Hydraulic station system of coal mill

Abstract

The utility model discloses a coal mill hydraulic station system which comprises an oil tank, an oil cylinder, an oil pump, an overflow valve and an oil way pipeline, the oil way pipeline comprises a header pipe, a branch pipe and a first oil return pipeline, a proportional valve is installed on the oil return pipeline, an oil return opening of the proportional valve is communicated with the oil tank through a second oil return pipeline, and the oil return pipeline is communicated with the oil tank. A first pressure sensor is installed on the branch pipe, and a second pressure sensor is installed on the main pipe. According to the hydraulic station system of the coal mill, the proportional valve is arranged on the oil return pipeline, so that the loading pressure on the branch pipe can be accurately controlled, and when different iron-making coal injection mill grinding rollers need different loading pressures, the loading pressure on the branch pipe can be accurately controlled by setting different set values of the loading pressure on the branch pipe. And the loading pressure is adaptively adjusted, so that the abrasion of equipment is greatly reduced, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverized coal injection for ironmaking, in particular to a hydraulic station system for a coal mill. Background Art

[0002] To realize the lifting of the grinding rollers of a pulverized coal injection mill for ironmaking, a hydraulic station is equipped for the pulverized coal injection mill. The hydraulic station has a system pressure and a loading pressure. The system pressure is the overall pressure of the pipeline after the hydraulic station pressurizes, and the loading pressure is the branch pipe pressure for controlling the lifting of the grinding rollers. The traditional hydraulic station system of the pulverized coal injection mill is the same as that of an ordinary hydraulic station. As Figure 1 shown, the system pressure on the main pipe 102 is controlled by adjusting the pressure of the overflow valve 101 of the hydraulic station, so as to realize the lifting of the grinding rollers. This kind of hydraulic station system of the pulverized coal injection mill has the following disadvantages:

[0003] 1. When the lifting of the grinding rollers is controlled only by adjusting the system pressure with the overflow valve, the pressurizing pump 103 of the hydraulic station needs to be in operation all the time, which not only consumes a large amount of energy, but also causes the overflow valve 101 to be in the working state for a long time and act frequently, and is extremely easy to be damaged;

[0004] 2. Different lifting rollers require different loading pressures. The traditional hydraulic station system of the pulverized coal injection mill only has one overflow valve 101 to control the system pressure, and no separate loading pressure control valve is designed. It is impossible to provide different loading pressures according to the requirements of the lifting of the grinding rollers, and the accurate control of the loading pressure cannot be achieved, resulting in an increase in equipment wear and shortening the service life of the equipment;

[0005] 3. The entire hydraulic station of the pulverized coal injection mill only has one system pressure control overflow valve 101. Once this overflow valve 101 fails, the system pressure of the entire hydraulic station system cannot be controlled, which will affect normal production. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a hydraulic station system for a coal mill.

[0007] The technical solution for achieving the purpose of the present utility model is: a hydraulic station system for a coal mill, including an oil tank, an oil cylinder, an oil pump, a relief valve, and an oil pipeline. The oil pipeline includes a main pipe, a branch pipe, and a first oil return pipeline. The first end of the main pipe is communicated with the oil tank, the second end of the main pipe is communicated with the first end of the branch pipe, the second end of the branch pipe is communicated with the oil cylinder, the first end of the oil return pipeline is communicated with the second end of the main pipe, the second end of the oil return pipeline is communicated with the oil tank, the oil pump is installed on the main pipe, a check valve is also installed on the main pipe, and the relief valve is installed on the oil return pipeline; a proportional valve is installed on the oil return pipeline, the oil return port of the proportional valve is communicated with the oil tank through a second oil return pipeline, a first pressure sensor is installed on the branch pipe, the first pressure sensor is located between the proportional valve and the oil cylinder, a second pressure sensor is installed on the main pipe, and the second pressure sensor, the first pressure sensor, the proportional valve, and the oil pump are respectively electrically connected to a control unit.

[0008] Further, the second pressure sensor is located between the oil pump and the second end of the main pipe.

[0009] Further, the check valve is a check valve that conducts in the direction from the first end of the main pipe to the second end of the main pipe and cuts off in the direction from the second end of the main pipe to the first end of the main pipe.

[0010] Further, the check valve is located between the oil tank and the oil pump.

[0011] Further, the control unit is a PLC controller or an MCU controller.

[0012] For the hydraulic station system of the coal mill of the present utility model, by installing the proportional valve on the oil return pipeline and the first pressure sensor on the branch pipe, the first pressure sensor can sense the loading pressure on the branch pipe. According to the loading pressure on the branch pipe sensed by the first pressure sensor, the control unit can control the proportional valve. Furthermore, after the loading pressure on the branch pipe is adjusted by PID, not only can it be accurately controlled, but also when the required loading pressures for different grinding rollers of the ironmaking pulverized coal mill are different, the loading pressure can be adaptively adjusted by setting different set values of the loading pressures on different branch pipes. In this way, the loading pressure on the branch pipe can be flexibly adjusted for different grinding rollers, and the adjustment control is accurate, which can greatly reduce equipment wear and extend the service life of the equipment.

[0013] The hydraulic station system of the coal mill of the present utility model installs the second pressure sensor on the main pipe. After the second pressure sensor senses the system pressure on the main pipe, the control unit can flexibly control the oil pump. By controlling the oil pump, while the system pressure on the main pipe can be within the working range, the working burdens of the oil pump and the overflow valve can also be reduced, avoiding the situation that the oil pump and the overflow valve are always in the running state, reducing energy consumption, reducing the action frequency of the overflow valve, and preventing the overflow valve from being damaged.

[0014] In addition, for the hydraulic station system of the coal mill of the present utility model, in addition to the overflow valve, the system pressure on the main pipe can also be controlled by starting and stopping the oil pump. There are multiple control paths and it does not rely on a single overflow valve control. Even if the overflow valve is damaged, the system can still be controlled by starting and stopping the oil pump, and the situation where the normal production is affected due to the overflow valve failure will not occur. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of a traditional pulverized coal injection mill hydraulic station system;

[0016] Figure 2 is a schematic structural diagram of the hydraulic station system of the coal mill of the present utility model;

[0017] Figure 3 is a schematic control structural diagram of the hydraulic station system of the coal mill of the present utility model. Detailed Embodiment

[0018] The following will make a detailed description of the preferred embodiment of the hydraulic station system of the coal mill of the present utility model in conjunction with the drawings:

[0019] Such as Figure 2 and Figure 3As shown in the figure, a hydraulic station system for a coal mill includes an oil tank 1, an oil cylinder 2, an oil pump 3, a relief valve 4, and an oil pipeline. The oil pipeline includes a main pipeline 51, a branch pipeline 52, and a first oil return pipeline 53. The first end 511 of the main pipeline 51 is connected to the oil tank 1, the second end 512 of the main pipeline 51 is connected to the first end 521 of the branch pipeline 52, the second end 522 of the branch pipeline 52 is connected to the oil cylinder 2, the first end 531 of the oil return pipeline 53 is connected to the second end 512 of the main pipeline 51, and the second end 532 of the oil return pipeline 53 is connected to the oil tank 1. The oil pump 3 is installed on the main pipeline 51, a check valve 6 is also installed on the main pipeline 51, and the relief valve 4 is installed on the oil return pipeline 53. A proportional valve 7 is installed on the oil return pipeline 53. The oil return port 71 of the proportional valve 7 is connected to the oil tank 1 through a second oil return pipeline 54. A first pressure sensor 81 is installed on the branch pipeline 52, and the first pressure sensor 81 is located between the proportional valve 7 and the oil cylinder 2. A second pressure sensor 82 is installed on the main pipeline 51. The second pressure sensor 82, the first pressure sensor 81, the proportional valve 7, and the oil pump 3 are all electrically connected to a control unit 9 respectively.

[0020] For the hydraulic station system of the coal mill of the present utility model, the oil pump 3 serves as the power for refueling the oil cylinder 2 from the oil tank 1; the check valve 6 is used to control the oil flow direction; the relief valve 4 serves as a regulating valve for the system pressure on the main pipeline 51; the proportional valve 7 serves as a regulating valve for the loading pressure on the branch pipeline 52; the first pressure sensor 81 is used to sense the loading pressure on the branch pipeline 52 in real time; the second pressure sensor 82 is used to sense the system pressure on the main pipeline 51 in real time; the oil cylinder 2 moves up and down to drive the grinding roller of the ironmaking pulverized coal mill to move up and down.

[0021] For the hydraulic station system of the coal mill of the present utility model, when the grinding roller of the ironmaking pulverized coal mill needs to be raised, the oil pump 3 operates to pump the oil in the oil tank 1 into the oil cylinder 2 successively along the main pipeline 51 and the branch pipeline 52. The oil enters the oil cylinder 2, and the pressure gradually increases, lifting the grinding roller of the pulverized coal mill. During the lifting process, not only can the loading pressure on the branch pipeline 52 be adjusted to achieve precise control, but also the system pressure on the main pipeline 51 can be adjusted according to the working conditions to avoid the long-term operation of the oil pump 3 and the relief valve 4.

[0022] When adjusting the loading pressure on the branch pipe 52, specifically, the first pressure sensor 81 senses the loading pressure on the branch pipe 52 in real time and sends the sensed loading pressure signal to the control unit 9. The control unit 9 controls the proportional valve 7 according to the loading pressure on the branch pipe 52 sensed by the first pressure sensor 81. If the loading pressure on the branch pipe 52 sensed by the first pressure sensor 81 is greater than the set value of the loading pressure on the branch pipe 52, the control unit 9 controls the proportional valve 7 to increase the flow rate returning to the fuel tank 1 along the second oil return pipe 54 through the oil return port 71 of the proportional valve 7, and the loading pressure on the branch pipe 52 decreases. If the loading pressure on the branch pipe 52 sensed by the first pressure sensor 81 is less than the set value of the loading pressure on the branch pipe 52, the control unit 9 controls the proportional valve 7 to reduce the flow rate returning to the fuel tank 1 along the second oil return pipe 54 through the oil return port 71 of the proportional valve 7, and the loading pressure on the branch pipe 52 increases. In this way, the PID adjustment of the loading pressure on the branch pipe 52 is realized, and the loading pressure on the branch pipe 52 can be accurately controlled.

[0023] When adjusting the system pressure on the main pipe 51, specifically, the second pressure sensor 82 senses the system pressure on the main pipe 51 in real time and sends the sensed system pressure signal to the control unit 9. The control unit 9 controls the oil pump 3 according to the system pressure on the main pipe 51 sensed by the second pressure sensor 82. When the system pressure on the main pipe 51 sensed by the second pressure sensor 82 is greater than the pressure value of the overflow valve 4, the control unit 9 controls the oil pump 3 to stop, so that the system pressure on the main pipe 51 no longer increases within the working range. When the system pressure on the main pipe 51 sensed by the second pressure sensor 82 is less than the set value of the loading pressure on the branch pipe 52, the control unit 9 controls the oil pump 3 to work, so that the system pressure on the main pipe 51 increases within the working range to supply oil to the branch pipe 52. In this way, the control of the system pressure on the main pipe 51 is realized, while reducing the operation of the oil pump 3 and the overflow valve 4 within the working range.

[0024] The hydraulic station system of the coal mill of the present utility model installs the proportional valve 7 on the oil return pipeline 53 and installs the first pressure sensor 81 on the branch pipe 52, so that the first pressure sensor 81 can sense the loading pressure on the branch pipe 52. According to the loading pressure on the branch pipe 52 sensed by the first pressure sensor 81, the control unit 9 can control the proportional valve 7. Further, after the loading pressure on the branch pipe 52 is adjusted by PID, not only can it be accurately controlled, but also when the required loading pressures of different coal mill rollers in ironmaking pulverized coal injection are different, the loading pressure can be adaptively adjusted by setting the set values of the loading pressures on different branch pipes 52. In this way, the loading pressure on the branch pipe 52 can be flexibly adjusted for different rollers, and the adjustment control is accurate, which can greatly reduce equipment wear and extend the service life of the equipment.

[0025] The hydraulic station system of the coal mill of the present utility model installs the second pressure sensor 82 on the main pipe 51. After the second pressure sensor 82 senses the system pressure on the main pipe 51, the control unit 9 can flexibly control the oil pump 3. By controlling the oil pump 3, the system pressure on the main pipe 51 can be within the working range, and at the same time, the working burdens of the oil pump 3 and the overflow valve 4 can be reduced, avoiding the oil pump 3 and the overflow valve 4 from being in the running state all the time, reducing energy consumption, reducing the action frequency of the overflow valve 4, and preventing the overflow valve 4 from being damaged.

[0026] In addition, for the hydraulic station system of the coal mill of the present utility model, in addition to the overflow valve 4, the system pressure on the main pipe 51 can also be controlled by starting and stopping the oil pump 3. There are many control ways and it does not rely on the single control of the overflow valve 4. Even if the overflow valve 4 is damaged, it can be controlled by starting and stopping the oil pump 3, and the situation that the normal production is affected due to the failure of the overflow valve 4 will not occur.

[0027] For the hydraulic station system of the coal mill of the present utility model, preferably, the second pressure sensor 82 is located between the oil pump 3 and the second end 512 of the main pipe 51.

[0028] For the hydraulic station system of the coal mill of the present utility model, the one-way valve 6 is a one-way valve that conducts from the first end 511 of the main pipe 51 to the second end 512 of the main pipe 51 and cuts off from the second end 512 of the main pipe 51 to the first end 511 of the main pipe 51.

[0029] For the hydraulic station system of the coal mill of the present utility model, preferably, the one-way valve 6 is located between the oil pump 3 and the second end 512 of the main pipe 51.

[0030] The hydraulic station system of the coal mill of the present utility model, the overflow valve 4, the one-way valve 6, the proportional valve 7, the first pressure sensor 81, the second pressure sensor 82, and the control unit 9 are all existing structures. Among them, the control unit 9 can be a PLC controller or an MCU controller. In this regard, the present utility model will not elaborate further.

[0031] For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can also be made, and all should be regarded as falling within the protection scope of the present utility model.

Claims

1. A coal mill hydraulic station system, characterized in that: It includes a fuel tank, an oil cylinder, an oil pump, a relief valve and an oil pipeline. The oil pipeline includes a main pipe, a branch pipe and a first oil return pipeline. The first end of the main pipe is communicated with the fuel tank, the second end of the main pipe is communicated with the first end of the branch pipe, the second end of the branch pipe is communicated with the oil cylinder, the first end of the oil return pipeline is communicated with the second end of the main pipe, the second end of the oil return pipeline is communicated with the fuel tank, the oil pump is installed on the main pipe, a check valve is also installed on the main pipe, and the relief valve is installed on the oil return pipeline; a proportional valve is installed on the oil return pipeline, the oil return port of the proportional valve is communicated with the fuel tank through a second oil return pipeline, a first pressure sensor is installed on the branch pipe, the first pressure sensor is located between the proportional valve and the oil cylinder, a second pressure sensor is installed on the main pipe, and the second pressure sensor, the first pressure sensor, the proportional valve and the oil pump are respectively electrically connected to a control unit.

2. The coal mill hydraulic station system according to claim 1, characterized in that: The second pressure sensor is located between the oil pump and the second end of the main pipe.

3. The coal mill hydraulic station system according to claim 1, characterized in that: The check valve is a check valve that conducts in the direction from the first end of the main pipe to the second end of the main pipe and cuts off in the direction from the second end of the main pipe to the first end of the main pipe.

4. The coal mill hydraulic station system according to claim 1, wherein: The check valve is located between the fuel tank and the oil pump.

5. The coal mill hydraulic station system according to claim 1, characterized in that: The control unit is a PLC controller or an MCU controller.

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