CN202789815U - Cylinder bottom oil way cutting-off valve - Google Patents
Cylinder bottom oil way cutting-off valve Download PDFInfo
- Publication number
- CN202789815U CN202789815U CN 201220519860 CN201220519860U CN202789815U CN 202789815 U CN202789815 U CN 202789815U CN 201220519860 CN201220519860 CN 201220519860 CN 201220519860 U CN201220519860 U CN 201220519860U CN 202789815 U CN202789815 U CN 202789815U
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- China
- Prior art keywords
- oil
- pipe joint
- valve body
- cylinder bottom
- blind hole
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a cylinder bottom oil way cutting-off valve. The valve comprises a cylinder bottom of a hydraulic oil cylinder; an oil way is arranged on the bottom of the cylinder; a pipe joint is in threaded connection at an outlet end of the oil way; a valve body is sleeved in an inner end of the pipe joint with gaps; a spring is arranged between the pipe joint and the valve body; the valve body is provided with a blind hole and a radial oil through hole; the radial oil through hole is communicated with the blind hole; a stop ring radially extends outwards from a closed end of the blind hole in the valve body; a seal ring is arranged on one side (facing to the pipe joint) of the stop ring; and a location rod with the diameter far smaller than the diameter of the stop ring is arranged on one side of the closed end (far from the pipe joint) of the blind hole of the valve body. The cylinder bottom oil way cutting-off valve has the advantages of being simple structure, convenient to manufacture, low in cost, good in sealing effect, and low in noise and the cutting-off of the oil way can be fast and reliably realized.
Description
Technical field
The utility model relates to a kind of hydraulic cutting valve, and more particularly, the utility model relates to a kind of cylinder bottom oil-way shutoff valve for fork truck.
Background technique
The cylinder bottom oil-way shutoff valve of existing fork truck causes the fluid in the oil circuit to flow not smooth owing to guiding valve, spring move about in oil circuit, fluid flows and has certain pulsating nature, increased the noise of fork truck, and need groove processing at the cylinder bottom oil duct, sealing surface in the oil duct needs fine finishing, causes the manufacture cost of cylinder bottom oil-way shutoff valve higher.The problem that exists for solving existing fork truck, State Patent Office is in disclosed CN201382035Y patent on January 13rd, 2010, the name of this patent is called " cylinder bottom oil-way shutoff valve ", the described a kind of cylinder bottom oil-way shutoff valve of this patent, that cylinder bottom at hydraulic jack is provided with oil duct, outlet end at oil duct is bolted with pipe joint, be provided with valve body in the pipe joint, be provided with spring between pipe joint and the valve body, be provided with seal ring between cylinder bottom and the pipe joint, affiliated valve body comprises spool and valve rod, be provided with blind hole at valve rod and reach the oil through radially that communicates with blind hole, valve rod is connected on the pipe joint in the cylinder bottom by bearing pin, and the pin shaft hole of the axial bar shaped that arranges at valve rod can make valve body move along bearing pin to the pipe joint direction and Compress Spring cooperates with pipe joint to spool and closes oil duct.Although the described cylinder bottom oil-way shutoff valve of this patent has solved the problem that needs to process groove on the cylinder bottom oil duct, the sealing surface between oil duct and the valve body still needs highi degree of accuracy processing, and processing cost is higher; In addition, the sidewall of valve body blind hole is thinner, opens the bar shaped pin shaft hole at the sealing surface of blind hole sidewall, may make valve body deformation on the one hand, can destroy on the other hand the fine finishing precision of sealing surface, and these two aspects all can make its sealing effect to fluid have a greatly reduced quality.
Summary of the invention
For overcoming defects, it is a kind of simple in structure, easily manufactured, with low cost that the utility model provides, and good sealing effect, and oil circuit cuts off fast, reliable cylinder bottom oil-way shutoff valve.
For reaching described purpose, technical solution adopted in the utility model is: a kind of cylinder bottom oil-way shutoff valve, the cylinder bottom that comprises hydraulic jack, cylinder bottom is provided with oil duct, outlet end at oil duct is bolted with pipe joint, be socketed with valve body pipe joint inner end internal clearance, be provided with spring between pipe joint and the valve body, the radially oil through that described valve body is provided with blind hole and communicates with blind hole, described valve body is at the blind hole closed end back-up ring that extends radially outwardly out, back-up ring is provided with seal ring towards a side of pipe joint, and valve body is provided with diameter much smaller than the positioning rod of back-up ring diameter at the blind hole closed end away from a side of pipe joint.When having certain pressure reduction inside and outside the valve body, oil circuit between valve body and the pipe joint relies on mutually effectively blocking-up of crush seal circle realization between back-up ring and the pipe joint, so that need not the highi degree of accuracy matching trim that is provided for sealing between valve body and the pipe joint, can simplify manufacturing procedure like this, reduce machining accuracy, reduce manufacture cost, increase the reliability of sealing.Owing to extend back-up ring on the valve body, so that bearing the contrast area difference of inside and outside differential pressure, valve body widens, the oil liquid pressure that valve body is subject to when oil circuit is damaged is poor also larger, thereby shortens the time of closing oil circuit, reaches the purpose of more fast, reliably cutting off oil circuit.
As optimized technological scheme, described pipe joint is provided with step hole in the inner end, and described spring is positioned at step hole, and an end of spring is connected on the inner bottom surface of step hole, and the other end of spring is connected on the end face of valve body blind hole opening end.Convenient for assembly.
As optimized technological scheme, the end face of described valve body blind hole opening end to the distance between the positioning rod exterior edge face stretches into the inserting end end face of cylinder bottom to the distance of oil duct inner bottom surface greater than pipe joint.Need not like this to arrange bearing pin and bar shaped pin shaft hole structure, just can guarantee valve body can not break away under any state and pipe joint between socket, thereby simplified structure and manufacturing procedure cut down finished cost.
As optimized technological scheme, the free length of described spring is less than the degree of depth of step hole; The free length of spring is greater than the ultimate range of both ends of the spring bearing surface, and what the ultimate range of both ends of the spring bearing surface was the step hole inner bottom surface to the end face of the distance of oil duct inner bottom surface and valve body blind hole opening end to the distance between the positioning rod exterior edge face is poor.Because the free length of spring is less than the degree of depth of step hole, like this when the assembling cylinder bottom oil-way shutoff valve, need not worry that valve body can break away from and pipe joint between socket, ease of assembly.Because the free length of spring is greater than the ultimate range of both ends of the spring bearing surface, what the ultimate range of both ends of the spring bearing surface was the step hole inner bottom surface to the end face of the distance of oil duct inner bottom surface and valve body blind hole opening end to the distance between the positioning rod exterior edge face is poor, like this so that the exterior edge face of valve body its positioning rod when oil circuit works contact with the cylinder bottom bottom surface all the time, guarantee that oil through is positioned at the position that fluid can be unimpeded, for the smooth working of fork truck provides reliable assurance.
As optimized technological scheme, the center line of described oil through is to the radius sum of the distance of back-up ring between a side of pipe joint more than or equal to diameter and the oil through of seal ring; The center line of oil through to the distance of oil duct inner bottom surface is less than or equal to poor to the distance of oil duct inner bottom surface and oil through radius of inserting end end face that pipe joint stretches into cylinder bottom.Because the center line of oil through, can guarantee like this setting of seal ring to the radius sum of the distance of back-up ring between a side of pipe joint more than or equal to diameter and the oil through of seal ring and can not have a negative impact to the fluid in the oil through is mobile; Because the center line of oil through to the distance of oil duct inner bottom surface is less than or equal to poor to the distance of oil duct inner bottom surface and oil through radius of inserting end end face that pipe joint stretches into cylinder bottom, can guarantee like this that pipe joint can not flow to the fluid in the oil through have a negative impact.
The beneficial effects of the utility model are: 1, owing to use the seal ring sealing between valve body and the pipe joint, save the sealing surface highi degree of accuracy processing for sealing, and simplified structure and manufacturing procedure, easily manufactured, reduce manufacture cost, increase the reliability of sealing; 2, owing to extend back-up ring on the valve body, so that the oil liquid pressure that valve body is subject to is poor larger, close oil circuit fast, reliably when oil circuit is damaged; 3, because valve body is provided with diameter much smaller than the positioning rod of back-up ring diameter at the blind hole closed end away from a side of pipe joint, positioning rod is under the pretightening force effect of spring, the exterior edge face of positioning rod contacts with the cylinder bottom bottom surface all the time, fundamentally eliminated the pulsating nature that fluid flows, the noise when having reduced cylinder bottom work.
Description of drawings
Fig. 1 is a kind of structure cross-sectional schematic of the utility model.
Among the figure: 1: cylinder bottom, 11: oil duct, 12: oil duct inner bottom surface, 2: spring, 3: oil seal washer, 4: pipe joint, 5: valve body, 51: blind hole, 52: positioning rod, 53: back-up ring, 54: oil through, 6: seal ring.
Embodiment
Below by specific embodiment, and in conjunction with Figure of description the technical solution of the utility model is further described in detail:
Embodiment: a kind of cylinder bottom oil-way shutoff valve as shown in Figure 1, the cylinder bottom 1 that comprises hydraulic jack, be provided with oil duct 11 on the cylinder bottom 1, be spirally connected at the outlet end of oil duct 11 and be connected with pipe joint 4, seal by oil seal washer 3 between cylinder bottom 1 and the pipe joint 4, center, pipe joint 4 inner end is provided with step hole, step hole is socketed with valve body 5 towards a splaying of oil duct inner bottom surface 12, valve body 5 is provided with blind hole 51 at the end center away from oil duct inner bottom surface 12, valve body 5 is provided with spring 2 between blind hole 51 opening ends and step hole inner bottom surface, one end of spring 2 is connected on the inner bottom surface of step hole, and the other end of spring 2 is connected on the end face of valve body 5 blind holes 51 opening ends.Valve body 5 is at the blind hole 51 closed ends back-up ring 53 that extends radially outwardly out, back-up ring 53 is provided with seal ring 6 towards a side of pipe joint 4, seal ring 6 is connected on the back-up ring 53, valve body 5 is being provided with four along valve body 5 circumferential radially oil throughs 54 uniform and that communicate with blind hole 51 near the position of seal ring 6, valve body 5 blind hole 51 closed ends away from a side of pipe joint 4 in mind-set oil duct inner bottom surface 12 directions extend diameter much smaller than the positioning rod 52 of back-up ring 53 diameters.The end face of valve body 5 blind holes 51 opening ends to the distance between positioning rod 52 exterior edge faces stretches into the inserting end end face of cylinder bottom 1 to the distance of oil duct inner bottom surface 12 greater than pipe joint 4.The free length of described spring 2 is less than the degree of depth of step hole; The free length of spring 2 is greater than the ultimate range of spring 2 two ends bearing surfaces, and what the ultimate range of spring 2 two ends bearing surfaces was the step hole inner bottom surface to the end face of the distance of oil duct inner bottom surface 12 and valve body 5 blind holes 51 opening ends to the distance between positioning rod 52 exterior edge faces is poor.The center line of described oil through 54 is to the radius sum of the distance of back-up ring 53 between a side of pipe joint 4 more than or equal to diameter and the oil through 54 of seal ring 6; The center line of oil through 54 to the distance of oil duct inner bottom surface 12 is less than or equal to poor to the distance of oil duct inner bottom surface 12 and oil through 54 radiuses of inserting end end face that pipe joint 4 stretches into cylinder bottom 1.
The working principle of cylinder bottom oil-way shutoff valve: when the fork truck oil pipe burst, fluid in the pipe joint 4 is decompression immediately, pressure reduction appears rapidly in two ends, valve body 5 left and right sides, the pressure reduction of oil pressure makes valve body 5 Compress Springs 2, and move to pipe joint 4 directions, when pipe joint 4 inner end end faces are pressed on the seal ring 6 tightly, seal ring 6 has just been blocked the passage between oil duct 11 and the pipe joint 4, make the oil cylinder of forklift door frame system obtain effective pressurize, can fast-descending and cause security incident, guarantee the safe handling of fork truck.
Above-described embodiment is a kind of preferred version of the present utility model, is not the utility model is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technological scheme that claim puts down in writing.
The content that is not described in detail in this specification belongs to the known prior art of those skilled in the art.
Claims (5)
1. cylinder bottom oil-way shutoff valve, the cylinder bottom that comprises hydraulic jack, cylinder bottom is provided with oil duct, outlet end at oil duct is bolted with pipe joint, be socketed with valve body pipe joint inner end internal clearance, be provided with spring between pipe joint and the valve body, the radially oil through that described valve body is provided with blind hole and communicates with blind hole, it is characterized in that: described valve body is at the blind hole closed end back-up ring that extends radially outwardly out, back-up ring is provided with seal ring towards a side of pipe joint, and valve body is provided with diameter much smaller than the positioning rod of back-up ring diameter at the blind hole closed end away from a side of pipe joint.
2. cylinder bottom oil-way shutoff valve according to claim 1, it is characterized in that: described pipe joint is provided with step hole in the inner end, described spring is positioned at step hole, and an end of spring is connected on the inner bottom surface of step hole, and the other end of spring is connected on the end face of valve body blind hole opening end.
3. cylinder bottom oil-way shutoff valve according to claim 1 and 2, it is characterized in that: the end face of described valve body blind hole opening end to the distance between the positioning rod exterior edge face stretches into the inserting end end face of cylinder bottom to the distance of oil duct inner bottom surface greater than pipe joint.
4. cylinder bottom oil-way shutoff valve according to claim 3, it is characterized in that: the free length of described spring is less than the degree of depth of step hole; The free length of spring is greater than the ultimate range of both ends of the spring bearing surface, and what the ultimate range of both ends of the spring bearing surface was the step hole inner bottom surface to the end face of the distance of oil duct inner bottom surface and valve body blind hole opening end to the distance between the positioning rod exterior edge face is poor.
5. cylinder bottom oil-way shutoff valve according to claim 4, it is characterized in that: the center line of described oil through is to the radius sum of the distance of back-up ring between a side of pipe joint more than or equal to diameter and the oil through of seal ring; The center line of oil through to the distance of oil duct inner bottom surface is less than or equal to poor to the distance of oil duct inner bottom surface and oil through radius of inserting end end face that pipe joint stretches into cylinder bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220519860 CN202789815U (en) | 2012-10-11 | 2012-10-11 | Cylinder bottom oil way cutting-off valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220519860 CN202789815U (en) | 2012-10-11 | 2012-10-11 | Cylinder bottom oil way cutting-off valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202789815U true CN202789815U (en) | 2013-03-13 |
Family
ID=47817081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220519860 Expired - Lifetime CN202789815U (en) | 2012-10-11 | 2012-10-11 | Cylinder bottom oil way cutting-off valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202789815U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103573747A (en) * | 2013-08-08 | 2014-02-12 | 安徽瑞发轨道交通设备有限公司 | Embedded type explosive-proof pipe safety valve |
-
2012
- 2012-10-11 CN CN 201220519860 patent/CN202789815U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103573747A (en) * | 2013-08-08 | 2014-02-12 | 安徽瑞发轨道交通设备有限公司 | Embedded type explosive-proof pipe safety valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Oil way isolating valve for cylinder bottom Effective date of registration: 20171207 Granted publication date: 20130313 Pledgee: Xianju County Rural credit cooperatives credit cooperatives should be Fu Pledgor: ZHEJIANG WANHE CONSTRUCTION Co.,Ltd. Registration number: 2017330000265 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |
|
| CX01 | Expiry of patent term |