阅读说明：本技术 一种煤炭分选重介质密度自动调节系统及工作方法 (Automatic adjusting system for density of coal separation dense medium and working method ) 是由 李凌月 周生伦 张宇龙 陈锋 董建立 常宪文 张博 屈江江 刘川 程思博 于 2019-08-07 设计创作，主要内容包括：本发明公开了一种煤炭分选重介质密度自动调节系统,包括与控制器连接的浓介桶、合格介质桶、重介质分选装置、分流箱和控制器,还包括,与控制器连接的加介阀门开度传感器、分流阀门开度传感器和补水阀门开度传感器；通过合格介质密度检测装置和合介桶桶位检测装置实时监测合格介质的密度和合介桶的桶位,并将测定结果输送到控制器中,由控制器对加介阀门、分流阀门和补水阀门的开度进行控制,实现密度系统的精准自动控制。本发明所述的系统在选煤厂应用后,可以缩短起测密度稳定时间,保证合格介质液密度的稳定,提高精煤回收率,降低劳动强度,系统通过数据的不断积累及优化,最终达到减少矸中带煤量和无人值守的目的。(The invention discloses an automatic regulating system for coal separation dense medium density, which comprises a dense medium barrel, a qualified medium barrel, a dense medium separation device, a flow distribution box and a controller which are connected with a controller, and further comprises a medium adding valve opening sensor, a flow distribution valve opening sensor and a water replenishing valve opening sensor which are connected with the controller; the density of the qualified medium and the barrel position of the medium-containing barrel are monitored in real time through the qualified medium density detection device and the medium-containing barrel position detection device, the measurement result is conveyed to the controller, and the controller controls the opening degrees of the medium adding valve, the flow dividing valve and the water replenishing valve, so that the accurate and automatic control of a density system is realized. After the system disclosed by the invention is applied to a coal preparation plant, the time for measuring density and stabilizing can be shortened, the stability of qualified medium liquid density is ensured, the recovery rate of clean coal is improved, the labor intensity is reduced, and the system finally achieves the purposes of reducing the coal quantity in gangue and unattended operation through continuous accumulation and optimization of data.)

1. An automatic dense medium density adjusting system for coal separation is characterized by comprising a dense medium barrel (1), a qualified medium barrel (2), a dense medium separating device (3), a flow distribution box (4) and a controller (5), wherein the dense medium barrel (1), the qualified medium barrel (2), the dense medium separating device (3) and the flow distribution box (4) are all connected with the controller (5); a qualified medium density detection device (6) is arranged on a qualified medium pipeline between the qualified medium barrel (2) and the dense medium sorting device (3), and the qualified medium density detection device (6) is connected with the controller (5); a medium combining barrel position detection device (7) is mounted on the qualified medium barrel (2) and used for measuring the barrel position of the qualified medium barrel (2), and the medium combining barrel position detection device (7) is connected with the controller (5); the medium adding valve of the concentrated medium barrel (1) is connected with a medium adding valve opening sensor (9), and the medium adding valve opening sensor (9) is connected with the controller (5) and used for accurately controlling the opening of the medium adding valve so as to control the addition amount of a medium; a shunt valve of the shunt box (4) is connected with a shunt valve opening sensor (10), and the shunt valve opening sensor (10) is connected with the controller (5) and used for accurately controlling the opening of the shunt valve so as to control the shunt amount of the medium; the water replenishing valve of the qualified medium barrel (2) is connected with a water replenishing valve opening sensor (8), and the water replenishing valve opening sensor (8) is connected with the controller (5) and used for accurately controlling the opening of the water replenishing valve so as to control the water replenishing amount.

2. The automatic dense medium density adjusting system for coal separation as claimed in claim 1, wherein the dense medium barrel (1), the qualified medium barrel (2), the dense medium separation device (3) and the diversion box (4) are connected in sequence.

3. An operating method of the automatic density adjusting system for the heavy media in coal separation according to claim 1 or 2, characterized in that the density of the qualified media and the position of the medium-combining barrel are monitored in real time by a qualified media density detecting device (6) and a medium-combining barrel position detecting device (7), the measured results are transmitted to a controller (5), and the opening degrees of a medium adding valve, a shunt valve and a water replenishing valve are controlled by the controller (5), so that the accurate automatic control of the density system is realized.

4. The working method of the automatic density adjusting system for the coal separation dense medium of claim 3 is characterized by comprising the following steps: the automatic density adjusting system for the coal separation dense medium detects the density of the qualified medium and the position of the medium combining barrel in real time, automatically sets a density target value of the qualified medium according to an analysis result, determines to increase or decrease the density according to a difference value between a set value of the density and an instantaneous value of the densimeter, and closes the shunt valve when the instantaneous value of the density is greater than the set value, the instantaneous density is too high, the density needs to be decreased, the opening degree of the water replenishing valve needs to be increased; when the instantaneous value of the density is smaller than the set value, the instantaneous density is too low, the density needs to be increased, and the opening degree of a water replenishing valve needs to be reduced; when the opening of the water replenishing valve is reduced and the density requirement cannot be met, closing the water replenishing valve and opening the shunt valve for shunting; in addition, when the quality of the medium in the qualified medium barrel (2) is insufficient, the medium can be automatically supplemented, so that the stability of the liquid density of the qualified medium is ensured, the intelligent control of a density system is realized, and the aims of reducing the coal quantity in the gangue and unattended operation are finally fulfilled.

Technical Field

The invention belongs to the technical field of coal washing and selecting, and particularly relates to an automatic density adjusting system for a coal sorting dense medium.

Background

With the continuous expansion of the production capacity of coal preparation plants, the large-scale equipment and the improvement of the complexity of the system, the requirements on automation technology and sensing systems are higher and higher. After the single machine automation of the equipment is realized, the foreign automatic coal separation technology is currently developed towards the direction of system automation and factory automation. Most foreign coal preparation plants have higher management level, more stable raw coal quality, strictly controlled washing quantity, stable operation of each process link, basically no leakage phenomenon, good production system condition and small change, so the realization of automation is relatively easy, and the condition of the system of the coal preparation plant in China is complicated. Researchers in China also do a lot of work in the aspect of automation of coal preparation plants, and the automation technology of the coal preparation plants in China roughly goes through three stages of relay logic control, program control of conductor elements and small-scale digital integrated circuits and PLC control. The automation of the coal preparation plant is not limited to the control of the production process, but plays a role in production management, and in the information era, the production management systems of industrial enterprises such as the coal preparation plant and the like are gradually developed towards networking, informatization and intellectualization. At present, the application of the automation technology of the domestic coal preparation plant is mainly embodied in the aspects of centralized control of equipment operation, monitoring and adjustment of process parameters, monitoring of the running state of the equipment and the like.

The centralized control of the equipment operation mainly comprises the operation of starting, stopping, accident stopping and centralized and local control conversion of the equipment of the coal preparation plant according to a preset flow. The process parameter monitoring and adjusting mainly monitors and adjusts the process parameters of the coal preparation plant according to the set value of the coal preparation index, heavy medium coal preparation is adopted in most of the coal preparation plant processes in China at present, the heavy medium index is mainly density adjustment of a coal preparation medium, for example, in the Chinese patent with the application number of 201621053343.5, the density monitoring method of the coal preparation medium generally adopts a density pot to manually carry out field actual measurement recording, and utilizes a radioactive source sensor to carry out online detection and a liquid difference sensor to carry out online detection. Due to the reasons that online measurement errors are large, radioactive sources are controlled strictly, the adjustment difficulty of a liquid difference sensor measurement technology is large and the like, most domestic coal preparation plants insist on using a manual field density pot for detection, then transmitting data to a control center after recording the data, starting an automatic density adjustment system by the control center for adjustment, and adopting automatic online detection in part of the coal preparation plants, but the detected data is only used as a reference for density adjustment, and the automatic density monitoring system does not automatically execute adjustment on the density adjustment according to density size information. Therefore, an accurate and stable dense medium density automatic regulating device is urgently needed by the coal preparation plant.

Disclosure of Invention

The invention aims to solve the problem that the dense medium density of a coal preparation plant cannot be accurately controlled, and provides an automatic dense medium density adjusting system, so that the dense medium density system of the coal preparation plant can be stably, accurately and quickly controlled.

The technical scheme adopted by the invention for solving the problems is as follows: an automatic dense medium density adjusting system for coal separation is characterized by comprising a dense medium barrel, a qualified medium barrel, a dense medium separating device, a flow distribution box and a controller, wherein the dense medium barrel, the qualified medium barrel, the dense medium separating device and the flow distribution box are all connected with the controller; a qualified medium density detection device is arranged on a qualified medium pipeline between the qualified medium barrel and the heavy medium sorting device and is connected with the controller; the qualified medium barrel is provided with a medium-combining barrel position detection device which is used for measuring the barrel position of the qualified medium barrel and is connected with the controller; the medium adding valve of the concentrated medium barrel is connected with a medium adding valve opening sensor, and the medium adding valve opening sensor is connected with the controller and used for accurately controlling the opening of the medium adding valve so as to control the addition amount of the medium; the shunt valve of the shunt box is connected with a shunt valve opening sensor which is connected with a controller and used for accurately controlling the opening of the shunt valve so as to control the shunt flow of the medium; the water replenishing valve of the qualified medium barrel is connected with a water replenishing valve opening sensor, and the water replenishing valve opening sensor is connected with the controller and used for accurately controlling the opening of the water replenishing valve so as to control the water replenishing amount.

Further, the dense medium barrel, the qualified medium barrel, the dense medium sorting device and the flow distribution box are connected in sequence.

The working method comprises the following steps: the density of the qualified medium and the barrel position of the medium-containing barrel are monitored in real time through the qualified medium density detection device and the medium-containing barrel position detection device, the measurement result is conveyed to the controller, and the controller controls the opening degrees of the medium adding valve, the flow dividing valve and the water replenishing valve, so that the accurate and automatic control of a density system is realized.

The automatic density adjusting system for the coal separation dense medium detects the density of the qualified medium and the position of the medium combining barrel in real time, automatically sets a density target value of the qualified medium according to an analysis result, determines to increase or decrease the density according to a difference value between a set value of the density and an instantaneous value of the densimeter, and closes the shunt valve when the instantaneous value of the density is greater than the set value, the instantaneous density is too high, the density needs to be decreased, the opening degree of the water replenishing valve needs to be increased; when the instantaneous value of the density is smaller than the set value, the instantaneous density is too low, the density needs to be increased, and the opening degree of a water replenishing valve needs to be reduced; when the opening of the water replenishing valve is reduced and the density requirement cannot be met, closing the water replenishing valve and opening the shunt valve for shunting; in addition, when the quality of the medium in the qualified medium barrel is insufficient, the medium can be automatically supplemented, so that the stability of the liquid density of the qualified medium is ensured, the intelligent control of a density system is realized, and the aims of reducing the coal quantity in the gangue and unattended operation are finally fulfilled.

Compared with the prior art, the invention has the following advantages and effects:

(1) the density measurement starting stabilization time is shortened, and the clean coal loss is reduced; the density is automatically adjusted, the dependence on post experience is reduced, and the density control operation is simpler and more convenient.

(2) The heavy medium sorting system is unattended, and the labor intensity is reduced.

(3) The system realizes stable product quality and improves the recovery rate of clean coal through continuous accumulation and optimization of data.

(4) Realize moisturizing valve automatic switch, reduced manual intervention, reduce personnel's demand.

(5) The coordination task is issued on line and fed back on line, so that the communication cost is reduced, and the information distortion is avoided; the medium adding requirement is formulated and judged, the system automatically identifies the optimal medium adding time, and sorting abnormity caused by insufficient medium quantity is avoided.

After the system disclosed by the invention is applied to a coal preparation plant, the time for measuring density and stabilizing can be shortened, the stability of qualified medium liquid density is ensured, the recovery rate of clean coal is improved, the labor intensity is reduced, and the system finally achieves the purposes of reducing the coal quantity in gangue and unattended operation through continuous accumulation and optimization of data.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an embodiment of the present invention.

In the figure: the dense medium barrel comprises a dense medium barrel 1, a qualified medium barrel 2, a dense medium sorting device 3, a shunt box 4, a controller 5, a qualified medium density detection device 6, a medium combination barrel position detection device 7, a water replenishing valve opening sensor 8, a medium adding valve opening sensor 9 and a shunt valve opening sensor 10.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.