Ever-Power Industry Co., Ltd.
Tel:0086-571-88220652 Fax:0086-571-88220651
E-mail:
GravityConveyor
| Gravity conveyor has manyadvantages. It is easy to be installed, expended and alternated in setupbesides its low-cost. Theoretically when in use, gravity conveyor needstwo angles of inclination. One is used to motivate the loading and theother is used to maintain the rolling of the loading(p3-2). As a matterof fact, it is impossible to have two angles of inclination at the sametime. Therefore, we make a compromise angle between the more precipitousmotivating angle and that of theless precipitous rolling one. As a result, problems will come outespecially in two places(1) The angle of inclination designed for light loading will be put with heavy loadings. (2)After the first loading is motivated , the friction of the wheel willdecrease because of the revolution which makes the second loading runsinto the first one because its rolling speed becomes faster. After thebumping, the two loadings combines together making the rolling speedmuch faster. These two situations will result in the damage of the loading or hurting the workers as the loadingsroll to the end of the conveyor and bump the quit machine. To solvethese problems, we can use speed controllers , though it has certainrestriction in weight extent and increases cost. Except for the problemsmentioned above, gravity conveyor is the most economic ways to beconsidered in priority. |
P 3-2the formation theory of the inclination angle of the gravity conveyor
Gravitywheel conveyors
| Gravity wheel conveyor (p3-3) is sometimes called skate wheel. Its maincharacteristics are as follows: it is light, easy to move and the wheelrotate independently in the turning section. As for some light goods,the inertia of the wheel is comparatively low. What’s more, it is easyto be installed and separated. |
P 3-3 gravity wheel conveyor
| (1) use scope: In terms ofthe articles with soft surface for example cotton bags, wheel conveyorcan transport much better than roll one. In this kind of application ,we can choose to put the articles in a line so that he articles can rollaccording to the traces. If in the bottom there are hollow containers orbaskets, I is not suitable to use wheel conveyors. In order to keepbalance in the process of transportation, one article should besupported at least by five wheels at any time(p3-4). |
P 3-4 The goods at least need five wheels to support(see3-4).
| (2) thechoice of material quality: The frameworkof the wheel conveyors can be chosen from steel and aluminum. Thealuminum framework can be used to load light and movable devices.Compared to the steel framework, its loading capacity is a bit low. Andwheel can be made from steel, aluminum and plastics. Generally speaking,the loading capacity of steel conveyors is 11-23kg, that of the aluminum4.5-18kg and that of the plastics is below 10kg. (3) sizespecfication: The valid width ofthe conveyors provided by most manufacturers is 300mm, 500mm or 600mm.And the standard length is 1.5m, 2m and 3m. The wheel number in unitlength is decided by experience. Generally speaking, in terms of smallgoods, more wheels are needed, but the arrangement of the wheel consistsof many different kinds of pattern due to the number of the wheels ineach row and the interlace arrangement(3-5). The framework of the commonstandard wheel conveyor consists of two steels of 60mm?5mm.The wheelneeds some oil to lubricate. If the using temperature is beyond0-38℃, you should inquire the manufactures in case of certainlubrication problems. We also have specific wheel conveyors that cam beapplied in higher or lower environment. The intensity and the loadingcapacity of the framework are related to the distance of the supportingframe. Most manufactures will provide a list of the permittingdeformation extent(3-1). In the process of calculating, if thedeformation extends the permitting deformation extent, you can consideradd more supporting frames or use different ways of supporting. How muchthe conveyor declines is related to the weight of the goods and itssurface conditions. As for cotton bags, the average inclination is 7.5cmhigh per 3m. If the goods are comparatively hard, smaller inclination isneeded and the goods with comparatively soft surface acquire largerinclination. Experience and testing are the only way to decide theinclination. Generally speaking, the biggest length is 12-15m if thereis no reducer. |
P 3-5 patterns of wheel arranging
Form3-1 the deformation amount of the framework according to the loading
支撑距离 | 每50kg负载 变形量 | |
钢 | 铝 | |
1,500 mm | 0.326 mm | 0.602 mm |
3,000 mm | 2.414 mm | 5.284 mm |
| (4)function module: According tothe function, wheel conveyor has many applying modules such as straightmodule, turning module and divergence module. The combination ofdifferent function modules can completely meet the needs of the system.As a rule, the turning module has patterns of 45°and 90? The averageinclination of the wheel is only half that of the straight module. Asthe wheel of the turning module revolves independently and the wheel ofthe external part revolves faster, the radius of the inner part shouldat least the same as that of the length of the goods in order to keepthe direction of the goods. Generally speaking, the longer the radiusis, the more convenient it is to transport the goods but not to befilled in the turning section. The formula to calculate the width of theturning module conveyor is as follows(3-6). |
P3-6 the width dimension specification of the turning module
| The divergencemodule can be used for direct transportation and left &righttransportation and also for distributing parcels. It can be connectedwith the gravity and powered systems using a lever to control thedivergent rolling rail or using controller through press-buttons. |
Gravityroller conveyors Gravity ball conveyors Gravitywheel conveyors Poweredconveyors