The Z-weight hammer level meter can be used to measure the material level of powdery, granular and block solid materials in the silo, allowing users to reliably grasp the material level in the silo. The material level meter is composed of a sensor, a control display, and a recording instrument. The design of the sensor absorbs the advantages of similar products at home and abroad. Its unique structure and transmission mode eliminate the problems that often occur with many other forms of hammer-type material level meters in the past. overcome. It achieves reliable operation, low maintenance and wide application range. The control display adopts a series of single-chip microcomputer. The program controls the action of the entire detection process of the sensor and detects its signal, performs calculations, displays the material level number in the display window on the panel, and has a corresponding (no external connection required) analog current signal output, measurement It can be performed automatically at a scheduled time, or measured manually or controlled by a host computer. This material level meter field meter (primary meter) can be divided into two specifications: meters, meters and meters. The table has the function of displaying data and recording data, and can record data and communicate with the computer online through R communication transmission. Real-time data processing and storage.
Technical indicators of weight level meter
.Sensor
★Measurement range: meters, meters, meters
★Measurement accuracy: %
★Repeatability: %< br/>★Resolution
★Detection speed:./
★Measurement belt: stainless steel wire rope
★Detector weight
★Motor stalling torque:.
★ Power consumption: running // (related to motor selection)
★Ambient temperature: ℃+℃
★Weight
. Control display and recording instrument
★Power supply voltage: %HzHz
★Power consumption: at rest and in motion//
★Ambient temperature: ℃+℃
★Digital display: bit
★Current output: (no additional addition required)
★Current output signal accuracy: %
★Timing time: minutes (or according to user requirements)
★Maximum distance from sensor
★Data recording and communication functions: real-time data recording, with R communication function
★Super large screen direct display: For the convenience of customers, customers can customize the super large screen to display data
★Weight
Note: Wiring method: The control box feet correspond to the material level meter feet, and the main control Box feet, transmission function feet, power supply
Working principle of weight level meter
The detection process of the level meter sensor installed on the top of the silo is controlled by the signal sent by the control display and recording instrument. The sensor consists of a reversible motor, reducer, screw, gear shaft, bobbin, sensitive lever, etc. When the sensor receives the detection command: the motor rotates forward, and the gear shaft and bobbin are driven by the reducer to rotate, so that the wire rope is lowered, and the detector is driven down from the roof of the warehouse. When the detector drops to the material surface, it is lifted up by the material surface and loses weight. The wire rope is relaxed, and the sensitive lever action makes the micro switch contact. The control display recorder receives the signal and immediately sends a motor rotation command. The detector rises and returns until the winding. When the drum hits the top switch, the motor stops transmitting, and the detector returns to its original position on the top of the bin, completing a detection process. During this process, the control display recording instrument calculates the distance from the bottom of the silo to the material surface by detecting the number of revolutions of the bobbin, performs digital display on the panel, and outputs current on the rear panel terminals. (No additional addition required)
Installation and wiring of weight level gauge
. Installation of primary meter
Choose a suitable location for installing the material level gauge on the top of the silo: the selection of measuring points should avoid The feeding port and the unloading port should be selected at positions that are approximately equal to the same height measurement during the loading and unloading processes. On domed cement and fly ash silos, the installation location should be selected as the installation location away from the soot blowing pipe, not in a straight line with the soot blowing pipe, and a radius distance from the center of the silo roof. In the pulverized coal bin of the power plant, in order to better compare the data with the original hand-cranked detector, a location closer to the original hand-cranked detector should be selected.
It is required that there be no iron frame or other debris under the measurement point to avoid hindering the measurement.
Prepare flanges, steel pipes and steel plates. This plate is not used on the iron silo roof, but should be prepared on the cement silo roof. Make a hole in the iron plate, the hole diameter = the outer diameter of the iron pipe =. If the silo is in the open air, a frost-proof cover needs to be added. Therefore, the height after being fixed to the top of the silo is required to be about 10,000 feet. If there is a house, it can be lengthened to
Welding
Iron silo roof: Weld the flange and the iron pipe, making sure they are perpendicular to each other. Open a hole at an appropriate position on the top of the warehouse, with the hole diameter = the outer diameter of the iron pipe. Weld the iron pipe to the round hole on the top of the warehouse. Make sure to use a spirit level to find the level.
Cement silo roof: Weld the flange, iron pipe and iron plate, making sure they are perpendicular to each other. Open a hole at an appropriate position on the top of the warehouse, with a diameter of about 100%. Then put the iron plate on the hole and fix it to the top of the cement silo. It is recommended to seal it with concrete. When installing, you should also pay attention to the relative position of the square shape of the material level meter and the four holes of the flange. To ensure that the material level has a suitable angle on site.
Install the meter once
Remove all the locking screws, steel pipes and detectors on the reserved wire rope at the bottom of the meter.
Put the wire rope through the dust removal bracket and fix the material level meter on the dust removal bracket.
Put the wire rope through the middle hole of the locking screw, put the detector on the shaped steel pipe, then pass the wire rope out of the shaped steel pipe, and finally pass the wire rope through the lock Tighten the middle hole of the screw, tighten the nut, compress the wire rope, put the wire rope and detector into the bin, and fix the instrument.
The length of the wire rope must ensure that the detector is below the warehouse roof. First, measure the thickness of the warehouse roof. The thickness of the warehouse roof + is the length that should be left.
First time meter inspection
The cover should be opened for careful inspection while the power is off.
.The wire rope should be wound around the large drum and arranged neatly, and should pass correctly between the two guide wheels.
b. Check the bottom switch
. Check the top switch
Use a multimeter to measure the terminals. In the normal stationary state for detection, the detector should be at the top, and the roller is in contact with the top switch, and the connection is connected. state.
.Wiring
The first time the level meter is connected to the power supply, the initial data measured by the level meter is invalid data. The measured data must be valid the second time the level meter is started. On the front panel, the left is the power indicator light (red)
The following three indicator light switches: yellow manual reset switch red forward and reverse control green start measurement control box foot corresponds to the material level meter, the foot pin is connected to the main control box Send output, press the power button
The smart meter is capable of receiving real-time curves and data. The operation method is as follows
Press the up direction key or the down direction key to switch the real-time curve of each channel, adjust the percentage value of the curve ruler and the size of the scale. Press the left direction key or the right direction key to move the cursor and switch between the unselected state, channel number, curve scale percentage, and time scale respectively. Press the icon switch key to switch to the alarm list screen. Smart instrument data backup The instrument can intelligently compare To back up the data detected by each channel, you need to set the backup time before backing up. Note that the start time cannot be greater than the end time.
Operation and Maintenance
First, confirm that the instrument is installed and wired correctly, and then turn on the power. Under normal circumstances, the digital display., the output current is, then the detection conditions are met
Manual detection
Press the manual detection button to perform a detection. The process is as follows: the motor drives the detector down, and the digital display changes from full to full. The measuring range gradually decreases until the detector touches the material surface and the number no longer decreases. The number at this time is the height of the material surface in the silo. The detector automatically returns to the top of the warehouse. During the return process, the numbers flash. When the detector returns to the top of the warehouse, the numbers stop flashing. The current output value reflects the corresponding material level height, and the current output value will be maintained for one detection cycle. Clean the bracket, use brushes and other tools to sweep out the dust inside, and regularly inject glycerin into the gears and screws once every three months (low-temperature resistant glycerin is best)
Automatic detection
According to D Depending on the different timing times set by the switch, the instrument will automatically detect at certain intervals. , enter the wire rope replacement procedure. At this time, there is no detection function, and the maintenance personnel can go to the warehouse top to replace the wire rope. ※ It is recommended to use the manual method to reduce the number of detections and extend the operating life.
Attention
During the detection process, since the detector is running in the silo, be careful not to cut off the power, otherwise the detector
staying in the silo will easily cause a buried detector and malfunction. If the detector stops at the position where the power was cut off, when the power is restored, the motor will automatically first lift the detector to the position on the top of the bin, and then perform the detection action. Try to avoid detection during the blanking process to reduce the chance of burying the detector.
Dust cleaning method and oil filling When the instrument is used in dusty situations, the inside of the box and the dust removal switch position should be regularly cleaned according to the situation
When the detector wants to rise to the top normally, the top switch operates first, and the power supply is protected The switch does not operate. If the top switch fails, the power protection switch operates to cut off the power supply and the motor stops to prevent damage to the motor.
How to replace the wire rope
The service life of the wire rope is related to the number of detections per day. Check the wire rope after half a year to one year to see if there are any local injuries, burrs, etc. If any damage occurs, please replace it in time to prevent the wire rope from breaking and causing the detector to fall into the warehouse.
● The operating principle is: manually press the micro switch on the detector box to manually control
the forward and reverse rotation of the motor, so as to achieve the purpose of conveniently replacing the wire rope.
● The operating rules are: first press the bottom switch to make the motor rotate once, and the drum will disengage from the top switch
Then press the top switch to make contact, the motor will rotate forward, and the drum will rotate in the direction of releasing the rope. And move to the right
Press the switch to the bottom to make it contact, the motor will reverse, the drum will turn in the direction of the rope and move to the left
If both switches are in contact or neither of them is in contact, the motor will not rotate. .
● The operation method is: pull the lower end of the old wire rope by hand, manually press the top switch, rotate the drum, and remove the old wire rope. Before winding the new wire rope, the drum should be moved to a suitable position on the right side, between the inner edge of the drum and the center distance of the small pulley (refer to the original wire rope position comparison). Screw one end of the new wire rope buckle to the leftmost part of the drum. starting point. Before winding a new wire rope, it must be fully relaxed so that it can stretch smoothly and avoid injury. Tighten the wire rope and align it with the small pulley. Press the bottom switch manually. The drum rotates and the wire rope is wound around the drum. When the top switch is touched by the drum, the motor automatically stops. Cut the wire rope to the required length and press it by hand. Hold the rope on the drum to prevent it from moving, pass the rope head through the two guide wheels and the hole, and then complete the rope changing work according to the method in installing the primary meter in this manual. Turn off the power to the secondary meter, and remove the dial switch from the Return to original state and power on again.
Weight level meter