CN109667809A - A kind of piston type load cylinder with end of travel automatic protection functions - Google Patents

A kind of piston type load cylinder with end of travel automatic protection functions Download PDF

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Publication number
CN109667809A
CN109667809A CN201910011447.1A CN201910011447A CN109667809A CN 109667809 A CN109667809 A CN 109667809A CN 201910011447 A CN201910011447 A CN 201910011447A CN 109667809 A CN109667809 A CN 109667809A
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CN
China
Prior art keywords
piston
cylinder
cylinder body
sealing ring
opening
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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.)
Granted
Application number
CN201910011447.1A
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Chinese (zh)
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CN109667809B (en
Inventor
赵锐
刘欣科
王世超
崔述凯
赵忠辉
王阳阳
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China Coal Research Institute CCRI
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China Coal Research Institute CCRI
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Priority to CN201910011447.1A priority Critical patent/CN109667809B/en
Publication of CN109667809A publication Critical patent/CN109667809A/en
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Classifications

    • 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
    • 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
    • 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
    • F15B15/149Fluid interconnections, e.g. fluid connectors, passages

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

Abstract

The invention discloses a kind of, and the piston type with end of travel automatic protection functions loads cylinder; it is related to hydraulic cylinder technical field; when piston rod movement to end of travel; reaching quickly reduces cylinder interior pressure; make piston rod quick deceleration, and then prevents the dependency structure of piston slap cylinder body and damage load cylinder.The present invention includes cylinder body, piston rod and the piston positioned at described piston rod one end, the first end of the cylinder body seals, second end has opening, the cylinder body is protruded by the opening in one end that the piston is arranged in the piston rod, and the inner wall sealing of the piston and the cylinder body is slidably connected, it is characterized in that, the cylinder body is greater than the internal diameter of other positions close to the internal diameter of the position of the opening, to form unloading-structure in the position close to the opening, when at the piston motion to the unloading-structure, there is gap between the piston and the inboard wall of cylinder block.The present invention is for providing loading force.

Description

A kind of piston type load cylinder with end of travel automatic protection functions
Technical field
The present invention relates to hydraulic cylinder technical field more particularly to a kind of piston types with end of travel automatic protection functions Load cylinder.
Background technique
Hydraulic cylinder refers to converts hydraulic energy to mechanical energy, for driving operating mechanism for linear motion or pendulum motion Device, operation strategies are very extensive.Hydraulic cylinder also divides a variety of forms: piston-type hydraulic cylinder, plunger-type cylinder, telescopic set Cylinder hydraulic cylinder etc..Wherein, piston-type hydraulic cylinder is divided into two kinds of single lever-type, double rod type structures again, by hydraulic coupling operative condition again Divide single-acting formula and double-acting type.
The piston type of the prior art loads cylinder, as shown in Figure 1, including cylinder body 01, piston rod 02 and being located at the piston rod The piston 03 of one end, the opening of cylinder body 01 are provided with guide sleeve 04, and the first hydraulic fluid port 05 and the second hydraulic fluid port 06 are provided on cylinder body 01. Its working principle is that: after injecting highly pressurised liquid by the first hydraulic fluid port 05 inside cylinder body 01, piston rod 02 is open towards cylinder body 01 Position starts high-speed motion.With the reduction of fill cup hydraulic, piston rod 02 loses the active force of highly pressurised liquid and stop motion, but It is since piston rod 02 has motional inertia, piston rod 02 will not stop immediately, and also will continue to movement a distance can just stop.
Especially, when the loading force of piston type load cylinder is larger, the influence of inertia can be bigger.For example, applying to coal mine In mechanical mining technology when the loading experiment of hydraulic support column, since current maximum hydraulic support working resistance has reached 26000000 Ns, bearing height has reached 8800 millimeters, and matched hydraulic support column cylinder diameter has reached 600 millimeters, and right Hydraulic support carries out 2 times of the rated load that load test requires loading force at least to need to reach tested cylinder diameter (that is, loading force At least need to reach 52,000,000 Ns), so, the cylinder diameter of the load cylinder of piston type used in load test then needs to reach 1000 Millimeter or more be just able to satisfy requirement.In this case, since 01 internal pressure of cylinder body is very high, and the cylinder diameter of cylinder is loaded Greatly, stroke is big, this results in the motional inertia of piston rod 02 also very big, so, when the piston rod 02 of piston type load cylinder is transported When moving to end of travel, easily generation piston 03 hits the dependency structure (for example, can be guide sleeve 04) of cylinder body 1 and damages The accident of bad load cylinder.
Summary of the invention
The embodiment of the present invention provides a kind of piston type load cylinder with end of travel automatic protection functions, works as piston rod When moving to end of travel, cylinder interior pressure can be quickly reduced, piston rod quick deceleration is made, and then prevents piston slap cylinder The dependency structure of body and damage load cylinder.
In order to achieve the above objectives, the embodiment provides a kind of pistons with end of travel automatic protection functions Formula loads cylinder, including cylinder body, piston rod and piston positioned at described piston rod one end, the first end sealing of the cylinder body, and second End has opening, and the cylinder body, and the piston and institute are protruded by the opening in one end that the piston is arranged in the piston rod The inner wall sealing for stating cylinder body is slidably connected, which is characterized in that internal diameter of the cylinder body close to the position of the opening is greater than other The internal diameter of position, to form unloading-structure in the position close to the opening, at the piston motion to the unloading-structure When, there is gap between the piston and the inboard wall of cylinder block.
Further, the internal diameter of the cylinder body is gradually increased in the position close to the opening, and the unloading-structure is slope Shape structure.
Further, the opening is equipped with guide sleeve, and the outer wall sealing sliding of the guide sleeve and the piston rod connects It connects, for preventing the piston from skidding off out of described cylinder body, the unloading-structure is located at the of the guide sleeve and the cylinder body Between one end.
Further, it is equipped with the first hydraulic fluid port close to first end on the cylinder body, is equipped with the second hydraulic fluid port close to second end, works as institute When stating at piston motion to the unloading-structure, the opening of second hydraulic fluid port is towards between the guide sleeve and the piston.
Further, the first sealing ring is provided on the guide sleeve, first sealing ring is used for the guide sleeve Outer wall and the piston rod outer wall seal.
Further, the first sealing ring mounting groove is provided on the guide sleeve, first sealing ring is equipped with In first sealing ring mounting groove.
Further, the outer wall of the piston is equipped with the second sealing ring, and second sealing ring is used for the piston The inner wall of outer wall and the cylinder body seals.
Further, the outer wall of the piston offers the second sealing ring mounting groove, and second sealing ring is equipped with In second sealing ring mounting groove.
Piston type provided by the invention with end of travel automatic protection functions loads cylinder, since cylinder body is close to opening The internal diameter of position is greater than the internal diameter of other positions, forms unloading-structure, (that is, piston is transported when at piston motion to unloading-structure Move to end of travel), there is gap, and then the highly pressurised liquid of cylinder interior is made to pass through unloading-structure between piston and inboard wall of cylinder block Discharge in time quickly reduces the internal pressure of cylinder body, reduces piston rod and continues forward power at the end of the stroke, and then makes piston Bar quick deceleration prevents the dependency structure of piston slap cylinder body and damages load cylinder.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is that the piston type of the prior art loads the schematic diagram of the section structure of cylinder;
Fig. 2 is that the cross-section structure of the piston type load cylinder with end of travel automatic protection functions of the embodiment of the present invention shows One of be intended to;
Fig. 3 is that the cross-section structure of the piston type load cylinder with end of travel automatic protection functions of the embodiment of the present invention shows The two of intention;
Fig. 4 is that the piston type with end of travel automatic protection functions of the embodiment of the present invention loads the cross-section structure of cylinder One of partial enlargement diagram;
Fig. 5 is that the piston type with end of travel automatic protection functions of the embodiment of the present invention loads the cross-section structure of cylinder The two of partial enlargement diagram;
Fig. 6 is that the piston type with end of travel automatic protection functions of the embodiment of the present invention loads the unloading-structure of cylinder Section partial enlargement diagram.
Appended drawing reference:
01- cylinder body;02- piston rod;03- piston;04- guide sleeve;The first hydraulic fluid port of 05-;The second hydraulic fluid port of 06-;1- cylinder body; 11- opening;2- piston rod;3- piston;4- unloading-structure;5- guide sleeve;The first hydraulic fluid port of 6-;The second hydraulic fluid port of 7-;8- first is sealed Circle;The second sealing ring of 9-.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " center ", "upper", "lower", "front", "rear", " left side ", The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on the figure Orientation or positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning or Element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected;It is right For those skilled in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply Ground includes one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or It is more than two.
The piston type with end of travel automatic protection functions that the embodiment of the present invention provides loads cylinder, such as Fig. 2 and Fig. 3 Shown, including cylinder body 1, piston rod 2 and piston 3 positioned at 2 one end of piston rod, the first end sealing of cylinder body 1, second end, which has, to be opened Mouth 11, cylinder body 1 is protruded by opening 11 in one end that piston 3 is arranged in piston rod 2, and the sealing of the inner wall of piston 3 and cylinder body 1 is slided and connected It connects, cylinder body 1 is greater than the internal diameter of other positions close to the internal diameter of the position of opening 11, to form off-load in the position close to opening 11 Structure 4 has gap when piston 3 moves at unloading-structure 4 between 1 inner wall of piston 3 and cylinder body.
Piston type provided in an embodiment of the present invention with end of travel automatic protection functions loads cylinder, such as Fig. 2 and Fig. 3 institute Show, the internal diameter due to cylinder body 1 close to the internal diameter of the position of opening 11 greater than other positions, formation unloading-structure 4, when piston 3 is transported When moving to unloading-structure 4 (that is, piston rod 2 moves to end of travel), there is gap between piston 3 and the inner wall of cylinder body 1, into And the highly pressurised liquid inside cylinder body 1 is discharged in time by unloading-structure 4, the internal pressure of cylinder body 1 is quickly reduced, piston is reduced Bar 2 continues forward power at the end of the stroke, and then makes 2 quick deceleration of piston rod, prevents piston 3 from hitting the dependency structure of cylinder body And damage load cylinder.
It should be understood that piston 3 fastly can very much due to speed if being not provided with dependency structure at the opening 11 of cylinder body 1 It flies out and loads the cylinder body 1 of cylinder and cause to load the cylinder damage even injury quality accidents such as personal safety.
Unloading-structure 4 can there are many form, if when piston 3 moves at unloading-structure 4, in piston 3 and cylinder body 1 There is gap between wall, can be realized highly pressurised liquid and be quickly discharged by unloading-structure 4, as shown in Fig. 2, Fig. 4 and Fig. 5, The internal diameter of cylinder body 1 is gradually increased close to the position of opening 11, and unloading-structure 4 is domatic structure.The slope surface of unloading-structure 4 can be with For arc line shaped or linear, when the slope surface of unloading-structure 4 is arc line shaped, highly pressurised liquid is easy the lowest part shape in camber line At vortex, it is unfavorable for highly pressurised liquid and quickly flows discharge, is easy residual highly pressurised liquid.When the slope surface of unloading-structure 4 is linear, Not only contribute to that highly pressurised liquid collects discharge along linear slope surface and linear is more easier to process.
In order to prevent piston 3 from skidding off out of cylinder body 1, as shown in Figures 2 and 3, guide sleeve 5, guide sleeve 5 are equipped at opening 11 Outer wall sealing with piston rod 2 is slidably connected, and between guide sleeve 5 and the first end of cylinder body 1, piston 3 is moving lotus structure 4 When to unloading-structure 4, pass through the pressure in 4 quick release cylinder body 1 of unloading-structure, it is ensured that piston 3 is led in no shock I.e. stop motion before to set 5 damages so that guide sleeve 5 be protected not hit by piston 3, then the entire load cylinder of damage.Guide sleeve 5 High-intensitive material can also be selected with 1 split production of cylinder body, avoids the opening position of entire cylinder body 1 all using high-strength material Material not only ensure that the function of load cylinder but also save cost.And when load cylinder assembling, upper piston rod can be first installed step by step 2 assemble guide sleeve 5 again, facilitate the installation and use of load cylinder.
Wherein, for the ease of to highly pressurised liquid is injected inside cylinder body 1, as shown in Figures 2 and 3, close to first end on cylinder body 1 Equipped with the first hydraulic fluid port 6, the second hydraulic fluid port 7, when piston 3 moves at unloading-structure 4, the second hydraulic fluid port 7 are equipped with close to second end Opening is towards between guide sleeve 5 and piston 3.Illustratively, highly pressurised liquid mentions piston rod 2 into cylinder body 1 by the first hydraulic fluid port 6 For active force, after highly pressurised liquid enters the inside of cylinder body 1, piston rod 2 is in the quickly movement of 1 inside of cylinder body.
It just can guarantee that the function of piston load cylinder is realized due to there was only the inner sealing of cylinder body 1 well.So in order to protect The leakproofness inside cylinder body 1 is demonstrate,proved, as shown in fig. 6, being provided with the first sealing ring 8 on guide sleeve 5, the first sealing ring 8 will be for that will lead The outer wall of outer wall and piston rod 2 to set 5 seals.
Sealing ring 4 can be fixed on guide sleeve 5 by various ways, such as bonding, embedded etc..It is provided on guide sleeve 5 First sealing ring mounting groove, the first sealing ring 8 are equipped in the first sealing ring mounting groove.First sealing ring 8 is using bonding The dual fixed form of embedding dress is equipped in sealing ring mounting groove, more enhance the leakproofness of connection, stability and Safety.
In order to further ensure the leakproofness inside cylinder body 1, as shown in fig. 6, the outer wall of piston 1 is equipped with the second sealing ring 9, Second sealing ring 9 is used to seal the inner wall of the outer wall of piston 3 and cylinder body 1.
Sealing ring 4 can be fixed on guide sleeve 5 by various ways, such as bonding, embedded etc..The outer wall of piston 3 opens up There is the second sealing ring mounting groove, the second sealing ring 9 is equipped in the second sealing ring mounting groove.Second sealing ring 9 is using viscous The dual fixed form for connecing embedding dress is equipped in sealing ring mounting groove, more enhances leakproofness, the stability of connection And safety.
It should be understood that the first sealing ring mounting groove and the second sealing ring mounting groove can be various shapes, illustratively, Sealing ring mounting groove cross sectional shape can be rectangle or semicircle.
It is to a kind of the detailed of piston type load cylinder with end of travel automatic protection functions of the embodiment of the present invention above It is thin to introduce, it is based on this, the piston type load with end of travel automatic protection functions of the embodiment of the present invention is described below The complete operation of cylinder:
Before load, piston rod 2 is withdrawn completely, at this point, load cylinder is standby;
After injecting highly pressurised liquid by the first hydraulic fluid port 6 in cylinder body 1, the highly pressurised liquid in cylinder body 1 immediately produces piston rod 2 Raw active force, quickly loads piston rod 2;
When position high-speed motion to the unloading-structure 4 of the piston 3 of piston rod 2 (that is, piston rod 2 moves to stroke end End), there is gap, and then keep the highly pressurised liquid inside cylinder body 1 timely by unloading-structure 4 between piston 3 and the inner wall of cylinder body 1 Discharge quickly reduces the internal pressure of cylinder body 1, reduces piston rod 2 and continues forward power at the end of the stroke, and then makes piston rod 2 quick decelerations prevent piston 3 from hitting the dependency structure (such as guide sleeve 5) of cylinder body 1 and damaging load cylinder.
Other compositions etc. of piston type load cylinder about the embodiment of the present invention have been well known to those skilled in the art, It is no longer described in detail herein.
The above is only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, any to be familiar with In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those skilled in the art, should all cover Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.

Claims (8)

1. a kind of piston type with end of travel automatic protection functions loads cylinder, including cylinder body, piston rod and it is located at the work The piston of stopper rod one end, the first end sealing of the cylinder body, second end have opening, and the one of the piston is arranged in the piston rod The cylinder body is protruded by the opening in end, and the inner wall sealing of the piston and the cylinder body is slidably connected, which is characterized in that institute The internal diameter that cylinder body is greater than other positions close to the internal diameter of the position of the opening is stated, is unloaded with being formed in the position close to the opening Lotus structure when at the piston motion to the unloading-structure, has gap between the piston and the inboard wall of cylinder block.
2. the piston type according to claim 1 with end of travel automatic protection functions loads cylinder, which is characterized in that institute The internal diameter for stating cylinder body is gradually increased in the position close to the opening, and the unloading-structure is domatic structure.
3. the piston type according to claim 1 or 2 with end of travel automatic protection functions loads cylinder, feature exists In the opening is equipped with guide sleeve, and the outer wall sealing of the guide sleeve and the piston rod is slidably connected, described for preventing Piston is skidded off out of described cylinder body, and the unloading-structure is between the guide sleeve and the first end of the cylinder body.
4. the piston type according to claim 3 with end of travel automatic protection functions loads cylinder, which is characterized in that institute It states and is equipped with the first hydraulic fluid port close to first end on cylinder body, the second hydraulic fluid port is equipped with close to second end, when the piston motion is unloaded to described When at lotus structure, the opening of second hydraulic fluid port is towards between the guide sleeve and the piston.
5. the piston type according to claim 1 with end of travel automatic protection functions loads cylinder, which is characterized in that institute It states and is provided with the first sealing ring on guide sleeve, first sealing ring is used for the outer wall of the guide sleeve and the piston rod Outer wall sealing.
6. the piston type according to claim 5 with end of travel automatic protection functions loads cylinder, which is characterized in that institute It states and is provided with the first sealing ring mounting groove on guide sleeve, first sealing ring is equipped in first sealing ring mounting groove It is interior.
7. the piston type according to claim 1 with end of travel automatic protection functions loads cylinder, which is characterized in that institute The outer wall for stating piston is equipped with the second sealing ring, and second sealing ring is used for the inner wall of the outer wall of the piston and the cylinder body Sealing.
8. the piston type according to claim 7 with end of travel automatic protection functions loads cylinder, which is characterized in that institute The outer wall for stating piston offers the second sealing ring mounting groove, and second sealing ring is equipped in the second sealing ring mounting groove It is interior.
CN201910011447.1A 2019-01-07 2019-01-07 Piston type loading cylinder with stroke end automatic protection function Active CN109667809B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910011447.1A CN109667809B (en) 2019-01-07 2019-01-07 Piston type loading cylinder with stroke end automatic protection function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910011447.1A CN109667809B (en) 2019-01-07 2019-01-07 Piston type loading cylinder with stroke end automatic protection function

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CN109667809B CN109667809B (en) 2020-02-11

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1207132A (en) * 1966-10-21 1970-09-30 Philips Nv Device comprising a piston and cylinder
CN2615406Y (en) * 2003-04-29 2004-05-12 天津特***压股份有限公司 Piston type single-action damper hydraulic cylinder
CN203201900U (en) * 2013-04-18 2013-09-18 湖南华菱湘潭钢铁有限公司 Hydraulic cylinder
CN103851024A (en) * 2012-11-30 2014-06-11 无锡市协新气动有限公司 Groove buffer of hydraulic cylinder
CN105240343A (en) * 2015-11-19 2016-01-13 南京理工大学 Self-buffering-type gas-liquid mixing multi-stage ejection mechanism
CN105370658A (en) * 2015-11-29 2016-03-02 重庆市南川区庆岩福利碱厂 Hydraulic cylinder used for lifting platform in production of caustic soda
CN106545546A (en) * 2017-01-12 2017-03-29 河南平芝高压开关有限公司 Working cylinder with pooling feature and the hydraulic actuating mechanism using the working cylinder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1207132A (en) * 1966-10-21 1970-09-30 Philips Nv Device comprising a piston and cylinder
CN2615406Y (en) * 2003-04-29 2004-05-12 天津特***压股份有限公司 Piston type single-action damper hydraulic cylinder
CN103851024A (en) * 2012-11-30 2014-06-11 无锡市协新气动有限公司 Groove buffer of hydraulic cylinder
CN203201900U (en) * 2013-04-18 2013-09-18 湖南华菱湘潭钢铁有限公司 Hydraulic cylinder
CN105240343A (en) * 2015-11-19 2016-01-13 南京理工大学 Self-buffering-type gas-liquid mixing multi-stage ejection mechanism
CN105370658A (en) * 2015-11-29 2016-03-02 重庆市南川区庆岩福利碱厂 Hydraulic cylinder used for lifting platform in production of caustic soda
CN106545546A (en) * 2017-01-12 2017-03-29 河南平芝高压开关有限公司 Working cylinder with pooling feature and the hydraulic actuating mechanism using the working cylinder

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