Practice report of pumping station in Hefei mining machinery wor
Publish: 2021-05-16 23:57:34
1. Minji Ercun community is located in Mingguang Road, Yaohai, Hefei City, with a total of 440 houses.
2. Practice summary of Laigang
the training in Laigang is coming to an end. Now I will make a systematic summary of my study in the past three months. This paper mainly introces the following key contents: brief introction of sintering workshop, start-up scheme of sintering workshop, maintenance start-up and stop operation, analysis and treatment of typical and common accidents, main contents of pyrotechnics and other posts, new sintering process, etc<
I. Introction of sintering workshop
Fig. 1 shows the whole picture of sintering workshop
Fig. 1 sintering proction is a process of exhaust sintering, that is, mixing ore, flux, fuel, st ash and return ore according to a certain proportion, adding appropriate amount of water, mixing and pelleting by mixer, laying on sintering trolley, and igniting under a certain negative pressure, The whole sintering process is carried out from top to bottom under 9.8-17.0 kPa negative pressure
the sintering workshop includes mixing system, cooling system, main exhaust system, fuel crushing system, finished proct screening system, st removal and bulk material system, etc. Laiwu Steel 265m2 sintering machine is a 3200m-179; Supporting system of new blast furnace. The designed utilization coefficient is 1.25 T / h.m2, the calendar operation rate of equipment is 92%, and the annual output of high basicity sinter is 4.3821 million tons. The main equipment is 148 pieces of 5 × one point five × 72m single trolley, 520 M2 annular cooling trolley (equipped with 5 fans for sectional air blowing), 2 mixers, 2 sets of North-South screening systems (the screen mesh is divided into 5, 10 and 20mm levels), etc<
Fig. 2 sintering process
Fig. 2, sintering process introction: proportioning (blending ore + fuel + quicklime dolomite + st ash + return ore) → primary mixer (blending) → secondary mixer (pelletizing) → mixing silo, Bedding material (10-20 mm) → sintering trolley → negative pressure ignition sintering (2 rows of 27 burners in total) → look around cooler (speed ratio to trolley is 1.25) → plate feeder (made of steel plate to prevent grinding damage and prolong service life) → screening system (one screen 20 mm, two screens 5 mm, three screens 10 mm) → to blast furnace slow storage through Z8< Second, sintering workshop start-up plan
first of all, preparation must be made before start-up. Personnel (commander and operator) must be in place; Safety (gas and fire fighting, etc.) must be qualified; Energy supply (water, electricity, gas and raw materials) must be stable and reliable< After the preparation work is completed, the start-up is divided into four steps:
I) single equipment commissioning: through clearance operation and continuous operation, check whether the single equipment can achieve all the functions required by the design under no-load
2) equipment linkage test run: it can be divided into single linkage test run and large linkage test run. The purpose is to assess the linkage requirements required by equipment proction and ensure the reliability and safety of equipment operation< (3) cold load test: at this time, there is no need to ignite and sinter, just check whether the material flow is smooth in the main process, and test the total processing time of the whole process. Let the material fill the chute and funnel of each part to form a dead material protective layer. The reliability of equipment, program and interlock is further tested by cold continuous operation. And can adjust the parameters of equipment and instrument< (4) thermal load test run: the test run is prepared for formal proction, including whether the fuel crushing system can supply qualified fuel in time and meet the process requirements, the accuracy of batching scale and water meter of mixing system, the igniter effect of sintering cooling system, the adjustment of thermal expansion gap and process parameters of trolley, and the smoothness of finished proct screening system
since there is no bedding material in the new workshop, it is necessary to start without bedding material. At this time, it is very easy to stick to the trolley accident. The key points of preventing sticking to the trolley are as follows: 1. The sintering machine material layer should be controlled at 650-700mm, and the pressing operation should not be carried out. 2. Properly rece the fuel ratio (coal ratio reced by 0.2-0.4). 3. The nine roller speed should be reced to prevent the large particle fuel from reaching the bottom of the bed. 4. The sintering end point is controlled at the last air box of the tail, and there is 10-20 mm raw material in the tail section. 5. A special person shall be assigned at the tail of the machine to deal with the sticky material found on the trolley in time (cold water can be applied to the castor bar of the second floor trolley, and the trolley can be vibrated). 6. Ensure the normal operation of the five blowers< During the three-month internship, I have experienced two overhauls (one is the planned overhaul on September 25, and the other is the unplanned overhaul on October 24). The shutdown operation and overhaul key points are summarized as follows:
shutdown: 1. Inform the raw materials in advance to cut off, central control to stop the batching system (emergency stop type), and the 1H-1 belt will stop automatically when the material is empty. 2. Stop mixing system (forward stop type), primary mixer, 2h-1 belt, secondary mixer and Z4 belt stop with empty material in turn, the whole process is about 25 minutes. When parking, a special person should be assigned here to pay close attention to the moisture change in the mixer and adjust the water addition in time. And for the convenience of maintenance and cleaning after stopping, the belt to be replaced and the mixer to be cleaned should be stopped at the designated position. 3. Because the mixing bin is not feeding at this time, the material level of the bin will slowly decrease. Depending on the material level of the mixing bin, graally rece the machine speed so that the material can be spread over the trolley and the mixing bin can be emptied. 4. After the mixture bin is emptied, stop the nine rollers and round rollers, and turn off the gas after the charging trolley goes out of the ignition furnace (first, the central control adjusts the small gas valve, and then the ball valve and pull rod valve are closed on site in turn, the central control closes the gas shut-off valve and regulating valve, opens the gas pipe end to release, carries out nitrogen purging, and turns off the gas eye valve to seal the gas). 5. Turn off the flap valve of the lower air box of the trolley in turn with the unloading trolley. At this time, the mixing system can be opened to enter the mixing bin, and the return ore can be used as a stepping stone to clean the upper part of the bin, so as to ensure the safety of personnel and prevent falling down the bottom of the bin. 6. When the trolley is empty, the sintering machine and the annular cooler stop the sintering trolley without linkage, and open the cooling air valve to cool the trolley, so as to achieve the purpose of cooling and rapid maintenance of the trolley. 7. Stop the ring cooler after the feed passes through the ring cooler, and stop the blower after more than ten minutes. 8. Stop the screening system after the screening of sinter. The on-site personnel set the switch on the operation post to the zero position. 9. Shut down the water pump, st removal and main exhaust fan after the air valve is opened to the minimum (12%) for one hour. 10. When the power is cut off and the maintenance is carried out, the lighting voltage used for maintenance must be safety voltage. The parking is finished
the main contents of maintenance are: 1. Replace the idler, replace the belt; 2. Clean the mixer and mixing bin; 3. Change the trolley and arrange the castor strips; 4. Maintain the fan and finished proct equipment
driving: 1. Inform the on-site personnel to prepare for driving and pay attention to safety. 2. When the power is on, the operator will turn the switch to the automatic position. 3. Start the water pump. 4. Start the main exhaust fan (two fans are started at intervals of about 20 minutes, and the damper is fully closed when starting). 5. Start ignition fan and combustion fan. 6. Nitrogen cleaning, gas introction and blasting experiment (see Annex 1 for details). After qualified, ignite the ignition burners on both sides. 7. Start the ring cooling blower (when starting, the damper is fully closed, and 5 sets are started one by one), and start the st removal system. 8. Start the finished proct screening system. 9. Open bulk material system. 10. Set the ratio, moisture content, machine speed and other process parameters to start mixing. 11. Add water according to the situation of the material into the mixer to prevent wet material and dry material. 12. When the material level in the mixing bin reaches 20-30, open the round roller, nine roller, bedding material and mixture, and drive the sintering trolley (the machine speed starts to slow down about 1.5m / min). 13. Synchronize with 12 to ignite the main burner. The gas and air flow increases slowly, and the air coal ratio is 4.7. 14. Pneumatic ash conveying system. The fuel crushing system is a separate part, depending on the level of fuel bunker. So far, the driving is over< 4. Analysis and treatment of typical and common accidents
1. Change the trolley
1. If the pyrotechnics find that the trolley wheel is damaged, the trolley baffle or heat insulation pad is damaged, and the trolley must be replaced, the workshop, central control and maintenance personnel shall be informed immediately. 2. Determine the number of the broken trolley at the head and tail of the machine. 3. When the crown block is in place, the spare trolley and necessary tools shall be prepared and placed at the rear of the machine. 4. When the trolley needs to be changed to pass through the round roller distributor, stop the round roller so that the trolley needs to be changed and the front and rear half of the trolley does not distribute. 5. By speeding up the speed or recing the comprehensive feeding amount in advance, the material level of the mixing bin is controlled at the low limit. 6. When the car needs to be changed out of the ignition furnace, close and open the flap valve of the bellows in turn to rece air leakage. 7. When the truck needs to be changed and it is close to the 21 ° bellows, the mixing system shall be stopped in advance. As far as possible, the mixing silo shall be discharged to prevent material sticking. 8. Stop at the left and right of 22 ° bellows and close several bellows flap valves nearby. 9. At the same time, the gas volume should be reced, as long as the fire can burn. 10. The crane hoists the broken trolley away (at this time, the castor bar is needed to block the wheels of the front and rear trolley) and replaces it with the standby trolley. 11. Turn up gas, start mixing, roll and trolley
2. Replace the castor bar
1. When it is found at the head and tail of the initiating explosive device or judged by the central control through the computer screen, confirm on site. 2. Prepare new castor strips and put them on the machine head. 3. Because it takes 100 minutes for the trolley to turn around, confirm the number of the trolley first, wait for it to turn to the head, stop the trolley, turn down the gas, and rece the total feeding amount a few minutes in advance. 4. Pull out the pressing block and plug of castor bar, and install the castor bar again. 5. Start up, turn on the gas, and the feeding quantity returns to normal
3. Red run material treatment
Red run material refers to the situation that the material is not fully burned on the sintering trolley and continues to burn when it falls onto the annular cooler (out of the annular cooling flue gas hood). At this time, 1. The speed of the circular cooler should be reced appropriately to make the sinter get more cooling time, but the ratio of the speed of the circular cooler to the speed of the trolley should not be less than 1.25. The speed of annular cooler should not be lower than 200R / min. 2. Turn on the tap at the curved rail to draw water for the material layer of the ring cooling car, and pay attention to the amount of water, because too much water will have a negative impact on the sinter pulverization performance. 3. Adjust the speed of plate feeder properly to prevent red ore from burning Z3 belt. 4. When there is still red material, you can also draw water on Z3. 5. At this time, the return ore will increase, so it is necessary to prevent the return ore fluctuation from affecting the second round fluctuation. 6. Analyze and summarize the cause of the accident in time
4. Wet material handling of the primary mixer
1. Turn off the water adding switch of the secondary mixer immediately. 2. Find out the reason and adjust the moisture rate setting value in time to ensure the moisture stability. 3. The tail of 2h-1 machine is marked to prevent the belt from pressing material e to excessive moisture. 4. According to the wet material time to rece the amount of comprehensive feeding, the longer the time, the greater the range. 5. Speed up the sintering trolley appropriately, control the lower limit of the material level of the mixing bin as far as possible, and prevent the wet material from entering the bin. 6. Bottom layer sintering. 7. The unloading level should also be kept low to prevent material sticking. 8. Wet material can't be put into the bedding material to prevent adhesion
5. Belt deviation adjustment
when belt deviation occurs, after the belt contacts the deviation detector, the deviation of the contact roller of the deviation detector reaches 30% °， The micro switch in the detector acts to stop the belt conveyor in linkage operation. 1. Generally, the head pulley is not adjusted when the belt deviates. When the belt deviates at the tail, the tail pulley is adjusted according to the forward direction of the belt. 2. When the belt deviates from the outer side of the upper idler, the upper idler frame moves according to the belt forward direction (the standing side is the inner side). 3. When the belt deviates from the outer side of the upper idler, the upper idler shall be adjusted in the opposite direction of the forward direction. 4. When the belt is too thin or stretched and deviates, adjust the tensioning device. 5. Due to improper cementation, re cementation is needed
6. Operation in case of coal breaking
1. Find out the reasons in time, such as the weighing belt slipping, no feeding, blanking funnel blocked, and deal with and adjust in time. 2. When the material is ready to leave the ring cooler, the comprehensive feeding amount is greatly reced. 3. When the plate feeder is discharged, the sintering rate is greatly reced
the training in Laigang is coming to an end. Now I will make a systematic summary of my study in the past three months. This paper mainly introces the following key contents: brief introction of sintering workshop, start-up scheme of sintering workshop, maintenance start-up and stop operation, analysis and treatment of typical and common accidents, main contents of pyrotechnics and other posts, new sintering process, etc<
I. Introction of sintering workshop
Fig. 1 shows the whole picture of sintering workshop
Fig. 1 sintering proction is a process of exhaust sintering, that is, mixing ore, flux, fuel, st ash and return ore according to a certain proportion, adding appropriate amount of water, mixing and pelleting by mixer, laying on sintering trolley, and igniting under a certain negative pressure, The whole sintering process is carried out from top to bottom under 9.8-17.0 kPa negative pressure
the sintering workshop includes mixing system, cooling system, main exhaust system, fuel crushing system, finished proct screening system, st removal and bulk material system, etc. Laiwu Steel 265m2 sintering machine is a 3200m-179; Supporting system of new blast furnace. The designed utilization coefficient is 1.25 T / h.m2, the calendar operation rate of equipment is 92%, and the annual output of high basicity sinter is 4.3821 million tons. The main equipment is 148 pieces of 5 × one point five × 72m single trolley, 520 M2 annular cooling trolley (equipped with 5 fans for sectional air blowing), 2 mixers, 2 sets of North-South screening systems (the screen mesh is divided into 5, 10 and 20mm levels), etc<
Fig. 2 sintering process
Fig. 2, sintering process introction: proportioning (blending ore + fuel + quicklime dolomite + st ash + return ore) → primary mixer (blending) → secondary mixer (pelletizing) → mixing silo, Bedding material (10-20 mm) → sintering trolley → negative pressure ignition sintering (2 rows of 27 burners in total) → look around cooler (speed ratio to trolley is 1.25) → plate feeder (made of steel plate to prevent grinding damage and prolong service life) → screening system (one screen 20 mm, two screens 5 mm, three screens 10 mm) → to blast furnace slow storage through Z8< Second, sintering workshop start-up plan
first of all, preparation must be made before start-up. Personnel (commander and operator) must be in place; Safety (gas and fire fighting, etc.) must be qualified; Energy supply (water, electricity, gas and raw materials) must be stable and reliable< After the preparation work is completed, the start-up is divided into four steps:
I) single equipment commissioning: through clearance operation and continuous operation, check whether the single equipment can achieve all the functions required by the design under no-load
2) equipment linkage test run: it can be divided into single linkage test run and large linkage test run. The purpose is to assess the linkage requirements required by equipment proction and ensure the reliability and safety of equipment operation< (3) cold load test: at this time, there is no need to ignite and sinter, just check whether the material flow is smooth in the main process, and test the total processing time of the whole process. Let the material fill the chute and funnel of each part to form a dead material protective layer. The reliability of equipment, program and interlock is further tested by cold continuous operation. And can adjust the parameters of equipment and instrument< (4) thermal load test run: the test run is prepared for formal proction, including whether the fuel crushing system can supply qualified fuel in time and meet the process requirements, the accuracy of batching scale and water meter of mixing system, the igniter effect of sintering cooling system, the adjustment of thermal expansion gap and process parameters of trolley, and the smoothness of finished proct screening system
since there is no bedding material in the new workshop, it is necessary to start without bedding material. At this time, it is very easy to stick to the trolley accident. The key points of preventing sticking to the trolley are as follows: 1. The sintering machine material layer should be controlled at 650-700mm, and the pressing operation should not be carried out. 2. Properly rece the fuel ratio (coal ratio reced by 0.2-0.4). 3. The nine roller speed should be reced to prevent the large particle fuel from reaching the bottom of the bed. 4. The sintering end point is controlled at the last air box of the tail, and there is 10-20 mm raw material in the tail section. 5. A special person shall be assigned at the tail of the machine to deal with the sticky material found on the trolley in time (cold water can be applied to the castor bar of the second floor trolley, and the trolley can be vibrated). 6. Ensure the normal operation of the five blowers< During the three-month internship, I have experienced two overhauls (one is the planned overhaul on September 25, and the other is the unplanned overhaul on October 24). The shutdown operation and overhaul key points are summarized as follows:
shutdown: 1. Inform the raw materials in advance to cut off, central control to stop the batching system (emergency stop type), and the 1H-1 belt will stop automatically when the material is empty. 2. Stop mixing system (forward stop type), primary mixer, 2h-1 belt, secondary mixer and Z4 belt stop with empty material in turn, the whole process is about 25 minutes. When parking, a special person should be assigned here to pay close attention to the moisture change in the mixer and adjust the water addition in time. And for the convenience of maintenance and cleaning after stopping, the belt to be replaced and the mixer to be cleaned should be stopped at the designated position. 3. Because the mixing bin is not feeding at this time, the material level of the bin will slowly decrease. Depending on the material level of the mixing bin, graally rece the machine speed so that the material can be spread over the trolley and the mixing bin can be emptied. 4. After the mixture bin is emptied, stop the nine rollers and round rollers, and turn off the gas after the charging trolley goes out of the ignition furnace (first, the central control adjusts the small gas valve, and then the ball valve and pull rod valve are closed on site in turn, the central control closes the gas shut-off valve and regulating valve, opens the gas pipe end to release, carries out nitrogen purging, and turns off the gas eye valve to seal the gas). 5. Turn off the flap valve of the lower air box of the trolley in turn with the unloading trolley. At this time, the mixing system can be opened to enter the mixing bin, and the return ore can be used as a stepping stone to clean the upper part of the bin, so as to ensure the safety of personnel and prevent falling down the bottom of the bin. 6. When the trolley is empty, the sintering machine and the annular cooler stop the sintering trolley without linkage, and open the cooling air valve to cool the trolley, so as to achieve the purpose of cooling and rapid maintenance of the trolley. 7. Stop the ring cooler after the feed passes through the ring cooler, and stop the blower after more than ten minutes. 8. Stop the screening system after the screening of sinter. The on-site personnel set the switch on the operation post to the zero position. 9. Shut down the water pump, st removal and main exhaust fan after the air valve is opened to the minimum (12%) for one hour. 10. When the power is cut off and the maintenance is carried out, the lighting voltage used for maintenance must be safety voltage. The parking is finished
the main contents of maintenance are: 1. Replace the idler, replace the belt; 2. Clean the mixer and mixing bin; 3. Change the trolley and arrange the castor strips; 4. Maintain the fan and finished proct equipment
driving: 1. Inform the on-site personnel to prepare for driving and pay attention to safety. 2. When the power is on, the operator will turn the switch to the automatic position. 3. Start the water pump. 4. Start the main exhaust fan (two fans are started at intervals of about 20 minutes, and the damper is fully closed when starting). 5. Start ignition fan and combustion fan. 6. Nitrogen cleaning, gas introction and blasting experiment (see Annex 1 for details). After qualified, ignite the ignition burners on both sides. 7. Start the ring cooling blower (when starting, the damper is fully closed, and 5 sets are started one by one), and start the st removal system. 8. Start the finished proct screening system. 9. Open bulk material system. 10. Set the ratio, moisture content, machine speed and other process parameters to start mixing. 11. Add water according to the situation of the material into the mixer to prevent wet material and dry material. 12. When the material level in the mixing bin reaches 20-30, open the round roller, nine roller, bedding material and mixture, and drive the sintering trolley (the machine speed starts to slow down about 1.5m / min). 13. Synchronize with 12 to ignite the main burner. The gas and air flow increases slowly, and the air coal ratio is 4.7. 14. Pneumatic ash conveying system. The fuel crushing system is a separate part, depending on the level of fuel bunker. So far, the driving is over< 4. Analysis and treatment of typical and common accidents
1. Change the trolley
1. If the pyrotechnics find that the trolley wheel is damaged, the trolley baffle or heat insulation pad is damaged, and the trolley must be replaced, the workshop, central control and maintenance personnel shall be informed immediately. 2. Determine the number of the broken trolley at the head and tail of the machine. 3. When the crown block is in place, the spare trolley and necessary tools shall be prepared and placed at the rear of the machine. 4. When the trolley needs to be changed to pass through the round roller distributor, stop the round roller so that the trolley needs to be changed and the front and rear half of the trolley does not distribute. 5. By speeding up the speed or recing the comprehensive feeding amount in advance, the material level of the mixing bin is controlled at the low limit. 6. When the car needs to be changed out of the ignition furnace, close and open the flap valve of the bellows in turn to rece air leakage. 7. When the truck needs to be changed and it is close to the 21 ° bellows, the mixing system shall be stopped in advance. As far as possible, the mixing silo shall be discharged to prevent material sticking. 8. Stop at the left and right of 22 ° bellows and close several bellows flap valves nearby. 9. At the same time, the gas volume should be reced, as long as the fire can burn. 10. The crane hoists the broken trolley away (at this time, the castor bar is needed to block the wheels of the front and rear trolley) and replaces it with the standby trolley. 11. Turn up gas, start mixing, roll and trolley
2. Replace the castor bar
1. When it is found at the head and tail of the initiating explosive device or judged by the central control through the computer screen, confirm on site. 2. Prepare new castor strips and put them on the machine head. 3. Because it takes 100 minutes for the trolley to turn around, confirm the number of the trolley first, wait for it to turn to the head, stop the trolley, turn down the gas, and rece the total feeding amount a few minutes in advance. 4. Pull out the pressing block and plug of castor bar, and install the castor bar again. 5. Start up, turn on the gas, and the feeding quantity returns to normal
3. Red run material treatment
Red run material refers to the situation that the material is not fully burned on the sintering trolley and continues to burn when it falls onto the annular cooler (out of the annular cooling flue gas hood). At this time, 1. The speed of the circular cooler should be reced appropriately to make the sinter get more cooling time, but the ratio of the speed of the circular cooler to the speed of the trolley should not be less than 1.25. The speed of annular cooler should not be lower than 200R / min. 2. Turn on the tap at the curved rail to draw water for the material layer of the ring cooling car, and pay attention to the amount of water, because too much water will have a negative impact on the sinter pulverization performance. 3. Adjust the speed of plate feeder properly to prevent red ore from burning Z3 belt. 4. When there is still red material, you can also draw water on Z3. 5. At this time, the return ore will increase, so it is necessary to prevent the return ore fluctuation from affecting the second round fluctuation. 6. Analyze and summarize the cause of the accident in time
4. Wet material handling of the primary mixer
1. Turn off the water adding switch of the secondary mixer immediately. 2. Find out the reason and adjust the moisture rate setting value in time to ensure the moisture stability. 3. The tail of 2h-1 machine is marked to prevent the belt from pressing material e to excessive moisture. 4. According to the wet material time to rece the amount of comprehensive feeding, the longer the time, the greater the range. 5. Speed up the sintering trolley appropriately, control the lower limit of the material level of the mixing bin as far as possible, and prevent the wet material from entering the bin. 6. Bottom layer sintering. 7. The unloading level should also be kept low to prevent material sticking. 8. Wet material can't be put into the bedding material to prevent adhesion
5. Belt deviation adjustment
when belt deviation occurs, after the belt contacts the deviation detector, the deviation of the contact roller of the deviation detector reaches 30% °， The micro switch in the detector acts to stop the belt conveyor in linkage operation. 1. Generally, the head pulley is not adjusted when the belt deviates. When the belt deviates at the tail, the tail pulley is adjusted according to the forward direction of the belt. 2. When the belt deviates from the outer side of the upper idler, the upper idler frame moves according to the belt forward direction (the standing side is the inner side). 3. When the belt deviates from the outer side of the upper idler, the upper idler shall be adjusted in the opposite direction of the forward direction. 4. When the belt is too thin or stretched and deviates, adjust the tensioning device. 5. Due to improper cementation, re cementation is needed
6. Operation in case of coal breaking
1. Find out the reasons in time, such as the weighing belt slipping, no feeding, blanking funnel blocked, and deal with and adjust in time. 2. When the material is ready to leave the ring cooler, the comprehensive feeding amount is greatly reced. 3. When the plate feeder is discharged, the sintering rate is greatly reced
3. 1 Jianghuai heavy instry base is located at No.1 Taihu Road, Hefei, Anhui Province
[2] Anhui Jianghuai UnionPay Heavy Construction Machinery Co., Ltd. (hereinafter referred to as JAC heavy instry) is a holding subsidiary of Anhui Jianghuai Automobile Group Co., Ltd. (hereinafter referred to as JAC group), a large domestic automobile group company. The company specializes in the development and proction of forklift trucks, excavators and other construction machinery.
[2] Anhui Jianghuai UnionPay Heavy Construction Machinery Co., Ltd. (hereinafter referred to as JAC heavy instry) is a holding subsidiary of Anhui Jianghuai Automobile Group Co., Ltd. (hereinafter referred to as JAC group), a large domestic automobile group company. The company specializes in the development and proction of forklift trucks, excavators and other construction machinery.
4. Shandong mining machinery, they can help you, technology is very mature, practical! You can also look at their proct brochures
5. March 1974 to November 1976: ecated youth in Changgang commune of Feixi County; From November 1976 to December 1979, he was the director of the security section of Hefei mining machinery factory; December 1979 to March 1984, the police of the criminal police team of Dongshi Branch of Hefei public security bureau; From March 1984 to September 1985, he served as the vice captain of the criminal police team of Dongshi Branch of Hefei public security bureau; September 1985 to July 1987, majored in law, Anhui University; From July 1987 to June 1991, he served as deputy captain of the criminal police team of Dongshi Branch of Hefei public security bureau; From June 1991 to June 1992, he served as the captain of the criminal police team of Dongshi Branch of Hefei public security bureau; From June 1992 to December 1993, he served as the captain and deputy section level inspector of the criminal police team of Dongshi Branch of Hefei public security bureau; From December 1993 to November 1995, he served as deputy political commissar of Dongshi Branch of Hefei public security bureau; From November 1995 to November 1998, he served as director of Dongshi Branch of Hefei public security bureau; From November 1998 to December 1998, he served as director and Assistant Investigator of Dongshi Branch of Hefei public security bureau; From December 1998 to June 1999, he served as assistant director, Assistant Investigator and member of the Party committee of Hefei public security bureau; From June 1999 to May 2003, he served as deputy director and member of the Party committee of Hefei public security bureau (from August 1999 to December 2002, he took part in the correspondence law major of the Party School of the provincial Party committee and obtained a university degree); From May 2003 to November 2004, he served as deputy director and Deputy Secretary of the Party committee of Hefei public security bureau; From November 2004 to November 2007, he served as deputy director of Hefei public security bureau and Deputy Secretary of the Party committee (department level); From November 2007 to April 2008, he served as director of Xuancheng Public Security Bureau and Secretary of the Party committee; From April 2008 to September 2008, he was a member of the political and Legal Committee of Xuancheng municipal Party committee, director of the Municipal Public Security Bureau and Secretary of the Party committee; From September 2008 to September 2011, he served as a member of the political and Legal Committee of Xuancheng municipal Party committee, director of the Municipal Public Security Bureau and Secretary of the Party committee (deputy mayor level); From September 2011 to December 2011, he served as member of Xuancheng municipal Party committee, member of political and Legal Committee of Xuancheng municipal Party committee, director of Xuancheng Municipal Public Security Bureau (deputy mayor level) and Secretary of the Party committee; From December 2011 to may 2014, he served as member of Xuancheng municipal Party committee, member of political and Legal Committee of Xuancheng municipal Party committee, vice mayor of Xuancheng Municipal People's government, director of Xuancheng Public Security Bureau and Secretary of Xuancheng Party committee. May 2014 deputy inspector of Anhui Provincial Public Security Department.
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