CN113175452A - Hydraulic pressure is decided, becomes online switched systems of loading of wheeled intermediate speed coal pulverizer - Google Patents
Hydraulic pressure is decided, becomes online switched systems of loading of wheeled intermediate speed coal pulverizer Download PDFInfo
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- CN113175452A CN113175452A CN202110533259.2A CN202110533259A CN113175452A CN 113175452 A CN113175452 A CN 113175452A CN 202110533259 A CN202110533259 A CN 202110533259A CN 113175452 A CN113175452 A CN 113175452A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention belongs to the technical field of hydraulic control, and particularly relates to a hydraulic constant-load and variable-load online switching system of a wheel type medium-speed coal mill, which comprises a hydraulic oil tank, wherein two oil outlets and seven oil return ports are arranged on the hydraulic oil tank, the two oil outlets are respectively connected with an acting force oil loop and a reaction force oil loop, and an acting force duplicate gear oil pump and a reaction force duplicate gear oil pump are arranged in the hydraulic oil tank; the acting force oil loop comprises an oil pump motor, the oil pump motor is connected to an acting force electromagnetic directional valve through an acting force duplicate gear oil pump, an acting force constant loading safety overflow valve and an acting force proportion overflow valve in sequence, and the acting force electromagnetic directional valve is connected to oil return ports of a first hydraulic oil cylinder, a second hydraulic oil cylinder, a third hydraulic oil cylinder and a hydraulic oil tank respectively. The invention can realize the switching of the fixed-variable loading mode of the system, reduce the failure rate of hydraulic pressure, and simultaneously quickly recover after the hydraulic system fails, thereby reducing the maintenance time.
Description
Technical Field
The invention belongs to the technical field of hydraulic control, and particularly relates to a hydraulic constant-load and variable-load online switching system of a wheel type medium-speed coal mill.
Background
The hydraulic system is used as a grinding pressure providing device of the vertical roller medium-speed coal mill, has the characteristics of small floor area, stable pressure providing, high grade of loading force and the like, and is widely applied to the fields of thermal power generation, chemical industry, steel mills, mines and the like. A hydraulic system of a traditional vertical roller medium-speed coal mill adopts a variable loading working mode. The grinding pressure provided by the hydraulic system changes in real time according to the required output, and the working mode has the advantages of multiple coal adaptation and wide pressure adjusting range.
In the initial stage of coal mill debugging and equipment operation, the hydraulic station variable loading control mode is convenient to adjust, and the pressure is adjusted at any time in the initial stage of equipment debugging and equipment starting when the load is unstable. However, after the equipment is stably operated, the hydraulic system can be operated under a stable load all year round. The hydraulic station does not need to frequently adjust pressure at the moment, but a motor of the hydraulic station is in long-term variable loading operation, so that the risks of valve blockage, valve bank jamming, motor burnout and oil pump grinding exist. Once the hydraulic oil station has problems, such as blockage of a proportional valve, damage of an amplification plate, burning of a motor, damage of an oil pump, blocking of a valve and the like, the whole shutdown of the coal mill equipment can be caused.
Aiming at the problems, an online switching system for hydraulic pressure setting and variable loading of a wheel type medium-speed coal mill is provided.
Disclosure of Invention
The invention provides a hydraulic constant and variable loading online switching system of a wheel type medium-speed coal mill, and aims to realize the constant and variable loading mode switching of the system, reduce the failure rate of hydraulic pressure, quickly recover after the hydraulic system fails and reduce the maintenance time.
In order to achieve the purpose, the invention adopts the technical scheme that:
a wheel type medium-speed coal mill hydraulic pressure is fixed, become the online switching system of loading, including the hydraulic tank, there are two oil outlets and seven oil return ports on the hydraulic tank, two oil outlets connect acting force oil circuit and reaction force oil circuit separately, there are acting force duplicate gear oil pumps and reaction force duplicate gear oil pumps in the hydraulic tank;
the acting force oil loop comprises an oil pump motor, the oil pump motor is connected to an acting force electromagnetic directional valve through an acting force duplicate gear oil pump, an acting force constant loading safety overflow valve and an acting force proportion overflow valve in sequence, and the acting force electromagnetic directional valve is respectively connected to oil return ports of a first hydraulic oil cylinder, a second hydraulic oil cylinder, a third hydraulic oil cylinder and a hydraulic oil tank;
the reaction force loop comprises an oil pump motor, the oil pump motor is connected to a reaction force electromagnetic directional valve through a reaction force duplicate gear oil pump, a reaction force constant-loading safety overflow valve and a reaction force proportional overflow valve in sequence, and the reaction force electromagnetic directional valve is respectively connected with oil return ports of a first hydraulic oil cylinder, a second hydraulic oil cylinder, a third hydraulic oil cylinder and a hydraulic oil tank.
Furthermore, an acting force loading pressure transmitter and a reacting force loading pressure transmitter are respectively arranged at the outlets of the acting force electromagnetic directional valve and the reacting force electromagnetic directional valve.
Furthermore, an acting force variable-loading in-situ pressure meter and an acting force fixed-loading pressure transmitter are arranged at the inlet of the acting force electromagnetic directional valve.
Furthermore, a reaction force variable-loading in-situ pressure meter and a reaction force variable-loading pressure transmitter are arranged at the inlet of the reaction force electromagnetic directional valve.
Further, the acting force electromagnetic directional valve is also connected with the reacting force electromagnetic directional valve and is connected to the oil tank through a double-cylinder filter.
Furthermore, the first hydraulic oil cylinder, the second hydraulic oil cylinder and the third hydraulic oil cylinder are respectively connected with the first energy accumulator, the second energy accumulator and the third energy accumulator, and the first hydraulic oil cylinder, the second hydraulic oil cylinder and the third hydraulic oil cylinder are respectively connected with the first pressure relief safety valve, the second pressure relief safety valve and the third pressure relief safety valve.
Further, still include stand-by motor, reserve effort oil pump and reserve reaction force oil pump 23, stand-by motor passes through the exit that reserve effort oil pump is connected to the effort duplicate gear oil pump, and stand-by motor passes through the exit that reserve reaction force oil pump is connected to the reaction force duplicate gear oil pump.
Compared with the prior art, the invention has the following beneficial effects:
in the initial debugging and running stage of the coal mill, variable loading operation is adopted, so that the experiment and the load change are facilitated; the working mode of variable loading is switched to the working mode of fixed loading, and the pressure can be increased and reduced in real time by adding the acting force proportional overflow valve, the reacting force proportional overflow valve, the acting force variable loading local pressure gauge and the reacting force variable loading local pressure gauge, so that the safe and stable operation of the equipment is ensured. When the hydraulic system is loaded regularly, the oil pump motor can be stopped, the hydraulic system realizes automatic pressure maintaining, and the power consumption of the equipment is reduced. Once the pressure of the equipment needs to be adjusted, the oil pump motor can be started at any time, the electromagnetic valve is switched to a variable loading working mode, and various working condition requirements on the site are met.
When the hydraulic system is in fixed loading operation, if the oil pump motor continues to operate, hydraulic oil pumped by the oil pump can directly return to the oil tank, at the moment, the oil pump motor can be stopped, self-holding is realized due to oil pressure in the pipeline, and stable operation of equipment can be guaranteed. In order to avoid accidents caused by pipeline blockage, a first pressure relief safety valve, a second pressure relief safety valve and a third pressure relief safety valve are additionally arranged in a hydraulic system, so that the safety of equipment is ensured. When the system needs to frequently adjust the coal mill equipment, the hydraulic system can be switched from a fixed loading working mode to a variable loading working mode on line, and the operation is flexible and convenient.
When the hydraulic system operates in a constant loading mode, the pressure in an oil pipeline can be fed back in real time through the acting force loading pressure transmitter and the counterforce variable loading pressure transmitter, online oil pressure monitoring is achieved, once the pressure leaks, the pressure changes rapidly or the corresponding deviation of the pressure and a curve is larger than 3MPa, the system can start an oil pump motor and switch an electromagnetic directional valve to a proportional overflow valve, and the continuous operation of equipment is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a hydraulic pressure constant-variable loading on-line switching system of a wheel type medium-speed coal mill;
FIG. 2 is a schematic diagram of a variable loading oil circuit of a hydraulic pressure fixing and variable loading on-line switching system of the wheel type medium-speed coal mill;
FIG. 3 is a schematic diagram of a fixed-loading oil circuit of a hydraulic fixed-loading and variable-loading online switching system of the wheel type medium-speed coal mill;
FIG. 4 is a schematic diagram of a hydraulic system for switching constant and variable loading on line in a double-pump mode of a hydraulic system for switching constant and variable loading on line in a wheel type medium speed coal mill.
Wherein: 1-an oil pump motor; 2-acting force dual gear oil pump; 3-reaction force dual gear oil pump; 4-acting force constant loading safety overflow valve; 5-a reaction force fixed loading safety overflow valve; 6-double-cylinder filter; 7-reaction proportional relief valve; 8-acting force proportional overflow valve; 9-a reaction force variable loading local pressure gauge; 10-reaction force variable loading pressure transmitter; 11-acting force variable loading on-site pressure gauge; 12-acting force fixed loading pressure transmitter; 13-force electromagnetic directional valve; 14-reaction force electromagnetic directional valve; 15-reaction force loading pressure transmitter; 16-force-loaded pressure transmitter; 171-a first hydraulic ram; 172-a second hydraulic cylinder; 173-a third hydraulic ram; 18-a hydraulic oil tank; 191 — a first accumulator; 192-a second accumulator; 193-a third accumulator; 201-a first pressure relief safety valve; 202-a second pressure relief safety valve; 203-a third pressure relief safety valve; 21-a standby motor; 22-a reserve-force oil pump; 23-backup reaction oil pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the hydraulic constant-variable loading online switching system of the wheel-type medium-speed coal mill comprises a hydraulic oil tank 18, wherein two oil outlets and seven oil return ports are formed in the hydraulic oil tank 18, the two oil outlets are respectively connected with an acting force oil loop and a reacting force oil loop, and an acting force duplicate gear oil pump 2 and a reacting force duplicate gear oil pump 3 are arranged in the hydraulic oil tank 18.
The acting force oil loop comprises an oil pump motor 1, the oil pump motor 1 is connected to an acting force electromagnetic directional valve 13 through an acting force duplicate gear oil pump 2, an acting force constant loading safety overflow valve 4 and an acting force proportion overflow valve 8 in sequence, and the acting force electromagnetic directional valve 13 is respectively connected to oil return ports of a first hydraulic oil cylinder 171, a second hydraulic oil cylinder 172, a third hydraulic oil cylinder 173 and a hydraulic oil tank 18.
The reaction force loop comprises an oil pump motor 1, the oil pump motor 1 is connected to a reaction force electromagnetic directional valve 14 sequentially through a reaction force duplicate gear oil pump 3, a reaction force fixed-loading safety overflow valve 5 and a reaction force proportional overflow valve 7, and the reaction force electromagnetic directional valve 14 is respectively connected with oil return ports of a first hydraulic oil cylinder 171, a second hydraulic oil cylinder 172, a third hydraulic oil cylinder 173 and a hydraulic oil tank 18.
The first hydraulic cylinder 171, the second hydraulic cylinder 172 and the third hydraulic cylinder 173 are connected to a first accumulator 191, a second accumulator 192 and a third accumulator 193, respectively, and the first hydraulic cylinder 171, the second hydraulic cylinder 172 and the third hydraulic cylinder 173 are connected to a first relief safety valve 201, a second relief safety valve 202 and a third relief safety valve 203, respectively.
An acting force loading pressure transmitter 16 and a reacting force loading pressure transmitter 15 are respectively arranged at the outlets of the acting force electromagnetic directional valve 13 and the reacting force electromagnetic directional valve 14, an acting force variable loading in-situ pressure gauge 11 and an acting force constant loading pressure transmitter 12 are arranged at the inlet of the acting force electromagnetic directional valve 13, and an reacting force variable loading in-situ pressure gauge 9 and an reacting force variable loading pressure transmitter 10 are arranged at the inlet of the reacting force electromagnetic directional valve 14.
The force solenoid directional valve 13 is also connected to the reaction force solenoid directional valve 14 and to the tank 18 via the double filter 6.
As a further alternative of the present embodiment, the present invention further includes a backup motor 21, a backup-force oil pump 22, and a backup-force oil pump 23, the backup motor 21 being connected to the outlet of the force-dual-gear oil pump 2 through the backup-force oil pump 22, and the backup motor 21 being connected to the outlet of the reaction-force-dual-gear oil pump 3 through the backup-force oil pump 23.
As shown in fig. 2, 3 and 4, the principle of use of the present invention is:
firstly, a grinding roller lifting process: the grinding roller lifting process is that the coal mill is adjusted from a shutdown state to a standby state before operation, at the moment, the oil pump motor 1 is started, the oil pump motor 1 drives the acting force duplicate gear oil pump 2 and the reacting force duplicate gear oil pump 3 to operate, the opening of the acting force proportion overflow valve 8 returns to zero, the opening of the reacting force proportion overflow valve 7 returns to 50%, at the moment, the acting force variable loading on-site pressure gauge 11 and the acting force constant loading pressure transmitter 12 display zero, the feedback of the reacting force variable loading on-site pressure gauge 9 and the reacting force variable loading pressure transmitter 10 is more than or equal to 2.5MPa, hydraulic oil of an acting force loop returns to the oil tank 18 through the acting force electromagnetic reversing valve 13, and the hydraulic oil of the reacting force loop respectively enters rodless cavities of the first hydraulic oil cylinder 171, the second hydraulic oil cylinder 172 and the third hydraulic oil cylinder 173 through three branch pipelines.
After the rodless cavities in the first hydraulic oil cylinder 171, the second hydraulic oil cylinder 172 and the third hydraulic oil cylinder 173 are in place, the acting force electromagnetic directional valve 13 and the reaction force electromagnetic directional valve 14 are powered on, the pressure in oil cylinder pipelines is locked, the on-line switching of the fixed loading is realized, the system is maintained in a fixed loading mode, the internal pressure of the system is self-maintained, and the hydraulic oil pumped out by the acting force duplicate gear oil pump 2 and the reaction force duplicate gear oil pump 3 directly returns to the oil tank 18 through the acting force electromagnetic directional valve 13 and the reaction force electromagnetic directional valve 14. And stopping the oil pump motor 1 until the grinding roller lifting process is finished.
Secondly, the descending process of the grinding roller: the grinding roller descending process is that the coal mill is in a standby state and is in a shutdown state, the oil pump motor 1 is started at the moment, the oil pump motor 1 drives the acting force duplicate gear oil pump 2 and the reaction force duplicate gear oil pump 3 to run, the acting force electromagnetic directional valve 13 and the reaction force electromagnetic directional valve 14 are electrified, hydraulic oil pumped out by the acting force duplicate gear oil pump 2 and the reaction force duplicate gear oil pump 3 directly returns to the oil tank 18 through the electromagnetic directional valve, the acting force electromagnetic directional valve 13 and the reaction force electromagnetic directional valve 14 are powered off, an oil path of the electromagnetic directional valve is switched to a proportional overflow valve loop, the opening degree of the reaction force proportional overflow valve 7 is reset to zero, rodless cavities of the first hydraulic oil cylinder 171, the second hydraulic oil cylinder 172 and the third hydraulic oil cylinder 173 begin to be emptied due to the dead weight of the grinding roller and the loading frame, and the hydraulic oil in the rodless cavities returns to the oil tank through the double-cylinder filter 6.
And after the stroke of the rodless cavity is in place, stopping the oil pump motor 1 of the hydraulic station until the descending process of the grinding roller is finished.
Thirdly, a grinding roller loading process: the grinding roller loading process is a process of the coal mill from a standby position to a normal working state. When the oil pump motor 1 is started, the acting force electromagnetic directional valve 13 and the reaction force electromagnetic directional valve 14 are in the charged position, so that the hydraulic oil directly returns to the oil tank 18 after passing through the electromagnetic directional valves. The acting force electromagnetic directional valve 13 and the reacting force electromagnetic directional valve 14 are powered off, the oil path of the hydraulic station is switched back to the reacting force proportional overflow valve 7 and the acting force proportional overflow valve 8 for control, the opening degree of the acting force proportional overflow valve 8 is increased from 0% to 30% according to the coal feeding amount of the coal mill, the rod cavities of the first hydraulic cylinder 171, the second hydraulic cylinder 172 and the third hydraulic cylinder 173 start to inject hydraulic oil, the acting force oil pump power is far higher than that of the reacting force oil pump, the pressure of the rod cavity is higher than that of the rodless cavity, the piston of the oil cylinder moves downwards, the pull rod, the loading frame and the grinding roller connected with the piston move downwards, the opening degree of the proportional overflow valve is adjusted, the acting force proportional overflow valve 8 is controlled to be fixed at 413161, the reacting force proportional overflow valve 7 is fixed at 313161, and the grinding roller is in variable loading operation.
And electrifying the acting force electromagnetic directional valve 13 and the reacting force electromagnetic directional valve 14, switching the oil path to the fixed loading working condition for operation, and stopping the oil pump motor 1 until the grinding roller loading process is finished.
Fourthly, the unloading process of the grinding roller: the grinding roller unloading process is a process of changing the coal mill from a working position to a standby position. And starting the oil pump motor 1, wherein the oil pump motor 1 drives the acting force duplicate gear oil pump 2 and the reaction force duplicate gear oil pump 3 to operate, but the acting force electromagnetic directional valve 13 and the reaction force electromagnetic directional valve 14 are in a charged state, and the hydraulic oil directly returns to the oil tank 18 through the electromagnetic directional valves. And the electromagnetic directional valve is powered off, the hydraulic station is switched to a variable loading mode controlled by the proportional overflow valve on line, the opening of the acting force proportional overflow valve 8 is opened to 0 percent, the opening of the reaction force proportional overflow valve 7 is opened to 50 percent, the pressure in the rodless cavity of the first hydraulic oil cylinder 171, the second hydraulic oil cylinder 172 and the third hydraulic oil cylinder 173 is increased, and the hydraulic oil in the rod cavity returns to the oil tank after passing through the acting force proportional overflow valve 8 and the double-cylinder filter 6. After the piston in the rodless cavity is lifted in place, the acting force electromagnetic directional valve 13 and the counterforce electromagnetic directional valve 14 are electrified again, the oil pipeline behind the electromagnetic directional valve maintains pressure, and the fixed loading operation is carried out. And stopping the loading oil pump motor 1 of the hydraulic station until the unloading process of the grinding roller of the coal mill is finished.
And fifthly, an acting force loading pressure transmitter 16 and a reacting force loading pressure transmitter 15 are arranged behind the acting force electromagnetic directional valve 13 and the reacting force electromagnetic directional valve 14, so that the pressure deviation between the pressure and the coal feeding curve is less than or equal to 3MPa when the acting force electromagnetic directional valve and the reacting force electromagnetic directional valve are in constant loading operation, when the pressure deviation is overlarge, the motor is automatically started, the electromagnetic directional valve is automatically de-energized, and the constant loading operation is switched to a variable loading operation condition on line, so that the safe and stable operation of the equipment is ensured.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a wheel-type medium speed coal pulverizer hydraulic pressure is decided, becomes online switched systems of loading, includes hydraulic tank (18), its characterized in that: the hydraulic oil tank (18) is provided with two oil outlets and seven oil return ports, the two oil outlets are respectively connected with an acting force oil loop and a reacting force oil loop, and an acting force duplicate gear oil pump (2) and a reacting force duplicate gear oil pump (3) are arranged in the hydraulic oil tank (18);
the acting force oil loop comprises an oil pump motor (1), the oil pump motor (1) is connected to an acting force electromagnetic directional valve (13) through an acting force dual gear oil pump (2), an acting force constant loading safety overflow valve (4) and an acting force proportion overflow valve (8) in sequence, and the acting force electromagnetic directional valve (13) is connected to oil return ports of a first hydraulic oil cylinder (171), a second hydraulic oil cylinder (172), a third hydraulic oil cylinder (173) and a hydraulic oil tank (18) respectively;
the reaction force loop comprises an oil pump motor (1), the oil pump motor (1) is connected to a reaction force electromagnetic directional valve (14) through a reaction force duplicate gear oil pump (3), a reaction force fixed-loading safety overflow valve (5) and a reaction force proportional overflow valve (7) in sequence, and the reaction force electromagnetic directional valve (14) is connected with oil return ports of a first hydraulic oil cylinder (171), a second hydraulic oil cylinder (172), a third hydraulic oil cylinder (173) and a hydraulic oil tank (18) respectively.
2. The hydraulic constant-load and variable-load online switching system of the wheel type medium-speed coal mill according to claim 1, characterized in that: and an acting force loading pressure transmitter (16) and a reaction force loading pressure transmitter (15) are respectively arranged at the outlets of the acting force electromagnetic directional valve (13) and the reaction force electromagnetic directional valve (14).
3. The hydraulic constant-load and variable-load online switching system of the wheel type medium-speed coal mill according to claim 2, characterized in that: and an acting force variable loading local pressure gauge (11) and an acting force constant loading pressure transmitter (12) are arranged at the inlet of the acting force electromagnetic directional valve (13).
4. The on-line switching system for hydraulic constant and variable loading of the wheel type medium speed coal mill according to claim 3, characterized in that: and a reaction force variable-loading local pressure gauge (9) and a reaction force variable-loading pressure transmitter (10) are arranged at the inlet of the reaction force electromagnetic directional valve (14).
5. The on-line switching system for hydraulic constant and variable loading of the wheel type medium speed coal mill according to claim 4, characterized in that: the acting force electromagnetic directional valve (13) is also connected with a reaction force electromagnetic directional valve (14) and is connected to an oil tank (18) through a double-cylinder filter (6).
6. The on-line switching system for hydraulic constant and variable loading of the wheel type medium speed coal mill according to claim 5, characterized in that: the hydraulic system is characterized in that the first hydraulic oil cylinder (171), the second hydraulic oil cylinder (172) and the third hydraulic oil cylinder (173) are respectively connected with a first energy accumulator (191), a second energy accumulator (192) and a third energy accumulator (193), and the first hydraulic oil cylinder (171), the second hydraulic oil cylinder (172) and the third hydraulic oil cylinder (173) are respectively connected with a first pressure relief safety valve (201), a second pressure relief safety valve (202) and a third pressure relief safety valve (203).
7. The hydraulic constant-load and variable-load online switching system of the wheel type medium-speed coal mill according to claim 1, characterized in that: still include reserve motor 21, reserve effort oil pump 22 and reserve reaction force oil pump 23, reserve motor 21 is connected to the exit of effort duplicate gear oil pump 2 through reserve effort oil pump 22, and reserve motor 21 is connected to the exit of reaction force duplicate gear oil pump 3 through reserve reaction force oil pump 23.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110533259.2A CN113175452A (en) | 2021-05-17 | 2021-05-17 | Hydraulic pressure is decided, becomes online switched systems of loading of wheeled intermediate speed coal pulverizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110533259.2A CN113175452A (en) | 2021-05-17 | 2021-05-17 | Hydraulic pressure is decided, becomes online switched systems of loading of wheeled intermediate speed coal pulverizer |
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| CN113175452A true CN113175452A (en) | 2021-07-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114042525A (en) * | 2021-09-23 | 2022-02-15 | 中国大唐集团科学技术研究总院有限公司华东电力试验研究院 | Control method for lifting grinding roller of coal mill |
-
2021
- 2021-05-17 CN CN202110533259.2A patent/CN113175452A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114042525A (en) * | 2021-09-23 | 2022-02-15 | 中国大唐集团科学技术研究总院有限公司华东电力试验研究院 | Control method for lifting grinding roller of coal mill |
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