The tower crane after-sales service commitment letter

The tower crane after-sales service commitment letter The tower crane after-sales service commitment letter The tower crane after-sales service commitment letter Due to tower crane is the main vertical transportation engineering construction site operation tools, on almost every construction site safety and engineering schedule, therefore the company attaches great importance to enter the construction site of the tower crane machine performance, make sure to enter the construction site of each tower crane on the safety, quality, performance and appearance are in line with the requirements of relevant laws and regulations. For each tower crane down every day after carry out a routine maintenance machinery, transmission part should have enough oil, fragile must often check, repair or replacement. Of mechanical bolt, especially frequently vibration parts, such as the tower connecting bolts should be regularly checked whether loosen, such as loose must tighten or replace in a timely manner. The whole technical service of building machinery: including the basic, installation, use and maintenance of the equipment. For example, for tower crane rental business, we can in accordance with the need of field of construction, from meet the construction requirements and strive for economic, fast, to provide customers with more types of tower crane and recommend appropriate models. From the Angle of the safe and economic to provide crane positioning, based model in order to cut down the cost of installation, proper positioning installation conditions can reduce the use of crane machine-team and artificial man-hour), according to the requirements of the building structure is put forward of the location of the attached facilities and practices, and give full consideration to the scene of the schedule to optimize attached plan and section, to avoid schedule impact. All the customer needs to do is provide the relevant drawings and the discussion and formulation of the plan. Establishment company specializing in the maintenance and inspection service team, the company each tower crane for not less than 1 times a month of safety inspection, found the security hidden danger promptly eliminate, to ensure that each tower crane were operational, don't take a disease. After the inspection, the construction site shall be responsible for the signing of the mechanical personnel, and the site shall be retained by the company for 1 copy. In view of the particularity of various parts of various organizations, the maintenance system of different parts of the site is as follows: Maintenance and maintenance of mechanical equipment The brake should be inspected and adjusted regularly. In the case of friction, there shall be no dirt, and the contamination must be washed off with petrol or other materials. The lubrication and hydraulic oil of the 1.1 reducer, gearbox, and external gear, etc., are carried out in the lubricating oil table. You should be careful to check the presence of broken wire and loose stock in all parts of the wire. If you exceed the relevant regulations, you must replace them immediately. 1.4 all open gear drive must have a shield, walk open gear because of the lower part has outside leakage, so want to check the cleaning of the orbit, the grains of sand soil, from into gear and gear damage. Check the connection of each department regularly, if it is loose, it should be tightened. Tower connecting bolts should be checked in the compression of the tower when firmness, (can adopt the method of rotating arm frame to cause compression of the tower), all connection pin must be split pin, and open. It is necessary to eliminate the noise, if any, to check the operation of each machine regularly. Maintenance and maintenance of hydraulic climbing system The use of hydraulic oil shall be used strictly to lubricate and change oil according to the rules in the lubrication chart, and clean the inside of the tank. After the pressure adjustment of the overflow valve, the pressure adjustment of the overflow valve shall not be changed at will, and before each climb, the pressure gauge should be applied to check whether the pressure is normal. 2.3 should always check whether the pipe joints are tight and not leaking oil. The 2.4 filter should always check for a blockage, check the safety valve and adjust the value after use. Oil pump, oil cylinder and control valve, such as finding leakage should be repaired in time. 2.6 assembly and start the pump for the first time after the overhaul, should check whether the entry and exit after the first, electric rotation direction is correct, whether the oil pressure is normal, whether oil pipeline leak, after running light oil cylinder several times, after the discharge gas inside the cylinder, and lifting operations. At the beginning of winter, it will be open and stopped several times, after the oil temperature rises and the control valve is flexible and then used again. The maintenance and maintenance of metal structure The component shall be managed to prevent deformation and collision damage in transit. During the period of use, it must be repaired and maintained regularly in case of corrosion. Often check structural connection bolts, seams and components for damage, deformation and looseness. Paint the paint over every 1-2 years. Maintenance and maintenance of electrical system Always check all wires and cables for damage, and be sure to bind and replace damaged parts in time. The motor has an overheating phenomenon to stop in time, keep running after failure, and the motor bearing lubrication is good. The control box, distribution box and so on should always be kept clean, clean the dust on the electrical equipment in time, and keep the electrical equipment dry. 44.4 safety device's stroke switches must be reliable, and the problem should be repaired and replaced in time. Otherwise the crane is strictly prohibited. 4.5 shake protection grounding resistance measurement twice a year (spring and autumn), guarantee the grounding resistance is not greater than 4 Ω. 44.6 motor brush, the contact surface should be kept clean, when the original brush height 2, 3, should be replaced. 5, maintenance of safety equipment. 5.1 should each class should check the torque limiter, lifting weight limiter, height limiter, amplitude limiter, such as safety device is normal, switch are in good condition, whether the bolt fastening. (torque, weight limit available manual switch checks, height limiter lifting hook is the highest limit position should be able to stop automatically, amplitude limiter to start the car to the jib at both ends and block contact should be able to automatically stop.) The limit of the torque limiter and the weight limiter are carried out once every half month. Check if the accuracy of the two safety devices meets the requirements, and if the overload is found, the adjustment should be made immediately. The scrap standard for wire rope The quality of the broken silk and the number of the six strands of wire are mainly in the appearance, and the total amount of broken silk on the wire rope is to be discarded by the total number of broken wires. Wire rope type In the 6 d broken wires Broken wires within 30 d 6 x 19 + d 5 10 6 x 37 + d 10 19 Number of broken wires (d) The partial clustering of the broken wires if the broken silk is pressed together to form a local concentration, the wire rope should be scrapped. If the broken wires are clustered in a length of less than 6d or in any strand, the wire rope should be scrapped even if the number of broken threads is smaller than the number shown in the table above. The increase of the broken wire The increase rate of the broken filament is a period of time when the broken thread appears, as the number of broken threads increases gradually, and the time interval becomes shorter and shorter. In this case, in order to determine the increase rate of the broken wire, the paper should be examined and recorded, and the date of the disposal of the wire rope can be found. 6.4, the cord broke When the whole cord breaks, it should be scrapped immediately. 6.5, cable, due to the damage caused by the rope decreases, and when the wire rope damage of fiber core or steel core (or internal strand) of multilayer structure fracture and cause rope is significantly reduced, wire rope should be scrapped. The elasticity decreases The elasticity of the wire rope is more difficult to detect, and the general elasticity decreases with the following phenomenon: The diameter of the wire rope is reduced. The length of the wire rope is elongated. The gap between the wire and the wire is reduced. The obvious non-bending and diameter of the wire rope is much faster than because of wire wear. The less elastic rope can cause a sudden fracture in the dynamic load, and the wire rope should be scrapped immediately after the elastic reduction is found. 6.7, external and internal wear and tear When the outer wire rope wear amounted to 40% of its diameter wire rope should be scrapped, relative nominal diameter when the wire rope diameter decreases 7% or more not found broken wires should be scrapped. 6.8, external and internal corrosion Because of corrosion, the surface of the wire rope has a deep pit, and the steel wire is flabby and should be scrapped. 6.9, deformation In the form of this deformation, the wire rope should be discarded if the wire rope length is not greater than 25d, and the wire rope should be scrapped (d is for wire rope) Diameter, the diameter of the envelope in the shape of the wire rope. Cage distortion: should be scrapped immediately. The rope squeeze: should be scrapped immediately. Steel wire extrusion: should be scrapped immediately. The length of the rope is larger: it should be scrapped immediately. A knot: a serious kink should be scrapped immediately. The size of the length of the rope is reduced: the local serious reduction should be scrapped immediately. Partial pressure is flat: severe squashed should be scrapped immediately. It should be scrapped immediately. On January 1, 2014