关 键 词：

运输机 传动系统

资源描述：

带式运输机传动系统,运输机,传动系统

内容简介：

Discussion about pull installation of belt conveyor Belt conveyor also claimed rubber belt conveyor , which is called “leather belt ” in the produce scene, is the continuous facility for transporting of the common : factories and mines. The major parts of belt conveyor include conveyor belt, actuating device, bearing roller, cylinder, frame, tension station, brake, supplementary equipment as well as elector- mechanical protective device and so on. When designing belt conveyor, first, should determine original enumerated data; And in the design calculation of type selecting need to select related parameter reasonably, making them close to actual operation state worth in order to raise economic benefits and the comprehensive technology of belt conveyor. Tension station can be designed with definite parameter according to the requirement for tension in the operation of conveyor belt which including characteristic, installation location, tension adjusting range and the type of tension station and so on. In belt conveyor system, the main effect of tension station has the following: (1) Guarantee conveyor belts split of driving pulley have proper tension in order to avoid skidding conveyor belt. Making belt conveyor stabilize operation, we need to guarantee conveyor belt have enough tension in driving pulley split place, in order to make conveyor belt rely on , with the friction of cylinder, transmitting the haulage needed by system. If split place has little tension, conveyor belt would hit on cylinder slippery. (2) Guarantee having necessary tension each on the girth of conveyor belt so as satisfy sag requirement. Conveyor belts sag between two bearing rollers should not be exceptional , otherwise conveyor belt would relax excessively to lose groove shape cause the side slip of conveyor belt , arouse spillage , increase operation resistance. Therefore automatic tension station should guarantee that conveyor belt has enough tension in the minimum tension place in order to restrict sag between bearing rollers on conveyor belt, keep belt conveyors steady operation. (3) The regulation of tension in the not steady working condition of start , brake etc. In the course of starting, the haulage that conveyor belt need to bigger than steady nts operation much, therefore it has to raise the tension value in the split place of the driving pulley to produce larger haulage. And in brake course, the tension on the tight side of conveyor belt can reduce , even arouse the tape of layer upon layer probably. (4) Compensate line viscous elongation and the flexible elongation of conveyor belt. Conveyor belt can automatic elongation after a long time, and occur permanent elongation under transitional operating mode, , so it is needed to compensate plasticity and the change of elongation in transitional operating mode. Since load change can arouse conveyor be1ts length changing, vesicular phenomenon can also cause the elongation of conveyor belt, and tensile force changes , it has to regulate the location of tension pulley often , and guarantee the normal operation of belt conveyor. (5) Offer necessary route for conveyor belt to contact again. Each belt conveyor has some joints , possibility in certain contact for a short while can arise problem, must stop first and then make the joint again. Tension station has prepared the belt besides load for belt conveyor, so contacting fault can be contacted again through relax tension station to solve problem. Tension station, for belt conveyor transportation system, has the important role that cannot replace . Domestic and international scholar has carried out plenty of researches for it , has developed a lot of new products. Its development course can be summed up approximately for 3 following stages: First stage is pure mechanical tension stage. The major products of this stage have stationary winch tension station and heavy hammer tension station. Heavy hammer tension station reaches the purpose that pulled through pulley groups and heavy hammer piece, when the elongation of gummed belt, it can absorb its elongation voluntarily. The stationary winch tension stations function of tension is to pull only, when belt elongation tensile force drop because of various reason, it can be pulled again only it its discovered that is rear to pull . Second stage, the adjustable stage of tensile force. The typical product of this stage is voluntarily winch tension station. Its technology develop shows that it can only realize the automatic tight in steady stage, it is constant to maintain the tension of gummed belt in steady stage. And its tensile force under the instability operating conditions such as brake or starting-up is same as the stationary winch. The time of winch operation is very short, nts and the most of times is in parking await orders state. The stage of third is that development automatic tight stage. Major products have hydraulic winch automatic tension station and hydraulic automatic of big jar .Hydraulic winch is in working form hero for a long time, its structural feature is have no floodgate. Automatic tension station pulls conveyor belt with the tension station of pulling force, automatic tension station can not only come from according to the haulage of active cylinder to move regulation tensile force , and can also compensate plasticity and the flexible elongation of conveyor belt to warp, at the same time, allocate tension sensor and change to send ware, to survey the tension of conveyor belt. In belt conveyor is systematic to arrange , reasonable definite tension station is to guarantee conveyor normal operation , start and brake safety and reliable as well as the necessity with reasonable economy prerequisite. The working property of tension station not only depend on its structural performance, but also concern with belt conveyor start ,brake property, the installation location of tension station. Tension station can be divided into stationary, heavy hammer type and automatic type 3 kinds according to structural type. (1) stationary tension station include spiral pull and regular winch pull. It is put up that pulls the bearings of pulls cylinder in spiral system to install when move about, moving frame can slide on rail, when revolving screw rod, it is together ongoing to make the nut on moving frame follow moving frame with retreat , reach the purpose that pulls and relaxes. Its characteristic is structure simple, but stroke of tension is too little , applies to the conveyor of short distance only, when general captain is smaller than 80 meters, just chooses. Fix winch tight way that can only adjust conveyor belt tight level regularly. Normally, beginning has been in to tight state , makes the conveyor belt bear extra additional load, and in operation course, tensile force gradually reduces along with permanently change of conveyor belt to increase, and regular appearance gradually to hit slippery phenomenon. (2) type of heavy hammer tight. Heavy hammer tension equipment, Including one hammer type, multiple hammers type and hammer vehicle type. The structure of heavy hammer tension equipment is simple , it is applied comparatively extensively, can guarantee tensile force maintenance constant in various operating conditions, and can nts absorb and compensate the elongation of conveyor belt voluntarily. The characteristic of heavy hammer tension equipment is that tensile force does not change , has higher reliability; Pull force do not change is also its shortcoming at the same time, as a result of tensile force can not regulate , at the stage of starts , as well as transport quantity occur change conveyor belt can hit since tension is below slippery, in starting and stabilizing not operation course, also produce vibration easily since tension is not suitable. Besides, since the arrange room is restricted ,the displacement of hammer should not be too large. (3) automatic pull Automatic tension equipment is the type tension equipment of extensive application in modern conveyor, it make conveyor belt have reasonable tension distribution , and compensates the flexible and plasticity elongation of conveyor belt voluntarily. Automatic tension equipment twines wire rope normally by winch to pull cylinder, so pull leather belt. Automatic tension equipment can be divided into electric winch tension equipment and hydraulic winch tension equipment according to different driving forms. Electric winch tension station is to use tension sensor in order to feedback , adjusts the size of tensile force voluntarily according to the different operating conditions of belt conveyor , has not high quality by tension sensor or mechanical systematic inertia and the influences such as signal hysteresis and automatic winch have wrong operation phenomenon , affect it to use ; Hydraulic winch tension station is to regulate the size of tensile force by the pressure oil that hydraulic station produces through controlling hydraulic winch , since hydraulic station and oil cylinder are in working .state all along, when hydraulic systematic or control system arises fault, for conveyor belt, can not produce tensile force or tensile force to become invalid, reliability reduces relatively. In actual application, we will first calculate haulage reasonably according to the working condition of belt conveyed , then select tension st