Constant pressure control device for thin oil station of oil film bearing of rolling mill

Abstract

The utility model discloses a constant pressure control device for a thin oil station of a rolling mill oil film bearing. The rolling mill oil film bearing (6) is communicated with a thin oil supply station (5) through a thin oil supply pipeline (8); a pneumatic control valve (4) is arranged between an oil supply pipe and an oil return pipe of the thin oil supply pipeline (8); and the pneumatic control valve (4) is used for adjusting the flow and the oil pressure of the thin oil supply pipeline (8). By the adoption of the technical scheme, the pressure, temperature, flow and the like of a rolling mill bearing oil film system are well controlled, and the working state of an oil film bearing is more stable; the oil leakage amount is reduced, a large amount of lubricating oil is saved, the system operation stability is improved, and the service life of an oil film bearing is prolonged; when the pressure is stable, the oil quantity compensation control of the oil film is stable, and stable operation of rolling of the rolling mill is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel rolling mill equipment in metallurgical industrial production, and more specifically, relates to a constant pressure control device for a thin oil station of an oil film bearing of a rolling mill. Background Art

[0002] The rolling mill oil film bearing lubrication system is used to provide lubricating oil to the rolling mill oil film bearings to establish the oil film required for dynamic pressure lubrication and cool the bearings at the same time. It is mainly composed of an oil tank unit, a pump unit, a filter unit, a heating device, a cooling device, a PLC control system, on-site detection components, a pressure regulating unit, etc. It is an important link in whether the rolling mill oil film bearings can work normally.

[0003] Defects of the prior art:

[0004] 1. The instant flow required by the oil film bearing does not match the system supply flow, resulting in high energy consumption;

[0005] 2. The oil supply pressure of the thin oil station is unstable and changes with the speed of the rolling mill, which is not conducive to the oil film lubrication of the support roller and causes great damage to the bearing;

[0006] 3. The oil supply pressure of the oil station cannot be adjusted, and remote control and pressure regulation are not possible;

[0007] 4. The instability of oil supply pressure and the increase in pressure will also lead to seal failure and oil leakage.

[0008] The following search results were obtained by searching the existing published technical literature using keywords such as "rolling mill; oil film bearing; oil; pressure; control":

[0009] 1. Chinese patent document: "Intelligent rolling mill oil film bearing", patent (application) number: 200910044845.X, the technical solution recorded is:

[0010] "The intelligent rolling mill oil film bearing includes a rolling mill oil film bearing, a small displacement sensor is radially installed on the outer end of which, the signal lead wire of the displacement sensor is led out of the bearing box containing the rolling mill oil film bearing, and is connected to the secondary instrument through an external preamplifier; if the support roller and the roller bearing are installed in pairs with intelligent positioning, the concentricity of the two roller bearings can be determined through the data of the oil film thickness of the bearings on both sides;"

[0011] The technical effects recorded are:

[0012] "It can realize online detection and monitoring of rolling mill oil film thickness; it can realize online detection of bearing installation accuracy and improve the quality of rolled products; combined with the theoretical calculation results of rolling mill oil film bearing oil film thickness, it can evaluate the service life of rolling mill oil film bearings; the sensor is protected and the signal line can be easily led out of the bearing box; the sensor is installed close to the end of the bearing, where the oil film pressure of the bearing is relatively small, close to the pressure outside the bearing end, and easy to seal; it is suitable for rolling mill oil film bearings with wall thickness greater than 20MM."

[0013] 2. Chinese patent document: "A two-roll mill using an adjustable pressure oil film bearing", patent (application) number: 202121965895.4, the technical solution recorded is:

[0014] "A two-roll rolling mill using an adjustable pressure oil film bearing comprises a rolling mill roll housing, a rolling mill shaft, an adjustable pressure oil film bearing and an eccentric bearing sleeve, wherein the eccentric bearing sleeve is fixedly arranged in the rolling mill roll housing; the adjustable pressure oil film bearing is fixedly fitted in the eccentric bearing sleeve, and the rolling mill shaft is supported by the adjustable pressure oil film bearing; a circulating oil circuit is arranged on the eccentric bearing sleeve for circulating the oil in the divergent zone and the convergent zone of the adjustable pressure oil film bearing, and the circulating oil circuit can also communicate with an external oil circuit";

[0015] The technical effects recorded are:

[0016] "The adjustable pressure oil film bearing can adjust the oil pressure in the convergence zone and the divergence zone, so as to balance the oil pressure with the pressure on the roll shaft, ensuring that the roll shaft will not rub against the bearing sleeve, thereby ensuring the normal production of the rolling mill and increasing the service life of the rolling mill."

[0017] However, the actual situation is that the technical solutions recorded in the above-mentioned existing public documents have failed to solve the problems and defects of the rolling mill oil film bearings in the prior art, namely, "the required flow rate does not match the system supply flow rate, the energy consumption is high; the oil supply pressure is unstable, which causes great damage to the bearings; the oil supply pressure cannot be adjusted; remote control and pressure regulation are not possible; the pressure increase causes the seal to fail and oil leakage is easy." Utility Model Content

[0018] The utility model provides a constant pressure control device for a thin oil station of an oil film bearing of a rolling mill, and its purpose is to make the working state of the oil film bearing more stable.

[0019] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0020] The utility model discloses a constant pressure control device for a thin oil station of an oil film bearing of a rolling mill, wherein the oil film bearing of the rolling mill is connected to the thin oil supply station through a thin oil supply pipeline; a pneumatic regulating valve is arranged between the oil supply pipe and the oil return pipe of the thin oil supply pipeline; the pneumatic regulating valve regulates the flow rate and oil pressure of the thin oil supply pipeline.

[0021] The control device is provided with a PLC controller; the electric control unit of the pneumatic regulating valve is connected with the PLC controller via a control signal circuit.

[0022] The control device is provided with an air compression station, and the control air cavity of the pneumatic regulating valve is connected with the air compression station through a pneumatic circuit.

[0023] An air filter is arranged on the air inlet of the air compression station.

[0024] An oil circuit signal detection device is arranged on the oil supply pipe of the thin oil supply pipeline, and the signal output circuit of the pressure detection device is connected to the PLC controller.

[0025] The oil circuit signal detection device comprises an oil pressure sensor; the model of the oil pressure sensor is hydac344-03-016-y00.

[0026] The control device is provided with an alarm; the alarm is connected to the PLC controller through an alarm circuit.

[0027] The control device is provided with an HMI human-machine interface; the HMI human-machine interface is connected with the PLC controller through a signal circuit.

[0028] A control computer is arranged on the operation console of the rolling mill for displaying the HMI human-machine interface and interacting with the human-machine interface.

[0029] The model of the pneumatic regulating valve is pa-n540.

[0030] The utility model adopts the above technical scheme, so that the pressure, temperature, flow rate, etc. of the oil film system of the rolling mill bearing are well controlled, making the working state of the oil film bearing more stable; reducing oil leakage, saving a large amount of lubricating oil, improving the system operation stability, and extending the service life of the oil film bearing; while the pressure is stable, the oil film oil volume compensation control is stable, ensuring the stable operation of the rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The contents shown in the attached drawings and the symbols in the drawings are briefly described as follows:

[0032] Figure 1 This is a schematic diagram of the oil circuit structure of the control device of the utility model;

[0033] Figure 2 It is a schematic diagram of the control module and control principle of the utility model.

[0034] The markings in the figure are:

[0035] 1. HMI human-machine interface, 2. PLC controller, 3. Alarm, 4. Pneumatic control valve, 5. Thin oil supply station, 6. Oil film bearing, 7. Oil circuit signal detection device, 8. Thin oil supply pipeline, 9. Air compressor station, 10. Air filter. DETAILED DESCRIPTION

[0036] The specific implementation methods of the utility model are further explained in detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the utility model.

[0037] like Figure 1 , Figure 2 The structure of the utility model shown is a constant pressure control device for a thin oil station of a rolling mill oil film bearing. The rolling mill oil film bearing 6 is connected to the thin oil supply station 5 through a thin oil supply pipeline 8.

[0038] In order to solve the problems existing in the prior art and overcome its defects, and to achieve the invention purpose of making the working state of the oil film bearing more stable, the technical solution adopted by the utility model is:

[0039] like Figure 1 , Figure 2 As shown, in the utility model, the constant pressure control device of the thin oil station of the rolling mill oil film bearing is provided with a pneumatic regulating valve 4 between the oil supply pipe and the return pipe of the thin oil supply pipe 8; the pneumatic regulating valve 4 regulates the flow rate and oil pressure of the thin oil supply pipe 8.

[0040] The utility model improves the existing technology and redesigns the pipeline and pressure control device. The device is implemented to solve the following technical difficulties:

[0041] 1. The oil pipeline of the thin oil station is renovated and a pneumatic regulating valve is added;

[0042] 2. Increase the air source to control the pneumatic regulating valve;

[0043] 3. Add pressure detection points;

[0044] 4. Add a control device PLC to control the constant pressure device;

[0045] 5. Add fault alarm function;

[0046] 6. Add a control computer to display the status and remotely control the oil supply pressure;

[0047] 7. Lay out the network to connect the on-site PLC and control computer.

[0048] The utility model is specifically implemented in the following ways:

[0049] 1. If Figure 1 As shown:

[0050] The oil pipeline of the thin oil supply station 5 is modified by adding an oil return pipeline near the oil film bearing 6 of the original oil supply pipeline, and installing a pneumatic regulating valve 4 in the middle of the oil return pipeline; the model of the pneumatic regulating valve 4 is pa-n540.

[0051] like Figure 2 As shown:

[0052] 2. The control device is provided with a PLC controller 2; the electric control unit of the pneumatic regulating valve 4 is connected to the PLC controller 2 via a control signal circuit;

[0053] The PLC controller 2 is a Siemens S7-300 PLC controller; the host computer provides an HMI human-machine interface 1, and the software used is Siemens wincc 7.0.

[0054] The PLC controller 2 is installed on site at the thin oil supply station 5, and the control program is compiled and debugged.

[0055] 3. The control device is provided with an air compression station 9, and the control air cavity of the pneumatic regulating valve 4 is connected to the air compression station 9 through a pneumatic circuit.

[0056] An air filter 10 is provided on the air inlet of the air compression station 9 .

[0057] The air compressor station 9 provides compressed air and is further provided with a filtering device, namely an air filter 10 , to provide a control air source for the pneumatic regulating valve 4 .

[0058] 4. An oil circuit signal detection device 7 is provided on the oil supply pipe of the thin oil supply pipe 8 , and a signal output circuit of the oil circuit signal detection device 7 is connected to the PLC controller 2 .

[0059] The oil circuit signal detection device 7 detects the pressure, temperature, flow rate, etc. of the oil film system; wherein, the oil circuit signal detection device 7 includes an oil pressure sensor; the model of the oil pressure sensor is hydac344-03-016-y00; the oil circuit signal detection device 7 abnormally includes a temperature sensor and a flow meter.

[0060] 5. The control device is provided with an alarm 3; the alarm 3 is connected to the PLC controller 2 via an alarm circuit.

[0061] The PLC controller 2 converts the on-site fault detection information or other unstable and abnormal operation status information into alarm information and sends it to the alarm 3 and feeds it back to the computer's HMI human-machine interface 1, prompting the operator of the system operation status and fault information so that he can take corresponding measures.

[0062] 6. The control device is provided with an HMI human-machine interface 1; the HMI human-machine interface 1 is connected to the PLC controller 2 through a signal circuit.

[0063] A control computer is arranged on the operation console of the rolling mill for displaying the HMI human-machine interface 1 and for human-machine interaction.

[0064] A control computer is installed on the operating table of the rolling mill for displaying the HMI human-machine interface 1; the wincc screen is edited, and the screen functions of the HMI human-machine interface 1 include: constant pressure control device status display, pressure setting, actual pressure display, mode button; among which, the mode button includes off, manual, automatic and other modes; so that it has remote control capability.

[0065] The beneficial effects achieved by the utility model using the above technical solution are:

[0066] The pressure, temperature, flow rate, etc. of the rolling mill oil film system are all well controlled, reducing the number of oil leakages, saving a large amount of lubricating oil, improving the system operation stability, extending the service life of the oil film bearings, stabilizing the pressure and the oil film compensation control, and ensuring stable rolling of the rolling mill.

[0067] A design of a constant pressure control device for a lubricating oil station, the system includes: a lubricating oil station, a PLC controller, a pressure sensor, an HMI screen computer (for display and remote control) and a pneumatic regulating valve, a bypass circuit. As shown in the system structure diagram.

[0068] Constant pressure control principle of oil film bearing thin oil station of the utility model Figure 2 The control method of this system is:

[0069] The thin oil supply station 5 is started by the operating table computer HMI human-machine interface 1, and the pressure required for lubrication of the oil film bearing 6 is set at the same time, which is generally set to about 6.0 bar;

[0070] After the thin oil supply station 5 is started, it starts to supply oil to the oil film bearing 6, and the pressure of the thin oil supply station 5 is adjusted to about 8.5 bar;

[0071] When the oil from the thin oil supply station 5 reaches the oil film bearing 6, the pressure sensor in the oil circuit signal detection device 7 at the end of the oil film bearing 6 starts to detect the thin oil pressure and transmits the pressure value to the PLC controller 2;

[0072] The PLC controller 2 performs calculations according to a preset program, and outputs a signal to control the pneumatic regulating valve 4 to open or close the valve, and adjusts the size of the valve port according to actual needs. The excess oil flows back to the oil tank through the bypass, so that the pressure supplied to the oil film bearing 6 is always maintained at about 6.0 bar, achieving constant pressure control;

[0073] At the same time, the PLC controller 2 converts the on-site detection information into alarm information, sends it to the alarm 3, and feeds it back to the HMI human-machine interface 1 of the computer.

[0074] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A constant pressure control device for a thin oil station of a rolling mill oil film bearing, wherein the rolling mill oil film bearing (6) is connected to the thin oil supply station (5) through a thin oil supply pipeline (8), characterized in that: A pneumatic regulating valve (4) is arranged between the oil supply pipe and the oil return pipe of the thin oil supply pipeline (8); the pneumatic regulating valve (4) regulates the flow rate and oil pressure of the thin oil supply pipeline (8).

2. The constant pressure control device for the thin oil station of the rolling mill oil film bearing according to claim 1, characterized in that: The control device is provided with a PLC controller (2); the electric control unit of the pneumatic regulating valve (4) is connected to the PLC controller (2) via a control signal circuit.

3. The constant pressure control device for the thin oil station of the rolling mill oil film bearing according to claim 1 is characterized in that: The control device is provided with an air compression station (9), and the control air cavity of the pneumatic regulating valve (4) is connected to the air compression station (9) via a pneumatic circuit.

4. The constant pressure control device for the thin oil station of the rolling mill oil film bearing according to claim 3 is characterized in that: An air filter (10) is arranged on the air inlet of the air compression station (9).

5. The constant pressure control device for the thin oil station of the rolling mill oil film bearing according to claim 2 is characterized in that: An oil circuit signal detection device (7) is arranged on the oil supply pipe of the thin oil supply pipeline (8), and the signal output circuit of the oil circuit signal detection device (7) is connected to the PLC controller (2).

6. The constant pressure control device for the thin oil station of the rolling mill oil film bearing according to claim 5 is characterized in that: The oil circuit signal detection device (7) comprises an oil pressure sensor; the model of the oil pressure sensor is HYDAC344-03-016-Y00.

7. The constant pressure control device for the thin oil station of the rolling mill oil film bearing according to claim 2 is characterized in that: The control device is provided with an alarm (3); the alarm (3) is connected to the PLC controller (2) via an alarm circuit.

8. The constant pressure control device for the thin oil station of the rolling mill oil film bearing according to claim 2 is characterized in that: The control device is provided with an HMI human-machine interface (1); the HMI human-machine interface (1) is connected to a PLC controller (2) via a signal circuit.

9. The constant pressure control device for the thin oil station of the rolling mill oil film bearing according to claim 8, characterized in that: A control computer is arranged on the operation console of the rolling mill for displaying the HMI human-machine interface (1) and for human-machine interaction.

10. The constant pressure control device for the thin oil station of the oil film bearing of a rolling mill according to any one of claims 1 to 9, characterized in that: The model of the pneumatic regulating valve (4) is pa-n540.

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