A filtering device for hydraulic pump oil leakage in steelmaking hydraulic system

Abstract

The present invention provides a filtering device for hydraulic pump leakage return oil in a steelmaking hydraulic system, comprising a first pipeline connected to the hydraulic pump, and also comprising: an auxiliary oil tank, a filtering component and a second pipeline. The auxiliary oil tank comprises a box body, and an oil inlet and an oil return port are provided on the side wall of the box body. The oil inlet is connected to the first pipeline, and the hydraulic pump leakage return oil flows into the auxiliary oil tank through the first pipeline; the filtering component is installed at the oil return port and is located on the inner wall of the box body, and the filtering component is used to filter the hydraulic pump leakage return oil; one end of the second pipeline is connected to the oil return port, and the other end is inserted below the liquid level of the hydraulic oil in the main oil tank. The hydraulic pump leakage return oil is filtered by the filtering component and then enters the main oil tank through the second pipeline. The filtering device in the present invention solves the problem that the unfiltered leakage return oil directly returns to the main oil tank to pollute the hydraulic oil. The amount of oil leakage of the hydraulic pump can also be observed through a detachable cover plate, which can effectively monitor the operating condition of the hydraulic pump and take timely countermeasures.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic systems in electric arc furnace steelmaking industry, and in particular relates to a filtering device for oil leakage back from a hydraulic pump in a steelmaking hydraulic system. Background Art

[0002] The hydraulic system is a key equipment in the electric arc furnace steelmaking production process. The important key actions in its hydraulic control, such as furnace body tilting, electrode lifting and lowering, and furnace cover rotation, are all controlled by the hydraulic proportional valve in the hydraulic system. The hydraulic system containing the proportional valve requires the hydraulic oil cleanliness to reach NAS1638-7 level, which is higher than the ordinary hydraulic system. All actions in the smelting process are powered by the hydraulic pump, which is achieved by controlling the action of the hydraulic cylinder through the hydraulic proportional valve. The continuous and stable output power of the hydraulic pump is an important guarantee for the safe and efficient operation of electric arc furnace steelmaking.

[0003] In the prior art, the hydraulic pump in the electric arc furnace hydraulic system mainly uses a plunger pump, and the oil filtration in the hydraulic system mainly relies on a circulating filtration system, while ignoring the situation that the return oil from the plunger pump, a pollution source, directly enters the oil tank without effective filtration. The copper shavings, powder and other particles generated by the long-term operation of the plunger pump directly return to the oil tank through the return oil pipeline, which can easily pollute the oil in the oil tank, thereby reducing the cleanliness of the oil in the hydraulic system and seriously affecting the precise control of the proportional valve.

[0004] The oil leakage of the plunger pump is mainly caused by the wear between the internal plunger cylinder and the valve plate. The increase in leakage indicates that the friction gap between the cylinder and the valve plate increases, the volumetric efficiency of the plunger pump decreases, and it is unable to stably and continuously supply pressure to the entire hydraulic system. At present, the oil leakage of the plunger pump is directly returned to the oil tank through a separate pipeline. Maintenance personnel cannot observe the amount of oil leakage of the plunger pump to effectively monitor the operating condition of the plunger pump.

[0005] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a filtering device for the oil leakage back from the hydraulic pump in the steelmaking hydraulic system, so as to overcome the problem in the above-mentioned prior art that the oil cleanliness of the hydraulic system is not enough, which affects the precise control of the proportional valve, and the problem that the amount of oil leakage from the hydraulic pump cannot be observed and the operating condition of the hydraulic pump cannot be judged.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A filtering device for oil leakage from a hydraulic pump in a steelmaking hydraulic system, comprising a first pipeline connected to the hydraulic pump, and the filtering device further comprising:

[0009] Auxiliary oil tank, the auxiliary oil tank comprises a tank body, a side wall of the tank body is provided with an oil inlet and an oil outlet, the oil inlet is connected to the first pipeline, and the hydraulic pump drain return oil flows into the auxiliary oil tank through the first pipeline;

[0010] A filter assembly, the filter assembly is installed at the oil outlet and located on the inner wall of the box body, and the filter assembly is used to filter the oil leaked back from the hydraulic pump;

[0011] A second pipeline, one end of which is connected to the oil outlet, and the other end is inserted below the liquid level of the hydraulic oil in the main oil tank. The return oil from the hydraulic pump is filtered by the filter assembly and then enters the main oil tank through the second pipeline.

[0012] As a preferred embodiment of the filtering device for the oil leakage back from the hydraulic pump in the steelmaking hydraulic system as described above, the height of the oil inlet is higher than the height of the oil outlet.

[0013] As described above, the filtering device for the return oil of the hydraulic pump in the steelmaking hydraulic system is, as a preferred embodiment, the height of the bottom end of the auxiliary oil tank is higher than the height of the maximum allowable liquid level of the hydraulic oil in the main oil tank; the height of the top end of the auxiliary oil tank is consistent with the height of the top end of the main oil tank.

[0014] The filtering device for the oil leakage back from the hydraulic pump in the steelmaking hydraulic system as described above, as a preferred embodiment, the auxiliary oil tank also includes a cover plate, the top of the box body is open, the cover plate is fixed to the top opening of the box body by bolts to close the top opening of the box body, and the cover plate is opened to observe the amount of oil leakage from the hydraulic pump.

[0015] As a preferred embodiment of the filtering device for the oil leakage back from the hydraulic pump in the steelmaking hydraulic system as described above, a handle is provided on the cover plate.

[0016] As described above, the filtering device for the hydraulic pump return oil in the steelmaking hydraulic system is, as a preferred embodiment, a drain outlet is provided at the bottom of the auxiliary oil tank, and a drain valve is provided at the drain outlet, and the remaining oil at the bottom of the auxiliary oil tank and the dirt after cleaning the auxiliary oil tank are discharged through the drain valve.

[0017] As a preferred embodiment of the filtering device for the oil leakage back from the hydraulic pump in the steelmaking hydraulic system, the side wall of the main oil tank close to the hydraulic pump is the first side wall, the tank body of the auxiliary oil tank is fixed on the first side wall, and at least a part of the first side wall forms a side wall of the auxiliary oil tank;

[0018] The oil outlet is opened on the first side wall, and the oil outlet passes through the first side wall.

[0019] As described above, the filtering device for the hydraulic pump return oil in the steelmaking hydraulic system is, as a preferred embodiment, the filtering assembly includes a filter screen and a pressure plate, the pressure plate is fixed to the edge of the filter screen, a threaded hole is opened on the pressure plate, and bolts pass through the pressure plate to fix the filtering assembly to the inner wall of the box.

[0020] As a preferred embodiment of the filtering device for the oil leakage back from the hydraulic pump in the steelmaking hydraulic system as described above, the filter screen is arranged on the edge of the oil outlet located on one side of the auxiliary oil tank.

[0021] As a preferred embodiment of the filtering device for the oil leakage back from the hydraulic pump in the steelmaking hydraulic system as described above, the material of the filter screen is stainless steel; the pore size of the filter screen is 0.18 mm.

[0022] Compared with the closest prior art, the technical solution provided by the present invention has the following excellent effects:

[0023] The filtering device in the present invention is used to filter the oil leakage from the hydraulic pump to prevent pollutants such as metal powder in the leakage oil from directly flowing into the main oil tank, thereby improving the cleanliness of the hydraulic oil in the hydraulic system and ensuring that the proportional valve can be accurately controlled; in addition, since the filter has a large oil flow area and is regularly replaced and inspected, damage to the hydraulic pump caused by excessive pressure in the first pipeline can be eliminated.

[0024] The filtering device in the present invention solves the problem of unfiltered leakage oil directly returning to the main oil tank and contaminating the hydraulic oil. The detachable cover plate arranged on the top of the auxiliary oil tank can be used to observe the oil leakage amount of the hydraulic pump, which can effectively monitor the operating condition of the hydraulic pump and take timely countermeasures, thereby reducing the failure rate of the hydraulic system and greatly improving the stability and reliability of the operation of the steelmaking hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0026] Figure 1 It is a partial principle diagram of oil return from a hydraulic pump in a hydraulic system according to a specific embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of a filtering device in a specific embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the auxiliary fuel tank and the main fuel tank in a specific embodiment of the present invention.

[0029] In the figure: 1. first pipeline; 101. oil inlet; 2. auxiliary oil tank; 3. filter assembly; 301. filter screen; 302. pressure plate; 401. oil outlet; 5. main oil tank; 6. cover plate; 601. handle; 7. drain valve; 701. drain outlet; 8. oil suction pipe; 9. oil suction butterfly valve; 10. electric motor; 11. high-pressure oil pipeline; 12. hydraulic pump. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0031] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0033] The filter device in the present invention is used to filter the oil leakage from the hydraulic pump 12 to prevent the metal powder and other pollutants in the leakage oil from directly flowing into the main oil tank 5, thereby improving the cleanliness of the hydraulic oil in the hydraulic system and ensuring that the proportional valve can be accurately controlled; in addition, since the filter 301 has a large oil flow area and is regularly replaced and inspected, the damage to the hydraulic pump 12 caused by excessive pressure in the first pipeline 1 can be eliminated. The problem of unfiltered leakage oil directly returning to the main oil tank 5 and contaminating the hydraulic oil is well solved. The amount of oil leakage from the hydraulic pump 12 can also be observed through the detachable cover plate 6 set at the top of the auxiliary oil tank 2, which can effectively monitor the operating conditions of the hydraulic pump 12 and take timely countermeasures, reduce the failure rate of the hydraulic system, and greatly improve the stability and reliability of the operation of the steelmaking hydraulic system.

[0034] like Figure 1 The figure shows a partial principle diagram of the hydraulic pump oil return in the hydraulic system of a specific embodiment of the present invention. Figure 1The schematic diagram in the figure is a part of the complete hydraulic schematic diagram, which mainly reflects the process of the leakage return oil of the two hydraulic pumps 12 flowing into the auxiliary oil tank 2. The specific working principle of this part of the schematic diagram is that the motor 10 is started to drive the hydraulic pump 12 to rotate, and the hydraulic pump 12 sucks oil from the main oil tank 5 through the oil suction port pipeline 8, and starts to pressurize after passing through the oil suction port butterfly valve 9, and supplies the high-pressure oil to the entire hydraulic system through the high-pressure oil pipeline 11. At the same time, the hydraulic pump 12 itself will also produce leakage return oil, which flows into the auxiliary oil tank 2 through the first pipeline 1 (i.e., the leakage return oil pipeline).

[0035] The "leakage" of the return oil in the specific embodiment of the present invention refers to the oil that normally leaks out from the housing of the hydraulic pump when it is working, and is discharged through the oil leakage port on the surface of the housing of the hydraulic pump 12, and is not the "leakage" of pressure relief. The normal leakage oil of the hydraulic pump 12 returns to the main oil tank 5 through the first pipeline 1 and the second pipeline, which can be collectively referred to as the return oil of the hydraulic pump 12.

[0036] The hydraulic system includes a hydraulic pump 12 (power element), a hydraulic cylinder (actuator), a hydraulic valve (control element), a main oil tank 5, auxiliary elements and hydraulic oil. The hydraulic pump 12 is a power element of the hydraulic system, which is driven by an engine or an electric motor 10, sucks oil from the hydraulic oil tank, forms pressure oil and discharges it to the actuator. The hydraulic pump 12 is divided into a gear pump, a plunger pump, a vane pump and a screw pump according to the structure. The hydraulic pump 12 used in the specific embodiment of the present invention is a plunger pump. The copper shavings, powder and other particles generated by the long-term operation of the plunger pump are very likely to pollute the hydraulic oil in the oil tank, thereby reducing the cleanliness of the hydraulic oil in the hydraulic system and seriously affecting the precise control of the hydraulic valve (i.e., proportional valve).

[0037] The present invention provides a filtering device for the oil leakage back from a hydraulic pump 12 in a steelmaking hydraulic system, comprising a first pipeline 1 connected to the hydraulic pump 12, such as Figure 2 As shown, the filtering device also includes:

[0038] Auxiliary oil tank 2, auxiliary oil tank 2 includes a box body, and an oil inlet 101 and an oil outlet are opened on the side wall of the box body. The oil inlet 101 is connected to the first pipeline 1, and the leakage return oil of the hydraulic pump 12 flows into the auxiliary oil tank 2 through the first pipeline 1. In a specific embodiment of the present invention, the height of the oil inlet 101 is higher than the height of the oil outlet 401. After the oil inlet 101 flows to the auxiliary oil tank 2, it flows to the oil outlet 401 through the filter 301. The oil inlet 101 is higher than the oil outlet 401, which can facilitate the observation of the size of the oil flow of the oil inlet 101 (that is, the size of the oil leakage of the hydraulic pump), and at the same time, it can also ensure that the leakage return oil flows from the oil inlet 101 to the auxiliary oil tank 2 without back pressure.

[0039] The return oil from the hydraulic pump 12 flows into the auxiliary oil tank 2 through the oil inlet 101. When the amount of the return oil entering the auxiliary oil tank 2 reaches a certain height, that is, when the amount of the return oil reaches the height of the oil outlet 401, it is filtered by the filter 301 and flows out through the oil outlet 401.

[0040] In a specific embodiment of the present invention, the height of the bottom end of the auxiliary oil tank 2 is higher than the height of the maximum allowable liquid level of the hydraulic oil in the main oil tank 5; the height of the top end of the auxiliary oil tank 2 is consistent with the height of the top end of the main oil tank 5.

[0041] In a specific embodiment of the present invention, the auxiliary oil tank 2 further includes a cover plate 6, the top of the box body is open, and the cover plate 6 is fixed to the top opening of the box body by bolts to close the top opening of the box body, and the cover plate 6 is opened to observe the oil leakage of the hydraulic pump 12. The cover plate 6 is detachable, and after the cover plate 6 is removed and opened, the amount of oil leaked back from the auxiliary oil tank 2 can be directly observed to evaluate the oil leakage of the hydraulic pump 12, and the operating condition of the hydraulic pump 12 can be effectively monitored and countermeasures can be taken in time, and the spare hydraulic pump 12 can be used in advance to avoid the occurrence of hydraulic pump 12 failure.

[0042] In a specific embodiment of the present invention, a handle 601 is provided on the cover plate 6. The handle 601 is provided to facilitate opening the cover plate 6.

[0043] In a specific embodiment of the present invention, a drain port 701 is provided at the bottom of the auxiliary oil tank 2, and a drain valve 7 is provided at the drain port 701. The residual oil at the bottom of the auxiliary oil tank 2 and the dirt after cleaning the auxiliary oil tank 2 are discharged through the drain valve 7. The drain valve 7 is used to clean the auxiliary oil tank 2. When the hydraulic pump 12 stops working and there is no leakage and the return oil returns to the auxiliary oil tank 2, the drain valve 7 is opened to open the cover plate 6 of the auxiliary oil tank 2, open the drain valve 7, and discharge the residual oil at the bottom of the auxiliary oil tank 2 (the residual oil that cannot pass through the filter 301 and return to the main oil tank 5) through the drain valve 7, and then use a cleaning tool to clean the inside of the auxiliary oil tank 2, and then close the drain valve 7 after completion.

[0044] In a specific embodiment of the present invention, the side wall of the main oil tank 5 close to the hydraulic pump 12 is the first side wall, the tank body of the auxiliary oil tank 2 is fixed on the first side wall, and at least a part of the first side wall forms a side wall of the auxiliary oil tank 2;

[0045] The oil outlet is arranged on the first side wall and passes through the first side wall.

[0046] The filter assembly 3 is installed at the oil outlet and located on the inner side wall of the box body. The filter assembly 3 is used to filter the leakage return oil of the hydraulic pump 12. The leakage return oil of the hydraulic pump 12 flows directly into the auxiliary oil tank 2 through the first pipeline 1. When the oil level in the auxiliary oil tank 2 is higher than the oil outlet 401, the leakage return oil in the auxiliary oil tank 2 will directly flow into the second pipeline through the filter assembly 3, and finally flow back to the main oil tank 5.

[0047] In a specific embodiment of the present invention, the filter assembly 3 includes a filter screen 301 and a pressure plate 302. The pressure plate 302 is fixed to the edge of the filter screen 301. The pressure plate 302 is provided with a threaded hole. Bolts pass through the pressure plate 302 to fix the filter assembly 3 to the inner wall of the box. The filter screen 301 is replaceable. The filter screen 301 should be replaced and checked regularly during use to ensure the oil flow area of ​​the filter screen 301 to prevent the pressure of the first pipeline 1 from being too high and causing damage to the hydraulic pump 12.

[0048] In a specific embodiment of the present invention, the filter screen 301 is disposed on the edge of the oil outlet 401 located on one side of the auxiliary oil tank 2 .

[0049] If the auxiliary oil tank 2 is directly welded to the first side wall of the main oil tank 5 close to the hydraulic pump 12, then one side wall of the auxiliary oil tank 2 and the first side wall of the main oil tank 5 share the same stainless steel plate, that is, a filter screen 301 is separated from the second pipeline and the auxiliary oil tank 2.

[0050] In a specific embodiment of the present invention, the filter screen 301 is made of stainless steel, and the pore size of the filter screen 301 is 0.18 mm. The filter screen 301 adopts a filtration accuracy of 80 mesh, and the corresponding pore size of the filter screen is 0.18 mm.

[0051] The second pipeline, one end of which is connected to the oil outlet, and the other end is inserted below the liquid level of the hydraulic oil in the main oil tank 5. The clean hydraulic oil after the leakage return oil of the hydraulic pump 12 is filtered by the filter assembly 3 enters the main oil tank 5 through the second pipeline. One port of the second pipeline is directly adjacent to the filter screen 301, and the leakage return oil acting on the auxiliary oil tank 2 directly flows into the second pipeline after the clean hydraulic oil is filtered by the filter screen 301. The other port of the second pipeline is in the main oil tank 5 and is directly inserted below the liquid level of the hydraulic oil in the main oil tank 5.

[0052] In summary, the filter device of the present invention prevents pollutants such as metal powder in the leakage oil from directly flowing into the main oil tank 5, thereby ensuring the cleanliness of the oil. Since the filter 301 has a large oil flow area and is regularly replaced and inspected, it can eliminate the damage to the hydraulic pump 12 caused by excessive pressure in the leakage oil pipeline. In addition, by opening the cover plate 6 on the auxiliary oil tank 2, the leakage of the hydraulic pump 12 can be directly observed, the operating condition of the hydraulic pump 12 can be effectively monitored and countermeasures can be taken in time, the failure rate of the hydraulic system can be reduced, and the stability and reliability of the electric arc furnace steelmaking hydraulic system can be greatly improved.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A filtering device for oil leakage from a hydraulic pump in a steelmaking hydraulic system, comprising a first pipeline connected to the hydraulic pump, characterized in that: The filtering device also includes: Auxiliary oil tank, the auxiliary oil tank comprises a tank body, a side wall of the tank body is provided with an oil inlet and an oil outlet, the oil inlet is connected to the first pipeline, and the hydraulic pump drain return oil flows into the auxiliary oil tank through the first pipeline; A filter assembly, the filter assembly is installed at the oil outlet and located on the inner wall of the box body, and the filter assembly is used to filter the oil leaked back from the hydraulic pump; a second pipeline, one end of which is connected to the oil outlet, and the other end of which is inserted below the liquid level of the hydraulic oil in the main oil tank, and the oil returned from the hydraulic pump is filtered by the filter assembly and then enters the main oil tank through the second pipeline; The height of the oil inlet is higher than the height of the oil outlet; The height of the bottom end of the auxiliary oil tank is higher than the height of the maximum allowable liquid level of the hydraulic oil in the main oil tank; the height of the top end of the auxiliary oil tank is consistent with the height of the top end of the main oil tank; The auxiliary oil tank further comprises a cover plate, the top of the box body is open, the cover plate is fixed to the top opening of the box body by bolts to close the top opening of the box body, and the cover plate is opened to observe the oil leakage of the hydraulic pump; A sewage outlet is arranged at the bottom of the auxiliary oil tank, and a sewage valve is arranged at the sewage outlet.

2. The filtering device for the hydraulic pump return oil in the steelmaking hydraulic system according to claim 1, characterized in that: A handle is arranged on the cover plate.

3. The filtering device for the hydraulic pump return oil in the steelmaking hydraulic system according to claim 1, characterized in that: The remaining oil at the bottom of the auxiliary oil tank and the dirt after cleaning the auxiliary oil tank are discharged through the drain valve.

4. The filtering device for the hydraulic pump return oil in the steelmaking hydraulic system according to claim 1, characterized in that: The side wall of the main oil tank close to the hydraulic pump is a first side wall, the tank body of the auxiliary oil tank is fixed on the first side wall, and at least a part of the first side wall forms a side wall of the auxiliary oil tank; The oil outlet is opened on the first side wall, and the oil outlet passes through the first side wall.

5. The filtering device for the hydraulic pump return oil in the steelmaking hydraulic system according to claim 1 or 4, characterized in that: The filter assembly includes a filter screen and a pressure plate, wherein the pressure plate is fixed to the edge of the filter screen, a threaded hole is provided on the pressure plate, and bolts pass through the pressure plate to fix the filter assembly to the inner wall of the box body.

6. The filtering device for the hydraulic pump return oil in the steelmaking hydraulic system according to claim 5, characterized in that: The filter screen is arranged on the edge of the oil outlet located at one side of the auxiliary oil tank.

7. The filtering device for the hydraulic pump return oil in the steelmaking hydraulic system according to claim 5, characterized in that: The filter screen is made of stainless steel and has a pore size of 0.18 mm.

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