CN108533566A - Top movement oil cylinder - Google Patents
Top movement oil cylinder Download PDFInfo
- Publication number
- CN108533566A CN108533566A CN201810665815.XA CN201810665815A CN108533566A CN 108533566 A CN108533566 A CN 108533566A CN 201810665815 A CN201810665815 A CN 201810665815A CN 108533566 A CN108533566 A CN 108533566A
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- cylinder body
- oil
- cylinder
- piston rod
- rod
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
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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 belongs to oil cylinder fields, it is intended to provide a kind of top movement oil cylinder, its key points of the technical solution are that cylinder body and piston rod including relative displacement occurs from each other, the position of movement benchmark of the piston rod as cylinder body, fluid disengaging is located on the central shaft of cylinder body.During oil cylinder use, fluid is exported or is inputted from the center axial position of cylinder body, so the flow velocity of cylinder center position can be slightly faster compared to the flow velocity of cylinder circumference position, the flow velocity at circumferential position each point in cylinder body tends to be equal.When the position of fluid disengaging is located at the central axis of cylinder body, pressure on the circumferential position of cylinder block inner wall at any two points tends to be equal, during piston rod movement, stress tends to be impartial at piston rod circumference, does not easily cause in pushing course that there is a situation where local offsets.
Description
Technical field
The present invention relates to oil cylinder field, more particularly to a kind of top movement oil cylinder.
Background technology
Oil cylinder is common piston arrangement, and relative motion occurs between the piston rod and cylinder body of oil cylinder, is driven and living
The connected componental movement of stopper rod.
Common oil cylinder includes cylinder body and piston rod, and cylinder body is divided into two chambers by piston rod, one of chamber oil inlet,
Another chamber is fuel-displaced, such as a kind of waterproof hydraulic cylinder disclosed in the Chinese patent that publication No. is CN103573742A, including
Inner chamber of cylinder block is divided into two mutual independent parts by cylinder body, piston, piston rod, cylinder cap and pouring orifice, piston rod, cylinder body at two
The oral area of each own disengaging fluid.
The for another example Chinese patent of Publication No. CN1208127A discloses a kind of cylinder system, including oil cylinder and work
Plug, interior fluid used are also to input or export from the chamber of oil cylinder.
It is this that with the conventional oil cylinder that cylinder body is movement benchmark, in use, fluid is mostly to be inputted from cylinder side wall,
Fluid is during input or output, according to Bernoulli equation meaning：In the flowing of fluid, pressure is related to flow velocity, flow velocity
Big local pressure is small, and the small local pressure of flow velocity is big.Therefore at the position of the input of cylinder side wall fluid or output, flow rate of liquid is big
In the oil flow of other positions in cylinder body, therefore other positions in the pressure and cylinder body in cylinder body at close oil inlet and outlet position
There are pressure differences for pressure.
Invention content
The present invention is to provide a kind of top movement oil cylinder, can reduce pressure everywhere in hydraulic cylinder body sidewall circumferential position
Difference.
The present invention above-mentioned technical purpose technical scheme is that：
A kind of top movement oil cylinder, including the cylinder body and piston rod of relative displacement occur from each other, the piston rod is made
Position for the movement benchmark of cylinder body, fluid disengaging is located on the central shaft of cylinder body, and the cylinder body is divided into adjacent oil suction chamber
And oil outlet chamber, the fluid in the oil suction chamber and oil outlet chamber flow through path and pass through piston rod.
By using above-mentioned technical proposal, during oil cylinder use, fluid from the center axial position of cylinder body export or
Input, so the flow velocity of cylinder center position can be slightly faster compared to the flow velocity of cylinder circumference position, the circumference position in cylinder body
It sets the flow velocity at each point and tends to be equal.According to Bernoulli equation：
p+1/2ρv2+ ρ gh=C (formula 1)
p1+1/2ρv1 2+ρgh1=p2+1/2ρv2 2+ρgh2(formula 2)
In above-mentioned formula：P is the pressure that certain in fluid is put, and v is the flow velocity of the fluid point, and ρ is fluid density, and g adds for gravity
Speed, h are height where the point, and C is a constant.
From formula 1：In cylinder body inner periphery position, v is regarded as steady state value equal everywhere, and ρ, g are steady state value, and h values are drafted
Relative altitude between oil cylinder and ground, i.e. h are also regarded as steady state value, then pressure p can be regarded as remaining unchanged；
From formula 2：If the piston rod of cylinder body is horizontal positioned, arbitrary two at inner chamber of cylinder block one on circumferential position are taken
When point, 2 points of vertical height h is different, and v is regarded as steady state value equal everywhere, and ρ, g are steady state value, therefore p1、p2Difference and h
Difference in height is related, but due to the difference in height very little of h, therefore p1、p2Between deviation be only to fall within limits；If h values are intended
The relative altitude being set between oil cylinder and ground is a steady state value, then p1、p2Also it is equivalence.
And compared to for different 2 points of circumferential position speed, p value and v2Correlation, by flow velocity v with square calculating
In mode built-in type, by v1And v2Difference exponentially amplify again, difference is apparent.
Can to sum up obtain, when the circumferential position for being located at cylinder body into out position of fluid, i.e., conventional oil cylinder into oil outlet structure work
Under condition, the pressure difference of inner chamber of cylinder block circumferential location is big, is mutually contradicted between piston rod and fluid and relative displacement occurs
When, it is easy to make the stress on piston rod end at any two points to differ, influences the promotion of piston rod；
When the position of fluid disengaging is located at the central axis of cylinder body, any two points on the circumferential position of cylinder block inner wall
The pressure at place tends to be equal, and during piston rod movement, stress tends to be impartial at piston rod circumference, does not easily cause and pushed
There is a situation where local offsets in journey.
Meanwhile piston rod is located at the cental axial position of cylinder body, fluid flows through path by piston rod, can not increase portion
Under the premise of part, the path that flows through of fluid is changed to by cylinder side wall among cylinder body.
Further setting：The piston rod includes the cock body that relative motion occurs between cylinder body, is coaxially disposed with cock body
The body of rod, oil circuit is offered in the piston rod, the oil circuit at least one runs through cock body.
By using above-mentioned technical proposal, cock body both sides are respectively oil suction chamber and oil outlet chamber, when wherein an oil circuit runs through
After cock body, just with oil suction chamber or oil outlet chamber are one of is connected to, not through the oil circuit just oil pocket with the other side of cock body of cock body
It is connected, achievees the purpose that pass in and out fluid.
Further setting：One end of all oil circuits and the body of rod be connected tos away from one end of cylinder body, the other end of the oil circuit and
Oil suction chamber or oil outlet chamber are connected.
By using above-mentioned technical proposal, oil circuit is arranged in piston rod, and at least needs that two oil circuits are arranged, then oily
The cross section on road is necessarily small.The formula of seeking of the size of mean velocity in section is：
V=Q/A
Wherein, Q is the flow by the section, and A is cross-sectional area；
In this formula, perpendicular to the cross-section of river, when Q is constant, A is smaller, and v is bigger, it is known that is applied to actual condition in the directions v
In, pipeline is thinner, and fluid flow rate is bigger in pipe；
According to Reynolds number calculation formula：
Re=ρ vd/ η
In this formula, v, ρ, η are respectively flow velocity, density and the viscosity coefficient of fluid, wherein density is constant with viscosity coefficient
Value, d is a characteristic length, in this operating mode, enables d refer to oil circuit diameter, in same operating, d is remained unchanged.
This formula, which is substituted into v transformation, to be obtained：
Re=4 ρ Q/ π d η
So when flow velocity is bigger, Reynolds number is bigger, and the influence of inertia stream field at this time is more than viscous force, and fluid flows not
Stablize, the minor change of flow velocity is easy development, enhancing, forms disorderly, irregular turbulence flow flied.And in this operating mode, A is kept not
Become (A is (0.5d) 2 π), be a value more smaller than conventional oil inlet end face, so flowing out fluid in smaller sectional area
When, flow Q will tail off in the unit interval, i.e. Q is influenced by the sectional area metering function of A and become smaller, therefore v becomes smaller, and Re becomes smaller, and glue
The influence of stagnant power stream field is more than inertia, in flow field the disturbance of flow velocity can decay because of viscous force, fluid stream dynamic stability, in cylinder body
In fluid flowing when, be not easy because fluid flow it is chaotic due to influence the normal axial of piston rod and push.
Further setting：The oil circuit draws one end of the body of rod and rod end is tightly connected, the oil circuit the body of rod it
Outer part is mutual indepedent.
By using above-mentioned technical proposal, in fluid flow process, the fluid in two pipelines is not easy to influence each other, and two
Pressure in oil circuit is not easy to influence between each other.
Further setting：The rod end is equipped with the limited block remained unchanged with ground relative position, the limited block
It is sheathed on the body of rod.
By using above-mentioned technical proposal, limited block defines the relative position of the body of rod so that the body of rod is kept fixed constant
Position, so that during movement of cylinder block, the deviation of movement of cylinder block distance can be reduced.
Further setting：The cylinder base be equipped with convenient for cylinder body sliding pedestal, the pedestal include be vertically arranged and
With by the perforative limiting plate of the body of rod, the limited block is fixed on the side that limiting plate deviates from cylinder body.
By using above-mentioned technical proposal, while pedestal plays a supporting role to cylinder body, also as the movement base of cylinder body
It is accurate.It is bigger to move base volume, is less susceptible to that play occurs, the movement travel of cylinder body controls more accurate.
Further setting：Sliding rail is additionally provided on the pedestal, the cylinder body is fallen on sliding rail, the cylinder body and piston rod
Between occur relative displacement motion path be sliding rail profile move towards.
By using above-mentioned technical proposal, sliding rail can reduce cylinder body generated frictional resistance during the motion, cylinder
Frictional resistance on body is smaller, and during the motion, the load being applied on cylinder body or piston rod accordingly can be smaller, is convenient for cylinder
Body moves, and prolongs the service life.
Further setting：The oil circuit stretches out the end of limited block laid out in parallel in the horizontal plane.
By using above-mentioned technical proposal, if vertical arrangement, then the vertical distance between the end of two oil circuits is than horizontal
It apart from bigger between the both ends of arrangement, when fluid is entered in cylinder body, is flowed out from same vertical height, convenient for simultaneously filling fluid
Enter cylinder body or extraction cylinder body.
Preferably, the cylinder body is coated with shell, the side of the cylinder body setting piston rod is stretched out except shell.
By using above-mentioned technical proposal, during cylinder body is moved to limiting plate, if cylinder body will contradict limiting plate
Place, then remain a distance, which is at least the axial length of cylinder body extension between shell and limiting plate.Such as
This is not easy to impact shell, makes shell not easy damaged when cylinder body and limiting plate contradict.
In conclusion the invention has the advantages that：
1, when the pressure distribution that fluid is when flowing through path as by piston rod, and flowing of the fluid in cylinder body shows
For：Pressure on the circumferential position of cylinder block inner wall at any two points tends to be equal, and stress tends to be impartial at piston rod circumference,
The case where cock body circumference of piston rod is not susceptible to local offset；
2, when conventional cylinder efficient, cylinder body is movement benchmark, and piston rod is moving component, and driven member is driven by piston rod
Movement, and the self-strength of cylinder body is more than the self-strength of piston rod, therefore use cylinder body that can drive bigger as moving component
Load；
3, pedestal integrally plays the role of limit and support to oil cylinder, and when cylinder body needs movement, sliding rail can have
Effect reduces the resistance that cylinder body axially moves；Improve the efficiency that cylinder body is axially moved.
Description of the drawings
Fig. 1 is the overall structure diagram for embodying top movement oil cylinder in embodiment 1；
Fig. 2 is the cylinder body cross-sectional view for embodying top movement oil cylinder in embodiment 1.
In figure, 1, cylinder body；2, piston rod；21, cock body；22, the body of rod；3, oil suction chamber；4, oil outlet chamber；5, oil circuit；6, it limits
Block；7, pedestal；8, limiting plate；9, sliding rail；10, shell；11, linear bearing.
Specific implementation mode
Below in conjunction with attached drawing, invention is further described in detail.
Embodiment 1：A kind of top movement oil cylinder is used for the top promotion of horizontal machine tool, as shown in Figure 1, include cylinder body 1,
Cylinder body 1 is horizontal positioned, and piston rod 2 is drawn in side, and piston rod 2 includes introducing one end connection of cylinder body 1 and being sent out between cylinder body 1
The cock body 21 of raw relative motion, the body of rod 22 being coaxially connected with cock body 21.
In use, piston rod 2 and the relative position on ground remain stationary as this top movement oil cylinder, cylinder body 1 with
The relative position on ground changes.
For limiting piston bar 2, it is additionally provided with rack, rack includes pedestal 7 and limiting plate 8.Pedestal 7 and limiting plate 8 are equal
It is made of thermosetting resin-impregnated paper high-pressure laminated board, this material has preferable resistance to punching from heavy and light, and in actual production
Power and heat resistance are hit, the top load operating mode of lathe is suitable for.
Pedestal 7 is horizontal positioned, is in cube shaped, sets the centre position of pedestal 7 to engraved structure, and use and set vertically
The floor and support column set are as the measure for improving intensity.
Limiting plate 8 is attached at the side of pedestal 7, and the relationship that contacts between the body of rod 22 and limiting plate 8 is connected.Limiting plate 8
It is arranged in a mutually vertical manner between pedestal 7, the body of rod 22 runs through limiting plate 8, and cylinder body 1 is fallen on pedestal 7.
One end that the body of rod 22 stretches out limiting plate 8 is away from one end of cylinder body 1, which is provided with limited block 6, limited block 6
It is connected with limiting plate 8.Limited block 6 is provided in round, and is tightly attached to limiting plate 8 and is deviated from 1 side of cylinder body, and the top of limited block 6 is set
Be set to flushed with the top of limiting plate 8 it is linear.
Sliding rail 9 is provided on pedestal 7, cylinder body 1 is fallen on the sliding rail 9 of pedestal 7, is arranged between 1 bottom of cylinder body and sliding rail 9
Linear bearing 11, so that relative displacement occurs between cylinder body 1 and pedestal 7.The motion path of displacement is the profile of sliding rail 9, sliding rail 9
It is set as the linear type parallel with piston rod 2.
Shell 10 is additionally provided with outside cylinder body 1,10 cross section of shell of 1 outer cladding of cylinder body is in pentagon, and bottom edge level is set
It sets, linear bearing 11 and shell 10 parallel with pedestal 7, wherein one of top margin is flat with the chamfering of the homonymy at 8 top of limiting plate
Row.The grating texture of heat dissipation is equipped with away from ground side in shell 10.
The inner cavity of cylinder body 1 is divided into oil suction chamber 3 and oil outlet chamber 4, and oil suction chamber 3, the separation of oil outlet chamber 4 are real by piston rod 2
Existing, the cock body 21 of piston rod 2 contacts at 1 inner cavity of cylinder body, 1 inner cavity of cylinder body is divided into two parts, as shown in Fig. 2, oil suction chamber 3 is in cylinder
Body 1 deviates from the side that piston rod 2 stretches out, and oil outlet chamber 4 is located at cylinder body 1 close to the side that piston rod 2 stretches out.
Piston rod 2 is got through, and two oil circuits 5 are arranged in the body of rod 22, wherein an oil circuit 5 runs through cock body 21, another
Oil circuit 5 before being connected to cock body 21 just draw the body of rod 22 outside so that two oil circuits 5 respectively with 4 phase of oil suction chamber 3 and oil outlet chamber
Even.It is located at due to piston rod 2 on the central shaft of cylinder body 1, therefore the position of fluid disengaging is located in the central axis of cylinder body 1, and make
It obtains the fluid in oil suction chamber 3 and oil outlet chamber 4 and flows through path by piston rod 2.
Oil circuit 5 extends to the end of the body of rod 22 away from one end of cock body 21, and 22 end of the body of rod is got through, so as to oil circuit 5
It is connected with extraneous oil pipe or oil pump.
There are oil pipe, two oil circuits 5 to be arranged side by side in the horizontal plane in the end airtight connection that oil circuit 5 draws the body of rod 22, oil
It is closed using adhesive plaster or glue the junction of pipe and oil circuit 5.The oil pipe that two oil circuits, 5, two oil circuits 5 are drawn is mutually solely
It erects and sets so that fluid is not easy fluid flowing in by adjacent oil circuit 5 or oil pipe in flow process to be influenced.
It is top to be connected with cylinder body 1 when using the oil cylinder, wherein 5 oil inlet of oil circuit, such as fluid is inputted into oil suction chamber 3
Interior, oil outlet chamber 4 is fuel-displaced at this time, and cylinder body 1 moves along a straight line, and drives top movement；By into fuel-displaced setting, adjusting cylinder body 1
Forward or backward.
Embodiment 2：A kind of top movement oil cylinder, difference from example 1 is that, at the sliding rail 9 in embodiment 1
Linear bearing 11, does not use in the present embodiment, but 10 bottom of shell is provided with the metal covering being affixed with sliding rail 9, metal
The face that face and sliding rail 9 are affixed is disposed as plane, and surface roughness is disposed as Ra0.2 so that cylinder body 1 is during the motion
Stable relative displacement can occur with sliding rail 9.
The above embodiments are only explanation of the invention, are not limitation of the present invention, people in the art
Member can as needed make the present embodiment the modification of not creative contribution after reading this specification, but as long as at this
It is all protected by Patent Law in the right of invention.
Claims (9)
1. a kind of top movement oil cylinder, including the cylinder body of relative displacement occurs from each other（1）And piston rod（2）, it is characterized in that：
The piston rod（2）As cylinder body（1）Movement benchmark, fluid disengaging position be located at cylinder body（1）Central shaft on, the cylinder
Body（1）It is divided into adjacent oil suction chamber（3）And oil outlet chamber（4）, the oil suction chamber（3）And oil outlet chamber（4）Interior fluid flows through road
Diameter passes through piston rod（2）.
2. top movement oil cylinder according to claim 1, it is characterized in that：The piston rod（2）Including with cylinder body（1）Between
The cock body of relative motion occurs（21）With cock body（21）The body of rod of coaxial arrangement（22）, the piston rod（2）Inside offer oil circuit
（5）, the oil circuit（5）At least one runs through cock body（21）.
3. top movement oil cylinder according to claim 2, it is characterized in that：All oil circuits（5）One end and the body of rod（22）The back of the body
From cylinder body（1）One end connection, the oil circuit（5）The other end and oil suction chamber（3）Or oil outlet chamber（4）It is connected.
4. top movement oil cylinder according to claim 2, it is characterized in that：The oil circuit（5）Draw the body of rod（22）One end
With the body of rod（22）End part seal connects, the oil circuit（5）In the body of rod（22）Except part it is mutual indepedent.
5. top movement oil cylinder according to claim 2, it is characterized in that：The body of rod（22）End is equipped with opposite with ground
The limited block that position remains unchanged（6）, the limited block（6）It is sheathed on the body of rod（22）On.
6. top movement oil cylinder according to claim 5, it is characterized in that：The cylinder body（1）Bottom, which is equipped with, is convenient for cylinder body（1）
The pedestal of sliding（7）, the pedestal（7）Including be vertically arranged and with by the body of rod（22）Perforative limiting plate（8）, the limited block
（6）It is fixed on limiting plate（8）Away from cylinder body（1）Side.
7. top movement oil cylinder according to claim 5, it is characterized in that：The pedestal（7）On be additionally provided with sliding rail（9）,
The cylinder body（1）It falls in sliding rail（9）On, the cylinder body（1）With piston rod（2）Between occur relative displacement motion path be slide
Rail（9）Profile trend.
8. top movement oil cylinder according to claim 5, it is characterized in that：The oil circuit（5）Stretch out limited block（6）End
Laid out in parallel in the horizontal plane.
9. top movement oil cylinder according to claim 1, it is characterized in that：The cylinder body（1）It is coated with shell（10）, institute
State cylinder body（1）Piston rod is set（2）Side stretch out shell（10）Except.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810665815.XA CN108533566A (en) | 2018-06-23 | 2018-06-23 | Top movement oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810665815.XA CN108533566A (en) | 2018-06-23 | 2018-06-23 | Top movement oil cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108533566A true CN108533566A (en) | 2018-09-14 |
Family
ID=63486999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810665815.XA Pending CN108533566A (en) | 2018-06-23 | 2018-06-23 | Top movement oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108533566A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1124100A (en) * | 1963-11-13 | 1968-08-21 | Armand Profit | Lathes |
| DE2545740A1 (en) * | 1975-10-11 | 1977-04-21 | Otto Griesser | Pneumatic slide drive with oil damping - has damping characteristics of air chambers kept constant using oil chamber reservoirs |
| EP0134398A1 (en) * | 1983-08-27 | 1985-03-20 | Franco Toss | Modular piston-driven Actuator |
| CN102705291A (en) * | 2012-05-28 | 2012-10-03 | 湘煤立达矿山装备股份有限公司 | Oil cylinder capable of passing oil by piston rod |
| CN202668109U (en) * | 2012-06-04 | 2013-01-16 | 天门双菱百变钢构有限责任公司 | Cylinder barrel hydraulic sensing clamping device |
| CN105500081B (en) * | 2016-01-29 | 2017-11-17 | 合肥压力机械有限责任公司 | The self-centering clamping device of axle pipe part |
-
2018
- 2018-06-23 CN CN201810665815.XA patent/CN108533566A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1124100A (en) * | 1963-11-13 | 1968-08-21 | Armand Profit | Lathes |
| DE2545740A1 (en) * | 1975-10-11 | 1977-04-21 | Otto Griesser | Pneumatic slide drive with oil damping - has damping characteristics of air chambers kept constant using oil chamber reservoirs |
| EP0134398A1 (en) * | 1983-08-27 | 1985-03-20 | Franco Toss | Modular piston-driven Actuator |
| CN102705291A (en) * | 2012-05-28 | 2012-10-03 | 湘煤立达矿山装备股份有限公司 | Oil cylinder capable of passing oil by piston rod |
| CN202668109U (en) * | 2012-06-04 | 2013-01-16 | 天门双菱百变钢构有限责任公司 | Cylinder barrel hydraulic sensing clamping device |
| CN105500081B (en) * | 2016-01-29 | 2017-11-17 | 合肥压力机械有限责任公司 | The self-centering clamping device of axle pipe part |
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Application publication date: 20180914 |
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