A multi-effect filtering device applied to a hydraulic system oil return tank and a filtering method

Abstract

The application discloses a multi-effect filtering device applied to a hydraulic system oil return tank and a filtering method, which comprises connecting components at two ends, a first filtering screen, a second filtering screen and a third filtering screen arranged between the two connecting components, the second filtering screen is located between the first filtering screen and the third filtering screen, the second filtering screen is made of a flexible strong magnetic material, one of the connecting components is provided with a scroll piece, the other connecting component is provided with a filter screen rotating shaft, the filter screen rotating shaft is connected with a direct current motor, the second filtering screen is connected on the scroll piece and the filter screen rotating shaft, and a cleaning assembly for cleaning the second filtering screen is further arranged on the outer periphery of the filter screen rotating shaft. The multi-effect filtering device applied to the hydraulic system oil return tank has a filtering precision in a form of step-by-step progression, higher filtering precision is obtained, and the filter screen blocking condition can be greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hydraulic systems, and particularly relates to a multi-effect filtering device applied to a return oil tank of a hydraulic system and a filtering method. BACKGROUND

[0002] The hydraulic transmission mechanism is a mechanical mechanism composed of a power element, an executing mechanism, a control element and other auxiliary elements, and capable of transmitting power through oil. The hydraulic transmission mechanism has the advantages of large output power, stable transmission and easy automation, and is a commonly used power transmission form in industrial fields at present. The quality of the oil used has a great influence on the action accuracy and flexibility of the control element, especially for the hydraulic transmission mechanism with high precision. Therefore, in the hydraulic transmission mechanism system, a multi-stage oil filtering device needs to be arranged to filter out impurities, iron filings, oil sludge and other impurities in the oil. Generally, a one-stage oil plate filter screen is arranged in the return oil tank to preliminarily filter the system return oil.

[0003] The filtering screen of the multi-stage oil filtering device has the following disadvantages:

[0004] 1. The filtering precision of the simple plate filter screen is limited, and the plate filter screen is prone to be blocked and cannot filter out the free-state oxides and oil sludge in the oil.

[0005] 2. There is no state reminder after the blocking, and the plate filter screen cannot be automatically cleaned, so the cleaning work needs to be completed manually, which is not conducive to the automatic operation of the equipment. SUMMARY

[0006] The present application aims at the deficiencies of the prior art, and provides a multi-effect filtering device applied to a return oil tank of a hydraulic system to solve the problems that the filtering screen device in the return oil tank is prone to be blocked and inconvenient to clean in the prior art.

[0007] The technical objective of the present application is achieved by the following technical scheme: a multi-effect filtering device applied to a return oil tank of a hydraulic system, comprising connecting components at two ends, a one-stage filtering screen, a two-stage filtering screen and a three-stage filtering screen arranged between the two connecting components, the two-stage filtering screen being located between the one-stage filtering screen and the three-stage filtering screen, the two-stage filtering screen being made of a flexible strong magnetic material, one of the connecting components being provided with a scroll sheet, the other connecting component being provided with a filter screen rotating shaft, the filter screen rotating shaft being connected with a direct current motor, the two-stage filtering screen being connected with the scroll sheet and the filter screen rotating shaft, and a cleaning assembly for cleaning the two-stage filtering screen being further arranged on the outer periphery of the filter screen rotating shaft.

[0008] Preferably, the scroll sheet is wound by a metal material with a rebound property, and the scroll sheet is used to pull the two-stage filtering screen to displace when the two-stage filtering screen loses the pulling force of the filter screen rotating shaft.

[0009] Preferably, the cleaning assembly comprises a fixed plate vertically arranged at the outer periphery of the filter screen rotary shaft, the fixed plate is connected with a brush plate through an adjusting spring, and a brush is connected on the brush plate and abuts against the filter screen rotary shaft.

[0010] Preferably, a plurality of spring devices are connected on the first filter screen and the third filter screen, and the spring devices located on both sides of the second filter screen abut against the second filter screen.

[0011] Preferably, the spring device comprises a spring fixedly connected on the first filter screen and the second filter screen, an end of the spring is fixedly connected with a wheel seat, a roller is installed on the wheel seat, and an axis of the roller is horizontally arranged.

[0012] Preferably, after the spring devices located on both sides of the second filter screen abut against the second filter screen, the second filter screen forms a corrugated curved surface.

[0013] Another object of the present application is to provide a hydraulic system oil return tank oil product filtering method, using the above-mentioned multi-effect filter device applied in the hydraulic system oil return tank, comprising the following steps:

[0014] S1, the oil return tank is divided into a clean oil area and an oil return area, and the multi-effect filter device applied in the hydraulic system oil return tank is installed on the separation surface, so that the first filter screen is located on one side of the oil return area, and the third filter screen is located on one side of the clean oil area;

[0015] S2, the multi-effect filter device applied in the hydraulic system oil return tank is started to work synchronously with the hydraulic system, the starting frequency of the filter screen rotary shaft is set according to the working environment of the hydraulic system, so that the second filter screen is regularly cleaned.

[0016] Preferably, in step S2, the starting frequency of the filter screen rotary shaft is set to start once every 240-360 hours.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. The multi-effect filter device applied in the hydraulic system oil return tank and the filtering method provided by the present application adopt a ladder-type progressive form for the filtering precision of the filter screen, so that higher filtering precision is obtained, and the filter screen clogging condition is greatly reduced.

[0019] 2. The multi-effect filter device applied in the hydraulic system oil return tank and the filtering method provided by the present application have the function of regular cleaning for the filter screen of the second filter device which is most prone to clogging, can realize automatic cleaning of the filter screen, improve the automation degree of the equipment, and reduce the use of human resources.

[0020] 3. The application provides a multi-effect filtering device and filtering method applied to a hydraulic system oil return tank, wherein the secondary filtering device adopts a strong magnetic flexible material, which can improve the adsorption and filtering capacity of iron filings.

[0021] 4. The application provides a multi-effect filtering device and filtering method applied to a hydraulic system oil return tank, wherein a DC motor is used to drive a filter screen rotating shaft to drive the filter screen to complete the first stage cleaning, and after the first stage cleaning process is completed, the filter screen is returned by a self-adaptive spring, and the filter screen returns while completing the second stage cleaning process, thereby improving the cleaning effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a top view structural schematic diagram of an embodiment of the application.

[0023] Figure 2 is a side view structural schematic diagram of an embodiment of the application.

[0024] Figure 3 is a three-dimensional structural schematic diagram of an embodiment of the application.

[0025] Figure 4 is an enlarged structural schematic diagram of a spring device in an embodiment of the application.

[0026] Figure 5 is a front view structural schematic diagram of a cleaning assembly in an embodiment of the application.

[0027] Figure 6 is a three-dimensional structural schematic diagram of a cleaning assembly in an embodiment of the application.

[0028] Figure 7 is an implementation state schematic diagram of an embodiment of the application.

[0029] In the above drawings: 1, connecting part; 2, primary filter screen; 3, secondary filter screen; 4, tertiary filter screen; 5, scroll piece; 6, filter screen rotating shaft; 7, DC motor; 8, cleaning assembly; 9, fixed plate; 10, adjusting spring; 11, brush plate; 12, brush; 13, spring device; 14, spring; 15, wheel seat; 16, roller; A, oil return tank; A1, clean oil area, A2, oil return area; B, separation surface. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0031] Reference to the accompanying drawings Figure 1 - the accompanying drawings Figure 3 As a preferred embodiment of the present application, the embodiment provides a multi-effect filtering device applied in a return oil tank of a hydraulic system, comprising two connecting components 1, each of which is surrounded by a metal plate into a rectangular cavity, a first filter screen 2, a second filter screen 3 and a third filter screen 4 are arranged between the two connecting components 1, the second filter screen 3 is located between the first filter screen 2 and the third filter screen 4, the connecting component 1 provides a mounting base for the first filter screen 2, the second filter screen 3 and the third filter screen 4, and is used for connecting with the return oil tank A, the first filter screen 2 has a lower filtering precision and is mainly used for intercepting large-particle impurities in oil products; the second filter screen 3 is made of a strong magnetic material with a certain flexibility and is mainly used for adsorbing iron filings and impurities with polarity in oil, one of the connecting components 1 is provided with a vortex sheet 5, the other connecting component is provided with a filter screen rotating shaft 6 which is rotatably installed through a bearing, the filter screen rotating shaft 6 is connected with a direct-current motor 7, the two ends of the second filter screen 3 are connected with the filter screen rotating shaft 6 and the vortex sheet 5 respectively, and a cleaning assembly 8 for cleaning the second filter screen 3 is further arranged on the outer periphery of the filter screen rotating shaft 6, and the cleaning assembly 8 is installed between the first filter screen 2 and the filter screen rotating shaft 6.

[0032] In the above embodiment, the first filter screen 2 and the third filter screen 4 adopt the form of conventional plate filter screens, the first filter screen 2 with a lower filtering precision is used for completing preliminary filtering, and the third filter screen 4 with a higher filtering precision is used for completing final filtering, so that the combined filter screen with a certain filtering precision gradient can greatly avoid the situation of filter screen blockage.

[0033] In some preferred embodiments, the vortex sheet 5 is wound from a metal material with a rebound property, and the vortex sheet 5 is used for pulling the second filter screen 3 to displace when the second filter screen 3 loses the pulling force of the filter screen rotating shaft 6.

[0034] In some embodiments, referring to the accompanying drawings Figure 5 and the accompanying drawings Figure 6 The cleaning assembly 8 comprises a fixed plate 9 which is vertically arranged on the outer periphery of the filter screen rotating shaft 6, the fixed plate 9 is connected with a brush plate 11 through an adjusting spring 10, a brush 12 is connected on the brush plate 11, and the brush 12 abuts against the filter screen rotating shaft 6.

[0035] In some preferred embodiments, referring to the accompanying drawings Figure 3 and the accompanying drawings Figure 4 The first filter screen 2 and the third filter screen 4 are both connected with a plurality of spring devices 13, and the spring devices 13 located on both sides of the second filter screen 3 abut against the second filter screen 3.

[0036] In some preferred embodiments, refer to the accompanying Figure 3 and the accompanying Figure 4 The spring device 13 comprises springs 14 fixedly connected to the primary filter screen 2 and the secondary filter screen 3, the ends of the springs 14 are fixedly connected to wheel seats 15, the wheel seats 15 are provided with rollers 16, and the axes of the rollers 16 are horizontally arranged.

[0037] In some other preferred embodiments, refer to the accompanying Figure 1 and the accompanying Figure 3 When the spring devices 13 on both sides of the secondary filter screen 3 abut against the secondary filter screen 3, the secondary filter screen 3 forms a corrugated curved surface. In this embodiment, the primary filter screen 2 and the tertiary filter screen 4 are fixedly connected to the secondary filter screen 3 in a cross form through the spring device 13, so that the secondary filter screen 3 is in a back-and-forth bending wave curved surface form in the normal working condition, the flow area is increased, and the filtering efficiency is effectively improved. Meanwhile, under the assistance of the rollers 16, the secondary filter screen 3 is more smoothly operated in the cleaning state.

[0038] In another aspect of the present application, a method for filtering oil in a hydraulic system oil return tank is provided, and the method uses the multi-effect filtering device applied in the hydraulic system oil return tank in the present application, and comprises the following steps:

[0039] S1, the oil return tank is divided into a clean oil area A1 and an oil return area A2, and the multi-effect filtering device applied in the hydraulic system oil return tank is installed on the separation surface B, refer to the accompanying Figure 7 so that the primary filter screen is located on one side of the oil return area A2, and the tertiary filter screen is located on one side of the clean oil area A1;

[0040] S2, the multi-effect filtering device applied in the hydraulic system oil return tank is started to work synchronously with the hydraulic system, the starting frequency of the filter screen rotating shaft 6 is set according to the working environment of the hydraulic system, and the secondary filter screen 3 is regularly cleaned.

[0041] In some preferred embodiments, in step S2, the starting frequency of the filter screen rotating shaft 6 is set to be started once every 240-360 hours.

[0042] In the working state, the DC motor 7 is automatically started and stopped at an interval, when the DC motor 7 is started, the filter screen rotating shaft 6 is driven to rotate, the secondary filter screen 3 is rolled, the cleaning process of the secondary filter screen 3 is completed by the cleaning assembly 8, after the DC motor 7 is started, the power is cut off after a delay, under the action of the rebound force of the scroll piece 5, the position of the secondary filter screen 3 is reset; the adjusting spring 10 has a certain self-adapting ability, and in the filter screen cleaning process, the brush 12 can always be driven to maintain a certain compression force with the secondary filter screen 3, and the cleaning effect is improved.

[0043] Finally, it is to be explained that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the purpose and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A method for filtering oil in a hydraulic system oil return tank, using a multi-effect filtering device applied in the hydraulic system oil return tank, the multi-effect filtering device comprising connecting components at two ends, a first filter screen, a second filter screen and a third filter screen being arranged between the two connecting components, the second filter screen being located between the first filter screen and the third filter screen, characterized in that: the first filter screen is a coarse filter screen, the second filter screen is a medium filter screen, and the third filter screen is a fine filter screen. The secondary filter screen is made of flexible strong magnetic material, one of the connecting parts is provided with a scroll sheet, the other connecting part is provided with a filter screen rotating shaft, the filter screen rotating shaft is connected with a direct current motor, two ends of the secondary filter screen are connected with the scroll sheet and the filter screen rotating shaft respectively, and a cleaning assembly for cleaning the secondary filter screen is further arranged on the outer periphery of the filter screen rotating shaft. The method comprises the following steps: S1: separating the oil return tank into a clean oil area and an oil return area, and installing the multi-effect filtering device used in the oil return tank of the hydraulic system on the separation surface, so that the primary filter screen is located on one side of the oil return area and the tertiary filter screen is located on one side of the clean oil area; S2: starting the multi-effect filtering device used in the oil return tank of the hydraulic system to work synchronously with the hydraulic system, setting the starting frequency of the filter screen rotating shaft according to the working environment of the hydraulic system, so that the secondary filter screen is cleaned regularly.

2. The method of claim 1, wherein: The scroll sheet is wound by metal material with resilience, and is used to pull the secondary filter screen when the secondary filter screen loses the pulling force of the filter screen rotating shaft.

3. The method of claim 1, wherein: The cleaning assembly comprises a fixed plate vertically arranged on the outer periphery of the filter screen rotating shaft, a brush plate connected with the fixed plate through an adjusting spring, and brush hairs connected with the brush plate.

4. The method of claim 1, wherein: The primary filter screen and the tertiary filter screen are both connected with a plurality of spring devices, and the spring devices located on both sides of the secondary filter screen are in abutment with the secondary filter screen.

5. The method of claim 4, wherein: The spring device comprises a spring fixedly connected with the primary filter screen and the secondary filter screen, a wheel seat fixedly connected with the end of the spring, and a roller installed on the wheel seat, and the axis of the roller is horizontally arranged.

6. The method of claim 5, wherein: After the spring devices located on both sides of the secondary filter screen are in abutment with the secondary filter screen, the secondary filter screen forms a corrugated curved surface.

7. The method of claim 1, wherein, In step S2, the starting frequency of the filter screen rotating shaft is set to start once every 240-360 hours.

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