CN113530901B - Direct energy storage type hydraulic control system of negative load - Google Patents
Direct energy storage type hydraulic control system of negative load Download PDFInfo
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- CN113530901B CN113530901B CN202111079013.9A CN202111079013A CN113530901B CN 113530901 B CN113530901 B CN 113530901B CN 202111079013 A CN202111079013 A CN 202111079013A CN 113530901 B CN113530901 B CN 113530901B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 54
- 230000001105 regulatory effect Effects 0.000 claims abstract description 47
- 238000005381 potential energy Methods 0.000 claims abstract description 25
- 230000001502 supplementing effect Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 51
- 230000008569 process Effects 0.000 claims description 46
- 230000002457 bidirectional effect Effects 0.000 claims description 20
- 230000001174 ascending effect Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 16
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 description 5
- 239000013589 supplement Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009776 industrial production 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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
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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
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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Abstract
The invention provides a direct-load energy storage type hydraulic control system, which structurally comprises an energy storage device, a lifting cylinder control valve group, a translation cylinder control valve group and a hydraulic power device, wherein the energy storage device is connected with the lifting cylinder control valve group through a ball valve, the lifting cylinder control valve group is connected with the translation cylinder control valve group in parallel and is simultaneously connected with the hydraulic power device, the energy storage device comprises a high-pressure energy accumulator group, a low-pressure energy accumulator group and an energy supplementing and pressure limiting valve group, the high-pressure energy accumulator group and the low-pressure energy accumulator group are respectively connected with the hydraulic power device through the ball valve, and the energy supplementing and pressure limiting valve group is simultaneously connected with the high-pressure energy accumulator group and the low-pressure energy accumulator group. The invention selects the electric proportional variable pump, adopts the two-way proportional speed regulating valve group to realize the direct energy storage of the negative load, saves a potential energy conversion device and an oil supplementing power device compared with the conventional energy-saving working mode, simplifies the control flow, effectively reduces the cost and saves the energy consumption.
Description
Technical Field
The invention relates to a direct-load energy storage type hydraulic control system, and belongs to the technical field of hydraulic control.
Background
In industrial production, there are many mechanisms for lifting and dropping objects. In the process of lifting the object, the object must be acted by overcoming the action of gravity; in the falling process of the object, the object has larger potential energy, the object can naturally fall without any external force, but the object can fall according to a certain rule, and the purpose can be achieved only by paying work (potential energy balance work) which is equal to and opposite to the potential energy of the object. The falling process of the motor dragging is generally realized by adopting friction braking; for the falling process of hydraulic dragging, the potential energy is called load energy, and is generally realized by arranging a throttle valve or a balance valve in a load oil return cavity of a hydraulic cylinder. The force applied to the actuating element of the hydraulic system is called load, when the actuating element has a tendency of doing work on the mechanical equipment, the force applied to the actuating element is called positive load, and when the mechanical equipment has a tendency of doing work on the actuating element, the force applied to the actuating element is called negative load.
At present, the energy-saving technology of hydraulic control of a movement mechanism of a stepping heating furnace mainly adopts a potential energy conversion and energy storage type energy-saving hydraulic control system, and the schematic diagram of the principle is shown in figure 1: the system mainly comprises a hydraulic power device, an oil supplementing hydraulic power device, a lifting cylinder control loop, a potential energy conversion device, an energy storage device and a translation cylinder control loop, wherein the power device is characterized in that a constant-pressure variable pump is selected; the control loop is characterized in that a proportional direction speed regulating valve and a balance valve are adopted; the technical characteristic of potential energy recovery is that a method of potential energy conversion and energy storage is adopted.
However, in the actual operation process, the defects existing in the control system gradually appear as follows: 1) the system adopts a proportional reversing valve and a pressure compensator to form a proportional direction speed regulating valve, belongs to the inlet side speed control of a hydraulic cylinder, can not exert the function of return oil throttling on a mechanism with larger load and larger inertia, needs additional elements for realizing stable stop, and is used for manually switching a ball valve under the condition that the operation is required to be stopped when the energy-saving operation is converted into the energy consumption method operation. The operation cost is increased to a certain extent; 2) a balance valve is adopted to balance the load, and the opening pressure of 2-3 MPa needs to be additionally increased, so that the energy consumption of the system is improved; 3) according to the energy conservation principle, hydraulic energy loss is inevitably generated in the hydraulic energy conversion process of the potential energy conversion device, the structure volume of the potential energy conversion device is large, the occupied area is wide, and an oil supplementing device is required to be added for filling and supplementing liquid for the potential energy conversion device, so that the operation and maintenance cost of enterprises is increased; 4) when the proportional reversing speed regulating valve is operated by an energy-saving operation method and an energy consumption method, the difference of the flow passing through the proportional reversing speed regulating valve is large, so that the control current of the proportional valve is greatly changed, and great inconvenience is brought to the programming and the daily maintenance of a control program.
Disclosure of Invention
The invention aims to overcome the defects of the existing potential energy conversion and energy storage type energy-saving hydraulic control system, provides a negative load direct energy storage type hydraulic control system, and fundamentally solves the problems of high operation cost and poor energy-saving efficiency of the existing hydraulic control system.
The technical solution of the invention is as follows: a direct energy storage type hydraulic control system of load structurally comprises an energy storage device, a lifting cylinder control valve group, a translation cylinder control valve group and a hydraulic power device, wherein the energy storage device is connected with the lifting cylinder control valve group through a ball valve; the energy storage device comprises a high-pressure energy accumulator group, a low-pressure energy accumulator group and an energy supplementing pressure limiting valve group, wherein the high-pressure energy accumulator group and the low-pressure energy accumulator group are respectively connected with the hydraulic power device through ball valves, and the energy supplementing pressure limiting valve group is simultaneously connected with the high-pressure energy accumulator group and the low-pressure energy accumulator group.
Further, the high pressure accumulator bank includes a high pressure accumulator, a pressure sensor PX1, a directional valve YX1, and YX 2; the switching-over valves YX1 and YX2 are respectively arranged at two sides of the high-pressure accumulator, and the pressure sensor PX1 is arranged between the high-pressure accumulator and the switching-over valve YX 2; the low pressure accumulator bank includes a low pressure accumulator, a pressure sensor PX2, a directional valve YX3, and YX 4; the reversing valves YX3 and YX4 are respectively arranged at two sides of the low-pressure accumulator, and the pressure sensor PX2 is arranged between the low-pressure accumulator and the reversing valve YX 4; the energy supplementing pressure limiting valve group is simultaneously connected with the high-pressure accumulator group and the low-pressure accumulator group and is connected with the hydraulic power device through the reversing valve YX5, so that the potential energy can be recovered in a grading manner according to the load change rule.
Further, the lifting cylinder control valve group is connected with a lifting cylinder and specifically comprises a two-way proportional speed regulating valve group YBS, a reversing valve YS3 and a three-position four-way electromagnetic reversing valve YS 1; one end interface of the lifting oil cylinder is connected with a two-way proportional speed regulating valve set YBS, the two-way proportional speed regulating valve set YBS is connected with one end of a three-position four-way electromagnetic reversing valve YS1 through a reversing valve YS3, and the other end of the three-position four-way electromagnetic reversing valve YS1 is connected with the other end interface of the lifting oil cylinder. The translation cylinder control valve group is connected with a translation cylinder and specifically comprises a two-way proportional speed regulating valve group YBP, a bridge two-way bottom plate and a three-position four-way electromagnetic directional valve YP 1; one end interface of the translation oil cylinder is connected with a two-way proportional speed regulating valve set YBP, the two-way proportional speed regulating valve set YBP is connected with a three-position four-way electromagnetic reversing valve YP1 through a bridge type two-way bottom plate, and the bridge type two-way bottom plate is simultaneously connected with the other end interface of the translation oil cylinder.
Further, the hydraulic power device comprises a pressure sensor PB, an electric proportional variable pump, an oil tank, a reversing valve YB1 and a reversing valve YB 2; the multi-group parallel electric proportional variable pumps are respectively connected with an oil tank, a pressure sensor PB is connected with the oil tank through a reversing valve YB1, the oil tank is simultaneously connected with a high-pressure energy accumulator group and a low-pressure energy accumulator group through a reversing valve YB2, and is simultaneously connected with a three-position four-way electromagnetic reversing valve YS1 in the lifting cylinder control valve group and a three-position four-way electromagnetic reversing valve YP1 in the translation cylinder control valve group.
The specific working process of the system is as follows:
1) before the first rise, the hydraulic power device sucks oil from the oil tank, and the oil is charged to the high-pressure accumulator group and the low-pressure accumulator group through the electricity obtained by the reversing valve YX 5; when the pressure of the accumulator group reaches the set values of the pressure sensors PX1 and PX2, the reversing valve YX5 is de-energized to complete the liquid charging process;
2) after receiving the ascending signal, the reversing valves YS1, YS3, YX3 and the bidirectional proportional speed regulating valve bank YBS are powered on simultaneously, the hydraulic power device sucks pressure oil from the low-pressure energy accumulator bank, the rodless cavity of the lifting oil cylinder is supplied with the oil through the reversing valves YS1 and YS3 and the bidirectional proportional speed regulating valve bank YBS, and the oil in the cavity with the rod returns to the oil tank through the reversing valve YS1, so that the processes of low-pressure energy storage release and light-load half-stroke extension are completed; after receiving the position signal, the reversing valve YX3 is de-energized, the reversing valve YX1 is energized, the hydraulic power device sucks pressure oil from the high-pressure energy accumulator group, the oil is continuously supplied to the rodless cavity of the lifting oil cylinder through the reversing valves YS1 and YS3 and the bidirectional proportional speed regulating valve YBS, and the oil with the rod cavity returns to the oil tank through the reversing valve YS1, so that the processes of high-pressure energy storage release and heavy-load half-stroke extension are completed, all the related energized elements are de-energized, and at the moment, all the processes of rising and energy storage device energy release are completed;
3) after the discharging of the translation cylinder is finished, the descending process is started: after receiving the descending signal, the reversing valves YS1, YX2 and the bidirectional proportional speed regulating valve bank YBS are simultaneously powered on, the hydraulic power device sucks oil from the oil tank, the oil is supplied to the rodless cavity of the lifting cylinder through the reversing valve YS1, and the oil in the rod cavity simultaneously enters the high-pressure accumulator bank through the bidirectional proportional speed regulating valve bank YBS and the reversing valve YX2, so that the heavy load half-stroke retraction and high-pressure energy storage processes are completed; after receiving the position command signal, the reversing valve YX2 is de-energized, the reversing valve YX4 is energized, the hydraulic power device sucks oil from the oil tank, oil is continuously supplied to the rodless cavity of the lifting cylinder through the reversing valve YS1, oil in the cavity with the rod enters the low-pressure accumulator group through the YBS and the YX4 simultaneously, so that the light-load half-stroke retraction and low-pressure energy storage processes are completed, all the related energized elements are de-energized, all the descending and energy storage processes are completed at the moment, and the energy required by the processes is used in the ascending process of the next cycle.
Compared with the prior art, the invention has the advantages that:
1) the hydraulic power device selects an electric proportional variable pump for a closed transmission system, the pump has the characteristic of high allowable pressure of an oil suction port, and simultaneously has the characteristic of adjustable constant pressure variable: the conventional constant-pressure variable pump always sets a constant-pressure variable pressure value by taking the highest pressure loop as a reference regardless of the required pressure of a loop, and consumes partial pressure of a pump source in a throttling mode of increasing flow resistance when a low-pressure loop works so as to adapt to the requirement of the loop, and the flow resistance is finally converted into redundant heat, so that energy waste is caused; the characteristic of adjustable constant pressure variable can set different constant pressure variable points according to the pressure requirement of each loop of the system, the pressure of a pump source is not required to be consumed in a throttling mode of increasing flow resistance, and the pump is more energy-saving than a common constant pressure variable pump;
2) the lifting cylinder and the translation cylinder control loop are designed by adopting the technical characteristics disclosed in 'a bidirectional speed regulation hydraulic control system (patent number ZL 201920530719.4) based on a hydraulic cylinder negative load oil return cavity': for a control loop of a lifting cylinder, a bidirectional proportional regulating valve is arranged in a negative load oil return cavity (rodless cavity), so that the bidirectional speed regulating function can be realized, the function of the speed regulating valve for simulating a negative load can be fully exerted when the lifting cylinder descends, the function of a balance valve is realized, and the opening pressure of the balance valve, which is required by 2-3 MPa, does not need to be increased; for a control loop of the translation cylinder, a bidirectional proportional regulating valve is arranged in a rod cavity, so that the bidirectional speed regulating effect can be achieved, the back pressure is increased when an oil inlet piston rod of the rod cavity extends out (belongs to a heavy load working stroke), inertia is planned when the heavy load running process is finished, the stop position is ensured to be accurate, the energy is saved, and the integral running stability of a control system is ensured;
3) the energy storage device realizes the graded potential energy recovery according to the load change rule by arranging the high-pressure and low-pressure energy accumulator groups and the control valve, skillfully utilizes the characteristic of the pressure reducing valve by arranging the energy supplementing pressure limiting valve group, utilizes the time difference of the process, enables the energy accumulator groups to realize the simultaneous or single automatic oil supplement of the high-pressure and low-pressure energy accumulator groups through one electromagnetic valve under the control of a pressure signal under the condition of oil leakage, and can select a leather bag type energy accumulator group or a piston type energy accumulator group according to different systems.
4) When the control loop of the lifting cylinder ascends in an energy-saving working state, a main pump of the hydraulic power device sucks pressure oil from an energy accumulator group, and supplies oil to the control loop at full flow (required by a rodless cavity); the main pump sucks pressure oil, which is equivalent to adding a hydraulic thrust to the main pump, and the main pump can also play a role of thrust even if the pressure is low, so that the working power of the motor is reduced, a potential energy conversion device and an oil supplement power device are omitted compared with a conventional energy-saving working mode, the occupied area of the device is smaller, the required capital investment is less, the energy consumption of the device in the conversion process is reduced, and the potential energy recovery rate is relatively improved;
5) the lifting process of the lifting cylinder is in an energy-saving or energy-consumption working state, and the full flow passes through the proportional speed regulating valve (the difference is that the main pump directly absorbs oil from the oil tank in the energy consumption state), so the main control programs in the two states are simple and consistent, and the control mode switching can be realized by one-key operation of an external controller in a seamless transition way; when other loops work, a main pump of the hydraulic power device directly absorbs oil from an oil tank and can work under another set constant-pressure variable pressure, and therefore the whole system is integrated with the energy-saving concept.
Drawings
Fig. 1 is a structural schematic diagram of a potential energy conversion and energy storage type energy-saving hydraulic control system in the prior art.
FIG. 2 is a schematic diagram of the structure of the negative load direct energy storage type hydraulic control system of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting. Furthermore, the terms "first," "second," and the like are used in a tabular sense for descriptive purposes only and are not to be construed as indicating or implying relative importance or imply a number of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; 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.
The direct energy storage type hydraulic control system of the negative load as shown in fig. 2 structurally comprises an energy storage device, a lifting cylinder control valve group, a translation cylinder control valve group and a hydraulic power device, wherein the energy storage device is connected with the lifting cylinder control valve group through a ball valve 1, and the lifting cylinder control valve group is connected with the translation cylinder control valve group in parallel and is simultaneously connected with the hydraulic power device.
The energy storage device comprises a high-pressure energy accumulator group, a low-pressure energy accumulator group and an energy supplementing pressure limiting valve group, wherein the high-pressure energy accumulator group and the low-pressure energy accumulator group are respectively connected with the hydraulic power device through a ball valve 2 and a ball valve 3, and the energy supplementing pressure limiting valve group is simultaneously connected with the high-pressure energy accumulator group and the low-pressure energy accumulator group.
The high pressure accumulator bank includes a high pressure accumulator, a pressure sensor PX1, a reversing valve YX1, and YX 2; wherein, the reversing valves YX1 and YX2 are respectively arranged at two sides of the high-pressure accumulator, and the pressure sensor PX1 is arranged between the high-pressure accumulator and the reversing valve YX 2.
The low pressure accumulator bank includes a low pressure accumulator, a pressure sensor PX2, a directional valve YX3, and YX 4; the directional valves YX3 and YX4 are respectively provided on both sides of the low pressure accumulator, and the pressure sensor PX2 is provided between the low pressure accumulator and the directional valve YX 4.
The energy supplementing pressure limiting valve group is simultaneously connected with the high-pressure accumulator group and the low-pressure accumulator group, is connected with the hydraulic power device through the reversing valve YX5, and realizes graded potential energy recovery according to the load change rule through the energy supplementing pressure limiting valve group.
The lifting cylinder control valve group is connected with a lifting cylinder and specifically comprises a two-way proportional speed regulating valve group YBS, a reversing valve YS3 and a three-position four-way electromagnetic reversing valve YS 1; one end interface of the lifting oil cylinder is connected with a two-way proportional speed regulating valve set YBS, the two-way proportional speed regulating valve set YBS is connected with one end of a three-position four-way electromagnetic reversing valve YS1 through a reversing valve YS3, and the other end of the three-position four-way electromagnetic reversing valve YS1 is connected with the other end interface of the lifting oil cylinder.
The translation cylinder control valve group is connected with a translation cylinder and specifically comprises a two-way proportional speed regulating valve group YBP, a bridge two-way bottom plate and a three-position four-way electromagnetic directional valve YP 1; one end interface of the translation oil cylinder is connected with a two-way proportional speed regulating valve set YBP, the two-way proportional speed regulating valve set YBP is connected with a three-position four-way electromagnetic reversing valve YP1 through a bridge type two-way bottom plate, and the bridge type two-way bottom plate is simultaneously connected with the other end interface of the translation oil cylinder. YP1, YBP constitute the switching-over proportion speed governing valves with the correlation valve, realize the proportion speed governing control to the translation cylinder.
The hydraulic power device comprises a pressure sensor PB, an electric proportional variable pump, an oil tank, a reversing valve YB1 and a reversing valve YB 2; the multi-group parallel electric proportional variable pumps are respectively connected with an oil tank, a pressure sensor PB is connected with the oil tank through a reversing valve YB1, the oil tank is simultaneously connected with a high-pressure energy accumulator group and a low-pressure energy accumulator group through a reversing valve YB2, and is simultaneously connected with a three-position four-way electromagnetic reversing valve YS1 in the lifting cylinder control valve group and a three-position four-way electromagnetic reversing valve YP1 in the translation cylinder control valve group. The YB1 is an electromagnetic unloading valve, the overflow pressure of the electromagnetic unloading valve is adaptive to the system pressure, and the system is protected; the unloading function is only applied when the pump set is started and stopped, the pump set is in an electrified state, namely an unloading state when the pump set is started and stopped, and the purpose is to reduce starting current and reduce stopping impact vibration when the pump set is started and stopped under no load and to be in a power-off state under normal working conditions. YB2 is the fuel outlet valve, the auxiliary function of main system promptly, only obtains the electricity oil drain under the maintenance condition, is in the power failure promptly closed state all the time under normal operating condition.
The basic principle of potential energy recovery and release of the negative load direct energy storage type hydraulic control system provided by the invention is as follows: when the control loop of the lifting cylinder works in an energy-saving working state, a main pump of the hydraulic power device sucks pressure oil from an energy accumulator group and supplies the oil to the control loop at full flow; when the lifting cylinder control loop works in an energy consumption working state, a main pump of the hydraulic power device directly absorbs oil from an oil tank; no matter in the energy-saving or energy-consuming working state, the full flow passes through the speed regulating valve. When other loops work, a main pump of the hydraulic power device directly absorbs oil from an oil tank and can work under another set constant-pressure variable pressure. In actual operation, the specific operation process of the system is as follows (the specific operation process is controlled by a control panel connecting each valve and each sensor in the system, and can be realized by adopting a control panel commonly used in the market):
1) before the first rise, the hydraulic power device sucks oil from the oil tank, and the oil is charged to the high-pressure accumulator group and the low-pressure accumulator group through the electricity obtained by the reversing valve YX 5; when the pressure of the accumulator group reaches the set values of the pressure sensors PX1 and PX2, the reversing valve YX5 is de-energized to complete the liquid charging process;
2) after receiving the ascending signal, the reversing valves YS1, YS3, YX3 and the bidirectional proportional speed regulating valve bank YBS are powered on simultaneously, the hydraulic power device sucks pressure oil from the low-pressure energy accumulator bank, the rodless cavity of the lifting oil cylinder is supplied with the oil through the reversing valves YS1, YS3 and the bidirectional proportional speed regulating valve bank YBS, and the oil in the cavity with the rod returns to the oil tank through the reversing valve YS1, so that the process of low-pressure energy storage release and light-load half-stroke extension (ascending) is completed;
after receiving the position signal, the reversing valve YX3 is de-energized, the reversing valve YX1 is energized, the hydraulic power device sucks pressure oil from the high-pressure energy accumulator group, the oil is continuously supplied to the rodless cavity of the lifting oil cylinder through the reversing valves YS1 and YS3 and the bidirectional proportional speed regulating valve YBS, and the oil with the rod cavity returns to the oil tank through the reversing valve YS1, so that the processes of high-pressure energy storage release and heavy-load half-stroke extension (lifting) are completed, all the related energized elements are de-energized, and at the moment, all the lifting and energy storage device energy release processes are completed;
3) after the discharging of the translation cylinder is finished, the descending process is started: after receiving a descending signal, the reversing valves YS1, YX2 and the bidirectional proportional speed regulating valve bank YBS are simultaneously powered on, the hydraulic power device sucks oil from the oil tank, oil is supplied to a rodless cavity of the lifting cylinder (no-pressure oil supplement) through the reversing valve YS1, and oil in a rod cavity simultaneously enters a high-pressure energy accumulator group through the bidirectional proportional speed regulating valve bank YBS and the reversing valve YX2, so that heavy-load half-stroke retraction (descending) and high-pressure energy accumulation processes are completed;
after receiving the position command signal, the reversing valve YX2 loses power, the reversing valve YX4 gets power, the hydraulic power device sucks oil from the oil tank, oil is continuously supplied to the rodless cavity of the lifting cylinder through the reversing valve YS1 (no-pressure oil supplement), oil in the cavity with the rod enters the low-pressure accumulator group through the YBS and the YX4 simultaneously, so that the light-load half-stroke retraction (descending) and low-pressure energy storage processes are completed, all the related power-on elements lose power, all the descending and energy storage processes are completed at the moment, and energy required by the processes is used in the ascending process of the next cycle.
The energy-saving effect estimation process and the comparison of the negative load direct energy storage type hydraulic control system provided by the invention and the existing potential energy conversion and energy storage type energy-saving hydraulic control system are as follows:
the existing potential energy conversion and energy storage type energy-saving hydraulic control system is adopted, a certain company stepping heating furnace is taken as an example, the pressure generated by a heavy load and a light load on a rodless cavity of a lifting cylinder is 11MPa (A) and 4MPa (B); the hydraulic power device is required to provide 2-3 MPa pressure for the rod cavity in the descending process, which is determined by the working characteristics of the balance valve, the pressure is converted into negative load, and the pressure is equivalent to that the rodless cavity is increased by at least 1.5MPa (C) (the area ratio of a piston rod and a piston of the lifting cylinder is k = 0.5); the pressure loss of all pipeline valves is about 1MPa (D); the pressure loss of the potential energy conversion device is about 1MPa (E); the average pressure loss (actually the change) of the drop in the balance valve is about 1.5MPa (F).
The accumulator pressure P1 of the accumulator and the pressure P2 of the rodless cavity pipeline released to the lifting cylinder during heavy load are calculated as follows: p1= a-C-D-E-F = (11+1.5-1-1-1.5) =9 MPa; p2= P1-D-E =9-1-1=7 MPa; the accumulator pressure P1 and the release to the lift cylinder rodless chamber inlet pressure P2 during light load are calculated: p1= B + C-D-E-F =4+ 1.5-1.5 =3 MPa; p2= P1-D-E =3-1-1=1 MPa; energy saving efficiency = (7+1)/(11+4+2 × 1.5) = 44.4%.
By adopting the negative load direct energy storage type hydraulic control system provided by the invention, taking a certain company stepping heating furnace as an example, the pressure generated by the heavy load and the light negative load on the rodless cavity of the lifting cylinder is 12MPa (A) and 4MPa (B); in the descending process, only the hydraulic power device needs to supplement oil to the rod cavity, and almost zero pressure is achieved; the pressure loss of all pipeline valves is about 1MPa (D); the average pressure loss (actually, the change value) of the descending two-way proportional speed regulating valve is about 1.5MPa (F), and the pressure loss of the ascending two-way proportional speed regulating valve is 1MPa (G).
The charging pressure P1 of the accumulator during heavy load and the pressure P2 released to the closed pump inlet are calculated: p1= a-D-F =11-1-1.5=8.5 MPa; p2= P1-D =8.5-1=7.5 MPa. The accumulator pressure P1 and the release to the lift cylinder rodless chamber inlet pressure P2 during light load are calculated: p1= B-D-F =4-1-1.5=2.5 MPa; p2= P1-D =2.5-1=1.5 MPa; the energy-saving efficiency is = (7.5+1.5)/(11+4) =60%, and is higher than that of the existing potential energy conversion and energy storage type energy-saving hydraulic control system.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A direct energy storage type hydraulic control system of load structurally comprises an energy storage device, a lifting cylinder control valve group, a translation cylinder control valve group and a hydraulic power device, wherein the energy storage device is connected with the lifting cylinder control valve group through a ball valve; the method is characterized in that: the energy storage device comprises a high-pressure energy accumulator group, a low-pressure energy accumulator group and an energy supplementing pressure limiting valve group, wherein the high-pressure energy accumulator group and the low-pressure energy accumulator group are respectively connected with the hydraulic power device through ball valves, and the energy supplementing pressure limiting valve group is simultaneously connected with the high-pressure energy accumulator group and the low-pressure energy accumulator group;
the high pressure accumulator bank includes a high pressure accumulator, a pressure sensor PX1, a reversing valve YX1, and YX 2; the switching-over valves YX1 and YX2 are respectively arranged at two sides of the high-pressure accumulator, and the pressure sensor PX1 is arranged between the high-pressure accumulator and the switching-over valve YX 2;
the low pressure accumulator bank includes a low pressure accumulator, a pressure sensor PX2, a directional valve YX3, and YX 4; the reversing valves YX3 and YX4 are respectively arranged at two sides of the low-pressure accumulator, and the pressure sensor PX2 is arranged between the low-pressure accumulator and the reversing valve YX 4;
the lifting cylinder control valve group is connected with a lifting cylinder and specifically comprises a two-way proportional speed regulating valve group YBS, a reversing valve YS3 and a three-position four-way electromagnetic reversing valve YS 1; one end interface of the lifting oil cylinder is connected with a two-way proportional speed regulating valve set YBS, the two-way proportional speed regulating valve set YBS is connected with one end of a three-position four-way electromagnetic reversing valve YS1 through a reversing valve YS3, and the other end of the three-position four-way electromagnetic reversing valve YS1 is connected with the other end interface of the lifting oil cylinder;
the specific working process of the system is as follows:
1) before the first rise, the hydraulic power device sucks oil from the oil tank, and the oil is charged to the high-pressure accumulator group and the low-pressure accumulator group through the electricity obtained by the reversing valve YX 5; when the pressure of the accumulator group reaches the set values of the pressure sensors PX1 and PX2, the reversing valve YX5 is de-energized to complete the liquid charging process;
2) after receiving the ascending signal, the reversing valves YS1, YS3, YX3 and the bidirectional proportional speed regulating valve bank YBS are powered on simultaneously, the hydraulic power device sucks pressure oil from the low-pressure energy accumulator bank, the rodless cavity of the lifting oil cylinder is supplied with the oil through the reversing valves YS1 and YS3 and the bidirectional proportional speed regulating valve bank YBS, and the oil in the cavity with the rod returns to the oil tank through the reversing valve YS1, so that the processes of low-pressure energy storage release and light-load half-stroke extension are completed; after receiving the position signal, the reversing valve YX3 is de-energized, the reversing valve YX1 is energized, the hydraulic power device sucks pressure oil from the high-pressure energy accumulator group, the oil is continuously supplied to the rodless cavity of the lifting oil cylinder through the reversing valves YS1 and YS3 and the bidirectional proportional speed regulating valve YBS, and the oil with the rod cavity returns to the oil tank through the reversing valve YS1, so that the processes of high-pressure energy storage release and heavy-load half-stroke extension are completed, all the related energized elements are de-energized, and at the moment, all the processes of rising and energy storage device energy release are completed;
3) after the discharging of the translation cylinder is finished, the descending process is started: after receiving the descending signal, the reversing valves YS1, YX2 and the bidirectional proportional speed regulating valve bank YBS are simultaneously powered on, the hydraulic power device sucks oil from the oil tank, the oil is supplied to the rodless cavity of the lifting cylinder through the reversing valve YS1, and the oil in the rod cavity simultaneously enters the high-pressure accumulator bank through the bidirectional proportional speed regulating valve bank YBS and the reversing valve YX2, so that the heavy load half-stroke retraction and high-pressure energy storage processes are completed; after receiving the position command signal, the reversing valve YX2 is de-energized, the reversing valve YX4 is energized, the hydraulic power device sucks oil from the oil tank, oil is continuously supplied to the rodless cavity of the lifting cylinder through the reversing valve YS1, oil in the cavity with the rod enters the low-pressure accumulator group through the YBS and the YX4 simultaneously, so that the light-load half-stroke retraction and low-pressure energy storage processes are completed, all the related energized elements are de-energized, all the descending and energy storage processes are completed at the moment, and the energy required by the processes is used in the ascending process of the next cycle.
2. A hydraulic control system of the negative load direct energy storage type according to claim 1, wherein: the energy supplementing pressure limiting valve group is simultaneously connected with the high-pressure accumulator group and the low-pressure accumulator group and is connected with the hydraulic power device through the reversing valve YX5, so that the potential energy can be recovered in a grading manner according to the load change rule.
3. A hydraulic control system of the negative load direct energy storage type according to claim 1, wherein: the translation cylinder control valve group is connected with a translation cylinder and specifically comprises a two-way proportional speed regulating valve group YBP, a bridge two-way bottom plate and a three-position four-way electromagnetic directional valve YP 1; one end interface of the translation oil cylinder is connected with a two-way proportional speed regulating valve set YBP, the two-way proportional speed regulating valve set YBP is connected with a three-position four-way electromagnetic reversing valve YP1 through a bridge type two-way bottom plate, and the bridge type two-way bottom plate is simultaneously connected with the other end interface of the translation oil cylinder.
4. A hydraulic control system of the negative load direct energy storage type according to claim 1, wherein: the hydraulic power device comprises a pressure sensor PB, an electric proportional variable pump, an oil tank, a reversing valve YB1 and a reversing valve YB 2; the multi-group parallel electric proportional variable pumps are respectively connected with an oil tank, a pressure sensor PB is connected with the oil tank through a reversing valve YB1, the oil tank is simultaneously connected with a high-pressure energy accumulator group and a low-pressure energy accumulator group through a reversing valve YB2, and is simultaneously connected with a three-position four-way electromagnetic reversing valve YS1 in the lifting cylinder control valve group and a three-position four-way electromagnetic reversing valve YP1 in the translation cylinder control valve group.
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| CN102322452A (en) * | 2011-09-13 | 2012-01-18 | 何学才 | Hydraulic balanced energy-saving device for stepped heating furnace |
| CN204140527U (en) * | 2014-09-12 | 2015-02-04 | 鞍钢集团工程技术有限公司 | A kind of hydraulic system of walking-beam furnace |
| CN105114372B (en) * | 2015-09-06 | 2017-07-04 | 山东钢铁集团日照有限公司 | A kind of Hydraulic Pressure System of Reheating Furnace power-economizing method and device |
| CN208595103U (en) * | 2018-08-02 | 2019-03-12 | 上海贺力液压机电有限公司 | Heating furnace intelligent energy-saving hydraulic system |
| CN109488661A (en) * | 2018-12-07 | 2019-03-19 | 浙江鼎诚炉业科技有限公司 | A kind of step heating-furnace hydraulic control system and method |
| CN110005664B (en) * | 2019-04-18 | 2024-06-11 | 江苏南方润滑股份有限公司 | Bidirectional speed regulation hydraulic control system based on negative load oil return cavity of hydraulic cylinder |
| CN211820134U (en) * | 2020-02-27 | 2020-10-30 | 广州白云液压机械厂有限公司 | Heating furnace lifting loop energy-saving hydraulic system capable of meeting various working conditions |
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