1. The purpose to be achieved by this method

(1) Appropriately reduce the processing and installation accuracy of the belt conveyor drum, idler, frame and other parts, and improve the processing technology and the economy of equipment manufacturing.

(2) The belt deviating in the operation can be carried out without shutdown, automatic detection, automatic identification of deviating status, and automatic deviation correction.Then improve the production efficiency and reduce the loss caused by the shutdown adjustment.

(3) High training requirements for operators and maintenance personnel can be appropriately reduced.

(4) Correction should be fast and reliable.

(5) The correction accuracy should be high.

2. Composition of pneumatic automatic rectifying device

This pneumatic automatic rectifying device is generally composed of 1 or 2 sets of rectifying idlers (one set of hinged fixed end devices, one set of adjusting end devices with cylinder push, one set of rectifying idlers in each set) and one set of conveyor belt off-tracking position detection controllers.

Usually near the driving drum of the belt conveyor and the reversing drum, a set of anti-deviation idler device is installed.A set of conveyor belt off-tracking position detection controller is installed close to the driving drum and the fixed end of the rectifying idler.

The rectifying idler is hinged with the supporting plate mounted on the rack at the fixed end of the rectifying idler, so that the rectifying idler can rotate an Angle around the hinge point on the fixed end under the push of the adjusting end cylinder.In this way, the adjustment end of the rectifying idler can control the change of the included Angle between the line of the rectifying idler and the running direction of the conveyor belt under the action of the cylinder (greater than 90° or less than 90°). According to the running rule of "running after running but not before running" of the conveyor belt, the purpose of rectifying the deviation of the conveyor belt during running can be achieved.The length and size of the rectifying idler shall be determined according to the width of the conveyor.

3. Corrective principle and action process

When the belt conveyor through gas source, the power start to work, two five-way solenoid valve (y5) is in a state of loss of electricity, conveyor belt revolves according to the feeding direction of the belt conveyor running forward, idler pulley on the conveyor belt running deviation position detection controller has not contact with the edge of conveyor belt, under the action of tension spring, the controller is in the initial position (as shown in figure 1), the lever pneumatic directional control valve on the controller (E12 at 11:45) is in a state of compression valve core, rectifying rollers activity on the cylinder piston rod in the right position.Make correction roll shaft line and the conveyor belt running direction into 91.1 ° Angle (see figure 1), in accordance with the "run after not before running" rule, at this time of the conveyor belt will only to the direction of the roller on the conveyor belt running deviation position detection controller, idler pulley drive the connecting rod and push them to A point as the center, A counterclockwise Angle, so that the mechanical lever pneumatic directional valve (E12 at 11:45) under the action of the built-in spring valve core is reset, the reversing, gas path automatically makes the cylinder piston rod end position to the left movement, so that the correction roll shaft line and the belt running direction into 88.9 ° Angle (see figure 2).Also in accordance with the "run after not before running" rule, at this time of the conveyor belt to far away from the roller conveyor belt running deviation position detection controller direction, when the conveyor belt roller close to the edge and controller from, in under the action of tension spring, connecting rod will be to compress the reversing valve valve core, mechanical lever pneumatic directional valve pneumatic reversing (E12 at 11:45) implementation, and push the cylinder piston, again to the right side movement, the rectifying tower roll shaft line and the direction of the conveyor belt running back to 91.1 ° Angle, so as to realize the return of the direction of the conveyor belt running deviation.Is being pushed or loosen the conveyor belt, roller with repeated mechanical lever valve is compressed or release alternately, pneumatic directional valve alternately to realize reversing drive two cylinder piston reciprocating movement, led to rectify the motion of the roller, the rectifying tower roll shaft line and the direction of the conveyor belt running within the scope of 88.9 to 91.1 ° Angle change, realize the real-time dynamic automatic successive correction of conveyor belt.

Through the above analysis of the causes and laws of belt conveyor belt deviation, as well as the introduction of the traditional deviation adjustment and correction methods and the analysis of the advantages and disadvantages of various methods, a new practical pneumatic automatic deviation correction method of belt conveyor conveyor belt is recommended.The method has obvious rectifying effect, quick and reliable rectifying, high rectifying precision, and can realize real-time and continuous dynamic rectifying, with a high degree of automation and strong practicability. It can be widely used in all walks of life when there is a belt conveyor.