CN115990618B - Rolling mill roll gap compensation device and method - Google Patents
Rolling mill roll gap compensation device and method Download PDFInfo
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- CN115990618B CN115990618B CN202310289389.5A CN202310289389A CN115990618B CN 115990618 B CN115990618 B CN 115990618B CN 202310289389 A CN202310289389 A CN 202310289389A CN 115990618 B CN115990618 B CN 115990618B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 140
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 230000008713 feedback mechanism Effects 0.000 claims abstract description 21
- 230000009471 action Effects 0.000 claims abstract description 11
- 238000010008 shearing Methods 0.000 claims description 54
- 230000008093 supporting effect Effects 0.000 claims description 47
- 238000005452 bending Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 230000001960 triggered effect Effects 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
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- 230000006978 adaptation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- 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
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Abstract
The invention belongs to the technical field of metal rolling, and particularly relates to a rolling mill roll gap compensation device and a rolling mill roll gap compensation method, wherein the device comprises a detection feedback mechanism and an executing mechanism, the detection feedback mechanism comprises a left detection module, a right detection module and a support seat detection module, the left detection module is arranged on the left side of a stand and positioned between an upper roller and a lower roller, the detection module comprises a first strain gauge, a second strain gauge, a third strain gauge and a fourth strain gauge, the first strain gauge and the second strain gauge are fixed on the front side of the stand, the third strain gauge and the fourth strain gauge are fixed on the rear side of the stand, the first strain gauge, the second strain gauge, the third strain gauge and the fourth strain gauge are sequentially connected in series by a wire according to serial numbers, and finally the first strain gauge is connected in series with the fourth strain gauge by a wire; according to the invention, the strain gauge is adopted as a mechanical parameter acquisition sensor, and the single chip microcomputer is used for controlling the driving motor and the pushing hydraulic cylinder to respectively perform roll gap compensation actions aiming at different rolling conditions, so that the thickness control of the plate is realized.
Description
Technical Field
The invention belongs to the technical field of metal rolling, and particularly relates to a rolling mill roll gap compensation device and method.
Background
With the development of the times, the market competition of steel is vigorous, and the pursuit of high quality and high performance of steel products by various departments not only requires stable steel performance, but also requires high precision. The steel precision mainly refers to the parameter precision of the plate, including the thickness, width, flatness, shape and the like of a coiled plate, and among precision indexes of all plate blank finished products, the plate blank thickness precision is the most important index of the plate and strip production quality. Therefore, the accuracy and precision of roll gap control directly affect the quality and yield of products during the production process of the rolling technology.
The equipment for roll gap control is mainly classified into three types according to the manner of performing compensation, namely manual operation compensation, automatic motor compensation and automatic hydraulic compensation. The manual operation compensation mainly takes naked eye observation as a main control mode of the roll gap in the rolling process by manual intervention, and the method mainly depends on experience of operators in precision and cannot realize large-scale high-precision roll gap control and rolling production. The automatic compensation of the motor mainly realizes the adjustment of the roll gap through the action of the motor, but the control of the method has certain hysteresis, which is unfavorable for the control of the thickness precision of the plate. The hydraulic automatic compensation mainly realizes the adjustment of the roll gap through the action of a hydraulic system, gradually becomes the development trend of a pressure control system, and has the characteristics of high response speed, small action inertia, high control precision, high cut-off frequency, strong anti-interference performance and the like. With the development of modern control technology, the roll gap control system used in China at the present stage mainly comprises: absolute AGC, relative AGC, monitored AGC, etc.
The absolute AGC mainly calculates the measured thickness by using the actual measured signal fed back after rolling the rolled piece, compares the measured thickness with the target value, and further executes roll gap compensation control. However, if the idle roll gap is set improperly, the thickness of the head of the rolled piece is quite different from the set value, so that the load of the pressing system is too large, and the wedge thickness difference of the strip steel is caused. The relative AGC mainly uses the measured thickness of the head of the rolled piece as a target value, and the roll gap compensation control always uses the actual thickness of the head as a standard no matter whether the head of the rolled piece accords with a set value. The monitoring AGC detects the thickness deviation of the strip at the outlet side of the rolling mill through the outlet side thickness gauge, and controls the roll gap or rolling pressure so that the thickness deviation is close to zero. However, the system has complex composition, so that the faults and signals of the system are complex and various, and the operation and maintenance difficulty is high.
Disclosure of Invention
The invention provides a rolling mill roll gap compensation device and a rolling mill roll gap compensation method aiming at the problems.
The invention adopts the following technical scheme to achieve the aim:
the rolling mill roll gap compensation device comprises a detection feedback mechanism and an executing mechanism;
the detection feedback mechanism comprises a left detection module, a right detection module and a support seat detection module, wherein the left detection module is arranged on the left side of the frame and is positioned between an upper roller and a lower roller, the detection feedback mechanism comprises a first strain gauge, a second strain gauge, a third strain gauge and a fourth strain gauge, wherein the first strain gauge and the second strain gauge are fixed on the front side of the frame, the first strain gauge and the second strain gauge are placed in a orthorhombic position, the third strain gauge and the fourth strain gauge are fixed on the rear side of the frame, the third strain gauge is positioned on the rear side of the first strain gauge, the fourth strain gauge is positioned on the rear side of the second strain gauge, the third strain gauge, the fourth strain gauge and the fourth strain gauge are placed in an orthorhombic position, the first strain gauge, the second strain gauge, the third strain gauge and the fourth strain gauge are sequentially connected in series according to a serial number wire, finally the first strain gauge and the fourth strain gauge are connected in series between the first strain gauge and the second strain gauge and the fourth strain gauge, and the fourth strain gauge are led out of a wire between the first strain gauge and the fourth strain gauge and a preset wire and a second strain gauge and a preset wire respectively, and a first strain gauge and a second strain gauge and a third strain gauge are led out between a first strain gauge and a preset wire and a second strain gauge and a preset wire; the right detection module is arranged on the right side of the frame and positioned between the upper roller and the lower roller, and comprises a fifth strain gauge, a sixth strain gauge, a seventh strain gauge and an eighth strain gauge, and the installation mode and the wiring mode of the right detection module are the same as those of the left detection module; the supporting seat detection module comprises a nine-strain gauge, a ten-strain gauge, an eleven-strain gauge and a twelve-strain gauge, wherein the nine-strain gauge and the ten-strain gauge are fixed on the upper surface of the roller supporting seat and are placed in an orthogonal pose, the eleven strain gauge and the twelve strain gauge are fixed on the lower surface of the roller supporting seat, the eleven strain gauge is positioned on the lower side of the nine strain gauge, the twelve strain gauge is positioned on the lower side of the ten strain gauge, the nine strain gauge, the eleven strain gauge and the ten strain gauge and the twelve strain gauge are placed in orthogonal positions, the nine-gauge strain gauge, the eleven-gauge strain gauge strain finally, the nine-gauge strain gauge is connected with the twelve-gauge strain gauge in series by a lead, and finally, the nine-gauge strain gauge and the gauge strain gauge the twelve strain gauges are connected in series by a lead; input voltage preset ports in the left detection module, the right detection module and the supporting seat detection module are all connected in parallel to a constant voltage power supply, the constant voltage power supply supplies power, and output voltage ports in the left detection module, the right detection module and the supporting seat detection module are respectively connected in parallel and then are connected into I/O interfaces of the single chip microcomputer in three ways;
the actuating mechanism is contacted with the roller supporting seat and is used for carrying out corresponding supporting action according to the signal of the detection feedback mechanism so as to realize the compensation of the roller gap.
Further, the actuating mechanism comprises an upper shearing fork seat and a lower shearing fork seat which are arranged up and down symmetrically, a first hinge shaft is fixedly arranged on the left sides of the upper shearing fork seat and the lower shearing fork seat, a sliding groove is formed on the right sides of the upper shearing fork seat and the lower shearing fork seat, a second hinge shaft is slidingly arranged in the sliding groove, two groups of shearing fork connecting rods are arranged between the upper shearing fork seat and the lower shearing fork seat, the two groups of shearing fork connecting rods are arranged in a front-back symmetrical mode, the four ends of the shearing fork connecting rods are respectively hinged with the first hinge shaft and the second hinge shaft on the upper shearing fork seat and the lower shearing fork seat, a pushing block is fixedly connected on the second hinge shaft on the lower shearing fork seat, the pushing block is in sliding connection with the lower shearing fork seat, a screw rod is in threaded connection with the pushing block, the screw rod is fixedly connected with an output shaft of a driving motor, the driving motor is fixedly arranged on the ground or a rack, the driving motor is electrically connected with the driver, the driver is electrically connected with the single chip microcomputer, a bottom plate is fixedly arranged on the upper end face of the upper shearing fork seat, four Hooke hinges are fixedly arranged on the bottom plate in a front-back and left-right symmetrical mode, a first connecting rod is fixedly connected to the upper end of the Hooke hinge, a second connecting rod and a push rod arm are hinged to the upper end of the first connecting rod through a third hinging shaft, the upper end of the second connecting rod is hinged to the spherical hinging seat in a spherical hinging mode, the spherical hinging seat is fixedly arranged on the compensation plate, the four spherical hinging seats are symmetrically arranged in a front-back and left-right mode, the push rod arms are connected with piston rods of the push hydraulic cylinders, the cylinder bodies of the push hydraulic cylinders are hinged to side plates, and the side plates are fixedly connected.
The roll gap compensation method of the rolling mill comprises the following steps:
s1, a detection feedback mechanism is arranged on a frame, meanwhile, lines are connected, and zero setting calibration is carried out on a first strain gauge to a twelve strain gauges on a singlechip;
s2, installing an executing mechanism, and fixing the lower shearing fork seat on the ground to enable the compensating plate to be in contact with the lower surface of the roller supporting seat;
s3, setting mechanical reference parameters
and />
, wherein ,/>
，/>
，/>
The stress is the proportional limit of the frame material;
s4, starting the detection feedback mechanism, and receiving a voltage signal of an output port of the left detection module by the singlechip
Voltage signal of output port of right side detection module +.>
And the voltage signal of the output port of the supporting seat detection module +.>
；
S5, analyzing the voltage signal of the output port of the left detection module
The relationship between the input voltage and the output voltage in the left detection module can be expressed as:
wherein ,
representing the voltage at the input port of the left detection module, a +.>
、/>
、/>
、/>
Respectively representing the resistance value change quantity of the first strain gauge, the second strain gauge, the third strain gauge and the fourth strain gauge after being strained, and +.>
、/>
、/>
、/>
The resistance values of the first strain gauge, the second strain gauge, the third strain gauge and the fourth strain gauge in the initial zero setting calibration state are respectively represented, and when the specifications of the first strain gauge, the second strain gauge, the third strain gauge and the fourth strain gauge are completely the same, the first strain gauge, the second strain gauge, the third strain gauge and the fourth strain gauge are respectively represented>
and />
The relationship of (2) satisfies the following formula:
wherein ,
indicating the sensitivity of strain gauge number one, < >>
Poisson's ratio, indicative of frame material, +.>
The strain of the second strain gauge and the third strain gauge due to bending moment is represented;
according to the formula (102), the strain generated by the bending moment of the second strain gauge and the third strain gauge can be calculated by
and />
The representation is:
rolling force applied to the cross section of the frame where the left detection module is located
Can be expressed as:
wherein ,
for the rolling force applied at the cross section of the frame where the left detection module is located +.>
For the modulus of elasticity of the material at the cross section of the frame where the left detection module is located +.>
The cross-sectional area of the frame at the position of the left detection module;
s6, analyzing the voltage signal of the output port of the right detection module
Since the left side detection module and the right side detection module have the same structure, there is +.>
and />
The principle of analysis is the same, so the rolling force applied to the cross section of the frame where the right detection module is located +.>
Can be expressed as:
wherein ,
for the rolling force applied at the cross section of the frame where the right detection module is located +.>
For the modulus of elasticity of the material at the cross section of the frame where the right detection module is located, +.>
Cross-sectional area of the housing for the position of the right detection module,/->
The strain of the fifth strain gauge and the sixth strain gauge due to bending moment is shown;
s7, analyzing voltage signals of output ports of the supporting seat detection module
The relationship between the output voltage and the input voltage in the support seat detection module can be expressed as: />
wherein 
Representing the voltage of the output port of the support seat detection module, < >>
Representing the voltage of the input port of the support seat detection module, < >>
、/>
、/>
、/>
Respectively showing the resistance change amounts of the strain gauge nine, the strain gauge ten, the strain gauge eleven and the strain gauge twelve after the strain is generated, and (2)>
、/>
、/>
、/>
The resistance values of the strain gauge nine, the strain gauge ten, the strain gauge eleven and the strain gauge twelve in the initial zero setting calibration state are respectively shown, and when the specifications of the strain gauge nine, the strain gauge eleven and the strain gauge twelve are completely the same>
and />
The relationship satisfies the following equation:
wherein 
Indicating the sensitivity of the strain gauge No. nine, < ->
Poisson's ratio, indicative of the material of the roll stand,/>
The strain of the ten-gauge strain gauge and the eleven-gauge strain gauge due to bending moment is shown;
according to the formula (107), the strain of the ten-gauge strain and the eleven-gauge strain caused by the bending moment can be calculated by
and />
The representation is:
the bending moment expression at the roll stand is:
wherein 
Representing the bending moment in the y-axis direction, i.e. the bending moment generated during rolling and acting on the roll stand; z represents the dimension of the rolling mill roll shaft support plate in the z-axis direction,/->
Representing the modulus of elasticity of the roll stand, +.>
Representing the cross-sectional area of the roll stand;
s8, detecting the left side through the singlechipMeasuring rolling force exerted on cross section of position of module
The rolling force exerted on the cross section of the position where the right detection module is located>
And mechanical reference parameters->
、/>
Comparing, and controlling the action of the executing mechanism according to a comparison result, wherein the action specifically comprises the following steps:
s81, under the initial condition, the compensation plate is attached to the lower surface of the roller supporting seat, and a singlechip driving command is waited for;
s82, when detecting
Is not zero and->
Or->
At least one of the parameters is not zero, indicating that the rolling mill starts rolling operation, and entering parameter comparison;
s83, when detecting
Or->
When the single chip microcomputer sends a control instruction to the driver, the electric compensation mechanism is triggered, the driving motor starts to work, the upper scissor seat is lifted, and a supporting force is formed on the roller supporting seat until the condition +.>
and />
Then, the driving motor stops working, the upper shearing fork seat stops ascending, and the roll gap compensation work is completed;
s84, when detecting
Or->
When the hydraulic compensation mechanism is triggered, the singlechip sends out a command to control and push the hydraulic cylinder to act, so that the compensation plate rises to form supporting force on the roller supporting seat until the condition is met
and />
And then, pushing the hydraulic cylinder to stop working, and stopping lifting the compensation plate to finish the roll gap compensation work. />
Compared with the prior art, the invention has the following advantages:
according to the invention, the strain gauge is adopted as a mechanical parameter acquisition sensor, and the single chip microcomputer controls the driving motor and the pushing hydraulic cylinder to respectively perform roll gap compensation actions aiming at different rolling conditions, so that the thickness control of the plate is realized, and the defects of complex parameter setting of a compensation device, high equipment cost and complex equipment structure can be avoided;
the hardware parts of the invention are assembled by adopting standard parts, the equipment cost is low, and a large amount of equipment is easy to realize; the invention has two conventional roll gap compensation control methods, can automatically select according to the rolling condition, and improves the roll gap compensation control efficiency; the device has fewer types of parameters required for acquisition and control, is easy to reduce operation time and improves control efficiency;
the device has wide adaptation range of the detection feedback mechanism, and can select strain gauges with different specifications according to different characteristics of rough rolling and finish rolling processes.
Drawings
FIG. 1 is a schematic diagram of the installation of a detection feedback mechanism of the present invention;
FIG. 2 is a cross-sectional view of section A-A of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic diagram of the circuit connection of the left detection module of the present invention;
FIG. 4 is a cross-sectional view of section B-B of FIG. 1 in accordance with the present invention;
FIG. 5 is a schematic diagram of the circuit connection of the right detection module of the present invention;
FIG. 6 is a schematic diagram illustrating the installation of a support base detection module according to the present invention;
FIG. 7 is a schematic diagram of circuit connection of the support base detection module of the present invention;
FIG. 8 is a schematic diagram of an actuator mechanism according to the present invention;
FIG. 9 is a schematic diagram of connection control of the SCM of the present invention;
in the figure, a first strain gauge-1, a second strain gauge-2, a third strain gauge-3, a fourth strain gauge-4, a fifth strain gauge-5, a sixth strain gauge-6, a seventh strain gauge-7, a eighth strain gauge-8, a ninth strain gauge-9, a tenth strain gauge-10, an eleventh strain gauge-11, a twelfth strain gauge-12, a singlechip-13, an upper shearing fork seat-14, a lower shearing fork seat-15, a first hinge shaft-16, a chute-17, a second hinge shaft-18, a shearing fork connecting rod-19, a pushing block-20, a lead screw-21, a driving motor-22, a driver-23, a bottom plate-24, a hook hinge-25, a first connecting rod-26, a third hinge shaft-27, a second connecting rod-28, a push rod arm-29, a spherical hinge seat-30, a compensating plate-31, a pushing hydraulic cylinder-32, a side plate-33, a frame-34, and a roller supporting seat-35.
Detailed Description
In order to further illustrate the technical scheme of the invention, the invention is further illustrated by the following examples.
As shown in fig. 1 to 9, the rolling mill roll gap compensation device comprises a detection feedback mechanism and an executing mechanism;
the detection feedback mechanism comprises a left detection module, a right detection module and a supporting seat detection module, wherein the left detection module is arranged on the left side of the frame 34 and positioned between an upper roller and a lower roller, and comprises a first strain gauge 1, a second strain gauge 2, a third strain gauge 3 and a fourth strain gauge 4, wherein the first strain gauge 1 and the second strain gauge 2 are fixed on the front side of the frame 34, the first strain gauge 1 and the second strain gauge 2 are placed in an orthogonal pose, namely one of the first strain gauge 1 and the second strain gauge 2 is transversely placed, the other is vertically placed, the third strain gauge 3 and the fourth strain gauge 4 are fixed on the rear side of the frame 34, the third strain gauge 3 is positioned on the rear side of the first strain gauge 1, the strain gauge No. 4 is positioned at the rear side of the strain gauge No. 2, the strain gauge No. 3 and the strain gauge No. 1 as well as the strain gauge No. 4 and the strain gauge No. 2 are placed in an orthogonal position, the strain gauge No. 1, the strain gauge No. 2, the strain gauge No. 3 and the strain gauge No. 4 are sequentially connected in series by using a wire according to serial numbers, finally the strain gauge No. 1 and the strain gauge No. 4 are connected in series by using a wire, one wire is led out between the strain gauge No. 1 and the strain gauge No. 2 and between the strain gauge No. 3 and the strain gauge No. 4 as an output voltage preset port, and one wire is led out between the strain gauge No. 1 and the strain gauge No. 3 and between the strain gauge No. 2 and the strain gauge No. 4 as an input voltage preset port; the right detection module is arranged on the right side of the frame 34 and positioned between the upper roller and the lower roller, and comprises a fifth strain gauge 5, a sixth strain gauge 6, a seventh strain gauge 7 and an eighth strain gauge 8, and the installation mode and the wiring mode of the right detection module are the same as those of the left detection module; the supporting seat detection module comprises a nine-strain gauge 9, a ten-strain gauge 10, an eleven-strain gauge 11 and a twelve-strain gauge 12, wherein the nine-strain gauge 9 and the ten-strain gauge 10 are fixed on the upper surface of the roller supporting seat 35, and the nine-strain gauge 9 and the ten-strain gauge 10 are placed in an orthogonal pose, the eleven strain gauge 11 and the twelve strain gauge 12 are fixed on the lower surface of the roller supporting seat 35, the eleven strain gauge 11 is positioned on the lower side of the nine strain gauge 9, the twelve strain gauge 12 is positioned on the lower side of the ten strain gauge 10, the nine strain gauge 9, the eleven strain gauge 11, the ten strain gauge 10 and the twelve strain gauge 12 are placed in an orthogonal pose, the strain gauge 9, the strain gauge 11, the strain gauge 10 and the strain gauge 12 are connected in series by wires in sequence, and finally the strain gauge 9 and the strain gauge 12 are connected in series by wires, one wire is led out between the nine-strain gauge 9 and the eleven-strain gauge 11 and between the ten-strain gauge 10 and the twelve-strain gauge 12 to serve as an input voltage preset port, and one wire is led out between the nine-strain gauge 9 and the twelve-strain gauge 12 and between the ten-strain gauge 10 and the eleven-strain gauge 11 to serve as an output voltage preset port; input voltage preset ports in the left detection module, the right detection module and the supporting seat detection module are all connected in parallel to a constant voltage power supply, the constant voltage power supply supplies power, and output voltage ports in the left detection module, the right detection module and the supporting seat detection module are respectively connected in parallel and then are connected into I/O interfaces of the single chip microcomputer 13 in three ways;
the actuating mechanism is contacted with the roller supporting seat 35 and is used for making corresponding supporting actions according to signals of the detection feedback mechanism so as to realize the compensation of the roller gap;
the actuating mechanism comprises an upper shearing fork seat 14 and a lower shearing fork seat 15 which are arranged vertically symmetrically, a first hinging shaft 16 is fixedly arranged on the left sides of the upper shearing fork seat 14 and the lower shearing fork seat 15, a sliding groove 17 is formed on the right sides of the upper shearing fork seat 14 and the lower shearing fork seat 15, a second hinging shaft 18 is arranged in the sliding groove 17 in a sliding manner, two groups of shearing fork connecting rods 19 are arranged between the upper shearing fork seat 14 and the lower shearing fork seat 15, the two groups of shearing fork connecting rods 19 are arranged vertically symmetrically, four ends of the shearing fork connecting rods 19 are respectively hinged with the first hinging shaft 16 and the second hinging shaft 18 on the upper shearing fork seat 14 and the lower shearing fork seat 15, a pushing block 20 is fixedly connected with the second hinging shaft 18 on the lower shearing fork seat 15, a lead screw 21 is connected with the pushing block 20 in a sliding manner, the lead screw 21 is fixedly connected with an output shaft of a driving motor 22, the driving motor 22 is fixedly arranged on the ground or a rack 34, the driving motor 22 is electrically connected with the driver 23, the driver 23 is electrically connected with the single chip microcomputer 13, a bottom plate 24 is fixedly arranged on the upper end face of the upper shearing fork seat 14, four Hooke hinges 25 are fixedly arranged on the bottom plate 24 in a front-back left-right symmetrical manner, a first connecting rod 26 is fixedly connected with the upper end of the Hooke hinge 25, a second connecting rod 28 and a push rod arm 29 are hinged to the upper end of the first connecting rod 26 through a third hinging shaft 27, the upper end of the second connecting rod 28 is hinged to a spherical hinging seat 30 in a spherical hinging manner, the spherical hinging seat 30 is fixedly arranged on a compensating plate 31, four spherical hinging seats 30 are symmetrically arranged in a front-back left-right manner, the push rod arms 29 are connected with piston rods of a push hydraulic cylinder 32, the cylinder body of the push hydraulic cylinder 32 is hinged to a side plate 33, the side plate 33 is fixedly connected with the bottom plate 24.
The roll gap compensation method of the rolling mill comprises the following steps:
s1, a detection feedback mechanism is arranged on a rack 34, meanwhile, lines are connected, and zero setting calibration is carried out on a first strain gauge 1 to a twelve strain gauges 12 on a singlechip 13;
s2, installing an executing mechanism, and fixing the lower scissor seat 15 to the ground so that the compensating plate 31 is in contact with the lower surface of the roller supporting seat 35;
s3, setting mechanical reference parameters
and />
, wherein ,/>
，/>
，/>
The stress is the proportional limit of the frame material;
s4, starting a detection feedback mechanism, and receiving a voltage signal of an output port of the left detection module by the singlechip 13
Voltage signal of output port of right side detection module +.>
And the voltage signal of the output port of the supporting seat detection module +.>
；
S5, analyzing the voltage signal of the output port of the left detection module
The relationship between the input voltage and the output voltage in the left detection module can be expressed as:
wherein ,
representing the voltage at the input port of the left detection module, a +.>
、/>
、/>
、/>
Respectively representing the resistance value change quantity of the first strain gauge 1, the second strain gauge 2, the third strain gauge 3 and the fourth strain gauge 4 after being strained, and the +.>
、/>
、/>
、
Respectively representing the resistance values of the first strain gauge 1, the second strain gauge 2, the third strain gauge 3 and the fourth strain gauge 4 in the initial zero setting calibration state, and when the specifications of the first strain gauge 1, the second strain gauge 2, the third strain gauge 3 and the fourth strain gauge 4 are completely the same, the device is used for the improvement of the resistance value>
and />
The relationship of (2) satisfies the following formula:
wherein ,
indicating the sensitivity of strain gauge 1, < >>
Poisson's ratio, indicative of frame material, +.>
The strain of the second strain gauge 2 and the third strain gauge 3 due to bending moment is shown;
according to the formula (102), the strain generated by the bending moment of the second strain gauge 2 and the third strain gauge 3 can be calculated by
and />
The representation is:
the rolling force applied to the cross section of the frame 34 where the left detection module is located
Can be expressed as:
wherein ,
for the rolling forces to which the cross section of the frame 34 where the left detection module is located is subjected +.>
For the modulus of elasticity of the material at the cross section of the frame 34 where the left detection module is located, +.>
The cross-sectional area of the housing 34 where the left detection module is located;
s6, analyzing the voltage signal of the output port of the right detection module
Since the left side detection module and the right side detection module have the same structure, there is +.>
and />
The principle of analysis is the same, so the rolling force applied to the cross section of the frame 34 where the right detection module is located is +.>
Can be expressed as:
wherein ,
rolling forces applied to the cross section of the frame 34 at the location of the right detection module +.>
For the modulus of elasticity of the material at the cross section of the housing 34 where the right detection module is located, +.>
Cross-sectional area of the housing 34 for the location of the right detection module,/->
The strain of the strain gauge 5 and the strain gauge 6 due to bending moment is shown;
s7, analyzing voltage signals of output ports of the supporting seat detection module
The relationship between the output voltage and the input voltage in the support seat detection module can be expressed as:
wherein 
Representing the voltage of the output port of the support seat detection module, < >>
Representing the voltage of the input port of the support seat detection module, < >>
、/>
、/>
、/>
The resistance change amounts after the strain of the strain gauge No. 9, the strain gauge No. 10, the strain gauge No. 11 and the strain gauge No. 12 are respectively shown in +.>
、/>
、/>
、/>
The resistance values of the nine-gauge strain gauge 9, the ten-gauge strain gauge 10, the eleven-gauge strain gauge 11 and the twelve-gauge strain gauge 12 in the initial zero setting calibration state are respectively shown, when the gauge of the strain gauge sheet No. 9, the strain gauge sheet No. 10, the strain gauge sheet No. eleven 11 and the strain gauge sheet No. twelve 12 are identical, the +.>
and />
The relationship satisfies the following equation:
wherein 
Indicating the sensitivity of strain gauge No. 9, < ->
Poisson's ratio, representing the material of the roll stand 35, < >>
The strain of the ten-gauge 10 and the eleven-gauge 11 due to the bending moment is shown;
according to the formula (107), the strain of the ten-gauge strain gauge 10 and the eleven-gauge strain gauge 11 due to the bending moment can be obtained by
And
the representation is:
the bending moment expression at the roll stand 35 is:
wherein 
A bending moment in the y-axis direction, i.e. a bending moment generated during rolling and acting on the roll stand 35; z represents the dimension of the rolling mill roll shaft support plate in the z-axis direction,/->
Representing the modulus of elasticity of the roll holder 35 +.>
Showing the cross-sectional area of the roll stand 35;
s8, rolling force applied to the cross section of the position of the left detection module through the singlechip 13
The rolling force exerted on the cross section of the position where the right detection module is located>
And mechanical reference parameters->
、/>
Comparing, and controlling the action of the executing mechanism according to a comparison result, wherein the action specifically comprises the following steps:
s81, under the initial condition, the compensation plate 31 is attached to the lower surface of the roller supporting seat 35, and a single chip microcomputer 13 driving command is waited for;
s82, when detecting
Is not zero and->
Or->
At least one of the parameters is not zero, indicating that the rolling mill starts rolling operation, and entering parameter comparison;
s83, when detecting
Or->
When in use, the singlechip 13 sends a control instruction to the driver 23 to trigger the electric compensation mechanism, the driving motor 22 starts working to lift the upper scissor seat 14 and form supporting force for the roller supporting seat 35 until the condition ∈10 is satisfied>
and />
After that, the driving motor 22 stops working, the upper scissor seat 14 stops ascending, and the roll gap compensation work is completed;
s84, when detecting
Or->
When the hydraulic compensation mechanism is triggered, the singlechip 13 sends out a command to control the pushing hydraulic cylinder 32 to act, so that the compensation plate 31 rises to form supporting force on the roller supporting seat 35 until the condition +.>
and />
After that, the hydraulic cylinder 32 is pushed to stop working, the compensating plate 31 stops rising, and the roll gap compensation work is completed.
While the principal features and advantages of the present invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (3)
1. The rolling mill roll gap compensation device is characterized in that: comprises a detection feedback mechanism and an executing mechanism;
the detection feedback mechanism comprises a left detection module, a right detection module and a support seat detection module, wherein the left detection module is arranged on the left side of a frame (34) and is positioned between an upper roller and a lower roller, the detection feedback mechanism comprises a first strain gauge (1), a second strain gauge (2), a third strain gauge (3) and a fourth strain gauge (4), wherein the first strain gauge (1) and the second strain gauge (2) are fixed on the front side of the frame (34), the first strain gauge (1) and the second strain gauge (2) are placed in an orthogonal pose, the third strain gauge (3) and the fourth strain gauge (4) are fixed on the rear side of the frame (34), the third strain gauge (3) is positioned on the rear side of the first strain gauge (1), the fourth strain gauge (4) is positioned on the rear side of the second strain gauge (2), the third strain gauge (3) and the fourth strain gauge (4) are placed in an orthogonal pose, the fourth strain gauge (2) and the fourth strain gauge (4) are connected in series with the wire in sequence according to the serial number of the first strain gauge (4), one lead is led out between the first strain gauge (1) and the second strain gauge (2) and between the third strain gauge (3) and the fourth strain gauge (4) to serve as an output voltage preset port, and one lead is led out between the first strain gauge (1) and the third strain gauge (3) and between the second strain gauge (2) and the fourth strain gauge (4) to serve as an input voltage preset port; the right detection module is arranged on the right side of the frame (34) and positioned between the upper roller and the lower roller, and comprises a fifth strain gauge (5), a sixth strain gauge (6), a seventh strain gauge (7) and an eighth strain gauge (8), and the installation mode and the wiring mode of the right detection module are the same as those of the left detection module; the supporting seat detection module comprises a nine-strain gauge (9), a ten-strain gauge (10), an eleven-strain gauge (11) and a twelve-strain gauge (12), wherein the nine-strain gauge (9) and the ten-strain gauge (10) are fixed on the upper surface of a roller supporting seat (35), the nine-strain gauge (9) and the ten-strain gauge (10) are placed in an orthogonal pose, the eleven-number strain gauge (11) and the twelve-number strain gauge (12) are fixed on the lower surface of the roller supporting seat (35), the eleven-number strain gauge (11) is positioned on the lower side of the nine-number strain gauge (9), the twelve-number strain gauge (12) is positioned on the lower side of the ten-number strain gauge (10), the strain gauge with nine numbers (9) and eleven numbers (11) and the strain gauge with ten numbers (10) and twelve numbers (12) are placed in an orthogonal pose, the nine-gauge strain gauge (9), the eleven-gauge strain gauge (11), the ten-gauge strain gauge (10) and the twelve-gauge strain gauge (12) are connected in series by wires in sequence, the strain gauge nine (9), the strain gauge eleven (11) the ten-gauge strain gauge (10) and the twelve-gauge strain gauge (12) are connected in series by a lead in sequence, between the nine-strain gauge (9) and the twelve-strain gauge (12) and the ten-strain gauge @. A wire is led out between the 10) and the eleven strain gauge (11) as an output voltage preset port; input voltage preset ports in the left detection module, the right detection module and the supporting seat detection module are all connected in parallel to a constant voltage power supply, the constant voltage power supply supplies power, and output voltage ports in the left detection module, the right detection module and the supporting seat detection module are respectively connected in parallel and then are connected into I/O interfaces of a single chip microcomputer (13) in three ways;
the actuating mechanism is contacted with the roller supporting seat (35) and is used for carrying out corresponding supporting actions according to signals of the detection feedback mechanism so as to realize the compensation of the roller gap.
2. The rolling mill roll gap compensation device according to claim 1, further characterized in that: the actuating mechanism comprises an upper shearing fork seat (14) and a lower shearing fork seat (15) which are arranged vertically symmetrically, a first hinge shaft (16) is fixedly arranged on the left side of the upper shearing fork seat (14) and the left side of the lower shearing fork seat (15), a sliding groove (17) is formed in the right side of the upper shearing fork seat (14) and the right side of the lower shearing fork seat (15), a second hinge shaft (18) is arranged in the sliding groove (17) in a sliding manner, two groups of shearing fork connecting rods (19) are arranged between the upper shearing fork seat (14) and the lower shearing fork seat (15), the two groups of shearing fork connecting rods (19) are arranged in a front-back symmetrical manner, four ends of the shearing fork connecting rods (19) are respectively hinged with the first hinge shaft (16) and the second hinge shaft (18) on the upper shearing fork seat (14) and the lower shearing fork seat (15), a pushing block (20) is fixedly connected to the second hinge shaft (18) on the lower shearing fork seat (15), the pushing block (20) is electrically connected with a lower motor (21) in a sliding manner, the driving motor (21) is fixedly connected with a screw rod (23) or a screw rod (23) is fixedly connected with the driving motor (21) and the screw rod (23), the upper end face of the upper shearing fork seat (14) is fixedly provided with a bottom plate (24), four hook hinges (25) are fixedly arranged on the bottom plate (24) in a front-back and left-right symmetrical mode, a first connecting rod (26) is fixedly connected to the upper end of the hook hinges (25), a second connecting rod (28) and a push rod arm (29) are hinged to the upper end of the first connecting rod (26) through a third hinging shaft (27), the upper end of the second connecting rod (28) is hinged to a spherical hinging seat (30) in a spherical hinging mode, the spherical hinging seat (30) is fixedly arranged on a compensation plate (31), four spherical hinging seats (30) are symmetrically arranged in a front-back and left-right mode, the push rod arm (29) is connected with a piston rod of a push hydraulic cylinder (32), and a cylinder body of the push hydraulic cylinder (32) is hinged to a side plate (33), and the side plate (33) is fixedly connected with the bottom plate (24).
3. The rolling mill roll gap compensation method of the rolling mill roll gap compensation device according to claim 2, characterized in that: the method comprises the following steps:
s1, a detection feedback mechanism is arranged on a rack (34), meanwhile, lines are connected, and zero setting calibration is carried out on a first strain gauge (1) to a twelve strain gauge (12) on a singlechip (13);
s2, installing an executing mechanism, and fixing the lower shearing fork seat (15) on the ground so that the compensating plate (31) is in contact with the lower surface of the roller supporting seat (35);
s3, setting mechanical reference parameters
and />
, wherein ,/>
，/>
，/>
The stress is the proportional limit of the frame material;
s4, starting a detection feedback mechanism, and receiving a voltage signal of an output port of the left detection module by a singlechip (13)
Voltage signal of output port of right side detection module +.>
And the voltage signal of the output port of the supporting seat detection module +.>
；
S5, analyzing the voltage signal of the output port of the left detection module
The relationship between the input voltage and the output voltage in the left detection module can be expressed as:
wherein ,
representing the voltage at the input port of the left detection module, a +.>
、/>
、/>
、/>
Respectively representing the resistance value change quantity after the strain of the first strain gauge (1), the second strain gauge (2), the third strain gauge (3) and the fourth strain gauge (4), and>
、/>
、/>
、/>
respectively representing the resistance values of the first strain gauge (1), the second strain gauge (2), the third strain gauge (3) and the fourth strain gauge (4) in the initial zero setting calibration state, and when the specifications of the first strain gauge (1), the second strain gauge (2), the third strain gauge (3) and the fourth strain gauge (4) are completely the same, the first strain gauge is a new strain gauge>
and />
The relationship of (2) satisfies the following formula:
wherein ,
indicating the sensitivity of the strain gauge number one (1)>
Poisson's ratio, indicative of frame material, +.>
The strain of the second strain gauge (2) and the third strain gauge (3) caused by bending moment is shown;
according to the formula (102), the strain generated by the bending moment of the second strain gauge (2) and the third strain gauge (3) can be calculated by
and />
The representation is:
rolling force applied to cross section of frame (34) where left detection module is located
Can be expressed as:
wherein ,
for the rolling force exerted on the cross section of the frame (34) at the location of the left detection module +.>
For the modulus of elasticity of the material at the cross section of the frame (34) where the left detection module is located, +.>
A cross-sectional area of the housing (34) at the location of the left detection module;
s6, analyzing the voltage signal of the output port of the right detection module
Since the left side detection module and the right side detection module have the same structure, there is +.>
and />
The analysis principle of (a) is the same, so the rolling force applied to the cross section of the frame (34) where the right detection module is located is +.>
Can be expressed as:
wherein ,
rolling force applied to the cross section of the frame (34) at the position of the right detection module>
For the modulus of elasticity of the material at the cross section of the frame (34) where the right detection module is located, +.>
For the cross-sectional area of the frame (34) where the right detection module is located, < >>
The strain of the fifth strain gauge (5) and the sixth strain gauge (6) due to bending moment is shown;
s7, analyzing voltage signals of output ports of the supporting seat detection module
The relationship between the output voltage and the input voltage in the support seat detection module can be expressed as:
wherein 
Representing the voltage of the output port of the support seat detection module, < >>
Representing the voltage of the input port of the support seat detection module, < >>
、/>
、/>
、/>
Respectively showing the resistance value change quantity of the strain gauge nine (9), the strain gauge ten (10), the strain gauge eleven (11) and the strain gauge twelve (12), and +_>
、/>
、/>
、/>
Respectively show a nine-gauge strain gauge (9), a ten-gauge strain gauge (10) the eleven-number strain gauge (11) and the twelve-number strain gauge (12) are used for initially zeroing the resistance value under the calibration state, when the specification of the strain gauge sheet No. nine (9), the strain gauge sheet No. ten (10), the strain gauge sheet No. eleven (11) and the strain gauge sheet No. twelve (12) are identical, the strain gauge sheet is +.>
and />
The relationship satisfies the following equation:
wherein 
Indicating the sensitivity of strain gauge No. (9)>
Poisson's ratio, representing the material of the roll stand (35)>
The strain of the ten-gauge strain gauge (10) and the eleven-gauge strain gauge (11) due to bending moment is shown;
according to the formula (107), the strain generated by bending moment of the ten-gauge strain gauge (10) and the eleven-gauge strain gauge (11) can be calculated by
And
the representation is:
the bending moment expression at the roll stand (35) is:
wherein 
Representing a bending moment in the y-axis direction, i.e. a bending moment generated during rolling and acting on the roll stand (35); z represents the dimension of the rolling mill roll shaft support plate in the z-axis direction,/->
Represents the modulus of elasticity, < >>
Representing the cross-sectional area of the roll stand (35);
s8, rolling force applied to the cross section of the position of the left detection module through the singlechip (13)
The rolling force exerted on the cross section of the position where the right detection module is located>
And mechanical reference parameters->
、/>
Comparing, and controlling the action of the executing mechanism according to a comparison result, wherein the action specifically comprises the following steps:
s81, under the initial condition, the compensation plate (31) is attached to the lower surface of the roller supporting seat (35) and waits for a driving command of the singlechip (13);
s82, when detecting
Is not zero and->
Or->
At least one of the parameters is not zero, indicating that the rolling mill starts rolling operation, and entering parameter comparison;
s83, when detecting
Or->
When the single-chip microcomputer (13) is used for driving the driver (23)Sending out a control command to trigger an electric compensation mechanism, and driving a motor (22) to start working, so that an upper shearing fork seat (14) is lifted to form supporting force on a roller supporting seat (35) until a condition +.>
and />
Then, the driving motor (22) stops working, the upper shearing fork seat (14) stops ascending, and the roll gap compensation is completed;
s84, when detecting
Or->
When the hydraulic compensation mechanism is triggered, the singlechip (13) sends out a command to control the pushing hydraulic cylinder (32) to act, so that the compensation plate (31) rises to form supporting force on the roller supporting seat (35) until the condition ∈10 is met>
and />
And then, the hydraulic cylinder (32) is pushed to stop working, the compensation plate (31) stops rising, and the roll gap compensation work is completed. />
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| CN202310289389.5A CN115990618B (en) | 2023-03-23 | 2023-03-23 | Rolling mill roll gap compensation device and method |
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