CN112797052A - Filtering capacity slow-release type hydraulic oil return filter element - Google Patents
Filtering capacity slow-release type hydraulic oil return filter element Download PDFInfo
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- CN112797052A CN112797052A CN202011376639.1A CN202011376639A CN112797052A CN 112797052 A CN112797052 A CN 112797052A CN 202011376639 A CN202011376639 A CN 202011376639A CN 112797052 A CN112797052 A CN 112797052A
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- filter material
- filtering capacity
- filter element
- hydraulic oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
Abstract
The disclosure relates to the technical field of hydraulic system accessories, in particular to a filtering capacity slow-release type hydraulic oil return filter element, which comprises a protective net and a metal mesh filtering material which are coaxially arranged, and an upper cover assembly and a lower cover assembly which are arranged at two ends; the metal mesh filter material is provided with a plurality of coaxial cylindrical filter material layers, and a certain distance is reserved between every two adjacent cylindrical filter material layers to form an annular cavity; an oil passing channel is arranged on the cylindrical filter material layer between the adjacent annular cavities, and a valve is arranged on the oil passing channel to control the opening and the closing; the valve is composed of elastic blocking pieces, and when the pressure difference between adjacent annular cavities is larger than a set value, the valve is opened. The filtering capacity of the thicker metal mesh filtering material is gradually released, so that the filtering capacity is used one by one, the filtering capacity of each part is fully exerted, and the problem of resistance increase in the operation process caused by the improvement of the filtering capacity is solved.
Description
Technical Field
The disclosure relates to the technical field of hydraulic system accessories, in particular to a filtering capacity slow-release type hydraulic oil return filter element.
Background
In the field of hydraulic systems, such as the field of hydraulic systems of engineering machinery, a hydraulic oil return filter element is arranged in an oil way of the hydraulic system, mechanical impurities such as metal powder in the hydraulic system are removed, the oil way is kept clean, and the service life of the hydraulic system is prolonged. The filter material of the hydraulic oil return filter element comprises a metal mesh filter material, a filter paper filter material and the like, wherein the metal mesh filter element can be cleaned and has certain reusability. Compared with the filter element made of the filter paper filter material, the filter element made of the metal mesh filter material has excellent physical performance, can endure the pressure fluctuation of a hydraulic system, can be cleaned and can be recycled to a certain degree.
As the filter material continuously adsorbs impurities in the filtering process, the over resistance is increased, the filtering capacity is reduced, and the thickness of the metal mesh filter material is limited by the two aspects of the filtering capacity and the resistance. On the one hand, the membrane cannot be too thin, and if the membrane is too thin, the filtering capacity cannot meet the requirement. On the other hand, the thickness is not too large, but if the thickness is too thick, the filtering capacity can be improved, but the resistance gradually increases along with the increase of the service time, when the outer adsorption gradually reaches full load, the resistance is so large that the filter element needs to be cleaned or replaced, and the filter material on the inner side does not fully exert the adsorption capacity, thereby causing waste.
Disclosure of Invention
The filtering capacity slow-release type hydraulic oil return filter element aims to solve the problems that the filter element made of the existing metal mesh filtering material is prolonged in service time and gradually increased in resistance, so that the thickness of the metal mesh filtering material is limited by two aspects of filtering capacity and resistance, the thickness is limited, and the filtering performance is limited.
The filtering ability of the present invention means an ability to adsorb impurities.
A filtering capacity slow-release type hydraulic oil return filter element comprises a protective net and a metal mesh filtering material which are coaxially arranged, and an upper cover component and a lower cover component which are arranged at two ends;
the metal mesh filter material is provided with a plurality of coaxial cylindrical filter material layers, and a certain distance is reserved between every two adjacent cylindrical filter material layers to form an annular cavity;
an oil passing channel is arranged on the cylindrical filter material layer between the adjacent annular cavities, and a valve is arranged on the oil passing channel to control the opening and the closing;
the valve is composed of elastic blocking pieces, and when the pressure difference between adjacent annular cavities is larger than a set value, the valve is opened.
In a further improvement, the oil passage is made of a copper pipe and is embedded in the cylindrical filter material layer;
each cylindrical filter material layer is provided with a plurality of oil passing channels, and the center lines of the oil passing channels point to and are perpendicular to the axis of the cylindrical filter material layer.
In a further improvement, flanges are arranged on the parts, exposed out of the inner wall and the outer wall of the cylindrical filter material layer, of the two ends of the copper pipe of the oil passing channel, and the flanges are attached to the inner wall and the outer wall of the cylindrical filter material layer to form attachment parts.
In a further improvement, an elastic baffle is arranged at an outlet of the oil channel, which is positioned on the inner wall of the cylindrical filter material layer, and the elastic baffle is used as a valve.
The improved structure is characterized in that the elastic baffle comprises a baffle handle and a baffle body fixedly connected with the baffle handle, and the baffle handle has certain elasticity;
the separation blade handle is arranged on the back pasting part, and the shape of the separation blade body is consistent with that of a passage opening of the oil passage.
In a further improvement, the baffle plate handle is fixedly connected with the sticking back part.
In a further improvement, the baffle plate handle is in limit hinge connection with the sticking back part,
the meaning of the limiting hinge is as follows: when the force applied to the blocking sheet handle exceeds a set threshold value, the blocking sheet handle at the hinged part rotates relative to the sticking back part.
In a further improvement, the hinge hole of the sticking back part is provided with a hinge shaft matched with the hinge hole, and one side of the hinge shaft facing the sticking back part is provided with an arc-shaped convex rib.
The rubber gasket is fixedly clamped in an inner ring of the inner cover of the upper cover and can be in movable contact with the outer cover of the upper cover;
an outward annular groove is formed in the outer side of the rubber pad and corresponds to the outward annular groove, a blocking ring is arranged on the outer cover of the upper cover, and the rubber pad can be sleeved on the blocking ring through the outward annular groove;
the inner side of the rubber pad is provided with three inward annular grooves for respectively clamping the outer edges of the three cylindrical filter material layers during installation and assisting in fixing the cylindrical filter material layers.
In a further improvement, the cross section of the oil passing channel is square.
The baffle plate handle is arranged on one side of the long-strip-shaped outlet of the oil passage.
The beneficial effect of this disclosure does:
the filtering capacity slow-release type hydraulic oil return filter element provided by the invention gradually releases the filtering capacity of a thicker metal mesh filtering material, so that the filtering capacity is used by one part, the filtering capacity of each part is fully exerted, and the problem of resistance increase in the operation process caused by the improvement of the filtering capacity is solved.
The filtering capacity slow-release type hydraulic oil return filter element provided by the invention solves the contradiction that the thickness of the metal mesh filtering material is limited by two aspects of filtering capacity and resistance because the filter element made of the existing metal mesh filtering material is increased in service time and resistance is gradually increased, and the increase of the thickness is not limited by the increase of the resistance any more.
The invention further adopts a limiting hinge mode for the separation blade handle and the back patch, and after the valve is opened by pressure difference, the valve does not have resilience any more, thereby avoiding the problem of resistance increase caused by the valve structure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic view of the overall fit of a filtering capacity slow-release type hydraulic oil return filter element disclosed in embodiment 1 of the invention;
FIG. 2 is a schematic structural view of a tubular metal mesh filter disclosed in embodiment 1 of the present invention;
FIG. 3 is a longitudinal section of one side of a cylindrical metal mesh filter according to example 1 of the present invention;
FIG. 4 is an enlarged view of a portion A of FIG. 3;
fig. 5 is a cross-sectional view of the filter cartridge cover assembly of example 1 of the present invention.
Fig. 6 is a schematic diagram of a limit hinge structure in embodiment 2 of the present invention;
in the figure, 1, a bypass valve assembly, 2, a filter element upper cover assembly, 21, an upper cover outer cover, 22, an upper cover inner cover, 23, a rubber pad, 24, a check ring, 3, an outer protecting net, 4, a metal mesh filtering material, 41, a cylindrical filtering material layer, 42, an annular cavity, 43, an oil passing channel, 44, a valve flap, 45, a back pasting part, 46, a baffle handle, 47, a baffle body, 48, a hinge hole, 49, an arc-shaped convex edge, 5, an inner protecting net, 6, a support ring, 7 and a filter element lower cover assembly.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate description of the disclosure and simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the disclosure.
The present invention takes into account the following problems encountered in the prior art:
as the filter material continuously adsorbs impurities in the filtering process, the over resistance is increased, the filtering capacity is reduced, and the thickness of the metal mesh filter material is limited by the two aspects of the filtering capacity and the resistance. On the one hand, the membrane cannot be too thin, and if the membrane is too thin, the filtering capacity cannot meet the requirement. On the other hand, the thickness is not too large, but if the thickness is too thick, the filtering capacity can be improved, but the resistance gradually increases along with the increase of time, when the outer adsorption gradually reaches full load, the resistance is so large that the filter element needs to be cleaned or replaced, and the filter material on the inner side does not fully exert the adsorption capacity, thereby causing waste.
In order to solve the technical contradiction, the filtering capacity of the thicker metal mesh filtering material is gradually released, so that the filtering capacity is used one by one, the filtering capacity of each part is fully exerted, and the problem of increased resistance in the operation process caused by the improvement of the filtering capacity is solved.
Example 1
The filtering capacity slow-release type hydraulic oil return filter element provided by the first embodiment of the invention is a typical implementation mode.
The filtering capacity slow-release type hydraulic oil return filter element has an integral structure similar to that of an existing hydraulic oil return filter element, and comprises a bypass valve component 1, a filter element upper cover component 2, an outer protecting net 3, a metal mesh filtering material 4, an inner protecting net 5, a supporting ring 6 and a filter element lower cover component 7, wherein the outer protecting net 3, the metal mesh filtering material 4, the inner protecting net 5, the supporting ring 6 and the filter element lower cover component are coaxially.
As shown in fig. 2, this embodiment is an improvement of a metal mesh filter, which has three coaxial cylindrical filter layers 41, and the adjacent cylindrical filter layers 41 have a certain distance therebetween to form an annular cavity 42. The cylindrical filter material layers can be fixed by additionally arranging a protective net (not shown in the figure), and the protective net is arranged in a manner of fixing an outer protective net and an inner protective net.
As shown in fig. 3, a longitudinal section of one side of the cylindrical metal mesh filter material is shown, an oil passage 43 is arranged on the cylindrical filter material layer between the adjacent annular cavities 42, and a flap valve 44 is arranged on the oil passage to control the opening and the closing; the valve is composed of elastic blocking pieces, and when the pressure difference between adjacent annular cavities is larger than a set value, the valve is opened.
The slow release principle of the filtering capacity is as follows:
when the filter element is just replaced, the resistance of the metal mesh filter material is small, hydraulic oil can smoothly pass through and be filtered by the metal mesh filter material layer (the left side in the figure) which is firstly contacted with hydraulic return oil, the resistance of the filtered hydraulic oil is smaller in the filter material layers (the middle and the right side in the figure) which pass through subsequently due to the fact that the filtered hydraulic oil is filtered once, and all the valve valves are in a closed state.
After operation a period of time, the adsorbed impurity in this woven metal mesh filter media layer reaches certain limit, and the resistance grow makes the poor grow of this woven metal mesh filter media layer lamination, is greater than the opening pressure of valve design, and the valve is opened, and hydraulic oil gets into the cavity of first (left side), begins to consume the filter capacity on woven metal mesh filter media layer in the middle of, and its process is as the process of resistance by little grow in the last woven metal mesh filter media layer filtering process. The remaining one of the layers of expanded metal filter material is then exhausted of its filtering capacity.
Through the process, the filtering capacity of the filtering material is consumed in a layered mode, the requirement of the filtering performance is met, meanwhile, the problem that the resistance is increased along with the increase of the operation time under the condition that the thickness is increased is solved, and the limitation that the thickness of the metal mesh filtering material layer is increased and the filtering performance is improved is removed.
The specific structure of oil passing channel and valve:
as shown in fig. 4, the oil passage 43 is made of a copper pipe and is embedded in the cylindrical filter layer.
Each cylindrical filter material layer is provided with a plurality of oil passing channels 43, the cross section of each oil passing channel is circular, and the center lines of the oil passing channels point to and are perpendicular to the axis of the cylindrical filter material layer. Flanges are arranged on the parts of the two ends of the copper pipe of the oil passage, which are exposed out of the inner wall and the outer wall of the cylindrical filter material layer, and the flanges are attached to the inner wall and the outer wall of the cylindrical filter material layer to form a back attachment part 45. An elastic baffle is arranged at an outlet of the oil channel, which is positioned on the inner wall of the cylindrical filter material layer, and is used as a valve. The elastic baffle comprises a baffle handle 46 and a baffle body 47 fixedly connected with the baffle handle, and the baffle handle has certain elasticity; the baffle handle 46 is arranged on the back pasting part 45, and the shape of the baffle body is consistent with the shape of the passage opening of the oil passage.
In this embodiment, separation blade handle and back subsides portion fixed connection reach certain limit as the adsorbed impurity in metal mesh filter media layer, and the resistance grow, metal mesh filter media layer both sides pressure differential grow, and its elasticity is overcome to the separation blade handle under great thrust effect, takes the separation blade body to leave original position, and the valve is opened. After the baffle plate is opened, besides pressure, flowing hydraulic oil also gives a certain impact force to the baffle plate body, so that the baffle plate body is in an opening state. In order for the valve to open, the inner sheath is required to be open at the valve position.
As shown in fig. 5, the rubber pad 23 is fixedly engaged with the inner ring of the inner cap 22 and is capable of being movably contacted with the outer cap 21.
The outside of rubber pad 23 sets up outside annular groove, and corresponding with this outside annular groove, upper cover enclosing cover 21 is equipped with stop ring 24, and rubber pad 23 can be through outside annular groove cover on stop ring 24, and the effect can prevent the problem that traditional gluing connects and easily drops.
The inboard of rubber pad 23 sets up three inward annular groove for block the outer fringe on three tube-shape filter medium layer respectively when the installation, the supplementary fixed tube-shape filter medium layer improves the stability of filter core.
The upper cover outer cover 21 and the upper cover inner cover 22 are still detachably fixed by using the conventional bolt (not shown in the figure). The filter element lower cover component 7 can also be provided with the same rubber pad to fix the cylindrical filter material layer.
Example 2
The second embodiment of the present invention is an improvement over embodiment 1.
The valve of embodiment 1 adopts the structure of the elastic baffle handle and the baffle body, and the problem that the opening and closing are not easy to be fully opened under the control of the elastic baffle handle also exists. This is because the magnitude of the elastic force has a large positive correlation with the change, and after the opening, the valve opens a larger opening degree only when the pressure difference becomes larger, and the further increase of the pressure difference means that the resistance continues to become larger, thereby weakening the effect of reducing the resistance.
In order to solve the problem in embodiment 1, the second embodiment of the present invention provides a limit hinge connection between the flap handle and the attachment portion. And the stop hinge is limited, namely when the force applied to the blocking sheet handle exceeds a set threshold value, the blocking sheet handle at the hinge is rotated relative to the back pasting part.
The specific structure is shown in fig. 6, the retrofitting part is provided with a hinge hole 48 which is shown by a dotted line in the figure; the stopper handle 46 has a hinge shaft fitted to the hinge hole, and an arc-shaped rib 49 is provided on a side of the hinge shaft facing the attachment portion, the arc-shaped rib 49 is made of an elastic iron sheet, when the hinge shaft rotates, the arc-shaped rib 49 abuts against a surface of the attachment portion to block the hinge shaft from continuing to rotate, and when a force for rotating the hinge shaft is further increased, the arc-shaped rib 49 is elastically deformed to cross the resistance region and then returns to its original shape.
The separation blade handle does not adopt spacing articulated mode with sticking back, makes the valve of valve open the back when pressure differential, no longer has the elasticity of resilience, has avoided the problem of the increase resistance that leads to by valve structure.
It should be noted that, when the impurity that metal mesh filter media layer adsorbs reaches certain limit, the resistance is the grow only, and the separation is not, and the valve also does not need complete absolute seal when closing, need not be very strict to sealing performance, and it can open to reach certain degree at metal mesh filter media layer twice differential pressure.
In other embodiments, the oil passage channel can also be made into a square or vertical long strip shape. The baffle plate handle can be arranged above, below or on one side of the oil passage opening.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A filtering capacity slow-release type hydraulic oil return filter element comprises a protective net and a metal mesh filtering material which are coaxially arranged, an upper cover component and a lower cover component which are arranged at two ends, and is characterized in that,
the metal mesh filter material is provided with a plurality of coaxial cylindrical filter material layers, and a certain distance is reserved between every two adjacent cylindrical filter material layers to form an annular cavity;
an oil passing channel is arranged on the cylindrical filter material layer between the adjacent annular cavities, and a valve is arranged on the oil passing channel to control the opening and the closing;
the valve is composed of elastic blocking pieces, and when the pressure difference between adjacent annular cavities is larger than a set value, the valve is opened.
2. The hydraulic oil return filter element with the slow-release filtering capacity of claim 1, wherein the oil passing channel is made of a copper pipe and is embedded in the cylindrical filter material layer;
each cylindrical filter material layer is provided with a plurality of oil passing channels, and the center lines of the oil passing channels point to and are perpendicular to the axis of the cylindrical filter material layer.
3. The hydraulic oil return filter element with the slow-release filtering capacity as claimed in claim 2, wherein flanges are arranged at the parts, exposed out of the inner wall and the outer wall of the cylindrical filter material layer, of the two ends of the copper pipe of the oil passage, and the flanges are attached to the inner wall and the outer wall of the cylindrical filter material layer to form attachment parts.
4. The hydraulic oil return filter element with the slow-release filtering capacity of claim 3, wherein an elastic baffle plate is arranged at an outlet of the oil channel, which is positioned on the inner wall of the cylindrical filter material layer, and is used as a valve.
5. The hydraulic oil return filter element with the slow-release filtering capacity of claim 4, wherein the elastic baffle comprises a baffle handle and a baffle body fixedly connected with the baffle handle, and the baffle handle has certain elasticity;
the separation blade handle is arranged on the back pasting part, and the shape of the separation blade body is consistent with that of a passage opening of the oil passage.
6. The hydraulic oil return filter element with slow-release filtering capacity of claim 5, wherein the baffle handle is fixedly connected with the back attachment part.
7. The hydraulic oil return filter element with slow-release filtering capacity of claim 5, wherein the baffle handle is in limit hinge connection with the back attachment part,
the meaning of the limiting hinge is as follows: when the force applied to the blocking sheet handle exceeds a set threshold value, the blocking sheet handle at the hinged part rotates relative to the sticking back part.
8. The hydraulic oil return filter element with slow-release filtering capacity of claim 7, wherein the hinge hole of the back pasting part, the baffle handle is provided with a hinge shaft matched with the hinge hole, and an arc-shaped rib is arranged on one side of the hinge shaft facing the back pasting part.
9. The hydraulic oil return filter element with slow-release filtering capacity of any one of claims 1 to 8, wherein the upper cover assembly comprises an upper cover outer cover, an upper cover inner cover and a rubber pad, and the rubber pad is fixedly clamped in an inner ring of the upper cover inner cover and can be in movable contact with the upper cover outer cover;
an outward annular groove is formed in the outer side of the rubber pad and corresponds to the outward annular groove, a blocking ring is arranged on the outer cover of the upper cover, and the rubber pad can be sleeved on the blocking ring through the outward annular groove;
the inner side of the rubber pad is provided with three inward annular grooves for respectively clamping the outer edges of the three cylindrical filter material layers during installation and assisting in fixing the cylindrical filter material layers.
10. The hydraulic oil return filter element with slow-release filter capacity as claimed in any one of claims 7 to 8, wherein the cross section of the oil passage is square,
the baffle plate handle is arranged on one side of the long-strip-shaped outlet of the oil passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011376639.1A CN112797052B (en) | 2021-03-17 | 2021-03-17 | Filter capacity slow-release type hydraulic oil return filter element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011376639.1A CN112797052B (en) | 2021-03-17 | 2021-03-17 | Filter capacity slow-release type hydraulic oil return filter element |
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| Publication Number | Publication Date |
|---|---|
| CN112797052A true CN112797052A (en) | 2021-05-14 |
| CN112797052B CN112797052B (en) | 2023-09-22 |
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| CN202011376639.1A Active CN112797052B (en) | 2021-03-17 | 2021-03-17 | Filter capacity slow-release type hydraulic oil return filter element |
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| US20030178351A1 (en) * | 2002-03-19 | 2003-09-25 | Doyle E. Michael | Multi-stage EDM filter |
| US20040149636A1 (en) * | 2003-02-03 | 2004-08-05 | Backes Kari A. | Filtration device with pressure-activated means for bypassing serial filter layers |
| CN1712359A (en) * | 2004-06-22 | 2005-12-28 | 唐伟钊 | Automatic quality graded water supply method from cleanway filtering material style |
| JP2007205251A (en) * | 2006-02-01 | 2007-08-16 | Tokyo Roki Co Ltd | Valve structure of relief valve for oil filter |
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| CN107497168A (en) * | 2017-08-21 | 2017-12-22 | 赛洛克流体设备成都有限公司 | Filter with efficient filter core |
| CN208900153U (en) * | 2018-03-29 | 2019-05-24 | 杭州菲特设备制造有限公司 | A kind of two-layer magnetic filtering oil filter |
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2021
- 2021-03-17 CN CN202011376639.1A patent/CN112797052B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030178351A1 (en) * | 2002-03-19 | 2003-09-25 | Doyle E. Michael | Multi-stage EDM filter |
| US20040149636A1 (en) * | 2003-02-03 | 2004-08-05 | Backes Kari A. | Filtration device with pressure-activated means for bypassing serial filter layers |
| CN1712359A (en) * | 2004-06-22 | 2005-12-28 | 唐伟钊 | Automatic quality graded water supply method from cleanway filtering material style |
| JP2007205251A (en) * | 2006-02-01 | 2007-08-16 | Tokyo Roki Co Ltd | Valve structure of relief valve for oil filter |
| CN202590464U (en) * | 2012-05-28 | 2012-12-12 | 张轶伦 | Self-cleaning filter device for multiple stages of strainers |
| CN102698488A (en) * | 2012-06-12 | 2012-10-03 | 蔡圣佳 | Automatic residue discharging filter |
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| Publication number | Publication date |
|---|---|
| CN112797052B (en) | 2023-09-22 |
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