Differential Constant Torch Ratio Transmission System Research Of The 5 T Double Drum Winching

The power-driven winching is a significant lifting equipment in the construction field such as electric power,post and telecommunications.As the same time for security reasons,State Grid requires construction machinery used in large line,especially the engine driven winching is not allowed to use single drum winching.Currently the double drum winching on the market exists some problems,for instance,the gear tooth surface is worn seriously in shunt box,the tooth root is broken and gear shaft is distorted.This paper analyzes the existing problem in double drum winching drive-system,it’s pointed out that the friction direction between the wire rope and the front,rear rollers is consistent,so that an additional torque,which rotates around the intermediate support axis,is generated between two rollers;And because of the existence of additional torque and bearing radial clearance,the gear tooth contact stress in shunt box should be greater than the design value.In order to solve this problem,this paper presents a non-equidistant profile connection support structure in double roller tail,using equidistant profile connection to undertake the additional torque between the double drum system,eliminate the influence of bearing radical clearance on gear transmission,and reduce the gear tooth surface contact stress.To solve these problems such as the tooth root is broken and gear shaft is distorted,this paper analyzes the existing closed force system between double drum system.On the one hand,the gear transmission in shunt box causes the peripheral speed of the front and the rear roller to be consistent;On the other hand,the friction from the wire rope makes the linear velocity between tow rollers consistent.However,due to the manufacturing error of the front and rear rollers,the uneven wear during operation makes the working radius of two rollers inconsistent,therefore,the output linear velocity between tow rollers and the output speed can not be equal at the same time,and the whole transmission system is too constraint,resulting in the regular force relationship between the double drum system being destroyed,then forming a closed force system.The closed force system would cause the temperature rise,the engine power output be insufficient,the failure of gear input shaft be distorted and gear tooth root be broken and so on.In order to solve the problem of closed force system for transmission system,this paper presents a new type of spur gear differential as the drive system for the front and rear rollers.Utilizing the features of spur gear differential that can be differential and twisted,thus to remove the additional torque condition radically.Through the virtual prototype software Adams to make dynamics and kinematics analysis for this new spur gear differential,verify the feasibility of it as the drive system for double drum winching.A new 5 t double drum winching was designed,then tested its lifting capacity.In addition,the dynamic parameters of the differential were also tested.The experimental results show that the drive system of double drum winching developed in this paper can meet the using requirements.