CN107477036B - The hydraulic control system of telescoping mechanism and vehicle with it - Google Patents
The hydraulic control system of telescoping mechanism and vehicle with it Download PDFInfo
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- CN107477036B CN107477036B CN201710683338.5A CN201710683338A CN107477036B CN 107477036 B CN107477036 B CN 107477036B CN 201710683338 A CN201710683338 A CN 201710683338A CN 107477036 B CN107477036 B CN 107477036B
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- cavity
- oil
- hydraulic fluid
- fluid port
- hydraulic
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Classifications
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
- B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/001—Servomotor systems with fluidic control
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention provides a kind of hydraulic control system of telescoping mechanism and with its vehicle.Wherein, hydraulic control system includes: the first oil cylinder, including the first cylinder body and setting in the intracorporal first piston of the first cylinder, and the inner cavity of the first cylinder body is divided into the first cavity and the second cavity by first piston；Second oil cylinder, including the second cylinder body and setting, in the intracorporal second piston of the second cylinder, the inner cavity of the second cylinder body is divided into third cavity and the 4th cavity by second piston, and the 4th cavity is connected to the second cavity；Wherein, it is connected to third cavity so that the extension end of the second oil cylinder can be stretched out or retract by the first cavity of control.The present invention can solve the problem of cylinder structure complexity in the prior art.
Description
Technical field
The present invention relates to technical field of vehicle, a kind of hydraulic control system in particular to telescoping mechanism and have
Its vehicle.
Background technique
Lifting vehicle generally uses hydraulic control system to drive crane arm, to realize the flexible of crane arm.
In the prior art, hydraulic control system includes two oil cylinders, and there is bar at the both ends of fuel feeding access with first oil cylinder
Chamber and rodless cavity are respectively communicated with.Wherein, in first oil cylinder be equipped with through cylinder body and piston rod built-in core pipe, built-in core pipe with
The rod chamber of first oil cylinder is not connected to rodless cavity, and the built-in core pipe of the rodless cavity of second oil cylinder and first oil cylinder connects
It passes to and realizes the flexible of second oil cylinder.Cylinder structure equipped with built-in core pipe is complicated, is easy to appear failure.
Summary of the invention
The main purpose of the present invention is to provide a kind of hydraulic control system of telescoping mechanism and with its vehicle, with solution
The certainly problem of cylinder structure complexity in the prior art.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of hydraulic control system of telescoping mechanism
System, hydraulic control system include: the first oil cylinder, including the first cylinder body and setting are lived in the intracorporal first piston of the first cylinder, first
The inner cavity of first cylinder body is divided into the first cavity and the second cavity by plug；Second oil cylinder, including the second cylinder body and setting are second
The inner cavity of second cylinder body is divided into third cavity and the 4th cavity by the intracorporal second piston of cylinder, second piston, the 4th cavity with
The connection of second cavity；Wherein, it is connected to third cavity so that the extension end of the second oil cylinder can be stretched out by the first cavity of control
Or it retracts.
Further, hydraulic control system further include: fuel feeding access, the first end of fuel feeding access are connected to the first cavity,
The second end of fuel feeding access is connected to the second cavity；Control device controls the first cavity by control device and third cavity connects
On-off is opened.
Further, the first oil cylinder further includes the first hydraulic fluid port a being arranged on the first cylinder body, when the extension end of the first oil cylinder
When reaching first position, the first hydraulic fluid port a is connected to the first cavity, and control device controls the first hydraulic fluid port a and is connected to third cavity,
So that the first cavity is connected to third cavity, the extension end of the second oil cylinder can be stretched out, when the extension end of the first oil cylinder leaves
When one position, the first cavity and the first hydraulic fluid port a are disconnected, and control device controls the first hydraulic fluid port a and third cavity disconnects so that second
The extension end of oil cylinder is static.
Further, the first oil cylinder further include: the first oil duct penetrates through first body of rod of first piston and connects with first body of rod
The first piston head connect, one end of the first oil duct are connected to the first cavity, the other end of the first oil duct and the first of fuel feeding access
End connection；Second oil duct is arranged on first body of rod and is isolated with the first oil duct, and one end of the second oil duct and the second cavity connect
Logical, one end of the second oil duct is connected to the second end of fuel feeding access；Third oil duct is arranged on first piston head, third oil duct
It is connected to the first oil duct and is isolated with the second oil duct, when the extension end of the first oil cylinder reaches first position, third oil duct
Corresponding with the position of the first hydraulic fluid port a and be connected to, the first cavity is connected to by third oil duct with the first hydraulic fluid port a, when the first oil cylinder
When first position is left in extension end, third oil duct and the position of the first hydraulic fluid port a are staggered, and the first cavity is not connected to the first hydraulic fluid port a.
Further, the second oil cylinder further includes that second for penetrating through second body of rod of second piston and connecting with second body of rod lives
4th oil duct of chock plug, the 4th oil duct are connected to third cavity, and hydraulic control system further includes for connecting the first hydraulic fluid port a and the
First pipeline of four oil ducts, control device include being arranged on the first pipeline for controlling the first switch of the on-off of the first pipeline
Valve, there are two the first actuator port, the first control port and the second control port, two the first working oils for first switch valve tool
With the first piping connection, the first control port is connected to mouth with the first hydraulic fluid port a, and the second control port is connected to the second cavity, logical
It crosses the first control port and the second control port control first switch valve is cut between the first operating position and the second operating position
It changes, when the extension end of the first oil cylinder reaches first position, first switch valve is in the second operating position, two first work
Hydraulic fluid port connection, when first position is left in the extension end of the first oil cylinder, first switch valve is in the first operating position, and two first
Actuator port disconnects.
Further, the first oil cylinder further includes the second the hydraulic fluid port b, the second hydraulic fluid port b and the first chamber being arranged on the first cylinder body
Body connection, when the extension end of the first oil cylinder is retracted into the second position, the second hydraulic fluid port b is connected to the first cavity, control device control
It makes the second hydraulic fluid port b to be connected to third cavity, so that the first cavity is connected to third cavity, the extension end of the second oil cylinder can contract
It returns, when the second position is left in the extension end of the first oil cylinder, the second hydraulic fluid port b and third cavity are disconnected, control device control second
Hydraulic fluid port b and third cavity disconnect, so that the extension end of the second oil cylinder is static.
Further, the second oil cylinder further includes the 4th oil duct being arranged in second piston, the 4th oil duct and third cavity
Connection, hydraulic control system further includes the second pipeline for connecting the second hydraulic fluid port b and the 4th oil duct, and control device further includes setting
It sets for controlling the second switch valve of the on-off of the second pipeline on the second pipeline, when the extension end of the first oil cylinder is retracted into the
When two positions, second switch valve controls the second pipeline connection, when the second position is left in the extension end of the first oil cylinder, second switch
Valve controls the second pipeline and disconnects.
Further, the first oil cylinder further includes the third hydraulic fluid port c being arranged on the first cylinder body, and there are two second switch valve tools
Second actuator port, third control port and the 4th control port, second switch valve, which has, keeps two the second actuator ports disconnected
The third operating position opened and the 4th operating position for being connected to two the second actuator ports, two the second actuator ports are with
Two piping connections, third control port are connected to the second hydraulic fluid port b, and the 4th control port is connected to third hydraulic fluid port c, and the first oil cylinder is also
Including the 5th oil duct being arranged on the first piston head of first piston, the 5th oil duct is connected to the second cavity, when the first oil cylinder
Extension end when being retracted into the second position, the 5th oil duct is corresponding with the position of third hydraulic fluid port c and is connected to, and third hydraulic fluid port c passes through the
Five oil ducts are connected to the second cavity, and second switch valve is in third operating position, when second is left in the extension end of the first oil cylinder
When setting, the position of the 5th oil duct and third hydraulic fluid port c is staggered, and the second cavity is not connected to third hydraulic fluid port c, and second switch valve is in the
Four operating positions.
Further, hydraulic control system further includes the reversal valve being arranged on fuel feeding access and connect with reversal valve
There is the 5th hydraulic fluid port j and the 6th hydraulic fluid port k, the 5th hydraulic fluid port j to be connected to the first cavity for oil pump, reversal valve, the 6th hydraulic fluid port k and the second chamber
Body connection, reversal valve has first state and the second state, and when reversal valve is in first state, the 5th hydraulic fluid port j and oil pump connect
It is logical, and the 6th hydraulic fluid port k is connected to fuel reserve tank, hydraulic oil enters the first cavity from the 5th hydraulic fluid port j, and the hydraulic oil in the second cavity is logical
It crosses the 6th hydraulic fluid port k and is back to fuel reserve tank, so that the first oil cylinder stretches out；When reversal valve is in the second state, the 6th hydraulic fluid port k and oil
Pump connection, and the 5th hydraulic fluid port j is connected to fuel reserve tank, hydraulic oil enters the second cavity from the 6th hydraulic fluid port k, hydraulic in the first cavity
Oil is back to fuel reserve tank by the 5th hydraulic fluid port j, so that the first oil cylinder retracts.
According to another aspect of the present invention, a kind of vehicle is provided, is connect including stretching structure and with stretching structure
Hydraulic control system, hydraulic control system are hydraulic control system above-mentioned.
It applies the technical scheme of the present invention, the connected state for controlling third cavity and the first cavity can just make the first cavity
It is connected to third cavity with the fuel feeding access of hydraulic control system, so that the extension end of the second oil cylinder can be stretched out or retract,
Third cavity is connected to fuel feeding access it is not necessary that core pipe is arranged on the first oil cylinder, the structure of oil cylinder is simplified, avoids oil cylinder
It breaks down.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram (stretching of the first oil cylinder of the embodiment of hydraulic control system according to the present invention
End and the extension end of the second oil cylinder are in retracted mode)；
Fig. 2 shows the structural schematic diagram of the hydraulic control system of Fig. 1, (extension end of the first oil cylinder reaches first
It sets, the extension end of the second oil cylinder is in retracted mode)；
Fig. 3 shows the structural schematic diagram of the hydraulic control system of Fig. 1, and (extension end of the first oil cylinder reaches first
It sets, process is stretched out in the extension end of the second oil cylinder)；
Fig. 4 show the hydraulic control system of Fig. 1 structural schematic diagram (extension end of the first oil cylinder contracting retracts process, the
The extension end of two oil cylinders is in stretching state)；And
Fig. 5 shows the structural schematic diagram of the hydraulic control system of Fig. 1, and (extension end of the first oil cylinder is retracted into second
It sets, the extension end of the second oil cylinder retracts process).
Wherein, the above drawings include the following reference numerals:
10, the first oil cylinder；11, the first cylinder body；12, first piston；13, the first cavity；14, the second cavity；121, first
Oil duct；122, the second oil duct；123, third oil duct；124, the 5th oil duct；20, the second oil cylinder；21, the second cylinder body；22, second is living
Plug；23, third cavity；24, the 4th cavity；221, the 4th oil duct；222, the 6th oil duct；30, the first pipeline；31, first switch
Valve；40, the second pipeline；41, second switch valve；50, third pipeline；60, oil pump；70, reversal valve；80, the 4th pipeline；81, it puts down
Weigh valve；90, the 5th pipeline.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
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.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each portion shown in attached drawing
The size divided not is to draw according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant
Method and equipment may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as authorizing explanation
A part of book.In shown here and discussion all examples, any occurrence should be construed as merely illustratively, and
Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar label
Similar terms are indicated in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached
It does not need that it is further discussed in figure.
In the description of the present invention, it is to be understood that, the noun of locality such as " front, rear, top, and bottom, left and right ", " it is laterally, vertical,
Vertically, orientation or positional relationship indicated by level " and " top, bottom " etc. is normally based on orientation or position shown in the drawings and closes
System, is merely for convenience of description of the present invention and simplification of the description, in the absence of explanation to the contrary, these nouns of locality do not indicate that
It must have a particular orientation or be constructed and operated in a specific orientation with the device or element for implying signified, therefore cannot manage
Solution is limiting the scope of the invention；The noun of locality " inside and outside " refers to inside and outside the profile relative to each component itself.
The present invention provides a kind of hydraulic control system of telescoping mechanism and with its vehicle.In the present invention and the present invention
Embodiment in, hydraulic control is for driving telescoping mechanism to move.
In of the invention and the embodiment of the present invention, vehicle includes stretching structure and the hydraulic control system connecting with stretching structure
System.
In of the invention and the embodiment of the present invention, in order to solve the problems, such as that cylinder structure is complicated in the prior art, to hydraulic
The structure of control system is improved, specifically described below:
As shown in Figures 1 to 5, in an embodiment of the present invention, hydraulic control system includes the first oil cylinder 10 and the second oil
Cylinder 20.It cylinder body 11 and the first piston 12 that is arranged in the first cylinder body 11 that first oil cylinder 10, which includes first, and first piston 12 is by the
The inner cavity of one cylinder body 11 is divided into the first cavity 13 and the second cavity 14.Second oil cylinder 20 includes the second cylinder body 21 and setting the
The inner cavity of second cylinder body 21 is divided into third cavity 23 and the 4th cavity by the second piston 22 in two cylinder bodies 21, second piston 22
24, the 4th cavity 24 is connected to the second cavity 14.Wherein, it is connected to third cavity 23 so that second by the first cavity 13 of control
The extension end of oil cylinder 20 can be stretched out or retract.
By above-mentioned setting, the first cavity 13 and third chamber can just be made by controlling third cavity 23 and being connected to the first cavity 13
Body 23 is connected to the fuel feeding access of hydraulic control system, it is not necessary that core pipe is arranged on the first oil cylinder 10 by third cavity 23 and supplies
Oily access connection, simplifies the structure of oil cylinder, oil cylinder is avoided to break down.
Specifically, since the 4th cavity 24 is connected to the second cavity 14 always, when third cavity 23 and the first cavity 13 connect
When logical, the hydraulic oil entered in the first cavity 13 from fuel feeding access is able to enter third cavity 23, makes the volume of third cavity 23
Increase；And the 4th hydraulic oil in cavity 24 is able to enter the second cavity 14 and the fuel feeding access by being connected to the second cavity 14
Reflux, reduces the volume of the 4th cavity 24, so that the extension end of the second oil cylinder 20 be made to stretch out.On the other hand, when third cavity
23 with the first cavity 13 when being connected to, and the hydraulic oil for entering the second cavity 14 from fuel feeding access is able to enter the 4th cavity 24, makes the
The volume of four cavitys 24 increases；And the hydraulic oil in third cavity 23 be able to enter the first cavity 13 and by with the first cavity 13
The fuel feeding access of connection flows back, and reduces the volume of the first cavity 13, so that the extension end of the second oil cylinder 20 be made to retract.
In the embodiment of the present invention, hydraulic control system further includes fuel feeding access and control device.The first of fuel feeding access
End is connected to the first cavity 13, and the second end of fuel feeding access is connected to the second cavity 14.Control device is controlled by control device
First cavity 13 is connected to or disconnects with third cavity 23.
In above-mentioned setting, hydraulic oil can be transported in the first oil cylinder 10 by fuel feeding access, and control device can control
One cavity 13 is connected to or disconnects with third cavity 23, and the first oil cylinder 10 and the second oil cylinder 20 is made to realize scheduled stretching motion.
In the embodiment of the present invention, the vehicle body of 22 relative vehicle of first piston 12 and second piston is fixedly installed, the first cylinder
Body 11 forms the extension end of the first oil cylinder 10, and the second cylinder body 21 forms the extension end of the second oil cylinder 20.The first of first oil cylinder 10
Cavity 13 is rodless cavity, and the second cavity 14 is rod chamber.The third cavity 23 of second oil cylinder 20 is rodless cavity, and the 4th cavity 24 is
Rod chamber.
Optionally, when the extension end of the first oil cylinder 10 reaches first position, the first cavity 13 of control device control with
Third cavity 23 is connected to so that the extension end of the second oil cylinder 20 can be stretched out.When first position is left in the extension end of the first oil cylinder 10
When, the first cavity 13 is disconnected with third cavity 23 so that the extension end of the second oil cylinder 20 is static.
Pass through above-mentioned setting, when can control the first cylinder body 11 arrival first position of the first oil cylinder 10, the second oil cylinder 20
The second cylinder body 21 stretch out again；Not at first position, the second oil cylinder 20 is remain stationary first cylinder body 11 of the first oil cylinder 10.
Certainly, in an alternative embodiment of the present invention, control device also can control the first oil cylinder 10 and the second oil cylinder
20 stretch out or retract at the same time simultaneously.
Preferably, when the extension end of the first oil cylinder 10 reaches first position, extension end reaches the maximum position of stretching.
After can making the first cylinder body 11 of the first oil cylinder 10 fully extended in this way, the second cylinder body 21 of the second oil cylinder 20 is stretched again
Out.
As shown in Fig. 2, in an embodiment of the present invention, the first oil cylinder 10 further includes first be arranged on the first cylinder body 11
Hydraulic fluid port a.When the extension end of the first oil cylinder 10 reaches first position, the first cavity of the first hydraulic fluid port a connection 13 and third cavity
23, so that the first cavity 13 is connected to third cavity 23；When first position is left in the extension end of the first oil cylinder 10, the first cavity
13 and first hydraulic fluid port a disconnect.
In above-mentioned setting, when the extension end of the first oil cylinder 10 reaches first position, by being arranged in the first cylinder body 11
On the first hydraulic fluid port a be connected to the first cavity 13 and third cavity 23, structure is simple, easy to control.
Specifically, as shown in Fig. 2, the lower part of the circumferential side wall of the first cylinder body 11 is arranged in the first hydraulic fluid port a.
Optionally, when the first cylinder body 11 of the first oil cylinder 10 leaves first position, the first hydraulic fluid port a and third cavity 23 can
To be in connected state.Since the first hydraulic fluid port a at this time is not connected to or only with second with the first cavity 13 and the second cavity 14
Cavity 14 is connected to, i.e., third cavity 23 is connected to the second cavity 14, while the 4th cavity 24 is connected to the second cavity 14, therefore the
Two oil cylinders, 20 pressure at both sides balance, the second cylinder body 21 of the second oil cylinder 20 are remain stationary.
As shown in Fig. 2, in an embodiment of the present invention, the first oil cylinder 10 further includes the first oil duct 121, the second oil duct 122
With third oil duct 123.First body of rod of the first oil duct 121 perforation first piston 12 and the first piston being connect with first body of rod
Head, one end of the first oil duct 121 are connected to the first cavity 13, and the other end of the first oil duct 121 and the first end of fuel feeding access connect
It is logical.Second oil duct 122 is arranged on first body of rod of first piston 12 and is isolated with the first oil duct 121, the second oil duct 122
One end is connected to the second cavity 14, and one end of the second oil duct 122 is connected to the second end of fuel feeding access.Third oil duct 123 is arranged
On the first piston head of first piston 12, third oil duct 123 is connected to the first oil duct 121 and is isolated with the second oil duct 122.
When the extension end of the first oil cylinder 10 reaches first position, third oil duct 123 is corresponding with the position of the first hydraulic fluid port a and is connected to,
First cavity 13 is connected to by third oil duct 123 with the first hydraulic fluid port a；When first position is left in the extension end of the first oil cylinder 10,
Third oil duct 123 and the position of the first hydraulic fluid port a are staggered, and the first cavity 13 is not connected to the first hydraulic fluid port a.
In above-mentioned setting, by the way that the first oil duct 121 is arranged on first piston 12, the second oil duct 122 realizes fuel feeding respectively
Access is connected to the first cavity 13, the second cavity 14, controls the first chamber by the third oil duct 123 being arranged on first piston 12
Whether body 13 is connected to the first hydraulic fluid port a, and structure is simple, easy to process, and control is accurate.
Specifically, the one end of the first oil duct 121 not being connected to the first cavity 13 forms the 7th oil on first piston 12
Mouth e.The one end of second oil duct 122 not being connected to the second cavity 14 forms the 8th hydraulic fluid port f on first piston 12.When the first oil
When first cylinder body 11 of cylinder 10 is fully extended, the hydraulic fluid port that the second oil duct 122 is connected to the second cavity 14 is still located at the first cylinder body 11
It is interior.
As shown in Fig. 2, in an embodiment of the present invention, the second oil cylinder 20 further includes second body of rod for penetrating through second piston 22
4th oil duct 221 of the second piston head connecting with second body of rod, the 4th oil duct 221 are connected to third cavity 23.Hydraulic control
System processed further includes the first pipeline 30 for connecting the first hydraulic fluid port a and the 4th oil duct 221.Control device includes being arranged first
For controlling the first switch valve 31 of the on-off of the first pipeline 30 on pipeline 30.When the extension end of the first oil cylinder 10 reaches first
When position, first switch valve 31 controls the connection of the first pipeline 30；When first position is left in the extension end of the first oil cylinder 10, first
Switch valve 31 controls the first pipeline 30 and disconnects.
By above-mentioned setting, first switch valve 31 can control the connected state of the first hydraulic fluid port a and the 4th oil duct 221, mention
The reliability of high hydraulic control system.When third oil duct 123 and the first hydraulic fluid port a are disconnected, the first hydraulic fluid port a and the 4th oil duct 221 are disconnected
It opens, it can be ensured that hydraulic oil will not enter the 4th oil duct 221 or the first oil of entrance from the 4th oil duct 221 from the first hydraulic fluid port a
Mouthful a and the second cavity 14 being connected to the first hydraulic fluid port a, prevent the first oil cylinder 10 and the second oil cylinder 20 in vehicle travel process or
Play occurs when person's emergency brake, improves the reliability of the stretching structure of vehicle.
Specifically, first switch valve 31 is hydraulic-controlled switch valve.There are two the first actuator ports, first for the tool of first switch valve 31
Control port and the second control port.First switch valve 31 has the first operating position for disconnecting two the first actuator ports
With the second operating position for being connected to two the first actuator ports.Two the first actuator ports are connect with the first pipeline 30, the
One control port is connected to the first hydraulic fluid port a, and the second control port is connected to the second cavity 14, passes through the first control port and second
Control port switches first switch valve 31 between the first operating position and the second operating position.When the stretching of the first oil cylinder 10
When end reaches first position, first switch valve 31 is in the second operating position；When the extension end of the first oil cylinder 10 leaves first
When position, first switch valve 31 is in the first operating position.
In this way, first switch valve 31 can be first when the first cylinder body 11 of the first oil cylinder 10 reaches first position
Automatically it is connected to the first pipeline 30 under the hydraulic fluid pressure effect of hydraulic fluid port a, so that the first hydraulic fluid port a is connected to the 4th oil duct 221,
The stretching for realizing the second oil cylinder 20 simplifies hydraulic control system configuration without additional control element.
Optionally, first switch valve 31 is 2/2-way pilot operated valve device.
Optionally, in an embodiment of the present invention, when the extension end of the first oil cylinder 10 is retracted into the second position, control dress
The first cavity 13 of control is set to be connected to third cavity 23 so that the extension end of the second oil cylinder 20 can retract when the first oil cylinder 10
When the second position is left in extension end, control device controls the first cavity 13 and disconnects with third cavity 23 so that the second oil cylinder 20 is stretched
Outlet is static.
By above-mentioned setting, when can control the first cylinder body 11 of the first oil cylinder 10 and being retracted into the second position, the second oil cylinder
20 the second cylinder body 21 retracts again；When first cylinder body 11 of the first oil cylinder 10 does not reach the second position, the second oil cylinder 20 keeps quiet
Only.
As shown in figure 5, in an embodiment of the present invention, the first oil cylinder 10 further includes second be arranged on the first cylinder body 11
Hydraulic fluid port b, the second hydraulic fluid port b is connected to the first cavity 13, when the extension end of the first oil cylinder 10 is retracted into the second position, the second hydraulic fluid port
B is connected to the first cavity 13 with third cavity 23 so that the first cavity 13 is connected to third cavity 23, when the stretching of the first oil cylinder 10
When the second position is left at end, the second hydraulic fluid port b and third cavity 23 are disconnected.
By above-mentioned setting, when the first cylinder body 11 of the first oil cylinder 10 is retracted into the second position, the first oil can control
When first cylinder body 11 of cylinder 10 reaches first position, the second cylinder body 21 of the second oil cylinder 20 stretches out again；The first of first oil cylinder 10
Not at first position, the second oil cylinder 20 is remain stationary cylinder body 11.Pass through the second hydraulic fluid port b connection being arranged on the first cylinder body 11
First cavity 13 and third cavity 23, structure is simple.In this way, when the first cylinder body 11 is located at first position and the second position, first
Cavity 13 is connected to by the first hydraulic fluid port a and the second hydraulic fluid port b with third cavity 23 respectively.
Preferably, when the extension end of the first oil cylinder 10 is retracted into the second position, extension end reaches the maximum position of retraction.
After first cylinder body 11 of the first oil cylinder 10 can in this way be fully retracted, the second cylinder body 21 of the second oil cylinder 20 contracts again
It returns.
As shown in figure 5, in an embodiment of the present invention, the second oil cylinder 20 further includes the 4 be arranged in second piston 22
Oil duct 221, the 4th oil duct 221 are connected to third cavity 23.Hydraulic control system further includes for connecting the second hydraulic fluid port b and the 4th
Second pipeline 40 of oil duct 221.Control device further includes being arranged on the second pipeline 40 for controlling the on-off of the second pipeline 40
Second switch valve 41.When the extension end of the first oil cylinder 10 is retracted into the second position, second pipe of the control of second switch valve 41
Road 40 is connected to；When the second position is left in the extension end of the first oil cylinder 10, second switch valve 41 controls the second pipeline 40 and disconnects.
By above-mentioned setting, second switch valve 41 can control the connected state of the second hydraulic fluid port b and the 4th oil duct 221, mention
The reliability of high hydraulic control system.When first cylinder body 11 does not reach the second position, the second hydraulic fluid port b does not connect with the 4th oil duct 221
It is logical, it can be ensured that hydraulic oil will not enter the 4th oil duct 221 or the second oil of entrance from the 4th oil duct 221 from the second hydraulic fluid port b
Mouth b and the first cavity 13 being connected to the second hydraulic fluid port b, further prevent the first oil cylinder 10 and the second oil cylinder 20 in vehicle driving mistake
Play occurs in journey or when emergency brake, improves the reliability of the stretching structure of vehicle.
As shown in figure 5, the one end of the 4th oil duct 221 not being connected to third cavity 23 forms the tenth in second piston 22
Hydraulic fluid port h, the both ends of the second pipeline 40 are connect with the second hydraulic fluid port b and the tenth hydraulic fluid port h respectively.
Specifically, as shown in figure 5, second switch valve 41 is hydraulic-controlled switch valve.First oil cylinder 10 further includes being arranged first
Third hydraulic fluid port c on cylinder body 11.There are two the second actuator port, third control port and the 4th controls for the tool of second switch valve 41
Hydraulic fluid port.Second switch valve 41 has the third operating position for disconnecting two the second actuator ports and makes two the second actuator ports
4th operating position of connection.Two the second actuator ports are connect with the second pipeline 40, third control port and the second hydraulic fluid port b
Connection, the 4th control port are connected to third hydraulic fluid port c, make second switch valve 41 by third control port and the 4th control port
Switch between third operating position and the 4th operating position.When the extension end of the first oil cylinder 10 is retracted into the second position, the
Two switch valves 41 are in third operating position；When the second position is left in the extension end of the first oil cylinder 10, at second switch valve 41
In the 4th operating position.
In this way, second switch valve 41 can be in third when the first cylinder body 11 of the first oil cylinder 10 is retracted into the second position
Automatically it is connected to the second pipeline 40 under the hydraulic fluid pressure effect of hydraulic fluid port c, so that the second hydraulic fluid port b is connected to the 4th oil duct 221,
The retraction for realizing the second oil cylinder 20 simplifies hydraulic control system configuration without additional control element.
Optionally, second switch valve 41 is 2/2-way pilot operated valve device.
As shown in figure 5, the first oil cylinder 10 further includes the 5th oil duct being arranged on the first piston head of first piston 12
124, the 5th oil duct 124 is connected to the second cavity 14.When the extension end of the first oil cylinder 10 is retracted into the second position, the 5th oil duct
124 is corresponding with the position of third hydraulic fluid port c and be connected to, and third hydraulic fluid port c is connected to by the 5th oil duct 124 with the second cavity 14；When
When the second position is left in the extension end of one oil cylinder 10, the position of the 5th oil duct 124 and third hydraulic fluid port c is staggered, the second cavity 14 with
Third hydraulic fluid port c is not connected to.
In above-mentioned setting, by the 5th oil duct 124 being arranged on first piston head, the second cavity 14 and can control
Whether three hydraulic fluid port c are connected to, to control the working condition of second switch valve 41, structure is simple, easy to process, and control is accurate.
As shown in Figures 1 to 5, the second oil cylinder 20 further includes the 6th oil duct 222 being arranged in second piston 22, the 6th oil
Road 222 is connected to the 4th cavity 24.First oil cylinder 10 further includes the 4th hydraulic fluid port d being arranged on the first cylinder body 11, the 4th hydraulic fluid port d
It is connected to the second cavity 14, the 4th hydraulic fluid port d is connected to the 6th oil duct 222 by third pipeline 50.
Specifically, the one end of the 6th oil duct 222 not being connected to the 4th cavity 24 forms the 9th oil in second piston 22
Mouth g, the both ends of third pipeline 50 are connect with the 4th hydraulic fluid port d and the 9th hydraulic fluid port g respectively.When the second cylinder body 21 of the second oil cylinder 20 is complete
When full stretching, the hydraulic fluid port that the 6th oil duct 222 is connected to the 4th cavity 24 is still located in the second cylinder body 21.
As shown in Figures 1 to 5, hydraulic control system further include the reversal valve 70 being arranged on fuel feeding access and with commutation
The oil pump 60 that valve 70 connects.There is reversal valve 70 the 5th hydraulic fluid port j and the 6th hydraulic fluid port k, the 5th hydraulic fluid port j to be connected to the first cavity 13,
6th hydraulic fluid port k is connected to the second cavity 14.Reversal valve 70 has first state and the second state, when reversal valve 70 is in the first shape
When state, the 5th hydraulic fluid port j is connected to oil pump 60, and the 6th hydraulic fluid port k is connected to fuel reserve tank, and hydraulic oil enters first from the 5th hydraulic fluid port j
Cavity 13, the hydraulic oil in the second cavity 14 are back to fuel reserve tank by the 6th hydraulic fluid port k, so that the first oil cylinder 10 stretches out；When changing
When being in the second state to valve 70, the 6th hydraulic fluid port k is connected to oil pump 60, and the 5th hydraulic fluid port j is connected to fuel reserve tank, and hydraulic oil is from
Six hydraulic fluid port k enter the second cavity 14, and the hydraulic oil in the first cavity 13 is back to fuel reserve tank by the 5th hydraulic fluid port j, so that first
Oil cylinder 10 retracts.
By above-mentioned setting, reversal valve 70 can switch the fuel feeding direction of hydraulic control system.
Wherein, oil pump 60 is connected to so that the hydraulic oil in fuel reserve tank to be transported in fuel feeding access with fuel reserve tank.
Preferably, reversal valve 70 also have the third state, when reversal valve 70 be in the third state, make the 5th hydraulic fluid port j and
Oil pump 60 and fuel reserve tank disconnect, and the 6th hydraulic fluid port k is disconnected with oil pump 60 and fuel reserve tank.
In the process of moving, reversal valve 70 is in the third state to vehicle, in this way, oil pump 60 in normal direction fuel feeding access without providing
Hydraulic oil, the hydraulic oil in fuel feeding access can not also flow back into fuel reserve tank, can prevent stretching structure in vehicle travel process
Play occurs under the action of inertia force.
Optionally, reversal valve 70 is the solenoid valve or hand-operated valve of three-position four-way valve.
As shown in Figures 1 to 5, fuel feeding access includes the 4th pipeline 80 and the 5th pipeline 90.One end of 4th pipeline 80 with
The connection of first cavity 13, the other end of the 4th pipeline 80 are connected to the 5th hydraulic fluid port j.One end of 5th pipeline 90 and the second cavity 14
Connection, the other end of the 4th pipeline 80 are connected to the 6th hydraulic fluid port k.Wherein, the 4th pipeline 80 is equipped with balanced valve 81.Balanced valve 81
Two third actuator ports connect with the 4th pipeline 80, the 5th control port of balanced valve 81 is connect with the 5th pipeline 90.
When reversal valve 70 is in first state, hydraulic oil is only capable of flowing to the first cavity 13 from the 5th hydraulic fluid port j；When reversal valve 70 is in the
When two-state, balanced valve 81 plays throttling action to the hydraulic oil for flowing to the 5th hydraulic fluid port j from the first cavity 13.
In above-mentioned setting, when reversal valve 70 is in first state, the first oil cylinder 10 and/or the second oil cylinder 20 stretch out, and stretch
Direction and gravity direction are on the contrary, need to overcome gravity out, and hydraulic oil is only capable of flowing to the first cavity from the 5th hydraulic fluid port j at this time
13, i.e. the check valve state that is in unidirectional overcurrent of balanced valve 81, when can prevent oil pump 60 from breaking down, the first oil cylinder 10 and/
Or second oil cylinder 20 under the effect of gravity suddenly retract.When reversal valve 70 is in the second state, the first oil cylinder 10 and/or second
Oil cylinder 20 retracts, and retracted orientation is consistent with gravity direction, and balanced valve 81 is to the hydraulic oil for flowing to the 5th hydraulic fluid port j from the first cavity 13
Throttling action is played, the resistance of oil cylinder retraction can be increased, so that resistance and gravity is in state in a basic balance, keeps oil cylinder steady
It retracts.
In addition, a balanced valve 81, which is only arranged, in hydraulic control system of the invention can be realized the extension end of the first oil cylinder 10
With the steady contraction of the extension end of the second oil cylinder 20, hydraulic control is simplified compared with needing to be arranged two balanced valves in the prior art
The structure of system processed.
Specifically, one end of the not connected 5th hydraulic fluid port j of the 4th pipeline 80 is connect with the 7th hydraulic fluid port e.5th pipeline 90
One end of not connected 6th hydraulic fluid port k is connect with the 7th hydraulic fluid port e.
The course of work of hydraulic control system of the invention is as follows:
As shown in Figure 1, under original state, the first cylinder body 11 and the second cylinder body 21 are in retracted mode, i.e. vehicle is stretched
Shrinking structure is in retracted mode.
First cylinder body 11 of the first oil cylinder 10 stretches out:
When needing stretching structure to stretch out, staff controls reversal valve 70, and reversal valve 70 is made to be in first state.
At this point, the 5th hydraulic fluid port j is connected to oil pump 60, and the 6th hydraulic fluid port k is connected to fuel reserve tank, i.e. the 4th pipeline 80 is fuel feeding
Pipeline, the 5th pipeline 90 are oil return line, and therefore, the pressure of the hydraulic oil in the 4th pipeline 80 is greater than the liquid in the 5th pipeline 90
The pressure of pressure oil.5th control port of balanced valve 81 is connected to the 5th pipeline 90, the insufficient pressure of the 5th control port with gram
The active force of spring in balanced valve 81 is taken, balanced valve 81 is in the 4th state, and hydraulic oil is only capable of flowing to the first chamber from the 5th hydraulic fluid port j
Body 13.The hydraulic oil that oil pump 60 exports passes sequentially through the 5th hydraulic fluid port j, the 4th pipeline 80, the first oil duct 121 and enters the first cavity
13, the hydraulic oil in the second cavity 14 passes sequentially through the second oil duct 122, the 5th pipeline 90 and the 6th hydraulic fluid port k and is back to fuel reserve tank.
In this way, first cylinder body 11 is mobile relative to first piston 12, the first chamber under the pressure effect of the hydraulic oil in the first cavity 13
The volume of body 13 increases, and the volume of the second cavity 14 reduces, so that the first cylinder body 11 stretches out.
In the process, the first hydraulic fluid port a and the 4th hydraulic fluid port d are connected to the second cavity 14, and the of first switch valve 31
One control port is connected to the first hydraulic fluid port a, and the second control port is connected to the 4th hydraulic fluid port d, therefore the first control port and second
The oil liquid pressure of control port is identical, and in first switch valve 31 under the action of spring, first switch valve 31 is in the first work
Two the first actuator ports of position, first switch valve 31 disconnect, therefore the first pipeline 30 disconnects, the oil of the first hydraulic fluid port a and the tenth
Mouth h is not connected to.Second hydraulic fluid port b and third hydraulic fluid port c are connected to the first cavity 13, and the third control port of second switch valve 41
It is connected to the second hydraulic fluid port b, the 4th control port is connected to third hydraulic fluid port c, therefore third control port and the 4th control port
Oil liquid pressure is identical, and in second switch valve 41 under the action of spring, second switch valve 41 is in third operating position, and second opens
Two the second actuator ports for closing valve 41 disconnect, therefore the second pipeline 40 disconnects, and the second hydraulic fluid port b is not also connected to the tenth hydraulic fluid port h.
Although being connected at this point, the second cavity 14 passes through the 4th hydraulic fluid port d, third pipeline 50 and the 6th oil duct 222 with the 4th cavity 24,
It is that third cavity 23 is disconnected with the first hydraulic fluid port a and the second hydraulic fluid port b, does not have hydraulic oil to enter or flow out in third cavity 23,
Therefore, the second oil cylinder 20 remains stationary.
Second cylinder body 21 of the second oil cylinder 20 stretches out:
As shown in Fig. 2, the first cylinder body 11 reaches most when the first cylinder body 11 of the first oil cylinder 10 reaches first position
Big position, the first hydraulic fluid port a are connected to the third oil duct 123 on first piston 12, due to third oil duct 123 and the first oil duct 121
It is connected to the first cavity 13, therefore oil pump 60 can be led to by the hydraulic oil that the first oil duct 121 is supplied into the first cavity 13
Cross the first actuator port and the first control oil that third oil duct 123, the first hydraulic fluid port a and the 4th pipeline 80 flow to first switch valve 31
Mouthful, i.e., the first control port is connected to oil feed line at this time, and the second control port is connected to oil return line, therefore the first control oil
The hydraulic fluid pressure of mouth is greater than the hydraulic fluid pressure of the second control port, under the hydraulic fluid pressure effect of the first control port,
First switch valve 31 automatically switches to the second operating position, two the first working oils of first switch valve 31 from the first operating position
Mouth connection, so that the first pipeline 30 is connected to, and then the first hydraulic fluid port a is connected to the tenth hydraulic fluid port h.In this way, the liquid that oil pump 60 exports
Pressure oil passes sequentially through the 5th hydraulic fluid port j, the 4th pipeline 80, the first oil duct 121, third oil duct 123, the first hydraulic fluid port a, the first pipeline
30, the 4th oil duct 221 enters third cavity 23.5th oil duct 124 is connected to the second oil duct 122 and the 4th hydraulic fluid port d, the 4th chamber
Hydraulic oil in body 24 passes sequentially through the 6th oil duct 222, third pipeline 50, the 4th hydraulic fluid port d, the 5th oil duct 124, the second oil duct
122, the 5th pipeline 90 and the 6th hydraulic fluid port k are back to fuel reserve tank.In this way, the pressure effect of the hydraulic oil in third cavity 23
Under, the second cylinder body 21 is mobile relative to second piston 22, and the volume of third cavity 23 increases, and the volume of the 4th cavity 24 reduces,
So that third cavity 23 stretches out.Fig. 3 is the structural schematic diagram of hydraulic control system when the second cylinder body 21 stretches out.
In the process, second switch valve 41 is in third operating position, two the second working oils of second switch valve 41
Mouth remains open, therefore the second pipeline 40 remains open.
First cylinder body 11 of the first oil cylinder 10 retracts:
As shown in figure 4, staff controls reversal valve 70 when needing stretching structure to stretch out, it is switched to reversal valve 70
Second state.
At this point, the 6th hydraulic fluid port k is connected to oil pump 60, and the 5th hydraulic fluid port j is connected to fuel reserve tank, i.e. the 5th pipeline 90 is fuel feeding
Pipeline, the 4th pipeline 80 are oil return line, and therefore, the pressure of the hydraulic oil in the 5th pipeline 90 is greater than the liquid in the 4th pipeline 80
The pressure of pressure oil.5th control port of balanced valve 81 is connected to the 5th pipeline 90, in the pressure of the hydraulic oil of the 5th control port
Under masterpiece is exerted oneself, balanced valve 81 automatically switches to the 5th state, and balanced valve 81 is to the liquid for flowing to the 5th hydraulic fluid port j from the first cavity 13
Pressure oil plays throttling action.Oil pump 60 export hydraulic oil pass sequentially through the 6th hydraulic fluid port k, the 5th pipeline 90, the second oil duct 122 into
Enter the second cavity 14, the hydraulic oil in the first cavity 13 passes sequentially through the first oil duct 121, the 4th pipeline 80 and the 5th hydraulic fluid port j and returns
It flow to fuel reserve tank.In this way, first cylinder body 11 is relative to first piston 12 under the pressure effect of the hydraulic oil in the second cavity 14
Mobile, the volume of the second cavity 14 increases, and the volume of the first cavity 13 reduces, so that the first cylinder body 11 retracts.
In the process, be connected to due to the first control port of first switch valve 31 with the first hydraulic fluid port a, the first hydraulic fluid port a with
Third oil duct 123 is connected to, since third oil duct 123 is connected to by the first oil duct 121 with the 4th pipeline 80, the first control oil
Mouth is connected to oil return line；And the second control port is connected to the 5th pipeline 90, i.e. the second control port is connected to oil feed line,
Therefore, the hydraulic fluid pressure of the second control port is greater than the hydraulic fluid pressure of the first control port, in the liquid of the second control port
Under oil pressure effect, first switch valve 31 automatically switches to the first operating position, first switch valve 31 from the second operating position
Two the first actuator ports disconnect so that the first pipeline 30 disconnect, and then make the first hydraulic fluid port a and the tenth hydraulic fluid port h disconnection.Together
When, second switch valve 41 is in third operating position, and the second pipeline 40 remains open, therefore, third cavity 23 and the first hydraulic fluid port a
It is disconnected with the second hydraulic fluid port b, there is no hydraulic oil to enter or flow out in third cavity 23, therefore, the second oil cylinder 20 remains stationary.
Second cylinder body 21 of the second oil cylinder 20 retracts:
As shown in figure 5, the first cylinder body 11 is retracted into most when the first cylinder body 11 of the first oil cylinder 10 is retracted into the second position
Big position, third hydraulic fluid port c are connected to the 5th oil duct 124 on first piston 12, due to the second oil duct 122 and the 5th oil duct 124
It is connected to the second cavity 14, therefore oil pump 60 can be led to by the hydraulic oil that the second oil duct 122 is supplied into the second cavity 14
Cross the 5th oil duct 124, third hydraulic fluid port c flow to the 4th control port of second switch valve 41, i.e. the 4th control port at this time and confession
Oil pipe line connection.And the second hydraulic fluid port b is connected to by the first cavity 13 and the first oil duct 121 with the 4th pipeline 80, i.e., third controls
Hydraulic fluid port is connected to oil return line.Therefore, the hydraulic fluid pressure of the 4th control port is greater than the hydraulic fluid pressure of third control port,
Under the hydraulic fluid pressure effect of the 4th control port, second switch valve 41 automatically switches to the 4th work from third operating position
Position, second switch valve 41 two the second actuator ports connection so that the second pipeline 40 be connected to, and then by the second hydraulic fluid port b with
Tenth hydraulic fluid port h connection.
In this way, the hydraulic oil that oil pump 60 exports passes sequentially through the 6th hydraulic fluid port k, the 5th pipeline 90, the second oil duct the 122, the 4th
Hydraulic fluid port d, the 6th oil duct 222 enter the 4th cavity 24.Hydraulic oil in third cavity 23 passes sequentially through the 4th oil duct 221, second
Pipeline 40, the second hydraulic fluid port b, the first oil duct 121, the 4th pipeline 80 and the 5th hydraulic fluid port j are back to fuel reserve tank.In the 4th cavity 24
Hydraulic oil pressure effect under, the second cylinder body 21 is mobile relative to second piston 22, and the volume of the 4th cavity 24 increases, third
The volume of cavity 23 reduces, so that third cavity 23 retracts.
In the process, first switch valve 31 is in the first operating position, so that the first pipeline 30 remains open.
In the prior art, not only cylinder structure is complicated for the hydraulic control system of stretching structure, and needs to be arranged and commutate
The oil cylinder switching valve of valve cooperation is just able to achieve the expanding-contracting action of two oil cylinders.It wherein include pilot operated valve device and control hydraulic control in reversal valve
The solenoid valve of the control port of valve.Staff needs to control oil cylinder switching valve and reversal valve respectively in operation.Simultaneously
Hydraulic control system there is provision of two balanced valves to connect one to one with two oil cylinders.In addition, it is also necessary to which setting auxiliary supplies
Oil system provides control oil sources and repairing check valve for oil cylinder switching valve.Above-mentioned hydraulic control system configuration is complicated, control is multiple
It is miscellaneous, failure risk point is more, higher cost.
Hydraulic control system of the invention only includes two switch valves, not only simplifies cylinder structure, and significantly simplify
The structure of hydraulic control system, reduces amount of parts, to reduce being produced into for the risk and product to break down
This.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements: control third
The connected state of cavity and the first cavity can just be such that the first cavity and third cavity and the fuel feeding access of hydraulic control system connects
It is logical, realize that the extension end of the second oil cylinder can be stretched out or retract, it is not necessary that core pipe is arranged on the first oil cylinder by third cavity
It is connected to fuel feeding access, simplifies the structure of oil cylinder, oil cylinder is avoided to break down.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so that presently filed embodiment described herein can be in addition to illustrating herein
Or the sequence other than those of description is implemented.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of hydraulic control system of telescoping mechanism, which is characterized in that the hydraulic control system includes:
First oil cylinder (10), including the first cylinder body (11) and the first piston (12) being arranged in first cylinder body (11), institute
It states first piston (12) and the inner cavity of first cylinder body (11) is divided into the first cavity (13) and the second cavity (14)；
Second oil cylinder (20), including the second cylinder body (21) and the second piston (22) being arranged in second cylinder body (21), institute
It states second piston (22) and the inner cavity of second cylinder body (21) is divided into third cavity (23) and the 4th cavity (24), described
Four cavitys (24) are connected to second cavity (14)；
Wherein, it is connected to by controlling first cavity (13) with the third cavity (23) so that second oil cylinder (20)
Extension end can be stretched out or retract；
The hydraulic control system further include:
Fuel feeding access, the first end of the fuel feeding access are connected to first cavity (13), the second end of the fuel feeding access
It is connected to second cavity (14)；
Control device controls first cavity (13) and the third cavity (23) even on-off by the control device
It opens；
First oil cylinder (10) further includes the first hydraulic fluid port a being arranged on first cylinder body (11), when first oil cylinder
(10) when extension end reaches first position, the first hydraulic fluid port a is connected to first cavity (13), the control device
It controls the first hydraulic fluid port a to be connected to the third cavity (23), so that first cavity (13) and the third cavity
(23) be connected to, the extension end of second oil cylinder (20) can stretch out, when the extension end of first oil cylinder (10) leave it is described
When first position, first cavity (13) and the first hydraulic fluid port a are disconnected, and the control device controls the first hydraulic fluid port a
It disconnects with the third cavity (23) so that the extension end of second oil cylinder (20) is static.
2. hydraulic control system according to claim 1, which is characterized in that first oil cylinder (10) further include:
First oil duct (121), first for penetrating through first body of rod of the first piston (12) and connecting with first body of rod are living
Chock plug, one end of first oil duct (121) are connected to first cavity (13), the other end of first oil duct (121)
It is connected to the first end of the fuel feeding access；
Second oil duct (122) is arranged on first body of rod and is isolated with first oil duct (121), second oil
The one end in road (122) is connected to second cavity (14), and the of one end of second oil duct (122) and the fuel feeding access
The connection of two ends；
Third oil duct (123) is arranged on the first piston head, the third oil duct (123) and first oil duct (121)
It is connected to and is isolated with second oil duct (122), when the extension end of first oil cylinder (10) reaches the first position
When, the third oil duct (123) is corresponding with the position of the first hydraulic fluid port a and is connected to, and first cavity (13) passes through described
Third oil duct (123) is connected to the first hydraulic fluid port a, when the first position is left in the extension end of first oil cylinder (10)
When, the third oil duct (123) and the position of the first hydraulic fluid port a are staggered, first cavity (13) and the first hydraulic fluid port a
It is not connected to.
3. hydraulic control system according to claim 1, which is characterized in that second oil cylinder (20) further includes perforation institute
The 4th oil duct (221) of second piston head stating second body of rod of second piston (22) and being connect with second body of rod, it is described
4th oil duct (221) is connected to the third cavity (23), and the hydraulic control system further includes for connecting first oil
The first pipeline (30) of mouth a and the 4th oil duct (221), the control device include being arranged on first pipeline (30)
For controlling the first switch valve (31) of the on-off of first pipeline (30), there are two first for first switch valve (31) tool
Actuator port, the first control port and the second control port, two first actuator ports with first pipeline
(30) it connects, first control port is connected to the first hydraulic fluid port a, second control port and second cavity
(14) it is connected to, the first switch valve (31) is controlled in the first work by first control port and second control port
Make to switch between position and the second operating position, when the extension end of first oil cylinder (10) reaches the first position,
The first switch valve (31) is in second operating position, two the first actuator port connections, when first oil
When the first position is left in the extension end of cylinder (10), the first switch valve (31) is in first operating position, and two
First actuator port disconnects.
4. hydraulic control system according to any one of claim 1 to 3, which is characterized in that first oil cylinder (10)
It further include that the second hydraulic fluid port b, the second hydraulic fluid port b being arranged on first cylinder body (11) and first cavity (13) connect
It is logical, when the extension end of first oil cylinder (10) is retracted into the second position, the second hydraulic fluid port b and first cavity (13)
Connection, the control device controls the second hydraulic fluid port b and is connected to the third cavity (23), so that first cavity (13)
It is connected to the third cavity (23), the extension end of second oil cylinder (20) can retract, when first oil cylinder (10)
When the second position is left in extension end, the second hydraulic fluid port b and the third cavity (23) are disconnected, the control device control
The second hydraulic fluid port b and the third cavity (23) disconnect, so that the extension end of second oil cylinder (20) is static.
5. hydraulic control system according to claim 4, which is characterized in that second oil cylinder (20) further includes that setting exists
The 4th oil duct (221) on the second piston (22), the 4th oil duct (221) are connected to the third cavity (23), institute
Stating hydraulic control system further includes the second pipeline (40) for connecting the second hydraulic fluid port b and the 4th oil duct (221), institute
Stating control device further includes second that the on-off for being used to control second pipeline (40) is arranged on second pipeline (40)
Switch valve (41), when the extension end of first oil cylinder (10) is retracted into the second position, the second switch valve (41)
Second pipeline (40) connection is controlled, when the second position is left in the extension end of first oil cylinder (10), described the
Two switch valves (41) control second pipeline (40) and disconnect.
6. hydraulic control system according to claim 5, which is characterized in that first oil cylinder (10) further includes that setting exists
Third hydraulic fluid port c on first cylinder body (11), there are two the second actuator port, thirds to control for second switch valve (41) tool
Hydraulic fluid port and the 4th control port, the second switch valve (41) have the third work for disconnecting two second actuator ports
The 4th operating position made position and be connected to two second actuator ports, two second actuator ports with it is described
Second pipeline (40) connection, the third control port is connected to the second hydraulic fluid port b, the 4th control port and described the
Three hydraulic fluid port c connection, first oil cylinder (10) further include the 5th be arranged on the first piston head of the first piston (12)
Oil duct (124), the 5th oil duct (124) are connected to second cavity (14), when the extension end of first oil cylinder (10)
When being retracted into the second position, the 5th oil duct (124) is corresponding with the position of the third hydraulic fluid port c and is connected to, and described
Three hydraulic fluid port c are connected to by the 5th oil duct (124) with second cavity (14), and the second switch valve (41) is in described
Third operating position, when the second position is left in the extension end of first oil cylinder (10), the 5th oil duct (124) with
The position of the third hydraulic fluid port c is staggered, and second cavity (14) is not connected to the third hydraulic fluid port c, the second switch valve
(41) it is in the 4th operating position.
7. hydraulic control system according to any one of claim 1 to 3, which is characterized in that the hydraulic control system
It further include the reversal valve (70) being arranged on the fuel feeding access and the oil pump (60) being connect with the reversal valve (70), it is described
Reversal valve (70) has the 5th hydraulic fluid port j and the 6th hydraulic fluid port k, and the 5th hydraulic fluid port j is connected to first cavity (13), and described the
Six hydraulic fluid port k are connected to second cavity (14), and the reversal valve (70) has first state and the second state, when the commutation
When valve (70) is in the first state, the 5th hydraulic fluid port j is connected to the oil pump (60), and the 6th hydraulic fluid port k and storage
Fuel tank connection, hydraulic oil enter first cavity (13) from the 5th hydraulic fluid port j, the hydraulic oil in second cavity (14)
It is back to the fuel reserve tank by the 6th hydraulic fluid port k, so that first oil cylinder (10) stretches out；At the reversal valve (70)
When second state, the 6th hydraulic fluid port k is connected to the oil pump (60), and the 5th hydraulic fluid port j and the fuel reserve tank
Connection, the hydraulic oil enter the second cavity (14) from the 6th hydraulic fluid port k, and the hydraulic oil in first cavity (13) passes through
The 5th hydraulic fluid port j is back to the fuel reserve tank, so that first oil cylinder (10) retracts.
8. a kind of vehicle, including stretching structure and the hydraulic control system being connect with the stretching structure, which is characterized in that described
Hydraulic control system is hydraulic control system described in any one of claims 1 to 7.
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| CN201710683338.5A CN107477036B (en) | 2017-08-10 | 2017-08-10 | The hydraulic control system of telescoping mechanism and vehicle with it |
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| CN107477036B true CN107477036B (en) | 2019-04-23 |
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| JP2006300280A (en) * | 2005-04-25 | 2006-11-02 | Kobelco Cranes Co Ltd | Hydraulic cylinder circuit |
| CN103423220A (en) * | 2012-05-24 | 2013-12-04 | 合肥神马科技集团有限公司 | Hydraulic system for controlling telescopic arms |
| CN203641139U (en) * | 2013-11-05 | 2014-06-11 | 三一帕尔菲格特种车辆装备有限公司 | Hydraulic sequence telescoping mechanism and engineering machinery |
| CN105864134A (en) * | 2016-04-22 | 2016-08-17 | 三帕尔菲格特种车辆装备有限公司 | Multi-oil-cylinder sequential telescopic system and crane |
| CN205527441U (en) * | 2015-12-31 | 2016-08-31 | 徐州重型机械有限公司 | Flexible hydraulic system of multisection arm and hoist |
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2017
- 2017-08-10 CN CN201710683338.5A patent/CN107477036B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006300280A (en) * | 2005-04-25 | 2006-11-02 | Kobelco Cranes Co Ltd | Hydraulic cylinder circuit |
| CN103423220A (en) * | 2012-05-24 | 2013-12-04 | 合肥神马科技集团有限公司 | Hydraulic system for controlling telescopic arms |
| CN203641139U (en) * | 2013-11-05 | 2014-06-11 | 三一帕尔菲格特种车辆装备有限公司 | Hydraulic sequence telescoping mechanism and engineering machinery |
| CN205527441U (en) * | 2015-12-31 | 2016-08-31 | 徐州重型机械有限公司 | Flexible hydraulic system of multisection arm and hoist |
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| CN107477036A (en) | 2017-12-15 |
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