The heavy duty apron feeder is widely used in the crushing and grading workshop of large concentrator, as a self-storage bin for continuous or uniform feeding to the primary crusher, and can also be used as a short-distance transmission. For example, it is used to directly feed the ore into the large vehicle at the bottom of the mine chute, and is used to continuously and evenly feed and load the material from the raw material warehouse to each truck.
The heavy duty apron feeder reducer is a special reducer successfully designed by us. It adopts a three-stage direct-current reducer and a two-stage planetary reducer with two shells bolted together.
The main defects of the prior art feed reducer are: five-stage deceleration, four-stage deceleration, and too long transmission chain problems: the structure will be complex, the cost will increase, the whole opportunity will be heavier and the axial size is large:
(2) Due to the existing technology of heavy duty apron feeder two-stage planet failed to adopt heat dissipation measures, only rely on natural heat dissipation resulting in low thermal power, so that users have to increase one or two model numbers for selection, many mechanical theoretical monographs are so stipulated, the result will inevitably increase the cost, the greater the power, the more the cost increases:
For rated models, the selection of two models is increased: the price is increased by 90,000 yuan, the weight is increased by 3000kg, and the thermal power is only increased by 130kW. Thus, the structure of the existing technology must also be improved to increase the thermal power. The thermal power is the maximum power that the closed speed reducer can transmit continuously under the condition of lubricating oil equilibrium temperature. The thermal power should be equal to or close to the actual working power. Thermal power refers to the input power when the lubricating oil temperature does not exceed the allowable temperature under natural cooling conditions. Thermal power is an important parameter for designing lubrication system and an important basis for selecting reducer. High oil temperature is a very important reason for the failure of the reducer, this is because: high oil temperature viscosity decline, oil film destruction, lubrication failure leading to gear gluing, pitting and abnormal wear: high oil temperature leads to abnormal wear of the gear, wear makes the oil temperature rise, such a vicious cycle, premature damage to the reducer. The maximum allowable temperature of the lubricating oil pool of the reduction gear box is about 70℃.
The purpose of our improvement is to solve the defects of the existing technology transmission chain is too long and low thermal power, provide cycloidal transmission plus modular internal meshing gear pair, shorten the transmission chain to two stages, replace natural heat dissipation with water cooling in the interlayer of the box, so that the thermal power can be close to or reach the rated mechanical power, The utility model relates to a water-cooled heavy duty apron feeder dynamic balanced cycloidal reducer.
To realize the above purposes, the technical implementation scheme adopted by the invention is based on:
(1) The main cycloidal reducer is unchanged, as long as the modular internal engagement speed ratio is changed, it can be obtained i=280~840 series products: cycloidal efficiency: Efficiency n=0.9~0.98≈0.94, and because the pin and semi-buried hole dynamic match, so that the pin and cycloidal gear teeth in rolling mesh, the efficiency is slightly higher than the existing model with needle sleeve, so it can replace the two and three planetary transmission, shorten the transmission chain:
(2) According to the following discussion on the cooling and cooling device can make the thermal power is not less than the mechanical power: the size of the thermal power is related to the cooling measures, if the use of circulating oil lubrication, the cooler and the external tank are large enough, the thermal power can be not less than the mechanical power: Lubricating oil → oil pump → oil filter → fan cooling → oil into the tank, as long as the oil supply and fan air volume is large enough, the reducer can even be not limited by heat power; When the cooling water flow and flow rate are large enough to control the oil temperature in the box at about 70 ° C, the thermal power P of the reducer can be increased by 1.5 times. This is because: the thermal power correction formula P= Bref·B,·B·B·P. (kW) oil temperature coefficient B=0.667, so that the thermal power P increased by 50%. In the formula, Brf, Bv, B and B are the correction coefficients of ambient temperature, air flow rate, altitude and maximum oil temperature respectively, where: B,= 0.00236·C.32845=0.667(70℃).
