A rapid hydraulic system for the grinding roller of a vertical roller mill

Abstract

The present invention discloses a quick hydraulic system for the grinding roller of a vertical roller mill, which includes an oil tank, a power source system, a rod chamber channel, a rodless chamber channel and an oil tank circuit; the power source system includes two sets of parallel hydraulic power source systems; each set of hydraulic power source systems includes a high-pressure ball valve, an oil pump, a motor, a filter, a check valve I and a pressure relief valve. The oil supply port of the oil tank is sequentially connected to the P port of the corresponding electro-hydraulic directional valve through the high-pressure ball valve, the oil pump, the filter and the check valve I, and the outlet of the check valve I is connected to the oil tank circuit through the pressure relief valve; the A port of the electro-hydraulic directional valve is connected to the rod chamber channel, the B port is connected to the rodless chamber channel, and the T port is connected to the oil tank circuit; the rod chamber channel is connected to the rodless chamber channel through a plurality of parallel solenoid valves, the rod chamber channel is connected to the oil tank circuit through solenoid valve group I, and the rodless chamber channel is connected to the oil tank circuit through solenoid valve group II. The present invention improves the operation efficiency, shortens the roll-lifting time, improves the reliability, and is simple to operate and easy to maintain.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulics, and particularly to a quick hydraulic system for the grinding roller of a vertical roller mill. Background Art

[0002] Vertical roller mills are energy-saving grinding equipment currently widely used in industries such as cement, power, mining, and steel. During the production process of vertical roller mills, the hydraulic system is a key component required for the normal operation of the vertical roller mill and is the power source for the rolling pressure required by the vertical roller mill. The normal and efficient operation of the hydraulic system is crucial for maintaining the stable and efficient production of the vertical roller mill system.

[0003] The existing hydraulic systems of vertical roller mills generally have the following problems: high component failure rate, low operating efficiency, long roll lifting time, short maintenance cycle, etc.; resulting in poor application effects in actual production. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a quick hydraulic system for the grinding roller of a vertical roller mill, which can realize functions such as quick roll lifting, roll lowering, increasing or decreasing the loading pressure, increasing or decreasing the back pressure, etc., improves the operating efficiency, shortens the roll lifting time, reduces the failure rate, enhances the reliability, and has advanced configuration, high intelligence level, simple operation, and easy maintenance.

[0005] The present invention is implemented as follows. A quick hydraulic system for the grinding roller of a vertical roller mill includes an oil tank, a power source system, a rod chamber channel, a rodless chamber channel, and an oil tank circuit; the power source system is connected to the oil supply port of the oil tank, and the power source system includes two sets of parallel hydraulic power source systems; one set of hydraulic power source system is connected to the P port of the first electro-hydraulic directional valve, the A port of the first electro-hydraulic directional valve is connected to the rod chamber channel, and the B port of the first electro-hydraulic directional valve is connected to the rodless chamber channel; the other set of hydraulic power source system is connected to the P port of the second electro-hydraulic directional valve, the A port of the second electro-hydraulic directional valve is connected to the rod chamber channel, and the B port of the second electro-hydraulic directional valve is connected to the rodless chamber channel; the T ports of the first electro-hydraulic directional valve and the second electro-hydraulic directional valve are both connected to the oil tank circuit, and the oil tank circuit is connected to the oil return port of the oil tank;

[0006] The rod chamber channel is connected to the rodless chamber channel through a plurality of parallel solenoid valves, the rod chamber channel is connected to the oil tank circuit through the first solenoid valve group, and the rodless chamber channel is connected to the oil tank circuit through the second solenoid valve group;

[0007] The control method of the quick hydraulic system for the grinding roller of a vertical roller mill includes: roll lowering; roll lifting; increasing the loading pressure; decreasing the loading pressure; increasing the back pressure; decreasing the back pressure;

[0008] Among them, when the roll-lowering command is issued, the pressure of the rod chamber and the pressure of the rodless chamber of the given hydraulic cylinder are set, and the motor of one set of the hydraulic power source system is started at the normal speed. The hydraulic power source system delivers the oil through the corresponding electro-hydraulic directional valve to the rod chamber passage, allowing the oil to enter the rod chamber of the hydraulic cylinder and gradually establishing a pressure layer. At the same time, the solenoid valve group two in the rodless chamber passage is energized and started, discharging the oil in the rodless chamber of the hydraulic cylinder and relieving the pressure to the given pressure, thereby realizing roll lowering.

[0009] When the roll-raising command is issued, the two sets of hydraulic power source systems are started simultaneously. The motor of one set is started at the normal speed, and the motor of the other set is started at a high speed. The two sets of hydraulic power source systems deliver the oil through the corresponding electro-hydraulic directional valves to the rodless chamber passage respectively, allowing the oil to enter the rodless chamber of the hydraulic cylinder. At the same time, the solenoid valve group one and each solenoid valve in the rod chamber passage are continuously energized, quickly discharging and relieving the pressure of the oil in the rod chamber of the hydraulic cylinder to the rodless chamber of the hydraulic cylinder and the oil tank simultaneously. When the grinding roll reaches the high limit position, the roll raising is completed.

[0010] When the command to increase the loading pressure is issued, the motor of one set of the hydraulic power source system is started at the normal speed. The hydraulic power source system delivers the oil through the corresponding electro-hydraulic directional valve to the rod chamber passage, and this electro-hydraulic directional valve is energized for a short time, allowing the oil to enter the rod chamber of the hydraulic cylinder to realize an increase in the loading pressure.

[0011] When the command to decrease the loading pressure is issued, the solenoid valve group one in the rod chamber passage is temporarily energized, allowing the oil to be discharged from the rod chamber of the hydraulic cylinder to realize a decrease in the loading pressure.

[0012] When the command to increase the back pressure is issued, the motor of one set of the hydraulic power source system is started at the normal speed. The hydraulic power source system delivers the oil through the corresponding electro-hydraulic directional valve to the rodless chamber passage, and this electro-hydraulic directional valve is energized for a short time, allowing the oil to enter the rodless chamber of the hydraulic cylinder to realize an increase in the back pressure.

[0013] When the command to decrease the back pressure is issued, the solenoid valve group two in the rodless chamber passage is temporarily energized, allowing the oil to be discharged from the rodless chamber of the hydraulic cylinder to realize a decrease in the back pressure.

[0014] Preferably, the motor of one set of the hydraulic power source systems is a single-speed motor, and the motor of the other set of the hydraulic power source systems is a two-speed motor.

[0015] Preferably, each set of the hydraulic power source systems includes a high-pressure ball valve, an oil pump, a motor, a filter, a check valve one, and a pressure relief valve. The oil supply port of the oil tank is connected to the P port of the corresponding electro-hydraulic directional valve through the high-pressure ball valve, the oil pump, the filter, and the check valve one in sequence. The outlet of the check valve one is connected to the oil tank circuit through the pressure relief valve, and the motor controls the operation of the oil pump.

[0016] Further preferably, a proximity switch for monitoring the opening and closing state of the high-pressure ball valve is provided at the high-pressure ball valve.

[0017] Further preferably, the filter is provided with a bypass, and the bypass is provided with a check valve with a starting pressure.

[0018] Further preferably, a fine filter element is installed in the filter of one of the hydraulic power source systems.

[0019] The control method of the vertical roller mill roller quick hydraulic system further includes: circulating filtration; when a circulating filtration command is given, this hydraulic power source system with a fine filter element is started at a normal speed, so that the oil fluid enters the oil tank loop through the corresponding oil pump, filter, check valve 1, and the middle hole of the electro-hydraulic directional valve, and then returns to the oil tank, realizing the circulating filtration of the oil fluid.

[0020] Preferably, a check valve 2 is provided on the oil tank return line.

[0021] Preferably, when solenoid valve group 1 is temporarily energized or solenoid valve group 2 is temporarily energized, a certain solenoid ball valve in solenoid valve group 1 or a certain solenoid ball valve in solenoid valve group 2 is correspondingly controlled to be temporarily energized.

[0022] Further preferably, solenoid valve group 1 includes solenoid ball valve 1, solenoid ball valve 2, safety valve 1, and safety valve 2, and solenoid ball valve 1, solenoid ball valve 2, safety valve 1, and safety valve 2 are connected in parallel. The diameters of safety valve 1 and safety valve 2 are different.

[0023] Further preferably, solenoid valve group 2 includes solenoid ball valve 3, solenoid ball valve 4, safety valve 3, and safety valve 4, and solenoid ball valve 3, solenoid ball valve 4, safety valve 3, and safety valve 4 are connected in parallel. The diameters of safety valve 3 and safety valve 4 are different.

[0024] The advantages and positive effects of the present invention are:

[0025] The quick hydraulic system for the vertical roller mill of the present invention uses two sets of parallel hydraulic power source systems as the power source system, which can quickly supply the oil required by the system. And one of the oil pumps is equipped with a dual-speed motor. During the roller lifting process, the two pumps are started simultaneously, which can supply oil more quickly to form pressure, effectively shortening the roller lifting time. The power source system is provided with a proximity switch at the high-pressure ball valve, a bypass of the filter, a pressure relief valve and a series of other settings, which further ensures the stable operation of the system and improves the safety performance. The rod chamber channel is connected to the rodless chamber channel through multiple groups of solenoid valves and is connected to the oil tank circuit through solenoid valve group one. Through the dual channels, rapid oil discharge and pressure relief are achieved, shortening the flat pressure time to realize rapid roller lifting. The present invention can realize functions such as rapid roller lifting, lowering, increasing or decreasing the loading pressure, increasing or decreasing the back pressure, etc., improving the operation efficiency, shortening the roller lifting time, reducing the failure rate, and improving the reliability. It has advanced configuration, high intelligence, simple operation, safety and reliability, and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a schematic diagram of the quick hydraulic system for the vertical roller mill provided by the embodiment of the present invention.

[0027] In the figure: 1. Oil tank; 21. High-pressure ball valve; 22. Oil pump; 23. Motor; 24. Filter; 25. Check valve one; 26. Pressure relief valve; 27. Proximity switch; 31. Electro-hydraulic directional valve one; 32. Electro-hydraulic directional valve two; 4. Rod chamber channel; 5. Rodless chamber channel; 6. Oil tank circuit; 61. Check valve two; 7. Solenoid valve; 81. Electro-magnetic ball valve one; 82. Electro-magnetic ball valve two; 91. Safety valve one; 92. Safety valve two; 83. Electro-magnetic ball valve three; 84. Electro-magnetic ball valve four; 93. Safety valve three; 94. Safety valve four. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] Please refer to Figure 1 , an embodiment of the present invention provides a vertical roller mill roll quick hydraulic system, which includes an oil tank 1, a power source system, a rod chamber passage 4, a rodless chamber passage 5, and an oil tank circuit 6.

[0032] The power source system is connected to the oil supply port of the oil tank 1. The power source system includes two sets of parallel hydraulic power source systems, which can quickly provide the oil required by the system. One set of hydraulic power source system is connected to the P port of the first electro-hydraulic directional valve 31. The A port of the first electro-hydraulic directional valve 31 is connected to the rod chamber passage 4, and the B port of the first electro-hydraulic directional valve 31 is connected to the rodless chamber passage 5. The other set of hydraulic power source system is connected to the P port of the second electro-hydraulic directional valve 32. The A port of the second electro-hydraulic directional valve 32 is connected to the rod chamber passage 4, and the B port of the second electro-hydraulic directional valve 32 is connected to the rodless chamber passage 5. The T ports of the first electro-hydraulic directional valve 31 and the second electro-hydraulic directional valve 32 are both connected to the oil tank circuit 6, and the oil tank circuit 6 is connected to the oil return port of the oil tank 1. In this embodiment, check valves are provided at the A and B ports of the first electro-hydraulic directional valve 31 and the A and B ports of the second electro-hydraulic directional valve 32 to prevent the reverse flow of oil.

[0033] Each set of the hydraulic power source system includes a high-pressure ball valve 21, an oil pump 22, an electric motor 23, a filter 24, a first check valve 25, and a pressure relief valve 26. The oil supply port of the oil tank 1 is sequentially connected to the P port of the corresponding electro-hydraulic directional valve through the high-pressure ball valve 21, the oil pump 22, the filter 24, and the first check valve 25. The oil is pumped out of the oil tank 1 by the oil pump 22 and reaches the inlet of the corresponding electro-hydraulic directional valve through the high-pressure ball valve 21, the oil pump 22, the filter 24, and the first check valve 25. The flow and transportation of the oil are realized through the action of the electro-hydraulic directional valve, providing power for further performing corresponding action functions.

[0034] A proximity switch 27 for monitoring the opening and closing state of the high-pressure ball valve 21 is provided at the high-pressure ball valve 21. Through interlock control, it is ensured that the high-pressure ball valve 21 is in the open state when the oil pump 22 starts, which can effectively prevent the oil pump 22 from being damaged due to air suction.

[0035] The motor 23 controls the operation of the oil pump 22. The motor 23 of one set of the hydraulic power source system is a dual-speed motor 23. After the dual-speed motor 23 is started, the flow rate of the corresponding oil pump 22 can be doubled compared to the flow rate of the oil pump 22 of the other set of hydraulic power source systems, doubling the amount of oil instantly, quickly providing oil to form pressure, and effectively shortening the roll-lifting time. In this embodiment, motor M1 is a single-speed motor and motor M2 is a dual-speed motor.

[0036] The filter 24 is provided with a bypass, and the bypass is provided with a one-way valve with a starting pressure. When the pressure due to the blockage of the filter 24 exceeds the starting pressure of this one-way valve, this one-way valve starts to work and the bypass is connected, which can ensure rapid pressure relief when the filter 24 is blocked.

[0037] The filter 24 of one set of the hydraulic power source systems is equipped with a fine filtration filter element, so that the oil fluid is drawn out of the fuel tank 1, passes through the oil pump 22, the filter 24, the first one-way valve 25, and the middle hole of the corresponding electro-hydraulic directional valve and then flows back to the fuel tank 1 to complete the filtration. In this embodiment, a fine filtration filter element is installed in the filter 24 of the hydraulic power source system where motor M2 is located.

[0038] The outlet of the first one-way valve 25 is connected to the fuel tank circuit 6 through a pressure relief valve 26. The pressure relief valve 26 can ensure that when the pipeline is blocked or the valve group fails, resulting in an increase in the system pressure, the system pressure can be quickly relieved to below the maximum operating pressure, effectively protecting the pump, valves, and pipelines and improving the safety performance.

[0039] The rod chamber passage 4 is connected to the rodless chamber passage 5 through a plurality of parallel solenoid valves 7, which can realize the rapid release of the oil fluid in the rod chamber to the rodless chamber again, and further rapidly release the pressure in the rod chamber, so as to shorten the flat pressure relief time; in this embodiment, two parallel solenoid valves 7 are provided.

[0040] The rod chamber passage 4 is connected to the fuel tank circuit 6 through a first solenoid valve group. The first solenoid valve group includes an electromagnetic ball valve 81, an electromagnetic ball valve 82, a first safety valve 91, and a second safety valve 92. The electromagnetic ball valve 81, the electromagnetic ball valve 82, the first safety valve 91, and the second safety valve 92 are in parallel. The electromagnetic ball valve 81 and the electromagnetic ball valve 82 can realize the rapid release of the oil fluid in the rod chamber, and the first safety valve 91 and the second safety valve 92 can realize the rapid release of the oil pressure after the oil fluid in the rod chamber exceeds the maximum system pressure. The first safety valve 91 and the second safety valve 92 have different diameters and different pressure relief pressures. When the system pressure reaches 16 Mpa, the safety valve with a small diameter starts to relieve pressure, and when the system pressure exceeds 21 Mpa, the safety valve with a large diameter starts to relieve pressure.

[0041] The rodless cavity channel 5 is connected to the oil tank circuit 6 through the electromagnetic valve group 2, and the electromagnetic valve group 2 includes the electromagnetic ball valve 3 83, the electromagnetic ball valve 4 84, the safety valve 3 93 and the safety valve 4 94. The electromagnetic ball valve 3 83, the electromagnetic ball valve 4 84, the safety valve 3 93 and the safety valve 4 94 are connected in parallel. The electromagnetic ball valve 3 83 and the electromagnetic ball valve 4 84 can realize the rapid release of the oil in the rodless cavity, and the safety valve 3 93 and the safety valve 4 94 can realize the rapid release of the oil pressure of the rodless cavity after the oil exceeds the maximum pressure of the system. The safety valve 3 93 and the safety valve 4 94 have different diameters and different pressure relief pressures. When the system pressure reaches 16Mpa, the small diameter safety valve starts to relieve pressure, and when the system pressure exceeds 21Mpa, the large diameter safety valve starts to relieve pressure.

[0042] The oil tank circuit 6 is provided with a second check valve 61, which can prevent the oil in the oil tank 1 from flowing in the opposite direction. The oil tank circuit 6 of this embodiment is a double circuit, in which the power source system and two electro-hydraulic reversing valves are connected to one oil tank circuit, and the rod chamber channel 4 and the rodless chamber channel 5 are connected to the other oil tank circuit.

[0043] The specific implementation process of the present invention is as follows:

[0044] When the vertical mill is working normally, the motor 23 and each valve shall not be energized.

[0045] The roll-drop command is issued by setting the given rod chamber pressure and rodless chamber pressure of the hydraulic cylinder. At this time, the oil pump 22 corresponding to the motor M1 of the power source system is started, and this set of hydraulic power source system delivers the oil to the electro-hydraulic reversing valve 31. After the Y1 of the electro-hydraulic reversing valve 31 is energized, it is connected with the rod chamber channel 4, so that the oil enters the rod chamber of the hydraulic cylinder and gradually builds up a pressure layer; at the same time, the Y8 of the electromagnetic ball valve 3 83 and the Y9 of the electromagnetic ball valve 4 84 of the rodless chamber channel 5 are energized and started, and the oil in the rodless chamber of the hydraulic cylinder is discharged, and the pressure is relieved to the given pressure, thereby realizing the roll-drop function.

[0046] The roller lifting command starts the dual pumps of the power source system at the same time, the motor M1 starts normally, and the motor M2 starts at a high speed. The power source system delivers the oil to the electro-hydraulic reversing valve 1 31 and the electro-hydraulic reversing valve 2 32 respectively. The Y2 of the electro-hydraulic reversing valve 1 31 and the Y4 of the electro-hydraulic reversing valve 2 32 are energized at the same time and connected with the rodless cavity channel 5, so that the oil enters the rodless cavity of the hydraulic cylinder; at the same time, the Y5 of the electromagnetic ball valve 1 81 of the rod cavity channel 4, the Y6 of the electromagnetic ball valve 2 82, and the Y7 of each electromagnetic valve 7 are continuously energized, and the rod cavity of the hydraulic cylinder quickly drains oil and pressure to the rodless cavity and the oil tank 1 at the same time, quickly provides oil to form pressure, lifts the grinding roller to separate it from the material layer, and completes the roller lifting function when the grinding roller reaches the high limit.

[0047] Add the loading pressure command. The program sets the motor M1 corresponding to the oil pump 22 to start. After the oil reaches the electro-hydraulic reversing valve 1-31, Y1 of the electro-hydraulic reversing valve 1-31 is energized for a short time, and the oil enters the rod chamber of the hydraulic cylinder, realizing the add loading pressure command.

[0048] Reduce the loading pressure command. After the program sets Y6 of the electromagnetic ball valve 2-82 to be temporarily energized, the rod chamber passage 4 is connected to the tank circuit 6, and the oil is discharged from the rod chamber of the hydraulic cylinder, realizing the reduce loading pressure command.

[0049] Add the back pressure command. The program sets the motor M1 corresponding to the oil pump 22 to start. After the oil reaches the electro-hydraulic reversing valve 1-31, Y2 of the electro-hydraulic reversing valve 1-31 is energized for a short time, and the oil enters the non-rod chamber of the hydraulic cylinder, realizing the add back pressure command.

[0050] Reduce the back pressure command. After the program sets Y8 of the electromagnetic ball valve 3-83 to be temporarily energized, the non-rod chamber passage 5 is connected to the tank circuit 6, and the oil is discharged from the non-rod chamber of the hydraulic cylinder, realizing the reduce back pressure command.

[0051] Circulating filtration command. The program sets the motor M2 corresponding to the oil pump 22 to start normally at a low speed. The oil passes through the oil pump 22, filter 24, check valve 1-25, the middle hole of the electro-hydraulic reversing valve, and check valve 2-61 and returns to the oil tank 1, realizing the circulating filtration function of the oil.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid hydraulic system for the grinding roller of a vertical roller mill, characterized in that: It includes an oil tank, a power source system, a rod chamber channel, a rodless chamber channel, and an oil tank circuit; the power source system is connected to the oil supply port of the oil tank, and the power source system includes two sets of parallel hydraulic power source systems; one set of the hydraulic power source system is connected to the P port of the first electro-hydraulic directional valve, the A port of the first electro-hydraulic directional valve is connected to the rod chamber channel, and the B port of the first electro-hydraulic directional valve is connected to the rodless chamber channel; the other set of the hydraulic power source system is connected to the P port of the second electro-hydraulic directional valve, the A port of the second electro-hydraulic directional valve is connected to the rod chamber channel, and the B port of the second electro-hydraulic directional valve is connected to the rodless chamber channel; the T ports of the first electro-hydraulic directional valve and the second electro-hydraulic directional valve are both connected to the oil tank circuit, and the oil tank circuit is connected to the oil return port of the oil tank; The rod chamber channel is connected to the rodless chamber channel through multiple parallel solenoid valves, the rod chamber channel is connected to the oil tank circuit through the first solenoid valve group, and the rodless chamber channel is connected to the oil tank circuit through the second solenoid valve group; The control method of the vertical roller mill roller fast hydraulic system includes: lowering the roller; lifting the roller; increasing the loading pressure; reducing the loading pressure; increasing the back pressure; reducing the back pressure; Among them, when a roller lowering command is issued, the rod chamber pressure and the rodless chamber pressure of the given hydraulic cylinder are set, and the motor of one set of the hydraulic power source system is started at a normal speed. The hydraulic power source system delivers the oil through the corresponding electro-hydraulic directional valve to the rod chamber channel, so that the oil enters the rod chamber of the hydraulic cylinder, and a pressure layer is gradually established; at the same time, the second solenoid valve group of the rodless chamber channel is energized and started, and the oil in the rodless chamber of the hydraulic cylinder is discharged, and the pressure is relieved to the given pressure, so as to realize roller lowering; When a roller lifting command is issued, the two sets of hydraulic power source systems are started simultaneously. The motor of one set is started at a normal speed, and the motor of the other set is started at a high speed. The two sets of hydraulic power source systems deliver the oil through the corresponding electro-hydraulic directional valves to the rodless chamber channel, so that the oil enters the rodless chamber of the hydraulic cylinder; at the same time, the first solenoid valve group of the rod chamber channel and each solenoid valve are continuously energized, and the oil in the rod chamber of the hydraulic cylinder is quickly drained and depressurized to the rodless chamber of the hydraulic cylinder and the oil tank at the same time. When the roller reaches the high limit position, the roller lifting is completed; When an increasing loading pressure command is issued, the motor of one set of the hydraulic power source system is started at a normal speed. The hydraulic power source system delivers the oil through the corresponding electro-hydraulic directional valve to the rod chamber channel, and this electro-hydraulic directional valve is energized for a short time, so that the oil enters the rod chamber of the hydraulic cylinder, and the increasing loading pressure is realized; When a reducing loading pressure command is issued, the first solenoid valve group of the rod chamber channel is temporarily energized, so that the oil is discharged from the rod chamber of the hydraulic cylinder, and the reducing loading pressure is realized; When an increasing back pressure command is issued, the motor of one set of the hydraulic power source system is started at a normal speed. The hydraulic power source system delivers the oil through the corresponding electro-hydraulic directional valve to the rodless chamber channel, and this electro-hydraulic directional valve is energized for a short time, so that the oil enters the rodless chamber of the hydraulic cylinder, and the increasing back pressure is realized; When a reducing back pressure command is issued, the second solenoid valve group of the rodless chamber channel is temporarily energized, so that the oil is discharged from the rodless chamber of the hydraulic cylinder, and the reducing back pressure is realized.

2. The quick hydraulic system for the vertical roller mill roller according to claim 1, characterized in that: One of the motors of the hydraulic power source system is a single-speed motor, and the motor of the other hydraulic power source system is a two-speed motor.

3. The vertical roller mill roller quick hydraulic system according to claim 1, characterized in that: Each hydraulic power source system includes a high-pressure ball valve, an oil pump, a motor, a filter, a check valve I, and a pressure relief valve. The oil supply port of the fuel tank is connected to the P port of the corresponding electro-hydraulic directional valve through the high-pressure ball valve, the oil pump, the filter, and the check valve I in sequence. The outlet of the check valve I is connected to the fuel tank circuit through the pressure relief valve, and the motor controls the operation of the oil pump.

4. The vertical roller mill roll quick hydraulic system according to claim 2, characterized in that: A proximity switch for monitoring the opening and closing state of the high-pressure ball valve is provided at the high-pressure ball valve.

5. The vertical roller mill roll quick hydraulic system according to claim 2, characterized in that: The filter is provided with a bypass, and the bypass is provided with a check valve with a starting pressure.

6. The vertical roller mill roll quick hydraulic system according to claim 2, characterized in that: The filter of one of the hydraulic power source systems is equipped with a fine filter element; The control method of the vertical roller mill roll quick hydraulic system further includes: circulating filtration; when a circulating filtration command is given, start the hydraulic power source system with the fine filter element at normal speed, so that the oil passes through the corresponding oil pump, filter, check valve I, and the middle hole of the electro-hydraulic directional valve, enters the fuel tank circuit and then returns to the fuel tank to realize the circulating filtration of the oil.

7. The quick hydraulic system for the vertical roller mill roller according to claim 1, characterized in that: A check valve II is provided on the fuel tank circuit.

8. The vertical roller mill roller quick hydraulic system according to claim 1, characterized in that: When solenoid valve group I is temporarily energized or solenoid valve group II is temporarily energized, a certain electromagnetic ball valve in solenoid valve group I or a certain electromagnetic ball valve in solenoid valve group II is correspondingly controlled to be temporarily energized.

9. The vertical roller mill roll quick hydraulic system according to claim 8, characterized in that: The solenoid valve group I includes an electromagnetic ball valve I, an electromagnetic ball valve II, a safety valve I, and a safety valve II. The electromagnetic ball valve I, the electromagnetic ball valve II, the safety valve I, and the safety valve II are connected in parallel; the diameters of the safety valve I and the safety valve II are different.

10. The vertical roller mill roller quick hydraulic system according to claim 8, characterized in that: The solenoid valve group II includes an electromagnetic ball valve III, an electromagnetic ball valve IV, a safety valve III, and a safety valve IV. The electromagnetic ball valve III, the electromagnetic ball valve IV, the safety valve III, and the safety valve IV are connected in parallel; the diameters of the safety valve III and the safety valve IV are different.

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