1. Gantry crane electronic control equipment commonly introduced

2. AC cam controller circuit for AC 50HZ, voltage 380V, current below 63A, the main change for the three-phase induction motor stator resistance connection circuit or the rotor circuit to directly control motor starting, speed and change forward. This controller has a reversible symmetrical circuit for gantry crane with a lifting mechanism operating agencies. Commonly used KT14 series rated current of 60A and 25A. KTJ15 series rated current of 32A and 63A. LK17 and LK18 series master controller is a gantry crane rated current 10A, for AC 50HZ, 380V working voltage electric power transmission and DC rated working voltage of 220V, the control circuit for converting to achieve the control panel ( box) remote control. Gantry crane master controller mainly by the contact elements, cam assembly, ratchet structure and other components. Double break contacts using direct-acting bridge structure. When the cam rotates with the handle contacts that separate or closing, controlled by or connected to the line that is breaking. Controller cam made ​​of plastic, ratchet structure using rolling bearings, operating force is light, gear clear, zero clear, communication controllers by natural interrupter, permanent magnet DC controller by arc blow. Gantry crane

3. Bridge ( door ) cranes Currently, the crane must be tested by using the register be put into use after passing. During the inspection the bridge ( the door ) cranes, the main beam and the amount of camber main bridge gantry crane beam deflection measurement set is an indispensable element. Main beam camber measurement method, mainly water level measurements, pull wire ( Amendment) Act and laser straight line method measured deflection mainly theodolite, laser range finder, etc. ; due to different inspectors for camber and understanding different deflection, although the same measurement method, measurement point but full of tricks, with mixed results. Not standardized measurement method, camber and deflection values ??measured on the test and determine whether the single girder gantry crane qualified meaningless. In order to eot crane measure the value of camber and deflection can truly reflect the bridge ( the door) as an indicator crane girder situation, we must design intent, analyze measurement and evaluation standards. The purpose of the bridge and making the definition of a camber camber and deflection ( door ) crane main beam camber (F) is the main beam prefabricated by the horizontal line, counting the amount of upward arch. Deflection refers to the rated load in the main beam under the car, the elastic deformation of the main beam generated span down counting from the actual position of the front loading.single girder gantry crane