Taikuang shearer hydraulic lock
Publish: 2021-04-27 19:08:18
1. Executive standard: Q / JM 0201021-2010; MT/T81-1998; MT / t82-1998 Manual of Jixi Coal mining Machinery Co., Ltd. in May 2010
MG200 / 530 – WD MG250 / 630 – WD AC haulage shearer MG300 / 730 – WD MG300 / 730 – wd1
MG200 / 530 – WD MG250 / 630 – WD AC haulage shearer MG300 / 730 – WD MG300 / 730 – wd1
2. If the shearer can't be adjusted up or down, it must be caused by its lack of pressure or hydraulic pipe line.
3. Unknown_Error
4. Maiju online coal machine parts purchasing platform aims to become an excellent one-stop purchasing supermarket for coal mine equipment parts. The mall gathers many excellent coal mine equipment, mainly including Jixi coal mining machine parts, mining roadheader parts, taikuang coal mining machine parts, scraper machine parts, hydraulic parts and other accessories around the coal mining machine
Jixi coal machine accessories include 10mJ, 12mj, 14mj, 15mj, 18mJ, 19mj, 20mj, 22mj, 23mj, 24mj, 26mj, 30MJ, 31mj, 32mj, 33mj, 34mj and other types of accessories. Including Jixi shearer hydraulic support, hydraulic nut, hydraulic lock, hydraulic control valve group, walking wheel, driving wheel, torque shaft, inner gear ring
, hydraulic brake, planetary carrier, shaft gear, sun gear, guide slipper, drum connecting plate, cooler,
planetary gear
, gear, heightening cylinder A.
type B
, planetary mechanism, planetary recer, One axis, two axis, three axis, four axis, five axis and other vulnerable parts. Shearer rocker arm, left and right traveling part, left and right traveling box, shearer shell, left and right cutting part, electric control part, left and right traction part, shearer drum and other large parts
Jixi coal machine accessories include 10mJ, 12mj, 14mj, 15mj, 18mJ, 19mj, 20mj, 22mj, 23mj, 24mj, 26mj, 30MJ, 31mj, 32mj, 33mj, 34mj and other types of accessories. Including Jixi shearer hydraulic support, hydraulic nut, hydraulic lock, hydraulic control valve group, walking wheel, driving wheel, torque shaft, inner gear ring
, hydraulic brake, planetary carrier, shaft gear, sun gear, guide slipper, drum connecting plate, cooler,
planetary gear
, gear, heightening cylinder A.
type B
, planetary mechanism, planetary recer, One axis, two axis, three axis, four axis, five axis and other vulnerable parts. Shearer rocker arm, left and right traveling part, left and right traveling box, shearer shell, left and right cutting part, electric control part, left and right traction part, shearer drum and other large parts
5. First of all, consider whether the pipeline is blocked or leaking oil. This is a good way to check whether the oil outlet is blocked to see if the pressure changes
secondly, check whether the gear pump is worn seriously. If the gear pump is worn seriously, it can not supply oil to the oil cylinder or the oil supply pressure is not enough
again, check whether the hydraulic lock of the oil cylinder can not seal oil
it may be the first two problems that the left and right valves are not raised, or it may be the problem of
multi way directional valve.
secondly, check whether the gear pump is worn seriously. If the gear pump is worn seriously, it can not supply oil to the oil cylinder or the oil supply pressure is not enough
again, check whether the hydraulic lock of the oil cylinder can not seal oil
it may be the first two problems that the left and right valves are not raised, or it may be the problem of
multi way directional valve.
6. First of all, consider whether the pipeline is blocked or leaking oil. This is a good way to check whether the oil outlet is blocked to see if the pressure changes
secondly, check whether the gear pump is seriously worn. If the gear pump is seriously worn, it is unable to supply oil to the oil cylinder, or the supply pressure is not enough
again, check whether the hydraulic lock of the oil cylinder can not seal oil
it may be the first two problems that the left and right are not adjusted high, or it may be the problem of the multi way directional valve
these are the common problems. You can check them first
in addition, you need to explain whether it's manual or electric. If it's electric, there may be something wrong with the solenoid valve
secondly, check whether the gear pump is seriously worn. If the gear pump is seriously worn, it is unable to supply oil to the oil cylinder, or the supply pressure is not enough
again, check whether the hydraulic lock of the oil cylinder can not seal oil
it may be the first two problems that the left and right are not adjusted high, or it may be the problem of the multi way directional valve
these are the common problems. You can check them first
in addition, you need to explain whether it's manual or electric. If it's electric, there may be something wrong with the solenoid valve
7. At present, most of the shearers used in our country are still hydraulic haulage shearers, electric haulage shearers are still in the primary stage, the utilization rate is not high, and most of the faults of shearers occur in the hydraulic system of the haulage department. In order to correctly judge and eliminate the fault in time, the characteristics of hydraulic transmission of hydraulic haulage coal machine are introced in the following list< (1) in the hydraulic transmission system, the pressure is affected by the working load. When the working resistance is large, the pressure in the hydraulic system is large, and the pressure loss and leakage also increase
(2) the hydraulic transmission system is mainly connected by pipelines and uses hydraulic oil to transmit power, so pipeline leakage will seriously affect the performance of the system
(3) the working medium of hydraulic transmission system is hydraulic oil, and the change of oil temperature has a great influence on the system. The change of oil temperature directly affects the viscosity
(4) hydraulic components have high manufacturing accuracy and small clearance, most of which are clearance fit, especially the main components such as hydraulic pump and hydraulic motor, which not only have good sealing and flexible action, but also use oil film to rece metal friction. This requires that there should be no moisture, air and mechanical impurities in the hydraulic oil, otherwise the components will be worn and stuck
(5) the hydraulic system of the shearer is equipped with a variety of protections, so the setting value in the system must be accurate and reliable, otherwise the performance of the shearer will be affected< The hydraulic system of shearer is divided into two parts: high pressure and low pressure. The high voltage increases with the increase of load, the low voltage is constant, and the increase or decrease of load has no effect on the low voltage
1. The low pressure is normal, but the high pressure decreases
when the load increases, the high pressure decreases instead, which indicates that there is leakage in the hydraulic system, and the leakage is at the high pressure side of the main oil circuit, so it should be stopped for treatment
2. The high pressure is normal and the low pressure drops
it indicates that there is leakage in the low pressure system or the oil make-up system. Check the low pressure side of the main oil circuit, the auxiliary pump and the oil make-up system
3. The high pressure drops and the low pressure rises
it indicates that the high pressure and low pressure in the hydraulic system are channeling. It is necessary to check whether there is fluid channeling in the high pressure safety valve, bypass valve and shuttle valve< (2) oil pollution
1. The oil temperature rises
when the hydraulic oil is mixed with water, the oil emulsifies, the oil viscosity drops to the bottom, the system leakage increases, and the oil temperature rises rapidly
analysis: observe whether the oil level in the oil tank of the traction part rises, and observe whether there is precipitation in the oil sample. The oil will decompose after entering the water. The upper part is oil and the lower part is water. In this case, the oil should be changed immediately
2. There is abnormal sound in the traction part
when the hydraulic oil is mixed with the air, it can cause cavitation in the hydraulic system, and the oil pump will make abnormal sound. If it is not handled in time, the oil pump will be damaged
analysis: check whether the filter is blocked, whether the oil suction pipe leaks, and whether the liquid level of the traction oil tank is too low. All these are the main reasons for the system suction, which should be dealt with in time
3. Filter blockage, hydraulic system leakage
hydraulic oil mixed with mechanical impurities will cause filter blockage. If the filter is not cleaned frequently, mechanical impurities will enter the hydraulic system, causing some hydraulic components to be damaged and causing system leakage
analysis: in order to prevent this phenomenon, the filter should be checked and cleaned every shift, and the pumping samples should be regularly observed and analyzed
4. The servo mechanism moves slowly
because the hydraulic oil is polluted, the leakage of the hydraulic system increases, the pressure and flow of the hydraulic system decrease, so the servo mechanism moves slowly, the traction force and traction speed of the shearer decrease, and the shearer does not work normally< 3. Analysis and treatment of common faults in hydraulic system of shearer (1) causes and treatment methods of non traction when shearer is hauled
1. Causes
this situation is mainly caused by serious pollution of hydraulic oil and over limit of mechanical impurities in oil. Due to dirty oil, there may be impurities between the valve seat and the valve core of the makeup check valve or the rectifier valve (shuttle valve). When the stuck mechanical impurities are small, the shearer traction is weak; When the stuck impurities are large, the shearer will not pull; When the stuck impurities are washed away by the oil, the shearer traction is normal; When the impurity is stuck between the valve core and the valve seat again, the phenomenon of weak traction or no traction appears
2. Treatment
it is better to replace the traction part. If this condition is not met, clean or replace the oil filling check valve or the main hydraulic pump, and then clean the oil tank of the traction part
the cleaning method is to add low viscosity turbine oil (turbine oil) and drain the oil after idling for about 30 minutes. Then add a small amount of anti-wear hydraulic oil of specified brand and run it for about 10 minutes before entering. Finally, inject oil according to the specified brand and oil quantity< (2) the reason why the shearer can only pull in one direction and the treatment method
(1) the hydraulic control one-way valve oil circuit or servo valve return oil circuit of the servo variable mechanism is blocked or stuck, and the return oil circuit is blocked, which makes the shearer unable to change direction
treatment: repair the hydraulic control check valve or servo valve, remove the blocked foreign matters, and change the oil if necessary
(2) there is leakage in the oil pipe between servo valve and hydraulic control check valve or oil cylinder, which causes the shearer can not change direction
treatment: tighten all loose joints, replace damaged seals, and replace or repair leaking oil pipes
(3) the servo variable mechanism is not adjusted properly, and the angle of the main hydraulic pump can not swing over (cannot exceed the zero position), resulting in the shearer can not change direction
processing: readjust the servo variable mechanism until the main hydraulic pump can flexibly pass through the zero position
(4) the potentiometer or solenoid valve is damaged, such as broken wire or poor contact, which makes the shearer unable to change direction
treatment: repair or replace the electrical components of the damaged ring< (3) causes and treatment methods of abnormal sound proced by hydraulic traction
1. Main oil system is short of oil
treatment: find out the causes and deal with them
2. There is air in the hydraulic system
treatment: find out the cause of the air and eliminate it, and then exhaust the air in the system again
3. The main oil system has external leakage
treatment: find out the cause and location of the leakage. Tighten loose joints, replace damaged seals or hydraulic components, eliminate leakage
4. The hydraulic pump or motor is damaged
treatment: replace the pump or motor< (4) causes and treatment methods of low or no pressure in the oil replenishing heat exchange system
1. Causes
(1) the oil level in the oil tank is too low or the viscosity of the oil is too high, resulting in oil pollution and air absorption
(2) the filter is blocked
(3) the setting value of the back pressure valve is low or the main valve core or pilot hole of the back pressure valve is blocked e to the unclean system oil
(4) leakage of oil make-up system or main pipe circuit
(5) the setting value of safety valve of make-up pump is low or damaged
(6) the motor reverses
(7) the seal of the oil suction pipe is damaged, the pipe joint is loose, the pipeline leaks air or the oil viscosity is high
(8) the oil spline of the makeup pump is polished or the pump is damaged
2. Treatment methods
(1) fill in the liquid according to the regulations. If the oil is suspected to be contaminated, replace it with new oil in time
(2) replace or clean the filter element according to the specified time
(3) clean and adjust the back pressure valve or replace the damaged back pressure valve
(4) replace the leaking oil pipes and seals. If the oil pipes of the oil replenishment system leak, the pressure and back pressure of the oil replenishment pressure gauge on the hydraulic tank will drop obviously. When the upper cover of the hydraulic tank is opened, the leakage of the mole will be obvious, especially when the motor stops or is about to stop
(5) set the safety valve of the make-up pump as required, and replace it if it is damaged
(6) correct the steering of the motor
(7) tighten the loose joint and replace the seal and oil suction pipe
(8) replace the hollow shaft of the make-up pump, and replace it with a new one when the pump is damaged< (5) causes of overheating of hydraulic traction unit and treatment methods
1. Causes
(1) insufficient cooling water flow or no cooling water
(2) the cooling water is short circuited and the traction part is not cooled
(3) the gear wear exceeds the limit and the contact accuracy is too low
(4) improper fit clearance between shaft and hole, bearing and outer sleeve and seat hole
(5) too much or too little oil
(6) improper use of oil, too high or too low viscosity of oil, or too much water and impurities in oil
(7) the hydraulic system has external leakage< (1) remove the blockage of the cooling water system, or open the closed valve to ensure the smooth flow of water, and ensure the quality of water supply and cooling effect
(2) find out the location and repair
(3) replace the worn wheel and oil, and replace the traction part if necessary
(4) replace the shaft and bearing and repair the hole seat
(5) adjust to the specified amount of oil
(6) replace with a new oil of specified variety and brand
(7) find out the cause and repair it< (6) causes and treatment methods of slow traction speed
1. Causes
(1) loose screw of speed regulating mechanism, incorrect adjustment of pull rod or too large axial clearance to reach the specified value, and small swing angle of main pump ring speed regulation
(2) if the brake is not released, the traction resistance is large
(3) the bearing of the traveling mechanism is seriously damaged, and the chute or slipper wheel is lost< (4) the control pressure is low
2. Treatment methods
(1) adjust the pull rod to the correct position to achieve accurate and sensitive action
(2) when the brake pressure oil source is connected and the working face inclination is less than 120, the brake can not be installed
(3) determine the damage degree of the walking parts. If it needs to be replaced, it should be replaced in time. If it is down the road, it should be on the road in time. If the slipper is lost, it should also be installed in time
(4) see (4) trouble shooting of oil make-up heat exchange system< (7) the causes and treatment of the damage of the oil distribution plate of the inclined axial piston variable displacement pump shortly after use
1. Causes
(1) the hydraulic oil is seriously polluted, the mechanical impurities in the oil exceed the limit, the oil distribution pair proces abrasive wear, and the oil distribution plate is worn beyond the limit or damaged
(2) the water in the hydraulic oil of the traction unit exceeds the limit, which causes the oil emulsion or oil oxidation deterioration, oil film strength decline, and boundary friction between the oil distribution pairs, resulting in the oil distribution plate quickly worn and the overrun surface damaged
(3) serious shortage of oil. Due to oil pollution and mechanical impurities overrun, make-up oil components or pipelines blocked, or e to the fault of the make-up oil circuit itself, resulting in insufficient flow of the main oil circuit, there is boundary friction between the oil distribution pairs of the hydraulic pump, resulting in damage to the oil distribution plate of the hydraulic pump
(4) improper oil type, low viscosity of oil and semi dry friction between oil distribution pairs lead to quick damage of oil distribution plate
2. Treatment methods
(1) repair or replace the oil distribution plate, regularly check the oil quality, and timely replace the oil if it is found to be unqualified
(2) find out the cause of water in the oil and eliminate it, and then the repairman will replace the oil distributor
(3) find out the cause of insufficient oil quantity, deal with it well, and replace the oil whose pollution quality exceeds the limit< (8) causes and treatment methods of no flow or insufficient flow in auxiliary hydraulic system
(2) the oil suction filter is blocked, resulting in too much water flow in the pump
(3) the hydraulic pump is damaged or the leakage is too large
(4) there is external leakage in the system, and the flow rate is insufficient
2. Treatment method
(1) add the oil to the specified requirements
(2) clean or replace the filter
(3) repair or replace the hydraulic pump
(4) repair the leakage< (9) the causes and treatment methods of the drum can not be raised or the lifting action is slow
1. Causes
(1) the raising pump is damaged, the leakage is too large and the flow is too small
(2) the lifting cylinder is damaged or the upper and lower cavities are leaking
(3) the safety valve is damaged or the setting value is too low
(4) tubing damage
(2) the hydraulic transmission system is mainly connected by pipelines and uses hydraulic oil to transmit power, so pipeline leakage will seriously affect the performance of the system
(3) the working medium of hydraulic transmission system is hydraulic oil, and the change of oil temperature has a great influence on the system. The change of oil temperature directly affects the viscosity
(4) hydraulic components have high manufacturing accuracy and small clearance, most of which are clearance fit, especially the main components such as hydraulic pump and hydraulic motor, which not only have good sealing and flexible action, but also use oil film to rece metal friction. This requires that there should be no moisture, air and mechanical impurities in the hydraulic oil, otherwise the components will be worn and stuck
(5) the hydraulic system of the shearer is equipped with a variety of protections, so the setting value in the system must be accurate and reliable, otherwise the performance of the shearer will be affected< The hydraulic system of shearer is divided into two parts: high pressure and low pressure. The high voltage increases with the increase of load, the low voltage is constant, and the increase or decrease of load has no effect on the low voltage
1. The low pressure is normal, but the high pressure decreases
when the load increases, the high pressure decreases instead, which indicates that there is leakage in the hydraulic system, and the leakage is at the high pressure side of the main oil circuit, so it should be stopped for treatment
2. The high pressure is normal and the low pressure drops
it indicates that there is leakage in the low pressure system or the oil make-up system. Check the low pressure side of the main oil circuit, the auxiliary pump and the oil make-up system
3. The high pressure drops and the low pressure rises
it indicates that the high pressure and low pressure in the hydraulic system are channeling. It is necessary to check whether there is fluid channeling in the high pressure safety valve, bypass valve and shuttle valve< (2) oil pollution
1. The oil temperature rises
when the hydraulic oil is mixed with water, the oil emulsifies, the oil viscosity drops to the bottom, the system leakage increases, and the oil temperature rises rapidly
analysis: observe whether the oil level in the oil tank of the traction part rises, and observe whether there is precipitation in the oil sample. The oil will decompose after entering the water. The upper part is oil and the lower part is water. In this case, the oil should be changed immediately
2. There is abnormal sound in the traction part
when the hydraulic oil is mixed with the air, it can cause cavitation in the hydraulic system, and the oil pump will make abnormal sound. If it is not handled in time, the oil pump will be damaged
analysis: check whether the filter is blocked, whether the oil suction pipe leaks, and whether the liquid level of the traction oil tank is too low. All these are the main reasons for the system suction, which should be dealt with in time
3. Filter blockage, hydraulic system leakage
hydraulic oil mixed with mechanical impurities will cause filter blockage. If the filter is not cleaned frequently, mechanical impurities will enter the hydraulic system, causing some hydraulic components to be damaged and causing system leakage
analysis: in order to prevent this phenomenon, the filter should be checked and cleaned every shift, and the pumping samples should be regularly observed and analyzed
4. The servo mechanism moves slowly
because the hydraulic oil is polluted, the leakage of the hydraulic system increases, the pressure and flow of the hydraulic system decrease, so the servo mechanism moves slowly, the traction force and traction speed of the shearer decrease, and the shearer does not work normally< 3. Analysis and treatment of common faults in hydraulic system of shearer (1) causes and treatment methods of non traction when shearer is hauled
1. Causes
this situation is mainly caused by serious pollution of hydraulic oil and over limit of mechanical impurities in oil. Due to dirty oil, there may be impurities between the valve seat and the valve core of the makeup check valve or the rectifier valve (shuttle valve). When the stuck mechanical impurities are small, the shearer traction is weak; When the stuck impurities are large, the shearer will not pull; When the stuck impurities are washed away by the oil, the shearer traction is normal; When the impurity is stuck between the valve core and the valve seat again, the phenomenon of weak traction or no traction appears
2. Treatment
it is better to replace the traction part. If this condition is not met, clean or replace the oil filling check valve or the main hydraulic pump, and then clean the oil tank of the traction part
the cleaning method is to add low viscosity turbine oil (turbine oil) and drain the oil after idling for about 30 minutes. Then add a small amount of anti-wear hydraulic oil of specified brand and run it for about 10 minutes before entering. Finally, inject oil according to the specified brand and oil quantity< (2) the reason why the shearer can only pull in one direction and the treatment method
(1) the hydraulic control one-way valve oil circuit or servo valve return oil circuit of the servo variable mechanism is blocked or stuck, and the return oil circuit is blocked, which makes the shearer unable to change direction
treatment: repair the hydraulic control check valve or servo valve, remove the blocked foreign matters, and change the oil if necessary
(2) there is leakage in the oil pipe between servo valve and hydraulic control check valve or oil cylinder, which causes the shearer can not change direction
treatment: tighten all loose joints, replace damaged seals, and replace or repair leaking oil pipes
(3) the servo variable mechanism is not adjusted properly, and the angle of the main hydraulic pump can not swing over (cannot exceed the zero position), resulting in the shearer can not change direction
processing: readjust the servo variable mechanism until the main hydraulic pump can flexibly pass through the zero position
(4) the potentiometer or solenoid valve is damaged, such as broken wire or poor contact, which makes the shearer unable to change direction
treatment: repair or replace the electrical components of the damaged ring< (3) causes and treatment methods of abnormal sound proced by hydraulic traction
1. Main oil system is short of oil
treatment: find out the causes and deal with them
2. There is air in the hydraulic system
treatment: find out the cause of the air and eliminate it, and then exhaust the air in the system again
3. The main oil system has external leakage
treatment: find out the cause and location of the leakage. Tighten loose joints, replace damaged seals or hydraulic components, eliminate leakage
4. The hydraulic pump or motor is damaged
treatment: replace the pump or motor< (4) causes and treatment methods of low or no pressure in the oil replenishing heat exchange system
1. Causes
(1) the oil level in the oil tank is too low or the viscosity of the oil is too high, resulting in oil pollution and air absorption
(2) the filter is blocked
(3) the setting value of the back pressure valve is low or the main valve core or pilot hole of the back pressure valve is blocked e to the unclean system oil
(4) leakage of oil make-up system or main pipe circuit
(5) the setting value of safety valve of make-up pump is low or damaged
(6) the motor reverses
(7) the seal of the oil suction pipe is damaged, the pipe joint is loose, the pipeline leaks air or the oil viscosity is high
(8) the oil spline of the makeup pump is polished or the pump is damaged
2. Treatment methods
(1) fill in the liquid according to the regulations. If the oil is suspected to be contaminated, replace it with new oil in time
(2) replace or clean the filter element according to the specified time
(3) clean and adjust the back pressure valve or replace the damaged back pressure valve
(4) replace the leaking oil pipes and seals. If the oil pipes of the oil replenishment system leak, the pressure and back pressure of the oil replenishment pressure gauge on the hydraulic tank will drop obviously. When the upper cover of the hydraulic tank is opened, the leakage of the mole will be obvious, especially when the motor stops or is about to stop
(5) set the safety valve of the make-up pump as required, and replace it if it is damaged
(6) correct the steering of the motor
(7) tighten the loose joint and replace the seal and oil suction pipe
(8) replace the hollow shaft of the make-up pump, and replace it with a new one when the pump is damaged< (5) causes of overheating of hydraulic traction unit and treatment methods
1. Causes
(1) insufficient cooling water flow or no cooling water
(2) the cooling water is short circuited and the traction part is not cooled
(3) the gear wear exceeds the limit and the contact accuracy is too low
(4) improper fit clearance between shaft and hole, bearing and outer sleeve and seat hole
(5) too much or too little oil
(6) improper use of oil, too high or too low viscosity of oil, or too much water and impurities in oil
(7) the hydraulic system has external leakage< (1) remove the blockage of the cooling water system, or open the closed valve to ensure the smooth flow of water, and ensure the quality of water supply and cooling effect
(2) find out the location and repair
(3) replace the worn wheel and oil, and replace the traction part if necessary
(4) replace the shaft and bearing and repair the hole seat
(5) adjust to the specified amount of oil
(6) replace with a new oil of specified variety and brand
(7) find out the cause and repair it< (6) causes and treatment methods of slow traction speed
1. Causes
(1) loose screw of speed regulating mechanism, incorrect adjustment of pull rod or too large axial clearance to reach the specified value, and small swing angle of main pump ring speed regulation
(2) if the brake is not released, the traction resistance is large
(3) the bearing of the traveling mechanism is seriously damaged, and the chute or slipper wheel is lost< (4) the control pressure is low
2. Treatment methods
(1) adjust the pull rod to the correct position to achieve accurate and sensitive action
(2) when the brake pressure oil source is connected and the working face inclination is less than 120, the brake can not be installed
(3) determine the damage degree of the walking parts. If it needs to be replaced, it should be replaced in time. If it is down the road, it should be on the road in time. If the slipper is lost, it should also be installed in time
(4) see (4) trouble shooting of oil make-up heat exchange system< (7) the causes and treatment of the damage of the oil distribution plate of the inclined axial piston variable displacement pump shortly after use
1. Causes
(1) the hydraulic oil is seriously polluted, the mechanical impurities in the oil exceed the limit, the oil distribution pair proces abrasive wear, and the oil distribution plate is worn beyond the limit or damaged
(2) the water in the hydraulic oil of the traction unit exceeds the limit, which causes the oil emulsion or oil oxidation deterioration, oil film strength decline, and boundary friction between the oil distribution pairs, resulting in the oil distribution plate quickly worn and the overrun surface damaged
(3) serious shortage of oil. Due to oil pollution and mechanical impurities overrun, make-up oil components or pipelines blocked, or e to the fault of the make-up oil circuit itself, resulting in insufficient flow of the main oil circuit, there is boundary friction between the oil distribution pairs of the hydraulic pump, resulting in damage to the oil distribution plate of the hydraulic pump
(4) improper oil type, low viscosity of oil and semi dry friction between oil distribution pairs lead to quick damage of oil distribution plate
2. Treatment methods
(1) repair or replace the oil distribution plate, regularly check the oil quality, and timely replace the oil if it is found to be unqualified
(2) find out the cause of water in the oil and eliminate it, and then the repairman will replace the oil distributor
(3) find out the cause of insufficient oil quantity, deal with it well, and replace the oil whose pollution quality exceeds the limit< (8) causes and treatment methods of no flow or insufficient flow in auxiliary hydraulic system
(2) the oil suction filter is blocked, resulting in too much water flow in the pump
(3) the hydraulic pump is damaged or the leakage is too large
(4) there is external leakage in the system, and the flow rate is insufficient
2. Treatment method
(1) add the oil to the specified requirements
(2) clean or replace the filter
(3) repair or replace the hydraulic pump
(4) repair the leakage< (9) the causes and treatment methods of the drum can not be raised or the lifting action is slow
1. Causes
(1) the raising pump is damaged, the leakage is too large and the flow is too small
(2) the lifting cylinder is damaged or the upper and lower cavities are leaking
(3) the safety valve is damaged or the setting value is too low
(4) tubing damage
8. First of all, consider whether the pipeline is blocked or leaking oil. This is a good way to check whether the oil outlet is blocked to see if the pressure changes. Secondly, check whether the gear pump is seriously worn. The gear pump with serious wear is unable to supply oil to the oil cylinder, or the oil supply pressure is not enough. Again, check whether the hydraulic lock of the oil cylinder can not seal oil. Left and right are not high may be the first two problems, there may be a problem with the multi-channel directional valve.
9. The roadheader is used to drive the tunnel. In the coal mine, there are all rock, half rock and coal rock; It can also be used in the tunnel of the mine. The shield machine for repairing the subway is another form of the tunnel boring machine
shearer is a special coal mining equipment in working face, which should be used with scraper conveyor
scraper conveyor is also used in coal mining face, one is as the track of shearer; The second is to transport the coal cut by the shearer out of the working face
the hydraulic support is the support equipment of the working face, and it is discharged on the working face to protect the safety of workers, workers and mining equipment.
shearer is a special coal mining equipment in working face, which should be used with scraper conveyor
scraper conveyor is also used in coal mining face, one is as the track of shearer; The second is to transport the coal cut by the shearer out of the working face
the hydraulic support is the support equipment of the working face, and it is discharged on the working face to protect the safety of workers, workers and mining equipment.
Hot content