CN-121978360-A - Coal rock sample preparation device and intelligent discrimination method

CN121978360ACN 121978360 ACN121978360 ACN 121978360ACN-121978360-A

Abstract

The invention provides a coal rock sample preparation device and an intelligent judging method, and belongs to the technical field of coal rock physical property testing. The device comprises a constant temperature and humidity box, a humidity control system and a sample processing and weighing system. The electric lifting platform in the sample processing and weighing system realizes the separation of the sample dish and the sample rotating disc during weighing through lifting action, and the weighing precision is ensured. The central control and data acquisition system manages full-automatic lifting-rotating-descending-weighing circulation through a finite state machine model, and an intelligent algorithm is adopted to automatically judge whether the sample reaches moisture balance by judging whether the quality change of the sample continuously for multiple times is smaller than a preset threshold value. The method is implemented in a central control and data acquisition system. The method overcomes the defects of low efficiency, easy interference on precision, strong subjectivity in balance state judgment and the like of the traditional method, and realizes batch, automation and intellectualization of the preparation of the coal-rock balance moisture sample.

Inventors

YANG JIANGHAO
CHEN BOYUAN
JIANG YANG
MA LITAO
LIU CHENG
GAO LIJUN
ZHOU JIAYI
ZHANG BO
LIU XUEQING
LI YANGBING

Assignees

中海油能源发展股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260212

Claims (10)

1. A coal rock sample preparation device, comprising: A constant temperature and humidity box (1), the interior of which is divided into an upper working chamber (3) and a lower humidity control chamber (4) by a partition board (2); The humidity control system comprises a constant humidity generating device and an active humidifying device, wherein the constant humidity generating device is arranged in the lower humidity control chamber (4), and the active humidifying device is arranged outside the constant temperature and humidity box (1); Sample processing and weighing system locates in upper portion working chamber (3), includes: an electronic balance (9); The sample rotating disc (10) is provided with a plurality of evenly distributed containing holes (11), and the containing holes (11) arranged on the sample rotating disc sequentially pass through the right upper part of the weighing disc of the electronic balance (9) along with the rotation of the sample rotating disc (10); the rotary driving mechanism is arranged on one side of the electronic balance (9), and a rotary shaft (16) arranged at the output end of the rotary driving mechanism is connected with the sample rotary disc (10) and is used for driving the sample rotary disc (10) to rotate in a stepping manner according to a preset angle; The lifting isolation mechanism is an electric lifting table (13) which is arranged below the rotary driving mechanism, and the top end of the lifting isolation mechanism is connected with the lower end of the rotary driving mechanism and is used for driving the rotary driving mechanism and the sample rotary disk (10) to integrally lift; The central control and data acquisition system is respectively in communication connection with the electronic balance (9), the humidity control system, the rotary driving mechanism and the lifting isolation mechanism, and is used for controlling the rotary driving mechanism and the lifting isolation mechanism to work cooperatively, so that the full-automatic lifting-rotating-descending-weighing cycle of the multi-ground-state coal rock sample preparation device is realized, and whether the sample reaches a moisture balance state is judged through an intelligent algorithm.
2. The coal rock sample preparation device according to claim 1, wherein the humidity control system further comprises a humidity sensor, the humidity sensor is arranged at the top of the upper working chamber (3) and is used for monitoring the humidity in the constant temperature and humidity box (1) in real time, the humidity sensor is in communication connection with the central control and data acquisition system, and monitored humidity data is fed back to the central control and data acquisition system in real time; The constant humidity generating device comprises a glass dish (5) and a potassium sulfate supersaturated solution (6) contained in the glass dish (5), and is used for providing a reference humidity environment for the interior of the constant temperature and humidity box (1); The active humidifying device is a humidifier (7), the humidifier (7) is connected with the inner cavity of the constant temperature and humidity box (1) through a pipeline (8), and when the humidity in the constant temperature and humidity box (1) is lower than a set reference value, the central control and data acquisition system controls the humidifier (7) to dynamically adjust the humidity in the constant temperature and humidity box (1).
3. The coal rock sample preparation device according to claim 1, characterized in that the holding holes (11) are uniformly arranged around the rotation center of the sample rotating disc (10), the track of each holding hole (11) in the rotation motion passes through the position right above the center of the weighing disc of the electronic balance (9), and a sample dish (12) can be detachably placed in each holding hole (11); When the lifting isolation mechanism drives the sample rotating disk (10) to descend until the sample container (12) to be weighed is in contact with the weighing disk of the electronic balance (9), the sample container (12) to be weighed falls on the weighing disk of the electronic balance (9) along with the continuous descent of the lifting isolation mechanism, and meanwhile, the sample container (12) to be weighed is separated from the sample rotating disk (10).
4. The coal rock sample preparation device according to claim 1 is characterized in that a heating system is arranged in the constant temperature and humidity box (1), the heating system comprises a heating module, a circulation module and a temperature measuring module, the heating module is a heating coil arranged at the bottom of the constant temperature and humidity box (1), the heating coil is electrically connected with a central control and data acquisition system, the opening or closing of the heating coil is controlled by the central control and data acquisition system, the circulation module is a fan arranged on the inner side wall of the constant temperature and humidity box (1) and used for forcing air in the constant temperature and humidity box (1) to flow, the fan is electrically connected with the central control and data acquisition system, the opening or closing of the fan is controlled by the central control and data acquisition system, the temperature measuring module is a temperature sensor arranged at the top of an upper working chamber (3) and used for monitoring the temperature in the constant temperature and humidity box (1) in real time, the temperature sensor is in communication with the central control and data acquisition system, and the monitored temperature data is fed back to the central control and data acquisition system in real time.
5. The coal rock sample preparation device according to claim 1, wherein the rotary driving mechanism comprises a driving motor (14), a worm gear reducer (15) and a rotary shaft (16), the output end of the driving motor (14) is connected with the input end of the worm gear reducer (15), the output end of the worm gear reducer (15) is of a gear structure, the rotary shaft (16) is a gear shaft, the gear structure arranged on the rotary shaft is vertically meshed with the output end of the worm gear reducer (15), when the output end of the worm gear reducer (15) rotates, the rotary shaft (16) can be driven to rotate, and a connector for being in butt joint with a central shaft sleeve of the sample rotating disc (10) is arranged at the upper end of the rotary shaft (16).
6. The coal rock sample preparation device according to claim 1, characterized in that the central control and data acquisition system comprises an embedded controller and a touch screen (17), wherein the embedded controller runs a control program constructed based on a finite state machine model, and the control program defines the state and conversion logic of the whole workflow of the device, namely lifting-rotating-descending-weighing, so as to drive the rotation driving mechanism and the lifting isolation mechanism to work cooperatively in sequence.
7. The coal rock sample preparation device according to claim 6, wherein a touch screen (17) is installed on the top of the constant temperature and humidity box (1) for setting experimental parameters, displaying data in real time and starting and stopping a control program.
8. A method for intelligently distinguishing coal and rock samples based on the device of any one of claims 1 to 7, which is characterized by comprising the following steps: s1, setting a weighing time interval T and a balance discrimination threshold S through a central control and data acquisition system; S2, under the constant temperature and humidity environment, the central control and data acquisition system periodically and automatically controls the device to execute the cyclic weighing operation of lifting, rotating, descending and weighing, and recording the quality data W (t) of each sample at the corresponding time point t; s3, calculating the absolute difference value delta W= |W (t) -W (t-1) | of the mass in the continuous weighing period of each sample; S4, when the delta W of one sample is continuously smaller than the set balance judging threshold S for n times, the central control and data acquisition system automatically judges that the sample reaches the water balance state.
9. The method according to claim 8, wherein the weighing operation in step S2 comprises: S21, commanding the electric lifting platform (13) to lift, so that the sample dish (12) on the weighing disc of the electronic balance (9) is jointed with the sample rotating disc (10); S22, commanding the rotary driving mechanism to drive the sample rotary disk (10) to rotate by a preset angle, and placing the sample to be tested placed in the containing hole (11) above the electronic balance (9); s23, commanding the lifting isolation mechanism to descend so as to separate a sample dish (12) on a weighing disc of the electronic balance (9) from the sample rotating disc (10); s24, reading W (t) of the electronic balance (9) is read and recorded.
10. The method of claim 8, wherein n=3 in step S4.

Description

Coal rock sample preparation device and intelligent discrimination method Technical Field The invention relates to the technical field of coal rock physical property testing, in particular to a coal rock sample preparation device and an intelligent distinguishing method. Background The equilibrium moisture of coal refers to the moisture contained in coal when the moisture adsorbed in the pores of the coal and the ambient water vapor pressure reach dynamic equilibrium under specific temperature and relative humidity conditions. The equilibrium moisture is one of important indexes for evaluating the deterioration degree, oxidation degree and inherent characteristics of coal, and has important guiding significance for processing and utilizing coal, storing and transporting coal and exploring and developing coal bed gas. In the traditional coal rock equilibrium moisture sample preparation process, a manual or semi-automatic mode is usually adopted. Although the prior art realizes a certain degree of automation as disclosed in the patent with publication number CN115406731A, the device has obvious defects that firstly, the device is designed for single sample, batch processing cannot be carried out, the efficiency bottleneck is outstanding, and secondly, a weighing mechanism and a counterweight base are continuously and mechanically connected, so that vibration is difficult to thoroughly isolate, and the stability of a high-precision electronic balance is affected. The prior art still has blank in the aspects of high-flux, high-precision and full-automatic balanced water preparation. Therefore, the device which can realize multi-channel and full-automatic preparation and intelligently judge the balance state is developed and is important for improving the efficiency and reliability of coal and rock physical property research. Disclosure of Invention In view of the above, the invention aims to provide a coal rock sample preparation device and an intelligent judging method, which can realize full automation, batch and intellectualization of the preparation process of the balance moisture of the coal rock sample, automatically complete rotation, lifting and weighing of the sample, and intelligently judge whether the sample reaches the moisture balance state based on real-time data. In order to achieve the purpose, the technical scheme of the invention is realized by the following steps of: the inside of the constant temperature and humidity box is divided into an upper working chamber and a lower humidity control chamber by a partition plate; The humidity control system comprises a constant humidity generating device and an active humidifying device, wherein the constant humidity generating device is arranged in the lower humidity control chamber, and the active humidifying device is arranged outside the constant temperature and humidity box; sample processing and weighing system locates in the upper portion work room, includes: an electronic balance; the sample rotating disc is provided with a plurality of evenly distributed containing holes, and the containing holes arranged on the sample rotating disc sequentially pass through the right upper part of the electronic balance weighing disc along with the rotation of the sample rotating disc; The rotary driving mechanism is arranged on one side of the electronic balance, and a rotary shaft arranged at the output end of the rotary driving mechanism is connected with the sample rotary disc and used for driving the sample rotary disc to rotate step by step according to a preset angle; The lifting isolation mechanism is an electric lifting table which is arranged below the rotary driving mechanism, and the top end of the lifting isolation mechanism is connected with the lower end of the rotary driving mechanism and is used for driving the rotary driving mechanism and the sample rotary disk to integrally lift The central control and data acquisition system is respectively in communication connection with the electronic balance, the humidity control system, the rotary driving mechanism and the lifting isolation mechanism, and is used for controlling the rotary driving mechanism and the lifting isolation mechanism to work cooperatively, so that the full-automatic lifting-rotating-descending-weighing cycle of the coal rock sample preparation device is realized, and whether the sample reaches a moisture balance state is judged through an intelligent algorithm. Further, the humidity control system also comprises a humidity sensor, wherein the humidity sensor is arranged at the top of the upper working chamber and is used for monitoring the humidity in the constant temperature and humidity box in real time, the humidity sensor is in communication connection with the central control and data acquisition system, and monitored humidity data is fed back to the central control and data acquisition system in real time; The constant humidity generating device comprises a glass dish a