A rolling mill oil pump control system

Abstract

The utility model relates to a rolling mill oil pump control system, including an oil supply circuit, a shutdown control circuit and a low-pressure alarm circuit; the oil supply circuit is provided with an oil pump and a pressure sensor, the pressure sensor is used to determine the oil pump pressure; the pressure sensor is respectively connected to the low-pressure alarm circuit and the shutdown control circuit; the low-pressure alarm circuit is used to alarm when the oil pump pressure is lower than a first pressure threshold; the shutdown control circuit is used to control the rolling mill device to shut down when the oil pump pressure is lower than a second pressure threshold. The utility model can avoid direct shutdown due to too low pressure, issue an early warning when the pressure drops to a certain value, and remind the operator to check the hydraulic system in advance, thereby extending the service life of the roller.

Description

Technical Field

[0001] The utility model relates to the field of rolling, in particular to a rolling mill oil pump control system. Background Art

[0002] The rolling mill is a kind of mechanical equipment widely used in the whole production process. Its working principle is to process the metal under pressure between the rotating rollers. During the rolling process, the rollers need oil pumps to supply oil for lubrication, otherwise the mechanical gears of the rolling rollers will be damaged due to lack of oil. When the oil pump fails or the oil temperature is too high or the oil level is too low, the oil supply pressure will gradually decrease. When the lubricating oil pressure is too low, the machine will be shut down directly, which will cause the machine to be stuck and irreversible damage to the rolling rollers, greatly reducing the service life of the rollers. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a rolling mill oil pump control system to overcome the technical problem of rolling roll damage caused by gradual reduction in oil supply pressure.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a rolling mill oil pump control system, including an oil supply circuit, a shutdown control circuit and a low-voltage alarm circuit;

[0006] The oil supply line is provided with an oil pump and a pressure sensor, and the pressure sensor is used to determine the oil pump pressure;

[0007] The pressure sensor is connected to the low-pressure alarm circuit and the shutdown control circuit respectively;

[0008] The low pressure alarm circuit is used to give an alarm when the oil pump pressure is lower than a first pressure threshold;

[0009] The shutdown control circuit is used to control the rolling mill device to shut down when the oil pump pressure is lower than a second pressure threshold.

[0010] Optionally, the system further comprises a dual pressure digital display switch;

[0011] The pressure sensor is connected to the low-pressure alarm circuit and the shutdown control circuit respectively through the dual-pressure digital display switch;

[0012] The dual pressure digital display switch is used to output a first pressure signal to the low pressure alarm circuit when the oil pump pressure is lower than a first pressure threshold;

[0013] The dual-pressure digital display switch is also used to output a second pressure signal to the shutdown control circuit when the oil pump pressure is lower than a second pressure threshold.

[0014] Optionally, the low voltage alarm circuit includes an intermediate relay and an alarm device;

[0015] One output of the dual pressure digital display switch is connected to the intermediate relay;

[0016] The dual-pressure digital display switch is used to output a first pressure signal to the intermediate relay when the oil pump pressure is lower than a first pressure threshold;

[0017] The intermediate relay controls the alarm device to sound an alarm in response to the first pressure signal.

[0018] Optionally, the shutdown control circuit includes a PLC control device and a rolling mill device;

[0019] One output of the dual pressure digital display switch is connected to the PLC control device;

[0020] The dual pressure digital display switch is used to output a first pressure signal to the PLC control device when the oil pump pressure is lower than a second pressure threshold;

[0021] The PLC control device controls the rolling mill device to stop in response to the second pressure signal.

[0022] Optionally, the first pressure threshold is 0.35 MPA.

[0023] Optionally, the second pressure threshold is 0.2 MPA.

[0024] Optionally, the pressure sensor is powered by DC24V.

[0025] Optionally, the alarm device includes an alarm light.

[0026] The utility model provides a rolling mill oil pump control system, including an oil supply circuit, a shutdown control circuit and a low-pressure alarm circuit; the oil supply circuit is provided with an oil pump and a pressure sensor, the pressure sensor is used to determine the oil pump pressure; the pressure sensor is respectively connected to the low-pressure alarm circuit and the shutdown control circuit; the low-pressure alarm circuit is used to alarm when the oil pump pressure is lower than a first pressure threshold; the shutdown control circuit is used to control the rolling mill device to shut down when the oil pump pressure is lower than a second pressure threshold. The utility model can avoid direct shutdown due to too low pressure, issue an early warning when the pressure drops to a certain value, and remind the operator to check the hydraulic system in advance, thereby extending the service life of the roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of a first embodiment of a rolling mill oil pump control system proposed by the utility model;

[0029] Figure 2 It is a structural schematic diagram of the second embodiment of the rolling mill oil pump control system proposed by the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0031] Embodiment 1:

[0032] Figure 1 This is a structural diagram of the first embodiment of the rolling mill oil pump control system proposed by the utility model. Figure 1 The rolling mill oil pump control system of this embodiment includes: an oil supply circuit 10, a low pressure alarm circuit 20 and a shutdown control circuit 30.

[0033] An oil pump 11 and a pressure sensor 12 are provided on the oil supply circuit 10. The oil pump 11 is used to supply oil to the rolling mill device, and the pressure sensor 12 is used to determine the oil pump pressure. The pressure sensor 12 is connected to the low pressure alarm circuit 20 and the shutdown control circuit 30 respectively. The low pressure alarm circuit 20 is used to alarm when the oil pump pressure is lower than the first pressure threshold; the shutdown control circuit 30 is used to control the rolling mill device to shut down when the oil pump pressure is lower than the second pressure threshold.

[0034] The embodiment of the utility model can obtain the oil pump pressure data of the oil supply of the rolling mill device in the rolling work in real time through the pressure sensor, and transmit the oil pump pressure data to the low pressure alarm circuit and the shutdown control circuit. When the oil pump pressure is lower than the first pressure threshold, the low pressure alarm circuit can issue a low pressure alarm; when the oil pump pressure is lower than the second pressure threshold, the shutdown control circuit controls the rolling mill device to shut down. It should be noted that the first pressure threshold is generally higher than the second pressure threshold, so that the low pressure alarm is issued in advance when the pressure drops to a certain value, reminding the operator to check the hydraulic system, rather than directly shutting down the rolling mill device, causing a jam or damage to the rollers, thereby extending the service life of the rollers.

[0035] Embodiment 2:

[0036] Figure 2 This is a structural diagram of the second embodiment of the rolling mill oil pump control system proposed by the utility model. The second embodiment of the utility model can be established on the basis of the first embodiment.

[0037] A rolling mill oil pump control system proposed in an embodiment of the utility model may also include a dual pressure digital display switch 40; the pressure sensor 12 is respectively connected to the low pressure alarm circuit 20 and the shutdown control circuit 30 through the dual pressure digital display switch 40; the dual pressure digital display switch 40 is used to output a first pressure signal to the low pressure alarm circuit 20 when the oil pump pressure is lower than the first pressure threshold; the dual pressure digital display switch 40 is also used to output a second pressure signal to the shutdown control circuit 30 when the oil pump pressure is lower than the second pressure threshold.

[0038] In the embodiment of the present invention, the two outputs of the dual pressure digital display switch 40 are respectively connected to the low pressure alarm circuit 20 and the shutdown control circuit 30. When the pressure threshold is reached, the two outputs of the dual pressure digital display switch 40 send pressure signals to the low pressure alarm circuit 20 and the shutdown control circuit 30 respectively, so that the low pressure alarm circuit 20 and the shutdown control circuit 30 respond to the pressure signal and perform corresponding actions.

[0039] In an optional embodiment of the utility model, the low-pressure alarm circuit 20 may include an intermediate relay 21 and an alarm device 22; one output of the dual-pressure digital display switch 40 is connected to the intermediate relay 21. That is, the first end of the intermediate relay 21 is connected to one output of the dual-pressure digital display switch 40, and the second end is connected to the alarm device 22. The dual-pressure digital display switch 40 is used to output a first pressure signal to the intermediate relay 21 when the oil pump pressure is lower than the first pressure threshold; the intermediate relay 21 responds to the first pressure signal and controls the alarm device 22 to alarm. Preferably, the alarm device 22 may include an alarm light, which may be set on a control panel for the operator to operate. When the oil pump pressure is lower than the first pressure threshold, the intermediate relay 21 is energized and the alarm light flashes to remind the operator that the oil pump is faulty, the oil temperature is too high or the oil level is too low, and the operator then checks the hydraulic system.

[0040] In an optional embodiment of the utility model, the shutdown control circuit 30 includes a PLC control device 31 and a rolling mill device 32; one output of the dual pressure digital display switch 40 is connected to the PLC control device 31. That is, the first end of the PLC control device 31 is connected to one output of the dual pressure digital display switch 40, and the second end is connected to the rolling mill device 32. The dual pressure digital display switch 40 is used to output a first pressure signal to the PLC control device 31 when the oil pump pressure is lower than the second pressure threshold; the PLC control device 31 controls the rolling mill device 32 to shut down in response to the second pressure signal. In other words, when the oil pump pressure is lower than the warning pressure and reaches the shutdown low pressure, the embodiment of the utility model sends a shutdown signal to the PLC control device 31, and the PLC control device 31 responds to the shutdown signal to control the rolling mill device 32 to shut down, that is, to control the rollers to stop working.

[0041] In an optional embodiment of the utility model, the pressure sensor 12 is powered by DC24V, and performs two-way switch quantity (normally open) output through the dual pressure digital display switch 40, and the output voltage type is a DC24V positive signal. Preferably, the first pressure threshold is set to 0.35MPA; and / or, the second pressure threshold is set to 0.2MPA. When the pressure sensor detects that the oil pump pressure is ≤0.35MPA, the first pressure signal is output to the low-pressure alarm circuit 20 through the dual pressure digital display switch 40 to control the intermediate relay 21 to be attracted, and the alarm light flashes to alarm. When the pressure sensor detects that the oil pump pressure is ≤0.2MPA, the second pressure signal is output to the shutdown control circuit 30 through the dual pressure digital display switch 40, so that the PLC control device 31 program controls the rolling mill device 32 to shut down, thereby avoiding damage to the roller head of the rolling mill device 32.

[0042] The utility model embodiment provides a rolling mill oil pump control system, which is provided with an oil supply circuit, a shutdown control circuit and a low-pressure alarm circuit; an oil pump and a pressure sensor are provided on the oil supply circuit, and the pressure sensor is used to determine the oil pump pressure; the pressure sensor is respectively connected to the low-pressure alarm circuit and the shutdown control circuit; the low-pressure alarm circuit is used to alarm when the oil pump pressure is lower than the first pressure threshold; the shutdown control circuit is used to control the rolling mill device to shut down when the oil pump pressure is lower than the second pressure threshold. The utility model can avoid direct shutdown due to too low pressure, and first issue an early warning when the pressure drops to a certain value, reminding the operator in advance to check the hydraulic system, thereby extending the service life of the roller.

[0043] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0044] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A rolling mill oil pump control system, characterized in that: Including oil supply circuit, shutdown control circuit and low-voltage alarm circuit; The oil supply line is provided with an oil pump and a pressure sensor, and the pressure sensor is used to determine the oil pump pressure; The pressure sensor is connected to the low-pressure alarm circuit and the shutdown control circuit respectively; The low pressure alarm circuit is used to give an alarm when the oil pump pressure is lower than a first pressure threshold; The shutdown control circuit is used to control the rolling mill device to shut down when the oil pump pressure is lower than a second pressure threshold.

2. The rolling mill oil pump control system according to claim 1, characterized in that: The system also includes a dual pressure digital display switch; The pressure sensor is connected to the low-pressure alarm circuit and the shutdown control circuit respectively through the dual-pressure digital display switch; The dual pressure digital display switch is used to output a first pressure signal to the low pressure alarm circuit when the oil pump pressure is lower than a first pressure threshold; The dual-pressure digital display switch is also used to output a second pressure signal to the shutdown control circuit when the oil pump pressure is lower than a second pressure threshold.

3. The rolling mill oil pump control system according to claim 2, characterized in that: The low voltage alarm circuit includes an intermediate relay and an alarm device; One output of the dual pressure digital display switch is connected to the intermediate relay; The dual-pressure digital display switch is used to output a first pressure signal to the intermediate relay when the oil pump pressure is lower than a first pressure threshold; The intermediate relay controls the alarm device to sound an alarm in response to the first pressure signal.

4. The rolling mill oil pump control system according to claim 2, characterized in that: The shutdown control circuit includes a PLC control device and a rolling mill device; One output of the dual pressure digital display switch is connected to the PLC control device; The dual pressure digital display switch is used to output a first pressure signal to the PLC control device when the oil pump pressure is lower than a second pressure threshold; The PLC control device controls the rolling mill device to stop in response to the second pressure signal.

5. The rolling mill oil pump control system according to claim 1, characterized in that: The first pressure threshold is 0.35 MPA.

6. The rolling mill oil pump control system according to claim 1, characterized in that: The second pressure threshold is 0.2 MPA.

7. The rolling mill oil pump control system according to claim 1, characterized in that: The pressure sensor is powered by DC24V.

8. The rolling mill oil pump control system according to claim 3, characterized in that: The alarm device comprises an alarm light.

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