阅读说明：本技术 一种具有自动调节功能的原料系统上料装置 (Raw materials system loading attachment with automatically regulated function ) 是由 单盛秋 杨红星 闵育军 于 2020-05-08 设计创作，主要内容包括：本发明涉及一种具有自动调节功能的原料系统上料装置,所述上料装置包括若干个地下料仓和皮带秤,所述地下料仓上设置有流量阀和振动电机,所述皮带秤由一个皮带秤控制器、一个测速传感器、若干个称重传感器组成,所述皮带秤控制器控制测速传感器和称重传感器。该技术方案控制上料料流稳定在某一工艺要求范围内,既改善了上料精度又提高了上料效率。(The invention relates to a raw material system feeding device with an automatic adjusting function, which comprises a plurality of underground storage bins and a belt weigher, wherein a flow valve and a vibration motor are arranged on the underground storage bins, the belt weigher consists of a belt weigher controller, a speed measuring sensor and a plurality of weighing sensors, and the speed measuring sensor and the weighing sensors are controlled by the belt weigher controller. According to the technical scheme, the feeding material flow is controlled to be stable within a certain process requirement range, so that the feeding precision is improved, and the feeding efficiency is improved.)

1. The utility model provides a raw materials system loading attachment with automatically regulated function, its characterized in that, loading attachment includes a plurality of underground storage bin and belt weigher, be provided with flow valve and vibrating motor on the underground storage bin.

2. The automatic adjusting raw material system feeding device as claimed in claim 1, wherein the feeding device is arranged in a feeding device of a feeding system

The belt weigher comprises a belt weigher controller, a speed measuring sensor and a plurality of weighing sensors, wherein the belt weigher controller controls the speed measuring sensor and the weighing sensors.

3. The raw material system feeding device with the automatic adjusting function as recited in claim 2, wherein two variable frequency vibration motors are arranged on each underground storage bin.

4. The raw material system feeding device with the automatic adjusting function according to claim 3, wherein the flow valve controls the opening size through a 4-20mA signal of the PLC analog output module, meanwhile, a 4-20mA signal fed back by the actual opening of the flow valve is connected to the PLC analog input module, and the opening size of the flow valve controls the size of the feeding material flow of the feeding machine.

5. The raw material system feeding device with the automatic adjusting function according to claim 3 or 4, wherein the number of the weighing sensors is the same as that of the underground bins, namely, one weighing sensor is arranged in each underground bin.

6. The control method of the feeding device of the raw material system with the automatic adjusting function, which is provided by any one of claims 1 to 5, is characterized by comprising the following steps:

1) and (3) a normal mode: when a certain underground storage bin is fed by a feeder, firstly, a variable frequency vibration motor (running at 50 Hz) is started, and after a delay of several seconds, a flow valve is opened to a specified opening degree (program setting, empirical value obtained by debugging). When the deviation between the actual material flow and the process required material flow is large, the size of the material flow is adjusted through a flow valve, and when the deviation between the material flow is small, the size of the material flow is finely adjusted through a frequency converter; 2) failure mode: if the method of the invention can not be used due to the fact that the feedback of a flow valve or a retransmission sensor of a certain bin is failed, a failure mode can be adopted, at the moment, the flow valve controls the opening degree of the valve through pictures or on site, a frequency converter runs at power frequency, and the signal of the last weighing sensor at the downstream side in the material flow direction is adopted.

Technical Field

The invention relates to a feeding device, in particular to a raw material system feeding device with an automatic adjusting function, and belongs to the technical field of process control.

Background

The raw material feeding system is an indispensable link in a plurality of production units of metallurgical enterprises. Taking a raw material feeding system of a steel mill as an example, the feeding system consists of a plurality of underground storage bins, a plurality of belt conveyors and a high-position storage bin discharging trolley. With the increase of the steel-making production requirements, new problems are generated: originally every underground feed bin dress fixed material, feed bin discharge gate aperture all is transferred well and is fixed. However, different materials are required to be loaded in different time periods in the same underground storage bin at present, and due to the fact that the sizes, the shapes and the densities of the different materials are different, when the underground storage bin discharges materials to a belt, the material flow size difference is large. However, the material flow is required by the feeding system, the requirement of production rhythm cannot be met when the material flow is small, and the carrying capacity of the belt is exceeded when the material flow is too large, so that material scattering is caused, and the belt is damaged. Therefore, there is a need for a method of automatically adjusting the size of a feed stream to maintain the stream within a reasonable range. Other raw material feeding systems also suffer from the same or similar problems.

Disclosure of Invention

The invention provides a raw material system feeding device with an automatic adjusting function aiming at the problems in the prior art, and the technical scheme controls the feeding material flow to be stable within a certain process requirement range, thereby improving the feeding precision and the feeding efficiency.

In order to achieve the purpose, the technical scheme of the invention is that the raw material system feeding device with the automatic adjusting function is characterized by comprising a plurality of underground storage bins and a belt weigher, wherein the underground storage bins are provided with flow valves and vibrating motors.

As an improvement of the invention, the belt scale comprises a belt scale controller, a speed measuring sensor and a plurality of weighing sensors, wherein the belt scale controller controls the speed measuring sensor and the weighing sensors.

As an improvement of the invention, each underground storage bin is provided with two variable-frequency vibration motors.

As an improvement of the invention, the opening of the flow valve is controlled by a 4-20mA signal of a PLC analog output module, meanwhile, an actual opening feedback 4-20mA signal of the flow valve is connected to the PLC analog input module, and the opening of the flow valve controls the size of the feeding material flow of the feeding machine.

As a modification of the invention, the number of the weighing sensors is the same as that of the underground bins, namely, each underground bin corresponds to one weighing sensor. Because the belt vibration is great during batcher feeding, can influence weighing sensor's measurement accuracy, consequently weighing sensor and supporting weighing idler, frame all carry out the dislocation installation, all install under the adjacent storehouse of material flow direction downstream side, if the weighing sensor of 1# underground bunker installs under 2# underground bunker, analogize so, the place of about a storehouse is installed at its downstream side distance to the weighing sensor of the last underground bunker of material flow direction downstream side. In order to ensure the measurement precision of the belt weigher, the mounting modes and the mounting sizes of the weighing frames, the weighing carrier rollers and the weighing sensors of all the bins need to be completely the same, and the errors need to be as small as possible. The weighing sensor and the speed measuring sensor transmit measuring signals to the belt scale controller, and the belt scale controller sends 4-20mA flow signals to the PLC system. The selection of the weighing sensors of the blanking bins is determined by a weighing sensor selection loop. For a certain underground storage bin, two relays are controlled by two output points of the PLC digital quantity output module, then the two relays control the on-off of four normally open contacts, the four normally open contacts are respectively connected in series with the wiring of the four-wire weighing sensor corresponding to the bin and the belt scale controller, and the weighing sensor of each underground storage bin is treated in the same way.

A control method of a raw material system feeding device with an automatic adjusting function comprises the following steps:

1) and (3) a normal mode: when a certain underground storage bin is fed by a feeder, firstly, a variable frequency vibration motor (running at 50 Hz) is started, and after a delay of several seconds, a flow valve is opened to a specified opening degree (program setting, empirical value obtained by debugging). When the deviation between the actual material flow and the process required material flow is large, the size of the material flow is adjusted through a flow valve, and when the deviation between the material flow is small, the size of the material flow is finely adjusted through a frequency converter; 2) failure mode: if the method of the invention can not be used due to the fact that the feedback of a flow valve or a retransmission sensor of a certain bin is failed, a failure mode can be adopted, at the moment, the flow valve controls the opening degree of the valve through pictures or on site, a frequency converter runs at power frequency, and the signal of the last weighing sensor at the downstream side in the material flow direction is adopted.

Compared with the prior art, the invention has the advantages that 1, the material flow feedback of the traditional belt scale is delayed for a long time, the material flow of the invention is almost fed back in real time, and the abnormality can be found and treated in time; 2. the invention provides an accurate and effective feeding flow adjusting method, which has high precision and low cost, provides guarantee for the safe and stable operation of a belt conveyor, provides powerful guarantee for the production of raw materials, and can be widely popularized in a raw material feeding system; 3. the invention avoids the occurrence of excessive material flow, reduces the damage to the belt, prolongs the service life of the belt and reduces the maintenance cost of equipment; 4. the invention avoids the occurrence of small material flow, improves the running efficiency of the belt conveyor and saves the power consumption.

Drawings

FIG. 1 is a diagram of an in situ process layout of the present invention;

FIG. 2 is a PLC wiring diagram for load cell signal selection;

FIG. 3 is a schematic diagram of load cell signal selection;

FIG. 4 is a schematic diagram of a belt scale simulation signal path;

FIG. 5 is a flow chart of the operation and control of the present invention.

In the figure: 1. 1# underground bunker; 2. 2# underground bunker; 3. 3# underground bunker; 4. 4# underground bunker; 5. 5# underground bunker; 6. no. 6 underground bunker; 7. a flow valve; 8. a variable frequency vibration motor; 9. a weighing carrier roller; 10. 1# underground bunker weighing sensor; 11. 2# underground bunker weighing sensor; 12. 3# underground bunker weighing sensor; 13. 4# underground stock bin weighing sensor; 14. 5# underground bunker weighing sensor; 15. no. 6 underground bunker weighing sensor; 16. a speed measuring sensor; 17. a belt scale controller; 18. a feeding belt; 19. a return feeding belt; 20. a direction of flow; 21. a PLC digital quantity output module; 22. the connecting terminal is connected with the positive pole of the DC24V power supply; 23. the connecting terminal is connected with a DC24V power supply common terminal M; 24. 1# underground bunker weighing sensor signal selection relay (two relays in total); 25. a No. 2 underground bunker weighing sensor signal selection relay (two relays in total); 26. a 3# underground stock bin weighing sensor signal selection relay (two relays in total); 27. 4# underground bunker weighing sensor signal selection relay (two relays in total); 28. a No. 5 underground bunker weighing sensor signal selection relay (two relays in total); 29. a No. 6 underground bunker weighing sensor signal selection relay (two relays in total); 30. a connecting terminal of the belt scale controller is connected with signals of a four-wire system weighing sensor; 31. the 1# underground stock bin weighing sensor signal selects 4 normally open contacts of a relay, and is connected with four wires of the 1# underground stock bin weighing sensor; 32. 4 normally open contacts of a 2# underground stock bin weighing sensor signal selection relay are connected with four wires of a 2# underground stock bin weighing sensor; 33. 4 normally open contacts of a 3# underground stock bin weighing sensor signal selection relay are connected with four wires of a 3# underground stock bin weighing sensor; 34. 4 normally open contacts of a 4# underground stock bin weighing sensor signal selection relay are connected with four wires of a 4# underground stock bin weighing sensor; 35. 4 normally open contacts of a 5# underground stock bin weighing sensor signal selection relay are connected with four wires of a 5# underground stock bin weighing sensor; 36. 4 normally open contacts of a 6# underground stock bin weighing sensor signal selection relay are connected with four wires of a 6# underground stock bin weighing sensor; 37. a belt scale controller; 38. a PLC analog input module; 39. a load cell signal; 40. a tacho sensor signal; 41. a stream flow signal.

The specific implementation mode is as follows:

for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.

Example 1: as shown in FIG. 1, the feeding system has six underground bins 1-6 #. And the six underground storage bin feeders are internally provided with a flow valve which is named as a 1-6# flow valve respectively. Two variable frequency vibration motors are respectively installed on the six underground storage bin feeders. The belt weigher consists of a belt weigher controller, a speed measuring sensor and 6 weighing sensors. The weighing sensor of the No. 1 underground storage bin is arranged below the No. 2 underground storage bin, and the like, and the weighing sensor of the No. 6 underground storage bin is arranged at a position which is about one bin far downstream.

As shown in fig. 2 and 3, for 1# underground storage bin, two 1# underground storage bin weighing sensor signal selection relays are controlled by two output points of the PLC digital quantity output module, the on-off of four normally open contacts is controlled by the two relays, the four normally open contacts are respectively connected into the four-wire weighing sensor corresponding to the 1# underground storage bin and the wiring of the belt scale controller in series, when the two PLC output points are 1, the relays attract, the four normally open contact paths, the 1# underground storage bin weighing sensor is put into use, when the two PLC output points are 0, the relays do not attract, the four normally open contacts are opened, and the 1# underground storage bin weighing sensor is not put into use. The weighing sensors of other underground storage bins are put into use in the same way.

The operation and control flow of the present invention will be described in detail with reference to fig. 5. The 1-6# underground storage bin can be assumed to contain eight kinds of materials, namely lime, dolomite, iron ore, foam slag, sludge balls, pellet ore, sinter ore and ferric oxide. Before the equipment is put into use, a standard value of the material flow, such as 150 tons/hour, is determined according to the bearing capacity and production requirement of the belt conveyor. And debugging the optimal opening degree of the flow valve, which meets the material flow requirements, of each raw material under the 50Hz working condition of the frequency converter according to the standard value of the material flow. And then setting the original opening degree of each raw material flow valve in a PLC program according to each raw material code, wherein the original opening degree of the flow valve corresponding to lime is 70 percent if the flow valve corresponding to lime.

And (3) supposing that the No. 1 and No. 3 underground bins are filled with lime, the lime is fed from the No. 1 underground bin feeder according to a normal mode. Firstly, starting a belt conveyor in a linkage manner, then selecting an 'automatic material flow regulation system for use' on an operation picture, then setting a material code of lime, assuming that the material code is 8080, then starting a 1# underground bunker variable-frequency vibration motor, wherein the vibration motor runs at an original frequency of 50Hz, a flow valve is automatically opened to an original opening degree of 70% after the vibration motor is started and a weighing sensor corresponding to the 1# underground bunker is used. There are three possible cases of actual flow: 1. assuming an actual stream of 110 tons/hour, the requirement 1 is not satisfied: and (3) judging that the absolute value of the actual material flow-standard material flow (150 tons/hour) is less than or equal to 15 tons/hour, determining that the material flow deviation is large, automatically and gradually adjusting the opening of the flow valve until the requirement 1 is met, wherein the actual flow is 135 tons/hour, and because the requirement 2 is not met: and (3) judging that the absolute value of the actual material flow-standard material flow (150 tons/hour) is less than or equal to 3 tons/hour, and gradually increasing the working frequency of the frequency converter until the requirement 2 is met, wherein the material flow is still deviated to a certain extent. 2. Assuming an actual stream of 140 tons/hour, requirement 1 is met but requirement 2 is not met: the absolute value of the actual material flow-standard material flow (150 tons/hour) is less than or equal to 3 tons/hour, and the working frequency of the frequency converter is gradually increased until the requirement 2 is met, so that the material can be normally loaded. 3. Assuming that the actual flow is 148 tons/hour and the deviation from the standard flow meets the requirements 1 and 2, the flow is considered normal, and normal feeding is enough. In addition, if the weighing sensor, the flow valve feedback and the like related to the invention have faults, a fault mode can be adopted, and the 'automatic material flow regulation system is not used' is selected on the picture, so that the operation is performed according to the conventional method, and the detailed operation is shown in fig. 5.

It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.