.

[0014] The skeleton layer is bonded by using an adhesive material with a rebound rate of ≥25%, a hardness of ≤50IRHD, and a thickness of ≥1.3mm.

[0015] The rubber materials used in the upper and lower covering layers are as follows in terms of mass ratio:

[0016]

[0017] The above-mentioned natural rubber adopts No. 2 natural rubber, and the styrene-butadiene rubber adopts 1502 styrene-butadiene rubber.

[0018] The rubber materials used in the upper and lower covering layers are as follows in terms of mass ratio:

[0019]

[0020] After adopting the above scheme, the present invention has the following advantages compared with the prior art:

[0021] (1) By increasing the tear strength assessment index of the rubber material, the tear strength is increased from about 25N / mm for general rubber materials (usually not assessed or tested) to ≥120N / mm, and the wear is reduced from 120mm 3 Increase to ≤80mm 3 The rebound rate is increased from about 10% of general rubber (usually not evaluated or tested) to ≥25%, thereby improving the kinetic energy absorption capacity, impact resistance, wear resistance and smash resistance of the covering layer;

[0022] (2) By increasing the twist of the warp in the skeleton layer and increasing the number of weft strands (increasing the diameter of the weft), and adjusting the warp tension appropriately according to different loom conditions, the warp curl and warp elasticity are increased, thereby improving the warp impact resistance of the skeleton layer;

[0023] (3) By increasing the number of parallel strands and the diameter of the wefts in the skeleton layer, the density of the wefts is increased, thereby significantly improving the weft strength and weft impact resistance;

[0024] (4) By increasing the twist of the weft yarn of the skeleton layer, the weft elongation under fixed load and the weft elasticity of the tape are increased, thereby improving the resistance of the skeleton layer to impact;

[0025] (5) By improving the bonding performance between the skeleton layer fabric layers and bonding them with an adhesive having a rebound rate ≥ 25%, a hardness ≤ 50IRHD, and a thickness ≥ 1.3 mm (taking EP200 as an example), the kinetic energy absorption capacity and flexural performance of the skeleton layer are improved.

[0026] The above improvements can be achieved by making slight improvements to the canvas production line, mainly adjusting the twist of the doubling machine and the warp tension, weft density, weft pressure tension, etc. on the loom, and no new production process is involved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of the smash-resistant conveyor belt of the present invention. DETAILED DESCRIPTION

[0028] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the present invention provides a smash-resistant conveyor belt, comprising an upper covering layer 1, a lower covering layer 4, a skeleton layer 2 located between the upper covering layer 1 and the lower covering layer 4, and an edge rubber layer 3 located at both ends of the upper covering rubber layer 1, the skeleton layer 2 and the lower covering layer 4; the upper covering layer 1 and the lower covering layer 4 adopt a tear strength of ≥120N / mm and a wear of ≤80mm 3 , and the rebound rate is ≥25%; the skeleton layer 2 is made of canvas, the warp twist of the canvas is 5 twists / 10cm, the elongation at break is ≥18%, the curling rate is ≥5%, the weft twist is 10 twists / 10cm, the density is 75±2 roots / 10cm, the average breaking strength is ≥155N / mm, the minimum breaking strength is ≥145N / mm, and the 10% fixed load elongation is ≥5%. In this embodiment, the canvas used in the skeleton layer 2 is the weft-reinforced EP200, the warp material is polyester filament, and the weft material is nylon 66 filament; and the bonding of the skeleton layer 2 is bonded with a bonding adhesive with a rebound rate ≥25%, a hardness ≤50IRHD, and a thickness ≥1.3mm (taking EP200 as an example).

[0030] The canvas weaving structure and parameters used in the above-mentioned skeleton layer 2 are compared with the existing canvas as shown in Table 1:

[0031] Table 1 Comparison between the EP200 canvas of the present invention and the HG / T2820 standard

[0032]

[0033]

[0034] It can be seen that the present invention, with respect to the skeleton layer 2, increases the twist of the warp threads, increases the number of weft threads (increases the diameter of the weft threads), and appropriately adjusts the warp tension according to different loom conditions, thereby increasing the warp curl and warp elasticity, thereby improving the warp impact tolerance; increases the number of weft threads and the weft diameter, thereby increasing the weft density, thereby greatly improving the weft strength and weft impact tolerance; increases the twist of the weft threads, thereby increasing the weft elongation under fixed load and the weft elasticity of the tape, thereby improving the tape's tolerance to impact; and increases the bonding strength of the skeleton layer and the thickness of the cloth layer adhesive, thereby improving the skeleton layer's ability to absorb kinetic energy.

[0035] Preferably, the rubber material used in the upper cover layer 1 and the lower cover layer 4 is as follows, by mass ratio: natural rubber 50-60, styrene-butadiene rubber 5-15, BR9000 butadiene rubber 30-40, 600 mesh sulfur powder 1.4-1.7, accelerator NOBS 0.8-1.1, 99.5% zinc oxide 5-7, secondary industrial stearic acid 1.5-2, solid coumarone 1.5-3, antioxidant 4010NA 1.75-2, antioxidant TMQ 1.25-1.75, antioxidant 6PPD 0.5-1, microcrystalline wax 0.8-1.0, N110 carbon black 30-35, N220 carbon black 10-20, N330 carbon black 5-10, the specific formula is as shown in Table 2:

[0036] Table 2 Rubber compound formula

[0037]

[0038]

[0039] The tear strength of the rubber compound using the above formula is increased from about 25N / mm (usually not evaluated or tested) to ≥120N / mm. 3 Increase to ≤80mm 3 The impact elasticity is increased from about 10% of general rubber materials (usually not evaluated or tested) to ≥25%, thereby improving the kinetic energy absorption capacity, impact resistance, wear resistance and smash resistance of the covering layer.

[0040] The present invention is compared with the GB / T7984 standard assessment indicators, as shown in Table 3 below:

[0041] Table 3 Conveyor belt assessment index comparison

[0042]

[0043]

[0044] In summary, compared with the prior art, the present invention increases the assessment index of the rubber material of the conveyor belt covering layer, improves the kinetic energy absorption capacity of the covering layer, as well as the smashing resistance, wear resistance and tear resistance of the rubber material; at the same time, it improves the weaving structure of the skeleton layer 2 material (canvas), improves the longitudinal elasticity and transverse elasticity, strength, elongation, tear force and impact strength of the skeleton layer canvas, thereby improving the smashing resistance of the skeleton layer; improves the bonding performance of the skeleton layer, and increases the bonding requirements. Through these improvements, the operating life of the conveyor belt is extended to more than 2.5 times, thereby reducing the material transportation cost and improving the production and economic benefits of users.

[0045] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A smash-resistant conveyor belt, comprising an upper covering layer, a lower covering layer, a skeleton layer located between the upper covering layer and the lower covering layer, and edge rubber layers located at both ends of the upper covering rubber layer, the skeleton layer and the lower covering layer; Features: The upper covering layer and the lower covering layer are made of rubber with tear strength ≥120N / mm, abrasion ≤80mm3, and rebound rate ≥25%; the skeleton layer is made of canvas with warp twist of 5 twists / 10cm, elongation at break ≥18%, curling rate ≥5%, weft twist of 10 twists / 10cm, density of 75±2 strands / 10cm, average breaking strength ≥155N / mm, minimum breaking strength ≥145N / mm, and 10% fixed load elongation ≥5%; The canvas used in the skeleton layer is weft-reinforced EP200, the warp material of which is polyester filament, and the weft material is nylon 66 filament; The skeleton layer is bonded with an adhesive having a rebound rate of ≥25%, a hardness of ≤50IRHD, and a thickness of ≥1.3mm; The rubber materials used to prepare the upper cover layer and the lower cover layer are as follows in terms of mass ratio: Natural rubber: 50-60, styrene-butadiene rubber: 5-15 BR9000 butadiene rubber: 30-40, 600 mesh sulfur powder: 1.4-1.7 Accelerator NOBS: 0.8-1.1, 99.5% zinc oxide: 5-7 Secondary industrial stearic acid: 1.5-2, solid coumarone: 1.5-3 Antioxidant 4010NA: 1.75-2, Antioxidant TMQ: 1.25-1.75 Antioxidant 6PPD: 0.5-1, microcrystalline wax: 0.8-1.0 N110 carbon black: 30-35, N220 carbon black: 10-20 N330 carbon black: 5-10.

2. The smash-resistant conveyor belt according to claim 1, Features: The natural rubber is No. 2 natural rubber, and the styrene-butadiene rubber is 1502 styrene-butadiene rubber.

3. The smash-resistant conveyor belt according to claim 2, Features: The rubber materials used to prepare the upper cover layer and the lower cover layer are as follows in terms of mass ratio: No. 2 natural rubber: 50, 1502 styrene-butadiene rubber: 10 BR9000 butadiene rubber: 40, 600 mesh sulfur powder: 1.5 Accelerator NOBS: 0.8, 99.5% Zinc oxide: 5 Secondary industrial stearic acid: 2, solid coumarone: 1.5 Antioxidant 4010NA: 2, Antioxidant TMQ: 1.5 Antioxidant 6PPD: 0.5, Microcrystalline wax: 1.0 N110 carbon black: 35, N220 carbon black: 15 N330 carbon black:5.

Images