CN102518618A - Hydraulic cylinder - Google Patents

Hydraulic cylinder Download PDF

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Publication number
CN102518618A
CN102518618A CN2011104429309A CN201110442930A CN102518618A CN 102518618 A CN102518618 A CN 102518618A CN 2011104429309 A CN2011104429309 A CN 2011104429309A CN 201110442930 A CN201110442930 A CN 201110442930A CN 102518618 A CN102518618 A CN 102518618A
Authority
CN
China
Prior art keywords
piston rod
oil
fixed cover
piston
gas
Prior art date
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.)
Pending
Application number
CN2011104429309A
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Chinese (zh)
Inventor
楼天汝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Tianyi Hydraulic Equipment Manufacturing Co Ltd
Original Assignee
Shandong Tianyi Hydraulic Equipment Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shandong Tianyi Hydraulic Equipment Manufacturing Co Ltd filed Critical Shandong Tianyi Hydraulic Equipment Manufacturing Co Ltd
Priority to CN2011104429309A priority Critical patent/CN102518618A/en
Publication of CN102518618A publication Critical patent/CN102518618A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a hydraulic cylinder, which comprises a piston rod, a cylinder body and a piston, wherein the piston rod has a hollow structure, and a gas cavity is formed in the piston rod; an oil cavity is formed in the cylinder body; compressed gas is filled in the gas cavity, and hydraulic oil is filled in the oil cavity; the piston is arranged in the piston rod, and the gas cavity and the oil cavity are partitioned through the piston; an O-shaped sealing ring is arranged between the piston and the inner wall of the piston rod, and a connecting device is also arranged between the piston rod and the cylinder body; a fixed cover is arranged outside the cylinder body, and a cavity is formed in the fixed cover; a movable cover is arranged outside the piston rod, a groove is formed in the cavity of the fixed cover, and the movable cover is embedded into the fixed cover through the groove; and a labyrinth passage is formed between the connecting device and the inner wall of the cylinder body, a plurality of steel balls for separating the hydraulic oil from the gas are arranged in the labyrinth passage, and the separated gas is discharged through a gas discharge device. The hydraulic cylinder has a simple structure; and the protective cover is arranged outside the cylinder, and an internal medium is safe and leak-free, so that effective elastic buffering is produced in a compression travel.

Description

A kind of hydraulic jack
Technical field
The present invention relates to a kind of hydraulic jack, particularly a kind of hydraulic jack that in compression process, plays buffer function and have protective equipment.
Background technique
Single piston hydraulic pressure oil cylinder of the prior art; The one end oil-feed one of piston two ends brings out oil, and conventional hydraulic jack is applied in heavy hydraulic machinery for example when lifting jack, excavator, bulldozer, fork truck etc., often exists hydraulic oil to reveal; Safe effect is poor, the characteristics that buffer capacity is not enough.
Simultaneously, because traditional hydraulic jack exposes outside when operation basically, great majority do not possess protective housing; Therefore hydraulic jack especially piston rod construction can not get good protection; Easy collision of assorted dirt in the environment and foreign matter or entering hydraulic jack, thus wearing and tearing and destruction oil cylinder make that leakage is more serious; And reduce working life, increased rate of fault greatly.
Summary of the invention
The object of the invention is exactly for solving technical problems such as above-mentioned; A kind of hydraulic jack is provided, and it can effectively produce elastic buffer in compression stroke through air cavity and oil pocket are set; At the removable flexible protective equipment of piston rod outer installment, cylinder body and piston rod have effectively been protected simultaneously.
The present invention is that the technological scheme that solves the problems of the technologies described above employing is:
A kind of hydraulic jack comprises piston rod, cylinder body, piston, and sell at the bottom of being respectively equipped with preceding pin of oil cylinder and oil cylinder the oil cylinder front and back; Said piston rod is a hollow structure, and its inside is provided with air cavity, and said cylinder interior is provided with oil pocket; Compressed air suits in the air cavity is full of hydraulic oil in the oil pocket, piston is arranged on piston rod inside; Piston is separated air cavity and oil pocket in oil cylinder inside, is provided with the O RunddichtringO between piston and the piston rod inwall, also is provided with retaining head and connection set between piston rod and the cylinder body; The outside of said cylinder body is provided with fixed cover, and an end of said fixed cover is fixedly connected with cylinder body through fixed block in the position of corresponding connection set, and the other end of said fixed cover links to each other with pin at the bottom of the oil cylinder through fixing device, the inner cavity that forms of said fixed cover; Said piston rod outside is provided with active cover, sells before said active cover one end and the oil cylinder to link to each other, and the other end stretches in the cavity of said fixed cover; Be provided with groove in the cavity of said fixed cover, said active cover connects through the embedding of groove phase in fixed cover;
Be provided with labyrinth channel between said connection set and the inboard wall of cylinder block, be provided with several steel balls in the labyrinth channel to separate hydraulic oil and gas, isolated gas is discharged through gas exhausting device; The outside of said cylinder body also is provided with pressure transducer, to monitor in-oil cylinder pressure.
Said fixed cover and active cover are metal material.
Be respectively equipped with unidirectional gas charging valve and unidirectional liquid-filling valve to prevent pressurized gas and hydraulic fluid leak at air cavity suction port and oil pocket filler opening.
The invention has the beneficial effects as follows: the present invention utilizes the compressible characteristics of gas, in compression stroke, produces elastic buffer, can cushion the ability that various reactions are impacted, and energy output is more stable.The present invention is provided with the Oil-gas Separation passage, guarantees that the gas of oil pocket can access separation timely and effectively, keeps best working state constantly.Hydraulic jack protective equipment of the present invention can prevent dust and other impurity, and have the elastic buffer effect, and simple in structure, easy for installation, practical application effect is better.
Description of drawings
Fig. 1 is the structural representation of hydraulic jack of the present invention.
Fig. 2 is the enlarged view of the gas oil separation structure among Fig. 1.
Fig. 3 is the side view of Fig. 1.
Fig. 4 is the structural representation of the hydraulic jack of second mode of execution of the present invention.
Among the figure, 1-suction port, 2-piston rod, 3-air cavity, 4 pistons, 5-connection set; The 6-cylinder body, 7-oil pocket, 8-filler opening, 9-labyrinth channel, 10-gas exhausting device, 11-pressure transducer; The 12-steel ball, 13-keeps off head, 14-fixed block, 15-active cover, 16-fixed cover, 17-O RunddichtringO
Embodiment
Below in conjunction with accompanying drawing the present invention is done detailed explanation.
What Fig. 1-3 described is the first embodiment of the present invention.
At first referring to figs. 1 to Fig. 2, Fig. 1 is the structural representation of hydraulic jack of the present invention.Piston rod 2 is installed in the cylinder body 6, and cylinder body 6 inside are provided with oil pocket 7, and piston rod is a hollow structure; In be provided with air cavity 3; Be provided with piston 4 in the air cavity 3, piston 4 separates air cavity 3 and oil pocket 7, is provided with the suction port 1 of pressurized gas in the air cavity 3; Be provided with the filler opening 8 of hydraulic oil in the oil pocket 7, cylinder body is provided with pressure transducer 11 to detect the oil cylinder internal pressure.Realize Oil-gas Separation being provided with O RunddichtringO 17 between piston and the piston rod through piston between the cylinder body, be connected with connection set 5 through keeping off 13 between the inwall of piston rod 2 and cylinder body 6, connection set 5 is provided with labyrinth channel.
Being in the cylinder during original state does not have pressure status, and this moment, piston rod 2 stretched out fully.Earlier air cavity 3 is filled the gas of certain pressure; Block up with the suction port of unidirectional gas charging valve with air cavity 3, the oil pocket in cylinder body 67 is full of hydraulic oil through filler opening 8 then, and charge pressure equates with air pressure; Make piston 4 be in the neutral position, filler opening is blocked with one-way valve.Use unidirectional gas charging valve and unidirectional liquid-filling valve can prevent gas and hydraulic fluid leak.During work, external force P (direction of external force P is the direction from direction to the piston rod of cylinder body, promptly among Fig. 1 from the right side to the left direction; Not shown among Fig. 1) effect under, cylinder body 6 advances inwards, the pressure of oil pocket 7 raises and promotes piston 4 to air cavity 3 motions; Along with dwindling of air cavity 3 volumes; Pressurized gas is made that by constantly compression the pressure in the air cavity 3 constantly increases, thereby produces elastic buffer.Because the volume of air cavity 3 is greater than the volume of oil pocket 7, when oil cylinder is in full reduced state, when promptly hydraulic oil all gets into air cavity 3, can not make the explosion of air cavity inwall because gas compression pressure raises yet.
Although be provided with the O RunddichtringO between piston rod and the piston; But still inevitably can bring gas that comes and a spot of gas that in compression process, produces in the process into because the leakage of pressurized gas and hydraulic oil are charging in above-mentioned working procedure; If the untimely discharge of this part gas; Will certainly cause hydraulic fluid pressure to reduce, working end pressure descends and causes working efficiency to reduce.Therefore; The present invention is provided with labyrinth channel between connection set 5 and inboard wall of cylinder block; With reference to figure 3, be provided with several steel balls in the labyrinth channel, the purpose that steel ball is set be stop hydraulic oil through in gas separation is gone out; Through after several labyrinth channels, gas is discharged through gas exhausting device 10.Special, gas exhausting device 10 is discharged one-way valve for air.
With reference to figure 1 and Fig. 3; Further described the concrete structure of the safety cover of piston rod and cylinder body, cylinder body 6, piston rod 2, fixed cover 16, the parallel mutually connection of active cover 15, wherein; Fixed cover 16 is mainly used in protection cylinder body 6, and active cover 15 is mainly used in protection piston rod 2.Link to each other through fixing bolt between fixed cover 16 and the fixed block 14, be fastenedly connected with cylinder body 6, fixed cover 16 inside are cavity; The side that fixed cover 16 links to each other with fixed block 14 is coated on the cylinder body 6 fully, in fixed cover 16 cavitys trench structure is arranged, and sells before an end of active cover 15 and the oil cylinder to link to each other; With with piston rod 2 associated movements; The other end stretches in the cavity of fixed cover 16, embeds the groove in fixed cover 16 cavitys, stablizes its motion state with this.Fixed cover of the present invention and active cover all adopt metallic material.
With reference to figure 4, it is the second embodiment of the present invention, and what they were different with first embodiment is, it uses hydraulic jack for hoist, and pressurized gas is a high pressure nitrogen, and high pressure nitrogen stability is better, and its elastic buffer ability in compression process is stronger; Simultaneously, in order to adapt to the elastic buffer effect of high pressure nitrogen, active cover 15 adopts the wavy metal pipe arrangement.Himself possesses deformability, can in fixed cover, shrink simultaneously.
Though the above-mentioned accompanying drawing specific embodiments of the invention that combines is described; But be not restriction to protection domain of the present invention; One of ordinary skill in the art should be understood that; On the basis of technological scheme of the present invention, those skilled in the art need not pay various modifications that creative work can make or distortion still in protection scope of the present invention.

Claims (3)

1. a hydraulic jack comprises piston rod, cylinder body, piston, and sell at the bottom of being respectively equipped with preceding pin of oil cylinder and oil cylinder the oil cylinder front and back; Said piston rod is a hollow structure, and its inside is provided with air cavity, and said cylinder interior is provided with oil pocket; Compressed air suits in the air cavity is full of hydraulic oil in the oil pocket, piston is arranged on piston rod inside; Piston is separated air cavity and oil pocket in hydraulic jack inside, is provided with the O RunddichtringO between piston and the piston rod inwall, also is provided with retaining head and connection set between piston rod and the cylinder body; The outside of said cylinder body is provided with fixed cover, and an end of said fixed cover is fixedly connected with cylinder body through fixed block in the position of corresponding connection set, and the other end of said fixed cover links to each other with pin at the bottom of the oil cylinder through fixing device, the inner cavity that forms of said fixed cover; Said piston rod outside is provided with active cover, sells before said active cover one end and the oil cylinder to link to each other, and the other end stretches in the cavity of said fixed cover; Be provided with groove in the cavity of said fixed cover, said active cover connects through the embedding of groove phase in fixed cover; It is characterized in that, be provided with labyrinth channel between said connection set and the inboard wall of cylinder block, be provided with several steel balls in the labyrinth channel to separate hydraulic oil and gas, isolated gas is discharged through gas exhausting device; The outside of said cylinder body also is provided with pressure transducer, to monitor in-oil cylinder pressure.
2. hydraulic jack according to claim 1, said fixed cover and active cover are metal material.
3. according to the described hydraulic jack of claim 1-2, it is characterized in that, be respectively equipped with unidirectional gas charging valve and unidirectional liquid-filling valve to prevent pressurized gas and hydraulic fluid leak at air cavity suction port and oil pocket filler opening.
CN2011104429309A 2011-12-27 2011-12-27 Hydraulic cylinder Pending CN102518618A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011104429309A CN102518618A (en) 2011-12-27 2011-12-27 Hydraulic cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011104429309A CN102518618A (en) 2011-12-27 2011-12-27 Hydraulic cylinder

Publications (1)

Publication Number Publication Date
CN102518618A true CN102518618A (en) 2012-06-27

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Country Link
CN (1) CN102518618A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110030226A (en) * 2019-04-19 2019-07-19 武汉科技大学 A kind of anti-bias load hydraulic cylinder based on heterogeneous frictional interface elastohydrodynamic lubrication performance
CN110050129A (en) * 2016-12-06 2019-07-23 Smc 株式会社 Bar assembly and fluid pressure device
CN110685973A (en) * 2019-08-21 2020-01-14 福建省龙岩液压集团有限公司 Intelligent hydraulic oil cylinder oil leakage monitoring and preventing system
CN111255765A (en) * 2018-11-30 2020-06-09 油顺精密股份有限公司 Oil hydraulic cylinder capable of exhausting and series-connection type synchronous oil hydraulic cylinder system
CN111577700A (en) * 2020-04-03 2020-08-25 武汉船用机械有限责任公司 Sealing device of hydraulic oil cylinder and hydraulic oil cylinder
CN112049833A (en) * 2020-08-21 2020-12-08 浙江永安工程机械有限公司 Novel hydraulic and pneumatic combined control cylinder of hydraulic hammer and sealing form

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2182904Y (en) * 1994-01-17 1994-11-16 颜家生 Gas-liquid type shock-absorber
CN2564627Y (en) * 2002-08-21 2003-08-06 王和 Protective cover for oil tank
CN1834528A (en) * 2006-03-27 2006-09-20 博奥生物有限公司 Flow structure of controlling liquid continuously flowing in micro-pipeline
CN2835699Y (en) * 2004-10-22 2006-11-08 大连万春聚氨酯护舷科技发展有限公司 Hydro-pneumatic buffer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2182904Y (en) * 1994-01-17 1994-11-16 颜家生 Gas-liquid type shock-absorber
CN2564627Y (en) * 2002-08-21 2003-08-06 王和 Protective cover for oil tank
CN2835699Y (en) * 2004-10-22 2006-11-08 大连万春聚氨酯护舷科技发展有限公司 Hydro-pneumatic buffer
CN1834528A (en) * 2006-03-27 2006-09-20 博奥生物有限公司 Flow structure of controlling liquid continuously flowing in micro-pipeline

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110050129A (en) * 2016-12-06 2019-07-23 Smc 株式会社 Bar assembly and fluid pressure device
US11143214B2 (en) 2016-12-06 2021-10-12 Smc Corporation Rod assembly and fluid pressure device
CN111255765A (en) * 2018-11-30 2020-06-09 油顺精密股份有限公司 Oil hydraulic cylinder capable of exhausting and series-connection type synchronous oil hydraulic cylinder system
CN110030226A (en) * 2019-04-19 2019-07-19 武汉科技大学 A kind of anti-bias load hydraulic cylinder based on heterogeneous frictional interface elastohydrodynamic lubrication performance
CN110685973A (en) * 2019-08-21 2020-01-14 福建省龙岩液压集团有限公司 Intelligent hydraulic oil cylinder oil leakage monitoring and preventing system
CN111577700A (en) * 2020-04-03 2020-08-25 武汉船用机械有限责任公司 Sealing device of hydraulic oil cylinder and hydraulic oil cylinder
CN112049833A (en) * 2020-08-21 2020-12-08 浙江永安工程机械有限公司 Novel hydraulic and pneumatic combined control cylinder of hydraulic hammer and sealing form

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Application publication date: 20120627