Electric single-girder crane gnaw rail,how do we do?
Electric single-girder crane is widely used the areas of national economic construction and departments, is an important and indispensable in modern industrial production equipment.And affects the use of electric single-girder crane and the personal safety equipment cart gnaw way phenomenon is very common, chew, so to solve the problem, to safeguard, the use of crane is especially important.
So-called chew is a bridge type crane or lifting the car in the running process, the wheel rim and bearing rail profile extrusion and friction, also called gnaw rail. Produced by crane on road side force of crane rail and wheels, metal structure and the beam frame structure will produce destructive effect, chew way caused by the horizontal lateral force can be calculated by the next type: Ps = 1/2 Σ P * lambda. Type Σ P - crane happen in lateral force side often appear the most unfavorable wheel pressure lambda - the sum of horizontal lateral force coefficient, related to crane span and gauge, generally take 0.1 ~ 0.2 Crane chew the reason is very complex, chew the damage form is varied.But can be summarized the following respects.
1. The problem of orbit.Inspection found that a lot of units cart track installation quality does not meet the requirements of rail fixed method is not scientific, standardized.First appear wavy orbit, gauge exceeds the national standard.Test procedures: track S 10 m or less, the limit deviation Δ S = + / - 3 mm, S > 10 m, Δ S = + [3 + 0.25-10 (S)] mm, not more than plus or minus 15 mm maximum.Second, fixed rail linking piece does not conform to the requirements of inspection room found in metal structure more and more, more and more steel beam orbit, fixed rail clamp, is fixed by the simple bending iron, greatly reduces the pressure plate in the direction of the horizontal and vertical two fastening force, while the crane in use will have a larger impact and vibration.Therefore, cannot be effectively stop moving platen, orbit.Finally, the discretion of the two orbital difference exceeds bid, if the same cross section two rail height difference exceeds the national standard requirements, the crane runtime tilt to one side, and lead to chew.Provisions of the same cross section two rail height difference should not exceed 10 mm.But the actual tests, found that due to causes such as terrain, layout, installation height difference exceeds orbits installation requirements, for it is not allowed.
2. The big wheels of horizontal and vertical deflection overweight due to chew.Wheel lateral deviation of the rules is not more than L / 1000 (L) for measuring length, if beyond the standard width of the wheel center line and the center line of the orbit form an Angle, if two subdivided driving wheel deflection, the wheel will run in the direction of the deviates from orbit of alpha Angle, the wheels must face.Also caused on road wheel vertical deflection is beyond standard, wheel face when installation of vertical deflection is not more than L / 400 (L) for measuring length.Wheel vertical deflection is the center line of the wheel tread and plumb line a beta Angle, vertical deflection error is increased by the operation of the wheel radius, the radius R, to run the wheels run along the way, a week for two PI R, produce vertical deflection, the radius of its running into R1, at this time the wheels run along the way, a week for two PI R1, each run for more than week wheels run 2 PI R1-2 PI R = 2 PI (R1 - R), the lead for the wheels, but because of the rim and orbital limit cannot excessive lead, leading to chew.Wheel vertical deflection caused excessive eating way is only related to active wheel vertical deflection, has nothing to do with passive wheel, but from the wheel bearing uniform stress and contact area of wheel and rail factor, also does not allow passive wheel vertical deflection is beyond tolerance.The same set of wheels (active or passive) of vertical deflection direction opposite to decorate, should be taken outward or inward deflection at the same time, at the same time in this way, after the bridge bearing, will reduce the wheel vertical deviation. 3. The drive system error caused by crane runtime chew.To drive the cart running institutions respectively, if the motor is out of sync, two brake adjustable elastic uneven, lead to the crane cart gnaw way, for the kind of situation can adjust or replace the transmission system of parts, reduce the transmission error, finally to achieve synchronous operation. 4. Processing time installing error caused crane on road.Such as crane cart two driving wheel diameter machining error exceeds bid, or to avoid eating way, crane driving wheel tread processed into certain cone, so that the crane can automatically adjust at run time, but if the installation direction error, will add to the crane on road. All in all, there are many factors which can cause the crane on road, but as long as through eating forms of careful analysis, adopt scientific methods and steps, gnaw rail problem is solved.