CN217271186U - Hydraulic control system of stepping mechanism lifting hydraulic cylinder - Google Patents
Hydraulic control system of stepping mechanism lifting hydraulic cylinder Download PDFInfo
- Publication number
- CN217271186U CN217271186U CN202221324370.7U CN202221324370U CN217271186U CN 217271186 U CN217271186 U CN 217271186U CN 202221324370 U CN202221324370 U CN 202221324370U CN 217271186 U CN217271186 U CN 217271186U
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- oil
- valve
- unit
- hydraulic cylinder
- 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.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model discloses metallurgical, forging equipment technical field disclose a stepping mechanism hydraulic cylinder hydraulic control system, the utility model discloses a stepping mechanism hydraulic cylinder hydraulic control system includes: the hydraulic control system comprises an energy accumulator group, a volume speed regulating pump unit, a valve control unit, a reversing valve unit, a back pressure oil supplementing unit and a hydraulic oil tank; one oil port of the volume speed regulation pump unit is connected with the energy accumulator group, the other oil port of the volume speed regulation pump unit is connected with the rodless cavity of the lifting hydraulic cylinder through the valve control unit, and the valve control unit can control the opening and closing of an oil path between the volume speed regulation pump unit and the rodless cavity of the lifting hydraulic cylinder; an oil inlet of the reversing valve unit is connected with the energy accumulator group, an oil outlet of the reversing valve unit is connected with a rod cavity of the lifting hydraulic cylinder, and an oil return port of the reversing valve unit is connected with the back pressure oil supplementing unit. The gravity potential energy utilization system can utilize the gravity potential energy of the lifting hydraulic cylinder for lifting objects, improve the energy utilization efficiency of the hydraulic control system of the lifting hydraulic cylinder, and reduce energy and energy waste.
Description
Technical Field
The utility model discloses metallurgical, forging apparatus technical field, concretely relates to stepping mechanism hydraulic cylinder hydraulic control system.
Background
The stepping mechanism is widely used in mechanical equipment such as a stepping heating furnace, a stepping cooling bed, a stepping conveying chain and the like, and is a continuous motion mechanism which transfers materials forward one by actions such as ascending, advancing, descending, retreating and the like of the mechanism.
The walking beam type heating furnace is widely used for manufacturing heavy complete equipment such as metallurgy and mining machinery, and is particularly used for heating the forged pieces of advanced steel materials before forging or heating the hot rolled pieces before rolling. The stepping mechanism of the stepping heating furnace is generally driven and controlled by a plurality of hydraulic cylinders, the hydraulic cylinders are mainly used for lifting and conveying heavy objects such as steel billets in a stepping manner, the process control requirements of the stepping heating furnace are met, and the stepping mechanism comprises a lifting hydraulic cylinder, a horizontal moving hydraulic cylinder and the like of a furnace bottom machine.
Furnace bottom mechanical lifting hydraulic cylinder for the up-and-down reciprocating motion of flexible drive furnace bottom mechanical marching type, its motion process is: the method comprises the steps of firstly, extending the jacking furnace bottom mechanical bearing steel, secondly, continuing to extend the jacking furnace bottom mechanical bearing steel, thirdly, bearing the furnace bottom mechanical bearing and retracting the steel, and fourthly, after the steel is unloaded, continuing to retract and reset the supporting furnace bottom mechanical. As a typical stepping mechanism lifting hydraulic cylinder, the lifting hydraulic cylinder needs to repeatedly lift and put down dozens of tons or even thousands of tons of weight, and the lifted object has great gravitational potential energy in the process of falling. However, the control of the lifting hydraulic cylinder of the existing furnace bottom machinery is based on the control principle of valve control throttling debugging, and has larger throttling loss. In addition, in some energy-saving technologies, a single-cavity control technology is adopted when the energy accumulator is used for energy recovery, and the problems of oil supplement of a rod cavity and the like are not considered, so that the problems of overlarge capacity, high cost and failure rate and the like of the energy accumulator are caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art exists, the utility model provides a step mechanism hydraulic control system of hydraulic cylinder, its gravitational potential energy that can lift the object to hydraulic cylinder utilizes, improves hydraulic control system of hydraulic cylinder's energy utilization efficiency, reduces energy, the energy is extravagant.
To achieve the above object, the utility model discloses a step mechanism hydraulic lift cylinder hydraulic control system is used for driving hydraulic lift cylinder, and it includes: the hydraulic control system comprises an energy accumulator group, a volume speed regulating pump unit, a valve control unit, a reversing valve unit, a back pressure oil supplementing unit and a hydraulic oil tank; the hydraulic oil tank is used for supplying hydraulic oil to the accumulator group and the back pressure oil supplementing unit; one oil port of the volume speed regulation pump unit is connected with the accumulator group, the other oil port of the volume speed regulation pump unit is connected with the rodless cavity of the lifting hydraulic cylinder through the valve control unit, and the valve control unit can control the oil circuit between the volume speed regulation pump unit and the rodless cavity of the lifting hydraulic cylinder to be closed; the oil inlet of the reversing valve unit is connected with the energy accumulator group, the oil outlet of the reversing valve unit is connected with the rod cavity of the lifting hydraulic cylinder, and the oil return port of the reversing valve unit is connected with the back pressure oil supplementing unit.
In one embodiment, the reversing valve unit comprises a reversing valve and two sets of one-way valves; an oil inlet of the reversing valve is connected with the energy accumulator group, an oil outlet A of the reversing valve is connected with a rod cavity of the lifting hydraulic cylinder, and an oil return port of the reversing valve is connected with the back pressure oil supplementing unit; the one-way valve is connected with the oil outlet A and the oil inlet of the reversing valve, so that hydraulic oil can flow from the oil outlet A to the accumulator group in a one-way mode; the other one-way valve is connected with the oil outlet A and an oil return port of the reversing valve, so that hydraulic oil can flow to the oil outlet A from the back pressure oil supplementing unit in a one-way mode.
In one embodiment, the volume speed regulation pump unit comprises a motor and a hydraulic pump, and is used for performing pump control debugging control on the lifting hydraulic cylinder, the valve control unit comprises a hydraulic valve, the hydraulic valve and the hydraulic pump are correspondingly communicated one by one, one oil port of the hydraulic pump is connected with the energy accumulator group, and the other oil port of the hydraulic pump is connected with the hydraulic valve and is connected with a rodless cavity of the lifting hydraulic cylinder through the hydraulic valve.
In one embodiment, the number of the hydraulic pumps is multiple, the motor drives each hydraulic pump simultaneously, and each hydraulic pump is connected with the rodless cavity of the lifting hydraulic cylinder through the corresponding hydraulic valve.
In one embodiment, the hydraulic valve is a plug-in hydraulic lock.
In one embodiment, the cartridge hydraulic lock comprises a cartridge valve, a shuttle valve and a directional control valve, two main oil ports of the cartridge valve are respectively connected with the hydraulic pump and a rodless cavity of the lifting hydraulic cylinder, two inlets of the shuttle valve are respectively connected with two main oil ports of the cartridge valve, a common oil outlet of the shuttle valve is connected with an oil inlet of the directional control valve, and an oil outlet of the directional control valve is connected with a control port of the cartridge valve.
In one embodiment, an overflow valve is further arranged on a connecting oil path between the hydraulic pump and the hydraulic valve, and the overflow valve is connected with the hydraulic pump and the hydraulic oil tank.
In one embodiment, an oil supplementing oil path is arranged on a connecting oil path between the hydraulic pump and the hydraulic valve, the oil supplementing oil path is connected with an oil pipe between the hydraulic pump and the hydraulic valve and the energy accumulator group, and a pressure reducing valve and an oil supplementing one-way valve are arranged on the oil supplementing oil path, so that hydraulic oil in the energy accumulator group can be sucked into the hydraulic pump after being reduced in pressure by the pressure reducing valve.
The hydraulic control system of the stepping mechanism lifting hydraulic cylinder in the embodiment at least has the following advantages:
(1) when the lifting stepping mechanism of the lifting hydraulic cylinder bears external load, the reversing valve unit can enable a rod cavity of the lifting hydraulic cylinder to be communicated with the energy accumulator group, the volume speed regulation pump unit pressurizes a rodless cavity to drive the lifting hydraulic cylinder to extend, only the relevant gravity and motion resistance of the stepping mechanism need to be overcome, and the energy of the energy accumulator group is kept unchanged; when the stepping mechanism ascends after bearing external load, the reversing valve unit can enable a rod cavity of the lifting hydraulic cylinder to be communicated with the back pressure oil supplementing unit, the pressure of the rod cavity is reduced, and the volume speed regulating pump unit and the energy accumulator group are matched to drive the lifting hydraulic cylinder to extend together; when the stepping mechanism bears external load and descends, the volume speed regulation pump unit changes the flow direction of hydraulic oil, the lifting hydraulic cylinder shrinks and descends under the action of the self weight of the stepping mechanism and the external load gravity, and the back pressure oil supplementing unit supplements the hydraulic oil to the rod cavity. After the external load is unloaded, the reversing valve unit can enable the rod cavity of the lifting hydraulic cylinder to be communicated with the energy accumulator group, the internal pressure of the rod cavity is increased, and the lifting hydraulic cylinder continues to shrink and descend under the combined action of the dead weight of the stepping mechanism. The gravitational potential energy of the lifting object of the lifting hydraulic cylinder is utilized, the energy utilization efficiency of the hydraulic control system of the lifting hydraulic cylinder is improved, and energy waste is reduced.
(2) The one-way valve is arranged between the reversing valve oil outlet A and the rod cavity and between the reversing valve oil outlet A and the back pressure oil supplementing unit, so that when the reversing valve is temporarily closed, hydraulic oil flows into the rod cavity or is supplemented with the oil through the one-way valve, the influence of the reversing process on the pressure in the cylinder of the lifting hydraulic cylinder is reduced, and the unstable stretching speed is avoided.
(3) The volume speed regulation pump unit can meet the synchronous control requirements of a plurality of hydraulic cylinders, reduces the use of control valves and simplifies the control structure; the motor drives each hydraulic pump simultaneously, is convenient for control the operating mode of each hydraulic pump simultaneously, simplifies the hydraulic pump control structure.
(4) The cartridge type hydraulic lock can be locked by using the driving oil of the lifting hydraulic cylinder when the lifting hydraulic cylinder extends or retracts through the cartridge valve, the shuttle valve and the direction control valve, and a control oil path is simplified. The overflow valve controls the pressure of the volume speed-regulating pump unit on the control oil of the lifting hydraulic cylinder, so that the unstable expansion and contraction speed is avoided. The oil supplementing oil circuit leads the connecting oil port of the hydraulic pump and the rod cavity to always keep an oil supplementing pressure through the pressure reducing valve and the oil supplementing one-way valve, and the hydraulic pump does not suck air.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
Fig. 1 is a schematic diagram of a hydraulic control system of a stepping mechanism lifting hydraulic cylinder according to an embodiment of the present invention;
reference numerals:
1-lifting hydraulic cylinder, 2-accumulator group, 3-back pressure oil supplementing unit, 4-hydraulic oil tank, 5-volume speed regulation pump group unit, 51-motor, 52-hydraulic pump, 6-valve control unit, 61-hydraulic valve, 611-cartridge valve, 612-shuttle valve, 613-directional control valve, 62-overflow valve, 63-oil supplementing oil way, 631-pressure reducing valve, 632-oil supplementing one-way valve, 7-reversing valve unit, 71-reversing valve, 711-oil outlet A, 72-one-way valve.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only used as examples, and the protection scope of the present invention is not limited thereby. It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
In the description of the present application, it is to be understood that the meaning of "a plurality" is two or more unless specifically limited otherwise. Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a hydraulic control system of a stepping mechanism hydraulic cylinder in an embodiment includes an energy accumulator group 2, a volumetric speed-regulating pump unit 5, a valve control unit 6, a reversing valve unit 7, a back pressure oil supplementing unit 3, and a hydraulic oil tank 4, and is configured to drive the hydraulic cylinder 1, so that gravitational potential energy of the hydraulic cylinder 1 lifting an object can be utilized, energy utilization efficiency of the hydraulic control system of the hydraulic cylinder is improved, and energy waste is reduced.
Specifically, the hydraulic oil tank 4 is used to supply hydraulic oil to the accumulator group 2 and the back pressure oil supply unit 3. The hydraulic oil tank 4 is a common hydraulic oil tank. The hydraulic tank 4 is shown simplified in the drawing as a T-pipe. The accumulator group 2 is composed of a plurality of accumulators connected in parallel. The accumulator battery 2 is shown simplified in the drawing with P-tubes. The hydraulic oil tank 4 can supply oil to the accumulator group 2 and supply hydraulic oil by means of an oil supply pump and the like. Reference is made to the prior art for a specific manner. The back pressure oil supplementing unit 3 can be cooling circulating oil with back pressure, and can be realized by connecting a hydraulic oil circulation cooling device in the prior art with a hydraulic oil tank 4. The back pressure oil supply unit 3 is shown in a simplified form by an M-tube in the drawing. It can be understood that the back pressure oil supplementing unit 3 serves as an oil supplementing device, and the oil supplementing pressure of the back pressure oil supplementing unit 3 is smaller than the working pressure of the accumulator.
One oil port of the volume speed regulation pump unit 5 is connected with the accumulator group 2, and the other oil port of the volume speed regulation pump unit 5 is connected with the rodless cavity of the lifting hydraulic cylinder 1 through the valve control unit 6. The valve control unit 6 can control the oil circuit between the volume speed regulation pump unit 5 and the rodless cavity of the lifting hydraulic cylinder 1 to be closed. An oil inlet of the reversing valve unit 7 is connected with the energy accumulator group 2, an oil outlet of the reversing valve unit 7 is connected with a rod cavity of the lifting hydraulic cylinder 1, and an oil return port of the reversing valve unit 7 is connected with the back pressure oil supplementing unit 3. Specifically, the variable speed displacement pump unit 5 includes an electric motor 51 and a hydraulic pump 52. And the device is used for carrying out pump control debugging control on the lifting hydraulic cylinder 1. The valve control unit 6 comprises hydraulic valves 61, and the hydraulic valves 61 are communicated with the hydraulic pumps 52 in a one-to-one correspondence mode. One oil port of the hydraulic pump 52 is connected with the accumulator group 2, and the other oil port of the hydraulic pump 52 is connected with the hydraulic valve 61 and is connected with the rodless cavity of the lifting hydraulic cylinder 1 through the hydraulic valve 61. Referring to fig. 1, a port a of the hydraulic pump 52 is connected to the hydraulic valve 61, and a port B of the hydraulic pump 52 is used for connecting to the accumulator group 2 (not shown in the connection management diagram). The volume speed regulating pump unit 5 controls the flow and pressure of hydraulic oil through the rotating speed of the motor 51 and the displacement of the hydraulic pump 52; the flow direction of the hydraulic oil is controlled by the steering of the motor 51 or the displacement reversal of the hydraulic pump 52. When the lifting stepping mechanism of the lifting hydraulic cylinder 1 bears external load, the reversing valve unit 7 can enable the rod cavity of the lifting hydraulic cylinder 1 to be communicated with the energy accumulator group 2, and the volume speed regulating pump unit 5 pressurizes the rodless cavity to drive the lifting hydraulic cylinder 1 to extend. The volumetric speed-regulating pump unit 5 only needs to overcome the relevant gravity and motion resistance of the stepping mechanism, the hydraulic oil quantity of the energy accumulator group 2 is kept unchanged theoretically, and the energy accumulation energy is kept unchanged. When the stepping mechanism ascends after bearing external load, the reversing valve unit 7 can enable a rod cavity of the lifting hydraulic cylinder 1 to be communicated with the back pressure oil supplementing unit 3, the pressure of the rod cavity is reduced, and the volume speed regulating pump unit 5 and the energy accumulator group 2 are matched to drive the lifting hydraulic cylinder 1 to extend together. When the stepping mechanism bears external load and descends, the volume speed regulating pump unit 5 changes the flow direction of hydraulic oil, the lifting hydraulic cylinder 1 contracts and descends under the action of the self weight of the stepping mechanism and the gravity of the external load, the pressure in the rod cavity is reduced, and the back pressure oil supplementing unit 3 supplements the hydraulic oil to the rod cavity. After the external load is unloaded, the reversing valve unit 7 can enable the rod cavity of the lifting hydraulic cylinder 1 to be communicated with the energy accumulator group 2, the internal pressure of the rod cavity is increased, and the lifting hydraulic cylinder 1 continues to shrink and descend under the combined action of the dead weight of the stepping mechanism. The gravitational potential energy of the lifting object of the lifting hydraulic cylinder 1 is utilized, the corresponding gravitational potential energy is utilized to supplement oil to the control oil way, the energy utilization efficiency of the hydraulic control system of the lifting hydraulic cylinder 1 is improved, and energy waste is reduced. When the hydraulic lifting cylinder 1 needs to be decelerated in the material receiving process, the rotating speed of the motor 51 can be reduced or the displacement of the hydraulic pump 52 can be reduced to realize speed control, so that the whole stepping mechanism can realize the desired lifting position and speed control.
In one embodiment, a relief valve 62 is further provided on a connection path between the hydraulic pump 52 and the hydraulic valve 61, and the relief valve 62 connects the hydraulic pump 52 and the hydraulic tank 4. The overflow valve 62 controls the pressure of the control oil of the volumetric speed-regulating pump unit 5 on the lifting hydraulic cylinder 1, so as to avoid the unstable expansion and contraction speed. In one embodiment, an oil supply passage 63 is provided in a connection passage between the hydraulic pump 52 and the hydraulic valve 61. The oil supply passage 63 connects the oil pipe between the hydraulic pump 52 and the hydraulic valve 61 and the accumulator group 2. The oil supply passage 63 is provided with a pressure reducing valve 631 and an oil supply check valve 632, so that the hydraulic oil in the accumulator group 2 can be reduced in pressure by the pressure reducing valve 631 and then sucked into the hydraulic pump 52. The oil supplementing oil path 63 keeps an oil supplementing pressure at a connecting oil port of the hydraulic pump 52 and the rod cavity all the time through the pressure reducing valve 631 and the oil supplementing check valve 632, and the hydraulic pump 52 is not sucked empty.
In one embodiment, the directional valve unit 7 includes a directional valve 71 and two sets of check valves 72. An oil inlet of the reversing valve 71 is connected with the energy accumulator group 2, an oil outlet A711 of the reversing valve 71 is connected with a rod cavity of the lifting hydraulic cylinder 1, and an oil return port of the reversing valve 71 is connected with the back pressure oil supplementing unit 3. And a one-way valve 72 is connected with the oil outlet A711 and the oil inlet of the reversing valve 71, so that the hydraulic oil can flow from the oil outlet A711 to the accumulator group 2 in a one-way mode. The other one-way valve 72 is connected with the oil outlet a711 and an oil return port of the reversing valve 71, so that the hydraulic oil can flow from the back pressure oil supplementing unit 3 to the oil outlet a711 in a one-way mode. The reversing valve 71 can be a two-position three-way reversing valve or a two-position four-way reversing valve, and the like, and can selectively enable a rod cavity of the lifting hydraulic cylinder 1 to be communicated with the energy accumulator group 2 or the back pressure oil supplementing unit 3. The one-way valve 72 is arranged between the oil outlet A711 of the reversing valve 71 and the rod cavity and back pressure oil supplementing unit 3, so that when the reversing valve 71 is temporarily closed in the reversing process, hydraulic oil can flow into the rod cavity or supplement oil through the one-way valve 72, the influence of the reversing process on the pressure in the cylinder of the lifting hydraulic cylinder 1 is reduced, and the unstable stretching speed is avoided. In the first embodiment, the number of the hydraulic pumps 52 is plural, the motors 51 drive the respective hydraulic pumps 52 simultaneously, and the respective hydraulic pumps 52 are connected to the rodless chamber of the hydraulic lift cylinder 1 through the corresponding hydraulic valves 61 in common. The volume speed regulation pump unit 5 can meet the synchronous control requirements of a plurality of hydraulic cylinders, reduces the use of control valves and simplifies the control structure. The motor 51 drives the hydraulic pumps 52 simultaneously, so that the working conditions of the hydraulic pumps 52 can be controlled simultaneously, and the control structure of the hydraulic pumps 52 is simplified.
In one embodiment, the hydraulic valve 61 is a cartridge hydraulic lock. After the lifting hydraulic cylinder 1 is lifted to the right position, the plug-in hydraulic lock cuts off a hydraulic loop, and the lifting hydraulic cylinder 1 is locked at a high position for waiting. Specifically, the cartridge hydraulic lock includes a cartridge valve 611, a shuttle valve 612, and a directional control valve 613. The two main ports of the cartridge valve 611 are connected to the hydraulic pump 52 and the rodless chamber of the hydraulic cylinder 1, respectively. Two inlets of the shuttle valve 612 are respectively connected with two main oil ports of the cartridge valve 611, and a common oil outlet of the shuttle valve 612 is connected with an oil inlet of the directional control valve 613. An outlet port of the directional control valve 613 is connected to the control port of the cartridge valve 611. The cartridge type hydraulic lock can be locked by the drive oil of the hydraulic lift cylinder 1 during extension and retraction of the hydraulic lift cylinder 1 through the cartridge valve 611, the shuttle valve 612, and the directional control valve 613, thereby simplifying the control oil path. It is understood that the hydraulic valve 61 may also be a hydraulic valve, an electric control valve, or the like capable of controlling the opening and closing of the oil passage, such as a switching valve, a plate-type pilot-controlled check valve, or the like.
According to the hydraulic control system of the stepping mechanism lifting hydraulic cylinder in the embodiment, when the lifting stepping mechanism of the lifting hydraulic cylinder 1 bears external load, the reversing valve unit 7 can enable the rod cavity of the lifting hydraulic cylinder 1 to be communicated with the energy accumulator group 2, and the volume speed regulating pump unit 5 pressurizes the rodless cavity to drive the lifting hydraulic cylinder 1 to extend. The volumetric speed-regulating pump unit 5 only needs to overcome the relevant gravity and motion resistance of the stepping mechanism, the hydraulic oil quantity of the energy accumulator group 2 is kept unchanged theoretically, and the energy accumulation energy is kept unchanged. When the stepping mechanism ascends after bearing external load, the reversing valve unit 7 can enable a rod cavity of the lifting hydraulic cylinder 1 to be communicated with the back pressure oil supplementing unit 3, the pressure of the rod cavity is reduced, and the volume speed regulating pump unit 5 and the energy accumulator group 2 are matched to drive the lifting hydraulic cylinder 1 to extend together. When the stepping mechanism bears external load and descends, the volume speed regulating pump unit 5 changes the flow direction of hydraulic oil, the lifting hydraulic cylinder 1 contracts and descends under the action of the self weight of the stepping mechanism and the external load gravity, the internal pressure of the rod cavity is reduced, and the back pressure oil supplementing unit 3 supplements the hydraulic oil to the rod cavity. After the external load is unloaded, the reversing valve unit 7 can enable the rod cavity of the lifting hydraulic cylinder 1 to be communicated with the energy accumulator group 2, the internal pressure of the rod cavity is increased, and the lifting hydraulic cylinder 1 continues to shrink and descend under the combined action of the dead weight of the stepping mechanism. The gravitational potential energy of the lifting object of the lifting hydraulic cylinder 1 is utilized, the corresponding gravitational potential energy is utilized to supplement oil to the control oil way, the energy utilization efficiency of the hydraulic control system of the lifting hydraulic cylinder 1 is improved, and energy waste is reduced.
According to the hydraulic control system of the stepping mechanism lifting hydraulic cylinder in the above embodiment, the utility model also provides a hydraulic control method of the stepping mechanism lifting hydraulic cylinder, the hydraulic control method of the stepping mechanism lifting hydraulic cylinder 1 in an embodiment includes the following steps:
s1, the hydraulic lift cylinder 1 is at the stage of rising against the self-weight of the step mechanism. The volume speed regulating pump unit 5 is controlled to enable hydraulic oil to flow into a rodless cavity of the lifting hydraulic cylinder 1, the reversing valve unit 7 is controlled to enable a rod cavity of the lifting hydraulic cylinder 1 to be communicated with the energy accumulator group 2, and the hydraulic oil in the rod cavity flows back to the energy accumulator group 2. Specifically, the volume speed regulating pump unit 5 controls the flow and pressure of hydraulic oil through the rotating speed of the motor 51 and the displacement of the hydraulic pump 52; the flow direction of the hydraulic oil is controlled by the steering of the electric motor 51 or the displacement reversing of the hydraulic pump 52. The volume speed regulation pump unit 5 only needs to do work to overcome the relevant gravity and motion resistance of the stepping mechanism, the hydraulic oil quantity of the energy accumulator group 2 is kept unchanged theoretically, and the energy accumulation energy is kept unchanged.
S2, the hydraulic cylinder 1 continues to be raised to receive the applied load. The reversing valve unit 7 is controlled to enable the rod cavity of the lifting hydraulic cylinder 1 to be communicated with the backpressure oil supplementing unit 3, and the backpressure of the rod cavity is reduced. The volume speed regulation pump unit 5 and the energy accumulator group 2 are matched to jointly drive the lifting hydraulic cylinder 1 to extend, and hydraulic oil in the rod cavity flows to the back pressure oil supplementing unit 3. After the lifting hydraulic cylinder 1 rises to the right position, the valve control unit 6 is utilized to disconnect the volume speed regulation pump unit 5 and the rodless cavity of the lifting hydraulic cylinder 1. The backpressure of the rod cavity is reduced, the work applying requirement on the volume speed regulating pump unit 5 is reduced, and the energy consumption of the system is reduced.
And S3, the lifting hydraulic cylinder 1 is in a descending stage of bearing an external load. And the valve control unit 6 is used for communicating the volume speed regulation pump unit 5 with the rodless cavity of the lifting hydraulic cylinder 1 again. The volume speed regulation pump unit 5 is controlled to change the flow direction of hydraulic oil, the lifting hydraulic cylinder 1 contracts under the action of the gravity of a load, and the hydraulic oil in the rodless cavity is sent back to the energy accumulator group 2. The back pressure oil supplementing unit 3 supplements hydraulic oil to the rod cavity.
S4, after the external load is unloaded, the reversing valve unit 7 is controlled to enable the rod cavity of the lifting hydraulic cylinder 1 to be communicated with the energy accumulator group 2, the pressure in the rod cavity is increased, and under the self-weight action of the stepping mechanism, hydraulic oil in the rod-free cavity flows into the energy accumulator group 2 through the volume speed regulating pump unit 5, so that the lifting hydraulic cylinder 1 continues to shrink, descend and reset. Specifically, the control method further comprises the step of controlling the rotation speed and the steering direction of the motor 51 of the volume speed regulating pump unit 5 and the displacement of the hydraulic pump 52 to perform contraction speed control.
In the hydraulic control method for the stepping mechanism lifting hydraulic cylinder in the embodiment, the hydraulic oil in the rodless cavity of the lifting hydraulic cylinder 1 is controlled by the volume speed regulating pump unit 5, the hydraulic oil in the rod cavity of the lifting hydraulic cylinder 1 is controlled by the reversing valve unit 7, and the gravitational potential energy of the lifting object of the lifting hydraulic cylinder 1 is utilized by matching with the energy accumulator group 2, so that the energy utilization efficiency of the hydraulic control system of the lifting hydraulic cylinder 1 is improved, and the energy and energy waste is reduced.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included in the scope of the claims and description of the present invention.
Claims (8)
1. A hydraulic control system of a stepping mechanism lifting hydraulic cylinder is used for driving the lifting hydraulic cylinder and is characterized by comprising: the system comprises an energy accumulator group, a volume speed regulating pump group unit, a valve control unit, a reversing valve unit, a back pressure oil supplementing unit and a hydraulic oil tank; the hydraulic oil tank is used for supplying hydraulic oil to the accumulator group and the back pressure oil supplementing unit; one oil port of the volume speed regulation pump unit is connected with the accumulator group, the other oil port of the volume speed regulation pump unit is connected with the rodless cavity of the lifting hydraulic cylinder through the valve control unit, and the valve control unit can control the oil circuit between the volume speed regulation pump unit and the rodless cavity of the lifting hydraulic cylinder to be closed; the oil inlet of the reversing valve unit is connected with the energy accumulator group, the oil outlet of the reversing valve unit is connected with the rod cavity of the lifting hydraulic cylinder, and the oil return port of the reversing valve unit is connected with the back pressure oil supplementing unit.
2. The stepper-mechanism lift cylinder hydraulic control system of claim 1, wherein the directional valve unit includes a directional valve and two sets of one-way valves; an oil inlet of the reversing valve is connected with the energy accumulator group, an oil outlet A of the reversing valve is connected with a rod cavity of the lifting hydraulic cylinder, and an oil return port of the reversing valve is connected with the back pressure oil supplementing unit; the one-way valve is connected with the oil outlet A and the oil inlet of the reversing valve, so that hydraulic oil can flow from the oil outlet A to the accumulator group in a one-way mode; the other one-way valve is connected with the oil outlet A and an oil return port of the reversing valve, so that hydraulic oil can flow to the oil outlet A from the back pressure oil supplementing unit in a one-way mode.
3. The hydraulic control system of the stepping mechanism lifting hydraulic cylinder according to claim 1, wherein the volume speed regulation pump unit comprises a motor and a hydraulic pump for performing pump control debugging control on the lifting hydraulic cylinder, the valve control unit comprises a hydraulic valve, the hydraulic valve and the hydraulic pump are communicated in a one-to-one correspondence manner, one oil port of the hydraulic pump is connected with the accumulator group, and the other oil port of the hydraulic pump is connected with the hydraulic valve and is connected with the rodless cavity of the lifting hydraulic cylinder through the hydraulic valve.
4. The system of claim 3, wherein the number of the hydraulic pumps is plural, the motor drives each of the hydraulic pumps at the same time, and each of the hydraulic pumps is connected to the rodless chamber of the hydraulic lift cylinder through a corresponding one of the hydraulic valves.
5. The hydraulic control system of a stepper-mechanism lift cylinder as defined in claim 3, wherein: the hydraulic valve is a plug-in hydraulic lock.
6. The hydraulic control system of a stepper-mechanism lift cylinder as defined in claim 5, wherein: the cartridge hydraulic lock comprises a cartridge valve, a shuttle valve and a directional control valve, two main oil ports of the cartridge valve are respectively connected with the hydraulic pump and a rodless cavity of the lifting hydraulic cylinder, two inlets of the shuttle valve are respectively connected with the two main oil ports of the cartridge valve, a public oil outlet of the shuttle valve is connected with an oil inlet of the directional control valve, and an oil outlet of the directional control valve is connected with a control port of the cartridge valve.
7. The hydraulic control system of the stepping mechanism lifting hydraulic cylinder according to claim 3, wherein an overflow valve is further arranged on a connecting oil path between the hydraulic pump and the hydraulic valve, and the overflow valve is connected with the hydraulic pump and the hydraulic oil tank.
8. The hydraulic control system of the stepping mechanism lifting hydraulic cylinder according to claim 3, wherein an oil supplementing oil path is arranged on a connecting oil path between the hydraulic pump and the hydraulic valve, the oil supplementing oil path is connected with an oil pipe between the hydraulic pump and the hydraulic valve and the energy accumulator group, and a pressure reducing valve and an oil supplementing check valve are arranged on the oil supplementing oil path, so that hydraulic oil in the energy accumulator group can be reduced in pressure by the pressure reducing valve and then is sucked into the hydraulic pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221324370.7U CN217271186U (en) | 2022-05-30 | 2022-05-30 | Hydraulic control system of stepping mechanism lifting hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221324370.7U CN217271186U (en) | 2022-05-30 | 2022-05-30 | Hydraulic control system of stepping mechanism lifting hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217271186U true CN217271186U (en) | 2022-08-23 |
Family
ID=82887997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221324370.7U Active CN217271186U (en) | 2022-05-30 | 2022-05-30 | Hydraulic control system of stepping mechanism lifting hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217271186U (en) |
-
2022
- 2022-05-30 CN CN202221324370.7U patent/CN217271186U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102134047B (en) | Energy-saving hydraulic system of electric forklift | |
| CN112901570B (en) | Electro-hydraulic actuating system applied to hydraulic press | |
| CN113251013B (en) | Electro-hydraulic direct-drive servo closed differential control driving system of stepping lifting mechanism | |
| CN113148914A (en) | Forklift potential energy recovery and release integrated device and working method | |
| CN108978774B (en) | Series-parallel hybrid power system for excavator | |
| CN107700576B (en) | Kinetic potential energy recycling system of hydraulic excavator | |
| CN116240941A (en) | Servo pump control system for excavator movable arm and energy regulation and control method | |
| CN101592026A (en) | A kind of novel energy-conserving hydraulic pumping unit | |
| CN214570507U (en) | Device integrating potential energy recovery and release of forklift | |
| CN217271186U (en) | Hydraulic control system of stepping mechanism lifting hydraulic cylinder | |
| CN209875620U (en) | Transmission system of stepping mechanism and energy recovery system thereof | |
| CN110056549B (en) | Automatic control lifting hydraulic cylinder potential energy recovery system and method | |
| CN110030235B (en) | Transmission system of stepping mechanism and energy recovery system thereof | |
| CN108468672B (en) | Energy-saving hydraulic system of stepping heating furnace | |
| CN114791008A (en) | Hydraulic control system and method for lifting hydraulic cylinder of stepping mechanism | |
| CN115839364A (en) | Potential energy recovery device of hydraulic system of stepping heating furnace | |
| CN217735865U (en) | Hydraulic control system for translation hydraulic cylinder of stepping mechanism | |
| CN201962039U (en) | Energy-saving hydraulic system of electronic forklift | |
| CN201460907U (en) | Energy recovery device in shield segment assembly driving system | |
| CN210978074U (en) | Energy recycling device | |
| CN219242329U (en) | Closed hydraulic system of double-pump hydraulic pumping unit | |
| CN108591189B (en) | Variable-parameter energy accumulator control system and movable arm energy-saving hydraulic system | |
| CN108483264B (en) | The hydraulic control system and hoisting machinery of hoisting machinery | |
| CN114505438B (en) | High-power electro-hydraulic control press machine system | |
| CN217152464U (en) | Hydraulic machine energy recovery system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |