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Differential planetary gearbox for unloader

After the bridge grab unloader grabs the bulk material on the ship through the grab, it is discharged to the conical hopper, and then sent to the belt conveyor on the wharf through the hopper discharge port, and then to the storage yard. The material grabbing system is one of the most important parts of bridge grab ship unloader.

key word:Heat exchange element


Product description

1. Introduction

After the bridge grab unloader grabs the bulk material on the ship through the grab, it is discharged to the conical hopper, and then sent to the belt conveyor on the wharf through the hopper discharge port, and then to the storage yard. The material grabbing system is one of the most important parts of bridge grab ship unloader. The material grabbing system adopts the form of mechanical differential four drum steel wire rope traction trolley. The four drum mechanism consists of motor, coupling, brake, differential reducer and steel wire rope drum. Lifting, opening and closing, small vehicle traction can be operated independently or jointly, The four drum mechanism can not only realize the lifting and opening and closing of the grab, but also realize the horizontal round-trip operation of the grab trolley.

 

2. Structure of differential reducer of ship unloader

2.1. Freedom of reducer

When the number of rotation of input shaft is determined, the number of revolutions of output shaft is the determined reducer, which is called a reducer with degree of freedom, which is characterized by only 2 shafts on the box. There are 3 shafts on the box. After the number of rotation of input shaft is determined, the rotation number of output shaft is uncertain. It can be called a reducer with 2 degrees of freedom after the rotation number of the third shaft is determined, which is generally called differential reducer. One degree of freedom of differential reducer is fixed, two degrees of freedom control movement according to requirements, and can be combined or decomposed by motion or power.

2.2. Constitution of differential reducer

The differential reducer of ship unloader is composed of tooth shaft, gear, sun wheel, planetary wheel, gear ring, idler, planetary carrier, bearing, oil seal, box, etc. (see Fig. 1). The utility model has the advantages of reasonable structure, avoiding the motor bearing additional radial force, easy lubrication, easy to lose heat, and no serious wear, heat, even gluing phenomenon of tooth surface. The gear transmission efficiency is high, lubrication is good, service life is long, easy to assemble and disassemble, and is easy to repair, and the operation quality of the equipment is improved as a whole.

 

3. Working principle of differential reducer of ship unloader

The working principle of differential reducer of ship unloader is divided into four types: lifting / opening and closing transmission; Trolley drive; Lifting / opening / closing + trolley transmission; Define the single acting drive of Rope adjustment by yourself.

3.1. Lifting / opening / closing drive

When the hoist / open / close motor is running, the input end of the lifting / opening / closing motor inputs a speed in one direction, and drives the sun wheel on both sides of the gearbox to run by rotating the gear coaxial with the sun wheel (at this time, the right sun wheel is opposite to the left side due to the transmission of the middle through an idler wheel). The rotation of the sun wheel also drives the planetary wheel to run. At this time, because the motor of the trolley is not running, the trolley shaft is fixed, and the inner and outer ring gear at both ends are fixed at the same time. Thus, the planetary wheel is only rotated around the sun wheel by the action of the sun wheel on the inner ring gear. Because the planetary wheel's axis is pressed per 120 ° A fixed one is arranged on the planetary carrier, and the planetary carrier is connected with the output shaft. When the axis of the planetary wheel is in circular motion, the output shaft has a speed output. At the same time, through the change of idler, the rotation speed of sun wheel at both ends is opposite, and the two output shafts of the reducer output two speed same and opposite speed. See Figure 2 for lifting / opening / closing drive path.

3.2. Trolley drive

When the trolley motor is running, the trolley shaft inputs the speed, and the gears connected to the trolley shaft are respectively transmitted to the inner and outer ring gear rings at both ends of the gearbox through the idler gear engaged with the idler gear and the two ring gears. At this time, the steering of the inner and outer gear rings on both sides is the same. The rotation of the inner and outer ring gear drives the planetary wheel to run, and the rotation of the planetary wheels on both sides is the same. At this time, because the lifting / opening and closing motor is not running, its input shaft is fixed, so that the sun wheels on both sides are still and the planetary wheel can only rotate on the surface of the sun wheel. Because the planetary wheel's axis is pressed per 120 ° A fixed one is arranged on the planetary carrier, and the planetary carrier is connected with the output shaft. When the axis of the planetary wheel is in circular motion, the output shaft has a speed output. Because the planetary wheels on both sides turn the same, the output of the two output shafts of the reducer is the same speed and the same speed. See Figure 3 for the transmission path of the trolley.

3.3. Lifting / opening / closing + trolley drive

This transmission path includes two kinds of speed input, namely, trolley and lifting / opening / closing. From the above two paths, the input speed of lifting / opening / closing can be transmitted by each gear and then applied to the planetary wheel by the sun wheel. After the input of the trolley is transmitted by each gear, the inner and outer gear rings will act on the planetary wheel (see Fig. 4).

 

If the sun wheel turns the same as the inner and outer ring gear, the two input speeds will be added. As shown in Figure 5, the trolley mechanism operates to turn the planetary carrier CCW by 30 °, The hoist (open and close) mechanism causes the planetary carrier to rotate 15° CCW,in Figure 5, the left center frame rotates 45° CCW, which drive the output of drum to rotate 45° CCW; At this time, another planetary lifting (opening and closing) mechanism operates in the opposite direction as shown in Figure 5, turning 15 ° CW,while the trolley mechanism rotates 30° CCW, The speed of the two inputs will be subtracted, and the output is rotated 15° cCCW, The planet carrier drives the output shaft to rotate 15° CCW, As shown on the right side of Figure 5. So the speed of the two drums is often inconsistent.

 

3.4. Define the single acting drive of Rope adjustment

The single acting transmission of differential reducer of ship unloader is usually only used for Rope adjustment after the unloader changes the hoisting / opening / closing long rope. The single action drive shall follow the principle of 1 input and 2 outputs. If an output shaft and trolley shaft are fixed, when the input hoisting / opening / closing speed is input, there is an input for the sun wheels at both ends. At this time, the fixed output gear set will not release the torque and output from the axle end of the trolley. This situation will damage the equipment such as the gearbox and lifting / opening / closing motor; When single action Rope adjustment is required, clamp the non-moving steel wire rope drum, disconnect the coupling of trolley universal shaft, open the high-speed axle brake of the trolley on one side of the single action drum. At this time, the rotation of the trolley shaft on the single action side is not limited; When the hoisting (open and close) motor turns, two sun wheels rotate, and one single drum is rotated according to the principle of lifting (open and close) transmission. The clamped drum cannot rotate, and the planetary carrier cannot rotate. The planetary wheel can rotate in place (the planetary axle is fixed) under the drive of the sun wheel, which drives the inner and outer gear ring to rotate, thus driving the trolley shaft to rotate. Therefore, before single motion, it must meet the requirements of the free rotation of the trolley shaft. When the rope is adjusted, the brake of the trolley high speed shaft shall be clamped. If the trolley shaft is not fixed, one of the two normal running steel wire rope drums will rotate, some of the rotating speed will be channeled to the trolley shaft and output, which will lead to the inconsistent rotation speed of the two steel wire rope drums and inconsistent length of the wire rope, so the rope needs to be readjusted.