CN201575000U - Stroke limit unloading valve for oil cylinder pistons - Google Patents
Stroke limit unloading valve for oil cylinder pistons Download PDFInfo
- Publication number
- CN201575000U CN201575000U CN2009202576960U CN200920257696U CN201575000U CN 201575000 U CN201575000 U CN 201575000U CN 2009202576960 U CN2009202576960 U CN 2009202576960U CN 200920257696 U CN200920257696 U CN 200920257696U CN 201575000 U CN201575000 U CN 201575000U
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Abstract
The utility model discloses a stroke limit unloading valve for oil cylinder pistons. The valve comprises a cylinder body and a cylinder cover arranged on the cylinder body, wherein oil ports are arranged on the cylinder body, a piston is mounted inside the cylinder body, seal rings are arranged between the piston and the inner wall of the cylinder body, a piston shaft on the piston is positioned outside the cylinder cover after penetrating the cylinder cover, a vertical through hole with a large-aperture end and a small-aperture end is formed on the piston, an upper valve body and a lower valve body are mounted in the through hole, a spring is arranged between the upper and the lower valve bodies, a valve seat is arranged at the mouth of the large-aperture end of the through hole, and the upper valve body is placed in the middle of the valve seat. When the piston moves, the upper and the lower valve bodies placed in the through hole on the piston open one end of the through hole and seal the other end under the oil pressure; and when the piston moves to a certain position, the sealed end is propped against the cylinder body and opened, so as to balance the oil pressure at the two ends of the piston. The utility model adopting the structure can reduce the abrasion of the piston during the reciprocating movements thereof, and has the characteristics of simple manufacturing, convenience use, low cost, etc.
Description
Technical field
The utility model relates to a kind of oil cylinder piston stroke limit unloading valve.
Background technique
The application of machine industry hydraulics is hustling and bustling just at present, originally utilized the more insoluble problem of mechanical ratio to utilize hydraulics all to obtain more satisfactory effect and make simple, yet also having some a fly in the ointment, is exactly the thing of comparison headache as the stroke limit problem of oil hydraulic cylinder.Conventional way is utilized lead limit switch control exactly, but there is great potential safety hazard in this controlling method, when electrical equipment control breaks down or position limit switch when breaking down, thereby the axle plug of hydraulic jack flexible will out of handly make the pressure mass action of system cause to oil cylinder cover that an ancient egg-shaped, holed wind instrument of oil cylinder cover is bad or deviate to make the equipment can't proper functioning, and perhaps stroke grinds problems such as an ancient egg-shaped, holed wind instrument to spacing not off-load of solstice equipment work system temperature rising service behaviour under high pressure conditions acceleration parts that descend.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, provide a kind of can the control piston stroke, make the oil pressure at piston two ends reach balance, reduce the oil cylinder piston stroke limit unloading valve of wearing for piston.
The purpose of this utility model is achieved through the following technical solutions:
A kind of oil cylinder piston stroke limit unloading valve, include cylinder body and the cylinder cap that is arranged on the cylinder body, cylinder body is provided with hydraulic fluid port, be provided with piston in the cylinder body, be provided with seal ring between piston and the inboard wall of cylinder block, piston shaft on the piston passes cylinder cap and places outside the cylinder cap, described piston is provided with the through hole that runs through up and down, and through hole one end is the large aperture, the other end is the small aperture, is provided with upper valve body and following valve body in the through hole, is provided with spring between upper valve body and the following valve body, be positioned at the port, large aperture and be provided with valve seat, upper valve body places in the middle of the valve seat.
Described upper valve body and following valve body are made of valve rod and valve head, and the shape of the shape of described upper valve body valve head and valve seat the inner is complementary, and the interior shape that becomes reducing place, small aperture by the large aperture of the shape of described time valve body valve head and through hole is complementary; The valve rod of described upper valve body and following valve body places the outside of through hole respectively.
Described valve head be shaped as taper shape.
The shape of described valve head is the shape disc.
Be provided with oil duct in the valve rod of described upper valve body and following valve body, valve rod be provided with two with identical oilhole.
The utility model has the advantages that: because unloading valve has been installed on piston, during piston motion, place on the piston in the through hole upper valve body and following valve body under the effect of oil pressure, an end to be opened, the other end then seals, during the certain position of piston motion, sealing an end withstands cylinder body and opens, this moment, the oil pressure at piston two ends reached balance, piston can reduce in the to-and-fro motion process wearing for piston thus, and have and make simply, easy to use, characteristics such as expense is cheap are that hydraulic equipment is manufactured indispensable mechanism.
Description of drawings
Fig. 1 is embodiment 1 a structural representation;
Fig. 2 is the structural representation of embodiment's 1 descent of piston action;
Fig. 3 is the structural representation of embodiment's 1 piston stroking upward action;
Fig. 4 is embodiment 2 a valve body structure schematic representation;
Fig. 5 is embodiment 3 a valve body structure schematic representation.
Embodiment
Embodiment 1: oil cylinder piston stroke limit unloading valve as shown in Figure 1, include cylinder body 13 and the cylinder cap 10 that is arranged on the cylinder body 13, cylinder body 15 is provided with hydraulic fluid port 12,12`, be provided with piston 15 in the cylinder body 13, be provided with seal ring 14 between piston 15 and cylinder body 13 inwalls, the piston shaft 11 on the piston 15 passes cylinder cap 10 and places cylinder cap 10 outsides.Described piston 15 is provided with the through hole 6 that runs through up and down, and through hole 6 one ends are the large aperture, and the other end is the small aperture, is provided with upper valve body 2 and following valve body 8 in the through hole 6, is provided with spring 5 between upper valve body 2 and the following valve body 8.The wide-aperture port that is positioned at through hole 6 is provided with valve seat 3.
Described upper valve body 2 is made of valve rod 1 and valve head 4, following valve body 8 is made of valve rod 9 and valve head 7, the shape of the shape of described upper valve body 2 valve heads 4 and valve seat 3 connecting part end faces is complementary, and the interior shape that becomes reducing place, small aperture by the large aperture of the shape of described down valve body 8 valve heads 7 and through hole is complementary.The shape of described valve head 4,7 is taper shape.The end of the valve rod 1,9 of described upper valve body 2 and following valve body 8 places the outside of through hole 6 respectively.
Working principle: when descent of piston, as shown in Figure 2, high pressure oil is entered by hydraulic fluid port 12, piston 15 upper surfaces move down piston 15 under the oil pressure effect, move down under the effect of upper valve body 2 oil pressure and open filler opening, because of leaving certain interval between the valve rod 1 of upper valve body 2 and the valve seat 3, this gap can enter in the through hole 6 by oil, and valve body 8 moves down under the effect of spring 5 at present together, with the bottom sealing of through hole 6.When piston 15 moves to lower limit, lower valve rod 8 limited can't moving and opening, thereby make piston about in the of 15 two-part oil circuit communicate and reach off-load.Shown in Figure 3, when piston 15 is up, piston 15 lower surfaces have the effect that is subjected to oil pressure, piston 15 moves up, valve body 8 is opened under the oil pressure effect, and upper valve body 2 is closed, when moving to upper limit, upper valve body 2 limited can't moving and opening, thus this moment piston about in the of 15 two-part oil circuit communicate and reach off-load.Piston 15 off-loads can reach the effect of protective system.
Embodiment 2: the upper valve body that shown in Figure 4 is among the embodiment 1 and another structural type of following valve body, be provided with oil duct in the valve rod 1 of this valve body 2, and valve rod 1 is provided with two oilhole 16, the 16`s identical with oil duct 17.
Embodiment 3: as shown in Figure 5, structure of this enforcement and embodiment's 2 structure is basic identical, and its difference is the disc that is shaped as of described valve head 4, and the end face of the valve seat 3 that is complementary with it is the plane; Become the plane that is shaped as at reducing place, small aperture in the through hole 6 on the piston 15 by the large aperture.
Claims (5)
1. oil cylinder piston stroke limit unloading valve, include cylinder body and the cylinder cap that is arranged on the cylinder body, cylinder body is provided with hydraulic fluid port, be provided with piston in the cylinder body, be provided with seal ring between piston and the inboard wall of cylinder block, piston shaft on the piston passes cylinder cap and places the cylinder cap outside, it is characterized in that: described piston is provided with the through hole that runs through up and down, and through hole one end is the large aperture, the other end is the small aperture, is provided with upper valve body and following valve body in the through hole, is provided with spring between upper valve body and the following valve body, be positioned at the port, large aperture and be provided with valve seat, upper valve body places in the middle of the valve seat.
2. oil cylinder piston stroke limit unloading valve according to claim 1, it is characterized in that: described upper valve body and following valve body are made of valve rod and valve head, the shape of the shape of described upper valve body valve head and valve seat connecting part end face is complementary, and the interior shape that becomes reducing place, small aperture by the large aperture of the shape of described down valve body valve head and through hole is complementary; The end of the valve rod of described upper valve body and following valve body places the outside of through hole respectively.
3. oil cylinder piston stroke limit unloading valve according to claim 2 is characterized in that: described valve head be shaped as taper shape.
4. oil cylinder piston stroke limit unloading valve according to claim 2 is characterized in that: the shape of described valve head is the shape disc.
5. according to claim 2 or 3 or 4 described oil cylinder piston stroke limit unloading valves, it is characterized in that: be provided with oil duct in the valve rod of described upper valve body and following valve body, valve rod is provided with two oilholes identical with oil duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202576960U CN201575000U (en) | 2009-10-29 | 2009-10-29 | Stroke limit unloading valve for oil cylinder pistons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202576960U CN201575000U (en) | 2009-10-29 | 2009-10-29 | Stroke limit unloading valve for oil cylinder pistons |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201575000U true CN201575000U (en) | 2010-09-08 |
Family
ID=42694875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202576960U Expired - Fee Related CN201575000U (en) | 2009-10-29 | 2009-10-29 | Stroke limit unloading valve for oil cylinder pistons |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201575000U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588384A (en) * | 2012-03-08 | 2012-07-18 | 柳州双吉机械有限公司 | Single-acting hydrocylinder piston unloading device |
| CN103967863A (en) * | 2014-05-09 | 2014-08-06 | 中科华核电技术研究院有限公司 | Hydraulic cylinder for lifting |
| CN104314919A (en) * | 2014-09-01 | 2015-01-28 | 富阳通力机械制造有限公司 | Limit valve capable of controlling jack stroke |
| CN106194884A (en) * | 2016-08-26 | 2016-12-07 | 汽解放柳州特种汽车有限公司 | It is a kind of without internal leakage is pushed up Tipper Lifting oil cylinder |
-
2009
- 2009-10-29 CN CN2009202576960U patent/CN201575000U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588384A (en) * | 2012-03-08 | 2012-07-18 | 柳州双吉机械有限公司 | Single-acting hydrocylinder piston unloading device |
| CN103967863A (en) * | 2014-05-09 | 2014-08-06 | 中科华核电技术研究院有限公司 | Hydraulic cylinder for lifting |
| CN104314919A (en) * | 2014-09-01 | 2015-01-28 | 富阳通力机械制造有限公司 | Limit valve capable of controlling jack stroke |
| CN106194884A (en) * | 2016-08-26 | 2016-12-07 | 汽解放柳州特种汽车有限公司 | It is a kind of without internal leakage is pushed up Tipper Lifting oil cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100908 Termination date: 20131029 |