CN209875597U - Overflow valve with filter device for excavator main control valve - Google Patents
Overflow valve with filter device for excavator main control valve Download PDFInfo
- Publication number
- CN209875597U CN209875597U CN201920394147.1U CN201920394147U CN209875597U CN 209875597 U CN209875597 U CN 209875597U CN 201920394147 U CN201920394147 U CN 201920394147U CN 209875597 U CN209875597 U CN 209875597U
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- China
- Prior art keywords
- control valve
- seat
- valve
- valve seat
- hole
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- Expired - Fee Related
Links
- 238000007789 sealing Methods 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 44
- 239000010720 hydraulic oil Substances 0.000 description 8
- 230000003749 cleanliness Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- Details Of Valves (AREA)
Abstract
The utility model discloses a take filter equipment's overflow valve for excavator main control valve, a serial communication port, including control valve element, control valve element locates the front end of disk seat inner chamber, control valve element's front end and the inner chamber clearance fit of disk seat, disk seat inner chamber's rear end is connected with adjusting bolt's front end cooperation, be equipped with spring holder and spring in the inner chamber of disk seat, the rear end of control valve element is withstood through the spring holder to the one end of spring, adjusting bolt's front end is withstood to the other end of spring, be equipped with 4-6 oil feed inclined holes and 4-6 oil return holes on the disk seat, oil feed inclined hole and oil return hole are located the left and right sides of control valve element and disk seat clearance fit department respectively, the head of disk seat is fixed with the filter seat, all be equipped with the filter screen between the outer port of filter seat and every oil feed inclined hole, be equipped with the. The utility model discloses an overflow valve has and opens and close the characteristic well, and internal pressure is stable, receives external environment factor to influence little performance.
Description
Technical Field
The utility model relates to a hydraulic control valve especially relates to a take filter equipment's overflow valve for excavator main control valve, belongs to hydraulic means technical field.
Background
The overflow valve for the main control valve of the excavator is mainly used for controlling the highest working pressure of a hydraulic system and protecting the whole hydraulic system to be safe and reliable. According to the feedback of a client, the excavator often has the defect of incapability of walking after working for a period of time, and the overflow valve is found to have insufficient pressure through inspection. The investigation shows that: the excavator working environment is abominable, and operating personnel do not pay attention to reasons such as maintenance, often cause the hydraulic oil cleanliness not high, consequently cause the overflow valve to be stopped up by debris or burr, unable normal open, closed, lead to hydraulic system pressure to hang down excessively, unable normal work.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the problem of how to improve the hydraulic oil cleanliness that gets into the disk seat inner chamber is solved.
In order to solve the technical problem, the technical scheme of the utility model is to provide an overflow valve for an excavator main control valve with a filtering device, which is characterized by comprising a control valve core, wherein the control valve core is arranged at the front end of an inner cavity of a valve seat, the front end of the control valve core is in clearance fit with the inner cavity of the valve seat, the rear end of the inner cavity of the valve seat is in fit connection with the front end of an adjusting bolt, a spring seat and a spring are arranged in the inner cavity of the valve seat, one end of the spring is propped against the rear end of the control valve core through the spring seat, the other end of the spring is propped against the front end of the adjusting bolt, the valve seat is provided with 4-6 oil inlet inclined holes and 4-6 oil return inner holes, the oil inlet inclined holes and the oil return inner holes are respectively arranged at the left side and the right side of the clearance fit position of the, each oil inlet inclined hole is communicated with at least one small hole through a filter screen.
Preferably, the front end of the adjusting bolt extends into the inner cavity of the valve seat, and the outer circumferential surface of the adjusting bolt is connected with the inner wall of the valve seat in a matched manner.
Preferably, a first O-shaped sealing ring is arranged between the outer circumferential surface of the front end of the adjusting bolt and the inner wall of the inner cavity of the valve seat.
Preferably, the control valve core and the valve seat form a line seal.
Preferably, the adjusting bolt is locked and fixed on the valve seat through a locking nut and a nut.
Preferably, the oil return inner holes are uniformly distributed on the valve seat in the radial direction; the oil inlet inclined hole is obliquely arranged on the valve seat, the inner port of the oil inlet inclined hole is an inclined opening, and the inner port of the oil inlet inclined hole is arranged around the conical surface at the front end of the control valve core; the end part and/or the radial uniform distribution of the filter base are/is provided with small holes, and the number of the small holes is not less than that of the oil inlet inclined holes.
Preferably, the oil inlet inclined hole and the oil return inner hole are sealed by a check ring clamped on the outer side of the valve seat and a third O-shaped sealing ring; and a second O-shaped sealing ring for sealing the valve seat and the main control valve body is also arranged on the outer side of the valve seat.
Preferably, the structure of the filter screen is an umbrella-shaped structure, and a round hole is formed in the middle of the filter screen; the filtering precision of the filter screen is 20-25 mu m; the material of the filter screen is 40 Cr; 2-4 layers of 60-mesh or 80-mesh filter screens are arranged between the valve seat and the filter seat; the total thickness of the filter screen between the valve seat and the filter seat is 0.8-1.6 mm.
Preferably, the inner cavity of the valve seat is provided with three cylindrical inner holes with different sizes, the adjusting bolt is tightly matched and connected with a first inner hole of the valve seat, and a first O-shaped sealing ring for sealing is arranged in the first inner hole; the spring seat and the control valve core are positioned in the second inner hole, and a second O-shaped sealing ring is arranged outside the second inner hole; the rightmost end of the control valve core is in clearance fit with a third inner hole, and a chamfer edge matched with the control valve core is arranged on an orifice of the third inner hole connected with the second inner hole.
Preferably, the structure of the control valve core is that from left to right: a first cylindrical surface, a conical surface, a second cylindrical surface and a third cylindrical surface; the first cylindrical surface is connected with the spring seat in a matching way; the conical surface is matched with an orifice chamfer edge of a third inner hole of the valve seat to form line sealing; the second cylindrical surface is connected with the conical surface and the third cylindrical surface, and the diameter size of the second cylindrical surface is smaller than that of the third cylindrical surface; the third cylindrical surface is in clearance fit with a third inner hole of the valve seat.
The utility model discloses an overflow valve compact structure, sealing performance are good, have sealedly between oil inlet and the oil return opening, and the disk seat has sealedly with the external world. The sealing performance is good, the line sealing of the conical surface and the chamfer edge of the valve hole is adopted, and the opening performance of the valve core is more than 98%. Meanwhile, the filter screen is arranged at the oil inlet inclined hole, so that the phenomena of blocking and clamping the valve core caused by the cleanliness of hydraulic oil can be greatly reduced, and the service life of the main control valve and the working stability of the excavator are ensured. The utility model discloses an overflow valve has and opens and close the characteristic well, and internal pressure is stable, receives external environment factor to influence little performance.
Drawings
Fig. 1 is a schematic structural diagram of an overflow valve for an excavator main control valve with a filtering device.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
The utility model relates to a take filter equipment's overflow valve for excavator main control valve, as shown in fig. 1, it includes control valve core 9, and control valve core 9 locates the front end of 4 inner chambers of disk seat, and control valve core 9's front end and 4 inner chamber clearance fit of disk seat, hydraulic oil from fit clearance entering control valve core 9 foremost, open control valve core 9 after reaching the set pressure. The spring seat 8 is arranged at the rear end of the control valve core 9, the spring force is applied to the control valve core 9, and the control valve core 9 is in a closed state under a normal state and forms a linear seal with the valve seat 4. One end of the spring 7 props against the rear end of the control valve core 9 through the spring seat 8, the other end of the spring 7 props against the front end of the adjusting bolt 1, namely one end of the spring 7 is connected with the spring seat 8, and the other end of the spring is connected to the adjusting bolt 1. The spring seat 8 and the spring 7 are arranged in the inner cavity of the valve seat 4, the front end of the adjusting bolt 1 extends into the inner cavity of the valve seat 4, the outer circumferential surface of the adjusting bolt is precisely matched with the inner wall of the valve seat 4, and the first O-shaped sealing ring 5 is arranged between the outer circumferential surface of the adjusting bolt and the inner wall of the valve seat 4 to prevent external foreign matters and air from entering and prevent the overflow valve from leaking oil. The adjusting bolt 1 is locked and fixed on the valve seat 4 through a locking nut 2 and a nut 3. The valve seat 4 is provided with 6 oil inlet inclined holes P and 6 oil return inner holes T, the oil inlet inclined holes P and the oil return inner holes T are respectively positioned at the left side and the right side of the clearance fit position of the control valve core 9 and the valve seat 4, the oil return inner holes T are radially and uniformly distributed on the valve seat 4, the oil inlet inclined holes P are obliquely arranged on the valve seat 4, the inner ports of the oil inlet inclined holes P are inclined ports, and the inner ports of the oil inlet inclined holes P are arranged around the conical surface at the front end of the control valve core 9. The oil inlet inclined hole P and the oil return inner hole T are sealed through a check ring 10 clamped on the outer side of the valve seat 4 and a third O-shaped sealing ring 11. And a second O-shaped sealing ring 6 is arranged at the bottom of the external thread on the outer side of the valve seat 4, so that the valve seat and the main control valve body are sealed. A filter base 13 is fixed at the head of the valve base 4, a filter screen 12 is arranged between the filter base 13 and the outer port of each oil inlet inclined hole P, the filter screen 12 is pressed by the filter base 13, and the filter screen 12 is pressed on the outer port of the oil inlet inclined hole P through the filter base 13. The filter screen 12 is completely arranged at the upper part of the oil inlet inclined hole P of the valve seat 4 to prevent impurities and pollutants from entering the overflow valve.
2-4 layers of 60-mesh or 80-mesh filter screens 12 made of 40Cr and having the filtering precision of 20-25 mu m are arranged between the valve seat 4 and the filter seat 13, the filter screens 12 are of umbrella-shaped structures, the total thickness of all the filter screens 12 is 0.8-1.6mm, and circular holes are formed in the middles. The filter base 13 is connected with the valve base 4 through threads, and at least 6 small holes are distributed on the filter base 13 and are uniformly distributed in the radial direction; at least 6 evenly distributed small holes are distributed at the end part of the filter base 13. The hydraulic oil enters the filter base 13 through the small holes, is filtered by the filter screen 12 and then flows into the overflow valve. Each oil inlet inclined hole P is communicated with at least one small hole through the filter screen 12, and the number of the small holes is not less than that of the oil inlet inclined holes P.
The inner cavity of the valve seat 4 is provided with three cylindrical inner holes with different sizes, the adjusting bolt 1 is tightly matched and connected with a first inner hole of the valve seat 4, and a first O-shaped sealing ring 5 is arranged in the first inner hole to play a role in sealing; the spring seat 8 and the control valve core 9 are positioned in the second inner hole, and a second O-shaped sealing ring 6 is arranged outside the second inner hole; the rightmost end of the control valve core 9 is in clearance fit with the third inner hole, and a small fit clearance is reserved, so that hydraulic oil can enter conveniently and the overflow valve is opened; and a chamfer edge matched with the control valve core 9 is arranged at an orifice connected with the second inner hole on the third inner hole.
The structure of the control valve core 9 is that from left to right: a first cylindrical surface, a conical surface, a second cylindrical surface, and a third cylindrical surface. Wherein the first cylindrical surface is matched with the spring seat 8 and applies spring force to prop against the control valve core 9. The conical surface is matched with the orifice chamfer edge of the third inner hole of the valve seat 4 to form line sealing. The second cylindrical surface is connected with the conical surface and the third cylindrical surface, wherein the diameter size of the second cylindrical surface is the smallest, namely, the diameter size of the second cylindrical surface is smaller than that of the third cylindrical surface, so that the hydraulic oil entering from the oil inlet inclined hole P can be conveniently stored. The third cylindrical surface is in clearance fit with a third inner hole of the valve seat 4, so that the guiding function is achieved, hydraulic oil can enter the rightmost end of the control valve core 9, and the overflow valve is opened.
The working process of the utility model is as follows:
in a normal state, the control valve core 9 separates the oil inlet inclined hole P from the oil return inner hole T under the action of the spring 7; when the oil pressure of the oil inlet inclined hole P exceeds the set pressure of the control valve core 9, the control valve core 9 is rapidly opened, the oil inlet inclined hole P is communicated with the oil return inner hole T, and high-pressure oil of the oil inlet inclined hole P is rapidly discharged to the oil return inner hole T, so that the safety protection effect is achieved.
Example 2
In this embodiment, be equipped with 4 oil feed inclined holes P and 4 oil return hole T on the disk seat 4. Each oil inlet inclined hole P is communicated with a small hole on one filter base 13 through a filter screen 12. 4 layers of 60-mesh filter screens 12 are arranged between the valve seat 4 and the filter seat 13, the filtering precision of the filter screens 12 is 25 mu m, and the total thickness of all the filter screens 12 is 1.6 mm.
The rest is the same as in example 1.
Example 3
In this embodiment, 2 layers of 60-mesh filter screens 12 are arranged between the valve seat 4 and the filter seat 13, the filtering precision of the filter screens 12 is 20 μm, and the total thickness of all the filter screens 12 is 0.8 mm.
The rest is the same as in example 1.
Example 4
In this embodiment, a 2-layer 80-mesh filter screen 12 is provided between the valve seat 4 and the filter seat 13, and the filter accuracy of the filter screen 12 is 20 μm.
The rest is the same as in example 1.
Claims (10)
1. An overflow valve with a filtering device for an excavator main control valve is characterized by comprising a control valve core (9), wherein the control valve core (9) is arranged at the front end of an inner cavity of a valve seat (4), the front end of the control valve core (9) is in clearance fit with the inner cavity of the valve seat (4), the rear end of the inner cavity of the valve seat (4) is in fit connection with the front end of an adjusting bolt (1), a spring seat (8) and a spring (7) are arranged in the inner cavity of the valve seat (4), one end of the spring (7) is propped against the rear end of the control valve core (9) through the spring seat (8), the other end of the spring (7) is propped against the front end of the adjusting bolt (1), 4-6 oil inlet inclined holes (P) and 4-6 oil return inner holes (T) are arranged on the valve seat (4), and the oil inlet inclined holes (P) and the oil return inner holes (T) are respectively arranged at the, the head of the valve seat (4) is fixed with a filter seat (13), a filter screen (12) is arranged between the filter seat (13) and the outer port of each oil inlet inclined hole (P), small holes are formed in the filter seat (13), and each oil inlet inclined hole (P) is communicated with at least one small hole through the filter screen (12).
2. The overflow valve with the filtering device for the excavator main control valve is characterized in that the front end of the adjusting bolt (1) extends into the inner cavity of the valve seat (4), and the outer circumferential surface of the adjusting bolt (1) is matched and connected with the inner wall of the valve seat (4).
3. The overflow valve for the excavator main control valve with the filtering device as claimed in claim 1 or 2, wherein a first O-shaped sealing ring (5) is arranged between the outer circumferential surface of the front end of the adjusting bolt (1) and the inner wall of the inner cavity of the valve seat (4).
4. The overflow valve with the filtering device for the excavator main control valve is characterized in that the control valve core (9) and the valve seat (4) form a line seal.
5. The overflow valve with the filtering device for the excavator main control valve is characterized in that the adjusting bolt (1) is locked and fixed on the valve seat (4) through a locking nut (2) and a nut (3).
6. The overflow valve with the filtering device for the excavator main control valve is characterized in that oil return inner holes (T) are radially and uniformly distributed on the valve seat (4); the oil inlet inclined hole (P) is obliquely arranged on the valve seat (4), an inner port of the oil inlet inclined hole (P) is an inclined port, and the inner port of the oil inlet inclined hole (P) is arranged around a conical surface at the front end of the control valve core (9); the end part and/or the radial uniform distribution of the filter base (13) are/is provided with small holes, and the number of the small holes is not less than that of the oil inlet inclined holes (P).
7. The overflow valve with the filtering device for the excavator main control valve is characterized in that the oil inlet inclined hole (P) and the oil return inner hole (T) are sealed by a retainer ring (10) clamped outside the valve seat (4) and a third O-shaped sealing ring (11); and a second O-shaped sealing ring (6) for sealing the valve seat (4) and the main control valve body is also arranged on the outer side of the valve seat.
8. The overflow valve for the excavator main control valve with the filtering device is characterized in that the structure of the filtering net (12) is an umbrella-shaped structure, and a round hole is formed in the middle of the filtering net (12); the filtering precision of the filter screen (12) is 20-25 μm; the material of the filter screen (12) is 40 Cr; 2-4 layers of 60-mesh or 80-mesh filter screens (12) are arranged between the valve seat (4) and the filter seat (13); the total thickness of the filter screen (12) between the valve seat (4) and the filter seat (13) is 0.8-1.6 mm.
9. The overflow valve with the filtering device for the excavator main control valve is characterized in that the inner cavity of the valve seat (4) is provided with three cylindrical inner holes with different sizes, the adjusting bolt (1) is tightly matched and connected with a first inner hole of the valve seat (4), and a first O-shaped sealing ring (5) with a sealing function is arranged in the first inner hole; the spring seat (8) and the control valve core (9) are positioned in the second inner hole, and a second O-shaped sealing ring (6) is arranged outside the second inner hole; the rightmost end of the control valve core (9) is in clearance fit with a third inner hole, and a hole opening connected with the second inner hole on the third inner hole is provided with a chamfer edge matched with the control valve core (9).
10. The overflow valve for the excavator main control valve with the filtering device as claimed in claim 9, wherein the structure of the control valve core (9) is that from left to right: a first cylindrical surface, a conical surface, a second cylindrical surface and a third cylindrical surface; the first cylindrical surface is connected with a spring seat (8) in a matching way; the conical surface is matched with an orifice chamfer edge of a third inner hole of the valve seat (4) to form linear sealing; the second cylindrical surface is connected with the conical surface and the third cylindrical surface, and the diameter size of the second cylindrical surface is smaller than that of the third cylindrical surface; the third cylindrical surface is in clearance fit with a third inner hole of the valve seat (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920394147.1U CN209875597U (en) | 2019-03-26 | 2019-03-26 | Overflow valve with filter device for excavator main control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920394147.1U CN209875597U (en) | 2019-03-26 | 2019-03-26 | Overflow valve with filter device for excavator main control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209875597U true CN209875597U (en) | 2019-12-31 |
Family
ID=68956767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920394147.1U Expired - Fee Related CN209875597U (en) | 2019-03-26 | 2019-03-26 | Overflow valve with filter device for excavator main control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209875597U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005653A (en) * | 2019-03-26 | 2019-07-12 | 龙工（上海）精工液压有限公司 | Overflow valve for excavator main control valve with filter device |
-
2019
- 2019-03-26 CN CN201920394147.1U patent/CN209875597U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110005653A (en) * | 2019-03-26 | 2019-07-12 | 龙工（上海）精工液压有限公司 | Overflow valve for excavator main control valve with filter device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191231 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |