CN112128173B - Hydraulic drive energy-saving system of plate and strip stepping heating furnace - Google Patents
Hydraulic drive energy-saving system of plate and strip stepping heating furnace Download PDFInfo
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- CN112128173B CN112128173B CN201910554275.2A CN201910554275A CN112128173B CN 112128173 B CN112128173 B CN 112128173B CN 201910554275 A CN201910554275 A CN 201910554275A CN 112128173 B CN112128173 B CN 112128173B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 19
- 230000001502 supplementing effect Effects 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 claims description 121
- 239000010720 hydraulic oil Substances 0.000 claims description 21
- 238000004146 energy storage Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000010985 leather Substances 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 206010063385 Intellectualisation Diseases 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- 230000005484 gravity Effects 0.000 description 5
- 238000005381 potential energy Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- RZTAMFZIAATZDJ-UHFFFAOYSA-N felodipine Chemical compound CCOC(=O)C1=C(C)NC(C)=C(C(=O)OC)C1C1=CC=CC(Cl)=C1Cl RZTAMFZIAATZDJ-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Classifications
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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
- F15B21/087—Control strategy, e.g. with block diagram
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
- F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic drive energy-saving system of a plate and strip stepping heating furnace, which comprises a stepping mechanical lifting hydraulic cylinder system, a furnace door lowering hydraulic cylinder system, a hydraulic pump station, an oil supplementing pump station and an electric control system; the stepping mechanical lifting hydraulic cylinder system comprises a stepping mechanical hydraulic cylinder, a first high-pressure energy accumulator group, a middle-pressure energy accumulator group, a low-pressure energy accumulator group, a first control valve group, a second control valve group and a first valve group, and the furnace door lifting hydraulic cylinder system comprises a furnace door hydraulic cylinder, a second high-pressure energy accumulator group, a third control valve group, a fourth control valve group and a second valve group. The invention adopts the stepping mechanical hydraulic cylinder, the furnace door hydraulic cylinder, the leather bag type energy accumulator group and the electric control system to automatically adjust according to the power required by the equipment, has small peak flow of the system and low installed power, adapts to the flow change and the power requirement, and realizes the optimization of the energy requirement of the system, thereby realizing the energy consumption required by the operation of the stepping machinery and the furnace door of the plate and strip heating furnace to the maximum extent, and has the characteristics of intellectualization, self-adaption and automatic power matching.
Description
Technical Field
The invention relates to the technical field of hydraulic drive energy-saving systems of plate and strip stepping heating furnaces, in particular to a hydraulic drive energy-saving system of a plate and strip stepping heating furnace.
Background
Recently, the heating furnaces for hot rolling of inner plate strips are mostly stepping heating furnaces, and along with the gradual shortage of plant planning land, the furnace body size is gradually increased, and the load is continuously increased, so that the large-scale and intensive industrial production requirements are realized, and the stepping machinery and furnace doors of main equipment are driven by hydraulic cylinders, so that the requirements of planar arrangement and high driving power of a process plane are met.
The stepping machine of the stepping heating furnace operates and the furnace door is opened in an intermittent working mode, the stepping machine conveys billets from a loading end to a discharging end, the furnace door is opened and closed according to steel loading and tapping instructions of the heating furnace, so that the stepping machine and the furnace door operate in a period of continuous change in operation and stop, the stepping machine has the basic function of lifting and lowering billets in the furnace, the furnace door ascends and descends to realize opening and closing, the furnace door is driven and controlled by a hydraulic cylinder to finish the opening and closing, the load to be overcome is mainly the dead weight of the stepping machine and the weight of the billets, and the load to be overcome in the opening and closing of the furnace door is almost the dead weight of the furnace door.
From the above description, it can be seen that the stepping machine and the oven door work intermittently, mainly overcoming the gravity of the load and the gravity of the oven door, and are periodic. The number of main pumps and the power of a motor of the traditional hydraulic station are required to be configured according to the maximum speed and the maximum load requirement of the movement of the stepping machine, so that the hydraulic station is high in installed power and high in starting power, the motor drives the hydraulic main pump to operate uninterruptedly and to operate in standby mode, the configuration can only realize the simple action requirement of the stepping machine and a furnace door, cannot adapt to the matching requirement of the load in the lifting working process of the stepping machine and the furnace door on the input power, and cannot track the load change of the stepping machine to adjust the starting power, so that the equipment is high in energy consumption, high in heating value, high in maintenance and operation cost and high in enterprise production cost. In order to solve the problems of high energy consumption and uneconomical operation of the prior stepping machine and furnace door of the plate and strip heating furnace, the hydraulic driving energy-saving system of the plate and strip heating furnace is designed to be a very practical and significant work.
Disclosure of Invention
1. Technical problem to be solved
The invention aims to provide a hydraulic drive energy-saving system of a plate and strip stepping heating furnace, which aims to solve the problems in the background technology.
2. Technical proposal
In order to solve the problems, the invention adopts the following technical scheme:
A hydraulic drive energy-saving system of a plate and strip stepping heating furnace comprises a stepping mechanical lifting hydraulic cylinder system, a furnace door lifting hydraulic cylinder system, a hydraulic pump station, an oil supplementing pump station and an electric control system.
The stepping mechanical lifting hydraulic cylinder system comprises a stepping mechanical hydraulic cylinder, a first high-pressure energy accumulator group, a middle-pressure energy accumulator group, a low-pressure energy accumulator group, a first control valve group, a second control valve group and a first energy accumulator valve group, wherein an oil port A and an oil port C of the stepping mechanical hydraulic cylinder are connected with the first control valve group for controlling the flow and the pressure of hydraulic oil at the oil port A and the oil port C of the stepping mechanical hydraulic cylinder through oil paths, an oil port B of the stepping mechanical hydraulic cylinder is connected with the second control valve group for controlling the flow and the pressure of hydraulic oil at the oil port B of the stepping mechanical hydraulic cylinder through oil paths, the first high-pressure energy accumulator group, the middle-pressure energy accumulator group and the low-pressure energy accumulator group are connected with the second control valve group through oil paths, and the first energy accumulator valve groups for controlling the flow and the pressure of hydraulic oil at the high-pressure energy accumulator group, the middle-pressure energy accumulator group and the low-pressure energy accumulator group are arranged on oil paths among the first high-pressure energy accumulator group, the middle-pressure energy accumulator group and the second control valve group;
The furnace door lifting hydraulic cylinder system comprises a furnace door hydraulic cylinder, a high-pressure energy accumulator group II, a control valve group III, a control valve group IV and an energy accumulator valve group I, wherein an oil port A of the furnace door hydraulic cylinder is connected with the atmosphere, the oil port B of the furnace door hydraulic cylinder is connected with the control valve group III for controlling the flow and the pressure of hydraulic oil at the oil port B of the furnace door hydraulic cylinder through an oil way, the high-pressure energy accumulator group II is connected with the control valve group III through an oil way, a valve group II for controlling the flow and the pressure of hydraulic oil at the high-pressure energy accumulator group II is arranged on an oil way between the high-pressure energy accumulator group II and the control valve group III, and the oil port C of the furnace door hydraulic cylinder is connected with the control valve group IV for controlling the flow and the pressure of hydraulic oil at the oil port C of the furnace door hydraulic cylinder through an oil way;
The hydraulic pump station is connected with the first control valve group and the fourth control valve group through oil ways respectively, and the oil supplementing pump station is connected with the second control valve group and the third control valve group through oil ways respectively.
The electric control system comprises a controller, a detection element and a control valve group, and is used for automatically controlling the working of the energy accumulator group and the working of the hydraulic pump station, and automatically matching the opening of the high-pressure energy accumulator group I, the medium-pressure energy accumulator group, the low-pressure energy accumulator group and the hydraulic pump station, or opening the low-pressure energy accumulator group, the medium-pressure energy accumulator group and the high-pressure energy accumulator group one by one, or opening part or all; and the running speed of the load of the hydraulic cylinder of the furnace door is automatically tracked and identified, and the second high-pressure energy accumulator set and the hydraulic pump station are indicated to work cooperatively, and the hydraulic pump station is started.
Preferably, the detecting element comprises a pressure sensor arranged at the output end of the stepping mechanical hydraulic cylinder, a displacement sensor arranged at the output end of the furnace door hydraulic cylinder and a pressure relay arranged on an oil return pipeline of the furnace door hydraulic cylinder, wherein the displacement sensor and the pressure relay are used for identifying the running speed of the load of the furnace door hydraulic cylinder, the inside of the control valve group is respectively provided with an electromagnetic reversing valve A used for controlling the cooperation of a high-pressure energy accumulator group II and a hydraulic pump station, and the opening of the hydraulic pump station and an electromagnetic reversing valve A used for controlling the opening of the high-pressure energy accumulator group I, the medium-pressure energy accumulator group, the low-pressure energy accumulator group and the hydraulic pump station are respectively opened, or the low-pressure energy accumulator group, the medium-pressure energy accumulator group and the high-pressure energy accumulator group are opened one by one, or the opening part is opened, or all the electromagnetic reversing valves B are opened.
Preferably, the first controller valve group, the second control valve group, the third control valve group, the fourth control valve group, the first energy accumulator valve group, the second energy accumulator valve group, the oil filling pump station and the hydraulic oil station are all controlled to be opened and closed by a controller in the electric control system.
Preferably, the stepping mechanical hydraulic cylinder and the furnace door hydraulic cylinder all comprise a cylinder body, a guide column, a sliding cylinder and an annular piston, a hydraulic cavity is formed in the cylinder body, the guide column is arranged at the central position of the hydraulic cavity, an oil inlet channel is formed in the guide column in a penetrating mode in the length direction, the sliding cylinder is arranged on the outer side of the guide column in a sliding mode, the annular piston is arranged on the outer side of the bottom end of the sliding cylinder in the hydraulic cavity, an oil port B is formed in the side wall of the cylinder body on one side of the annular piston, an oil port A is formed in the side wall of the cylinder body on the other side of the annular piston, and an oil port C is formed in one end of the cylinder body on one end of the oil inlet channel.
Preferably, two guide wheels are arranged above the furnace door in parallel, a steel wire rope is arranged at the top of the furnace door, and one end, far away from the furnace door, of the steel wire rope extends through the two guide wheels to be connected with the output end of the hydraulic cylinder of the furnace door.
Preferably, the energy accumulator group is a bellows type energy accumulator group.
3. Advantageous effects
The invention adopts the stepping mechanical hydraulic cylinder, the furnace door hydraulic cylinder, the leather bag type energy accumulator group and the electric control system to automatically track the power required by the equipment in the process, automatically adjusts the power, has small peak flow of the system, low installed power, self-adaptive flow change and power requirement, and realizes the optimization of the energy requirement of the system, thereby maximally realizing the energy consumption required by the stepping machinery of the plate and belt heating furnace and the operation of the furnace door, and the power is automatically matched, the power transmitted by the outside is the least, namely the power consumption is greatly reduced, even only 1/3 or even 1/4 of the original installed power; the device has the characteristics of compact structure, convenient manufacture and installation, easy maintenance, overhaul and the like; the consumption of consumable materials such as spare parts, filter elements and hydraulic oil serving as working media is low; the heat productivity of the equipment is low, even no heat is generated; the vibration impact of the pipeline is small, and even the vibration of the pipeline is eliminated; daily spot inspection and maintenance work are reduced; the equipment runs stably and has low noise; low manufacturing cost and good economical efficiency.
Drawings
FIG. 1 is a diagram of an overall control system of the present invention;
FIG. 2 is a schematic diagram of a stepper mechanical lift cylinder system of the present invention;
FIG. 3 is a schematic diagram of the hydraulic cylinder system for lifting the furnace door of the present invention;
Fig. 4 is a schematic diagram of the structure of the hydraulic cylinder of the furnace door and the hydraulic cylinder of the stepping machine.
Reference numerals: the hydraulic cylinder comprises a first control valve group, a 2-stepping mechanical hydraulic cylinder, a second 3-control valve group, a first 4-energy accumulator valve group, a 5-low-pressure energy accumulator group, a 6-medium-pressure energy accumulator group, a first 7-high-pressure energy accumulator group, an 8-furnace door, a fourth 9-control valve group, a 10-guide wheel, a second 11-high-pressure energy accumulator group, a second 12-energy accumulator valve group, a third 13-control valve group, a 14-furnace door hydraulic cylinder, a 15-oil port B, a 16-annular piston, a 17-oil inlet channel, a 18-sliding cylinder, a 19-oil port A, a 20-hydraulic cavity, a 21-cylinder body, a 22-guide column and a 23-oil port C.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples.
Examples
The pressure sensor used in this example is of the type; skf-23797, the model of the displacement sensor is: MTS: RHM1130MP05S1G310, pressure relay number HYDAC: EDS8446-2-0400-000, and the electromagnetic directional valves of the electromagnetic directional valve A and the electromagnetic directional valve B are respectively of Ward type: the model of the 4WE10J31B/CG24N9Z5L and the model of the controller are; siemens PLC;
The hydraulic drive energy-saving system of the plate and strip stepping heating furnace shown in fig. 1 comprises a stepping mechanical lifting hydraulic cylinder system, a furnace door lifting hydraulic cylinder system, a hydraulic pump station, an oil supplementing pump station and an electric control system.
The stepping mechanical lifting hydraulic cylinder system comprises a stepping mechanical hydraulic cylinder 2, a first high-pressure energy accumulator group 7, a middle-pressure energy accumulator group 6, a low-pressure energy accumulator group 5, a first control valve group 1, a second control valve group 3 and a first energy accumulator group 4, wherein an oil port A19 and an oil port C21 of the stepping mechanical hydraulic cylinder 2 are connected with a first control valve group 1 for controlling the flow and the pressure of hydraulic oil at the position of the oil port A19 and the position of the oil port C21 of the stepping mechanical hydraulic cylinder 2 through oil paths, an oil port B15 of the stepping mechanical hydraulic cylinder 2 is connected with a second control valve group 3 for controlling the flow and the pressure of hydraulic oil at the position of the oil port B15 of the stepping mechanical hydraulic cylinder 2 through oil paths, the first high-pressure energy accumulator group 7, the middle-pressure energy accumulator group 6 and the low-pressure energy accumulator group 5 are connected with the second control valve group 3 through oil paths, and the oil paths among the first high-pressure energy accumulator group 7, the middle-pressure energy accumulator group 6, the low-pressure energy accumulator group 5 and the second control valve group 3 are all provided with an energy accumulator group 4 for controlling the flow and the pressure of hydraulic oil at the position of the oil ports between the first high-pressure energy accumulator group 7, the middle-pressure energy accumulator group 6 and the low-pressure energy accumulator group 5 and the second control valve group 3, and the energy accumulator group is a leather bag type;
The furnace door lifting hydraulic cylinder system comprises a furnace door hydraulic cylinder 14, a high-pressure energy accumulator group II 11, a control valve group III 13, a control valve group IV 9 and an energy accumulator group I12, an oil port A19 of the furnace door hydraulic cylinder 14 is connected with the atmosphere, an oil port B15 of the furnace door hydraulic cylinder 14 is connected with the control valve group III 13 used for controlling the flow and the pressure of hydraulic oil at the oil port B15 of the furnace door hydraulic cylinder 14 through an oil way, the high-pressure energy accumulator group II 11 is connected with the control valve group III 13 through an oil way, a valve group II 12 used for controlling the flow and the pressure of hydraulic oil of the high-pressure energy accumulator group II 11 is arranged on the oil way between the high-pressure energy accumulator group II 11 and the control valve group III 13, an oil port C21 of the furnace door hydraulic cylinder 14 is connected with the control valve group IV 9 used for controlling the flow and the pressure of hydraulic oil at the oil port C21 of the furnace door hydraulic cylinder 14 through an oil way, two guide wheels 10 are arranged above the furnace door 8 in parallel, the top of the furnace door 8 is provided with a steel wire rope, one end, far away from the furnace door 8, of the steel wire rope extends through two guide wheels 10 to be connected with the output end of a furnace door hydraulic cylinder, each of the stepping mechanical hydraulic cylinder 2 and the furnace door hydraulic cylinder 14 comprises a cylinder body 21, a guide post 22, a sliding cylinder 18 and an annular piston 16, a hydraulic cavity 20 is arranged in the cylinder body 21, a guide post 22 is arranged at the central position in the hydraulic cavity 20, an oil inlet channel 17 penetrates through the guide post 22 in the length direction, a sliding cylinder 18 is arranged on the outer side of the guide post 22, the annular piston 16 is arranged on the outer side of the bottom end of the sliding cylinder 18 in the hydraulic cavity 20, an oil port B15 is arranged on the side wall of the cylinder body 21 on one side of the annular piston 16, an oil port A19 is arranged on the side wall of the cylinder body 21 on the other side of the annular piston 16, and an oil port C23 is arranged on one end of the cylinder body 21 on one end of the oil inlet channel 17;
The hydraulic pump station is respectively connected with the first control valve group 1 and the fourth control valve group 9 through oil ways, the oil supplementing pump station is respectively connected with the second control valve group 3 and the third control valve group 13 through oil ways, and the first controller valve group 1, the second control valve group 3, the third control valve group 13, the fourth control valve group 9, the first accumulator valve group 4, the second accumulator valve group 12, the oil supplementing pump station and the hydraulic oil station are electrically connected with the electric control system.
The electric control system comprises a controller, a detection element and a control valve group, wherein the detection element comprises a pressure sensor arranged at the output end of a stepping mechanical hydraulic cylinder 2, a displacement sensor arranged at the output end of a furnace door hydraulic cylinder 14 and a pressure relay arranged on an oil return pipeline of the furnace door hydraulic cylinder 14, the pressure relay is an element which enables an electric contact to act when the fluid pressure reaches a preset value in the hydraulic system, the pressure relay can also be defined as a hydraulic element which converts the pressure into an electric signal, a customer can realize the function of outputting an electric signal when a certain set pressure is achieved by adjusting the pressure relay according to the pressure design requirement, the displacement sensor and the pressure relay are used for identifying the running speed of the load of the furnace door hydraulic cylinder 14, and an electromagnetic reversing valve A for controlling the opening of the high-pressure accumulator group II 11 and a hydraulic pump station and an electromagnetic reversing valve B for controlling the opening of the high-pressure accumulator group I7, the medium-pressure accumulator group 5 and the hydraulic pump station or opening part or all of the electromagnetic reversing valves B are arranged in the control valve group I.
The working principle is as follows; 1. working principle of a stepping mechanical lifting hydraulic cylinder system: the piston rod of the hydraulic cylinder 2 of the stepping machine is ejected out, the stepping machine is lifted together with the load, the gravity of the equipment together with the load and the friction of the system are overcome, the load is dead weight firstly and then the weight of the steel billet in the dead weight charging furnace is added, and the load is the maximum load at the moment; the piston rod of the hydraulic cylinder 2 of the stepping machine retreats, the stepping machine falls together with the load, the friction resistance of the system is overcome, the load is the weight of a steel billet in a dead weight charging furnace at first, the load is the maximum load at the moment, then the dead weight is the load, the load is changed in the process, as oil is fed into an oil port B15 and an oil port C21 of the hydraulic cylinder 2 of the stepping machine in the figure 2, the oil is returned from an oil port A19, and the piston rod can be pushed to be ejected out;
In the process, a pressure sensor of a detection element of an electric control system is used for identifying the load change of a stepping mechanical hydraulic cylinder 2 and transmitting signals to a controller, the controller utilizes an electromagnetic reversing valve B of a control valve group to control the opening of a high-medium-low pressure energy accumulator group and a hydraulic pump station, or opens a first high-pressure energy accumulator group 7, a middle-pressure energy accumulator group 6 and a low-pressure energy accumulator group 5 one by one, or opens a part or opens all of the high-pressure energy accumulator group 7, the middle-pressure energy accumulator group 6 and the low-pressure energy accumulator group 5, when a pressure relay of the electric control system identifies that the flow rate or the pressure provided by the energy accumulator group is insufficient, an oil port C21 is changed from an oil supplementing state to an operating state, pressure and flow rate are started to be established, the controller works in cooperation with the first high-pressure energy accumulator group 7, the middle-pressure energy accumulator group 6 and the low-pressure energy accumulator group 5 to drive a piston rod to push out according to a specified speed curve, the ascending process is completed, an oil port A19 of the stepping mechanical hydraulic cylinder 2 in figure 2, the oil port B15 charges oil for energy storage of the energy storage device, the oil port C21 returns oil, the piston rod of the stepping mechanical lifting cylinder retreats, the equipment and the load descend under the action of gravity in the descending process to complete an action cycle, the gravitational potential energy acts on the energy storage device through the oil port B15, the energy storage device absorbs the gravitational potential energy of the equipment and the load, the load is changed in the process, the pressure sensor of the detection element of the electric control system is used for recognizing the change of the load of the stepping mechanical hydraulic cylinder and transmitting signals to the controller, the controller utilizes the electromagnetic reversing valve of the control valve group B to control the energy storage device to work and the hydraulic pump station to automatically match the opening of the high-pressure energy storage device 7, the medium-pressure energy storage device 6, the low-pressure energy storage device 5 and the hydraulic pump station, and can open the high-pressure energy storage device 7, the medium-pressure energy storage device 6 one by one, the low-pressure energy accumulator group 5 is started or a certain energy accumulator group is started, the electronic control system converts the gravitational potential energy of the equipment into the pressure energy of the energy accumulator group according to the descending curve of the hydraulic cylinder calibrated by the system, the oil port C21 only has the function of returning oil in the descending process, the oil port A19 can be in a pure oil supplementing state or can be in a pressure and flow requirement establishment state under the command of the electronic control system, and the energy storage pressure requirement of each energy accumulator group is met under the condition of ensuring the descending speed curve of the stepping mechanical hydraulic cylinder 2.
The working principle of the furnace door lifting hydraulic cylinder 14 can be seen from the figure 3 that the load driven by the furnace door hydraulic cylinder 14 is the furnace door 8, the oil port B15 is connected with the energy accumulator group II 11, the oil port A19 is communicated with the atmosphere, the oil port C17 is connected with the hydraulic pump station, when the furnace door 8 is opened, the piston rod of the furnace door hydraulic cylinder 14 withdraws to lift the furnace door 8, and the gravity and the system friction force of the furnace door 8 are overcome; the piston rod of the hydraulic furnace door cylinder 14 is ejected, the furnace door 8 falls and closes, the friction resistance of the system is overcome, when the furnace door 8 is opened in fig. 3, the oil ports B15 and C21 of the hydraulic furnace door cylinder 14 are filled with oil and can push the piston rod to retract, the furnace door 8 is lifted, the load is almost constant in the process, a displacement sensor and a pressure relay are used for identifying the running speed of the load of the hydraulic furnace door cylinder 14 and transmitting signals to a controller, the controller utilizes an electromagnetic reversing valve A of a control valve group to instruct an accumulator group II 11 to work cooperatively with a hydraulic pump station, the hydraulic pump station is opened, the oil port C21 establishes pressure and flow, the high-pressure accumulator group II 11 releases pressure potential energy, under the command of the electric control system, the furnace door 8 is lifted at a preset speed, when the furnace door 8 is closed, the piston rod of the hydraulic furnace door cylinder 14 is ejected, the oil port B15 returns oil, the pressure and the oil port C21 establishes pressure and flow requirements, the furnace door falls and closes, in the process, the action of the high-pressure accumulator group II 11 is converted by the command of the electric control system, and the coordination of the weight potential energy of the furnace door 8 is used for the next action cycle.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments will fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (3)
1. The hydraulic drive energy-saving system of the plate and strip stepping heating furnace is characterized by comprising a stepping mechanical lifting hydraulic cylinder system, a furnace door lifting hydraulic cylinder system, a hydraulic pump station, an oil supplementing pump station and an electric control system;
The stepping mechanical lifting hydraulic cylinder system comprises a stepping mechanical hydraulic cylinder (2), a first high-pressure energy accumulator group (7), a middle-pressure energy accumulator group (6), a low-pressure energy accumulator group (5), a first control valve group (1), a second control valve group (3) and a first energy accumulator group (4), wherein an oil port A (19) and an oil port C (23) of the stepping mechanical hydraulic cylinder (2) are connected with the first control valve group (1) for controlling the flow rate and the pressure of hydraulic oil at the oil port A (19) and the oil port C (23) of the stepping mechanical hydraulic cylinder (2) through oil ways, an oil port B (15) of the stepping mechanical hydraulic cylinder (2) is connected with the second control valve group (3) for controlling the flow rate and the pressure of hydraulic oil at the oil port B (15) of the stepping mechanical hydraulic cylinder (2) through oil ways, the first high-pressure energy accumulator group (7), the middle-pressure energy accumulator group (6) and the low-pressure energy accumulator group (5) are connected with the second control valve group (3) through oil ways, and the first high-pressure energy accumulator group (7), the middle-pressure energy accumulator group (6), the low-pressure energy accumulator group (5) and the first control valve group (4) are arranged between the high-pressure energy accumulator group (5) and the second control valve group (3) through oil ways;
The furnace door lifting hydraulic cylinder system comprises a furnace door hydraulic cylinder (14), a high-pressure energy accumulator group II (11), a control valve group III (13), a control valve group IV (9) and an energy accumulator group II (12), wherein an oil port A (19) of the furnace door hydraulic cylinder (14) is connected with the atmosphere, an oil port B (15) of the furnace door hydraulic cylinder (14) is connected with a control valve group III (13) for controlling the flow and the pressure of hydraulic oil at the oil port B (15) of the furnace door hydraulic cylinder (14) through an oil way, the high-pressure energy accumulator group II (11) is connected with the control valve group III (13) through an oil way, the valve group II (12) for controlling the flow and the pressure of hydraulic oil of the high-pressure energy accumulator group II (11) is arranged on the oil way between the high-pressure energy accumulator group II (11) and the control valve group III (13), and an oil port C (23) of the furnace door hydraulic cylinder (14) is connected with the control valve group IV (9) for controlling the flow and the pressure of hydraulic oil at the oil port C (23) of the furnace door hydraulic cylinder (14) through an oil way;
The hydraulic pump station is respectively connected with the first control valve group (1) and the fourth control valve group (9) through oil ways, and the oil supplementing pump station is respectively connected with the second control valve group (3) and the third control valve group (13) through oil ways;
The electric control system comprises a controller, a detection element and a control valve group, and controls the opening of the first high-pressure energy accumulator group (7), the middle-pressure energy accumulator group (6), the low-pressure energy accumulator group (5) and the hydraulic pump station, or the low-pressure energy accumulator group, the middle-pressure energy accumulator group and the high-pressure energy accumulator group are opened one by one, or the opening part or all of the low-pressure energy accumulator group, the middle-pressure energy accumulator group and the high-pressure energy accumulator group are opened one by one; the running speed of the load of the furnace door hydraulic cylinder (14) is automatically tracked and identified, the high-pressure energy accumulator group II (11) and the hydraulic pump station are indicated to work cooperatively, and the hydraulic pump station is started;
The detection element comprises a pressure sensor arranged at the output end of the stepping mechanical hydraulic cylinder (2), a displacement sensor arranged at the output end of the furnace door hydraulic cylinder (14) and a pressure relay arranged on an oil return pipeline of the furnace door hydraulic cylinder (14), wherein the displacement sensor and the pressure relay are used for identifying the running speed of the load of the furnace door hydraulic cylinder (14), the inside of the control valve group is respectively provided with an electromagnetic reversing valve A used for controlling the cooperation of a high-pressure energy accumulator group II (11) and a hydraulic pump station, and the opening of the hydraulic pump station is used for controlling the opening of the high-pressure energy accumulator group I (7), the medium-pressure energy accumulator group (6), the low-pressure energy accumulator group (5) and the hydraulic pump station, or the opening of the low-pressure energy accumulator group, the medium-pressure energy accumulator group and the high-pressure energy accumulator group one by one, or the opening part or all electromagnetic reversing valves B are opened;
The stepping mechanical hydraulic cylinder (2) and the furnace door hydraulic cylinder (14) comprise a cylinder body (21), a guide column (22), a sliding cylinder (18) and an annular piston (16), a hydraulic cavity (20) is arranged in the cylinder body (21), the guide column (22) is arranged at the central position in the hydraulic cavity (20), an oil inlet channel (17) is penetrated in the length direction in the guide column (22), the sliding cylinder (18) is arranged outside the guide column (22), the annular piston (16) is arranged outside the bottom end of the sliding cylinder (18) in the hydraulic cavity (20), an oil port B (15) is arranged on the side wall of the cylinder body (21) on one side of the annular piston (16), an oil port A (19) is arranged on the side wall of the cylinder body (21) on the other side of the annular piston (16), and an oil port C (23) is arranged at one end of the cylinder body (21) on one end of the oil inlet channel (17).
Two guide wheels (10) are arranged above the furnace door (8) in parallel, a steel wire rope is arranged at the top of the furnace door (8), and one end, far away from the furnace door (8), of the steel wire rope extends through the two guide wheels (10) to be connected with the output end of the hydraulic cylinder of the furnace door.
2. The hydraulic drive energy-saving system of the plate and strip stepping heating furnace according to claim 1, wherein the first control valve group (1), the second control valve group (3), the third control valve group (13), the fourth control valve group (9), the first energy storage valve group (4), the second energy storage valve group (12), the oil supplementing pump station and the hydraulic oil station are all controlled to be opened and closed by a controller in an electric control system.
3. The hydraulic drive energy saving system of a sheet and strip stepper furnace of claim 1 wherein the accumulator pack is a bellows accumulator pack.
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