CN201654527U

CN201654527U - Storage bin control system

Info

Publication number: CN201654527U
Application number: CN2010201280952U
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: 2010-11-24
Anticipated expiration: 2020-03-11

Abstract

The utility model relates to a storage bin control system which comprises a weighing sensor, a programmable logic controller and a display instrument, wherein the weighing sensor is arranged below the support of the storage bin; the programmable logic controller is connected with the weighing sensor and the display instrument respectively through screened cables; standard 4-20mA signal transmission is adopted among the weighing sensor, the programmable logic controller and the display instrument; and the weighing sensor is generally provided with 3 or 4 sensing points. The utility model has the benefits that the level of stored materials in the storage bin is indirectly measured in a weighing way, and according to the change in weight, the flow rate of the materials can be calculated so as to accurately judge the blockage circumstance of the discharging, which solves the problems of easy damage and failure and distorted measurement result of the contact-type material level mater or the non-contact-type material level meter in the prior art, particularly the difficulty of blockage detection of an discharge opening.

Description

A kind of feed bin control system

Technical field

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

For achieving the above object, the utility model 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 operated by rotary motion 3～4 points.

Compared with prior art, the beneficial effects of the utility model are: 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 the utility model example structure synoptic diagram.

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 embodiment of the present utility model 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 operated by rotary motion 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.

The utility model, 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, 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 utility model has solved contact in the prior art or contactless level-sensing device and has damaged easily and lost efficacy and the problem of measurement result distortion, has especially solved the detection difficult problem of discharge port obstruction, is 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.