CN102705296A - Piston rod of hydraulic cylinder - Google Patents
Piston rod of hydraulic cylinder Download PDFInfo
- Publication number
- CN102705296A CN102705296A CN201210205042XA CN201210205042A CN102705296A CN 102705296 A CN102705296 A CN 102705296A CN 201210205042X A CN201210205042X A CN 201210205042XA CN 201210205042 A CN201210205042 A CN 201210205042A CN 102705296 A CN102705296 A CN 102705296A
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- Prior art keywords
- piston rod
- piston
- unloading hole
- hydraulic cylinder
- rod
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Abstract
The invention discloses a piston rod of a hydraulic cylinder, and is characterized in that an unloading hole is arranged on an axis direction of a tail end face of the piston rod, the unloading hole penetrates through two end faces of a piston, and is 2/3 smaller than a total length of the piston rod. The piston rod has rupture phenomenon in production practice so as to cause property loss and personal safety accidents. The reasons are as follows: the piston is connected with the piston rod through a screw thread, the screw thread processing has vices, or the piston and the piston rod are welded, but the welding quality is low and the stress is centralized. According to the technical scheme, the unloading hole is arranged on the piston rod, when the piston rod is broken, oil enters into the cavity on the other side of the piston from the unloading hole, so that the pressures of the cavities on the both sides of the piston of the hydraulic cylinder are equal, and the piston rod stops acting, thus the property loss and the personal safety accidents can be avoided.
Description
Technical field
The present invention relates to a kind of hydraulic cylinder piston rod.
Background technique
No. 200420029583.2, China's utility model patent discloses a kind of anti-disconnected anticreep piston rod.Its piston and piston rod matching part and piston rod are isometrical, have removed tool withdrawal groove, have eliminated stress and have concentrated, thereby reached the purpose of avoiding rod fracture.Except stress is concentrated, cause the reason of rod fracture to also have: the screw thread processing that connects piston and piston rod exists adopts welding between defective, piston and the piston rod, welding quality is defective; The piston rod material is not up to standard; During hydraulic cylinder works, the instantaneous oil pressure increase of oil circuit etc. all can cause rod fracture.The problem that exists in the existing technology is, behind the rod fracture, there is pressure difference equally in piston both sides cavity in the oil hydraulic cylinder, and oil pressure still can the piston rod action, thereby causes any property loss, even the personal security accident possibly take place.
Summary of the invention
The technical problem that the present invention will solve is: behind the rod fracture, there is pressure difference in piston both sides cavity in the oil hydraulic cylinder, and piston rod still can move.
In order to solve the problems of the technologies described above, the invention provides following technological scheme:
A kind of hydraulic cylinder piston rod has a unloading hole at said piston rod bar breech face, and the aperture of unloading hole is less than three millimeters, and unloading hole connects side face of piston ring along axial direction, and the degree of depth of unloading hole is less than 2/3rds of the piston rod length overall.
Further, the degree of depth of said unloading hole equals 1/2nd of piston rod length overall.
The beneficial effect that the present invention obtained is: behind the rod fracture, the oil circuit oil pressure of piston both sides equates that very soon piston rod no longer moves, and has avoided the expansion of loss.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 structural representation of the present invention;
Fig. 2 unloading hole degree of depth is the structural representation of piston rod length overall 1/2nd.
Reference character: 1-piston rod; The 2-piston; The 3-unloading hole.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
Embodiment 1
As shown in Figure 1, piston 2 is enclosed within on the piston rod 1, has a unloading hole 3 at piston rod 1 bar breech face.The degree of depth of unloading hole 3 reaches the distal face of piston 2 at this moment.Two end faces of piston are the places that piston rod 1 fracture takes place the most easily, and stress is concentrated here, and therefore, guarantee has unloading hole 3 to pass between 2 two end faces of piston.Unloading hole 3 apertures are too big, can make piston rod 1 be easy to fracture, and therefore, unloading hole 3 apertures are less than three millimeters.Among Fig. 1, the proximal end face of piston 2 and piston rod 1 bar breech face are positioned at same plane, and the bar tail of going back some piston rod in the production stretches into feed liquor cylinder pressure base, and unloading hole 3 is corresponding darker.
Shown in Fig. 2, unloading hole 3 reaches 1/2nd of piston rod 1 length overall.This is because the fracture of piston rod 1 has multiple factor to cause, except with piston 2 cooperation places, piston rod 1 shaft also can rupture.In addition, if piston rod 1 ruptures in that hydraulic cylinder cavity is external, unloading hole 3 also can well play effect, in time reduces oil pressure, makes piston rod 1 stop action.
Technological scheme of the present invention is not limited to hydraulic cylinder piston rod, and cylinder piston rod is suitable equally.
What should explain at last is: the above is merely the preferred embodiments of the present invention; Be not limited to the present invention; Although the present invention has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technological scheme that aforementioned each embodiment put down in writing, and perhaps part technical characteristics wherein is equal to replacement.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. hydraulic cylinder piston rod, it is characterized in that: have a unloading hole at said piston rod bar breech face, the aperture of unloading hole is less than three millimeters, and unloading hole connects side face of piston ring along axial direction, and the degree of depth of unloading hole is less than 2/3rds of the piston rod length overall.
2. a kind of hydraulic cylinder piston rod according to claim 1 is characterized in that: the degree of depth of said unloading hole equals 1/2nd of piston rod length overall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210205042XA CN102705296A (en) | 2012-06-20 | 2012-06-20 | Piston rod of hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210205042XA CN102705296A (en) | 2012-06-20 | 2012-06-20 | Piston rod of hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102705296A true CN102705296A (en) | 2012-10-03 |
Family
ID=46898288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210205042XA Pending CN102705296A (en) | 2012-06-20 | 2012-06-20 | Piston rod of hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102705296A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1313634A (en) * | 1972-01-21 | 1973-04-18 | Bishop Ltd H H | Sleeved metal articles |
| DE3215795A1 (en) * | 1982-04-28 | 1983-11-17 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | High-speed cylinder |
| CN2615406Y (en) * | 2003-04-29 | 2004-05-12 | 天津特***压股份有限公司 | Piston type single-action damper hydraulic cylinder |
| CN201074618Y (en) * | 2007-08-20 | 2008-06-18 | 山东公路机械厂 | Work oil cylinder of crusher |
| CN202612268U (en) * | 2012-06-20 | 2012-12-19 | 无锡天惠塑机有限公司 | Piston rod of hydraulic cylinder |
-
2012
- 2012-06-20 CN CN201210205042XA patent/CN102705296A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1313634A (en) * | 1972-01-21 | 1973-04-18 | Bishop Ltd H H | Sleeved metal articles |
| DE3215795A1 (en) * | 1982-04-28 | 1983-11-17 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | High-speed cylinder |
| CN2615406Y (en) * | 2003-04-29 | 2004-05-12 | 天津特***压股份有限公司 | Piston type single-action damper hydraulic cylinder |
| CN201074618Y (en) * | 2007-08-20 | 2008-06-18 | 山东公路机械厂 | Work oil cylinder of crusher |
| CN202612268U (en) * | 2012-06-20 | 2012-12-19 | 无锡天惠塑机有限公司 | Piston rod of hydraulic cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121003 |