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整芯阻燃输送带与哪些因素有关?

来源: 时间:2020-08-28 16:35:58 浏览次数:
整芯输送带利用阻燃的PVC包织纤维达到了阻燃的目的。PVC的粘接性能比较差,层间粘接困难,因此需要将纤维织成一体。为了使整个编织芯的内部充满PVC膏,带芯不应该编得很紧,因此传送带的张力均匀性是通过浸渍PVC膏,初步塑化后拉伸来实现的,从而使整芯传送带具有以下先天性的弱点。
The whole core conveyor belt uses flame retardant PVC wrapped fiber to achieve the purpose of flame retardant. Because of the poor adhesion of PVC and the difficulty of adhesion between layers, it is necessary to weave the fibers into one. In order to make the whole braided core filled with PVC paste, the belt core should not be woven very tightly. Therefore, the tension uniformity of the conveyor belt is realized by dipping PVC paste and stretching after initial plasticization, so that the whole core conveyor belt has the following congenital weaknesses.
(a)PVC浆料与化学纤维的粘接性差,两者不能成为力学整体,应力分散差,是整芯输送带的结构损伤和寿命短的根本原因。但是,如果PVC膏能够通过塑化形成完全的连续均匀相,则骨架和塑料的应力应变的协同性变好,输送带的强度和疲劳寿命也变好。例如,英国的芬纳企业制造的阻燃整芯输送机,两三年后骨架基本完整,而国内的一部分中小厂商制造的整芯输送机,在一年左右骨架就被松动破坏了。修订上的先天不足使整芯输送机的生产技术和技术掌握微妙,采用相同的原料、相同的技术和设备,不一定能生产出相同质量的产品。
(a) The poor adhesion between PVC slurry and chemical fiber, the two can not become a mechanical whole, and the stress dispersion is poor, which is the fundamental reason for the structural damage and short service life of the whole core conveyor belt. However, if the PVC paste can be plasticized to form a complete continuous homogeneous phase, the stress-strain coordination between the skeleton and the plastic will be better, and the strength and fatigue life of the conveyor belt will also be improved. For example, the frame of flame retardant whole core conveyor made by Fenner company in England is basically complete after two or three years, while the framework of some small and medium-sized manufacturers in China is loose and damaged in about a year. The inherent deficiencies in the revision make the production technology and technology of the whole core conveyor subtle. Using the same raw materials, the same technology and equipment, the same quality products may not be produced.
(b)PVC硬度大,柔软性差,几乎没有缓冲作用,整芯输送带耐冲击性差,容易发生外伤性损伤。
(b) PVC has high hardness, poor flexibility, almost no buffering effect, poor impact resistance of the whole core conveyor belt, and easy to cause traumatic damage.
(c)由于带芯的织造结构比较松弛、捻度低、变形能力强的棉纱占有一定的空间,所以即使经过成形拉伸,带芯整体的张力也难以一致,塑化后的带芯松弛是不可避免的。这是在一段时间使用了很多整芯传送带之后产生荷叶边状松弛的主要原因,也是传送带容易弯曲的原因。当然,在传送带上出现荷叶边缘的根本原因是化学纤维自身具有的高增长率。
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(c) Because the weaving structure of the core is relatively loose, the cotton yarn with low twist and strong deformation capacity occupies a certain space, so even after forming and stretching, the overall tension of the core is difficult to be consistent, and the relaxation of the core after plasticization is inevitable. This is the main reason for the lotus leaf edge relaxation after using many whole core conveyor belts for a period of time, and it is also the reason that the conveyor belt is easy to bend. Of course, the root cause of lotus leaf edge on conveyor belt is the high growth rate of chemical fiber itself.
(d)PVC的伸长率与橡胶大不相同,用橡胶保护输送带时(PVG输送带),如果目标橡胶过厚(超过3mm),则在粘接界面上形成明显的90剥离性应力集中,容易导致目标橡胶的脱落。
(d) The elongation of PVC is quite different from that of rubber. If the target rubber is too thick (more than 3 mm) when the rubber is used to protect the conveyor belt (PVG conveyor belt), the obvious 90 peel stress concentration will be formed on the bonding interface, which is easy to cause the target rubber to fall off.
总之,PVC阻燃整芯输送机虽然技术指标能满足煤矿井下使用的要求,但疲劳寿命和磨损寿命都很短,不仅提高了使用成本,而且给生产带来了不稳定的因素。层叠帆布输送带在结构和材料上能够避免正好整芯输送带的上述不足,例如帆布织造时能够实现张紧度的均匀和低的应力伸长和变形,粘贴后能够柔软地抵抗冲击,目标与芯的粘接良好,目标的厚度也能够自由调整,输送带整体这些本质优点使层叠帆布输送带具有长寿命、稳定、可靠性。如能很好地解决帆布阻燃问题,叠层帆布输送带将代替整芯输送带在煤矿井下普遍应用。
In a word, although the technical indicators of PVC flame retardant core conveyor can meet the requirements of underground coal mine, its fatigue life and wear life are very short, which not only improves the use cost, but also brings unstable factors to the production. The structure and material of laminated canvas conveyor belt can avoid the above shortcomings of the whole core conveyor belt, such as uniform tension and low stress elongation and deformation during weaving, soft resistance to impact after pasting, good adhesion between target and core, and free adjustment of target thickness. These essential advantages of the whole conveyor belt make the laminated canvas conveyor belt have the advantages of uniform tension, low stress elongation and deformation, soft resistance to impact after pasting, good adhesion between target and core, and free adjustment of target thickness Long life, stability and reliability. If the flame retardant problem of canvas can be well solved, laminated canvas conveyor belt will be widely used in coal mine instead of whole core conveyor belt.

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