CN208565104U - Bidirectional hydraulic lock - Google Patents

Abstract

The utility model relates to a kind of bidirectional hydraulic locks, the peripheral wall of the valve port of the valve pocket of the check valve of the bidirectional hydraulic lock, which is also formed with from valve port position to plunger direction, to be extended, can offset with the end face of the respective side of the plunger with the annular extension of stop plunger movement, the development length of annular extension is less than the length of plunger rod, drives spool so that plunger rod can pass through the annular extension；The first gap for hydraulic oil circulation is formed between the outer wall of annular extension and the inner wall of valve body, the second gap for hydraulic oil circulation is formed between the inner wall of annular extension and the outer wall of plunger rod, annular extension is also provided with several throttling passages to circulate between the first gap and the second gap for hydraulic oil.The annular extension of annular hydraulic lock can limit the propulsion stroke of plunger, avoid plunger rod from deforming or be broken because stress is excessive, improve the service life of hydraulic lock, and more steady in the course of work of the bidirectional hydraulic lock.

Description

Bidirectional hydraulic lock

Technical field

The utility model relates to a kind of hydraulic control device more particularly to a kind of bidirectional hydraulic locks.

Background technique

Hydraulic lock, a kind of device playing the role of locking in hydraulic cylinder oil circuit, it can make weight reliable with executing agency Ground is parked on any position of need of work, plays locking pressure maintaining effect, guarantees that host work is safe and reliable.

Such as application No. is the Chinese invention patents of CN201410118740.5 (Publication No. CN104948532A) to disclose " a kind of bidirectional hydraulic lock ", the bidirectional hydraulic lock, including valve body, left spool, right spool, two push rods and a piston, in valve There are two valve chambers for setting in vivo, and left spool or right spool are provided in valve chamber, and piston, piston difference are provided in the middle part of valve body It is connect by push rod with left spool or right spool, each valve chamber passes through pipeline respectively and is connected with an oil inlet and an oil outlet It connects, spool can block the pipeline between oil inlet and oil outlet, be provided with the bullet connecting with valve body in left spool or right spool Spring, the pipeline can be to piston discharge pressure oil.

This bidirectional hydraulic lock also has certain deficiency, for example, hydraulic oil enters from the oil inlet of the bidirectional hydraulic lock It is the spool and piston directly acted in valve chamber afterwards, this will result in hydraulic lock when being turned on or off, and enter valve at a high speed The hydraulic oil of chamber forms severe impact to spool and piston, occurs shaking or oscillation phenomenon, seriously affects the normal of lifting equipment Operation；Secondly, when opening and closing and in the course of work of the hydraulic lock, the push rod at left and right sides of piston acts in valve chamber always Spool, however when hydraulic oil high speed enters valve chamber, the internal pressure of valve chamber is larger, and push rod also becomes very the propulsion stroke of spool Greatly, then the deformation for being easy to appear push rod is even broken, lead to unit exception, the serious curtailment service life of hydraulic lock.

Therefore existing bidirectional hydraulic lock also requires further improvement.

Utility model content

For the current state of the art, the technical problem to be solved by the utility model is to provide a kind of the double of stable action To hydraulic lock.

Technical solution adopted by the utility model to solve the above technical problems is as follows: a kind of bidirectional hydraulic lock, comprising: valve Body, the valve body have the first valve chamber of coaxial arrangement, the second valve chamber；And plunger, the plunger are slidingly disposed in the valve body, And first valve chamber is isolated with the second valve chamber；And two check valves, it is respectively arranged in the first valve chamber and the second valve chamber, institute Check valve is stated to include end cap, valve pocket, spool and in the inner cavity of the valve pocket and push up and hold elasticity between end cap and spool Part, wherein the valve pocket have valve port, the spool can be movably arranged as in the inner cavity of the valve pocket and with the valve port Sealing cooperation, the both ends of the plunger all have a plunger rod, which can slide with plunger and act on the list Check valve, which is in, to the spool of valve is turned on or off state；The peripheral wall of the valve port of the valve pocket is also formed with from valve port position Extend to the plunger direction, can offset with the corresponding side end face of the plunger to limit the mobile annular of the plunger and extend Portion, the development length of the annular extension are less than the length of the plunger rod, extend so that plunger rod can pass through the annular Portion drives the spool；The for hydraulic oil circulation is formed between the outer wall of the annular extension and the inner wall of the valve body One gap, be formed between the inner wall of the annular extension and the outer wall of the plunger rod for hydraulic oil circulation second between Gap, the annular extension are also provided with several sections to circulate between first gap and second gap for hydraulic oil Circulation road.

Preferably, the recirculation hole that the inner wall of the annular extension is formed is along the extending direction hole of annular extension Diameter gradually wide bellmouth.Due to the recirculation hole aperture along annular extension extending direction linear change, so hydraulic oil exists When circulating in the second clearance space in valve chamber, fluid flowing it is more steady, avoid generated because of cavitation abnormal sound or Vibration.

Preferably, the cone angle of the bellmouth is 20 ° -30 °.

Preferably, the plunger rod is set to the medium position of the end face of the plunger, wherein the company of plunger rod and end face It connects and is formed with tapered portion at position, the tapered portion can extend into the recirculation hole of the annular extension, stretch to described Tapered portion in recirculation hole and have between the inner wall of the annular extension can for hydraulic oil from the throttling passage into Enter to the flowing space in the second gap.The structure setting of this tapered portion can reinforce the intensity of plunger rod, avoid plunger rod It deforms or is broken because stress is excessive, and the tapered portion extend into the recirculation hole of the annular extension and will not block up Throttling passage is stated in residence, influences the entrance of hydraulic oil.

Preferably, the throttling passage is round hole.Certain throttling passage may be slotted eye, strip-shaped hole or Other can play the through-hole of throttling action.

Preferably, the round hole is four, respectively along the circumferential direction arranged for interval of the annular extension.Its In, the hydraulic oil in the first gap can be circulated in the second gap by spaced apart four round holes to meet flow need It asks.

Preferably, also there is the first hydraulic fluid port and the second hydraulic fluid port for being connected to external fueller on the valve body, wherein the One hydraulic fluid port is connected with the first valve chamber, and the second hydraulic fluid port is connected with the second valve chamber；First hydraulic fluid port, second hydraulic fluid port difference Mutual dislocation is arranged between the round hole of the annular extension in corresponding valve chamber.The structure of this dislocation arrangement, Ke Yijin One step reduces impact of the hydraulic oil to spool, improves the stability of spool work.

Preferably, the spool includes guide part and sealing, the sealing can be close with the valve port of the valve pocket Envelope cooperation, the inner wall clearance fit of the outer wall of the guide part and the valve pocket, the outer wall of the guide part of the spool with it is described The fit clearance of the inner wall of valve pocket is 0.05-0.08mm.Wherein, fit clearance can both be kept away in the range of 0.05-0.08mm Exempt from fit clearance it is too small caused by card valve problem, can also to avoid because fit clearance it is excessive so that valve sleeving inner wall can not play preferably Guiding role, and then cause the sealing of spool and valve port it is not coaxial caused by leakage problem.

Preferably, the elastic component is spring, the end of the guide part of the spool also has one for the spring Hold the accommodation groove being caught in.The accommodation groove can position one end of spring, prevent it from shifting and cause card valve problem.

Compared with prior art, the utility model has the advantage of the valve pockets of the bidirectional hydraulic lock of the utility model to be equipped with Annular extension, the annular extension can limit the propulsion stroke of plunger, avoid plunger rod deform because stress is excessive or Person's fracture, improves the service life of hydraulic lock；Secondly, the annular extension is also provided with for hydraulic oil in first gap Several throttling passages to circulate between second gap, the throttling passage can be straight to avoid the hydraulic oil for entering valve chamber at a high speed It connects and severe impact is formed to spool and plunger and occurs shaking or oscillation phenomenon, and then improve the stabilization in the spool course of work Property.

Detailed description of the invention

Fig. 1 is the schematic diagram of internal structure of the bidirectional hydraulic lock in the utility model embodiment；

Fig. 2 is sectional view along A-A in Fig. 1；

Fig. 3 is B-B direction cross-sectional view in Fig. 1；

Fig. 4 is the schematic diagram of internal structure of the check valve of the bidirectional hydraulic lock in the utility model embodiment；

Fig. 5 is the hydraulic schematic diagram of the bidirectional hydraulic lock in the utility model embodiment.

Specific embodiment

The utility model is described in further detail below in conjunction with figure embodiment.

As shown in FIG. 1 to 3, bidirectional hydraulic lock includes valve body 10, plunger 20 and check valve, and wherein valve body 10 has coaxial The first valve chamber 11, the second valve chamber 12 being arranged, plunger 20 are slidingly disposed in valve body 10, and by the first valve chamber 11 and the second valve Chamber 12 is isolated, and there are two check valves, is respectively arranged in the first valve chamber 11 and the second valve chamber 12, together refering to Fig. 4, in this implementation Example in, check valve include end cap 31, valve pocket 32, spool 33 and in the inner cavity of valve pocket 32 and push up hold in end cap 31 and spool 33 Between elastic component 34, wherein valve pocket 32 has valve port 321, and spool 33 can be movably arranged as in the inner cavity of valve pocket 32 simultaneously It seals and cooperates with valve port 321, the both ends of plunger 20 all have a plunger rod 21, and specifically, the both ends of plunger 20 have feed flow The end face 22 of pressure oil effect, plunger rod 21 are set to the medium position of the end face 22, wherein enter the first valve chamber 11 or the second valve Hydraulic oil in chamber 12 can act on the end face 22 of plunger 20, and under the pressure effect of hydraulic oil, plunger rod 21 can be with column Plug 20 slides and acts on the spool 33 of the check valve in another valve chamber, keeps check valve in the open state.In this implementation In example, in order to limit the propulsion stroke of plunger 20, avoids plunger rod 21 from deforming or be broken because stress is excessive, improve liquid The service life of lock is pressed, the peripheral wall of the valve port 321 of valve pocket 32, which is also formed with from 321 position of valve port to 20 direction of plunger, to be extended to limit The mobile annular extension 35 of position plunger 20, specifically, the end wall of annular extension 35 can offset with the end face 22 of plunger 20 Touching is to form the limit to plunger 20, under the position-limiting action of annular extension 35, for pushing up the plunger rod 21 for holding spool 33 Stress is dispersed, and avoids and deforms or be broken because stress is excessive, wherein the development length of annular extension 35 is less than The length of plunger rod 21, so that plunger rod 21 still is able to drive spool 33 across the annular extension 35, open check valve, specifically The length on ground, annular extension 35 can be adjusted according to the material and intensity of plunger rod 21, be able to satisfy it both to plunger 20 limit avoids plunger rod 21 from deforming, and the flow demand for the hydraulic oil being able to satisfy in valve chamber；In addition, annular extension 35 The first gap 40 for hydraulic oil circulation, the inner wall and plunger of annular extension 35 are formed between outer wall and the inner wall of valve body 10 The second gap 41 for hydraulic oil circulation is formed between the outer wall of bar 21, annular extension 35 is also provided with for hydraulic oil the Several throttling passages 351 to circulate between one gap 40 and the second gap 41, specifically, throttling passage 351 can be round hole, In the present embodiment, round hole is 4, respectively along the circumferential direction arranged for interval of annular extension 35, certain throttling passage 351 Or slotted eye, strip-shaped hole or other can play the through-hole of throttling action.

In order to be further reduced impact of the hydraulic oil to spool 33, improve the stability that spool 33 works, on valve body 10 with The first hydraulic fluid port 101 that external fuel feeding power device is connected, the second hydraulic fluid port 102 respectively with the annular extension in corresponding valve chamber Mutual dislocation arranges that specifically, referring to fig. 2, hydraulic oil enters from the first hydraulic fluid port 101, then along annular between 35 round hole The first gap 40 formed between the outer wall of extension 35 and the inner wall of valve body 10 carries out evenly dispersed, and the hydraulic oil after dispersion can To enter the second gap 41 by throttling passage 351,33 open check valve of spool is then acted on, wherein due to the first gap 40 and second are equipped with throttling passage 351 between gap 41, and throttling passage 351 is shifted to install with the first hydraulic fluid port 101, so having The hydraulic oil that effect avoids high speed into valve chamber directly forms severe impact to spool 33 and plunger and occurs shaking or vibrating existing As so that spool 33 is more stable during unlatching and closing.It is understood, however, that also having for connecting on valve body 10 The third hydraulic fluid port 103 and the 4th hydraulic fluid port 104 of logical external drive oil cylinder, wherein third hydraulic fluid port 103 is connected with the first valve chamber 11, 4th hydraulic fluid port 104 is connected with the second valve chamber 12.

Referring to fig. 4, it in order to enable hydraulic oil flows more steadily in 41 space of the second gap in valve chamber, avoids the occurrence of The abnormal sound generated by cavitation or vibration, the recirculation hole that the inner wall of annular extension 35 is formed are bellmouth, specifically, The aperture of the bellmouth is gradually broadening along the extending direction of annular extension 35, and specifically, the cone angle of bellmouth can be preferably 20 ° -30 °, preferable is 24 ° or 25 °.Since the aperture of the recirculation hole linearly becomes along the extending direction of annular extension 35 Change, thus fluid resistance is smaller, and then reduces the generation of cavitation, and equipment is avoided to cavitate, and improves service life. In addition, participating in Fig. 1, in the present embodiment, in order to further strengthen the intensity of plunger rod 21, avoid plunger rod 21 because of the excessive hair of stress It is also formed with tapered portion 23 at the link position of the shape that changes or fracture, plunger rod 21 and end face 22, which can stretch Enter into the recirculation hole of annular extension 35, stretches between the tapered portion 23 in recirculation hole and the inner wall of annular extension 35 With that can enter the flowing space in the second gap 41 from throttling passage 351 for hydraulic oil, i.e. the tapered portion 23 is extend into Throttling passage 351 will not be blocked in the recirculation hole of annular extension 35, influences the entrance of hydraulic oil, specifically, this can be set The entirety of tapered portion 23 can protrude fully into the recirculation hole of annular extension 35, and the cone by the way that the tapered portion 23 is arranged Angle angle is greater than the cone angle of the recirculation hole of annular extension 35, or the length of tapered portion 23 in its axial direction is arranged Degree is less than throttling passage 351 to the distance of the end wall position of annular extension 35, and Lai Shixian hydraulic oil is smooth from throttling passage 351 It enters in the second gap 41.

With continued reference to Fig. 4, the spool 33 of check valve includes guide part 331 and sealing 332, and elastic component 34 is spring, The end of the guide part 331 of middle spool 33 also has the accommodation groove 333 that one end for spring is caught in, which can be right One end of spring is positioned, and is prevented it from shifting and is caused card valve problem.In the present embodiment, the sealing 332 of spool 33 It can seal and cooperate with the valve port 321 of valve pocket 32, the outer wall of guide part 331 and the inner wall clearance fit of valve pocket 32, so that this is led To portion 331 can in the inner cavity of valve pocket 32 smooth sliding, specifically, the outer wall of the guide part 331 of spool 33 and valve pocket 32 The fit clearance of inner wall is 0.05-0.08mm.In practical applications, when the valve pocket 32 of check valve and valve body 10 are tightened, valve pocket 32 Inner hole can also generate miniature deformation, if fit clearance is too small, i.e., when fit clearance is less than 0.05mm, hydraulic lock is in use process It is easy to appear stuck phenomenon between middle spool 33 and valve pocket 32, on the contrary, if fit clearance is too big, i.e., when fit clearance is greater than When 0.08mm, the inner cavity of valve pocket 32 can not be the problem of spool 33 provide guiding role, also will appear 33 hair fastener of spool, when serious The sealing 332 of spool 33 and the valve port 321 of valve pocket 32 will appear because the two not same axis generate gap cause it is hydraulic Oil leakage, sealing performance substantially reduce.So in the present embodiment, outer wall and the valve pocket 32 of the guide part 331 of spool 33 The fit clearance of inner wall, both can be to avoid the too small caused card valve problem of fit clearance in the range of 0.05-0.08mm, can also To avoid because fit clearance is excessive cause the sealing 332 of spool 33 with valve port 321 it is not coaxial caused by leakage problem.

Referring to Fig. 1, Fig. 3 and Fig. 5, the hydraulic principle of the bidirectional hydraulic lock of the utility model are as follows: when hydraulic oil is oily from first When 101 oil inlet of mouth, hydraulic oil is introduced into the first gap 40 in the first valve chamber 11, then along the annular space in the first gap 40 It carries out circumferential dispersion and is entered in the second gap 41 by throttling passage 351, after hydraulic oil enters the second gap 41, can be made Spool 33 for check valve is allowed to be detached from valve port 321 with open check valve, and after check valve is opened, hydraulic oil is by third hydraulic fluid port 103 outflows, meanwhile, hydraulic oil can also act on the end face 22 of the end of plunger 20, be allowed to move to the direction of the second valve chamber 12 Dynamic, the plunger rod 21 of the other end of plunger 20 can drive the valve of the disengaging valve pocket 32 of spool 33 of the check valve in the second valve chamber 12 Mouth 321, after which opens, hydraulic oil enters the second valve chamber 12 by the 4th hydraulic fluid port 104, then by the second hydraulic fluid port 102 outflows；When hydraulic oil is from the second 102 oil inlet of hydraulic fluid port, principle is identical, and details are not described herein；When the first hydraulic fluid port 101 or When two hydraulic fluid ports 102 stop oil inlet, bidirectional hydraulic lock is in closed-lock state, without oil return.Wherein, in the present embodiment In, the valve pocket 32 of bidirectional hydraulic lock is equipped with annular extension 35, which can limit the propulsion row of plunger 20 Journey avoids plunger rod 21 from deforming or be broken because stress is excessive, improves the service life of hydraulic lock；Secondly, the annular Extension 35 is also provided with several throttling passages 351 to circulate between the first gap 40 and the second gap 41 for hydraulic oil, should Throttling passage 351 can enter the hydraulic oil of the first valve chamber 11 or the second valve chamber 12 directly to spool 33 and plunger to avoid high speed It forms severe impact and occurring to shake or oscillation phenomenon, and then improves the stability in 33 course of work of spool.

The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this Interior made any modifications, equivalent replacements, and improvements of novel spirit and principle etc., should be included in the guarantor of the utility model Within the scope of shield.

Claims (9)

1. a kind of bidirectional hydraulic lock, comprising:

Valve body (10), the valve body (10) have the first valve chamber (11) being coaxially disposed, the second valve chamber (12) and for outside being connected to The first hydraulic fluid port (101) and the second hydraulic fluid port (102) of portion's fueller, wherein the first hydraulic fluid port (101) is connected with the first valve chamber (11) Logical, the second hydraulic fluid port (102) is connected with the second valve chamber (12)；And

Plunger (20), the plunger (20) are slidingly disposed in the valve body (10), and by first valve chamber (11) and second Valve chamber (12) is isolated；

Two check valves are respectively arranged in the first valve chamber (11) and the second valve chamber (12), and the check valve includes end cap (31), valve It covers (32), spool (33) and is set in the inner cavity of the valve pocket (32) and pushes up the elasticity held between end cap (31) and spool (33) Part (34), wherein the valve pocket (32) has valve port (321), and the spool (33) can be movably arranged as the valve pocket (32) it sealing in inner cavity and with the valve port (321) and cooperates, the both ends of the plunger (20) all have a plunger rod (21), The plunger rod (21) can slide with plunger (20) and act on the spool (33) of the check valve, make check valve be in open or Person's closed state；

It is characterized by: the peripheral wall of the valve port (321) of the valve pocket (32) is also formed with from valve port (321) position to the plunger (20) direction extends, can offset with the end face (22) of the respective side of the plunger (20) to limit the plunger (20) mobile ring Shape extension (35), the development length of the annular extension (35) is less than the length of the plunger rod (21), so as to plunger rod (21) annular extension (35) can be passed through and drives the spool (33)；

First for hydraulic oil circulation is formed between the outer wall of the annular extension (35) and the inner wall of the valve body (10) Gap (40) is formed between the inner wall of the annular extension (35) and the outer wall of the plunger rod (21) and circulates for hydraulic oil The second gap (41), the annular extension (35) is also provided with for hydraulic oil in first gap (40) and described second Several throttling passages (351) to circulate between gap (41).

2. bidirectional hydraulic lock according to claim 1, it is characterised in that: the inner wall of the annular extension (35) is formed Recirculation hole be along the extending direction aperture of annular extension (35) gradually wide bellmouth.

3. bidirectional hydraulic lock according to claim 2, it is characterised in that: the cone angle (α) of the bellmouth is 20 ° -30 °.

4. bidirectional hydraulic lock according to claim 3, it is characterised in that: the plunger rod (21) is set to the plunger (20) End face (22) medium position, wherein be formed with tapered portion (23), institute at the link position of plunger rod (21) and end face (22) Stating tapered portion (23) can extend into the recirculation hole of the annular extension (35), stretch to the tapered portion in the recirculation hole (23) having between the inner wall of the annular extension (35) can enter for hydraulic oil from the throttling passage (351) The flowing space in second gap (41).

5. bidirectional hydraulic lock according to claim 4, it is characterised in that: the throttling passage (351) is round hole.

6. bidirectional hydraulic lock according to claim 5, it is characterised in that: the round hole is four, respectively along the ring The circumferential direction arranged for interval of shape extension (35).

7. bidirectional hydraulic lock according to claim 6, it is characterised in that: first hydraulic fluid port (101) and described second Hydraulic fluid port (102) respectively arrange between the round hole of the annular extension (35) in corresponding valve chamber by mutual dislocation.

8. described in any item bidirectional hydraulic locks according to claim 1~7, it is characterised in that: the spool (33) includes guiding Portion (331) and sealing (332), the sealing (332) can seal with the valve port (321) of the valve pocket (32) to be cooperated, institute State the outer wall of guide part (331) and the inner wall clearance fit of the valve pocket (32), wherein the outer wall of the guide part (331) with The fit clearance of the inner wall of the valve pocket (32) is 0.05-0.08mm.

9. bidirectional hydraulic lock according to claim 8, it is characterised in that: the elastic component (34) is spring, the spool (33) end of guide part (331) also has the accommodation groove (333) that one end for the spring is caught in.