CN108035935B - Piston buffering pushing device for electro-hydraulic actuator - Google Patents

Piston buffering pushing device for electro-hydraulic actuator Download PDF

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Publication number
CN108035935B
CN108035935B CN201711413210.3A CN201711413210A CN108035935B CN 108035935 B CN108035935 B CN 108035935B CN 201711413210 A CN201711413210 A CN 201711413210A CN 108035935 B CN108035935 B CN 108035935B
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China
Prior art keywords
piston
buffer
buffering
shaft sleeve
sealing seat
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CN201711413210.3A
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Chinese (zh)
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CN108035935A (en
Inventor
曾祥尧
陈江辉
王朝玖
张龙
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China Hangfa Guizhou Red Forest Air Power Control Technology Co Ltd
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China Hangfa Guizhou Red Forest Air Power Control Technology Co Ltd
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Priority to CN201711413210.3A priority Critical patent/CN108035935B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1428Cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/22Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/227Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having an auxiliary cushioning piston within the main piston or the cylinder end face

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention discloses a piston buffering and pushing device for an electro-hydraulic actuating mechanism. The piston type hydraulic cylinder comprises a piston cylinder (1), wherein a sealing seat (2) is arranged at the top of the piston cylinder (1), a buffer mechanism (3) is arranged below the sealing seat (2), and a piston rod (4) capable of moving along the axis direction of the piston cylinder (1) is arranged below the buffer mechanism (3); the buffer mechanism (3) comprises a shaft sleeve (31), the shaft sleeve (31) is fixedly connected with the piston cylinder (1), and a buffer piston (32) is movably connected in the shaft sleeve (31); a flow passage A (21) is arranged on the sealing seat (2), and a flow passage B (321) is arranged on the buffering piston (32); an oil cavity a (5) is arranged between the sealing seat (2) and the buffering piston (32), and an oil cavity c (7) is arranged between the buffering piston (32) and the piston rod (4). The invention has the characteristics of simple structure and prolonged service life.

Description

Piston buffering pushing device for electro-hydraulic actuator
Technical Field
The invention relates to an electro-hydraulic actuating mechanism, in particular to a piston buffering and pushing device for the electro-hydraulic actuating mechanism.
Background
The reciprocating compressor is a positive displacement compressor, and is widely used in oil refining and chemical industries because of its high exhaust pressure and good stability. The nominal displacement of the compressor is essentially constant, but the displacement of the compressor is required to be adjustable within a wide range due to variations in the process flow, the type of raw materials and the market demands. In order to meet the requirement of adjusting the displacement of the compressor, a bypass adjusting method is traditionally adopted. The method has the advantages of simple structure, continuously variable flow, constant pressure ratio of each stage and the like, but the compression work of redundant gas is completely lost, and the returned gas is high-temperature compressed gas and is cooled by cooling water, so the energy consumption is huge and the cost is high, therefore, in view of the above, in order to adapt the exhaust volume of the compressor to the gas consumption, the current adjusting method, namely the top-open air inlet valve adjusting method, gradually becomes a development trend, and the principle is that the compression volume of the gas in each stroke period of a piston is changed by controlling the opening and closing time of an air valve, so that the exhaust volume of the compressor is steplessly adjustable within the range of 0-100%.
However, the main function of the adjusting method is to switch the oil path quickly and transmit the oil pressure to the piston device to push the piston rod to output displacement to realize quick opening and closing of the valve, rigid contact is generated between the pushing of the piston rod and the matching component, no buffering effect is generated, serious damage is caused to the piston and the matching component, and the service life of the valve is influenced.
Disclosure of Invention
The invention aims to provide a piston buffering pushing device for an electro-hydraulic actuator. The invention has the characteristics of simple structure and prolonged service life.
The technical scheme of the invention is as follows: a piston buffering and pushing device for an electro-hydraulic actuator comprises a piston cylinder, wherein a sealing seat is arranged at the top of the piston cylinder, a buffering mechanism is arranged below the sealing seat, and a piston rod capable of moving along the axis direction of the piston cylinder is arranged below the buffering mechanism; the buffer mechanism comprises a shaft sleeve, the shaft sleeve is fixedly connected with the piston cylinder, and a buffer piston is movably connected in the shaft sleeve; the sealing seat is provided with a flow passage A, and the buffer piston is provided with a flow passage B; an oil cavity a is arranged between the sealing seat and the buffering piston, and an oil cavity c is arranged between the buffering piston and the piston rod.
In the piston buffering and pushing device for the electro-hydraulic actuating mechanism, a gasket is further arranged below the buffering piston; an oil cavity b is arranged between the buffer piston and the gasket, and an oil cavity c is arranged between the gasket and the piston rod.
In the piston buffering and pushing device for the electro-hydraulic actuator, the middle part of the flow passage B is provided with a throttling hole.
In the piston buffering and pushing device for the electro-hydraulic actuating mechanism, the shaft sleeve is provided with a steel ball which can move along the direction vertical to the axis of the shaft sleeve, one side of the steel ball is in contact with the side wall of the buffering piston, and the other side of the steel ball is provided with a return spring.
Compared with the prior art, the buffer mechanism is arranged between the sealing seat and the piston rod, the oil cavity a is arranged between the sealing seat and the buffer piston of the buffer mechanism, the oil cavity b is arranged between the buffer piston and the gasket of the buffer mechanism, and the oil cavity c is arranged between the gasket of the buffer mechanism and the piston rod; when the piston rod is pushed, hydraulic oil enters an oil cavity a from the flow passage A (at the moment, the oil cavity a is not filled), a part of hydraulic oil is used for pushing the buffer piston to move along the axis of the shaft sleeve in the oil cavity a, and the other part of hydraulic oil enters the oil cavity c through the flow passage B of the buffer piston to push the piston rod to output; at the moment, because a small amount of hydraulic oil enters the oil cavity c, the extension speed of the piston rod is slow, so that the kinetic energy is small when the piston rod is in rigid contact with a matching part, the impact force of the piston rod on the matching part is reduced, and the service life of the equipment is prolonged; when the oil chamber a is filled with the hydraulic oil, the hydraulic oil entering from the flow passage a completely enters the oil chamber c, and at this time, the piston rod is in contact with the mating member and the hydraulic thrust reaches the maximum, and pushes the mating load.
According to the invention, a gasket is arranged below the buffer piston; an oil cavity b is arranged between the buffer piston and the gasket, and an oil cavity c is arranged between the gasket and the piston rod; when the piston rod returns, the flow passage A is a hydraulic oil outlet, no hydraulic oil enters the whole piston cylinder assembly, and the piston cylinder assembly is only under the action of load counter force; most of the hydraulic oil in the oil cavity c enters the oil cavity b first to push the buffer piston to return reversely, the piston rod subjected to load counterforce slowly returns in the process, the piston rod is prevented from quickly returning under the action of the load counterforce, excessive mechanical damage to the piston rod and the piston cylinder is avoided, and the service life of the device is prolonged.
The middle part of the flow passage B is provided with a throttling hole; the oil pressure of the hydraulic oil flowing through the flow channel B is increased, so that the oil cavity a, the oil cavity B or the oil cavity c can be filled with the hydraulic oil quickly, the two ends of the buffering piston can form oil pressure difference quickly to form buffering, the kinetic energy is prevented from being too large when the piston rod is in rigid contact with a matching part or the piston rod is prevented from being quickly returned to cause mechanical damage under the action of load counter force, and the service life of the device is prolonged.
The invention is provided with a steel ball which can move along the direction vertical to the axis of a shaft sleeve on the shaft sleeve, one side of the steel ball is contacted with the side wall of a buffer piston, and the other side is provided with a return spring; when this structure makes buffer piston move along the axle sleeve axis, need overcome the spacing power between steel ball and return spring, this spacing power can further reduce buffer piston's velocity of motion, and further, kinetic energy when having reduced piston rod and cooperation part rigid contact with prevented that the piston rod from returning fast under load counter-force effect, and then prolonged the life of device.
Therefore, the buffer mechanism is simple in structure, easy to implement and low in cost.
In conclusion, the invention has the characteristics of simple structure and prolonged service life.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The labels in the figures are: the piston-type hydraulic buffer comprises a piston cylinder 1, a sealing seat 2, a flow channel A21, a buffer mechanism 3, a shaft sleeve 31, a buffer piston 32, a flow channel B321, a throttle hole 322, a gasket 33, a piston rod 4, an oil cavity a5, an oil cavity B6, an oil cavity c7, a steel ball 8 and a return spring 9.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Examples are given. A piston buffering pushing device for an electro-hydraulic actuator is shown in figure 1 and comprises a piston cylinder 1, wherein a sealing seat 2 is arranged at the top of the piston cylinder 1, a buffering mechanism 3 is arranged below the sealing seat 2, and a piston rod 4 capable of moving along the axis direction of the piston cylinder 1 is arranged below the buffering mechanism 3; the buffer mechanism 3 comprises a shaft sleeve 31, the shaft sleeve 31 is fixedly connected with the piston cylinder 1, and a buffer piston 32 is movably connected in the shaft sleeve 31; a flow passage A21 is arranged on the sealing seat 2, and a flow passage B321 is arranged on the buffering piston 32; an oil chamber a5 is arranged between the seal seat 2 and the buffer piston 32, and an oil chamber c7 is arranged between the buffer piston 32 and the piston rod 4.
A gasket 33 is arranged below the buffer piston 32; an oil chamber b6 is provided between the cushion piston 32 and the spacer 33, and an oil chamber c7 is provided between the spacer 33 and the piston rod 4.
An orifice 322 is provided in the middle of the flow path B321.
The shaft sleeve 31 is provided with a steel ball 8 capable of moving along the direction vertical to the axis of the shaft sleeve 31, one side of the steel ball 8 is in contact with the side wall of the buffer piston 32, and the other side is provided with a return spring 9.
When the piston rod 4 is pushed, hydraulic oil enters the oil chamber a5 from the flow passage A21 (at this time, the oil chamber a5 is not filled), a part of hydraulic oil is used for pushing the buffer piston 32 to move along the axis of the shaft sleeve 31 in the oil chamber a5 by overcoming the limiting force between the steel ball 8 and the return spring 9, and the other part of hydraulic oil enters the oil chamber c7 through the flow passage B321 of the buffer piston 32 to push the piston rod 4 to output; when the hydraulic oil fills the oil chamber a5, the hydraulic oil introduced from the flow passage a21 entirely enters the oil chamber c7, at which time the piston rod 4 contacts the mating parts and the hydraulic thrust force reaches the maximum, and pushes the mating load.
When the piston rod 4 returns, the flow passage A21 is a hydraulic oil outlet, and the whole piston cylinder assembly including the buffer mechanism has no hydraulic oil entering and is only under the action of load counter force; most of the hydraulic oil in the oil chamber c7 enters the oil chamber b6 to push the buffer piston 32 to reversely return against the limit force between the steel ball 8 and the return spring 9, and the process slowly returns the piston rod 4 subjected to the load counter force.

Claims (2)

1. The utility model provides an electricity liquid is piston buffering thrust unit for actuating mechanism which characterized in that: the piston type hydraulic cylinder comprises a piston cylinder (1), wherein a sealing seat (2) is arranged at the top of the piston cylinder (1), a buffer mechanism (3) is arranged below the sealing seat (2), and a piston rod (4) capable of moving along the axis direction of the piston cylinder (1) is arranged below the buffer mechanism (3); the buffer mechanism (3) comprises a shaft sleeve (31), the shaft sleeve (31) is fixedly connected with the piston cylinder (1), and a buffer piston (32) is movably connected in the shaft sleeve (31); a flow passage A (21) is arranged on the sealing seat (2), and a flow passage B (321) is arranged on the buffering piston (32); an oil cavity a (5) is arranged between the sealing seat (2) and the buffering piston (32), and an oil cavity c (7) is arranged between the buffering piston (32) and the piston rod (4); a gasket (33) is also arranged below the buffer piston (32); an oil cavity b (6) is arranged between the buffer piston (32) and the gasket (33), and an oil cavity c (7) is arranged between the gasket (33) and the piston rod (4); the shaft sleeve (31) is provided with a steel ball (8) which can move along the direction vertical to the axis of the shaft sleeve (31), one side of the steel ball (8) is in contact with the side wall of the buffer piston (32), and the other side of the steel ball (8) is provided with a return spring (9).
2. The piston buffering and pushing device for the electro-hydraulic actuator according to claim 1, characterized in that: and the middle part of the flow passage B (321) is provided with an orifice (322).
CN201711413210.3A 2017-12-24 2017-12-24 Piston buffering pushing device for electro-hydraulic actuator Active CN108035935B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711413210.3A CN108035935B (en) 2017-12-24 2017-12-24 Piston buffering pushing device for electro-hydraulic actuator

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Application Number Priority Date Filing Date Title
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CN108035935A CN108035935A (en) 2018-05-15
CN108035935B true CN108035935B (en) 2020-02-18

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110778490A (en) * 2019-11-11 2020-02-11 无锡康茨压缩机配件与系统有限公司 Stepless air quantity regulating air valve operation method and hydraulic damping device thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204865142U (en) * 2015-07-09 2015-12-16 成都科力夫科技有限公司 Compress tightly filter material's device in pressure filter
CN206144898U (en) * 2016-11-02 2017-05-03 中国石油大学(华东) Novel hydraulic cylinder

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Publication number Priority date Publication date Assignee Title
CN103758814B (en) * 2013-12-31 2015-11-25 中船重工中南装备有限责任公司 A kind of buffering throws venting cylinder
CN204493339U (en) * 2014-08-04 2015-07-22 唐颖达 A kind of range-adjustable buffer plunger double-acting hydraulic cylinder
CN204186689U (en) * 2014-10-14 2015-03-04 湘潭高工科技有限公司 Oil hydraulic cylinder
CN206175383U (en) * 2016-11-08 2017-05-17 河北宣化工程机械股份有限公司 Bull -dozer operating cylinder with buffer function
CN206320117U (en) * 2016-12-29 2017-07-11 赛克思液压科技股份有限公司 A kind of adjustable-pressure level 2 buffering overflow valve
CN206738287U (en) * 2017-03-10 2017-12-12 富泰华工业(深圳)有限公司 Rotary cylinder
CN206682075U (en) * 2017-03-29 2017-11-28 天津鹰格尔液压缸有限公司 A kind of differential hydro cylinder with pooling feature

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204865142U (en) * 2015-07-09 2015-12-16 成都科力夫科技有限公司 Compress tightly filter material's device in pressure filter
CN206144898U (en) * 2016-11-02 2017-05-03 中国石油大学(华东) Novel hydraulic cylinder

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