Coal mine hydraulic support oil status online monitoring and control valve anti-blocking system

Abstract

The invention discloses an online monitoring system for the hydraulic support oil state of a coal mine and an anti-blocking system for a control valve. The technical scheme thereof mainly comprises: an online monitoring system for the hydraulic support oil state of a coal mine and an anti-blocking system for a control valve, comprising a pH value micro transmitter and a particle counter for detecting the state of the hydraulic support oil of the coal mine, wherein the pH value micro transmitter and the particle counter are electrically connected to the control input end of a programmable logic controller (PLC) respectively, an alarm is electrically connected to the control output end of the programmable logic controller (PLC), the programmable logic controller is communicatively connected to a remote dispatch monitoring device, and the control input end of the programmable logic controller is electrically connected to an online measurement and control system for emulsion concentration; the invention can monitor three indicators, namely pH value, particle size and quantity, and emulsion concentration, in real time, so as to facilitate online monitoring of the state of the hydraulic support oil, facilitate abnormality processing, and reduce the possibility of control valve blockage.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, and in particular to an online monitoring system for hydraulic support oil state in coal mines and a control valve anti-blocking system. Background Art

[0002] Hydraulic support is a structure used to control the mine pressure of coal mining working face. The mine pressure of the mining face acts on the hydraulic support in the form of external load. In the mechanical system of interaction between the hydraulic support and the surrounding rock of the mining face, if the combined force of each support of the hydraulic support and the combined force of the external load acting on the hydraulic support by the roof are exactly in the same straight line, then the hydraulic support is very suitable for the surrounding rock of the mining face.

[0003] The hydraulic support is composed of hydraulic cylinders (columns, jacks), bearing structures (top beams, shield beams and bases, etc.), push devices, control systems and other auxiliary devices. The hydraulic support is one of the important equipment in the fully mechanized mining face. It is responsible for supporting the mining area, pushing the fulcrum of the scraper, and stabilizing the coal mining machine and scraper conveyor. However, due to the complex underground working environment, the hydraulic support is damaged in various ways.

[0004] The main fault phenomena caused by oil contamination are as follows:

[0005] (1) The sealing ring between the valve plates of the control valve group is damaged or misaligned, resulting in leakage, or the tie rod screw is loose, causing the seal between the valve plates to be destroyed by the high-pressure emulsion.

[0006] (2) The steel ball inside the valve core of the single-piece valve plate of the control valve group is corroded, and the high-pressure working environment causes it to have pits and wear. The wear of the nylon pad causes the groove for holding the steel ball to become larger, and the sealing ring is damaged by aging, sharp foreign objects, etc. and loses its sealing performance. The spring is corroded and loses rigidity and elasticity.

[0007] (1) Damage to the cylinder O-ring, wear of the drum seal, strain on the cylinder steel barrel, and strain on the piston rod will all lead to internal leakage in the cylinder, making it impossible to complete the column lifting action.

[0008] (2) Damage to the cylinder seal, wear of the piston rod, and wear of the cylinder barrel will cause the cylinder oil to leak out and fail to complete its supporting function.

[0009] (3) The seals of the oil inlet and outlet ports of the oil cylinder are damaged, and the one-way valve is damaged, causing the oil cylinder to fail to work normally.

[0010] In summary, oil contamination is the root cause of wear and failure of key components of coal mine hydraulic support equipment. Therefore, monitoring and timely purification and control of hydraulic medium contamination can effectively prevent and reduce equipment failures.

[0011] With the rapid development of online oil monitoring technology in recent years, it has gradually matured and improved. However, in view of the safety management requirements of coal mine equipment, there are currently no products on the market that meet the requirements for online oil monitoring systems for coal mines. Therefore, the existing coal mine hydraulic support systems are not equipped with online oil status monitoring and control valve anti-blocking systems. Oil samples are taken regularly on site and sent to the laboratory for inspection. There are unfavorable factors such as possible secondary contamination of oil samples and long inspection cycles. The three indicators of the hydraulic medium's pH value, particle size and quantity, and emulsion concentration cannot be monitored in real time. When the oil status is abnormal, it cannot be warned and purified in time, resulting in frequent control valve blockages, affecting the safe operation of the equipment. Summary of the invention

[0012] In view of the problems mentioned in the background technology, the purpose of the present invention is to provide an online monitoring system for the hydraulic support oil status in coal mines and a control valve anti-blocking system to solve the problems mentioned in the background technology.

[0013] The above technical purpose of the present invention is achieved through the following technical solutions: an online monitoring system for the hydraulic support oil state in a coal mine and a control valve anti-blocking system, comprising a pH value micro transmitter and a particle counter for detecting the state of the hydraulic support oil in a coal mine, wherein the pH value micro transmitter and the particle counter are electrically connected to the control input end of a PLC programmable controller respectively, and the control output end of the PLC programmable controller is electrically connected to an alarm, and the PLC programmable controller is communicatively connected to a remote dispatching monitoring device, and the control input end of the PLC programmable controller is electrically connected to an emulsion concentration online measurement and control system, and the control output end of the PLC programmable controller is electrically connected to an emulsion bypass purification system for cleaning the hydraulic support oil in a coal mine.

[0014] Furthermore, the alarm is an audible and visual alarm.

[0015] Furthermore, the filtration accuracy of the filter element in the emulsion bypass purification system is set to 3-5 μm.

[0016] Furthermore, the operating voltage of the pH value micro transmitter is 24V DC, and the relative humidity range is 5-95%rH.

[0017] Furthermore, the emulsion concentration online measurement and control system comprises a cleaning device, a concentration sensor and a concentration control system host, the cleaning device is connected to the concentration sensor, and the concentration sensor is communicatively connected to the concentration control system host.

[0018] Furthermore, the concentration sensor is configured as an online emulsion concentration detector.

[0019] Furthermore, the online emulsion concentration detector is inserted into the coal mine hydraulic support oil by insertion, and the number of the online emulsion concentration detector is not less than three.

[0020] Furthermore, the emulsion bypass purification system includes a coarse filtration emulsion bypass purification system and a fine filtration emulsion bypass purification system, the filtration accuracy of the filter element in the coarse filtration emulsion bypass purification system is set to 3-6μm; the filtration accuracy of the filter element in the fine filtration emulsion bypass purification system is set to 1-4μm; the coarse filtration emulsion bypass purification system is provided with a coarse filtration oil inlet pipeline; the fine filtration emulsion bypass purification system is provided with a fine filtration oil inlet pipeline, the coarse filtration oil inlet pipeline and the fine filtration oil inlet pipeline are both connected to the main oil inlet pipeline, and the coarse filtration oil inlet pipeline and the fine filtration oil inlet pipeline are respectively provided with a coarse filtration valve and a fine filtration valve; the coarse filtration valve and the fine filtration valve are electrically connected to the control output end of the PLC programmable controller.

[0021] In summary, the present invention mainly has the following beneficial effects:

[0022] First, the present invention can monitor the three indicators of pH value, particle size and quantity, and emulsion concentration in real time by setting a pH value micro transmitter, a particle counter, and an emulsion concentration online measurement and control system, thereby facilitating real-time online monitoring of the hydraulic support oil state, facilitating timely processing of abnormalities, and reducing the possibility of control valve blockage;

[0023] Second, by setting up an emulsion bypass purification system, the present invention can start the hydraulic medium purification device in a timely or regular manner according to the system pollution monitoring data results, control the amount of oil pollutants from the hydraulic medium source of the equipment, ensure the safe and normal operation of the production equipment, and at the same time reduce the workload and maintenance frequency of the online filter of the hydraulic support system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural block diagram of the present invention;

[0025] Figure 2 This is the working principle diagram of pH value detection;

[0026] Figure 3 This is a working principle diagram of particle detection.

[0027] Figure numerals: 1. Remote dispatch monitoring equipment; 2. PLC programmable controller; 3. pH value micro transmitter; 4. Particle counter; 5. Emulsion concentration online measurement and control system; 6. Emulsion bypass purification system; 7. Alarm. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] refer to Figures 1 to 3 , a coal mine hydraulic support oil state online monitoring and control valve anti-blocking system, including a pH value micro transmitter 3 and a particle counter 4 for detecting the state of the coal mine hydraulic support oil, the pH value micro transmitter 3 and the particle counter 4 are electrically connected to the control input end of the PLC programmable controller 2 respectively, the control output end of the PLC programmable controller 2 is electrically connected to an alarm 7, the PLC programmable controller 2 is communicatively connected to a remote scheduling monitoring device 1, the control input end of the PLC programmable controller 2 is electrically connected to an emulsion concentration online measurement and control system 5, and the control output end of the PLC programmable controller 2 is electrically connected to an emulsion bypass purification system 6 for cleaning the coal mine hydraulic support oil.

[0031] refer to Figure 1 In order to improve the alarm effect, the alarm 7 is an audible and visual alarm.

[0032] refer to Figure 1 In order to increase the filtering effect, the filtering accuracy of the filter element in the emulsion bypass purification system 6 is set to 1-6μm.

[0033] refer to Figure 1 , in order to facilitate working under suitable humidity; the working voltage of the pH value micro transmitter 3 is 24V DC, and the relative humidity range is 5-95%rH.

[0034] refer to Figure 1 , in order to facilitate the concentration monitoring; the emulsion concentration online measurement control system 5 includes a cleaning device, a concentration sensor and a concentration control system host, the cleaning device is connected to the concentration sensor, the concentration sensor and the concentration control system host communication connection.

[0035] refer to Figure 1 , in order to increase the concentration monitoring effect; the concentration sensor is set as an online emulsion concentration detector.

[0036] refer to Figure 1 In order to improve the accuracy of detection, the online emulsion concentration detector is inserted into the coal mine hydraulic support oil by insertion, and the number of online emulsion concentration detectors is not less than three.

[0037] refer to Figure 1 , the emulsion bypass purification system 6 includes a coarse filtration emulsion bypass purification system and a fine filtration emulsion bypass purification system, the filter element filtration accuracy of the coarse filtration emulsion bypass purification system is set to 3-6μm; the filter element filtration accuracy of the fine filtration emulsion bypass purification system is set to 1-4μm; the coarse filtration emulsion bypass purification system is provided with a coarse filtration oil inlet pipeline; the fine filtration emulsion bypass purification system is provided with a fine filtration oil inlet pipeline, the coarse filtration oil inlet pipeline and the fine filtration oil inlet pipeline are both connected to the main oil inlet pipeline, and the coarse filtration oil inlet pipeline and the fine filtration oil inlet pipeline are respectively provided with a coarse filtration valve and a fine filtration valve; the coarse filtration valve and the fine filtration valve are electrically connected to the control output end of the PLC programmable controller 2; the coarse filtration valve and the fine filtration valve are both high-pressure small solenoid valves of model JG20A8 of Shanghai King Kong Valve Company;

[0038] It is difficult to install and maintain the filtering equipment underground. In order to extend the service life of the emulsion bypass purification system, a coarse filtration emulsion bypass purification system and a fine filtration emulsion bypass purification system are designed. When the oil is slightly contaminated, the purification purpose can be achieved by filtering through the coarse filtration emulsion bypass purification system, while the fine filtration emulsion bypass purification system is in standby mode; when the oil mist is seriously contaminated, the purification purpose can be achieved by filtering through the fine filtration emulsion bypass purification system, while the coarse filtration emulsion bypass purification system is in standby mode. The two systems can be replaced under different working conditions, which can extend the service life of the overall emulsion bypass purification system and reduce the number of filter element replacements. Specifically, the pollution threshold can be set to a for the maximum value of low pollution and b for high pollution. The detection value is between 0-ab-infinity. When the detection data is greater than a and less than b, the coarse filter valve is opened and the fine filter valve is closed; when the detection data is greater than b, the coarse filter valve is closed and the fine filter valve is opened. No matter which system the oil is purified from, it will eventually flow back to the lubrication system through the pipeline.

[0039] In the present invention, the pH value micro transmitter 3 adopts the M80 micro transmitter of Mettler-Toledo International Co., Ltd.; the particle counter 4 adopts the particle counter PC3400 of Shanghai Hansen Scientific Instrument Co., Ltd. With this selection, it is necessary to determine the cleanliness level output and display the number of particles of different particle sizes detected on the PLC programmable controller 2 according to NAS1638 or ISO4406 standards to meet the customer's reading and identification requirements; the emulsion concentration online measurement and control system 5 adopts the emulsion concentration online measurement and control system of Beijing Boruis Optoelectronic Technology Co., Ltd., and the online emulsion concentration detector adopts the T-BD5-EMC1204-HT60 plug-in emulsion concentration meter of Beidouxing Industrial Chemistry Research Institute in Haidian District, Beijing.

[0040] Principle and advantages of use:

[0041] The present invention uses a PLC programmable controller 2 on site to collect all three monitoring sensor signals such as pH value, particle size and quantity, and emulsion concentration. After data processing, it can realize real-time monitoring of the hydraulic support oil state and on-site alarm for over-limit; and automatically start the oil pollution purification system in time to remove pollutants in the oil according to the monitoring data results; at the same time, the monitoring system data can also be uploaded to the remote dispatch monitoring device 1 by communication mode for monitoring by the enterprise central control dispatch room;

[0042] The present invention can monitor the three indicators of pH value, particle size and quantity, and emulsion concentration in real time by arranging a pH value micro transmitter 3, a particle counter 4, and an emulsion concentration online measurement and control system 5, thereby facilitating online monitoring of the hydraulic support oil state, facilitating abnormal processing, and reducing the possibility of control valve blockage; by arranging an emulsion bypass purification system 6, it is possible to start purifying the hydraulic medium in a timely or regular manner based on the system pollution monitoring data results, control the amount of oil pollutants from the hydraulic medium source of the equipment, ensure the safe and normal operation of the production equipment, and at the same time reduce the workload and maintenance frequency of the online filter of the hydraulic support system.

[0043] Example 2

[0044] refer to Figures 1 to 3 The online monitoring system for the hydraulic support oil state of coal mines and the control valve anti-blocking system are designed in accordance with the current safety standards for underground equipment in coal mines, and include a pH value micro transmitter 3 and a particle counter 4 for detecting the pollution state of the hydraulic support oil of coal mines. The pH value micro transmitter 3 monitors the pH value change of the oil in real time. Too high or too low pH value will cause microbial growth and contamination of the oil and equipment corrosion. The particle counter 4 monitors the size and number of particles in the oil in real time. The increase in the number of particles will cause the valve to be blocked and stuck and aggravate the wear of parts. The pH value micro transmitter 3 and the particle counter 4 are electrically connected to the control input end of the PLC programmable controller 2 respectively, and the control output end of the PLC programmable controller 2 is electrically connected to an alarm 7. The PLC programmable controller 2 is connected to a remote dispatch monitoring device 1 in communication. The control input end of the PLC programmable controller 2 is electrically connected to an emulsion concentration online measurement control system 5, and the control output end of the PLC programmable controller 2 is electrically connected to an emulsion bypass purification system 6 for cleaning the hydraulic support oil of coal mines.

[0045] refer to Figures 1 to 3, where the pH value micro transmitter 3 is mainly composed of a reference electrode, a glass electrode and an ammeter. The basic function of the reference electrode is to maintain a constant potential as a reference for measuring various deviations from the potential. Silver-silver oxide electrode is currently a commonly used reference electrode in pH. The function of the glass electrode is to establish a potential difference that responds to changes in the activity of hydrogen ions in the measured solution. Placing the pH-sensitive electrode and the reference electrode in the same solution forms a primary cell, the potential of which is the algebraic sum of the potentials of the glass electrode and the reference electrode. E battery = E reference + E glass. If the temperature is constant, the potential of this cell changes with the pH of the solution to be measured, and it is difficult to measure the potential generated by the battery in the pH meter because its electromotive force is very small and the impedance of the circuit is very large 1-100MΩ; therefore, the signal must be amplified to be sufficient to drive a standard millivoltmeter or milliammeter. The function of an ammeter or transmitter is to amplify the potential of the primary battery several times. The amplified signal is displayed by the meter. The degree of deflection of the meter pointer indicates the strength of the signal it pushes. For the needs of use, the dial of the pH ammeter is engraved with the corresponding pH value; while the digital pH meter directly displays the pH value in numbers.

[0046] The particle counter 4 is mainly composed of a light source, a detector, a photoelectric receiver and a photoelectric converter. The light emitted from the light source passes through a collimator and is gathered into a very uniform and parallel light beam, which is emitted to the photodiode through the window of the sensing area. The sensing area is made of transparent optical material, and the measured oil passes through it in a vertical direction. When it flows through the window, it is illuminated by the uniform parallel light beam from the light source. The photodiode converts the received light into an electrical signal and transmits it to the counter through a preamplifier. Since the amount of light blocked is proportional to the projected area of ​​the particle, the amplitude of the output voltage pulse directly reflects the size of the particle. The pulse voltage signal output by the sensor is transmitted to the analog comparator of the counter and compared with the preset threshold voltage. When the pulse voltage amplitude is greater than the threshold voltage, the counter counts, and the number of particles can be obtained by accumulating the number of pulses.

[0047] By setting up a pH value micro transmitter 3, a particle counter 4, and an emulsion concentration online measurement and control system 5, the three indicators of pH value, particle size and quantity, and emulsion concentration can be monitored in real time, thereby facilitating online monitoring of the hydraulic support oil state, facilitating abnormal processing, and reducing the possibility of control valve blockage; by setting up an emulsion bypass purification system 6, it is possible to start purifying the hydraulic medium in a timely or regular manner based on the system pollution monitoring data results, control the amount of oil pollutants from the hydraulic medium source of the equipment, ensure the safe and normal operation of the production equipment, and at the same time reduce the workload and maintenance frequency of the online filter of the hydraulic support system.

[0048] refer to Figures 1 to 3, wherein the alarm 7 is an audible and visual alarm. When the alarm 7 adopts an audible and visual alarm, the alarm effect is good; wherein the filtration accuracy of the filter element in the emulsion bypass purification system 6 is set to 1-6μm, which can increase the filtration effect.

[0049] refer to Figures 1 to 3 , wherein the working voltage of the pH value micro transmitter 3 is 24V DC, and the relative humidity range is 5-95%rH. This setting can facilitate working under appropriate humidity.

[0050] refer to Figures 1 to 3 The emulsion concentration online measurement and control system 5 includes a cleaning device, a concentration sensor and a concentration control system host. The cleaning device is connected to the concentration sensor, and the concentration sensor is communicatively connected to the concentration control system host. This setting can facilitate concentration monitoring; wherein the concentration sensor is set as an online emulsion concentration detector, and this setting can increase the concentration monitoring effect.

[0051] refer to Figures 1 to 3 The online emulsion concentration detector is inserted into the coal mine hydraulic support oil by insertion. The number of online emulsion concentration detectors is not less than three. The use of multiple online emulsion concentration detectors can achieve a comprehensive detection effect.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The coal mine hydraulic support oil state online monitoring and control valve anti-blocking system is characterized by: The invention comprises a pH value micro transmitter (3) and a particle counter (4) for detecting the state of coal mine hydraulic support oil, wherein the pH value micro transmitter (3) and the particle counter (4) are respectively electrically connected to the control input end of a PLC programmable controller (2), the control output end of the PLC programmable controller (2) is electrically connected to an alarm (7), the PLC programmable controller (2) is communicatively connected to a remote dispatch monitoring device (1), the control input end of the PLC programmable controller (2) is electrically connected to an emulsion concentration online measurement control system (5), and the control output end of the PLC programmable controller (2) is electrically connected to an emulsion bypass purification system (6) for cleaning coal mine hydraulic support oil; The alarm (7) is an audible and visual alarm; The filter element in the emulsion bypass purification system (6) has a filtration accuracy of 1-6 μm; The working voltage of the pH value micro transmitter (3) is 24V DC, and the relative humidity range is 5-95%rH; The emulsion concentration online measurement and control system (5) comprises a cleaning device, a concentration sensor and a concentration control system host, wherein the cleaning device is connected to the concentration sensor, and the concentration sensor is communicatively connected to the concentration control system host; The concentration sensor is configured as an online emulsion concentration detector; The online emulsion concentration detector is inserted into the coal mine hydraulic support oil by inserting, and the number of the online emulsion concentration detector is not less than three; The emulsion bypass purification system (6) comprises a coarse filtration emulsion bypass purification system and a fine filtration emulsion bypass purification system, wherein the filter element in the coarse filtration emulsion bypass purification system has a filtration accuracy of 3-6 μm; the filter element in the fine filtration emulsion bypass purification system has a filtration accuracy of 1-4 μm; the coarse filtration emulsion bypass purification system is provided with a coarse filtration oil inlet pipeline; the fine filtration emulsion bypass purification system is provided with a fine filtration oil inlet pipeline, the coarse filtration oil inlet pipeline and the fine filtration oil inlet pipeline are both connected to the main oil inlet pipeline, and the coarse filtration oil inlet pipeline and the fine filtration oil inlet pipeline are respectively provided with a coarse filtration valve and a fine filtration valve; the coarse filtration valve and the fine filtration valve are electrically connected to the control output end of the PLC programmable controller (2).

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