CN115059658A - Telescopic oil cylinder hydraulic system and engineering machinery - Google Patents
Telescopic oil cylinder hydraulic system and engineering machinery Download PDFInfo
- Publication number
- CN115059658A CN115059658A CN202210568571.XA CN202210568571A CN115059658A CN 115059658 A CN115059658 A CN 115059658A CN 202210568571 A CN202210568571 A CN 202210568571A CN 115059658 A CN115059658 A CN 115059658A
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- hydraulic system
- telescopic cylinder
- balance valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000008929 regeneration Effects 0.000 claims abstract description 20
- 238000011069 regeneration method Methods 0.000 claims abstract description 20
- 230000001172 regenerating effect Effects 0.000 claims description 12
- 238000013016 damping Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 338
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1476—Special return means
-
- 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
- F15B13/022—Flow-dividers; Priority valves
-
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
-
- 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
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5159—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a return line
-
- 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7057—Linear output members being of the telescopic type
-
- 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
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/755—Control of acceleration or deceleration of the output member
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8606—Control during or prevention of abnormal conditions the abnormal condition being a shock
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/8613—Control during or prevention of abnormal conditions the abnormal condition being oscillations
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a telescopic oil cylinder hydraulic system and engineering machinery. Compared with the prior art, in the retracting process of the telescopic oil cylinder, the arm support can be effectively prevented from retracting and shaking by adding the pressure dividing function, and meanwhile, the emergency retracting working condition is considered, so that the pressure dividing oil way can be closed during emergency retracting, and the telescopic oil cylinder system is particularly suitable for a telescopic oil cylinder system with a long stroke; in addition, in the extension process of the telescopic oil cylinder, the boom can be extended quickly by adding a regeneration confluence function.
Description
Technical Field
The invention belongs to the field of engineering machinery, and particularly relates to engineering machinery and a hydraulic system of a telescopic oil cylinder of the engineering machinery.
Background
For some engineering machinery using a long-stroke telescopic oil cylinder, such as a high-altitude operation platform in a high-meter section, the situation of boom retraction and shaking often occurs due to the influence of the manufacturing process of a structural part and the deflection of the boom. Therefore, it is necessary to improve the manufacturing process in a targeted manner, but the cost is high. In addition, for the long-stroke telescopic oil cylinder, due to the increase of the stroke cylinder diameter, the extension speed is obviously reduced under the condition that the system flow cannot be greatly increased.
Disclosure of Invention
Aiming at the defects or shortcomings, the invention provides a telescopic oil cylinder hydraulic system and engineering machinery, and at least solves the problem of boom retraction shaking.
In order to achieve the above object, the present invention provides a hydraulic system for a telescopic cylinder, comprising:
a telescopic oil cylinder;
the rodless cavity working oil way is connected to the rodless cavity of the telescopic oil cylinder;
the rod cavity working oil way is connected to the rod cavity of the telescopic oil cylinder;
the oil return circuit is connected with the rodless cavity; and
and the pressure dividing oil way is connected with the oil return end of the oil return oil way and the oil inlet end of the working oil way with the rod cavity.
In some embodiments, an oil passage on-off valve is provided in the oil pressure dividing oil passage.
In some embodiments, a damping element is further disposed in the oil pressure dividing passage in series with the oil passage on-off valve.
In some embodiments, the maximum extension stroke of the telescopic cylinder is not less than 8 m.
In some embodiments, the telescopic cylinder hydraulic system further comprises:
and the oil return balance valve is arranged in the oil return oil way and comprises an oil return balance valve control oil way connected with the oil inlet end of the working oil way with the rod cavity.
In some embodiments, the telescopic cylinder hydraulic system further comprises:
the oil inlet balance valve of the rod cavity is arranged in the working oil circuit of the rod cavity;
the oil return end of the oil return balance valve is connected with the oil inlet end of the rod cavity oil inlet balance valve through the partial pressure oil way.
In some embodiments, the telescopic cylinder hydraulic system further comprises:
and the rodless cavity oil inlet check valve is arranged in the rodless cavity working oil way and is set to allow oil to flow to the rodless cavity and stop reversely.
In some embodiments, the telescopic cylinder hydraulic system further comprises:
and the regeneration confluence oil path is connected between the rodless cavity and the rod cavity and is provided with a regeneration confluence balance valve.
In some embodiments, a regenerative confluent balance valve control oil path of the regenerative confluent balance valve is connected to an oil inlet end of the rodless cavity working oil path.
In some embodiments, the telescopic cylinder hydraulic system further comprises:
the balance valve group is integrated with the regeneration confluence balance valve, the rod cavity oil inlet balance valve, the rodless cavity oil inlet one-way valve, the oil return balance valve and the oil path on-off valve;
and one side of the balance valve group, which is far away from the telescopic oil cylinder, is provided with an oil return valve port serving as an oil return end of the oil return oil way, a rod cavity oil inlet valve port serving as an oil inlet end of the rod cavity working oil way and a rodless cavity oil inlet valve port serving as an oil inlet end of the rodless cavity working oil way.
In some embodiments, the telescopic cylinder hydraulic system further comprises:
and the two working oil ports on one side of the main reversing valve are respectively connected with the rodless cavity working oil way and the rod cavity working oil way.
In addition, the invention also provides engineering machinery which comprises the telescopic oil cylinder hydraulic system.
The telescopic oil cylinder hydraulic system is additionally provided with the oil return oil path and the pressure dividing oil path, when the piston rod of the oil cylinder retracts, pressure oil flows to the rod cavity along the rod cavity working oil path, once retraction resistance changes, the pressure oil can flow to the oil return oil path from the rod cavity working oil path through the specially-arranged pressure dividing oil path, so that instantaneous pressure mutation cannot be formed at the oil inlet end of the rod cavity working oil path, and the pressure oil can be timely divided and returned through the pressure dividing oil path and the oil return oil path, so that the oil pressure of the oil entering the rod cavity is kept stable, the piston rod is enabled to retract stably, and arm support retraction jitter is reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a hydraulic schematic diagram of a conventional telescopic cylinder hydraulic system;
fig. 2 is a hydraulic schematic diagram of a telescopic cylinder hydraulic system according to an embodiment of the present invention.
Description of the reference numerals
1 'three-position four-way reversing valve 2' telescopic balance valve
3 'first sub-part of telescopic balance valve and 4' second sub-part of telescopic balance valve
1 main reversing valve 2 balance valve set
3 regeneration confluence balanced valve 4 pole chamber oil inlet balanced valve
5 rodless cavity oil inlet one-way valve 6 oil return balance valve
7 oil-way on-off valve 8 damping element
EXH oil return valve port of 100 telescopic oil cylinder
EXT rodless cavity oil inlet valve port RET rod cavity oil inlet valve port
L1 rodless cavity working oil path L2 rod cavity working oil path
L3 oil return oil way L4 partial pressure oil way
L5 regeneration confluence oil path K1 oil return balance valve control oil path
K2 oil return balance valve control oil way
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
The hydraulic system of the telescopic cylinder and the engineering machine of the invention are described below with reference to the accompanying drawings.
Boom engineering machinery generally adopts a telescopic oil cylinder to push a telescopic mechanism. Fig. 1 shows a conventional telescopic cylinder hydraulic system for realizing telescopic motion of a boom. The hydraulic valve members in the hydraulic system of the telescopic cylinder in fig. 1 include a three-position four-way reversing valve 1 ', a telescopic balance valve 2', a first sub-member 3 'of the telescopic balance valve, and a second sub-member 4' of the telescopic balance valve. When the electromagnetic valve Y2 'is electrified, pressure oil enters the telescopic balance valve 2' after passing through the three-position four-way reversing valve 1 ', and the telescopic oil cylinder is controlled to extend out after passing through the second sub-component 4' of the telescopic balance valve. When the electromagnetic valve Y1 'is electrified, pressure oil enters the telescopic balance valve 2' after passing through the three-position four-way reversing valve 1 ', and the telescopic oil cylinder is controlled to retract after passing through the first sub-component 3' of the telescopic balance valve.
Although the hydraulic system has a simple structure, the hydraulic system has the obvious defect that the hydraulic system is only suitable for the telescopic oil cylinder with a short stroke. For a telescopic oil cylinder system with a long stroke, return oil regeneration confluence cannot be realized, retraction jitter cannot be prevented, and for example, due to the increase of the stroke cylinder diameter, the extension speed is obviously slowed down under the condition that the flow of the system cannot be greatly increased.
In view of the above, in addition to considering the equal angle of the piston rod manufacturing process, the present invention is particularly directed to a hydraulic control system to promote and optimize a hydraulic control circuit, and to attempt to solve the problems of cylinder retraction jitter and the like.
As shown in fig. 2, the hydraulic system of a telescopic cylinder according to an embodiment of the present invention includes:
a telescopic cylinder 100;
a rodless chamber working oil path L1 connected to the rodless chamber of the telescopic cylinder 100;
a rod chamber working oil path L2 connected to the rod chamber of the telescopic cylinder 100;
an oil return path L3 connected with the rodless cavity; and
and the partial pressure oil path L4 is connected with the oil return end of the oil return oil path L3 and the oil inlet end of the rod cavity working oil path L2.
Compared with the hydraulic system shown in the figure 1, the telescopic oil cylinder hydraulic system is additionally provided with an oil return oil way L3 and a pressure dividing oil way L4 on the basis of a rodless cavity working oil way L1 and a rod cavity working oil way L2. When the piston rod of the telescopic oil cylinder 100 retracts, the rod cavity working oil path L2 is filled with pressure oil. When retraction resistance changes, the oil dividing oil path L4 is arranged and communicated with the rod cavity oil inlet valve port RET and the oil return valve port EXH, so that the oil inlet end of the rod cavity working oil path L2 (namely the rod cavity oil inlet valve port RET) can not form instantaneous pressure mutation, and can be timely divided through the oil dividing oil path L4, thereby keeping the oil pressure of oil entering the rod cavity stable and reducing arm support retraction shake.
In order to allow a sufficient flow of pressurized oil to flow into the rod chamber for rapid retraction during emergency retraction of the cylinder, the partial pressure oil path L4 needs to be closed at a proper time, and therefore, an oil path cutoff valve 7, such as the illustrated two-position two-way selector valve, is particularly provided in the partial pressure oil path L4. When the emergency retraction is performed, the oil path cut-off valve 7 is used for closing the oil dividing oil path L4, so that not only is enough flow and oil pressure ensured, but also enough oil pressure of the rod cavity oil inlet valve port RET is ensured, the oil return balance valve 6 in the oil return path L3 can be opened through the oil return balance valve control oil path K1, and smooth oil return is ensured.
Further, a damping element 8 connected in series to the oil passage shutoff valve 7 is provided in the partial pressure oil passage L4 to control the flow rate of the split flow passing through the partial pressure oil passage L4 and the pilot control oil pressure of the return-oil balance valve control oil passage K1. Specifically, in fig. 2, damping elements 8 are provided on both sides of the series of the oil passage cutoff valves 7, respectively.
Further, the telescopic cylinder hydraulic system further includes a regenerative confluence oil path L5, and a regenerative confluence oil path L5 is connected between the rodless chamber and the rod chamber and provided with a regenerative confluence balancing valve 3. Specifically, the regenerative confluent balance valve control oil passage K2 of the regenerative confluent balance valve 3 is connected to the oil feed end of the rodless chamber working oil passage L1.
By arranging the regeneration confluence oil path L5, when pressure oil flows to the rodless cavity through the rodless cavity working oil path L1, when the oil cylinder extends out, the rod cavity oil inlet valve port EXT is in a high-pressure state, the pressure oil is used as pilot oil, and the regeneration confluence balance valve 3 is opened through the regeneration confluence balance valve control oil path K2. Therefore, in the extending process of the piston rod of the oil cylinder, oil in the rod cavity is converged to the rodless cavity through the regeneration confluence balance valve 3, so that regeneration confluence is realized, and the pushing-out of the piston rod of the oil cylinder is accelerated.
It should be noted that, as will be explained below, the rod chamber oil inlet balance valve 4 is provided in the rod chamber working oil path L2, and during the extension of the cylinder piston rod, the rod chamber oil cannot return through the rod chamber working oil path L2, and only flows to the rodless chamber through the regeneration confluence oil path L5.
Referring to fig. 2, in the optimized hydraulic control circuit, because a regenerative confluence oil path L5 is provided, both the rodless cavity working oil path L1 and the rod cavity working oil path L2 are oil inlet paths, and oil return of both the rodless cavity and the rod cavity is oil return to an oil tank only through an oil return path L3.
Since the oil cylinder returns oil through the oil return path L3, the oil return path L3 is provided with the oil return balance valve 6, and the oil return balance valve 6 includes an oil return balance valve control path K1 connected to the oil inlet end of the rod chamber working oil path L2. And if and only when the pressure oil flows to the rod cavity through the rod cavity working oil way L2, so that the oil cylinder retracts, the pressure oil opens the oil return balance valve 6 through the rod cavity oil inlet valve port RET and the oil return balance valve control oil way K1, and the oil in the oil cylinder can return through the oil return oil way L3. When pressure oil flows to the rodless cavity through the rodless cavity working oil way L1, and the oil cylinder extends out, low-pressure oil flows through the rod cavity working oil way L2, the rod cavity oil inlet valve port RET is in a low-pressure state, and the oil return balance valve 6 cannot be opened through the oil return balance valve control oil way K1, so that oil in the oil cylinder is locked and oil cannot return through the oil return oil way L3.
Similarly, a rod chamber oil inlet balance valve 4 is provided in the rod chamber working oil path L2 to ensure that pressure oil can flow to the rod chamber through the rod chamber working oil path L2, and the rod chamber oil return cannot flow through the rod chamber working oil path L2. The partial pressure oil path L4 connects the oil return end of the oil return balance valve 6 and the oil inlet end of the rod cavity oil inlet balance valve 4, that is, connects between the oil return valve port EXH and the rod cavity oil inlet valve port RET.
Similarly, a rodless chamber oil inlet check valve 5 is provided in the rodless chamber working oil line L1, and the rodless chamber oil inlet check valve 5 is provided to allow oil to flow to the rodless chamber and to be blocked in the reverse direction, i.e., pressure oil can flow to the rodless chamber through the rodless chamber working oil line L1, but rodless chamber return oil cannot flow through the rodless chamber working oil line L1.
It should be particularly noted that, in this embodiment, the hydraulic system of the telescopic cylinder further includes a balance valve group 2, and the above-mentioned regeneration confluence balance valve 3, a rod cavity oil inlet balance valve 4, a rodless cavity oil inlet check valve 5, an oil return balance valve 6, an oil path on-off valve 7, and the like are integrated in the balance valve group 2. As shown in fig. 2, a side of the balancing valve set 2 away from the telescopic cylinder 100 is provided with an oil return valve port EXH serving as an oil return end of the oil return path L3, a rod chamber oil inlet valve port RET serving as an oil inlet end of the rod chamber working oil path L2, and a rod chamber oil inlet valve port EXT serving as an oil inlet end of the rod chamber working oil path L1.
In addition, the illustrated hydraulic system for the telescopic cylinder further includes a main directional control valve 1, and two working oil ports on one side of the main directional control valve 1 are connected to a rodless chamber working oil path L1 and a rod chamber working oil path L2, respectively. The other side of the main reversing valve 1 is connected with a pumping pipeline with a variable pump and an oil return pipeline returning to an oil tank. When the solenoid valve Y1 is energized, the variable displacement pump pumps pressure oil to the rod chamber working oil passage L2, and when the solenoid valve Y2 is energized, the variable displacement pump pumps pressure oil to the rodless chamber working oil passage L2.
In addition, the rodless chamber working oil passage L1 and the rod chamber working oil passage L2 are also connected to a safety relief valve, respectively, which is disposed between the balancing valve group 2 and the main directional control valve 1, as shown in fig. 2.
The optimized hydraulic system of the telescopic cylinder is suitable for engineering machinery with the telescopic cylinder, and is particularly suitable for the telescopic cylinder with a long telescopic stroke, for example, the maximum extending stroke of the telescopic cylinder 100 is not less than 8 m.
The working principle of the hydraulic system of the telescopic cylinder shown in fig. 2 is specifically explained as follows:
1) universal control loop
When the telescopic oil cylinder 100 extends out, an electromagnet Y2 of a three-position four-way main reversing valve 1 is electrified, pressure oil enters a rodless cavity oil inlet valve port EXT of a balance valve group 2 along a rodless cavity working oil way L1 after passing through the main reversing valve 1, and the telescopic oil cylinder is controlled to extend out after passing through a rodless cavity oil inlet one-way valve 5; meanwhile, the pressure oil entering the oil inlet valve port EXT of the rodless cavity is used as pilot control oil to open the regeneration confluence balance valve 3 through the oil return balance valve control oil path K2, and the oil of the rod cavity of the telescopic oil cylinder 100 enters the rodless cavity through the regeneration confluence oil path L5 and the regeneration confluence balance valve 3, so that the oil is converged, and the extension speed of the telescopic oil cylinder is increased.
When the telescopic oil cylinder retracts, an electromagnet Y1 of the main reversing valve 1 is electrified, pressure oil enters a rod cavity oil inlet valve port RET of the balance valve group 2 along a rod cavity working oil path L2 after passing through the main reversing valve 1, the pressure oil entering the rod cavity oil inlet valve port RET serves as pilot control oil and opens the oil return balance valve 6 through an oil return balance valve control oil path K1, the pressure oil of a rod cavity working oil path L2 controls the telescopic oil cylinder 100 to retract after passing through a one-way valve in the rod cavity oil inlet balance valve 4, and rodless cavity oil returns to an oil tank through the oil return balance valve 6 and an oil return valve port EXH along an oil return oil path L3;
meanwhile, the electromagnet Y3 of the oil path on-off valve 7 is electrified, and the oil path on-off valve 7 is communicated with the rodless cavity oil inlet valve port RET and the oil return valve port EXH, so that pressure oil entering the rod cavity oil inlet valve port RET of the balance valve group 2 flows back to the hydraulic oil tank after passing through the oil path on-off valve 7 and the related damping element 8, a partial pressure oil path L4 is formed, the pressure of the pressure oil of the rod cavity oil inlet valve port RET is kept stable, and the risk of arm support retraction and shaking is reduced.
2) Emergency retraction circuit
In an emergency retraction state, because the flow of pressure oil is small (generally less than 5L/min), at the moment, the pressure-dividing oil path L4 needs to be closed to prevent the pressure oil entering the RET port of the balance valve group 2 from being too low to open the return oil balance valve 6, which causes the failure of retraction, namely the electromagnet Y1 is electrified and the electromagnet Y3 is not electrified, the pressure oil enters the rod cavity oil inlet valve port RET of the balance valve group 2 after passing through the main reversing valve 1, the telescopic oil cylinder 100 is controlled to retract after passing through the rod cavity oil inlet balance valve 4 and the return oil balance valve 6, the rodless cavity oil returns to the hydraulic oil tank through the return oil valve port EXH of the balance valve group 2, and the pressure-dividing oil path L4 is closed.
In conclusion, the invention optimizes the structure of the balance valve group in the hydraulic system of the telescopic oil cylinder, reduces the risk of the retraction action shake of the telescopic oil cylinder, considers the emergency retraction state and ensures the normal emergency retraction function. Specifically, in the extending process, a regeneration confluence oil way is added, and the extending of a piston rod is accelerated; in the retracting process, a pressure-dividing oil way is added, an emergency retracting function is considered, an oil way on-off valve is arranged, electromagnetic switching can be achieved, the pressure-dividing oil way can be closed in the emergency state, and the situation that the pressure-dividing oil way is too large in oil amount to cause emergency failure is avoided.
Compared with the prior art, the boom can be quickly extended out by adding the regeneration confluence function in the extension process of the telescopic oil cylinder; in the retracting process of the telescopic oil cylinder, the arm support can be effectively prevented from retracting and shaking by adding the pressure dividing function, the emergency retracting working condition is considered, and the pressure dividing oil way can be closed during emergency retracting, so that the telescopic oil cylinder system is particularly suitable for a telescopic oil cylinder system with a long stroke.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. Telescopic cylinder hydraulic system, its characterized in that, telescopic cylinder hydraulic system includes:
a telescopic cylinder (100);
a rodless-chamber working oil passage (L1) connected to the rodless chamber of the telescopic cylinder (100);
a rod chamber working oil path (L2) connected to the rod chamber of the telescopic cylinder (100);
an oil return passage (L3) connected to the rodless chamber; and
and the partial pressure oil way (L4) is connected with the oil return end of the oil return oil way (L3) and the oil inlet end of the working oil way (L2) with the rod cavity.
2. The telescopic cylinder hydraulic system according to claim 1, wherein an oil passage on-off valve (7) is provided in the oil pressure dividing passage (L4).
3. The telescopic cylinder hydraulic system according to claim 2, wherein a damping element (8) is further provided in the partial pressure oil passage (L4) in series with the oil passage on-off valve (7).
4. The telescopic cylinder hydraulic system according to claim 1, wherein the maximum extension stroke of the telescopic cylinder (100) is not less than 8 m.
5. The telescopic cylinder hydraulic system according to any one of claims 1 to 4, further comprising:
and the oil return balance valve (6) is arranged in the oil return oil way (L3) and comprises an oil return balance valve control oil way (K1) connected with the oil inlet end of the working oil way (L2) with the rod cavity.
6. The telescopic cylinder hydraulic system according to claim 5, further comprising:
the rod cavity oil inlet balance valve (4) is arranged in the rod cavity working oil way (L2);
the partial pressure oil way (L4) is connected with an oil return end of the oil return balance valve (6) and an oil inlet end of the rod cavity oil inlet balance valve (4).
7. The telescopic cylinder hydraulic system according to claim 6, further comprising:
and the rodless cavity oil inlet check valve (5) is arranged in the rodless cavity working oil path (L1) and is used for allowing oil to flow to the rodless cavity and stopping in the opposite direction.
8. The telescopic cylinder hydraulic system according to claim 7, further comprising:
and a regenerative confluent oil passage (L5) connected between the rodless chamber and the rod chamber and provided with a regenerative confluent balance valve (3).
9. The telescopic cylinder hydraulic system according to claim 8, wherein a regenerative confluent balance valve control oil passage (K2) of the regenerative confluent balance valve (3) is connected to an oil feed end of the rodless chamber working oil passage (L1).
10. The telescopic cylinder hydraulic system according to claim 8, further comprising:
the balance valve group (2) is integrated with the regeneration confluence balance valve (3), the rod cavity oil inlet balance valve (4), the rodless cavity oil inlet check valve (5), the oil return balance valve (6) and the oil way on-off valve (7);
one side of the balance valve group (2) far away from the telescopic oil cylinder (100) is provided with an oil return valve port (EXH) serving as an oil return end of the oil return oil way (L3), a rod cavity oil inlet valve port (RET) serving as an oil inlet end of the rod cavity working oil way (L2) and a rodless cavity oil inlet valve port (EXT) serving as an oil inlet end of the rodless cavity working oil way (L1).
11. The telescopic cylinder hydraulic system according to claim 1, further comprising:
the hydraulic control system comprises a main reversing valve (1), wherein two working oil ports on one side of the main reversing valve (1) are respectively connected with a rodless cavity working oil way (L1) and a rod cavity working oil way (L2).
12. Engineering machinery, characterized in that the engineering machinery comprises a telescopic cylinder hydraulic system according to any one of claims 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210568571.XA CN115059658A (en) | 2022-05-24 | 2022-05-24 | Telescopic oil cylinder hydraulic system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210568571.XA CN115059658A (en) | 2022-05-24 | 2022-05-24 | Telescopic oil cylinder hydraulic system and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115059658A true CN115059658A (en) | 2022-09-16 |
Family
ID=83198863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210568571.XA Pending CN115059658A (en) | 2022-05-24 | 2022-05-24 | Telescopic oil cylinder hydraulic system and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115059658A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0732848A (en) * | 1993-07-22 | 1995-02-03 | Hitachi Constr Mach Co Ltd | Oil pressure control device for suspension |
| DE10330344A1 (en) * | 2003-07-05 | 2005-02-24 | Deere & Company, Moline | Active hydraulic spring, especially for a cantilever arm of a loading vehicle, has a control unit that monitors the position of a cylinder piston using a sensor and controls a regulatable pressure limiting unit accordingly |
| CN2758541Y (en) * | 2005-01-17 | 2006-02-15 | 江苏华宏科技股份有限公司 | Differential accelerating loop |
| CN102873849A (en) * | 2011-07-11 | 2013-01-16 | 博创机械股份有限公司 | Hydraulic loose core circuit having pressure release function |
| CN102979778A (en) * | 2012-12-07 | 2013-03-20 | 中联重科股份有限公司 | Three-position six-way reversing valve, hydraulic control system and engineering vehicle |
| CN103629175A (en) * | 2013-11-28 | 2014-03-12 | 长沙中联消防机械有限公司 | Working hopper hydraulic control system and engineering vehicle |
| CN204371815U (en) * | 2014-12-11 | 2015-06-03 | 湘电重型装备有限公司 | large electric wheel self-discharging vehicle stair hydraulic control integrated system |
| CN107701529A (en) * | 2017-09-15 | 2018-02-16 | 湖北航天技术研究院总体设计所 | A kind of multi-cylinder has cooperateed with perpendicular hydraulic system |
| CN107934807A (en) * | 2017-12-28 | 2018-04-20 | 徐工集团工程机械有限公司 | The variable amplitude hydraulic system and lorry-mounted crane of crane |
| CN214092512U (en) * | 2020-12-14 | 2021-08-31 | 河北雷萨重型工程机械有限责任公司 | Cantilever crane exhibition is received hydraulic system and pump truck |
| CN113790182A (en) * | 2021-09-22 | 2021-12-14 | 湖南星邦智能装备股份有限公司 | Cantilever crane self-weight retraction control system and control method |
| CN114427553A (en) * | 2022-01-26 | 2022-05-03 | 中国铁建重工集团股份有限公司 | Bundling machine and bale density adjusting and controlling hydraulic system thereof |
| CN216554696U (en) * | 2022-01-09 | 2022-05-17 | 郑州赫恩斯柯机电设备有限公司 | Integrated valve group for controlling action of hydraulic oil cylinder |
-
2022
- 2022-05-24 CN CN202210568571.XA patent/CN115059658A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0732848A (en) * | 1993-07-22 | 1995-02-03 | Hitachi Constr Mach Co Ltd | Oil pressure control device for suspension |
| DE10330344A1 (en) * | 2003-07-05 | 2005-02-24 | Deere & Company, Moline | Active hydraulic spring, especially for a cantilever arm of a loading vehicle, has a control unit that monitors the position of a cylinder piston using a sensor and controls a regulatable pressure limiting unit accordingly |
| CN2758541Y (en) * | 2005-01-17 | 2006-02-15 | 江苏华宏科技股份有限公司 | Differential accelerating loop |
| CN102873849A (en) * | 2011-07-11 | 2013-01-16 | 博创机械股份有限公司 | Hydraulic loose core circuit having pressure release function |
| CN102979778A (en) * | 2012-12-07 | 2013-03-20 | 中联重科股份有限公司 | Three-position six-way reversing valve, hydraulic control system and engineering vehicle |
| CN103629175A (en) * | 2013-11-28 | 2014-03-12 | 长沙中联消防机械有限公司 | Working hopper hydraulic control system and engineering vehicle |
| CN204371815U (en) * | 2014-12-11 | 2015-06-03 | 湘电重型装备有限公司 | large electric wheel self-discharging vehicle stair hydraulic control integrated system |
| CN107701529A (en) * | 2017-09-15 | 2018-02-16 | 湖北航天技术研究院总体设计所 | A kind of multi-cylinder has cooperateed with perpendicular hydraulic system |
| CN107934807A (en) * | 2017-12-28 | 2018-04-20 | 徐工集团工程机械有限公司 | The variable amplitude hydraulic system and lorry-mounted crane of crane |
| CN214092512U (en) * | 2020-12-14 | 2021-08-31 | 河北雷萨重型工程机械有限责任公司 | Cantilever crane exhibition is received hydraulic system and pump truck |
| CN113790182A (en) * | 2021-09-22 | 2021-12-14 | 湖南星邦智能装备股份有限公司 | Cantilever crane self-weight retraction control system and control method |
| CN216554696U (en) * | 2022-01-09 | 2022-05-17 | 郑州赫恩斯柯机电设备有限公司 | Integrated valve group for controlling action of hydraulic oil cylinder |
| CN114427553A (en) * | 2022-01-26 | 2022-05-03 | 中国铁建重工集团股份有限公司 | Bundling machine and bale density adjusting and controlling hydraulic system thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102628459B (en) | Multi-oil-cylinder synchronous control system and engineering vehicle | |
| CN104806588B (en) | Dual-pump flow-converging hydraulic control system | |
| CN102887447B (en) | Hydraulic control loop for amplitude-variable hydraulic cylinder, crane and amplitude-variable control method | |
| CN105090154A (en) | Unloading valve block, opening and closing core hydraulic system and engineering machine | |
| CN107934807A (en) | The variable amplitude hydraulic system and lorry-mounted crane of crane | |
| KR20130108266A (en) | Hydraulic drive device for hydraulic work machine | |
| CN211423044U (en) | Closed loop system of differential cylinder | |
| US8966892B2 (en) | Meterless hydraulic system having restricted primary makeup | |
| CN203730423U (en) | Telescoping control loop for hydraulic cylinder and engineering machinery | |
| CN201525715U (en) | Crawler crane anti-back-tilting hydraulic system with function of switching high and low voltage | |
| CN104444893A (en) | Winch control system | |
| CN110307199B (en) | Hydraulic control system | |
| CN202031895U (en) | Oil-way system of a mould locking oil cylinder | |
| CN115059658A (en) | Telescopic oil cylinder hydraulic system and engineering machinery | |
| CN105465077A (en) | Hydraulic system of gear and rack lifting device | |
| CN103174697A (en) | Hydraulic valve system with pressure compensation function | |
| CN215592454U (en) | Rotary buffer valve and crane hydraulic rotary system | |
| CN111503067A (en) | Acceleration pressurization system | |
| CN208087097U (en) | The variable amplitude hydraulic system and lorry-mounted crane of crane | |
| CN111927836B (en) | Hydraulic cylinder control device, variable amplitude hydraulic system and crane | |
| CN114542540A (en) | Flow regeneration hydraulic system and engineering machinery | |
| CN111720376A (en) | Flow dividing valve, hydraulic system thereof and engineering machinery | |
| CN216642610U (en) | Balance valve control circuit, hydraulic control system and working machine | |
| CN110980528A (en) | Novel single-cylinder plug pin type telescopic system and control method | |
| CN215626372U (en) | Counter weight jacking hydraulic system and crane |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |