CN101807062A

CN101807062A - Stock bin control system

Info

Publication number: CN101807062A
Application number: CN 201010121685
Authority: CN
Inventors: 王卫红; 李佳峰; 李晓峰
Original assignee: Sinosteel Anshan Research Institute of Thermo Energy Co Ltd
Current assignee: Sinosteel Anshan Research Institute of Thermo Energy Co Ltd
Priority date: 2010-03-11
Filing date: 2010-03-11
Publication date: 2010-08-18

Abstract

The invention relates to a stock bin control system, which comprises a weighting sensor, a programmable controller and a display instrument. The weighting sensor is arranged under a supporting seat of the stock bin, the programmable controller is respectively connected with the weighting sensor and the display instrument through a shielded cable, and a standard 4-20mA signal transmission is adopted for the weighting sensor, the programmable controller and the display instrument. The weighting sensor is generally set with 3-4 points. The stock bin control system is characterized by indirectly measuring the material level of the material stock in the stock bin by means of weighing, and calculating the material flow rate through the weight change to accurately determine the condition of the material discharge and jamming. The invention has the advantages that: the method of weighing is adopted to directly measure the material level of the material stock in the stock bin and the material flow rate is calculated through the weight change to accurately determine the condition of the material discharge and jamming, thereby solving the problems of easy damage and failure of the contact charge level indicator and the non-contact charge level indicator and the infidelity of the measured result, and particularly solving the problem of detection of jamming in the discharge port.

Description

A kind of feed bin control system

Technical field

The present invention relates to the control system of the detection of a kind of bin-level measurement and discharging obstruction.

Background technology

At present, the version of feed bin mainly contains opened type and closed two kinds, and the material state in the feed bin can be solid, liquid and gas.

1, at not material dielectric property, the detection of material level has contact and contactless two kinds of metering systems usually.All there are some disadvantages in these two kinds of metering systems, and as the contact level-sensing device, detecting element will contact with material, are easy to damage in the occasion of thump.

Contactless level-sensing device, be to meet the material back reflection by the probe divergent-ray of detecting element, and the material level of definite material, but in strong dust, the strong occasion that adheres to, its detection probe is easy to covered, so just can't survey the material position, and feeding port is when a side of feed bin, the interface of material can form angle of rest (repose), causes material level to detect distortion.

2, the material medium for storage is the feed bin of bulk or powdery, and in order to control discharge rate, discharge port is often made one section oblique straight section, when the feed bin discharging, discharging opening is easy to stop up, and can have a strong impact on production in case putty takes place, and bring very burden to maintenance.Almost there is not detection means now for the discharging latch up phenomenon.

Summary of the invention

The objective of the invention is at the problems referred to above, a kind of feed bin control system is provided,, and accurately judge the discharging stopping state by materials flow speed by the employing indirect reaction material warehousing material situation of mode of weighing.

For achieving the above object, the present invention is achieved through the following technical solutions:

A kind of feed bin control system, comprise LOAD CELLS, Programmable Logic Controller, Displaying Meter, LOAD CELLS is arranged under the feed bin bearing, Programmable Logic Controller links to each other with LOAD CELLS, Displaying Meter by shielded cable respectively, employing standard 4～20mA signal transmission between LOAD CELLS, Programmable Logic Controller, the Displaying Meter.

Described LOAD CELLS is provided with 3～4 points.

Described a kind of feed bin control system is characterized in that, by the employing indirect measuring and calculating feed bin material stock material level of mode of weighing, and the change calculations materials flow speed by weight is with accurate judgement discharging stopping state, and its concrete control mode is as follows:

Feed bin weight when 1) at first determining hole capital after selling all securities, weight when buying securities with all one's capital, Programmable Logic Controller adds up the weight signal that LOAD CELLS transmits then, with the weight linearization of the signal after adding up according to the feed bin design, hole capital after selling all securities weight is set at minimum value 0, and output signal is 4mA, the weight of buying securities with all one's capital is made as maximal value 100, output signal is 20mA, and Displaying Meter receives 4～20mA signal of Programmable Logic Controller, shows that the material level value is 0～100%;

2) during discharging, the variation of weight in the Programmable Logic Controller unit of account time, calculate discharge rate:

v = \frac{w_{2} - w_{1}}{t_{2} - t_{1}}

In the formula: the v-discharge rate

w _x-measurement weight

t _x-Measuring Time

When measuring weight＞hole capital after selling all securities weight, discharge rate v is 0 o'clock, shows that drain hole stops up, and sends alerting signal, and the prompting site operation personnel in time handles discharge port.

Compared with prior art, the invention has the beneficial effects as follows: by the employing indirect measuring and calculating feed bin material stock material level of mode of weighing, and the change calculations materials flow speed by weight is with accurate judgement discharging stopping state, having solved contact in the prior art or contactless level-sensing device damages easily and lost efficacy and the problem of measurement result distortion, especially solved the detection difficult problem that discharge port stops up, be adapted at applying on the various forms of feed bins.

Description of drawings

Fig. 1 is an embodiment of the invention structural representation.

Among the figure: 1-LOAD CELLS 2-Programmable Logic Controller 3-Displaying Meter 4-feed bin 5-bearing 6-shielded cable 7-shedding mechanism 8-discharge port 9-industrial computer 10-switch 11-control system

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further:

See Fig. 1, a kind of feed bin control system, comprise LOAD CELLS 1, Programmable Logic Controller 2, Displaying Meter 3, LOAD CELLS 1 is arranged on feed bin 4 bearings 5 times, shedding mechanism 7 is arranged on silo discharge port 8 places, for preventing electromagnetic interference (EMI), Programmable Logic Controller 2 by two core shielded cables 6 respectively with LOAD CELLS 1, Displaying Meter 3 links to each other, LOAD CELLS 1, Programmable Logic Controller 2, employing standard 4～20mA signal transmission between the Displaying Meter 3, the input of all signals, output all is for control 2 able to programme, be that LOAD CELLS 1 is passed to Programmable Logic Controller 3 and is input signal, it is output signal that Programmable Logic Controller 2 is given Displaying Meter 3.LOAD CELLS 1 general 3～4 points.Programmable Logic Controller 2 is furnished with communication interface, the feed bin situation can be sent to industrial computer 9 by switch 10 and realize showing and reporting to the police; Send the upper and lower production link control system 11 of feed bin to, realize the whole-course automation control of material.

A kind of feed bin control system of the present invention, by the employing indirect measuring and calculating feed bin material stock material level of mode of weighing, and the change calculations materials flow speed by weight is with accurate judgement discharging stopping state, and its concrete control mode is as follows:

v = \frac{w_{2} - w_{1}}{t_{2} - t_{1}}

In the formula: the v-discharge rate

w _x-measurement weight

t _x-Measuring Time

When measuring weight＞hole capital after selling all securities weight, discharge rate v is 0 o'clock, show that drain hole stops up, send alerting signal,, change the sensitivity of its calculating at material of different nature, when v goes to zero, the prompting site operation personnel in time handles discharge port, or directly gives the shedding mechanism stop signal, stops discharging.The invention solves contact in the prior art or contactless level-sensing device and damage easily and lost efficacy and the problem of measurement result distortion, especially solved the detection difficult problem of discharge port obstruction, be adapted at applying on the various forms of feed bins.

Claims

1. feed bin control system, it is characterized in that, comprise LOAD CELLS, Programmable Logic Controller, Displaying Meter, LOAD CELLS is arranged under the feed bin bearing, Programmable Logic Controller links to each other with LOAD CELLS, Displaying Meter by shielded cable respectively, employing standard 4～20mA signal transmission between LOAD CELLS, Programmable Logic Controller, the Displaying Meter.

2. a kind of feed bin control system according to claim 1 is characterized in that described LOAD CELLS is provided with 3～4 points.

3. the described a kind of feed bin control system of claim 1 is characterized in that, by the employing indirect measuring and calculating bin-level of mode of weighing, and the change calculations materials flow speed by weight is with accurate judgement discharging stopping state, and its concrete control mode is as follows:

v = \frac{w_{2} - w_{1}}{t_{2} - t_{1}}

In the formula: the v-discharge rate

w _x-measurement weight

t _x-Measuring Time