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Weihua crane The content and method of test run of bridge crane?
I. WEIHUA CRANE,preparation and inspection before operation test
In order to ensure the safety and smooth operation of the test, lifting equipment must be carefully checked before the test, and do a good job for the test Be prepared.
(1) turn off the power of the crane and check the fastening of all connecting parts.
(2) surrounding situation of steel wire rope in drum and pulley group.
(3) check whether the insulation resistance of the circuit system and all electrical equipment meets the requirements with a megohm meter.
(4) add lubricating grease to each lubrication point.The hydraulic cylinder and buffer of the reducer and brake shall be lubricated as required.
(5) remove all articles on the track of the truck, on the crane and in the test area that hinder the operation test.
(6) personnel unrelated to the test must leave the crane and the test site.
(7) take measures to prevent electric shock to the personnel who participate in the operation test on the crane.
(8) prepare heavy objects for load test.Heavy objects may be ingots, billets, bars, pig iron blocks or large casting blanks of relatively high density.But must calculate accurate or weigh accurate quality, should bundle reliably good.
(9) check whether the test conditions (such as site, wind speed, etc.) meet the requirements.
Weihua crane,No load test
(1) rotate the brake wheels of each mechanism by hand, so that the last shaft (such as the axle or reel shaft) rotates once, all the transmission mechanisms are smooth and there is no jamming.
(2) start each mechanism separately, and the operating direction of the control mechanism should be consistent with the movement direction of each mechanism.Try the turn slowly first, then again
Rated speed of operation, observe the smooth operation of the mechanism, no impact and vibration and other phenomena.
(2) run back and forth along the full length of the stroke!Second, check the running mechanism of large and small cars.If the gantry crane and loading and unloading bridge running speed is slow and the cart travel is long, in order to prevent motor overheating, can be used for intermittent method, double beam crane active small wheels should be in contact with the full length of the track.
(3) when conducting electricity with cables, the cable speed shall be coordinated with the speed of the operating mechanism.
(4) carry out various switch tests, including the limit position limiter of hoisting device rise (fall), limit position limiter of large and small vehicle operation, interlock protection devices, emergency switch of driver's cab, etc.
(5) when the hook is lowered to the lowest position, the wire rope safety ring on the drum shall not be less than 2 turns.
Iii. Weihua crane Static load test
Weihua crane The purpose of static load test is to test the carrying capacity of crane and its parts.
First lift the smaller load (can be 0.5 times of the rated lifting weight, 0.75 times) to run a few times, then lift the rated load, in
Bridge on the total length of run back and forth several times, after the car stopped in the middle of the bridge, lifting 1.25 times the rated load, about 100 ~ 200 mm off the ground, hover 10 min, unload, check respectively before and after the hoisting load amount column on the scale (or the workshop in the central part of ancient bridge room rack suspension line for measuring deflection under the hammer, the corresponding one GenLiang column) on the ground or girders, trial and error, a maximum of three times bridge no longer to produce permanent deformation (i.e., the first and the second check the scale value of the same), gantry crane and crane cantilever part should also be in accordance with the requirements of the test, just the car should be open to the cantilever end.
After the above tests, the trolley is driven to the end of the bridge frame for the bridge crane, and to the gantry crane and the loading and unloading bridge
To the upper leg, the actual camber and camber of the main beam and cantilever beam are measured respectively.
The camber of general bridge crane should be within the range of 0.7s /1000~ 1.4s /1000;Metallurgical cranes, gantry cranes and loading and unloading Bridges shall have a mid-span camber greater than 0.7s /1000;The upwarping degree of the cantilever end should be greater than 0.7l /350 (S is the span of the crane, L is the length of the cantilever).Finally, the deflection (elastic deformation) of the main beam is measured.The trolley of the bridge crane should still be located at the end, and the calibration of the measuring column on the ground or the main beam should be measured at the midpoint of the bridge frame, with this as the zero point;The gantry crane and the trolley of the loading and unloading bridge shall still be located above the supporting leg, and the calibration on the ground measuring column shall be measured at the middle point of the bridge frame and the end of the cantilever respectively, and the zero point shall be taken as.Then drive the trolley to the middle of the bridge frame and the cantilever end, lift the rated load, stop about 100mm from the ground, and measure the deflection of the main beam.Deflection of bridge crane should not exceed S/700;The mid-span deflection of gantry crane or loading bridge of metallurgical crane should not exceed S/1000;The cantilever end deflection shall not exceed E/350.Electric single-beam crane, electric single-beam suspension crane should not exceed S/600.
After the test, if no cracks, permanent deformation, peeling paint and other influences on crane performance and safety are seen, the connection
No looseness means that the test is qualified.
Iv. Dynamic load test
The purpose of dynamic load test is to verify the function of crane mechanism and brake.
Lifting motor load test load is 1.1 times the rated load.
Start each mechanism separately (or two at the same time), in the test, each movement should be carried out in its entire range of motion
Repeatedly start and brake, and according to its working cycle, the test should last at least 1h.The test also includes the test load on suspension
Air start, at this time the test load should not appear reverse action.After the test, all functions of the crane are normal, no damage is found to the mechanism or structure, the connection is not loose or damaged that is considered qualified test.