CN104594981A - Efficient tail gas particle purification system of mining rubber-tyred vehicle - Google Patents
Efficient tail gas particle purification system of mining rubber-tyred vehicle Download PDFInfo
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- CN104594981A CN104594981A CN201410704341.7A CN201410704341A CN104594981A CN 104594981 A CN104594981 A CN 104594981A CN 201410704341 A CN201410704341 A CN 201410704341A CN 104594981 A CN104594981 A CN 104594981A
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Abstract
The invention belongs to the technical field of tail gas emission of transportation equipment of mining rubber-tyred vehicles for underground coal mines and particularly relates to an efficient tail gas particle purification system of a mining rubber-tyred vehicle. The efficient tail gas particle purification system solves the problem that in the running process of existing mining rubber-tyred vehicles for underground coal mines, tail gas particle emission performance exceeds standards seriously. The efficient tail gas particle purification system of the mining rubber-tyred vehicle comprises an exhaust pipe and an exhaust tail pipe and further comprises a tail gas particle purification device and a display and warning system, the tail gas particle purification device comprises an exhaust safety device and a tail gas particle catcher arranged between the exhaust pipe and the exhaust tail pipe, the tail gas particle catcher comprises multiple levels of catcher bodies arranged in a shell in sequence, the catcher body of each level is formed by stacking a plurality of metal foam sheets, the metal foam sheets are made of Fe-Cr-Al in a firing mode, have different hole diameters and have the thicknesses of 3 mm-5 mm, and the hole diameters of the metal foam sheets in the levels of catcher bodies gradually decrease.
Description
Technical field
The invention belongs to the technical field of underground coal mine mining rubber-tired cart haulage device exhaust emissions, be specifically related to the efficient exhaust particulate cleaning system of a kind of mining rubber-tired cart.
Background technique
The present invention is in order to mainly solve existing underground coal mine mining rubber-tired cart engine exhaust carbon soot particles discharge severe overweight problem; Adopt the particles used catcher of surface car, reproducible must be increased, but down-hole forbids to use naked light and surface temperature higher than 150 DEG C, therefore regenerative system cannot be installed, cause using that the blocking of conventional particles catcher is serious, purification efficiency is poor, this system effectively can solve the problem that particle trap blocks and purification efficiency is low, increases the passive regeneration cycle, and the working life extending particle trap provides the efficient exhaust particulate cleaning system of a kind of mining rubber-tired cart.This system is used for mining rubber-tired cart tail gas clean-up, the layering mode of going forward one by one is adopted to catch the soot particulate absorbed in tail gas, efficient reduction carbon smoke exhaust, simultaneously because special subsurface environment cannot realize the automatic regeneration of particle trap, solve the use of prolongation exhaust particulate purification plant, regeneration period; This system adopts display and alarm system to remind mining rubber-tired cart driver regeneration purification apparatus; The normal work affecting motor is blocked in order to prevent exhaust particulate catcher, devise safe venting device, when exhaust back pressure exceeds design pressure, automatically safety installations is opened, partial tail gas is directly discharged, and rubber-tired cart travels to safety zone, after being dismantled by exhaust particulate catcher, adopt combustion manner to carry out regeneration purification, reinstall to use after purification.
Summary of the invention
The present invention in order to solve the mining rubber-tired cart of existing underground coal mine in running, exhaust particulate thing emission performance severe overweight, down-hole is in relatively airtight space, cause down-hole miner occur tuberculosis probability increase problem; Improve purification efficiency, extend regeneration period and the life-span of particle trap, a kind of mining rubber-tired cart exhaust particulate cleaning system is provided; After realization absorption sediments will block catcher, display and alarm function are played to driver.
The present invention takes following technological scheme: a kind of mining rubber-tired cart exhaust particulate cleaning system, comprise outlet pipe and tailpipe, also comprise exhaust particulate purification plant and display and alarm system, described exhaust particulate purification plant comprises safe venting device and is arranged on the exhaust particulate catcher between outlet pipe and tailpipe, described exhaust particulate catcher comprises the some grades of catchers being arranged on and being arranged in order in housing, and the catcher of every one-level all adopts some by Fe-Cr-Al(CeO
2) fire form different pore size thickness be 3-5mm metal foam sheet superposition composition, the decreasing pore size of metal foam sheet in every one-level catcher.The outer Fractions of Diesel Engine Exhaust Particulates catcher core body of Current Domestic is based on cordierite honeycomb ceramic and Fe-Cr-Al, Ni-Cr-Al metal alloy foamed material, and cordierite honeycomb ceramic is that its specific surface area of particle trap that core body makes is little, and adsorptive power is stronger; And metal alloy foam adopts foaming structure to add specific surface area, but it adopts metal to be that its adsorption performance of main component is more weak with ceramic phase.The present invention, adopts with Fe, Cr, Al, CeO
2be main, the metal foam sheet fired according to a certain ratio, when adding specific surface area, enhances the adsorptive power on surface, substantially increases the capturing ability of particle in tail gas.Exhaust particulate catcher inside is communicated with the circular hole of hollow, and safe venting device is installed on the afterbody of circular hole in exhaust particulate catcher.
Described display and alarm system comprise the Pneumatic power diaphragm type control mechanism and pressure indicator that are connected with outlet pipe, Pneumatic power diaphragm type control mechanism respectively with indicator, cut off and stir valve and gas holder is connected, cut off and stir valve and be connected with buzzer.
The pressurization control cylinder that described Pneumatic power diaphragm type control mechanism comprises pneumatic control valve and is connected with outlet pipe, the diaphragm spool of pressurization control cylinder is connected with the spool of pneumatic control valve, pneumatic control valve is by gas holder air feed, and pneumatic control valve is stirred valve with indicator and cut-out respectively and is connected.
Described safe venting device comprises caulking gum, sealed valve body, return spring and valve seat, valve seat installs the afterbody of circular hole in exhaust particulate catcher housing, valve seat is provided with sealed valve body, and between valve seat, sealed valve body is provided with return spring, and sealed valve body is provided with caulking gum.
Exhaust particulate catcher comprises I grade of catcher, II grade of catcher, III grade of catcher and IV grade of catcher, and the metal foam sheet that I grade of catcher is 3mm by 20-30 thickness forms, and metal foam sheet filter opening diameter is 2800-3000 μm; II grade of catcher is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 2000-2200 μm; III grade of catcher is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 1400-1600 μm; IV grade of catcher is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 450-600 μm.
Display and alarm system are connected with the pressure test connecting base be arranged on outlet pipe by pipeline.
Exhaust particulate catcher is primarily of laying catcher at different levels and providing the housing installing safe venting device passage, I grade of catcher, II grade of catcher, III grade of catcher, the compositions such as IV grade of catcher and adjustment locking nut, I-IV grade of catcher is made up of respectively filter precision metal foam filtering material from small to large, utilizes adjustment locking nut it to be fasteningly installed in housing.Anti-explosion diesel engine exhaust airstream is when by exhaust particulate catcher, produce inertial collision with catcher at different levels respectively and receive the interception of catcher, larger particles is adsorbed in I grade of catcher, medium grain is adsorbed in II grade of catcher, in tail gas, particle is successively by the catcher of different accuracy, the layering reaching exhaust particulate is gone forward one by one seizure, realizes tail gas high-efficient purification; Adopt the particle substep of diverse location to catch simultaneously, realizing uniform particles is adsorbed in all metal foam filtering materials, extend the regeneration period of catcher, so decrease utilize burner heat to metal foaming material regeneration times, extend its working life; In addition, the metal foaming material that catcher adopts can require to select different accuracy metal foaming material and its installation quantity according to different smoke intensities, ensures that mining rubber-tired cart reaches the smoke emission requirement of regulation.
Exhaust particulate cleaning system adds safe venting device in addition, the arrangement achieves flame proof rubber tyre vehicle in the running of down-hole, occur that exhaust particulate catcher long-time continuous uses, too much sediments, adsorption particle will block catcher, cannot scene carry out regeneration process time, safe venting device is opened automatically, ensure the smooth in exhaust of anti-explosion diesel engine, guarantee flame proof rubber tyre vehicle power performance, after rubber-tired cart can move to home, driver carries out regeneration process to catcher.
Described Pneumatic power diaphragm type control mechanism by pneumatic control valve and pressurization control cylinder integrated, dynamic pressurization control cylinder diaphragm spool is along with the increase of explosion-proof diesel engine exhaust pipe exhaust back pressure, spool is moved to the left, promote pneumatic control valve core, make accumulator and Control director, buzzer pipeline connection, realize warning function.
Described display and alarm system, play prompting, warning in systems in which, plays vital effect for ensureing that mining rubber-tired cart normally runs and reduces down-hole pollution.
Working procedure: anti-explosion diesel engine gas exhaust manifold is connected with outlet pipe, clamping bolt, tightening nut, loosen packing ring exhaust particulate catcher and outlet pipe and tailpipe are connected to become a sealing channel, safe venting device is installed by exhaust particulate catcher central authorities.Rubber-tired cart is in running, anti-explosion diesel engine tail gas air-flow passes through outlet pipe, as Fig. 5,6 exhaust gas flow to flow in schematic diagram shown in " catcher work exhaust gas flow flows to schematic diagram ", air-flow is along catcher axial flow, total amount 25%-35% is accounted for by I grade of catcher absorption larger particles, II grade of catcher adsorption particle thing accounts for total amount 20%-30%, III grade of catcher adsorbs comparatively small particle and accounts for total amount 10%-15%, IV grade of catcher absorption finely ground particles, the particulate matters such as anti-explosion diesel engine soot smoke intensity after four times are filtered can reduce by 80%-90%, after the exhaust particulate catcher long period uses, adsorption particle and deposited particles block the metal foaming material of catcher at different levels, explosion-proof diesel engine exhaust pipe pressure is caused to raise, when back pressure can according to different its cracking pressures of anti-explosion diesel engine property regulation more than 25-30KPa(), tail gas promotes sealed valve body, compression retracteding position spring, side through hole in exhaust particulate catcher is opened, exhaust gas flow is along exhaust particulate catcher endoporus, pass through safe venting device, directly arrange in extraneous along tailpipe that (airflow direction is as Fig. 5, it is shown that 6 exhaust gas flow flow to " catcher blocking inefficacy exhaust gas flow flows to schematic diagram " in schematic diagram).Safe venting device ensures the smooth in exhaust of anti-explosion diesel engine, guarantees flame proof rubber tyre vehicle power performance, and after rubber-tired cart can move to home, driver carries out regeneration process to catcher.
Exhaust particulate catcher uses for a long time, exhaust back pressure is more than after 35KPa, considerable influence can be produced to anti-explosion diesel engine power performance and emission performance, therefore when the blocking of exhaust particulate catcher causes back pressure to reach 25KPa, just need to carry out purifying regeneration to metal foam filtering material, conveniently with prompting driver to the timely regenerative operation of exhaust particulate catcher, the present invention arranges display and alarm system, this system opens diaphragm seal valve automatically by exhaust pressure, ensure the smooth and easy of exhaust, ensure that mining rubber-tired cart normally runs in short-term; Exhaust particulate catcher blocking simultaneously, exhaust back pressure increases, exhaust pressure promotes Pneumatic power diaphragm type adjustable gas control two position four-way valve, pressurized gas in source of the gas gas holder are communicated with indicator, buzzer, pressure indicator, by indicator, pressure indicator, driver observes that exhaust pressure exceeds setting index and buzzer whistling arrow reminds driver to need exhaust particulate catcher regeneration process, after driver rubber-tired cart to correct position, dismounting exhaust particulate catcher carries out regeneration purification.
Compared with prior art, the present invention efficiently decreases the discharge quantity of particulate matter such as anti-explosion diesel engine soot, reduce the pollution of underworkings, simultaneously in order to prevent gas exhaust piping from blocking, the runnability affecting anti-explosion diesel engine increases display and alarm system, reminds driver to carry out passive regeneration to purification plant.
The present invention has following beneficial effect:
1, exhaust particulate purification plant of the present invention adopts particle layering to go forward one by one the mode caught, and substantially increases the purifying ability of mining rubber-tired cart carbon soot particles, effectively reduces exhaust resistance; Adopt the structure of detachable filtering material on chip, every sheet filtering material energy external purification separately, ensure that the cleanliness after the purification of every sheet simultaneously, guarantees that purification its purifying ability long-time is unattenuated; Purifier adopts the mode of multi-disc filtering material combination simultaneously, requirement that can be different to flame proof rubber tyre vehicle smoke emission according to client, the quantity of adjustment filtering material and filtration of material grade, with meeting the market requirement, the cost reducing exhaust particulate purification plant.
2, purifier adopts Fe-Cr-Al(CeO
2) metal foam sheet material, in the formula of existing metal foaming material, add a certain amount of CeO
2chemical composition, it significantly increases material specific surface area, achieves under same volume, and adsorptive power strengthens, and improves the purifying ability of purifier to carbon soot particles in explosion-proof rubber tire tail gas.
3, native system adds safe venting device, under ensureing that purification plant blocks state, does not affect mining rubber-tired cart power performance; After guaranteeing that equipment can move to safety zone, to exhaust particulate purification plant regeneration purification.
4, this device add display and alarm system detect this equipment safety performance, purification plant blocking, exhaust back pressure increase when, have triple display be respectively pressure gauge numerical value display, indicator can intuitively show and buzzer whistling arrow remind.
5, the present invention is rational in infrastructure, and control system is perfect, and versatility is good, and being applicable to diesel engine is all rubber-tired carts and the special vehicle of anti-explosion diesel engine.
Accompanying drawing explanation
Fig. 1 is systemic-function schematic diagram of the present invention;
Fig. 2 is exhaust particulate purification plant schematic diagram of the present invention;
Fig. 3 is safe venting device structural representation;
Fig. 4 is display and alarm system schematic diagram;
Fig. 5 is that exhaust gas flow flows to schematic diagram I;
Fig. 6 is that exhaust gas flow flows to schematic diagram II;
In figure: A-exhaust particulate catcher, 1-pressure test connecting base, 2-outlet pipe, 3-housing, 4-I grade of catcher, 5-II grade of catcher, 6-III grade of catcher, 7-IV grade of catcher, 8-safe venting device, 9-adjustment locking nut, 10-tailpipe, 11-caulking gum, 12-sealed valve body, 13-return spring, 14-valve seat, 15-clamping bolt, 16-tightening nut, 17-loosen packing ring, 18-indicator, 19-buzzer, 20-cuts off and stirs valve, 21-pressure indicator, 22-Pneumatic power diaphragm type control mechanism, 22.1-pneumatic control valve, 22.2-pressurization control cylinder, 23-gas holder.
Embodiment
As Fig. 1, shown in 2, a kind of mining rubber-tired cart exhaust particulate cleaning system, comprise outlet pipe 2 and tailpipe 10, also comprise exhaust particulate purification plant and display and alarm system, described exhaust particulate purification plant comprises safe venting device 8 and is arranged on the exhaust particulate catcher A between outlet pipe 2 and tailpipe 10, described exhaust particulate catcher A comprises the some grades of catchers being arranged on and being arranged in order in housing 3, the catcher of every one-level all adopts somely is fired by Fe-Cr-Al that to form different pore size thickness be that the metal foam sheet of 3-5mm superposes and forms, the decreasing pore size of metal foam sheet in every one-level catcher, exhaust particulate catcher A inside is communicated with the circular hole of hollow, safe venting device 8 is installed on the afterbody of circular hole in exhaust particulate catcher A.
As shown in Figure 4, described display and alarm system comprise the Pneumatic power diaphragm type control mechanism 22 and pressure indicator 21 that are connected with outlet pipe 2, Pneumatic power diaphragm type control mechanism 22 respectively with indicator 18, cut off and stir valve 20 and gas holder 23 is connected, cut off and stir valve 20 and be connected with buzzer 19.
The pressurization control cylinder 22.2 that described Pneumatic power diaphragm type control mechanism 22 comprises pneumatic control valve 22.1 and is connected with outlet pipe 2, the diaphragm spool of pressurization control cylinder 22.2 is connected with the spool of pneumatic control valve 22.1, pneumatic control valve 22.1 is by gas holder 23 air feed, and pneumatic control valve 22.1 is stirred valve 20 with indicator 18 and cut-out respectively and is connected.
As shown in Figure 3, described safe venting device 8 comprises caulking gum 11, sealed valve body 12, return spring 13 and valve seat 14, valve seat 14 installs the afterbody of circular hole in exhaust particulate catcher A housing, valve seat 14 is provided with sealed valve body 12, and between valve seat 14, sealed valve body 12 is provided with return spring 13, and sealed valve body 12 is provided with caulking gum 11.
Exhaust particulate catcher A comprises the metal foam sheet that I grade of catcher, 4, II grade of catcher, 5, III grade of catcher 6 and IV grade of catcher, 7, I grade of catcher 4 are 3mm by 20-30 thickness and forms, and metal foam sheet filter opening diameter is 2800-3000 μm; II grade of catcher 5 is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 2000-2200 μm; III grade of catcher 6 is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 1400-1600 μm; IV grade of catcher 7 is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 450-600 μm.
Display and alarm system are connected with the pressure test connecting base 1 be arranged on outlet pipe 2 by pipeline.
Described exhaust particulate catcher is primarily of laying catcher at different levels and providing the housing 3 installing safe venting device 8 passage, I grade of catcher 4, II grade of catcher 5, III grade of catcher 6, IV grade of catcher 7 and composition such as adjustment locking nut 9 grade, I-IV grade of catcher is made up of respectively filter precision metal foam filtering material from small to large, utilizes adjustment locking nut 9 it to be fasteningly installed in housing 3.Anti-explosion diesel engine exhaust airstream is when by exhaust particulate catcher A, produce inertial collision with catcher at different levels respectively and receive the interception of catcher, larger particles is adsorbed in I grade of catcher 4, medium grain is adsorbed in II grade of catcher 5, in tail gas, particle is successively by the catcher of different accuracy, the layering reaching exhaust particulate is gone forward one by one seizure, realizes tail gas high-efficient purification; Adopt the particle substep of diverse location to catch simultaneously, realize uniform particles and be adsorbed in metal foam filtering material, reduce the smoke emission of mining rubber-tired cart.
Present invention achieves flame proof rubber tyre vehicle in the running of down-hole, occur that exhaust particulate catcher long-time continuous uses, too much sediments, adsorption particle will block catcher, cannot scene carry out regeneration process time, exhaust back pressure reaches 25-30KPa, promote caulking gum 11 and sealed valve body 12, anti-explosion diesel engine tail gas in outlet pipe 2 is flowed directly into tailpipe 10 and enters air by compression retracteding position spring 13, ensure the smooth in exhaust of anti-explosion diesel engine, guarantee flame proof rubber tyre vehicle power performance, after rubber-tired cart can move to home, driver carries out regeneration process to catcher.
Claims (5)
1. a mining rubber-tired cart exhaust particulate cleaning system, comprise outlet pipe (2) and tailpipe (10), it is characterized in that: also comprise exhaust particulate purification plant and display and alarm system, described exhaust particulate purification plant comprises safe venting device (8) and is arranged on the exhaust particulate catcher (A) between outlet pipe (2) and tailpipe (10)
Described exhaust particulate catcher (A) comprises the some grades of catchers being arranged on and being arranged in order in housing (3), the catcher of every one-level all adopts somely is fired by Fe-Cr-Al that to form different pore size thickness be that the metal foam sheet of 3-5mm superposes and forms, the decreasing pore size of metal foam sheet in every one-level catcher, exhaust particulate catcher (A) inside is communicated with the circular hole of hollow, and safe venting device (8) is installed on the afterbody of exhaust particulate catcher (A) interior circular hole;
Described display and alarm system comprise the Pneumatic power diaphragm type control mechanism (22) and pressure indicator (21) that are connected with outlet pipe (2), Pneumatic power diaphragm type control mechanism (22) respectively with indicator (18), cut off and stir valve (20) and gas holder (23) is connected, cut off and stir valve (20) and be connected with buzzer (19).
2. mining rubber-tired cart exhaust particulate cleaning system according to claim 1, it is characterized in that: the pressurization control cylinder (22.2) that described Pneumatic power diaphragm type control mechanism (22) comprises pneumatic control valve (22.1) and is connected with outlet pipe (2), the diaphragm spool of pressurization control cylinder (22.2) is connected with the spool of pneumatic control valve (22.1), pneumatic control valve (22.1) is by gas holder (23) air feed, and pneumatic control valve (22.1) is stirred valve (20) with indicator (18) and cut-out respectively and is connected.
3. mining rubber-tired cart exhaust particulate cleaning system according to claim 2, it is characterized in that: described safe venting device (8) comprises caulking gum (11), sealed valve body (12), return spring (13) and valve seat (14), valve seat (14) installs the afterbody of circular hole in exhaust particulate catcher (A) housing, valve seat (14) is provided with sealed valve body (12), between valve seat (14), sealed valve body (12) is provided with return spring (13), and sealed valve body (12) is provided with caulking gum (11).
4. the mining rubber-tired cart exhaust particulate cleaning system according to claim 1 or 3, it is characterized in that: exhaust particulate catcher (A) comprises I grade of catcher (4), II grade of catcher (5), III grade of catcher (6) and IV grade of catcher (7), the metal foam sheet that I grade of catcher (4) is 3mm by 20-30 thickness forms, and metal foam sheet filter opening diameter is 2800-3000 μm; II grade of catcher (5) is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 2000-2200 μm; III grade of catcher (6) is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 1400-1600 μm; IV grade of catcher (7) is that 3mm metal foam sheet forms by 20-30 thickness, and metal foam sheet is considered bore dia and is 450-600 μm.
5. mining rubber-tired cart exhaust particulate cleaning system according to claim 2, is characterized in that: display and alarm system are connected with the pressure test connecting base (1) be arranged on outlet pipe (2) by pipeline.
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| CN107237661A (en) * | 2017-07-31 | 2017-10-10 | 无锡双翼汽车环保科技有限公司 | Anti-explosion diesel engine for mine soot filters |
| CN107237671A (en) * | 2017-07-31 | 2017-10-10 | 无锡双翼汽车环保科技有限公司 | Anti-explosion diesel engine for mine tail gas catalyzing unit |
| CN107339131A (en) * | 2017-02-14 | 2017-11-10 | 合肥宝发动力技术有限公司 | A kind of safety valve DPF clarifiers |
| CN109707486A (en) * | 2019-02-12 | 2019-05-03 | 合肥宝发动力技术有限公司 | Motor exhaust after-treatment device based on DPF/GPF bimodal technology |
| CN110617123A (en) * | 2019-10-10 | 2019-12-27 | 徐州瑞田工程机械有限公司 | Diesel engine tail gas particulate matter trapping apparatus |
| CN110751749A (en) * | 2019-09-18 | 2020-02-04 | 中国第一汽车股份有限公司 | GPF ice blockage alarm prompting method, system, device and storage medium |
| CN111120048A (en) * | 2019-11-27 | 2020-05-08 | 西安戴森电子技术有限公司 | Graphene diesel engine tail gas purification device |
| CN113848080A (en) * | 2021-09-28 | 2021-12-28 | 山东科技大学 | Simulation experiment system and method for diffusion and distribution of tail gas pollutants of trackless rubber-tyred vehicle |
| CN115030799A (en) * | 2022-07-07 | 2022-09-09 | 中国煤炭科工集团太原研究院有限公司 | Intelligent efficient composite regenerated particle trapping device in low exhaust temperature environment for mine |
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| CN113848080B (en) * | 2021-09-28 | 2023-07-18 | 山东科技大学 | Simulation experiment system and method for tail gas pollutant diffusion and distribution of trackless rubber-tyred vehicle |
| CN113848080A (en) * | 2021-09-28 | 2021-12-28 | 山东科技大学 | Simulation experiment system and method for diffusion and distribution of tail gas pollutants of trackless rubber-tyred vehicle |
| CN115030799A (en) * | 2022-07-07 | 2022-09-09 | 中国煤炭科工集团太原研究院有限公司 | Intelligent efficient composite regenerated particle trapping device in low exhaust temperature environment for mine |
| CN115030799B (en) * | 2022-07-07 | 2024-05-17 | 中国煤炭科工集团太原研究院有限公司 | Intelligent efficient composite regeneration particle trapping device in mining low-exhaust-temperature environment |
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