CN115180432A

CN115180432A - Fault monitoring system for ore tank dust removal, dust removal system and variable frequency control method of dust removal system

Info

Publication number: CN115180432A
Application number: CN202210777235.6A
Authority: CN
Inventors: 李小川; 周福宝; 张明瑞; 何新建; 杨轩; 彭泽银
Original assignee: Jiangsu Shian Health Science And Technology Research Institute Co ltd; China University of Mining and Technology CUMT
Current assignee: Jiangsu Shian Health Science And Technology Research Institute Co ltd; China University of Mining and Technology CUMT
Priority date: 2022-07-02
Filing date: 2022-07-02
Publication date: 2022-10-14
Anticipated expiration: 2042-07-02
Also published as: CN115180432B

Abstract

The invention discloses a fault monitoring system for ore tank dust removal, an ore tank discharging and dust removing system and a variable frequency control method of the ore tank discharging and dust removing system, wherein a fault monitoring and controlling device comprises a dust removing channel, and the dust removing channel defines a closed ventilation groove; a dust removing vehicle configured to be communicable with the ventilation slot during movement; a dust remover; the pressure sensors can detect the pressure at the positions of the ventilation grooves; the distance measuring device is arranged on the dust removing vehicle to measure the distance between the dust removing vehicle and the dust remover; a control component, a preset dust removal pressure P is prestored in the control component _{Preset of} And the frequency conversion device is respectively connected with the control component and the dust remover so as to dynamically control the working frequency of the dust remover according to the control signal of the control component. The fault monitoring and controlling device provided by the embodiment of the invention has the advantages that the fault monitoring result is reliable, the positioning is accurate, and meanwhile, the intelligence is realizedAnd (5) real-time regulation and control.

Description

Fault monitoring system for ore tank dust removal, dust removal system and variable frequency control method of dust removal system

Technical Field

The invention relates to the technical field of dust control of production workshops, in particular to a fault monitoring system for ore tank dust removal, an ore tank discharging dust removal system and a variable frequency control method of the ore tank discharging dust removal system.

Background

The ore tank discharging workshop is widely used in steel plants and is used for the production links of continuous discharging, leveling and the like of a plurality of ore bins. Due to the reasons of large dust content of sinter, large fall of materials, continuous operation and the like, the dust removal pressure of a workshop is huge.

In the prior art, a dust hood is usually arranged on a discharge trolley, and then a dust-containing air flow is conveyed to a dust remover through a dust removing vehicle and a ventilation groove for dust removing treatment, such as ZL201821339696.0, and a mode that the dust remover synchronously runs along with the discharge trolley is adopted in some schemes, such as ZL200620076303.2, ZL201310127255.X and ZL201410303004.7, but the whole system is complex, high in failure rate and relatively few in application.

Moreover in above-mentioned scheme, the ventilation groove is mostly open structure, and the top covers the belt and seals, and the ventilation dust removal car sets up the rubber roll and can open the belt everywhere and realize dusty air current and transport in succession, nevertheless has following problem in practical application in-process usually: firstly, effective monitoring and control means, fault alarming and positioning schemes are lacked, unified regulation and control cannot be achieved in time, and once faults such as belt deviation and the like occur in the ventilation grooves, the faults are difficult to position, and the maintenance progress is slow; secondly, even if the partial scheme adopts a video sensing visual identification technology for monitoring, the identification effect is poor due to a high dust concentration environment, image processing and identification failure are easily caused by dust deposition, and the number of cameras required by a machine visual technology is large due to a long ventilation slot, so that the camera is high in price and inconvenient to install and use; thirdly, besides poor monitoring effectiveness, the practical dust removal working frequency is lack of regulation and control in the operation process of the dust removal vehicle, and the dust remover usually runs at full load, so that the problems of high energy consumption, easy equipment loss, short service life and the like are caused.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, one object of the invention is to provide a fault monitoring system for mine pit dust removal, which has a simple structure, is easy to install and use, has reliable fault monitoring results and accurate positioning, and simultaneously realizes intelligent real-time regulation and control of actual ventilation demand, thereby effectively removing dust and avoiding ventilation waste.

The invention also provides a system for discharging and dedusting by adopting the ore tank, which adopts the fault monitoring system for dedusting by adopting the ore tank.

The invention also provides a frequency conversion control method of the fault monitoring system adopting the ore tank for dust removal.

The fault monitoring system for ore bin dust removal comprises a dust removal channel, wherein the dust removal channel is arranged adjacent to an ore bin and defines a closed ventilation slot, and is provided with a dust removal rail; the dust removing vehicle is movably arranged on the dust removing track and is provided with a dust inlet and a dust outlet, and the dust outlet can be communicated with the ventilation groove in the moving process; the dust remover is arranged at one end of the dust removing channel and is communicated with the ventilation groove so as to remove dust in the ventilation groove; the pressure sensors are arranged at intervals along the extending direction of the ventilation groove, and each pressure sensor can detect the pressure at the position of the ventilation groove; the distance measuring device is arranged on the dust removing vehicle to measure the distance between the dust removing vehicle and the dust remover; a control assembly within whichPrestoring reference pressure and preset dust removal pressure P _{Preset of} The control assembly is respectively connected with the plurality of pressure sensors, the distance measuring device and the dust remover and compares the detection pressure of the pressure sensors, the distance signal of the distance measuring device and the reference pressure to carry out fault monitoring, and the frequency conversion device is respectively connected with the control assembly and the dust remover to dynamically control the working frequency of the dust remover according to the control signal of the control assembly.

According to the fault monitoring system for ore pit dust removal provided by the embodiment of the invention, the plurality of pressure sensors are arranged at intervals in the extending direction of the ventilation groove, the reference pressure at different positions in the ventilation groove is preset in the control assembly, and the control assembly is connected with the plurality of pressure sensors and the distance measuring device, so that the fault monitoring is carried out on the states in the ventilation groove at different working conditions and different positions according to the detected pressure, distance signals and the like _{Preset of} Compared with the prior art, the method has the advantages that the negative pressure suction force in the ventilating slot section where the dust removing vehicle is located can be ensured, the situation that the negative pressure suction force in the slot section where the dust removing vehicle is located is far greater than the negative pressure suction force required by dust removal, so that the great ventilation waste is caused, the dynamic adjustment of the working frequency of the dust remover is realized in the operation process of the dust removing vehicle, the energy conservation and the consumption reduction are realized, and the service life of parts is prolonged.

According to some embodiments of the invention, the reference pressure comprises a first reference pressure, and the first reference pressure satisfies: p = a ₁ L ² +a ₂ L+a ₃ Wherein a is ₁ ＝-0.1～-0.08，a ₂ ＝14.5～15.5，a ₃ = -1000 to 0,P is the reference pressure of any position pressure sensor in the ventilation groove, L is the distance between the any position pressure sensor and the dust remover, and a ₁ 、a ₂ 、a ₃ The pressure sensors are obtained by calculating the detection pressure of any three pressure sensors and the corresponding distance value L.

According to some examples of the invention, when the fluctuation of the detected pressure at any position in the ventilation groove is less than 50Pa, the control assembly prompts the ore groove unloading and dust removing system to normally operate; when the fluctuation of the detection pressure at any position in the ventilation groove is larger than 50Pa, the detection pressure at the position is compared with the first reference pressure at the position, and when the detection pressure at the position is larger than the first reference pressure at the position, the control component prompts the position of the ventilation groove to leak air.

According to some embodiments of the invention, the reference pressure comprises a second reference pressure, and the second reference pressure satisfies:

P1＝a ₁ L ₁ ² +a ₂ L ₁ +a ₃ wherein a is ₁ ＝-0.1～-0.08，a ₂ ＝14.5～15.5，a ₃ ＝-1000～0；

P2＝k ₁ L ₂ +b ₁ Wherein k is ₁ ＝-20～-15，b ₁ ＝-45～-40；

P3＝k ₂ L ₃ +b ₂ Wherein k is ₂ ＝240～255，b ₂ ＝-9200～-8900；

P4＝k ₃ L4+b ₃ Wherein k is ₃ ＝0.95～1.15，b ₃ ＝-400～-350；

Wherein, P1 is the reference pressure in the groove section at one side of the ventilation groove back to the dust removing vehicle, L1 is the distance between any position pressure sensor in the groove section at one side of the ventilation groove back to the dust removing vehicle and the dust remover, a ₁ 、a ₂ 、a ₃ Through the calculation of the detection pressure of the pressure sensor and the corresponding distance value in the groove section on one side of the dust removing vehicle, which is back to the ventilating groove, P2 and P3 are reference pressures in the groove section at the position where the dust removing vehicle is located and the ventilating groove is adjacent to the pressure sensor at any position in the groove section at the position where the dust removing vehicle is located, and L2 and L3 are reference pressures in the groove section at the position where the ventilating groove is adjacent to the dust removing vehicleDistance of the device from the dust catcher, k ₁ 、b ₁ 、k ₂ 、b ₂ The detection pressure of the pressure sensor in the groove section of the position where the dust removing vehicle is located is obtained through calculation of the corresponding distance value of the pressure sensor, P4 is reference pressure between the dust removing vehicle and the dust remover in the groove section of the ventilation groove, L4 is the distance between the dust removing vehicle and the dust remover from the pressure sensor at any position in the groove section of the ventilation groove, and k is the distance between the dust removing vehicle and the dust remover ₃ 、b ₃ And the pressure sensor is used for detecting the pressure of the air duct between the dust removing vehicle and the dust remover.

According to some examples of the invention, when the fluctuation of the detected pressure at any position in the ventilation groove is less than 50Pa, the control assembly prompts the ore groove unloading and dust removing system to normally operate; when the fluctuation of the detection pressure of any position in the groove section of one side of the ventilation groove, which is back to the dust removal vehicle, is greater than 50Pa, comparing the detection pressure of the position with the second reference pressure of the position, and when the detection pressure of the position is greater than the second reference pressure of the position, prompting the position of the ventilation groove to leak air by the control assembly; when the fluctuation of the detection pressure at any position in the groove section of the ventilation groove between the dust removing vehicle and the dust remover is larger than 50Pa, the detection pressure at the position is compared with the second reference pressure at the position, and when the detection pressure at the position is larger than the second reference pressure at the position, the control component prompts the air leakage at the position of the ventilation groove.

According to some examples of the invention, the reference pressure in the section of the ventilation slot adjacent to the location of the dust removal vehicle is in a decreasing and increasing trend.

According to some examples of the invention, a trend of a reference pressure change in a groove section of the ventilation groove adjacent to a position where the dust removal vehicle is located is substantially in a shape of a "√".

According to some embodiments of the invention, the fault monitoring system for mine groove dust removal further comprises a frequency conversion device, wherein the frequency conversion device is respectively connected with the control component and the dust remover so as to dynamically control the working frequency of the dust remover according to the control signal of the control component.

According to some embodiments of the invention, when the detected pressure in the section of the ventilation slot adjacent to the location of the dust removal vehicle is greater than a preset dust removal pressure P _{Preset of} When the dust remover works, the control component controls the frequency conversion device to increase the working frequency of the dust remover; when the detection pressure in the groove section of the ventilation groove adjacent to the position of the dust removing vehicle is less than the preset dust removing pressure P _{Preset of} When the dust remover works, the control component controls the frequency conversion device to reduce the working frequency of the dust remover, wherein the preset dust removing pressure P _{Preset of} Satisfies the following conditions: -350 Pa.ltoreq.P _{Preset of} ≤-650Pa。

According to the ore tank unloading and dust removing system of the embodiment of the second aspect of the invention, the fault monitoring system for ore tank dust removal of the embodiment of the first aspect of the invention is adopted.

According to the ore tank discharging dust removal system provided by the embodiment of the invention, the fault monitoring system for ore tank dust removal provided by the embodiment of the first aspect of the invention has the characteristics of reliable fault monitoring result, accurate positioning, high stability, realization of intelligent real-time regulation and control of actual ventilation demand, effective dust removal, avoidance of ventilation waste and the like.

According to the frequency conversion control method of the ore tank discharging and dust removing system in the third aspect of the invention, the ore tank dust removing system adopts the fault monitoring system for ore tank dust removal in the first aspect of the invention, and the frequency conversion control method comprises the following steps: s1, measuring the distance between a dust removal vehicle and a dust remover, and determining the position of a ventilation groove where the dust removal vehicle is located; s2, detecting the detection pressure of the dust removing vehicle at the position of the ventilation groove; s3, comparing the detection pressure in the step S2 with a preset dust removal pressure P _{Preset of} Comparing, wherein-350 Pa is less than or equal to P _{Preset of} Less than or equal to-650 Pa; s4, when the detection pressure is less than the preset dust removal pressure P _{Preset of} When the working frequency of the dust remover is reduced, the detection pressure is greater than the preset dust removing pressure P _{Preset of} And increasing the working frequency of the dust remover.

According to the variable frequency control method of the ore bin discharging and dust removing system, the reference pressure of different positions in the ventilation bin is prestored, the pressure detection is carried out on the different positions, the detection pressure under different working conditions is compared with the reference pressure, and therefore fault monitoring is carried out on the states in the ventilation bin under different working conditions and different positions _{Preset of} Compared with the prior art, the negative pressure suction force in the groove section of the ventilation groove where the dust removing vehicle is located can be ensured, the situation that the negative pressure suction force in the groove section where the dust removing vehicle is located is far larger than the negative pressure suction force required by dust removal, so that great ventilation waste is caused can be avoided, the dynamic adjustment of the working frequency of the dust remover is realized in the operation process of the dust removing vehicle, the energy conservation and the consumption reduction are achieved, and the service life of parts is prolonged.

According to some embodiments of the invention, the preset dust removal pressure P _{Preset of} Satisfies the following conditions: -450 Pa.ltoreq.P _{Preset of} ≤-550Pa。

According to some embodiments of the invention, before the step S1, the following step is further included:

s11, whether the ventilation groove leaks air or not is detected, and when the ventilation groove is detected to leak air from any position, the ventilation groove is prompted to have a leakage fault at the position in the ventilation groove.

According to some embodiments of the invention, said step S11 comprises: s111, pre-storing reference pressures at different positions in the ventilation groove, wherein the reference pressures comprise a first reference pressure under the operation condition of a non-dust-removing vehicle and a second reference pressure under the operation condition of a dust-removing vehicle; s112, detecting the detection pressure at the position where the pressure sensors are located respectively by the plurality of pressure sensors; s113, comparing the detected pressure of step S112 with the reference pressure at the corresponding position prestored in step S111; and S114, when the detected pressure at any position in the ventilation groove in the step S112 is greater than the reference pressure at the corresponding position in the ventilation groove prestored in the step S111, prompting that the air leakage fault occurs at the position in the ventilation groove.

According to some embodiments of the invention, the first reference pressure satisfies: p = a ₁ L ² +a ₂ L+a ₃ Wherein a is ₁ ＝-0.1～-0.08，a ₂ ＝14.5～15.5，a ₃ = -1000-0,P is the reference pressure of the pressure sensor at any position in the ventilation groove, L is the distance between the pressure sensor at any position and the dust remover, and a ₁ 、a ₂ 、a ₃ The pressure sensors are obtained by calculating the detection pressure of any three pressure sensors and the corresponding distance value L.

According to some embodiments of the invention, the step S113 comprises: when the fluctuation of the detection pressure at any position in the ventilation slot is smaller than 50Pa, prompting the ore slot unloading and dust removing system to normally operate; when the fluctuation of the detection pressure at any position in the ventilation groove is larger than 50Pa, comparing the detection pressure at the position with the first reference pressure at the position prestored in the step S112, and when the detection pressure at the position is larger than the first reference pressure at the position, prompting that air leakage exists at the position of the ventilation groove.

According to some embodiments of the invention, the second reference pressure satisfies:

P2＝k ₁ L ₂ +b ₁ Wherein k is ₁ ＝-20～-15，b ₁ ＝-45～-40；

P4＝k ₃ L4+b ₃ Wherein k is ₃ ＝0.95～1.15，b ₃ ＝-400～-350；

Wherein P1 is the reference pressure in the groove section at one side of the ventilation groove back to the dust removal vehicle, and L1 is the ventilationThe distance a from the pressure sensor to the dust remover at any position in the groove section on one side of the groove back to the dust removing vehicle ₁ 、a ₂ 、a ₃ Through the back of ventilation groove in the tank section of one side of dust removal car the detection pressure of pressure sensor and its corresponding distance value calculation obtain, P2, P3 are that ventilation groove is close to the reference pressure in the tank section of dust removal car position, L2, L3 are that ventilation groove is close to arbitrary position in the tank section of dust removal car position the pressure sensor apart from the distance of dust remover, k ₁ 、b ₁ 、k ₂ 、b ₂ The detection pressure of the pressure sensor in the groove section of the position where the dust removing vehicle is located is obtained through calculation of the corresponding distance value of the pressure sensor, P4 is reference pressure between the dust removing vehicle and the dust remover in the groove section of the ventilation groove, L4 is the distance between the pressure sensor and the dust remover in any position between the dust removing vehicle and the dust remover in the groove section of the ventilation groove, and k is the distance between the pressure sensor and the dust remover ₃ 、b ₃ And the pressure sensor is used for detecting the pressure of the air duct between the dust removing vehicle and the dust remover.

According to some embodiments of the invention, the step S113 comprises: when the fluctuation of the detection pressure at any position in the ventilation groove is less than 50Pa, prompting the normal operation of the ore groove discharging and dust removing system; when the fluctuation of the detection pressure at any position in the ventilation groove is larger than 50Pa, comparing the detection pressure at the position with the second reference pressure prestored in the step S112, and when the detection pressure at the position is larger than the second reference pressure at the position, prompting that air leaks from the position of the ventilation groove.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a fault monitoring system for mine pit dusting according to an embodiment of the present invention;

FIG. 2 is a pressure distance curve of a fault monitoring system for mine groove dust removal at different working frequencies of a dust remover under the operating condition of a non-dust removing vehicle according to an embodiment of the invention;

FIG. 3 is a pressure distance curve of a fault monitoring system for ore tank dust removal under the operating condition of a non-dust removal vehicle under the G point leakage fault according to an embodiment of the invention;

fig. 4 is a pressure distance curve of a fault monitoring system for mine groove dedusting under the operation condition of a dedusting vehicle according to the embodiment of the invention.

Reference numerals are as follows: 0-1: a ventilation slot; 0-2: a dust removal vehicle; 0-3: a dust remover; 1-1: a pressure sensor; 1-2: an in-place switch; 1-3: a distance measuring device; 1-4: a frequency conversion device; 1-5: a PLC controller; 1-6: computer with a display

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A fault monitoring system for the dusting of mine chutes according to an embodiment of the first aspect of the invention is described below.

As shown in fig. 1-4, the fault monitoring system for ore groove dust removal according to the embodiment of the invention comprises a dust removal channel, a dust removal vehicle 0-2, a dust remover 0-3, a plurality of pressure sensors 1-1, a distance measuring device 1-3 and a control assembly.

The dust removal channel is arranged adjacent to the ore tank, a closed ventilation groove 0-1 is defined in the dust removal channel, the dust removal channel is provided with a dust removal track, for example, the dust removal track can be directly formed on the top wall of the dust removal channel and can also be formed on the side wall of the dust removal channel, the dust removal vehicle 0-2 is movably arranged on the dust removal track, the dust removal vehicle 0-2 is provided with a dust inlet for dust-containing air flow to enter and a dust outlet for dust-containing air flow to transfer, and the dust outlet of the dust removal vehicle 0-2 is communicated with the ventilation groove 0-1 in the process of moving along the dust removal track, so that the dust-containing air flow entering from the dust inlet of the dust removal vehicle 0-2 can flow into the ventilation groove 0-1 and then enter the next dust removal treatment.

Furthermore, a dust remover 0-3 is arranged at one end of the dust removing channel, the dust remover 0-3 is communicated with the ventilation groove 0-1 so as to remove dust of the entering dust-containing air flow in the ventilation groove 0-1, a plurality of pressure sensors 1-1 are arranged at intervals along the extension direction of the ventilation groove 0-1, each pressure sensor 1-1 can detect the pressure at the position of the ventilation groove 0-1 where the detector is positioned, a distance measuring device 1-3 is arranged on the dust removing vehicle 0-2 and used for measuring the distance between the dust removing vehicle 0-2 and the dust remover 0-3, and reference pressures under different working conditions and preset dust removing pressure P are prestored in the control assembly _{Preset of} The control assembly is respectively connected with the pressure sensor 1-1, the distance measuring device 1-3 and the dust remover 0-3, receives detection pressure of the pressure sensor 1-1 and distance signals of the distance measuring device 1-3, compares the detection pressure with reference pressure under different working conditions, such as 0-2 working condition of a non-dust-removing vehicle, compares detection pressure of each position in the ventilation groove 0-1 when the non-dust-removing vehicle is 0-2 with reference pressure at a corresponding position, or has 0-2 working condition of the dust-removing vehicle, and compares detection pressure of each position in the ventilation groove 0-1 in the running process of the dust-removing vehicle 0-2 with reference pressure at the corresponding position; the frequency conversion devices 1-4 are respectively connected with the control component and the dust collectors 0-3, and dynamically control the working frequency of the dust collectors 0-3 according to the control signal of the control component.

Therefore, according to the mine pit dust removal fault monitoring system provided by the embodiment of the invention, the pressure sensors 1-1 are arranged at intervals in the extending direction of the ventilation groove 0-1, the reference pressure at different positions in the ventilation groove 0-1 is preset in the control assembly, and the control assembly is connected with the pressure sensors 1-1 and the distance measuring device 1-3, so that the fault monitoring is carried out on the states in the ventilation groove 0-1 under different working conditions and at different positions according to the detected pressure, distance signals and the likeThe dust removing vehicle is easy to install and maintain, and the pressure sensor 1-1 is used for detecting the detection pressure at the position of the ventilation groove 0-1 where the dust removing vehicle 0-2 is positioned and the preset dust removing pressure P _{Preset of} Compared with the prior art, the negative pressure suction force in the section of the ventilating slot 0-1 where the dust removing vehicle 0-2 is located can be ensured, the situation that the negative pressure suction force in the section of the ventilating slot 0-2 where the dust removing vehicle 0-2 is located is far larger than the negative pressure suction force required by dust removal, so that great ventilation waste is caused can be avoided, the dynamic adjustment of the working frequency of the dust remover 0-3 is realized in the running process of the dust removing vehicle 0-2, the purposes of saving energy and reducing consumption and prolonging the service life of components are achieved.

Referring to fig. 1, in some embodiments of the present invention, the reference pressure includes a first reference pressure at each position in the ventilation slot 0-1 under the operation condition of the dust-free vehicle 0-2, and the first reference pressure satisfies that P = a ₁ L ² +a ₂ L+a ₃ Wherein a is ₁ ＝-0.1～-0.08，a ₂ ＝14.5～15.5，a ₃ = -1000 to 0,P is the reference pressure of the pressure sensor 1-1 at any position in the ventilation groove 0-1, L is the distance between the pressure sensor 1-1 at any position and the dust remover 0-3, and a ₁ 、a ₂ 、a ₃ The pressure values are obtained by calculating the detected pressure of any three pressure sensors 1-1 and the corresponding distance values L.

For example, confirm a ₁ 、a ₂ 、a ₃ The working frequency of each gradient of the dust remover 0-3 can be fixed, then the corresponding values of the pressure and the distance of any three points are detected and substituted into the formula for calculation, and as shown in figure 2, when the dust remover 0-3 runs at the working frequency of 50Hz, the pressure and the distance of any three points are taken to calculate to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then forming an AB curve on an L-P coordinate system according to the obtained formula; when the dust remover 0-3 operates at the working frequency of 40Hz, the pressure and distance values of any three points are taken to calculate to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then forming a CD curve on an L-P coordinate system according to the obtained formula; when the dust remover 0-3 operates at the working frequency of 30Hz, the pressure and distance values of any three points are taken to calculate to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then according toThe obtained formula forms an EF curve on an L-P coordinate system.

Further, the working frequency of each gradient of the dust remover 0-3 and the corresponding pressure distance curve are prestored as first reference pressure, when the dust remover works in actual operation, under the working condition of the dust-free vehicle 0-2, the detection pressure of each position in the ventilation groove 0-1 is compared with the first reference pressure stored in the corresponding dust remover 0-3 under the working frequency, and whether a gas leakage fault occurs is further judged, as shown in fig. 3, the detection pressure of the GB1 section is obviously greater than the first reference pressure of the GB section, that is, when the system monitors that a certain point of the real-time pressure curve exceeds a reasonable fluctuation range (for example, 50 Pa) and is suddenly increased, the system prompts the G point to have the leakage fault and prompts maintenance.

In some examples of the invention, in order to avoid frequent comparison between the detected pressure and the reference pressure and cause false fault alarm, when the fluctuation of the detected pressure at any position in the ventilation slot 0-1 is less than 50Pa, namely the fluctuation of the detected pressure at any position in the ventilation slot 0-1 is less than 50Pa compared with the previous detected value, the control assembly determines that the pressure fluctuation belongs to reasonable fluctuation, and prompts the normal operation of the ore bin unloading and dust removing system;

when the fluctuation of the detection pressure at any position in the ventilation groove 0-1 is larger than 50Pa, the detection pressure at the position is compared with the first reference pressure at the position, so that the logic comparison frequency of the control assembly is reduced, the loss is reduced, and the false alarm is reduced, and meanwhile, when the detection pressure at the position is larger than the first reference pressure at the position, the control assembly prompts that the position of the ventilation groove 0-1 has the air leakage fault.

In some embodiments of the invention, the reference pressure comprises a second reference pressure, the second reference pressure is the reference pressure of each position in the ventilation groove 0-1 under the operation condition of the dust removing vehicle 0-2, and the second reference pressure satisfies the following conditions:

P2＝k ₁ L ₂ +b ₁ Whereink ₁ ＝-20～-15，b ₁ ＝-45～-40；

P4＝k ₃ L4+b ₃ Wherein k is ₃ ＝0.95～1.15，b ₃ ＝-400～-350；

Wherein P1 is the reference pressure in the groove section at one side of the ventilating groove 0-1 back to the dust removing vehicle 0-2, L1 is the distance between the pressure sensor 1-1 at any position in the groove section at one side of the ventilating groove 0-1 back to the dust removing vehicle 0-2 and the dust remover 0-3, a ₁ 、a ₂ 、a ₃ Calculated by the detected pressure of the pressure sensor 1-1 in the section of the side of the ventilation groove 0-1, which is opposite to the dust removing vehicle 0-2, and the corresponding distance value, for example, the end of the ventilation groove 0-1, which is close to the dust remover 0-3, is a near end, the end of the ventilation groove 0-1, which is far away from the dust remover 0-3, is a far end, P1 is the reference pressure of the section between the near end of the ventilation groove 0-1 and the dust removing vehicle 0-2, L1 is the distance from the pressure sensor 1-1 at any position of the section between the far end of the ventilation groove 0-1 and the dust removing vehicle 0-2 to the dust remover 0-3, a ₁ 、a ₂ 、a ₃ The pressure is obtained by calculating the detection pressure of a pressure sensor 1-1 in the groove section between the far end of the ventilation groove 0-1 and the dust removing vehicle 0-2 and the corresponding distance value;

p2 and P3 are reference pressures in a groove section of the position of the ventilation groove 0-1 adjacent to the dust removing vehicle 0-2, L2 and L3 are distances between the pressure sensor 1-1 at any position in the groove section of the position of the ventilation groove 0-1 adjacent to the dust removing vehicle 0-2 and the dust remover 0-3, and k ₁ 、b ₁ 、k ₂ 、b ₂ The detection pressure and the corresponding distance value of the pressure sensor 1-1 in the groove section of the position of the ventilation groove 0-1 adjacent to the dust removing vehicle 0-2 are calculated to obtain the pressure;

p4 is the reference pressure in the section of the ventilation slot 0-1 between the dust removing vehicle 0-2 and the dust remover 0-3, L4 is the distance between the pressure sensor 1-1 at any position in the section of the ventilation slot 0-1 between the dust removing vehicle 0-2 and the dust remover 0-3, k ₃ 、b ₃ Obtained by calculating the detection pressure of a pressure sensor 1-1 in the groove section of a ventilation groove 0-1 between a dust removing vehicle 0-2 and a dust remover 0-3 and the corresponding distance value,for example, the end of the ventilation slot 0-1 close to the dust remover 0-3 is a near end, the end of the ventilation slot 0-1 far from the dust remover 0-3 is a near end, P4 is a reference pressure in a slot section between the position of the dust removing vehicle 0-2 and the near end of the ventilation slot 0-1, L4 is the distance between the pressure sensor 1-1 at any position in the slot section between the position of the dust removing vehicle 0-2 and the near end of the ventilation slot 0-1 and k is the distance between the dust removing vehicle 0-3 and the dust remover 0-1, and ₃ 、b ₃ through k ₃ 、b ₃ The detection pressure of the pressure sensor 1-1 and the corresponding distance value are calculated and obtained through the detection pressure of the pressure sensor 1-1 in the groove section from the position of the dust removing vehicle 0-2 to the near end of the ventilating groove 0-1 and the corresponding distance value.

Specifically, for the 0-2 operation condition of the dust removing vehicle, a is confirmed ₁ 、a ₂ 、a ₃ The working frequency of each gradient of the dust remover 0-3 can be fixed, then the corresponding values of the pressure and the distance of any three points of the groove section between the near end of the ventilating groove 0-1 and the dust removing vehicle 0-2 are detected and substituted into the formula for calculation, as shown in figure 4, when the dust remover 0-3 runs at the working frequency of 50Hz, the pressure and the distance value of any three points of the groove section between the near end of the ventilating groove 0-1 and the dust removing vehicle 0-2 are taken for calculation to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then forming an AM curve on an L-P coordinate system according to the obtained formula;

confirmation k ₁ 、b ₁ 、k ₂ 、b ₂ During the process, the working frequency of each gradient of the fixed dust remover 0-3 (as shown in figure 4, the working frequency of the fixed dust remover 0-3 is 50 Hz), then the position of the ventilation slot 0-1 where the dust removing vehicle 0-2 is located is determined according to the distance measuring device 1-3 of the dust removing vehicle 0-2, the approximate position of the ventilation slot 0-1 where the trend of the detected pressure at the adjacent position is increased after being reduced is further determined, then the detected pressure and the distance value of any two positions of the trend are taken down, the detected pressure and the distance value of any two positions of the trend are taken up, and the coefficient k is calculated to obtain ₁ 、b ₁ 、k ₂ 、b ₂ Then forming an MQN curve on an L-P coordinate system according to the obtained formula;

confirmation k ₃ 、b ₃ When the dust collector is in use, the working frequency of 0-3 of the fixed dust collector is 50Hz, and the detection is passedThe detection pressure of any two-point pressure sensor 1-1 in the near-end groove section from the position of the dust removing vehicle 0-2 to the ventilating groove 0-1 and the corresponding distance value calculation coefficient k thereof ₃ 、b ₃ And then forming an NB2 curve on the L-P coordinate system according to the obtained formula.

Further, the working frequency of each gradient of the dust remover 0-3 and the corresponding pressure distance curve chart are prestored as second reference pressure, and when the dust remover works in actual work, under the working condition of the dust removing vehicle 0-2, the detection pressure of each position in the ventilation groove 0-1 is compared with the second reference pressure stored in the corresponding working frequency of the dust remover 0-3, and then whether the air leakage fault occurs or not is judged.

In some examples of the invention, in order to avoid frequent comparison between the detected pressure and the reference pressure and fault false alarm, under the operation condition of the dust removing vehicle 0-2, when the fluctuation of the detected pressure at any position in the ventilation groove 0-1 is less than 50Pa, namely the fluctuation of the detected pressure at any position in the ventilation groove 0-1 is less than 50Pa compared with the previous detected value, the control component determines that the pressure fluctuation belongs to reasonable fluctuation, and prompts the normal operation of the ore tank unloading and dust removing system;

when the fluctuation of the detection pressure at any position in the ventilation groove 0-1 is larger than 50Pa, the detection pressure at the position is compared with the second reference pressure at the position, so that the logic comparison times of the control assembly are reduced, the loss is reduced, and the false alarm is reduced, and meanwhile, when the detection pressure at the position is larger than the second reference pressure at the position, the control assembly prompts that the position of the ventilation groove 0-1 has the air leakage fault.

As shown in fig. 4, in some examples, in order to distinguish a pressure distance curve of a detection pressure caused by air leakage from a pressure distance curve change of the dust removing vehicle 0-2 in the operation process under the operation condition of the dust removing vehicle 0-2, and reduce a false judgment rate, a reference pressure in a groove section of a position where the ventilation groove 0-1 is adjacent to the dust removing vehicle 0-2 is changed in a trend of decreasing first and then increasing. Preferably, the trend of the reference pressure in the groove section of the ventilating groove 0-1 adjacent to the position of the dust cart 0-2 is substantially in the shape of a "√". Therefore, the pressure distance change characteristics of the positions of the ventilation slots 0-1 where the dust removing vehicles 0-2 are located in the pressure distance curve are identified, and the fault monitoring accuracy is improved.

In some embodiments of the invention, in order to realize intelligent real-time regulation and control of actual ventilation demand and avoid that the dust remover 0-3 in the related technology runs at full load all the time to cause that the ventilation groove 0-1 is close to one side of the near end of the dust remover 0-3 to form great ventilation waste, the fault monitoring system for ore groove dust removal further comprises a frequency conversion device 1-4, wherein the frequency conversion device 1-4 is respectively connected with a control component and the dust remover 0-3, the control component receives signals sent by a pressure sensor 1-1, a distance measuring device 1-3 and the like, and then judges whether the detection pressure of the ventilation groove 0-1 where the dust removing vehicle 0-2 is located reaches the minimum pressure required for effective dust removal or not according to the signals, so as to dynamically control the working frequency of the dust remover 0-3.

In some embodiments, the detected pressure in the section of the ventilation slot 0-1 adjacent to the location of the dust removing vehicle 0-2 is greater than the preset dust removing pressure P _{Preset of} When the working frequency of the dust remover 0-3 is increased by the control component controlling the frequency conversion device 1-4, when the detection pressure in the groove section of the position of the ventilating groove 0-1 adjacent to the dust removing vehicle 0-2 is less than the preset dust removing pressure P _{Preset of} When the dust collector is used, the control component controls the frequency conversion device 1-4 to reduce the working frequency of the dust collector 0-3, wherein the preset dust removal pressure P _{Preset of} Satisfies the following conditions: -350 Pa.ltoreq.P _{Preset of} Less than or equal to-650 Pa, and preset dust removal pressure P _{Preset of} When the pressure is less than-350 Pa, the negative pressure suction in the section of the ventilating slot 0-1 where the dust removing vehicle 0-2 is positioned can not be ensured, and when the dust removing pressure P is preset _{Preset of} When the pressure is higher than-650 Pa, the negative pressure suction force in the groove section where the dust removing vehicle 0-2 is positioned is far higher than the negative pressure suction force required by dust removal, and great ventilation waste is caused.

Preferably, the dust removal pressure P is preset _{Is preset equal to} The pressure is-500 Pa, so that negative pressure suction required when the ventilation groove 0-1 at the dust removing vehicle 0-2 removes dust is ensured, and great ventilation waste can be avoided.

Referring to fig. 1, in some embodiments of the invention, the invention further comprises a discharge car which is positioned at the top of the mine shaft and can move synchronously with the dust-removing cars 0-2, and the dust outlets of the discharge car are communicated with the dust inlets of the dust-removing cars 0-2, so that the dusty airflow absorbed by the discharge car enters the dust inlets of the dust-removing cars 0-2 through the dust outlets of the discharge car and further enters the ventilating slots 0-1.

Referring to fig. 1, in some alternative embodiments of the invention, the fault monitoring system for the mine shaft dedusting comprises a plurality of in-place switches 1-2, the in-place switches 1-2 are arranged at intervals along the extending direction of the ventilation shaft 0-1, and the opening and closing states of the in-place switches 1-2 reflect the stage positions of the ventilation and dedusting vehicles 0-2 and also serve as a redundant configuration of infrared distance measuring sensors (namely distance measuring devices 1-3) on the ventilation and dedusting vehicles 0-2 to prevent the infrared distance measuring sensors from stopping working under the extreme environment.

Preferably, the in-place switches 1-2 and the pressure sensors 1-1 are arranged in a one-to-one correspondence and uniformly manner, so that fault monitoring can still be performed through the cooperation of the in-place switches 1-2 and the pressure sensors 1-1 under the condition that the distance measuring device 1-3 is damaged.

Optionally, the control assembly includes a PLC controller 1-5 and a computer 1-6 connected to the PLC controller 1-5.

According to the ore tank discharging and dedusting system in the embodiment of the second aspect of the invention, the fault monitoring system for ore tank dedusting in the embodiment of the invention is adopted, and the system has the characteristics of simple structure, easiness in installation and use, reliable fault monitoring result, accurate positioning, high stability and the like.

According to the fault monitoring method of the ore tank discharging and dust removing system in the third aspect of the invention, the fault monitoring system for ore tank dust removal in the embodiment of the invention is adopted, and the fault monitoring method comprises the following steps:

the method comprises the following steps that S1, reference pressures of different positions in a ventilation groove under different working conditions are prestored, wherein the reference pressures comprise a first reference pressure under the working condition of a non-dust-removing vehicle and a second reference pressure under the working condition of a dust-removing vehicle, namely the first reference pressure and the second reference pressure are prestored;

s2, detecting the detection pressure at different positions in the ventilation groove through a pressure sensor;

s3, comparing the detection pressure of the pressure sensor in the step S2 with the first reference pressure or the second reference pressure at the corresponding position according to different operation conditions;

and S4, when the detection pressure at any position in the ventilation groove in the step S2 is greater than the first reference pressure or the second reference pressure at the corresponding position under the corresponding working condition in the step S1, prompting that an air leakage fault occurs at the position in the ventilation groove, wherein the detection pressure at any position in the ventilation groove refers to the detection pressure at the position where the plurality of pressure sensors are located or the position close to the position.

Therefore, according to the fault monitoring method of the ore tank discharging and dust removing system, the reference pressures of different positions in the ventilation tank are prestored, the pressure detection is carried out on the different positions, and the detection pressures under different working conditions are compared with the reference pressures, so that the fault monitoring is carried out on the states in the ventilation tank under different working conditions and different positions.

In some embodiments of the present invention, as shown in fig. 1, the first reference pressure is a reference pressure at each position in the ventilation slot under the operation condition of the dust-free vehicle, and the first reference pressure satisfies that P = a ₁ L ² +a ₂ L+a ₃ Wherein a is ₁ ＝-0.1～-0.08，a ₂ ＝14.5～15.5，a ₃ = -1000 to 0,P is the reference pressure of any position pressure sensor in the ventilation groove, L is the distance between the any position pressure sensor and the dust remover, and a ₁ 、a ₂ 、a ₃ The pressure sensors are obtained by calculating the detection pressure of any three pressure sensors and the corresponding distance value L.

For example, confirm a ₁ 、a ₂ 、a ₃ The working frequency of each gradient of the dust remover can be fixed, then the corresponding values of the pressure and the distance of any three points are detected and substituted into the formula for calculation, and as shown in figure 2, when the dust remover runs at the working frequency of 50Hz, the pressure and the distance value of any three points are taken for calculation to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then according to the obtained formula, the method is carried out at L-Forming an AB curve on the P coordinate system; when the dust remover runs at 40Hz working frequency, the pressure and distance values of any three points are taken to calculate to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then forming a CD curve on an L-P coordinate system according to the obtained formula; when the dust remover runs at the working frequency of 30Hz, the pressure and distance values of any three points are taken to calculate to obtain each coefficient a ₁ 、a ₂ 、a ₃ And forming an EF curve on the L-P coordinate system according to the obtained formula.

Further, the working frequency of each gradient of the dust remover and the corresponding pressure distance curve chart are prestored as first reference pressure, when the dust remover works and operates in actual work, under the working condition of a dust-free vehicle, the detection pressure of each position in the ventilation groove is compared with the first reference pressure of the operation storage under the corresponding working frequency of the dust remover, and whether a gas leakage fault occurs is further judged, for example, as shown in fig. 3, the detection pressure of a GB1 section is obviously greater than the first reference pressure of a GB section, namely when the system monitors that a certain point of the real-time pressure curve chart exceeds a reasonable fluctuation range (for example, +/-50 Pa) and is increased sharply, the system prompts a G point to have the gas leakage fault, and prompts maintenance.

In a further example of the present invention, in order to avoid frequent comparison between the detected pressure and the reference pressure, which may result in false alarm, the step S3 includes: s31, when the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa, the normal operation of the ore groove discharging and dust removing system is prompted, namely, when the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa, namely, the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa compared with the previous detection value, the control assembly determines that the pressure fluctuation belongs to reasonable fluctuation, and the normal operation of the ore groove discharging and dust removing system is prompted.

In a further example of the present invention, the step S4 includes: and S41, when the fluctuation of the detection pressure at any position in the ventilation groove is greater than 50Pa, comparing the detection pressure at the position with the first reference pressure prestored at the position in the step S2, and when the detection pressure at the position is greater than the first reference pressure at the position, prompting the air leakage at the position of the ventilation groove, specifically, when the fluctuation of the detection pressure at any position in the ventilation groove is greater than 50Pa, comparing the detection pressure at the position with the first reference pressure at the position, so as to reduce the logic comparison times of the control assembly, reduce the loss and reduce false alarm, and meanwhile, when the detection pressure at the position is greater than the first reference pressure at the position, prompting the control assembly to generate the air leakage fault at the position of the ventilation groove.

In some embodiments of the present invention, the second reference pressure is a reference pressure at each position in the ventilation slot under the operation condition of the dust removing vehicle, and the second reference pressure satisfies:

P2＝k ₁ L ₂ +b ₁ Wherein k is ₁ ＝-20～-15，b ₁ ＝-45～-40；

P4＝k ₃ L4+b ₃ Wherein k is ₃ ＝0.95～1.15，b ₃ ＝-400～-350；

Wherein, P1 is the reference pressure in the groove section at one side of the ventilation groove back to the dust removing vehicle, L1 is the distance between the pressure sensor at any position in the groove section at one side of the ventilation groove back to the dust removing vehicle and the dust remover, a ₁ 、a ₂ 、a ₃ The pressure value is obtained by calculating the detection pressure of a pressure sensor in the groove section at one side of the ventilation groove, which is back to the dust removal vehicle, and the corresponding distance value, for example, the end of the ventilation groove, which is close to the dust remover, is a near end, the end of the ventilation groove, which is far away from the dust remover, is a far end, P1 is the reference pressure of the groove section between the near end of the ventilation groove and the dust removal vehicle, L1 is the distance between the far end of the ventilation groove and the dust removal vehicle, and a is the distance between the pressure sensor at any position of the groove section between the far end of the ventilation groove and the dust removal vehicle ₁ 、a ₂ 、a ₃ The pressure sensor is used for detecting the pressure of the pressure sensor in the groove section between the far end of the ventilation groove and the dust removing vehicle;

p2 and P3 are reference pressures in a groove section of the position of the ventilation groove adjacent to the dust removing vehicle, L2 and L3 are distances between a pressure sensor at any position in the groove section of the position of the ventilation groove adjacent to the dust removing vehicle and the dust remover, and k is the distance between the pressure sensor at any position and the dust remover ₁ 、b ₁ 、k ₂ 、b ₂ The detection pressure and the corresponding distance value of the pressure sensor in the groove section of the position, adjacent to the dust removing vehicle, of the ventilation groove are calculated;

p4 is the reference pressure in the groove section of the ventilation groove between the dust removing vehicle and the dust remover, L4 is the distance between the pressure sensor at any position in the groove section of the ventilation groove between the dust removing vehicle and the dust remover, and k is the distance between the pressure sensor at any position and the dust remover ₃ 、b ₃ The pressure value is calculated by the pressure sensor in the groove section of the ventilation groove between the dust removing vehicle and the dust remover and the corresponding distance value, for example, the end of the ventilation groove close to the dust remover is a near end, the end of the ventilation groove far away from the dust remover is a near end, P4 is the reference pressure in the groove section between the position of the dust removing vehicle and the near end of the ventilation groove, L4 is the distance between the pressure sensor in any position in the groove section between the position of the dust removing vehicle and the near end of the ventilation groove and the dust remover, k ₃ 、b ₃ Through k ₃ 、b ₃ The detection pressure of the pressure sensor and the corresponding distance value are calculated and obtained through the detection pressure of the pressure sensor in the groove section from the position of the dust removing vehicle to the near end of the ventilation groove and the corresponding distance value.

Specifically, for the operation condition of the dust removing vehicle, a is confirmed ₁ 、a ₂ 、a ₃ The working frequency of each gradient of the dust remover can be fixed, then the corresponding values of the pressure and the distance of any three points of the groove section between the near end of the ventilating groove and the dust removing vehicle are detected and substituted into the formula for calculation, and as shown in figure 4, when the dust remover runs at the working frequency of 50Hz, the pressure and the distance of any three points of the groove section between the near end of the ventilating groove and the dust removing vehicle are taken to calculate each coefficient a ₁ 、a ₂ 、a ₃ Then forming an AM curve on an L-P coordinate system according to the obtained formula;

confirmation k ₁ 、b ₁ 、k ₂ 、b ₂ By fixing the dust-catcherThe working frequency of each gradient (as shown in fig. 4, the working frequency of the fixed dust remover is 50 Hz), then the position of the ventilation slot where the dust removing vehicle is located is determined according to the distance measuring device of the dust removing vehicle, the approximate position of the ventilation slot where the trend that the detection pressure of the adjacent position is reduced first and then increased is determined, then the detection pressure and the distance value of any two positions of the reduced trend are taken, the detection pressure and the distance value of any two positions of the increased trend are taken, and the coefficient k is calculated to obtain ₁ 、b ₁ 、k ₂ 、b ₂ Then forming an MQN curve on an L-P coordinate system according to the obtained formula;

confirmation k ₃ 、b ₃ When in use, the working frequency of the fixed dust remover is 50Hz, and the coefficient k is calculated by detecting the detection pressure of any two-point pressure sensor from the position of the dust removing vehicle to the near-end groove section of the ventilating groove and the corresponding distance value of the pressure sensor ₃ 、b ₃ And then forming an NB2 curve on the L-P coordinate system according to the obtained formula.

And further, the working frequency of each gradient of the dust remover and the corresponding pressure distance curve chart are prestored and used as second reference pressure, and when the dust remover works and operates in actual work, under the working condition of a dust removing vehicle, the detection pressure of each position in the ventilation groove is compared with the second reference pressure of the dust remover under the corresponding working frequency, so that whether the air leakage fault occurs or not is judged.

In a further example of the present invention, in order to avoid frequent comparison between the detected pressure and the reference pressure, which may result in false alarm, the step S3 includes: s31, when the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa, prompting the ore groove discharging and dust removing system to normally operate, namely, when the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa, namely the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa compared with the previous detection value, the control assembly determines that the fluctuation belongs to reasonable fluctuation, and prompting the ore groove discharging and dust removing system to normally operate.

In a further example of the present invention, said step S4 comprises: and S41, when the fluctuation of the detection pressure at any position in the ventilation groove is greater than 50Pa, comparing the detection pressure at the position with the second reference pressure prestored in the step S2, and when the detection pressure at the position is greater than the second reference pressure at the position, prompting the air leakage at the position of the ventilation groove, specifically, when the fluctuation of the detection pressure at any position in the ventilation groove is greater than 50Pa, comparing the detection pressure at the position with the second reference pressure at the position, so as to reduce the logic comparison times of the control assembly, reduce the loss and reduce false alarm, and meanwhile, when the detection pressure at the position is greater than the second reference pressure at the position, prompting the air leakage fault at the position of the ventilation groove by the control assembly at the moment.

The method for controlling the frequency conversion of the ore tank discharging and dust removing system according to the fourth aspect of the invention is described below with reference to the attached figure 1.

According to the frequency conversion control method of the ore tank unloading and dust removing system provided by the embodiment of the invention, the fault monitoring system for ore tank dust removal provided by the embodiment of the first aspect of the invention is adopted, and the frequency conversion control method comprises the following steps:

s1, measuring the distance between a dust removing vehicle and a dust remover, determining the position of a ventilation groove where the dust removing vehicle is located, for example, measuring the position of the ventilation groove where the dust removing vehicle is located through a distance measuring device, and confirming the position through an in-place switch, so that the accuracy is improved;

s2, detecting the detection pressure at the position according to the position of the ventilation slot where the dust removing vehicle is located, which is determined in the step S1;

s3, comparing the detection pressure in the step S2 with a preset dust removal pressure P _{Preset of} Comparing, wherein-350 Pa is less than or equal to P _{Preset of} Less than or equal to-650 Pa, and preset dust removal pressure P _{Preset of} When the pressure is less than-350 Pa, the negative pressure suction in the ventilating slot section where the dust removing vehicle is positioned can not be ensured, and when the dust removing pressure P is preset _{Preset of} When the pressure is higher than-650 Pa, the negative pressure suction force in the groove section where the dust removing vehicle is positioned is far higher than the negative pressure suction force required by dust removal, and great ventilation waste is caused;

s4, when the detection pressure is less than the preset dust removal pressure P _{Preset of} When the detected pressure is higher than the preset dust-removing pressure P, the power of the dust remover is reduced _Preset And increasing the power of the dust remover.

Therefore, according to the frequency conversion control method of the ore tank unloading and dust removing system provided by the embodiment of the invention, the detection pressure at the position of the ventilation tank where the dust removing vehicle is located is detected and is matched with the preset dust removing pressure P _{Preset of} Compared with the prior art, the negative pressure suction force in the groove section of the ventilation groove where the dust removing vehicle is located can be ensured, the situation that the negative pressure suction force in the groove section where the dust removing vehicle is located is far larger than the negative pressure suction force required by dust removal, so that great ventilation waste is caused can be avoided, the dynamic adjustment of the working frequency of the dust remover is realized in the operation process of the dust removing vehicle, the energy conservation and the consumption reduction are achieved, and the service life of parts is prolonged.

In some embodiments of the present invention, to further avoid the waste of ventilation and ensure the negative pressure suction, the dust removal pressure P is preset _Preset Satisfies the following conditions: -450 Pa.ltoreq.P _{Preset of} ≤-550Pa。

In some embodiments of the present invention, before step S1, the following steps are further included: s11, whether the ventilation groove leaks air or not is detected, and when the ventilation groove is detected to leak air from any position, the ventilation groove is prompted to have a leakage fault at the position in the ventilation groove.

Therefore, under the operating condition of the dust removing vehicle, air leakage fault detection is performed firstly, and then frequency conversion regulation and control are performed, so that the phenomenon that the air leakage condition is increased due to the fact that the working frequency of the dust remover is increased under the air leakage fault is avoided.

In a further embodiment of the invention, step S11 comprises the steps of:

s111, prestoring reference pressures of different positions in the ventilation groove under different working conditions, wherein the reference pressures comprise a first reference pressure under the working condition of no dust removing vehicle operation and a second reference pressure under the working condition of dust removing vehicle operation, namely prestoring the first reference pressure and the second reference pressure;

s112, detecting the detection pressure at different positions in the ventilation groove through a pressure sensor;

s113, comparing the detection pressure of the pressure sensor in the step S112 with the first reference pressure or the second reference pressure at the corresponding position according to different operation conditions;

and S114, when the detected pressure at any position in the ventilation groove in the step S112 is greater than the first reference pressure or the second reference pressure at the corresponding position under the corresponding working condition in the step S111, prompting that an air leakage fault occurs at the position in the ventilation groove, namely, under the working condition that the dust removing vehicle runs, comparing the detected pressure in the ventilation groove in the step S112 with the second reference pressure at the corresponding position in the step S111, and when the detected pressure is steeply increased compared with the second reference pressure, prompting that the air leakage fault occurs at the position.

In some embodiments of the invention, the first reference pressure is a reference pressure at each position in the ventilation groove under the operation condition of the dust-free vehicle, the first reference pressure satisfies that P = a ₁ L ² +a ₂ L+a ₃ Wherein a is ₁ ＝-0.1～-0.08，a ₂ ＝14.5～15.5，a ₃ = -1000 to 0,P is the reference pressure of any position pressure sensor in the ventilation groove, L is the distance between the any position pressure sensor and the dust remover, and a ₁ 、a ₂ 、a ₃ The pressure sensors are obtained by calculating the detection pressure of any three pressure sensors and the corresponding distance value L.

For example, confirm a ₁ 、a ₂ 、a ₃ The working frequency of each gradient of the dust remover can be fixed, then the corresponding values of the pressure and the distance of any three points are detected and substituted into the formula for calculation, and as shown in figure 2, when the dust remover runs at the working frequency of 50Hz, the pressure and the distance value of any three points are taken for calculation to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then forming an AB curve on an L-P coordinate system according to the obtained formula; when the dust remover runs at 40Hz working frequency, the pressure and distance values of any three points are taken to calculate to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then forming a CD curve on an L-P coordinate system according to the obtained formula; when the dust remover runs at the working frequency of 30Hz, the pressure and distance values of any three points are taken to calculate to obtain each coefficient a ₁ 、a ₂ 、a ₃ Then according to the obtained formula in the L-P coordinate systemAbove, an EF curve is formed.

In a further example of the present invention, in order to avoid frequent comparison between the detected pressure and the reference pressure, which may result in false alarm, the step S113 includes: when the fluctuation of the detection pressure at any position in the ventilation groove is less than 50Pa, the normal operation of the ore groove discharging and dust removing system is prompted, namely, when the fluctuation of the detection pressure at any position in the ventilation groove is less than 50Pa, namely, the fluctuation of the detection pressure at any position in the ventilation groove is less than 50Pa compared with the previous detection value, the control assembly determines that the fluctuation belongs to reasonable fluctuation, and the normal operation of the ore groove discharging and dust removing system is prompted;

when the fluctuation of the detection pressure at any position in the ventilation groove is greater than 50Pa, comparing the detection pressure at the position with the first reference pressure at the position prestored in the step S112, and when the detection pressure at the position is greater than the first reference pressure at the position, prompting the air leakage at the position of the ventilation groove.

In some embodiments of the present invention, the second reference pressure is a reference pressure at each position in the ventilation slot under the operation condition of the dust-removing vehicle, and the second reference pressure satisfies the following conditions:

P2＝k ₁ L ₂ +b ₁ Wherein k is ₁ ＝-20～-15，b ₁ ＝-45～-40；

P4＝k ₃ L4+b ₃ Wherein k is ₃ ＝0.95～1.15，b ₃ ＝-400～-350；

p4 is the reference pressure in the channel section of the ventilation channel between the dust-removing vehicle and the dust remover, L4 is the reference pressure in the ventilation channel between the dust-removing vehicle and the dust removerDistance k of pressure sensor at any position in groove section of ventilation groove between dust collectors from dust collector ₃ 、b ₃ The pressure value is calculated by the pressure sensor in the groove section of the ventilation groove between the dust removing vehicle and the dust remover and the corresponding distance value, for example, the end of the ventilation groove close to the dust remover is a near end, the end of the ventilation groove far away from the dust remover is a near end, P4 is the reference pressure in the groove section between the position of the dust removing vehicle and the near end of the ventilation groove, L4 is the distance between the pressure sensor in any position in the groove section between the position of the dust removing vehicle and the near end of the ventilation groove and the dust remover, k ₃ 、b ₃ Through k ₃ 、b ₃ The detection pressure of the pressure sensor and the corresponding distance value are calculated and obtained through the detection pressure of the pressure sensor in the groove section from the position of the dust removing vehicle to the near end of the ventilation groove and the corresponding distance value.

confirmation k ₁ 、b ₁ 、k ₂ 、b ₂ During the process, the working frequency of each gradient of the dust remover can be fixed (as shown in fig. 4, the working frequency of the fixed dust remover is 50 Hz), then the position of the ventilation groove where the dust remover is located is determined according to the distance measuring device of the dust remover, the approximate position of the ventilation groove where the trend that the detection pressure of the adjacent position is reduced firstly and then increased is determined, then the detection pressure and the distance value of any two positions of the reduced trend are taken, the detection pressure and the distance value of any two positions of the increased trend are taken, and the coefficient k is calculated to obtain ₁ 、b ₁ 、k ₂ 、b ₂ Then according to the obtained formula in L-P coordinateForming an MQN curve;

And further, the working frequency of each gradient of the dust remover and a corresponding pressure distance curve chart are prestored and used as second reference pressure, and when the dust remover works and operates in actual work, under the working condition of a dust removing vehicle, the detection pressure of each position in the ventilation groove is compared with the second reference pressure stored in the ventilation groove under the corresponding working frequency of the dust remover, so that whether the air leakage fault occurs or not is judged.

In a further example of the present invention, in order to avoid frequent comparison between the detected pressure and the reference pressure, which may result in false alarm, the step S113 includes: when the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa, the normal operation of the ore groove discharging and dust removing system is prompted, namely, when the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa, namely, the fluctuation of the detection pressure at any position in the ventilation groove is smaller than 50Pa compared with the previous detection value, the control assembly determines that the fluctuation belongs to reasonable fluctuation, and the normal operation of the ore groove discharging and dust removing system is prompted.

When the fluctuation of the detection pressure at any position in the ventilation groove is greater than 50Pa, comparing the detection pressure at the position with the second reference pressure at the position prestored in the step S112, and when the detection pressure at the position is greater than the second reference pressure at the position, prompting the air leakage at the position of the ventilation groove.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.

In the description of the invention, "over," "above," and "on" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

Other configurations and operations of the system for fault monitoring of mine pit dust removal, the system for mine pit dust removal and the method for fault monitoring of the system for mine pit dust removal and discharge are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fault monitoring system for mine pit dust removal is characterized by comprising:

the dust removal channel is arranged close to the ore tank and limits a closed ventilation groove, and the dust removal channel is provided with a dust removal track;

the dust removing vehicle is movably arranged on the dust removing track and is provided with a dust inlet and a dust outlet, and the dust outlet can be communicated with the ventilation groove in the moving process;

the dust remover is arranged at one end of the dust removing channel and is communicated with the ventilation groove so as to remove dust in the ventilation groove;

the pressure sensors are arranged at intervals along the extending direction of the ventilation groove, and each pressure sensor can detect the pressure at the position of the ventilation groove;

the distance measuring device is arranged on the dust removing vehicle to measure the distance between the dust removing vehicle and the dust remover;

a control component, wherein the control component is internally pre-stored with a reference pressure and a preset dust removal pressure P _{Preset of} The control assembly is respectively connected with the pressure sensors, the distance measuring device and the dust remover and compares the detection pressure of the pressure sensors, the distance signal of the distance measuring device and the reference pressure for fault monitoring;

and the frequency conversion device is respectively connected with the control assembly and the dust remover so as to dynamically control the working frequency of the dust remover according to the control signal of the control assembly.

2. The fault monitoring system for mine pit dedusting according to claim 1, wherein the reference pressure comprises a first reference pressure that, under non-dedusting vehicle operating conditions, satisfies: p = a ₁ L ² +a ₂ L+a ₃ Wherein a is ₁ ＝-0.1～-0.08，a ₂ ＝14.5～15.5，a ₃ = -1000 to 0,P is the reference pressure of any position pressure sensor in the ventilation groove, L is the distance between the any position pressure sensor and the dust remover, and a ₁ 、a ₂ 、a ₃ The pressure sensors are obtained by calculating the detection pressure of any three pressure sensors and the corresponding distance value L.

3. The fault monitoring system for mine pit dedusting according to claim 2,

when the fluctuation of the detection pressure at any position in the ventilation groove is less than 50Pa, the control assembly prompts the normal operation of the ore groove discharging and dust removing system;

when the fluctuation of the detection pressure at any position in the ventilation groove is larger than 50Pa, the detection pressure at the position is compared with the first reference pressure at the position, and when the detection pressure at the position is larger than the first reference pressure at the position, the control component prompts the position of the ventilation groove to leak air.

4. The fault monitoring system for mine pit dedusting according to claim 1, wherein the reference pressure comprises a second reference pressure that, under the operating conditions of the dedusting vehicle, satisfies:

P2＝k ₁ L ₂ +b ₁ Wherein k is ₁ ＝-20～-15，b ₁ ＝-45～-40；

P4＝k ₃ L4+b ₃ Wherein k is ₃ ＝0.95～1.15，b ₃ ＝-400～-350；

Wherein P1 is the reference pressure in the groove section at one side of the ventilation groove back to the dust removal vehicle, and L1 is the distance between any position pressure sensor in a groove section at one side of the ventilation groove back to the dust removal vehicle and the dust remover, a ₁ 、a ₂ 、a ₃ Obtained by calculating the detection pressure of the pressure sensor in the groove section at one side of the ventilation groove back to the dust removing vehicle and the corresponding distance value,

p2 and P3 are reference pressure in a groove section of the position where the ventilating groove is adjacent to the dust removing vehicle, L2 and L3 are distances between any position pressure sensor in the groove section of the position where the ventilating groove is adjacent to the dust removing vehicle and the dust remover, and k is the distance between any position pressure sensor and the dust remover ₁ 、b ₁ 、k ₂ 、b ₂ Obtained by calculating the detection pressure of the pressure sensor in the groove section of the position of the ventilating groove adjacent to the dust removing vehicle and the corresponding distance value,

p4 is the reference pressure in the groove section of the ventilation groove between the dust removing vehicle and the dust remover, L4 is the distance between the pressure sensor at any position in the groove section of the ventilation groove between the dust removing vehicle and the dust remover, and k is the distance between the pressure sensor at any position and the dust remover ₃ 、b ₃ And the pressure value is obtained by calculating the detection pressure of the pressure sensor in the groove section of the ventilation groove between the dust removing vehicle and the dust remover and the corresponding distance value.

5. The fault monitoring system for mine pit dedusting according to claim 4,

when the fluctuation of the detection pressure of any position in the groove section of one side of the ventilation groove, which is back to the dust removal vehicle, is greater than 50Pa, comparing the detection pressure of the position with the second reference pressure of the position, and when the detection pressure of the position is greater than the second reference pressure of the position, prompting the position of the ventilation groove to leak air by the control assembly;

when the fluctuation of the detection pressure at any position in the groove section of the ventilation groove between the dust removing vehicle and the dust remover is larger than 50Pa, the detection pressure at the position is compared with the second reference pressure at the position, and when the detection pressure at the position is larger than the second reference pressure at the position, the control component prompts the air leakage at the position of the ventilation groove.

6. The fault monitoring system for mine pit dedusting according to claim 4, wherein the reference pressure in the section of the ventilation groove adjacent to the dedusting vehicle is changed in a descending trend and then an increasing trend.

7. The fault monitoring system for mine pit dedusting according to claim 6, wherein the trend of the reference pressure change in the section of the ventilation pit adjacent to the location of the dedusting vehicle is substantially in the shape of a "√".

8. The fault monitoring system for mine pit dedusting according to claim 6 or 7,

when the detection pressure in the groove section of the ventilation groove adjacent to the position of the dust removing vehicle is greater than the preset dust removing pressure P _{Preset of} When the dust remover works, the control component controls the frequency conversion device to increase the working frequency of the dust remover;

when the detection pressure in the groove section of the ventilation groove adjacent to the position of the dust removing vehicle is less than the preset dust removing pressure P _{Preset of} When the dust collector works, the control component controls the frequency conversion device to reduce the working frequency of the dust collector,

wherein the preset dust removal pressure P _{Preset of} Satisfies the following conditions: -350 Pa.ltoreq.P _{Preset of} ≤-650Pa。

9. The utility model provides a dust pelletizing system is unloaded to ore deposit groove which characterized in that includes: a fault monitoring system for mine pit dusting according to any of claims 1-8.

10. A frequency conversion control method of a mine groove discharging and dust removing system, wherein the mine groove discharging and dust removing system adopts the mine groove dust removing fault monitoring system according to any one of claims 1-8, and the frequency conversion control method comprises the following steps:

s1, measuring the distance between a dust removal vehicle and a dust remover, and determining the position of a ventilation groove where the dust removal vehicle is located;

s2, detecting the detection pressure of the dust removing vehicle at the position of the ventilation groove;

s3, comparing the detection pressure in the step S2 with a preset dust removal pressure P _{Preset of} Comparing, wherein-350 Pa is less than or equal to P _{Preset of} ≤-650Pa；

S4, when the detection pressure is less than the preset dust removal pressure P _{Preset of} When the working frequency of the dust remover is reduced, the detection pressure is greater than the preset dust removing pressure P _{Preset of} And increasing the working frequency of the dust remover.

11. The variable frequency control method of the ore bin discharge dedusting system of claim 10, wherein the preset dedusting pressure P is _{Preset of} Satisfies the following conditions: -450 Pa.ltoreq.P _{Preset of} ≤-550Pa。

12. The variable frequency control method of the ore bin discharge dedusting system according to claim 10, characterized by further comprising the following steps before the step S1:

13. The variable frequency control method of the ore bin discharge dedusting system of claim 12, wherein the step S11 comprises:

s111, pre-storing reference pressures at different positions in the ventilation groove, wherein the reference pressures comprise a first reference pressure under the operation condition of a non-dust-removing vehicle and a second reference pressure under the operation condition of a dust-removing vehicle;

s112, detecting the detection pressure at the position where the pressure sensors are located respectively by the plurality of pressure sensors;

s113, comparing the detected pressure of step S112 with the reference pressure at the corresponding position prestored in step S111;

s114, when the detected pressure at any position in the ventilation groove in the step S112 is larger than the reference pressure at the corresponding position in the ventilation groove pre-stored in the step S111, prompting that an air leakage fault occurs at the position in the ventilation groove.

14. The variable frequency control method of the ore bin discharge and dust removal system according to claim 13, wherein the first reference pressure satisfies: p = a ₁ L ² +a ₂ L+a ₃ Wherein a is ₁ ＝-0.1～-0.08，a ₂ ＝14.5～15.5，a ₃ = -1000-0,P is the reference pressure of the pressure sensor at any position in the ventilation groove, L is the distance between the pressure sensor at any position and the dust remover, and a ₁ 、a ₂ 、a ₃ The pressure sensors are obtained by calculating the detection pressure of any three pressure sensors and the corresponding distance value L.

15. The variable frequency control method of the ore bin discharging and dedusting system according to claim 14, wherein the step S113 comprises:

when the fluctuation of the detection pressure at any position in the ventilation groove is less than 50Pa, prompting the normal operation of the ore groove discharging and dust removing system;

when the fluctuation of the detected pressure at any position in the ventilation groove is larger than 50Pa, comparing the detected pressure at the position with the first reference pressure prestored in the step S112, and when the detected pressure at the position is larger than the first reference pressure at the position, prompting that air leaks from the position of the ventilation groove.

16. The variable frequency control method of the ore bin discharge and dust removal system according to claim 13, wherein the second reference pressure satisfies:

P2＝k ₁ L ₂ +b ₁ Wherein k is ₁ ＝-20～-15，b ₁ ＝-45～-40；

P4＝k ₃ L4+b ₃ Wherein k is ₃ ＝0.95～1.15，b ₃ ＝-400～-350；

Wherein, P1 is the reference pressure in the groove section at one side of the ventilation groove back to the dust removal vehicle, L1 is the distance between the pressure sensor and the dust remover at any position in the groove section at one side of the ventilation groove back to the dust removal vehicle, a ₁ 、a ₂ 、a ₃ Obtained by calculating the detection pressure of the pressure sensor in the groove section at one side of the ventilation groove back to the dust removing vehicle and the corresponding distance value,

p2 and P3 are reference pressure in a groove section of the position where the ventilating groove is adjacent to the dust removing vehicle, L2 and L3 are distances between the pressure sensor and the dust remover at any position in the groove section of the position where the ventilating groove is adjacent to the dust removing vehicle, and k is the distance between the pressure sensor and the dust remover ₁ 、b ₁ 、k ₂ 、b ₂ Obtained by calculating the detection pressure of the pressure sensor in the groove section of the position of the ventilating groove adjacent to the dust removing vehicle and the corresponding distance value,

17. The variable frequency control method of the ore bin discharge dedusting system of claim 16, wherein the step S113 comprises:

when the fluctuation of the detection pressure at any position in the ventilation groove is larger than 50Pa, comparing the detection pressure at the position with the second reference pressure prestored in the step S112, and when the detection pressure at the position is larger than the second reference pressure at the position, prompting that air leaks from the position of the ventilation groove.