CN115012470A - Novel valve rod regeneration structure for load sensitive valve - Google Patents
Novel valve rod regeneration structure for load sensitive valve Download PDFInfo
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- CN115012470A CN115012470A CN202210677755.XA CN202210677755A CN115012470A CN 115012470 A CN115012470 A CN 115012470A CN 202210677755 A CN202210677755 A CN 202210677755A CN 115012470 A CN115012470 A CN 115012470A
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- regeneration
- valve
- valve rod
- cylindrical hole
- hole
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
Abstract
The invention relates to a novel valve rod regeneration structure for a load-sensitive valve, which belongs to the technical field of hydraulic devices and comprises a regeneration valve rod, wherein an inner hole of the regeneration valve rod comprises a first cylindrical hole, a second cylindrical hole, a third cylindrical hole and a fourth cylindrical hole, wherein the first cylindrical hole, the second cylindrical hole, the third cylindrical hole and the fourth cylindrical hole are axially communicated with each other, and the diameters of the first cylindrical hole, the second cylindrical hole, the third cylindrical hole and the fourth cylindrical hole are sequentially reduced; a small valve core capable of sliding, a spring seat used for limiting the small valve core and a return spring arranged between the small valve core and the spring seat are arranged in the second cylindrical hole; the outer surface of the regeneration valve rod is provided with a regeneration hole leading to the second cylindrical hole and a regeneration throttling hole leading to the fourth cylindrical hole. The invention realizes the regeneration function of the main valve, does not need to process two ends of the valve rod and does not have a slender through hole structure, the length of a regeneration oil path is shortened by about 2/3, the processing size of the regeneration valve rod is reduced by 1/2, and the number of assembling parts of the sheet valve assembly is reduced by 6.
Description
Technical Field
The invention belongs to the technical field of hydraulic devices, relates to a novel valve rod regeneration structure for a load sensitive valve, and particularly relates to a regeneration valve rod for recycling potential energy of an entire machine working device.
Background
Taking the descending process of the movable arm in the action of the whole excavator as an example, the hydraulic oil in the rodless cavity of the oil cylinder generates pressure in the descending process of the movable arm due to the dead weight of the movable arm and the load, and the traditional hydraulic control valve consumes the energy of the hydraulic oil in the high-pressure state of the rodless cavity of the oil cylinder through a throttling groove on a valve rod, so that the descending process of the movable arm is stable and controllable.
In addition, the main pump of the whole excavator works in a state with small discharge capacity in the three actions of the descending of the movable arm of the whole excavator, the closing of the bucket rod and the closing of the bucket, the output oil of the main pump is not enough to meet the action requirement of a working device, and in order to prevent the oil cylinder from sucking air, abnormal sound and the like to damage relevant parts of the whole excavator, the pressure oil recovered in the three actions of the whole excavator is led into the other cavity of the working oil cylinder through a regeneration oil path under hydraulic control, the energy can be accurately and reasonably reused.
The load sensitive control valve for the whole excavator is mostly of a plate valve structure, the internal oil circuit structure of each valve body is compact, and the regeneration circuit of the functions is difficult to realize on the plate valve body, so that the regeneration oil circuit for the existing load sensitive valve is basically realized on a valve rod, but the regeneration oil circuit of the existing valve rod is long in channel, large in pressure loss of the oil circuit, complex in regeneration structure, large in machining size, large in difficulty and high in cost.
In order to realize the oil circuit regeneration function of the main valve, shorten the channel length of the valve rod regeneration oil circuit, reduce the processing difficulty of the valve rod regeneration oil circuit, reduce the cost of hydraulic elements and the like, the regeneration valve rod for the existing load sensitive valve needs to be structurally improved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problems of long regenerated oil path channel, large pressure loss of an oil path and insufficient regenerated flow of a regenerated valve rod of the load sensitive control valve for the whole excavator are solved, and the problems of large machining size, large difficulty and high part cost of a sheet valve regeneration assembly of an existing valve rod regeneration structure are solved.
In order to achieve the aim, the technical scheme of the invention provides a novel valve rod regeneration structure for a load-sensitive valve, which comprises a regeneration valve rod, wherein an inner hole of the regeneration valve rod comprises a first cylindrical hole, a second cylindrical hole, a third cylindrical hole and a fourth cylindrical hole, wherein the first cylindrical hole, the second cylindrical hole, the third cylindrical hole and the fourth cylindrical hole are axially communicated with each other, and the diameters of the first cylindrical hole, the second cylindrical hole, the third cylindrical hole and the fourth cylindrical hole are sequentially reduced from large to small; a small valve core capable of sliding, a spring seat used for limiting the small valve core and a return spring arranged between the small valve core and the spring seat are arranged in the second cylindrical hole; and the outer surface of the regeneration valve rod is provided with a regeneration hole leading to the second cylindrical hole and a regeneration throttling hole leading to the fourth cylindrical hole.
Preferably, a plug for limiting the axial position of the spring seat in the regeneration valve rod is arranged on one side of the spring seat far away from the small valve core.
Preferably, a sealing groove is formed between the plug and the regeneration valve rod, and an O-shaped ring is arranged in the sealing groove.
Preferably, the regeneration orifice opens into an end of the fourth cylindrical bore remote from the third cylindrical bore.
Preferably, the plurality of regeneration orifices are arranged in sequence in the axial direction of the regeneration valve rod, and the axial arrangement distance is within 8 mm; the regeneration throttling holes in the same axial position on the regeneration valve rod are uniformly distributed in the radial direction of the regeneration valve rod.
Preferably, the second cylindrical hole of the regeneration valve rod is in clearance fit with the outer surface of the small valve core, and the small valve core is provided with a spherical surface which forms a linear seal with the opening of the third cylindrical hole of the regeneration valve rod.
Preferably, the regeneration holes are located between the regeneration valve rod and the small valve core wire sealing position and the clearance fit position, and the number of the regeneration holes is set to be 4 and is uniformly distributed in the radial direction of the valve rod.
Preferably, the front end of the small valve core is provided with a slender damping hole, and the ratio of the axial projection area of the clearance fit outer surface of the small valve core to the axial projection area of the sealing position of the core line of the small valve is 1.8-2.
Preferably, the outer surface of the regeneration valve rod is provided with outer circle throttling grooves, the outer circle throttling grooves are axially located in a spring cavity between the small valve core and the spring seat of the regeneration valve rod, and the outer circle throttling grooves are uniformly distributed in the radial direction of the regeneration valve rod.
In summary, the invention has the following beneficial technical effects:
the technical scheme of the invention is that a novel valve rod regeneration structure is adopted on the basis of not changing the existing sheet valve casting, the pressure loss of an oil path is reduced by shortening the length of a regeneration oil path, and the regeneration flow is improved; by reducing the number of relative machining sizes of the regenerated oil way and the number of relative assembly parts, the production efficiency is improved, and the cost is reduced.
According to the special structural design of the regeneration valve rod, a channel of a regeneration oil circuit of the valve rod can be completed only by processing one end of the valve rod, the regeneration function of a main valve is realized, processing at two ends of the valve rod is not needed, and a slender through hole structure (a structure before improvement) is not needed.
In addition, when the main valve is used in a regeneration function, the main pump only needs to output a part of pressure oil required by the action to complete the action of the corresponding working device of the whole machine, so that the energy conservation and emission reduction of the whole machine are realized, and the pressure oil required by the other action is replaced by the regeneration oil, so that the accurate and reasonable utilization of energy is achieved.
Drawings
FIG. 1 is a schematic diagram of a novel valve stem regeneration configuration for a load-sensitive valve;
FIG. 2 is a schematic diagram of the flow regeneration of a novel valve stem regeneration configuration for a load-sensitive valve.
Reference numerals are as follows: 1. a regeneration valve stem; 2. a small valve core; 3. a return spring; 4. a spring seat; 5. plugging by screwing; 6. an O-shaped ring; 7. a regenerative oil passage hole; 8. a regeneration pore; 9. a regeneration orifice; 10. an outer circle throttling groove; 11. an elongated orifice.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to fig. 1 and 2.
The invention relates to a novel valve rod regeneration structure for a load-sensitive valve, which has the advantages of short regeneration oil path channel, small oil path pressure loss, high processing efficiency of a regeneration valve rod 1 and low cost, and comprises the regeneration valve rod 1 in clearance fit with a main valve hole as shown in figure 1, so that the regeneration valve rod 1 can axially move in the main valve hole to complete a reversing function. A small valve core 2, a return spring 3, a spring seat 4, a plug 5 and an O-shaped ring 6 are arranged in the regeneration valve rod 1.
The plug 5 is arranged at the orifice of the regeneration valve rod 1 and is connected with the orifice through threads, and the plug 5 is in surface contact with the spring seat 4 to limit the axial position of the spring seat 4 on the regeneration valve rod 1; an O-shaped ring 6 is arranged in a sealing groove between the plug 5 and the regeneration valve rod 1 for sealing, so that leakage is prevented.
The spring seat 4 is arranged in an inner hole of the regeneration valve rod 1 and does not need precise matching, so that the axial position of internal parts of the regeneration valve rod 1 is ensured; one end face of the spring seat 4 is in surface contact with the bottom face of the plug 5, and the regeneration valve rod 1 is in clearance fit with the spring seat 4.
The front end sealing position of the small valve core 2 is set to be a spherical surface, a reset spring 3 is arranged between the spring seat 4 and the small valve core 2, the front end spherical surface of the small valve core 2 and the regeneration valve rod 1 form linear sealing when the main valve is in a middle position, and the leakage quantity when the small valve core 2 is closed is ensured; the front end of the spherical surface of the small valve core 2 is provided with a slender damping hole 11; the sealing position of the rear end of the small valve core 2 is a cylindrical surface and is matched with the inner hole clearance of the regeneration valve rod 1 to play a role in sealing and guiding, and the small valve core 2 and the regeneration valve rod 1 need to be precisely matched.
The regeneration oil path passage hole 7 only needs to be machined at one end of the regeneration valve rod 1, the regeneration valve rod 1 is provided with a regeneration throttling hole 9, the regeneration oil path passage hole 7, a regeneration hole 8 and an outer circle throttling groove 10, and the inner hole of the valve rod is finely machined and is centralized at the matching position with the small valve element 2. The outer circle throttling grooves 10 of the regeneration valve rod 1 are axially and uniformly distributed in the valve rod at a spring cavity between the small valve core 2 and the spring seat 4.
The regeneration orifice 9 of the regeneration valve rod 1 is communicated with the regeneration oil path channel hole 7, the regeneration orifice 9 is positioned at the bottom end of the regeneration oil path channel hole, the regeneration orifices 9 are sequentially arranged in the axial direction of the valve rod, and the axial arrangement distance is within 8 mm; the regeneration orifices 9 with the same axial position on the regeneration valve rod 1 are uniformly distributed in the radial direction of the valve rod.
The inner hole of the regeneration valve rod 1 comprises 4-step axial cylindrical holes with different sizes, the 4-step axial cylindrical holes are a first cylindrical hole, a second cylindrical hole, a third cylindrical hole and a fourth cylindrical hole from the inner hexagonal end face of the plug 5 to the regeneration orifice 9 of the regeneration valve rod 1 in sequence, and the diameters of the 4-step axial cylindrical holes are sequentially reduced from large to small; the orifice of the second cylindrical bore has a seal groove and the orifice of the third cylindrical bore has a conical seal surface.
4 regeneration holes 8 of the regeneration valve rod 1 are uniformly distributed in the radial direction of the valve rod and are positioned between the line sealing position of the regeneration valve rod 1 and the small valve element 2 and the matching position of the cylindrical surface and communicated with the second cylindrical hole.
The regeneration oil path passage hole 7 of the regeneration valve rod 1 is a fourth cylindrical hole, the regeneration throttling hole 9 of the regeneration valve rod 1 is communicated with the fourth cylindrical hole, and the fine machining size of the inner hole of the valve rod is concentrated on the bottom of the second cylindrical hole and the hole opening of the third cylindrical hole.
The second cylindrical hole of the regeneration valve rod 1 and the third cylindrical surface of the small valve core 2 are in precise fit to form clearance seal, the spherical surface of the small valve core 2 and the conical surface of the third cylindrical hole of the regeneration valve rod 1 form line seal, the axial projection area of the third cylindrical hole of the regeneration valve rod 1 is S1, the axial projection area of the third cylindrical hole on the outer surface of the small valve core 2 is S2, and the ratio of the projection area S2 to the projection area S1 is 1.8-2.
And a channel of a valve rod regeneration oil path is processed at one end of the valve rod to realize the regeneration function of the main valve, a regeneration orifice 9 is arranged on the outer circumference of the valve rod, and the regeneration flow is adjusted according to the stroke of the regeneration valve rod 1. The important processing dimension of the regeneration valve rod 1 is concentrated to the position matched with the small valve core 2, and the forming cutter is integrally processed, so that the processing efficiency and the processing quality are improved.
The outer surface of the small valve core 2 comprises 3-step cylindrical surfaces with different diameters and a spherical surface, the 3-step cylindrical surfaces are a first cylindrical surface, a second cylindrical surface and a third cylindrical surface respectively, the diameters of the 3-step cylindrical surfaces are sequentially increased from small to large, and the first cylindrical surface and the third cylindrical surface are respectively positioned at two ends.
One end of the first cylindrical surface is connected with one end of the spherical surface, and the other end of the spherical surface is connected with the second cylindrical surface; the second cylindrical surface is connected with the third cylindrical surface through a 30-degree chamfer; the third cylindrical surface is a guide surface and is precisely matched with a second cylindrical hole of the regeneration valve rod 1 to play a role in clearance sealing; the spherical surface of the small valve core 2 and the orifice conical surface of the third cylindrical hole of the regeneration valve rod 1 form a linear seal.
The inner surface of the small valve core 2 comprises 3 cylindrical surfaces with different diameters, the 3 cylindrical surfaces are a fourth cylindrical surface, a fifth cylindrical surface and a sixth cylindrical surface respectively, the diameters of the cylindrical surfaces are sequentially increased from small to large, the fourth cylindrical surface and the sixth cylindrical surface are respectively arranged at two ends, and the fourth cylindrical surface is a slender damping hole 11 of the small valve core 2.
The working process of the invention is as follows:
when the invention is used, the regeneration valve rod 1 is in clearance fit with a main valve hole, the regeneration valve rod 1 can move left and right in the valve hole and move right under the combined action of pilot pressure oil at the B end and a pilot return spring 3 at the A end, and the valve rod works in a state shown in figure 2;
the oil in the oil return cavity of the working device is in a high-pressure state due to the potential energy of the working device of the whole machine and the load, the oil pressure in the oil inlet cavity of the working device is lower, and the pressure oil in the oil return cavity of the working device acts on the small valve core 2, so that the small valve core 2 overcomes the pre-tightening force of the reset spring 3 and moves rightwards, and at the moment, the linear sealing position formed by the spherical surface at the front end of the small valve core 2 and the regeneration valve rod 1 is opened;
pressure oil of an oil return cavity of one part of the working device flows back to the oil tank through an excircle circumferential throttling groove of the regeneration valve rod 1, pressure oil of an oil return cavity of the other part of the working device flows to a regeneration throttling hole 9 of the valve rod through a linear sealing position formed by a spherical surface at the front end of the small valve core 2 and the regeneration valve rod 1 and a regeneration oil path channel hole 7 of the regeneration valve rod 1, and the pressure oil of the oil return cavity of the working device is shunted at the position;
according to the stroke of the valve rod, the regeneration orifices 9 at different positions of the regeneration valve rod 1 in the axial direction are opened, pressure oil in an oil return cavity of the working device is converged with output oil of the main pump after passing through the regeneration orifices 9, and the converged oil enters an oil inlet cavity of the working device through the check valve and the valve body oil passage to complete the oil regeneration function.
The main pump can complete the action of the corresponding working device of the whole machine only by outputting a part of pressure oil liquid required by the action, so that the energy conservation and emission reduction of the whole machine are realized, and the other part of pressure oil liquid required by the action is replaced by the regeneration oil liquid, thereby achieving the purpose of accurate and reasonable utilization of energy.
The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present invention.
Claims (10)
1. The utility model provides a load is novel valve rod regeneration structure for sensitive valve which characterized in that: the regeneration valve rod comprises a regeneration valve rod (1), wherein an inner hole of the regeneration valve rod (1) comprises a first cylindrical hole, a second cylindrical hole, a third cylindrical hole and a fourth cylindrical hole which are axially communicated with each other and have diameters which sequentially decrease from large to small; a small valve core (2) capable of sliding, a spring seat (4) used for limiting the small valve core (2) and a return spring (3) arranged between the small valve core (2) and the spring seat (4) are arranged in the second cylindrical hole; and a regeneration hole (8) leading to the second cylindrical hole and a regeneration throttling hole (9) leading to the fourth cylindrical hole are formed in the outer surface of the regeneration valve rod (1).
2. The novel valve stem regeneration structure for a load sensing valve as defined in claim 1, wherein: and a plug (5) used for limiting the axial position of the spring seat (4) in the regeneration valve rod (1) is arranged on one side, away from the small valve core (2), of the spring seat (4).
3. The novel valve stem regeneration structure for a load sensing valve as defined in claim 2, wherein: a sealing groove is arranged between the plug (5) and the regeneration valve rod (1), and an O-shaped ring (6) is arranged in the sealing groove.
4. The novel valve stem regeneration structure for a load sensing valve as defined in claim 1, wherein: the regeneration orifice (9) opens into the end of the fourth cylindrical bore remote from the third cylindrical bore.
5. The novel valve stem regeneration structure for a load sensing valve as defined in claim 4, wherein: the plurality of regeneration orifices (9) are arranged in sequence in the axial direction of the regeneration valve rod (1), and the axial arrangement distance is within 8 mm; the regeneration orifices (9) on the regeneration valve rod (1) at the same axial position are uniformly distributed in the radial direction of the regeneration valve rod (1).
6. The novel valve stem regeneration structure for a load sensing valve as defined in claim 1, wherein: the second cylindrical hole of the regeneration valve rod (1) is in clearance fit with the outer surface of the small valve core (2), and the small valve core (2) is provided with a spherical surface which forms linear sealing with the opening of the third cylindrical hole of the regeneration valve rod (1).
7. The novel valve stem regeneration structure for a load sensing valve as defined in claim 6, wherein: the regeneration holes (8) are located between the regeneration valve rod (1) and the small valve core (2) at the line sealing position and the clearance fit position, and the regeneration holes (8) are arranged in a plurality and are uniformly distributed in the radial direction of the valve rod.
8. The novel valve stem regeneration structure for a load sensing valve as defined in claim 7, wherein: the front end of the small valve core (2) is provided with a slender damping hole (11).
9. The novel valve stem regeneration structure for a load sensing valve as defined in claim 1, wherein: the outer surface of the regeneration valve rod (1) is provided with an outer circle throttling groove (10), the outer circle throttling groove (10) is located in a spring cavity between the small valve core (2) and the spring seat (4) in the axial direction of the regeneration valve rod (1), and the outer circle throttling groove and the spring cavity are uniformly distributed in the radial direction of the regeneration valve rod (1).
10. The novel valve stem regeneration structure for a load sensing valve as defined in claim 1, wherein: the ratio of the axial projection area of the end part of the small valve core (2) to the axial projection area of the third cylindrical hole of the regeneration valve rod (1) is 1.8-2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210677755.XA CN115012470A (en) | 2022-06-16 | 2022-06-16 | Novel valve rod regeneration structure for load sensitive valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210677755.XA CN115012470A (en) | 2022-06-16 | 2022-06-16 | Novel valve rod regeneration structure for load sensitive valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115012470A true CN115012470A (en) | 2022-09-06 |
Family
ID=83075729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210677755.XA Pending CN115012470A (en) | 2022-06-16 | 2022-06-16 | Novel valve rod regeneration structure for load sensitive valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115012470A (en) |
-
2022
- 2022-06-16 CN CN202210677755.XA patent/CN115012470A/en active Pending
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