CN111894921A - Hydraulic system of telescopic boom, telescopic boom and engineering vehicle - Google Patents
Hydraulic system of telescopic boom, telescopic boom and engineering vehicle Download PDFInfo
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- CN111894921A CN111894921A CN202010751102.2A CN202010751102A CN111894921A CN 111894921 A CN111894921 A CN 111894921A CN 202010751102 A CN202010751102 A CN 202010751102A CN 111894921 A CN111894921 A CN 111894921A
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- 230000008569 process Effects 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 230
- 239000010720 hydraulic oil Substances 0.000 description 13
- 230000007246 mechanism Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
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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
- 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
- F15B11/22—Synchronisation of the movement of 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/044—Working platforms suspended from booms
- B66F11/046—Working platforms suspended from booms of the telescoping type
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/41—Flow control characterised by the positions of the valve element
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/455—Control of flow in the feed line, i.e. meter-in control
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The application discloses a hydraulic system of a telescopic boom, the telescopic boom and an engineering vehicle, which comprise a first oil way, a multi-stage telescopic cylinder, a second oil way, a balance valve, a back pressure valve and a control oil way; the rodless cavities of the telescopic cylinders are communicated with the first oil passages, and oil is synchronously fed or returned through the first oil passages; the rod cavities of the telescopic cylinders are communicated with the second oil passages, and oil is synchronously fed or returned through the second oil passages; the balance valve is arranged on the first oil path, and the control oil path is communicated with the control end of the balance valve and the second oil path; the back pressure valve is arranged on the first oil way, and is arranged on the oil inlet side of the balance valve so as to generate preset oil return back pressure on the first oil way. The hydraulic system of the telescopic boom, the telescopic boom and the engineering vehicle can effectively reduce shaking.
Description
Technical Field
The application relates to a hydraulic system, in particular to a hydraulic system of a telescopic boom, the telescopic boom and an engineering vehicle.
Background
In the prior art, a device for maintenance operations such as airplane deicing is generally a maintenance vehicle, the maintenance vehicle mainly includes a vehicle chassis, a swing mechanism, a turntable, an arm support, an amplitude-changing mechanism and a working bucket, the arm support includes a main arm and a fly jib connected to the tail end of the main arm, the amplitude-changing mechanism includes a main amplitude-changing mechanism and a fly jib amplitude-changing mechanism, the swing mechanism is installed on the vehicle chassis, the turntable is installed on the swing mechanism, the arm support is installed on the turntable, the main amplitude-changing mechanism is installed between the turntable and the main arm for changing the pitch angle of the main arm, the fly jib amplitude-changing mechanism is installed between the main arm and the fly jib for changing the pitch angle of the fly jib, the working bucket is installed at the tail end of the fly jib. The cantilever crane is driven by a plurality of telescopic oil cylinders when being stretched, and the flow difference between oil ways is large, so that the shaking is caused.
Disclosure of Invention
In view of this, embodiments of the present application are expected to provide a hydraulic system for a telescopic boom, a telescopic boom and an engineering vehicle, so as to reduce the shake.
In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:
the hydraulic system of the telescopic boom comprises a first oil way, a multi-stage telescopic cylinder, a second oil way, a balance valve, a back pressure valve and a control oil way; the rodless cavities of the telescopic cylinders are communicated with the first oil passages, and oil is synchronously fed or returned through the first oil passages; the rod cavities of the telescopic cylinders are communicated with the second oil passages, and oil is synchronously fed or returned through the second oil passages; the balance valve is arranged on the first oil path, and the control oil path is communicated with the control end of the balance valve and the second oil path; the back pressure valve is arranged on the first oil way, and is arranged on the oil inlet side of the balance valve so as to generate preset oil return back pressure on the first oil way.
Further, the control oil path includes a first orifice.
Further, the hydraulic system comprises a flow dividing oil path with a second throttling opening, a first end of the flow dividing oil path is connected to a control oil path between the first throttling opening and the control end, and a second end of the flow dividing oil path is communicated with the first oil path on the oil inlet side of the balance valve.
Further, the hydraulic system comprises a shunting oil path with a second throttling opening, a first end of the shunting oil path is communicated with the control oil path, and a second end of the shunting oil path is communicated with the first oil path positioned on the oil inlet side of the balance valve so as to realize shunting.
Further, the telescopic cylinder comprises a piston, a piston rod and a cylinder body, the piston is movably arranged in the cylinder body to isolate the rodless cavity and the rod cavity, and a first working oil port communicated with the rodless cavity is formed in the cylinder body; a process flow passage penetrating through the piston and the piston rod is formed in the telescopic cylinder, a first end port of the process flow passage is communicated with the rodless cavity, and a second end port of the process flow passage is arranged on a structure of the piston rod, which is positioned outside the cylinder body; between the adjacent two stages of telescopic cylinders, the second end port of the process flow passage of the telescopic cylinder at the upper stage is communicated with the first working oil port of the cylinder body of the telescopic cylinder at the lower stage; the first oil way is communicated with the first working oil port of the first-stage telescopic cylinder, so that a plurality of rodless cavities of the telescopic cylinder can synchronously feed or return oil through the first oil way.
Further, the telescopic cylinder comprises a piston, a piston rod and a cylinder body, the piston is movably arranged in the cylinder body to isolate the rodless cavity and the rod cavity, and a second working hole and a third working hole which are communicated with the rod cavity are formed in the cylinder body; between the adjacent two stages of telescopic cylinders, the third working hole of the cylinder body of the telescopic cylinder at the previous stage is communicated with the second working hole of the cylinder body of the telescopic cylinder at the next stage; the second oil path is communicated with the second working hole of the first-stage telescopic cylinder, so that a plurality of rod cavities of the telescopic cylinder can synchronously feed or return oil through the second oil path.
Further, the balance valve comprises a first one-way valve and a sequence valve, a first oil inlet of the first one-way valve is communicated with the first side of the first oil path, a first oil outlet of the first one-way valve is communicated with the second side of the first oil path, a second oil inlet of the sequence valve is communicated with the second side of the first oil path, a second oil outlet of the sequence valve is communicated with the first side of the first oil path, and a control end of the balance valve is arranged on the sequence valve.
Furthermore, the communication pipeline between the multistage telescopic cylinders is a hard pipe.
Further, the hydraulic system includes an accumulator disposed on the second oil line.
Furthermore, the hydraulic system comprises a second check valve, a throttle valve and a third oil path, the third oil path is connected between the first oil path and the second oil path, the second check valve and the throttle valve are both arranged on the third oil path, the throttle valve is arranged on the oil outlet side of the second check valve, and oil in the third oil path can flow to the first oil path through the second check valve.
The telescopic arm support comprises a plurality of stages of arm sections which are mutually sleeved and the hydraulic system; the two adjacent arm sections are connected through at least one telescopic cylinder respectively, and the telescopic cylinder can drive the corresponding arm section to stretch through stretching; when the telescopic arm support is in a retraction state, all the telescopic cylinders are distributed at intervals on the periphery of the arm section located on the outermost side.
The engineering vehicle comprises a vehicle body and the telescopic arm support, wherein the telescopic arm support is arranged on the vehicle body.
In the hydraulic system of the telescopic boom provided by the embodiment of the application, the rodless cavities of the plurality of telescopic cylinders synchronously feed or return oil through the first oil passages, and the rod cavities of the plurality of telescopic cylinders synchronously feed or return oil through the second oil passages, so that the oil passages and control elements can be saved while the telescopic boom is ensured to be stretched out and retracted, and the setting of the hydraulic system is simplified; the balance valve is arranged on the first oil path, when the second oil path is fed with oil, the opening pressure of the control end is reached, the balance valve enables the first oil path to be communicated, the opening degree is adjusted according to the pressure, the flow of the first oil path is kept constant, and the shake is properly reduced; the backpressure valve is arranged on the first oil way, so that preset oil return backpressure can be generated on the first oil way, and the pressure of the oil way of the hydraulic system is ensured to be stable; through balanced valve and back pressure valve, stabilize hydraulic system from the multiple aspect jointly, reduce the shake condition.
Drawings
FIG. 1 is a schematic diagram of a prior art hydraulic system in which the pump, tank and associated connecting lines are eliminated;
FIG. 2 is a schematic diagram of a hydraulic system according to an embodiment of the present application, wherein the pump, the tank and the associated connecting lines are omitted;
FIG. 3 is a partial view A of FIG. 2;
FIG. 4 is a partial view B of FIG. 2;
FIG. 5 is a schematic diagram of a hydraulic system according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of a telescopic boom according to an embodiment of the present application; in the figure, all the telescopic cylinders are in an extending state, and the fly jib, the amplitude-variable oil cylinder, the water pipe winding disc, the oil pipe winding disc and the electric wire winding disc are simultaneously shown;
FIG. 7 is a partial view of C of FIG. 6;
fig. 8 is a schematic structural diagram of a telescopic boom according to an embodiment of the present application; all telescoping cylinders are shown in a retracted state, showing the fly arm, water coil, oil tube coil and electrical wire coil;
FIG. 9 is a schematic structural diagram of a work vehicle according to an embodiment of the present application; in the figure, all the telescopic cylinders are in a retracted state.
Detailed Description
It should be noted that, in the case of conflict, the technical features in the examples and examples of the present application may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the present application and should not be construed as an improper limitation of the present application.
In the description of the embodiments of the present application, the "up", "down", "left", "right", "front", "back" orientation or positional relationship is based on the orientation or positional relationship shown in fig. 6, it is to be understood that these orientation terms are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present application.
As shown in fig. 2 to 9, the telescopic boom 200 includes a plurality of stages of boom sections 100 and a hydraulic system that are sleeved with each other; the hydraulic system comprises a first oil path 1, a multi-stage telescopic cylinder 2, a second oil path 3, a balance valve 4, a back pressure valve 5 and a control oil path 7.
The plurality of arm sections 100 are sleeved with each other, two adjacent arm sections 100 are connected with each other through at least one telescopic cylinder 2, and the telescopic cylinders 2 can drive the corresponding arm sections 100 to extend and retract through extension and retraction; all the telescopic cylinders 2 are arranged on the outer sides of the corresponding arm sections 100, and the telescopic cylinders 2 can drive the corresponding arm sections 1 to extend and retract through extension. When the telescopic arm support is in a retraction state, that is, after all the telescopic cylinders 2 are retracted to the right position, all the telescopic cylinders 2 are distributed at intervals on the periphery of the arm section 100 located at the outermost side.
Compared with the traditional arrangement mode of arranging the telescopic cylinder 2' in the cavity of the arm section 100, the arrangement mode of the telescopic cylinder 2 adopted in the embodiment does not need to utilize the space in the arm section 100, so that the arm sections 100 which are mutually sleeved can be arranged more compactly on the cross section, and the telescopic cylinder 2 is arranged without considering reserving enough space in the arm section 1, therefore, the telescopic arm support 100 of the embodiment can increase the total height of the telescopic arm support 200 after extending out by sleeving more arm sections 1 with smaller calibers under the condition of ensuring that the appearance size of the telescopic arm support 100 is not increased. In addition, the telescopic cylinder 2 may have potential safety hazards such as cracking after being used for a long time, and therefore, the telescopic cylinder 2 is arranged on the outer side of the arm section 1, so that a user can conveniently observe whether the telescopic cylinder 2 is abnormal or not, and meanwhile, the telescopic cylinder 2 is convenient to maintain and replace. In other embodiments, two adjacent arm sections 1 may be connected by a plurality of telescopic cylinders 2.
However, the telescopic cylinder 2 is moved from the cavity of the arm section 100 to the outside, and the starting mode of the telescopic cylinder 2 is changed. As shown in fig. 1, the conventional arrangement of the telescopic cylinders 2 ' is connected in parallel to the pressure oil circuit, and each telescopic cylinder 2 ' is controlled by a separate control valve 21 '. When the telescopic arm support needs to be unfolded, the control valve 21' is opened, the upper arm section 100 is controlled to extend out from the lower arm section 100, the upper arm section 100 extends out, the lower arm section 100 extends out again, and the like; therefore, the starting number of the telescopic cylinders 2 'can be controlled to be limited one or a few in the same time period, and the oil pump only needs to meet the oil quantity input of a single telescopic cylinder 2'; the oil input and output in the pressure oil path and the oil return path has little change.
By adopting the arrangement mode of the telescopic arm support 200 in the embodiment of the application, all the telescopic cylinders 2 are distributed at intervals on the periphery of the arm section 100 positioned at the outermost side, as shown in fig. 2 to 9, the rodless cavities 21 of the plurality of telescopic cylinders 2 are communicated with the first oil path 1, and the rodless cavities 21 of the plurality of telescopic cylinders 2 synchronously feed or return oil through the first oil path 1; the rod cavities 22 of the telescopic cylinders 2 are communicated with the second oil passages 3, and the rod cavities 22 of the telescopic cylinders 2 synchronously feed or return oil through the second oil passages 3.
That is, when the rod-free cavities 21 of the multiple telescopic cylinders 2 are filled with oil, the rod cavities 22 are filled with oil, all the telescopic cylinders 2 are in a stretching state, and each arm section 100 stretches out from the corresponding upper arm section 100 at the same time, so that the stretching of the telescopic arm support 200 is realized; all the telescopic cylinders 2 are in a retraction state, and all the arm sections 100 extend out of the corresponding upper arm section 100 at the same time, so that the extension of the telescopic arm support 200 is realized; similarly, when the rod cavities 22 of the multiple telescopic cylinders 2 are filled with oil, the rod-free cavities 21 are filled with oil, all the telescopic cylinders 2 are in a retraction state, and each arm section 100 is retracted into the corresponding upper arm section 100. When the extension and retraction of the telescopic boom 200 are ensured, oil paths and control elements can be saved, and the arrangement of a hydraulic system is simplified.
It should be understood that, the extension and retraction of the telescopic boom 200 are completed by the simultaneous actions of all the telescopic cylinders 2, rather than the action of a single telescopic cylinder 2, so that during the action, the oil amount fed or returned by the first oil path 1 and the second oil path 3 is larger than that of the conventional arrangement, and the pressure change is more severe. Particularly, under the condition that the telescopic boom 200 is in load retraction, the pressure fluctuation between the first oil path 1 and the second oil path 3 is too large, the flow rate is unbalanced, and the shaking is caused.
For this reason, it is necessary to provide the balance valve 4 on the first oil passage 1, and the control oil passage 7 communicates the control end 43 of the balance valve 4 with the second oil passage 3.
When the first oil way 1 is filled with oil, the balance valve 4 is normally conducted, the second oil way 3 is filled with oil, and the telescopic arm support 200 normally extends out.
When the first oil path 1 stops feeding oil, the balance valve 4 is disconnected, and the hydraulic oil in the rodless cavity 21 of the telescopic cylinder 2 can keep the telescopic arm support 200 at the position to be static, so that the telescopic arm support is prevented from falling down automatically.
When the second oil path 3 takes oil to reach the opening pressure of the control end 43, the balance valve 4 enables the first oil path 1 to be communicated, and the opening degree is adjusted according to the pressure, so that the flow of the first oil path 1 is kept constant, and the shake is properly reduced.
In addition, a backpressure valve 5 can be arranged on the first oil path 1, and the backpressure valve 5 is arranged on the oil inlet side of the balance valve 4, so that a preset oil return backpressure can be generated on the first oil path 1, and the oil path pressure of the hydraulic system is ensured to be stable; the balance valve 4 and the back pressure valve 5 are combined to stabilize the hydraulic system from multiple aspects, and the shaking condition of the hydraulic system is reduced.
In one possible embodiment, as shown in fig. 2, 4 and 5, the hydraulic system includes a branch oil passage 8 with a second orifice 81, a first end of the branch oil passage 8 communicates with the control oil passage 7, and a second end of the branch oil passage 8 communicates with the first oil passage 1 on the oil intake side of the balancing valve 4 to achieve the branch.
Specifically, when the second oil path 3 takes oil, hydraulic oil flows into the control end 43, so that the first oil path 1 is conducted, and part of the hydraulic oil flows into the shunt oil path 8 through the control oil path 7 and finally reaches the first oil path 1 on the oil inlet side of the balance valve 4, so that the flow rate of the hydraulic oil between the first oil path 1 and the second oil path 3 is balanced, and the shaking caused by the overlarge flow difference is avoided.
When the first oil path 1 is filled with oil, the balance valve 4 is normally conducted, the second oil path 3 is filled with oil, part of hydraulic oil flows into the control oil path 7 through the flow dividing oil path 8 and finally reaches the second oil path 3, the flow of the hydraulic oil between the first oil path 1 and the second oil path 3 is balanced, and shaking caused by overlarge flow difference is avoided.
It should be understood that the second orifice 81 may generate a pressure difference on both sides, and the first oil passage 1 is prevented from directly communicating with the second oil passage 3 by the second orifice 81 while the branch oil passage 8 performs a branch function; in the case of oil intake of the second oil passage 3, the second orifice 81 ensures that the hydraulic oil in the second oil passage 3 gives the control end 43 a suitable opening pressure, thereby rendering the first oil passage 1 conductive.
In one possible embodiment, as shown in fig. 2, 4 and 5, the control oil circuit 7 includes a first orifice 71 to prevent an excessive flow from impacting the control end 43.
If the hydraulic system includes the branch oil path 8 with the second orifice 81, the first end of the branch oil path 8 is connected to the control oil path 7 between the first orifice 71 and the control end 43, the second end of the branch oil path 8 is communicated with the first oil path 1 on the oil inlet side of the balance valve 4, and the functions of the branch oil path 8 and the second orifice 81 are the same, which will not be described herein again. When the first orifice 71 and the second orifice 81 are specifically arranged, the diameter of the first orifice 71 is larger than that of the second orifice 81, for example, the first orifice 71 may be arranged to be 1.0mm, and the second orifice 81 may be arranged to be 0.8mm, so as to ensure that the oil path between the first orifice 71 and the second orifice 81 has a proper pressure, that is, when the second oil path 3 is fed, the hydraulic oil flowing into the control end 43 may reach the opening pressure, so that the first oil path 1 is conducted.
In a possible embodiment, as shown in fig. 2, 3, 5, 6 and 8, the telescopic cylinder 2 comprises a piston 23, a piston rod 25 and a cylinder 24, the piston 23 being movably arranged in the cylinder 24 to isolate the rodless chamber 21 and the rod chamber 22. The piston rod 25 is disposed on the piston 23, and the piston rod 25 and the piston 23 may be integrally formed, or the piston rod 25 and the piston 23 may be separately processed and then assembled and fixed.
The piston rod 25 penetrates through the rod cavity 22 to the outside of the cylinder body 24; the telescopic cylinder 2 is formed with a process flow passage 26 penetrating through the piston 23 and the piston rod 25, a first end port of the process flow passage 26 is communicated with the rodless cavity 21, a second end port of the process flow passage 26 is arranged on a structure of the piston rod 25 located outside the cylinder body 24 so as to communicate the rodless cavity 21 with the outside, and a first working oil port 241 communicated with the rodless cavity 21 is formed on the cylinder body 24 so as to communicate the rodless cavity 21 with the outside.
Between two adjacent telescopic cylinders 2, the second end port of the process flow passage 26 of the previous telescopic cylinder 2 is communicated with the first working oil port 241 of the cylinder body 24 of the next telescopic cylinder 2; the first oil path 1 is communicated with the first working oil ports 241 of the first-stage telescopic cylinders 2, and the rodless cavities 21 of all the telescopic cylinders 2 are communicated with the first oil path 1 in a parallel connection mode, so that the rodless cavities 21 of the telescopic cylinders 2 synchronously feed or return oil through the first oil path 1; the first working oil port 241 of the last stage and the second end port of the process flow passage 26 should be blocked by plugs.
In addition, the cylinder 24 may be formed with a second working hole 242 and a third working hole 243 communicating with the rod chamber 22; between the adjacent two stages of telescopic cylinders 2, the third working hole 243 of the cylinder body 24 of the previous stage of telescopic cylinder 2 is communicated with the second working hole 242 of the cylinder body 24 of the next stage of telescopic cylinder 2; the second oil path 3 is communicated with the second working hole 242 of the first-stage telescopic cylinder 2, and the rod cavities 22 of all the telescopic cylinders 2 are communicated with the second oil path 3 in a parallel connection mode, so that the rod cavities 22 of the plurality of telescopic cylinders 2 can synchronously feed or return oil through the second oil path 3.
In one possible embodiment, as shown in fig. 2, 4 and 5, the balancing valve 4 includes a first check valve 41 and a sequence valve 42, a first oil inlet 411 of the first check valve 41 communicates with a first side of the first oil path 1, a first oil outlet 412 of the first check valve 41 communicates with a second side of the first oil path 1, a second oil inlet 421 of the sequence valve 42 communicates with the second side of the first oil path 1, a second oil outlet 422 of the sequence valve 42 communicates with the first side of the first oil path 1, and a control end 43 of the balancing valve 4 is arranged on the sequence valve 42; it will be appreciated that in each embodiment, the flow from the first side of the first oil path 1 to the second side of the first oil path 1 is the oil inlet direction of the first oil path 1, i.e. the oil is fed from the rodless chamber 21.
When the first oil way 1 is filled with oil, the first one-way valve 41 is communicated, the sequence valve 42 is closed, the balance valve 4 is normally communicated, the second oil way 3 is filled with oil, and the telescopic arm support 200 normally extends out.
When the first oil path 1 stops feeding oil, the first check valve 41 is closed, the sequence valve 42 is closed, and the hydraulic oil in the rodless cavity 21 of the telescopic cylinder 2 can keep the telescopic arm support 200 at the position to be static, so that the telescopic arm support is prevented from falling down by itself.
When the second oil path 3 is filled with oil, the first check valve 41 is closed, the hydraulic oil flowing to the control end 43 of the control oil path 7 reaches the opening pressure, the sequence valve 42 is switched on, the first oil path 1 is switched on, the opening degree is adjusted according to the pressure, the flow of the first oil path 1 is kept constant, and the shake is properly reduced.
It should be noted that, if the hydraulic system includes the branch oil path 8 with the second orifice 81, and the control oil path 7 includes the first orifice 71, when the first oil path 1 is filled with oil, the sequence valve 42 may also be conducted, specifically, a part of the hydraulic oil in the first oil path 1 flows into the control oil path 7 through the branch oil path 8, and the calibers of the second orifice 81 and the first orifice 71 are adjusted, so that the section from the first orifice 71 to the control end 43 in the control oil path 7 reaches the opening pressure of the control end 43, and the sequence valve 42 is opened, thereby balancing the flow rates of the first oil path 1 and the second oil path 3.
In one possible embodiment, as shown in fig. 6 to 9, each arm segment 100 includes a first end and a second end, and in two adjacent arm segments 100, the first end of the arm segment 100 located at the inner side may extend from the first end of the arm segment 100 located at the outer side; each stage of telescopic cylinder 2 is respectively connected with the first end of the corresponding two adjacent stages of arm sections 100, so that after all telescopic cylinders 2 are retracted to the right position, the mutually sleeved arm sections 100 can be arranged more compactly in the axial direction of the arm sections 100, and the overall height of the retracted telescopic arm support 100 is reduced.
In order to facilitate the installation of the telescopic cylinder 2, the telescopic boom further comprises a plurality of connecting assemblies 110, and the plurality of connecting assemblies 110 are respectively arranged at the first end of each stage of boom section 100; each telescopic cylinder 2 is connected with the connecting component 110 on the corresponding two adjacent arm sections 100.
As shown in fig. 2 to 9, in the two adjacent arm sections 100, the end surface of the first end of the cylinder body 24 of the telescopic cylinder 2 is connected to the connecting assembly 110 on the arm section 100 located on the outer side, and the first end of the piston rod 25 of the telescopic cylinder 2 is connected to the connecting assembly 110 on the arm section 100 located on the inner side; therefore, the effective stroke of the piston rod 25 can be fully utilized to drive the corresponding arm section 1 to stretch, meanwhile, the length of the connecting pipeline between the telescopic cylinders 2 is short, the communicating pipeline between the multi-stage telescopic cylinders 2 is a hard pipe, the pipeline arrangement is simple, and the reliability of the connecting pipeline is improved.
In this embodiment, the telescopic cylinder 2 may be a hydraulic cylinder, and in other embodiments, the telescopic cylinder 2 may also be an air cylinder or an electric cylinder.
In one possible embodiment, as shown in fig. 2 to 5, the hydraulic system includes an accumulator 9, and the accumulator 9 is disposed on the second oil path 3, so that the oil pressure fluctuation is small, and the hydraulic system is ensured to be more stable and reliable.
In one possible embodiment, as shown in fig. 5, the hydraulic system includes a second check valve 120, a throttle 130 and a third oil path 140, the third oil path 140 is connected between the first oil path 1 and the second oil path 3, the second check valve 120 and the throttle 130 are both disposed on the third oil path 140, the throttle 130 is disposed on the oil outlet side of the second check valve 120, and the oil in the third oil path 140 can flow to the first oil path 1 through the second check valve 120 to achieve the diversion.
Specifically, when the first oil path 1 is filled with oil, the second check valve 120 is closed, and the second oil path 3 is normally filled with oil. When oil enters the second oil path 3, the first oil path 1 returns oil, the second check valve 120 is conducted, and part of the hydraulic oil in the second oil path 3 flows into the first oil path 1 through the throttle valve 130, so that the flow rate of the hydraulic oil between the first oil path 1 and the second oil path 3 is balanced, the overlarge flow rate difference is avoided, the second check valve 120, the throttle valve 130 and the third oil path 140 are combined with any of the embodiments, the hydraulic system is stabilized from multiple aspects, and the shaking condition of the hydraulic system is reduced.
In the present embodiment, the throttle 130 is an adjustable throttle with an adjustable caliber.
An engineering vehicle, as shown in fig. 2 to 9, includes a vehicle body 300 and a telescopic boom 200 in any of the above embodiments, where the telescopic boom 200 is disposed on the vehicle body 300.
The various embodiments/implementations provided herein may be combined with each other without contradiction.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. The hydraulic system of the telescopic boom is characterized in that: the hydraulic control system comprises a first oil way (1), a multi-stage telescopic cylinder (2), a second oil way (3), a balance valve (4), a back pressure valve (5) and a control oil way (7);
the rodless cavities (21) of the telescopic cylinders (2) are communicated with the first oil way (1), and the rodless cavities (21) of the telescopic cylinders (2) synchronously feed or return oil through the first oil way (1); the rod cavities (22) of the telescopic cylinders (2) are communicated with the second oil passages (3), and the rod cavities (22) of the telescopic cylinders (2) synchronously feed or return oil through the second oil passages (3);
the balance valve (4) is arranged on the first oil path (1), and the control oil path (7) is communicated with a control end (43) of the balance valve (4) and the second oil path (3);
the back pressure valve (5) is arranged on the first oil way (1), and the back pressure valve (5) is arranged on the oil inlet side of the balance valve (4) so as to generate preset oil return back pressure for the first oil way (1).
2. The hydraulic system of claim 1, wherein: the control oil passage (7) includes a first orifice (71).
3. The hydraulic system of claim 2, wherein: the hydraulic system comprises a flow dividing oil path (8) with a second throttling port (81), a first end of the flow dividing oil path (8) is connected to a control oil path (7) between the first throttling port (71) and the control end (43), and a second end of the flow dividing oil path (8) is communicated with the first oil path (1) on the oil inlet side of the balance valve (4).
4. The hydraulic system of claim 1, wherein: the hydraulic system comprises a flow dividing oil path (8) with a second throttling opening (81), a first end of the flow dividing oil path (8) is communicated with the control oil path (7), and a second end of the flow dividing oil path (8) is communicated with the first oil path (1) located on the oil inlet side of the balance valve (4) to achieve flow dividing.
5. The hydraulic system of claim 1, wherein: the telescopic cylinder (2) comprises a piston (23), a piston rod (25) and a cylinder body (24), the piston (23) is movably arranged in the cylinder body (24) to isolate the rodless cavity (21) and the rod cavity (22), and a first working oil port (241) communicated with the rodless cavity (21) is formed in the cylinder body (24); a process flow channel (26) penetrating through the piston (23) and the piston rod (25) is formed in the telescopic cylinder (2), a first end port of the process flow channel (26) is communicated with the rodless cavity (21), and a second end port of the process flow channel (26) is arranged on a structure of the piston rod (25) outside the cylinder body (24);
between two adjacent telescopic cylinders (2), a second end port of the process flow passage (26) of the telescopic cylinder (2) at the previous stage is communicated with the first working oil port (241) of the cylinder body (24) of the telescopic cylinder (2) at the next stage;
the first oil way (1) is communicated with the first working oil port (241) of the telescopic cylinder (2) in a first stage, so that a plurality of rodless cavities (21) of the telescopic cylinder (2) are synchronously fed with oil or returned with oil through the first oil way (1).
6. The hydraulic system of claim 1, wherein: the telescopic cylinder (2) comprises a piston (23), a piston rod (25) and a cylinder body (24), the piston (23) is movably arranged in the cylinder body (24) to isolate the rodless cavity (21) and the rod cavity (22), and a second working hole (242) and a third working hole (243) which are communicated with the rod cavity (22) are formed in the cylinder body (24);
between the adjacent two telescopic cylinders (2), the third working hole (243) of the cylinder body (24) of the telescopic cylinder (2) at the previous stage is communicated with the second working hole (242) of the cylinder body (24) of the telescopic cylinder (2) at the next stage;
the second oil way (3) is communicated with the first stage of the second working hole (242) of the telescopic cylinder (2), so that a plurality of rod cavities (22) of the telescopic cylinder (2) can synchronously feed oil or return oil through the second oil way (3).
7. The hydraulic system of claim 1, wherein: the balance valve (4) comprises a first one-way valve (41) and a sequence valve (42), a first oil inlet (411) of the first one-way valve (41) is communicated with the first side of the first oil path (1), a first oil outlet (412) of the first one-way valve (41) is communicated with the second side of the first oil path (1), a second oil inlet (421) of the sequence valve (42) is communicated with the second side of the first oil path (1), a second oil outlet (422) of the sequence valve (42) is communicated with the first side of the first oil path (1), and a control end (43) of the balance valve (4) is arranged on the sequence valve (42).
8. The hydraulic system of claim 1 or 7, wherein: and the communication pipelines among the multiple stages of telescopic cylinders (2) are hard pipes.
9. The hydraulic system of claim 1, wherein: the hydraulic system comprises an accumulator (9), and the accumulator (9) is arranged on the second oil way (3).
10. The hydraulic system of claim 1, wherein: the hydraulic system comprises a second check valve (120), a throttle valve (130) and a third oil path (140), the third oil path (140) is connected between the first oil path (1) and the second oil path (3), the second check valve (120) and the throttle valve (130) are both arranged on the third oil path (140), the throttle valve (130) is arranged on the oil outlet side of the second check valve (120), and oil in the third oil path (140) can flow to the first oil path (1) through the second check valve (120).
11. The telescopic arm support is characterized in that: comprising a plurality of mutually nested arm segments (100) and a hydraulic system according to claim 1;
two adjacent arm sections (100) are connected through at least one telescopic cylinder (2), and the telescopic cylinder (2) can drive the corresponding arm section (100) to stretch through stretching;
when the telescopic arm support is in a retraction state, all the telescopic cylinders (2) are distributed at intervals on the periphery of the arm section (100) located on the outermost side.
12. Engineering vehicle, its characterized in that: comprising a vehicle body (300) and a telescopic boom (200) according to claim 11, the telescopic boom (200) being arranged on the vehicle body (300).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010751102.2A CN111894921A (en) | 2020-07-30 | 2020-07-30 | Hydraulic system of telescopic boom, telescopic boom and engineering vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010751102.2A CN111894921A (en) | 2020-07-30 | 2020-07-30 | Hydraulic system of telescopic boom, telescopic boom and engineering vehicle |
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| CN111894921A true CN111894921A (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010751102.2A Pending CN111894921A (en) | 2020-07-30 | 2020-07-30 | Hydraulic system of telescopic boom, telescopic boom and engineering vehicle |
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| CN (1) | CN111894921A (en) |
Cited By (1)
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