CN102032238B - External control type self-locking hydraulic cylinder - Google Patents

External control type self-locking hydraulic cylinder Download PDF

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Publication number
CN102032238B
CN102032238B CN 201110009059 CN201110009059A CN102032238B CN 102032238 B CN102032238 B CN 102032238B CN 201110009059 CN201110009059 CN 201110009059 CN 201110009059 A CN201110009059 A CN 201110009059A CN 102032238 B CN102032238 B CN 102032238B
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CN
China
Prior art keywords
locking
cylinder
hydraulic
oil
piston
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CN 201110009059
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Chinese (zh)
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CN102032238A (en
Inventor
薛洪权
奚金法
余彦冬
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江阴市洪腾机械有限公司
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Priority to CN 201110009059 priority Critical patent/CN102032238B/en
Publication of CN102032238A publication Critical patent/CN102032238A/en
Application granted granted Critical
Publication of CN102032238B publication Critical patent/CN102032238B/en

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Abstract

The invention relates to an external control type self-locking hydraulic cylinder, comprising a cylinder body and a piston rod assembly which is arranged in the cylinder body and can move freely. The external control type self-locking hydraulic cylinder is characterized in that a locking cylinder barrel is internally provided with a locking piston, and the locking piston divides the locking cylinder barrel into an unlocking oil cavity and a locking oil cavity; hydraulic oil flows in and out of the unlocking oil cavity through an unlocking oil cavity oil port on the locking cylinder barrel, and the hydraulic oil flows in and out of the locking oil cavity through a locking oil cavity oil port on the locking cylinder barrel; the locking oil cavity is internally provided with a large spring; the center of the locking piston is provided with an inner hole which is provided with a small spring and a sliding sleeve; 4-8 annular grooves are arranged on the inner wall of the inner hole of the locking piston; the left side of the cylinder body is provided with a thin-wall sleeve, round holes are arranged on the thin-wall sleeve in the radial direction, and each round hole is internally provided with a steel ball; and an annular groove is arranged on the step surface on the left side of the piston rod assembly. The invention has the advantages of better flexibility for unlocking and better reliability for locking.

Description

A kind of externally controlled type self locking hydraulic cylinder

Technical field

The present invention relates to a kind of self locking hydraulic cylinder, relate in particular to a kind of externally controlled type self locking hydraulic cylinder.

Background technique

Oil hydraulic cylinder is the executive component in the hydraulic system, it usually with hydraulic oil as working medium, the mechanical energy that the hydraulic pressure of liquid can be converted to straight line motion or rotatablely moves.Oil hydraulic cylinder is made up of several parts such as cylinder body, piston rod, piston, cylinder head and sealing systems usually.At present, oil hydraulic cylinder is extensively applied to fields such as industrial or agricultural and Aero-Space.Along with the quickening of national urbanization pace of construction, the cleaning in city, afforest and beautify work and seem particularly important.The cleaning works amount of road of city street refuse is also increasing.At present, in some large-and-medium size cities, progressively adopt refuse cleaning vehicle to replace the traditional hand cleaning.Sweep showing and regain and adopting oil hydraulic cylinder to realize of arm on the refuse cleaning vehicle.During cleaning work, hydraulic cylinder piston rod stretches out, and sweeps arm and shows, and sweeps dish and starts working; During driving, hydraulic cylinder piston rod drives sweeps dish withdrawal and locking, guarantees traffic safety.At present, the locking of hydraulic cylinder piston rod is to adopt the Pilot operated check valve on the hydraulic system to realize.In theory, as long as oil hydraulic cylinder rod chamber fluid is not discharged by the fluid-control one-way valve closure, the piston rod of oil hydraulic cylinder just can not stretch out automatically.But, leak owing to inevitably exist on Pilot operated check valve self and the hydraulic cylinder piston, so after long-time, the piston rod of oil hydraulic cylinder also can slowly stretch out, and has a strong impact on traffic safety.So, also having on the present refuse cleaning vehicle and adopt internal control formula self locking hydraulic cylinder, the dependence spring force of locking of this internal control formula self locking hydraulic cylinder unblanks to rely on the rodless cavity hydraulic coupling.After the piston rod of this oil hydraulic cylinder takes in oil cylinder fully, rely on the automatic locking piston rod of spring force on the mechanical lock, when piston rod need stretch out, supply with the oil pressure of oil hydraulic cylinder rodless cavity and at first open mechanical lock, and then pushing piston-rod.The use of this internal control formula self locking hydraulic cylinder has reduced the possibility that piston rod stretches out voluntarily greatly, has guaranteed traffic safety effectively.But this internal control formula self locking hydraulic cylinder in use also finds to exist certain problem.Because when refuse cleaning vehicle was swept arm and do not worked, the rodless cavity of internal control formula self locking hydraulic cylinder was on the return line that is connected in the hydraulic system.Simultaneously; Other the oil return of hydraulic actuator of car load also all is to be aggregated on the same return line; So the action of other hydraulic element can cause the situation that occurs instantaneous pressure on the return line, this high pressure can be delivered to the rodless cavity of internal control formula self locking hydraulic cylinder.Because the rodless cavity hydraulic coupling of unblanking to rely on of internal control formula self locking hydraulic cylinder, the high pressure that this moment passes over can be opened the latch mechanism of internal control formula self locking hydraulic cylinder automatically, causes misoperation, thereby has influence on the working efficiency and the Security of vehicle.

Summary of the invention

To above-mentioned shortcoming, the object of the present invention is to provide a kind of more flexible, more reliable externally controlled type self locking hydraulic cylinder of locking of unblanking.

Technology contents of the present invention does; A kind of externally controlled type self locking hydraulic cylinder; Comprise cylinder body and be contained in the piston rod assembly that its inside can move freely, piston rod assembly right side step surface cooperates with the guide sleeve slipper seal, and piston rod assembly is divided into rodless cavity and rod chamber with cylinder body; Rodless cavity is through the turnover of the rodless cavity hydraulic fluid port on cylinder body hydraulic oil, and rod chamber is through the turnover of the rod chamber hydraulic fluid port on cylinder body hydraulic oil; The left end of cylinder body is fixed with the locking cylinder barrel; It is characterized in that in locking cylinder barrel inside the lock piston that can move freely being housed, lock piston will lock cylinder barrel and be divided into unblank oil pocket and locking oil pocket; Unblank oil pocket through the oil pocket hydraulic fluid port turnover hydraulic oil of unblanking on the locking cylinder barrel, and the locking oil pocket is through the locking oil pocket hydraulic fluid port turnover hydraulic oil on the locking cylinder barrel; In the locking oil pocket big spring is housed, big spring one end is pressed on the lock piston, and the other end is pressed on the cylinder body; The center of lock piston offers endoporus, and endoporus is equipped with little spring and sliding sleeve, and little spring one end is pressed on the lock piston, and the other end is pressed on the sliding sleeve, and sliding sleeve can slide in the endoporus of lock piston flexibly; On the inwall of the endoporus of lock piston, be provided with 4~8 annular grooves, the transverse section of annular groove is semicircle; Cylinder body left side is the thin-walled cover, and thin-walled puts and radially has and annular groove circular hole one to one, and a steel ball is housed in each circular hole; Piston rod assembly left side step surface is provided with and circular hole annular groove one to one, and the transverse section of annular groove be a semicircle.

The radius of steel ball is slightly less than the radius of annular groove and annular groove in above-mentioned externally controlled type self locking hydraulic cylinder; When unblanking, steel ball is contained in the annular groove, and steel ball is contained in the annular groove during locking.

The present invention has increased the mechanical lock mechanism of oil outer pressure-controlled, its compact structure on the basis of original oil hydraulic cylinder; Piston rod can remain on locked position the long period; Can not stretch out voluntarily because of external force or deadweight, make locking of the present invention reliable, unblank flexibly, the pressure loss is little; Withstand voltage height, leak little, steadily no shock and vibration when the action of open and close lock.

The advantage that the present invention is compared with prior art had is:

(1), the present invention adopts the externally controlled type hydraulic power to realize unblanking and locking, locking is reliable, has prevented the potential safety hazard that piston rod stretches out voluntarily.

(2), piston rod of the present invention is fully retracted and locking after, can deenergization and other power sources, under the situation that the external control hydraulic power is not provided, piston rod can the long period keep lockup state, saves the energy.

(3), stable performance of the present invention, compact structure, steadily no shock and vibration when the action of open and close lock.

Description of drawings

Fig. 1 is the structural representation of unlocking condition of the present invention.

Fig. 2 is the structural representation of blocking of the present invention.

Specific embodiment

Below in conjunction with concrete accompanying drawing the present invention is further specified.

As depicted in figs. 1 and 2; A kind of externally controlled type self locking hydraulic cylinder; Comprise cylinder body 9 and be contained in the piston rod assembly 12 that its inside can move freely, piston rod assembly 12 right side step surfaces cooperate with guide sleeve 14 slipper seals, and piston rod assembly 12 is divided into rodless cavity 11 and rod chamber 13 with cylinder body 9; Rodless cavity 11 is through the 9.1 turnover hydraulic oil of the rodless cavity hydraulic fluid port on the cylinder body 9, and rod chamber 13 is through the 9.2 turnover hydraulic oil of the rod chamber hydraulic fluid port on the cylinder body 9; The left end of cylinder body 9 is fixed with locking cylinder barrel 2; It is characterized in that in locking cylinder barrel 2 inside the lock piston 3 that can move freely being housed, lock piston 3 will lock cylinder barrel 2 and be divided into unblank oil pocket 1 and locking oil pocket 6; Unblank oil pocket 1 through the oil pocket hydraulic fluid port 2.1 turnover hydraulic oil of unblanking on the locking cylinder barrel 2, and locking oil pocket 6 is through the 2.2 turnover hydraulic oil of the locking oil pocket hydraulic fluid port on the locking cylinder barrel 2; Big spring 5 is housed in the locking oil pocket 6, and big spring 5 one ends are pressed on the lock piston 3, and the other end is pressed on the cylinder body 9; The center of lock piston 3 offers endoporus 3.1, and endoporus 3.1 is equipped with little spring 4 and sliding sleeve 8, and little spring 4 one ends are pressed on the lock piston 3, and the other end is pressed on the sliding sleeve 8, and sliding sleeve 8 can slide for 3.1 li at the endoporus of lock piston 3 flexibly; On the inwall of the endoporus 3.1 of lock piston 3, be provided with 6 annular grooves 7, the transverse section of annular groove 7 is semicircle; Cylinder body 9 left sides are thin-walled cover 9.3, radially have on the thin-walled cover 9.3 6 with annular groove 7 circular hole 9.4 one to one, a steel ball 15 is housed in each circular hole 9.4; Piston rod assembly 12 left side step surfaces be provided with 6 with circular hole 9.4 annular groove 10 one to one, the transverse section of annular groove 10 be a semicircle.

Working principle of the present invention and working procedure are following:

As shown in Figure 2; Lock operation: when 9.2 oil-feeds of rod chamber hydraulic fluid port, rodless cavity hydraulic fluid port 9.1 and 2.2 oil returns of locking oil pocket hydraulic fluid port be not when the oil pocket hydraulic fluid port 2.1 of unblanking is worked; Hydraulic oil gets into rod chamber 13; Hydraulic oil promotes piston rod assembly 12 to left movement, piston rod assembly 12 withdrawals, and the fluid in the rodless cavity 11 is discharged through rodless cavity hydraulic fluid port 9.1.Push up the right side of sliding sleeve 8 when piston rod assembly 12 after, promote sliding sleeve 8 compression little springs 4 together to left movement.After piston rod assembly 12 moved to the end left, annular groove 10 just moved to steel ball 15 present positions.Then, 2.2 oil-feeds of locking oil pocket hydraulic fluid port, oil pocket hydraulic fluid port 2.1 oil returns of unblanking, hydraulic oil gets into locking oil pocket 6.Under the acting in conjunction of the spring force of hydraulic coupling and big spring 5; Lock piston 3 is deviate from the annular groove 7 of steel ball 15 on lock piston 3 to left movement, and gets in the annular groove 10 on the piston rod assembly 12; The hydraulic oil of unblanking in the oil pocket 1 simultaneously, is discharged from the oil pocket hydraulic fluid port 2.1 of unblanking.After lock piston 3 moves to the end left, can reliably steel ball 15 be squeezed in 6 place's radial holes and annular groove 10 of cylinder body 9 left side thin-walled covers, thus the motion of lockup piston bar assembly 12.

As shown in Figure 1, unlock operation: when oil pocket hydraulic fluid port 2.1 oil-feeds of unblanking, 2.2 oil returns of locking oil pocket hydraulic fluid port, when rod chamber hydraulic fluid port 9.2 was not worked with rodless cavity hydraulic fluid port 9.1, hydraulic oil got into the oil pocket 1 of unblanking, and hydraulic oil promotes lock piston 3 compression big springs 5 and moves right.After lock piston 3 moved right on earth, annular groove 7 just moved to steel ball 15 present positions.Rodless cavity hydraulic fluid port 9.1 oil-feeds then; 9.2 oil returns of rod chamber hydraulic fluid port, hydraulic oil gets into rodless cavity 11, and hydraulic oil promotes piston rod assembly 12 and moves right; Deviate from the annular groove 10 of steel ball 15 from piston rod assembly 12, and get in the annular groove 7 on the lock piston 3.When piston rod assembly 12 moved right, sliding sleeve 8 was followed piston rod assembly 12 and is moved right together under the promotion of little spring 4 spring forces.After steel ball 15 was deviate from from annular groove 10 fully, this moment, piston rod assembly 12 complete releases freely moved right under the promotion of hydraulic coupling.When sliding sleeve 8 moves right limit position, can reliably steel ball 15 be squeezed in six place's radial holes and annular groove 7 of cylinder body 9 left side thin-walled covers, for locking is next time got ready.

Claims (1)

1. externally controlled type self locking hydraulic cylinder; Comprise cylinder body (9) and be contained in the piston rod assembly (12) that its inside can move freely; Piston rod assembly (12) right side step surface cooperates with guide sleeve (14) slipper seal, and piston rod assembly (12) is divided into rodless cavity (11) and rod chamber (13) with cylinder body (9); Rodless cavity (11) is through the turnover of the rodless cavity hydraulic fluid port (9.1) on the cylinder body (9) hydraulic oil, and rod chamber (13) is through the turnover of the rod chamber hydraulic fluid port (9.2) on the cylinder body (9) hydraulic oil; The left end of cylinder body (9) is fixed with locking cylinder barrel (2); It is characterized in that in locking cylinder barrel (2) inside the lock piston (3) that can move freely being housed, lock piston (3) will lock cylinder barrel (2) and be divided into oil pocket of unblanking (1) and locking oil pocket (6); Unblank oil pocket (1) through oil pocket hydraulic fluid port (2.1) the turnover hydraulic oil of unblanking on the locking cylinder barrel (2), and locking oil pocket (6) is through the turnover of the locking oil pocket hydraulic fluid port (2.2) on the locking cylinder barrel (2) hydraulic oil; Big spring (5) is housed in the locking oil pocket (6), and big spring (5) one ends are pressed on the lock piston (3), and the other end is pressed on the cylinder body (9); The center of lock piston (3) offers endoporus (3.1); Endoporus (3.1) is equipped with little spring (4) and sliding sleeve (8); Little spring (4) one ends are pressed on the lock piston (3); The other end is pressed on the sliding sleeve (8), and sliding sleeve (8) can slide in endoporus (3.1) lining of lock piston (3) flexibly; On the inwall of the endoporus (3.1) of lock piston (3), be provided with 4~8 annular grooves (7), the transverse section of annular groove (7) is semicircle; Cylinder body (9) left side be thin-walled cover (9.3), radially has on the thin-walled cover (9.3) and annular groove (7) circular hole (9.4) one to one, and a steel ball (15) is housed in each circular hole (9.4); Piston rod assembly (12) left side step surface is provided with and circular hole (9.4) annular groove (10) one to one, and the transverse section of annular groove (10) be a semicircle.
CN 201110009059 2011-01-17 2011-01-17 External control type self-locking hydraulic cylinder CN102032238B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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CN102032238A CN102032238A (en) 2011-04-27
CN102032238B true CN102032238B (en) 2012-12-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104006032A (en) * 2014-05-09 2014-08-27 中船重工中南装备有限责任公司 Two-direction mechanical locking hydraulic cylinder

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102501112B (en) * 2011-11-02 2013-06-12 山东常林机械集团股份有限公司 Quick repeated positioning device for machining
CN102913512B (en) * 2012-10-09 2015-12-16 哈尔滨工程大学 A kind of hydraulic locking mechanism
CN102943786B (en) * 2012-12-11 2015-08-12 湖南特力液压有限公司 Oil hydraulic cylinder
CN103452950B (en) * 2013-09-18 2016-02-10 沈阳飞机工业(集团)有限公司 A kind of hydraulic combination cylinder
CN104006033A (en) * 2014-05-09 2014-08-27 中船重工中南装备有限责任公司 Powerful and mechanical automatic-locking hydraulic cylinder
CN104405726B (en) * 2014-11-17 2018-03-13 徐州耐克盾机械制造有限公司 A kind of self-locking oil cylinder

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Publication number Priority date Publication date Assignee Title
US6257117B1 (en) * 1999-03-23 2001-07-10 Nambu Co., Ltd. Cylinder apparatus
CN101576102A (en) * 2009-06-08 2009-11-11 南京晨光集团有限责任公司 Mechanical self-locking hydraulic cylinder
CN101625003A (en) * 2009-07-29 2010-01-13 贵州枫阳液压有限责任公司 Two-stage locking cylinder
CN101782090A (en) * 2010-03-10 2010-07-21 无锡市长江液压缸厂 Double self locking hydraulic cylinder
CN201982411U (en) * 2011-01-17 2011-09-21 江阴市洪腾机械有限公司 External control type self-locking hydraulic cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257117B1 (en) * 1999-03-23 2001-07-10 Nambu Co., Ltd. Cylinder apparatus
CN101576102A (en) * 2009-06-08 2009-11-11 南京晨光集团有限责任公司 Mechanical self-locking hydraulic cylinder
CN101625003A (en) * 2009-07-29 2010-01-13 贵州枫阳液压有限责任公司 Two-stage locking cylinder
CN101782090A (en) * 2010-03-10 2010-07-21 无锡市长江液压缸厂 Double self locking hydraulic cylinder
CN201982411U (en) * 2011-01-17 2011-09-21 江阴市洪腾机械有限公司 External control type self-locking hydraulic cylinder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104006032A (en) * 2014-05-09 2014-08-27 中船重工中南装备有限责任公司 Two-direction mechanical locking hydraulic cylinder
CN104006032B (en) * 2014-05-09 2016-01-20 中船重工中南装备有限责任公司 The locked oil hydraulic cylinder of a kind of two-way mechanical

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