Frictional force monitoring system for middle troughs of scraper conveyor

A frictional force monitoring system for middle troughs of a scraper conveyor, comprising:

• in each of the middle troughs of the scraper conveyor, three rectangular through holes being provided at equal intervals along a running direction with a central line of the middle trough as a reference, wherein
• a rectangular force receiving module is mounted in each of the rectangular through holes and the rectangular force receiving modules match the rectangular through hole in shape, and an upper surface of the rectangular force receiving module coincides with an upper surface of the middle trough;
• a three-dimensional force sensor is disposed between the force receiving module and the bottom of the middle trough, a counterbore is provided in the upper surface of each of the force receiving modules, and the force receiving module is connected to the three-dimensional force sensor at the bottom of the middle trough in the counterbore;
• a sealing cap is disposed on a top of the counterbore, and an upper surface of the sealing cap coincides with an upper surface of the force receiving module;
• a temperature sensor is pre-embedded in each of the force receiving modules;
• a controller is in signal connection with the three-dimensional force sensor and the temperature sensor via a data acquisition card;
• the three-dimensional force sensor and the temperature sensor are configured to achieve multi-point interconnected monitoring, thermal and force data about the middle trough during operation of the scraper conveyor is obtained in real time, and a fault position in the scraper conveyor is determined according to exceptional data in the following manner:
• the sensors are grouped, each group of sensors is numbered and the positions of each group are marked, tangential friction forces is measured by the three-dimensional force sensor and temperature is measured by the pre-embedded temperature, if data is excessively large or small at a certain position, the frictional force monitoring system determines according to the number and position of a data exception group, that the scraper conveyor has a fault at this position;
• according to data monitored by the multiple arranged force receiving modules, an overall load capacity, overall frictional force, and average friction coefficient of the scraper conveyor, and a temperature of a friction surface of the middle trough are calculated by using a computer of the frictional force monitoring system in the following calculation manner:
• a calculation formula of the overall frictional force is as follows:
• F
• =
• ∑
• x
• =
• 1
• n
• ⁢
• s
• *
• (
• f
• x
• ⁢
• 1
• +
• f
• x
• ⁢
• 2
• +
• f
• x
• ⁢
• 3
• )
• 3
• ⁢
• s
• 1
• wherein:
• F denotes the overall frictional force;
• n denotes the number of the segments of the scraper conveyor;
• s denotes an effective conveying area of each of the segments of the scraper conveyor;
• s1 denotes the area of each of the force receiving modules;
• and
• fx1, fx2, and fx3 denote tangential friction forces output by the three-dimensional force sensor;
• and
• a calculation formula of the overall load capacity is as follows:
• M
• =
• ∑
• x
• =
• 1
• n
• ⁢
• s
• *
• (
• F
• x
• ⁢
• 1
• +
• F
• x
• ⁢
• 2
• +
• F
• x
• ⁢
• 3
• )
• 3
• ⁢
• s
• 1
• *
• g
• wherein:
• M denotes the overall load capacity;
• n denotes the number of the segments of the scraper conveyor;
• s denotes an effective conveying area of each of the segments of the scraper conveyor;
• s1 denotes the area of each of the force receiving modules;
• and
• Fx1, Fx2, and Fx3 denote positive forces output by the sensor.