爲了保证开式齿轮的啮合间隙，应特别留意卷筒凸外缘与大齿轮止口的公称尺寸，二者之间的公差不宜过大，防止啮合间隙一侧过大而另一侧过小，同时留意卷筒凸外缘端面与卷筒外圆的垂直度。这样才干保证大齿轮的外径与卷筒轴同心，从而在拆卸中保证开式齿轮副啮合间隙的分歧性。The hoisting hoist is a kind of machine that uses steel rope or cable pulley group as lifting gear to connect with the gate. Through gear transmission, the hoist drum can be winded and released to drive the hoisting. It is also called wire rope fixed hoist. It has complex structure, easy manufacture, convenient maintenance and repair, and is widely used in the opening and closing of various types of gates. The hoisting hoist can be divided into single hoisting point and double hoisting point. Double hoisting hoist is a hoist with two single hoisting points connected by a connecting shaft to stop synchronous operation, which can be made into one-side drive or two-side drive. The hoisting hoist is usually a gate with a hoisting device, which is installed on the pier above the top of the gate groove. The capacity of hoisting hoist which has been consumed and put into operation in China has reached 6000 kN, 30m, 4000 kN and 120m. As an important part of water control project, water diversion project is a large-scale water diversion project to deal with urban water supply, industrial water and agricultural irrigation. Secondary projects include intakes, diversion tunnels and outlet water hubs. The fixed hoisting hoist is installed in the gate chamber at the elevation of the intake for hoisting the accident gate at the intake. The machine is deployed, and the gate task mode is dynamic water closing and static water opening. Secondary technical parameters of hoist: hoisting force 1200KN, hoisting speed 34m, hoisting speed 1.609rn/min task-level Q2 pulley group multiplier 4 gear total transmission ratio 419.05 three hoist structure layout and task principle. The hoist consists of hoisting installation, transmission mechanism, maintenance installation, frame and other components. After a motor drive, using a three-stage accelerator and a first-stage open gear to accelerate, drive the drum to rotate, through the wire rope on the drum, drive the gate to rise or fall. The hoist is equipped with gate opener, which is used to control the upper and lower limit position of the gate, the post-setting position and the rising and falling position of the gate through the display device. In order to avoid overload operation of the hoist, load limiter is installed under the bearing seat at one end of the drum. When the hoist load reaches 110% of the additional load, the load limiter retrieves the signal to alarm and automatically cuts off the main circuit power supply. The brake holds the brake and the hoist stops working. The operation sequence of the four hoists 1 generally states that the machine adopts the control mode of on-site control and on-site monitoring of the position of the gate. Before lifting the gate, first of all, the filling degree of piecemeal pressure in the tower body is applied to stop filling degree pressure, so that the water pressure in the upper and lower reaches of the gate body is equal. After confirming the level pressure, the lifting gate operation can be stopped. 2. The operation sequence of gate hoisting is according to the "hoisting" button of the control cabinet. The motor rotates in the hoisting direction. When the gate rises to the upper limit position, the height sensor (or the master controller) moves and automatically cuts off the power supply. The brake holds the brake and the hoist stops running. After lifting the gate, if it is not necessary temporarily, it should be locked into the overhaul platform. 3. Before closing the gate in descending order, the gate should be lifted slightly, unlocked, and then the "drop" button of the control cabinet (lock of the gate has been released) is pressed. The motor rotates in descending direction and the gate falls down. When the gate reaches the lower limit, the height sensor (or master controller) measures, and automatically cuts off the power supply, the brake holds the brake and the hoist and shut-off machine. Stop operation. Five-part manufacturing 1-frame hoist sorties are used to install the components of hoist and transfer the load to the root to ensure the normal operation of hoist. Its characteristics are large machining capacity and high manufacturing dimensional accuracy. The dimension design of the frame requires that the dimensional error of each processing surface be no more than 0.5mm and the absolute height error between the processing surfaces be no more than lmm. Ordinary machine tools can not meet the processing requirements, there must be a specific milling machine to complete the processing, the whole milling machine is composed of bed guide, milling power head and cushion block. The length of the bed guide is longer than the length of the machined frame. When the height difference between the two machined surfaces exceeds the adjustment range of the power head, the height can be adjusted by the cushion blocks already machined on the grinder. The whole milling machine can be placed in different positions according to the requirements. Before milling, the rack is placed on the platform and the waist line of the rack is drawn. Then the height of the waist line and the height difference of the absolute waist line of the surface to be processed are identified by the degree meter, height ruler and meter ruler, so as to measure the processing allowance of the surface to be processed, and at the same time, the processing allowance of other processing surfaces is considered comprehensively. When stopping milling, the center line of power head and milling cutter head is perpendicular to the surface to be processed. Detailed technology can be divided into two processes: rough milling and finish milling. After rough milling, the machining allowance of 1-2 mm is reserved. Thus, the machined rack can be guaranteed better whether the absolute height or brightness of each processing surface. The processing time required by this method is shorter than that required by other methods, and the effect is very ideal. The outer dimensions of drum drum are set according to the requirement, the wall thickness of cylinder is determined according to the outer dimensions. The roughness Ra3.2 is made of cast steel ZG270-500, which is welded into a whole after casting in stages. After the drum is welded and formed, the butt weld shall stop non-destructive testing, and stop the treatment of low temperature decay heat, eliminate stress and wave structure, so as to prepare for ensuring the processing accuracy of the drum. Processing time should ensure that: (1) the average thickness of the drum wall, the thickness difference of the drum wall does not exceed 8 mm everywhere; (2) the coaxiality of the outer cylinder and the inner hole of the drum does not exceed 0.3 mm; (3) the coaxiality of the convex outer edge of the drum and the inner hole of the drum does not exceed 0.3 mm, and the perpendicularity does not exceed 0.6 mm. In order to ensure the average behind the drum wall, attention should be paid to inspection before processing.