CN207513984U - Hydraulic cylinder - Google Patents
Hydraulic cylinder Download PDFInfo
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- CN207513984U CN207513984U CN201721296818.8U CN201721296818U CN207513984U CN 207513984 U CN207513984 U CN 207513984U CN 201721296818 U CN201721296818 U CN 201721296818U CN 207513984 U CN207513984 U CN 207513984U
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- valve
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- valve seat
- spool
- baffle
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Abstract
The utility model is related to hydraulic cylinders, and to solve the problems, such as existing hydraulic cylinder buffering, there are be also easy to produce shake and creeping phenomenon in compression shock and start-up course；A kind of hydraulic cylinder is provided, multiple valve openings for axially penetrating through piston are provided on piston, Bidirectional buffering is provided in each valve opening, Bidirectional buffering includes two corresponding valve seats mounted on both ends in valve opening and the spool in valve opening, and interlude both ends end is corresponded to respectively forms a check valve with two valve seats；Side face of piston ring is respectively arranged with the baffle for preventing valve seat from coming off from valve opening, baffle is equipped with the through-hole connected with valve seat oil duct, the guide section at spool both ends is each passed through corresponding valve seat and baffle through-hole and protrudes on the outside of baffle, and the both ends of spool correspond to and contacted with the medial surface of cylinder head or cylinder cap when piston is located at its stroke terminal.The utility model realizes piston stroke terminal suspending in the stroke terminal of piston, which will not cause stress impact and start the phenomenon that creeping.
Description
Technical field
The utility model is related to a kind of hydraulic part, more specifically to a kind of hydraulic cylinder.
Background technology
The piston moved back and forth in hydraulic cylinder is main force-summing element with piston rod, is had very under the driving of hydraulic coupling
Big kinetic energy can carry out mechanical collision with cylinder cap and cylinder bottom when piston rapidly moves to stroke terminal, generate strong impact
And noise, the reliability and service life of oil cylinder are seriously reduced, it, need to be in piston in order to reduce the influence that impact brings oil cylinder
Increase appropriate braking when soon moving to stroke terminal, the movement velocity of piston is made to successively decrease, so as to reach to hydraulic cylinder
Protective effect.There are two types of currently used buffer structures：One kind is to increase buffering on hydraulic circuit, and one kind is hydraulic oil
Cylinder interior designs buffer unit.
The complexity of system can be increased by increasing buffer unit on hydraulic circuit, at the same cost can also rise it is more.
And buffer unit structure built in hydraulic cylinder is simple, small, and does not need to additionally to increase other control elements such as flow control valve,
It is to be widely used at present most buffering methods.Buffer structure built in existing hydraulic cylinder mostly using annular gap-type,
Principle is to reduce the speed of piston, maximum existing for this structure by generating back pressure during smaller annulus using fluid
Problem is that buffering course has very big compression shock, while easily there is shake and creeping phenomenon in start-up course, and the knot
Structure is only applicable to rodless cavity buffering, if rod chamber is needed if buffering, need to also increase a buffer unit, such as cushion collar.
Utility model content
The technical problems to be solved in the utility model is buffered there are compression shock and was started for existing hydraulic cylinder
The problem of shake and creeping phenomenon are also easy to produce in journey, and a kind of hydraulic oil of piston stroke terminal suspending no pressure impact is provided
Cylinder.
The utility model be realize its purpose technical solution be such：A kind of hydraulic cylinder is provided, including cylinder barrel, work
Stopper rod and the piston for being fixed on piston rod end, the both ends of the cylinder barrel are respectively provided with cylinder cap and cylinder head, and the piston is by described in
Cylinder barrel internal cavity is separated into rod chamber and rodless cavity；It is characterized in that multiple valves for axially penetrating through piston are provided on piston
Hole, is provided with Bidirectional buffering in each valve opening, and the Bidirectional buffering includes two and corresponding is mounted in the valve opening
The valve seat at both ends and the spool in valve opening, the spool include interlude and are less than centre positioned at interlude both ends and diameter
The guide section of section, the length of the interlude are less than the distance between valve port of two valve seats, and interlude both ends end corresponds to
A check valve is respectively formed with two valve seats；The side face of piston ring is respectively arranged with the baffle for preventing valve seat from coming off from valve opening,
The baffle is equipped with the through-hole connected with valve seat oil duct, and the guide section at the spool both ends is each passed through corresponding valve seat and gear
It plate through-hole and protrudes on the outside of baffle, the both ends that the piston is located at spool during its stroke terminal correspond to and cylinder head or cylinder cap
Medial surface contact.
In above-mentioned hydraulic cylinder, the maximum value that the spool often holds guide section to protrude into baffle length of outer side is less than two valve seats
The difference of distance and spool centre segment length between valve port.Spool and valve seat when can be moved to stroke terminal to avoid piston in this way
Between occur rigidity conflict.
In above-mentioned hydraulic cylinder, the valve opening end is equipped with positioning ladder, and the valve seat outer end has the positioning ladder
Coordinate circular orientation flange, locating flange and the positioning ladder of valve opening end coordinate, it can be achieved that the inside positioning of valve seat, is fixed on
Baffle on piston can position valve seat outward.
In above-mentioned hydraulic cylinder, the outer section of valve seat endoporus is the pilot hole with the spool guide section clearance fit, the valve
The radial direction oil hole connected with valve seat endoporus is provided on seat, the outer surface of the valve seat, which is provided with, axially crosses oil groove, the axial direction
The one end for crossing oil groove is connect with radial direction oil hole, and the other end is located on the outer end face of valve seat.
In above-mentioned hydraulic cylinder, seal groove is provided on the outer circumference surface of the valve seat, is provided in the seal groove close
Seal.
In above-mentioned hydraulic cylinder, the baffle is in annular shape and is sleeved on the piston rod.
Compared with prior art, the utility model passes through double on piston the utility model in the end-of-travel position of piston
To the rod chamber and rodless cavity of buffer unit connection piston both sides, the active force that hydraulic oil is acted on piston is reduced, realizes and lives
Stroke terminal buffering is filled in, which will not cause stress impact and start the phenomenon that creeping.
Description of the drawings
Fig. 1 is that the utility model hydraulic cylinder is in cylinder head end buffer status schematic diagram.
Fig. 2 is that the utility model hydraulic cylinder is in head side buffer status schematic diagram.
Fig. 3 be in this Fig. 1 D-D to sectional view.
Fig. 4 is baffle arrangement schematic diagram in the utility model hydraulic cylinder.
Fig. 5 is the sectional view of piston in the utility model hydraulic cylinder.
Fig. 6 is the sectional view of valve seat in the utility model hydraulic cylinder.
Fig. 7 is the structure diagram of valve seat in the utility model hydraulic cylinder.
Fig. 8 is the structure chart of spool in the utility model hydraulic cylinder.
Parts title and serial number in figure：
Cylinder barrel 1, rod chamber 101, rodless cavity 102, piston rod 2, baffle 3, pin hole 301, through-hole 302, piston 4, valve opening
401, location hole 402, pin hole 403, valve seat 5, seal groove 501, radial direction oil hole 502, pilot hole 503, axial direction oil groove 504 excessively, valve
Core 6, sealing ring 7, baffle ring 8, cylinder head 9, locking nut 10, cylinder cap 11, pin 12.
Specific embodiment
Illustrate specific embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 1 Fig. 2, the hydraulic cylinder in the present embodiment includes cylinder barrel 1, piston rod 2 and is fixed on piston rod end
Piston 4, the both ends of cylinder barrel 1 are respectively provided with cylinder cap 11 and cylinder head 9, and 1 internal cavity of cylinder barrel is separated into 101 He of rod chamber by piston 4
Rodless cavity 102；Multiple valve openings 401 for axially penetrating through piston are provided on piston 4, the quantity of valve opening 401 is according to oil cylinder parameter
It determines, valve opening 401 is circumferentially uniformly distributed generally about 4 center of piston.401 both ends of valve opening connect rod cavity and rodless cavity.In each valve opening 401
Bidirectional buffering is both provided with, Bidirectional buffering includes two corresponding valve seats 5 for being mounted on 401 both ends of valve opening and positioned at valve
Spool 6 in hole.As shown in figure 8, spool 6 includes interlude 601 and positioned at 601 both ends guide section 602 of interlude, interlude
A diameter of D6, a diameter of D5 of guide section, D6 be more than D5, interlude 601 and guide section 602 it is cylindrical and they between by justifying
The conical surface is excessive.
Valve seat 5 is inner end adjacent to the end at 401 middle part of valve opening, and the end far from 401 middle part of valve opening is outer end.Valve seat center
With the endoporus axially through valve seat, the inner end wall surface of endoporus is circular conical surface, valve port is formed, in valve seat 5 and the interlude of spool 6
During 601 end contact, the transition taper-face contact shape on the circular conical surface and spool on 5 endoporus of valve seat between interlude and guide section
Into linear sealing, and then form check valve.
The aperture of outer end of hole is slightly larger than the pilot hole 503 of 602 diameter of spool guide section in valve seat 5, and the pilot hole 503 is with leading
To 602 clearance fit of section, radial positioning is carried out to spool 6 so as to fulfill both ends valve seat 5, spool 6 is avoided to move radially, valve
602 end of guide section of core 6 is stretched out from the pilot hole 503 of valve seat 5.
The both ends of valve opening 401 are outer end, and 401 outer end of valve opening is location hole 402, and the aperture D1 of location hole 402 is more than valve
The aperture D2 in hole 401, step forms the axially position step of valve seat between location hole 402 and valve opening 401.The outer end tool of valve seat 5
There is locating flange 505, the diameter D3 of locating flange 505 is more than the internal diameter D2 of valve opening 401, and locating flange 505 is located at valve opening outer end
Location hole 402 in.
Baffle 3 is respectively provided at the both ends of piston 4, baffle 3 is sleeved on piston rod 2, when piston 4 is solid by locking nut 10
When Dingan County is mounted in 2 end of piston rod, baffle 3 is also fixed on the two sides of piston 4 by locking nut 10 simultaneously.Baffle 3 blocks
Valve seat 5 prevents valve seat 5 from coming off from valve opening 401.Pin hole 301 is provided on baffle 3, piston 4 is provided with 403 baffle of pin hole and leads to
It crosses pin hole 301,403 and pin 12 carries out positioning assembling.
As shown in Fig. 5 Fig. 6, the position positioned at 503 axially inner side of pilot hole on valve seat 4 is provided with multiple radial direction oil holes
502, the endoporus of one end connection valve seat 5 of radial direction oil hole 502, the other end is located at the external peripheral surface of valve seat 5.In the circle of valve seat 5
It is provided on poppet surface and axially crosses oil groove 504, axial one end for crossing oil groove 504 is connect with radial direction oil hole 502, and the other end is located at valve
On the outer end end face of seat 5.
As shown in figure 4, through-hole 302 corresponding with valve opening on piston and pin hole 301, the through-hole are provided on baffle 3
302 aperture D4 is less than the diameter D3 of valve seat outer end, and the outer end of spool guide section 602 passes through pilot hole 503, the baffle 3 of valve seat
On through-hole 302 and protrude into the outside of baffle 3.Through-hole 302 is with axially crossing the outer end of oil groove 504 in axis on baffle 3 on valve seat 5
Projection with overlapping or passes through oil groove oil communication on direction.
As shown in Fig. 6 Fig. 7, seal groove 501 is provided on valve seat outer circumference surface, seal groove 501 is located at radial direction oil hole
Axially inner side is provided with sealing ring 7 and baffle ring 8, as shown in Figure 1 in seal groove 501.
As shown in Fig. 1 Fig. 2, contacted when spool 6 is moved to the transition conical surface on spool 6 in valve opening 401 with valve port on valve seat 4
When form the close structure of line, the length of lateral surface of 602 outer end of spool guide section protrusion baffle 3 reaches maximum value, and the maximum value is small
In the distance between valve port of two valve seats with the length of spool interlude namely when the outer end of spool guide section and the outside of baffle
When face flushes, the other end of spool interlude does not have with the valve port of corresponding valve seat and contacts, and can be ensured that oil circuit is unimpeded in this way,
Rigid collision will not occur simultaneously.
In the present embodiment, when filling pressure oil in rod chamber, as shown in Figure 1, spool under the action of pressure oil to the right
Mobile, the end of spool interlude is contacted with the valve port of the valve seat on right side realizes linear sealing, the closed check valve, spool interlude
Left end and the valve seat valve port in left side disengage, and the check valve of the side is opened always, rod chamber and rodless cavity cut-off, when piston moves
When moving end of travel, the outer end of the guide section of spool right end contacted with the medial surface of cylinder head and stop movement, with piston after
Continuous movement, spool opposing pistons are moved to the left, and the valve port of the right end of spool interlude and the valve seat on right side disengages, and leads to this
Check valve is opened, and rod chamber connects with rodless cavity, and the hydraulic oil of rod chamber flows out after entering rodless cavity by the twoth valve seat,
The release of rod chamber, so as to fulfill the buffering of end of travel.Equally, when the promotion of piston hydraulic oil in rodless cavity is to cylinder cap
When direction is moved, in shift motion end, spool guide section contacts first with the medial surface of cylinder cap, realizes rod chamber and rodless cavity
Connection, realizes the release of rodless cavity and buffers.
Claims (6)
1. a kind of hydraulic cylinder, including cylinder barrel, piston rod and the piston for being fixed on piston rod end, the both ends difference of the cylinder barrel
With cylinder cap and cylinder head, the cylinder barrel internal cavity is separated into rod chamber and rodless cavity by the piston；It is characterized in that in piston
On be provided with multiple valve openings for axially penetrating through piston, Bidirectional buffering, the Bidirectional buffering are provided in each valve opening
Including two it is corresponding be mounted on the valve seats at both ends and the spool in valve opening in the valve opening, the spool include interlude and
Positioned at interlude both ends and diameter is less than the guide section of interlude, and the length of the interlude is less than between the valve port of two valve seats
Distance, interlude both ends end is corresponded to respectively forms a check valve with two valve seats；The side face of piston ring is respectively arranged with
The baffle that valve seat comes off from valve opening is prevented, the baffle is equipped with the through-hole connected with valve seat oil duct, the spool both ends
Guide section is each passed through corresponding valve seat and baffle is projected on the outside of baffle, and the piston is located at spool during its stroke terminal
Both ends correspond to contacted with the medial surface of cylinder head or cylinder cap.
2. hydraulic cylinder according to claim 1, it is characterised in that the spool often holds guide section to protrude on the outside of baffle
The maximum value of length is less than the difference of distance and spool centre segment length between two valve seat valve ports.
3. hydraulic cylinder according to claim 1, it is characterised in that the valve opening end is equipped with positioning ladder, the valve seat
Outer end has the positioning ladder cooperation circular orientation flange.
4. hydraulic cylinder according to claim 3, it is characterised in that the outer section of valve seat endoporus is intersegmental with spool guiding
The location hole of gap cooperation, the valve seat are provided with the radial direction oil hole connected with valve seat endoporus, and the outer surface of the valve seat is provided with
Axial to cross oil groove, described axial one end for crossing oil groove is connect with radial direction oil hole, and the other end is located on the outer end face of valve seat.
5. hydraulic cylinder according to any one of claim 1 to 4, it is characterised in that set on the outer circumference surface of the valve seat
Seal groove is equipped with, sealing ring is provided in the seal groove.
6. hydraulic cylinder according to claim 1, it is characterised in that the baffle is in annular shape and is sleeved on the piston
On bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721296818.8U CN207513984U (en) | 2017-10-10 | 2017-10-10 | Hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721296818.8U CN207513984U (en) | 2017-10-10 | 2017-10-10 | Hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207513984U true CN207513984U (en) | 2018-06-19 |
Family
ID=62534134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721296818.8U Active CN207513984U (en) | 2017-10-10 | 2017-10-10 | Hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207513984U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946587A (en) * | 2020-08-24 | 2020-11-17 | 中国石油化工集团有限公司 | Self-pressure-discharging adjustable buffer gas pressure cylinder |
| CN112112861A (en) * | 2020-09-17 | 2020-12-22 | 徐州徐工液压件有限公司 | Two-way balanced double-acting buffering device for hydraulic cylinder piston |
-
2017
- 2017-10-10 CN CN201721296818.8U patent/CN207513984U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111946587A (en) * | 2020-08-24 | 2020-11-17 | 中国石油化工集团有限公司 | Self-pressure-discharging adjustable buffer gas pressure cylinder |
| CN112112861A (en) * | 2020-09-17 | 2020-12-22 | 徐州徐工液压件有限公司 | Two-way balanced double-acting buffering device for hydraulic cylinder piston |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230310 Address after: 545000 No. 6, Yangtai Road, Yanghe industrial new area, Liuzhou City, Guangxi Zhuang Autonomous Region Patentee after: Guangxi Zhongyuan Machinery Co.,Ltd. Patentee after: GUANGXI LIUGONG MACHINERY Co.,Ltd. Address before: 545006 1 ho Cheung Road, Yufeng District, Liuzhou, the Guangxi Zhuang Autonomous Region (Yanghe industrial new area) Patentee before: LIUZHOU LIUGONG HYDRAULIC COMPONENTS Co.,Ltd. Patentee before: GUANGXI LIUGONG MACHINERY Co.,Ltd. |
|
| TR01 | Transfer of patent right |