Coal chute blocking protection device
1. Function of coal chute blockage protection device:
It is used to detect the blockage in the transfer coal drop pipe in the belt conveyor system. When the blockage is formed in the coal drop pipe, the device will immediately send an alarm and shutdown signal to the control center of the coal conveying system for emergency shutdown.
Anti blocking device for coal chute
2. Structure of coal chute blockage protection device:
The device adopts a door structure and is composed of a movable door, a travel switch or a tongue spring (proximity) switch. Generally, it is installed on the side wall of the coal drop pipe with the bottom up 2 / 3. Two groups can be installed. One group is installed at 1 / 3 of the bottom of the coal drop pipe as a slight blockage detection, and the other group is installed at 2 / 3 of the bottom of the coal drop pipe as a severe blockage detection. During installation, a 260mm hole shall be opened on the side wall of the coal chute × 260mm square hole, and then weld a 300mm baffle on the inner wall about 100-200mm above the square hole to prevent large materials from falling and hitting the movable door directly, and then completely cover and close the opening with the random elastic rubber plate on the outside of the coal chute. Then the randomly matched corner pieces are welded on the side wall of the coal chute according to the installation requirements, and the box body can be fastened with bolts.
3. Working principle of coal chute blockage protection device:
When the material is blocked in the coal drop pipe, the accumulated material will exert pressure on the side wall of the coal drop pipe, so as to push the movable door of the device outward. When the deflection angle of the movable door is equal to or greater than the controlled angle, its control switch will act to send out an alarm or shutdown signal. When the failure of the coal chute is eliminated, the movable door will automatically reset and return to the original state. Generally, this signal is connected to the control circuit of the rapper, which can automatically eliminate the blocking state without stopping the machine in case of slight blocking.
Material flow detection device
1. Structure of material flow detection device: composed of swing rod, contact plate, detector, limit tube and gantry. 2. Function of material flow detection device:
Detect the clockwise state of material flow when conveying materials by belt conveyor. Generally, the device is installed near the head of the belt conveyor and can send a switch signal to make the control center of the transportation system know which belt conveyor the transported materials arrive at. In case of emergency shutdown, all interlocking equipment in front of the belt conveyor in accident shall be shut down at the same time. The belt conveyor behind it continues to operate and stops successively after the material transportation is completed. Whether the materials on the belt conveyor have been transported or not depends on the material flow detection device. When no materials are measured, the device sends a signal to make the control center send the shutdown command of the belt conveyor.
3. Working principle:
The detection device is a gate structure, and the end of the swing rod is provided with a contact plate. When the material on the belt conveyor moves forward with the conveyor belt, it will push the contact plate on the detection device to swing forward. When the contact plate swings
When moving to 10 ° – 25 °, output light load signal; Output full load signal at 25 ° – 40 °; At 40 ° – 60 °, the overload signal is output. These signals can also be interlocked with the solenoid valve of the sprinkler through the control system to realize automatic watering when there is material.
Bidirectional pull rope switch
1. Structure of bidirectional pull rope switch:
It is composed of pull rope, lever, cam mechanism, normally open and normally closed contacts, metal shell, etc.
2. Function of two-way rope pull switch:
In case of emergency, emergency shutdown or accident of the belt conveyor, the staff can pull the pull rope of the two-way pull rope switch at any position to make the belt conveyor stop immediately. 3. Working principle of two-way rope pull switch:
The pull rope switch adopts a mobile cam mechanism and is sealed in a metal shell. When pulling either side of the pull rope switch or pulling the pull ropes on both sides at the same time, the cam moves to change the action of the switch and send out shutdown signal and alarm signal.
There are two types of two-way rope pulling switch: automatic reset type and manual reset type (manual reset is better for safety). That is, when the fault is eliminated and the staff confirms that the normal operation can be restored, pull up the reset lever, and then the transportation system can return to normal operation.
Audible and visual alarm
1. Structure of audible and visual alarm device:
It is composed of sound alarm and flash alarm. 2. Working principle of audible and visual alarm device:
The audible and visual alarm is sent to the power amplifier by the alarm signal source through the electronic confluence circuit, and the amplified signal pushes the horn to give an audible alarm. The flashing alarm adopts red glass lampshade with 360 ° omni-directional flashing.
3. Function of audible and visual alarm device:
It is used for start-up signal of belt conveyor interlocking system. Send audible and visual signals before operation to inform the personnel along the line to leave the equipment, and then start the equipment.
High coal level RF admittance controller
It is used in the coal conveying system to measure the coal blockage of chute and the high material level of raw coal bunker. 2. Principle:
The circuit unit transmits equipotential, same phase, same frequency (high frequency) and mutually isolated levels for the central rod and insulating layer. The stratum is connected with the container to be tested. In the circuit unit, the central rod and the container to be tested form a loop. When a material contacts the central rod, the loop is tested, and the circuit unit detects the change of the loop admittance (admittance is the reciprocal of impedance. RF admittance technology is the technology of measuring admittance with high-frequency current), Trigger the contact to close and output the alarm signal of point position in place.
Ft8010 RF admittance sensor is a point control instrument, that is, a discontinuous measuring instrument, which only detects a single point and gives an alarm. Its structure consists of three parts: circuit unit, shell and sensing element. The sensing element is a five layer concentric structure. The five layers from beginning to end are: central rod, insulating layer, shielding layer, insulating layer and stratum.
Zhengzhou Bai-ott New Material Co., Ltd was registered in 2008 as a specific export company in conveyor belt maintenance products system manufacturer. After more than 10 years development, till now we have four departments commit to product quality and service supervision from raw materials till after-sale service, which are R&D laboratory center comply with Chinese national standard, Product branch, Business branch and Engineering branch.Our one stop conveyor line maintenance products also developed to three complete systems can meet 80% of your requirements and product demand.