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Manufacturing method of automatic weighing and feeding device


source:[Gravimetric blender]   release time:2021-03-19 13:48:26





Manufacturing method of automatic weighing and feeding device

[Abstract] An automatic weighing and feeding device, including a silo, the bottom of the silo is equipped with a silo bottom flapper valve, and also includes a DCS controller, a frame, and a two-way running belt conveyor installed in the frame. The frame above the two-way running belt conveyor is equipped with a two-way passing guide trough, and a frequency conversion air lock rotary discharge valve or a frequency conversion vibration is arranged from top to bottom between the two-way passing through the guide trough and the silo bottom flapper valve. Feeders, expansion joints, the lower part of the left and right sides of the frame are equipped with unloading flapper valves, and the left and right outlets are provided on the left and right sides of the bottom of the frame respectively. The positions of the left and right outlets and the two-way operation belt type The left and right ends of the conveyor correspond to each other. The utility model is convenient for inspection and maintenance, does not sprinkle materials, and the tape does not adhere to the materials. The weighing accuracy is high, and the silo can be unloaded when the downstream equipment stops running.

Automatic weighing and feeding device
Technical field
[0001] The present utility model relates to the field of feeding, in particular to a solid material feeding device.
【Background technique】
[0002] In the chemical, power station, metallurgy, mining, coal, port and other industries, the use of weighing feeders for large solid storage bins is one of the commonly used equipment, which has the following layout structures and problems:
[0003] 1. The bottom of the silo is directly connected to the belt weighing feeder, and the materials are directly piled on the belt weighing feeder. When the belt weighing feeder fails and needs to be replaced, the belt needs to be manually removed. For the materials on the feeder and in the silo, the maintenance period is long and the maintenance cost is high;
[0004] 2. The bottom of the silo is connected to the belt weighing feeder through the flapper valve, the flapper valve opens after the belt weighing feeder starts to travel, and the flapper valve before the belt weighing feeder stops running When the belt weighing feeder is shut down due to material failure and the tape needs to be replaced, manually close the flapper valve and clear the material piled on the weighing feeder. This method is cheaper than the first maintenance period, and is also a common layout structure. However, for powdery materials, fluidization and air cannons are often used in the silo to prevent blockage and bridging. The material at the bottom of the silo contains gas, so When the plate valve is opened, the material will impact the belt weighing feeder, causing dust and scattering in the feeder, serious material burying of the feeder and motor overload and other problems, affecting safety and production;
[0005] 3. The belt weighing feeder adopts a belt conveyor with corrugated sidewalls in order to prevent the material from being scattered, and a cleaner cannot be installed at the discharge roller. Some materials with high humidity or viscous often stick to the conveyor belt. Or caught in the wavy ribs and cannot be removed in time, making the weighing inaccurate;
[0006] 4. The belt weighing feeder is equipped with a scraper cleaner at the bottom in order to prevent the spilled material from accumulating in the weighing feeder, which increases the cost of the equipment;
[0007] 5. The belt weighing feeder is tail feeding, and the material enters the downstream mill and other equipment after the head is discharged, and the two ends can not be discharged in both directions. If lignite or highly volatile materials are stored in the silo, there is the possibility of spontaneous combustion for a long time, or the materials that are easy to absorb water and damp and compact, if the downstream device is stopped, the materials are not allowed to be stored in the silo for a long time, and there is no way to pass the bottom Emergency unloading of belt weighing feeder.
[Utility model content]
[0008] The purpose of the present utility model is to provide an automatic weighing and feeding device, no need to manually remove the materials piled on the belt weighing feeder and in the silo, effectively preventing dust flying and scattering in the feeder .
[0009] The technical solution of the utility model is:
[0010] An automatic weighing and feeding device, including a silo, the bottom of the silo is provided with a silo bottom flapper valve, and also includes a DCS controller, a frame, and a two-way running belt conveyor installed in the frame, The frame above the two-way running belt conveyor is equipped with a two-way passing guide trough, and a frequency conversion air lock rotary discharge valve or a frequency conversion vibration is arranged from top to bottom between the two-way passing through the guide trough and the silo bottom flapper valve. Feeders, expansion joints, the lower part of the left and right sides of the frame are equipped with unloading flapper valves, and the left and right outlets are provided on the left and right sides of the bottom of the frame. The left and right ends of the conveyor correspond to each other. The two unloading flapper valves are located at the left and right outlets respectively. The two-way running belt conveyor is equipped with a speed sensor and a weighing sensor, and the weighing sensor is connected with weighing processing. The frequency converter, the frequency conversion air lock rotary discharge valve or the frequency conversion vibration feeder are connected with the frequency converter, and the speed sensor, weighing processor, and frequency converter are all controlled and connected with the DCS controller.
[0011] Both the left and right ends of the two-way running belt conveyor are provided with N-type cleaners on the lower sides.
[0012] The load cell is located below the upper belt surface of the two-way running belt conveyor.
[0013] The speed sensor is located below the lower belt surface of the two-way running belt conveyor.
[0014] In the transverse direction, the left and right outlets are located away from the corresponding left and right ends of the two-way running belt conveyor.
[0015] The silo is provided with a fluidized plugging gas inlet.
[0016] The utility model is convenient for inspection and maintenance, does not scatter materials, and the tape does not adhere to materials. The weighing accuracy is high, and the silo can be unloaded when the downstream equipment stops running.
[0017] The silo bottom flapper valve and the discharge port flapper valve are manual/electric integrated flapper valves with valve opening/closing in-position signals, and automatic tensioning sealing packing is provided between the valve body and the valve plate, It can prevent the circulation of gas and dust inside and outside.
[0018] The expansion and energy saving above the belt conveyor absorb the installation error due to height and horizontal direction, which brings convenience to installation and debugging.
[0019] The frequency conversion air lock rotary discharge valve/frequency conversion vibration feeder are respectively suitable for dry powder materials containing gas and airless wet materials, which can prevent the leakage of powder caused by gas movement, and can also control the feeding The material quantity meets the design requirements.
【Explanation of the drawings】
[0020] FIG. 1 is not intended for the structure of the present invention.
【detailed description】
[0021] As shown in FIG. 1, an automatic weighing and feeding device of the present invention includes a silo I, and the silo I is provided with a fluidized cleaning gas inlet. The bottom of the silo I is provided with a silo bottom plug-in valve 2.
[0022] The utility model also includes a DCS controller 13 and a frame 7, a two-way running belt conveyor 6 installed in the frame 7. The two-way running belt conveyor 6 is referred to as a belt conveyor, and a two-way running belt conveyor The frame 7 on the upper left side of the machine 6 is provided with a two-way passage guide groove 5, and a frequency conversion air lock rotary discharge valve ( Or frequency conversion vibrating feeder) 3. Expansion joint 4. The lower part of the left and right sides of the frame 7 are equipped with discharge flapper valves 9, and the bottom and left of the frame 7 are respectively provided with left and right outlets, in the horizontal The upper, left and right outlets are located far away from the corresponding left and right ends of the two-way running belt conveyor 6.
[0023] The positions of the left and right outlets correspond to the positions of the left and right ends of the two-way operating belt conveyor 6. Two unloading flapper valves 9 are located at the left and right outlets respectively, and the two-way operating belt conveyor 6 A speed sensor 10 and a weighing sensor 11 are arranged there, and the weighing sensor 11 is connected with a weighing processor 12, and the weighing sensor 11 is located below the upper belt surface of the two-way running belt conveyor 6. The speed sensor 10 is located below the lower belt surface of the two-way running belt conveyor 6.
[0024] The frequency conversion air-locking rotary discharge valve 3 or the frequency conversion vibration feeder is connected with the frequency converter, and the speed sensor 10, the weighing processor 12, and the frequency converter are all controlled and connected with the DCS controller 13 in the control room.
[0025] Both the left and right ends of the two-way running belt conveyor 6 are provided with N-type cleaners 8 on the lower sides.
[0026] Specifically:
[0027] The belt conveyor 6 is a general-purpose device driven by a fixed-frequency motor equipped with a slip check, an anti-deflection detection, and a rope switch. The roller is a trough type, and the tape is a smooth flat tape.
[0028] The head roller and the tail roller of the belt conveyor 6 are both discharge rollers, an N-type cleaner 8 is installed at the bottom of the roller, and a screw tensioning device is installed at the tail roller.
[0029] The drive roller of the belt conveyor 6 is used as the head roller, and the drive device realizes forward and reverse rotation by switching the circuit controller to meet the requirement of unloading materials from the head to downstream equipment, and can also unload materials from the tail for loading and transport out of vehicles. To prevent the long-term storage of materials in the silo from causing danger.
[0030] The silo bottom flapper valve 2 and the discharge port flapper valve 9 are manual/electric integrated flapper valves with valve opening/closing signals, and an automatic tensioning seal is provided between the valve body and the valve plate Packing can prevent the flow of gas and dust inside and outside.
[0031] The expansion joint 4 above the belt conveyor 6 can absorb installation errors due to height and horizontal direction, which brings convenience to installation and debugging.
[0032] The frequency conversion air lock rotary discharge valve 3 / frequency conversion vibration feeder are respectively suitable for dry powder materials containing gas and airless wet materials, can prevent the leakage of powder caused by gas movement, and can also control The feed volume meets the design requirements.
[0033] The weighing sensor 11 and a speed sensor 10 both transmit signals to the weighing processor through a data line.
[0034] The weighing processor comprehensively processes the signals of the weighing sensor and the speed sensor and transmits the obtained weighing data signal (instantaneous amount/cumulative amount) to the FFY controller of the control room DCS through the data line. The FFY controller compares the received instantaneous amount with the set amount and then controls the frequency conversion air-locking rotary discharge valve/frequency conversion vibration feeder to run fast, so as to ensure the actual feeding amount and the set amount of the automatic weighing and feeding device Unanimous.
[0035] Although the preferred embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned [specific embodiments], and the above-mentioned [specific embodiments] are merely illustrative, not Restrictively, under the enlightenment of this utility model, those of ordinary skill in the art can also make many specific transformations without departing from the scope of protection of the utility model. These all fall within the scope of protection of this utility model. Inside.
【Sovereignty Item】Gravimetric blender
1. An automatic weighing and feeding device, including a silo, the bottom of the silo is provided with a silo bottom plug-in valve, which is characterized in that it also includes a DCS controller, a frame, and a two-way running belt installed in the frame Conveyor, two-way operation The frame above the belt conveyor is equipped with a two-way passing guide trough, two-way passing between the guide trough and the silo bottom inserting plate valve, from top to bottom, there is a frequency conversion air lock rotary discharge valve Or variable frequency vibrating feeder, expansion joint, the lower part of the left and right sides of the frame are equipped with unloading flapper valves, and the left and right outlets are respectively provided at the bottom and left of the bottom of the frame. The positions of the left and right outlets are bidirectional The left and right ends of the running belt conveyor correspond to each other. The two unloading flapper valves are located at the left and right outlets respectively. The two-way running belt conveyor is equipped with a speed sensor and a load cell. The load cell is connected with The weighing processor, the frequency conversion air lock rotary discharge valve or the frequency conversion vibration feeder are connected to the frequency converter, and the speed sensor, weighing processor, and frequency converter are all connected to the DCS controller. 2. An automatic weighing and feeding device according to claim 1, characterized in that: the lower sides of the left and right ends of the two-way running belt conveyor are equipped with N-type cleaners. 3. An automatic weighing and feeding device according to claim 1 or 2, characterized in that: the weighing sensor is located below the upper belt surface of the two-way running belt conveyor. 4. An automatic weighing and feeding device according to claim 1 or 2, characterized in that the speed sensor is located below the lower belt surface of the two-way running belt conveyor. 5. An automatic weighing and feeding device according to claim 1 or 2, characterized in that: in the transverse direction, the left outlet and the right outlet are located away from the corresponding left and right ends of the two-way running belt conveyor. 6. An automatic weighing and feeding device according to claim 1 or 2, characterized in that: the silo is provided with a fluidization cleaning gas inlet.[Gravimetric blender]