US20140137617A1 - Pinch roll device for rolled metallurgic products - Google Patents
Pinch roll device for rolled metallurgic products Download PDFInfo
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- US20140137617A1 US20140137617A1 US14/131,388 US201214131388A US2014137617A1 US 20140137617 A1 US20140137617 A1 US 20140137617A1 US 201214131388 A US201214131388 A US 201214131388A US 2014137617 A1 US2014137617 A1 US 2014137617A1
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- Prior art keywords
- roll
- rolls
- hydraulic
- pressure
- pinch roll
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/006—Pinch roll sets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
Definitions
- the present invention relates to a pinch roll device for rolled metallurgic products.
- pinch roll devices comprising systems for monitoring both the distance between the rolls and the pressure exerted by the rolls on the product when rolling.
- Another object is to make available a new pinch roll device for rolled metallurgic products which is completely automatic and which does not require any manual intervention by the operator, e.g. for compensating roll wear.
- a further object is to allow a high through speed, up to 150 m/s, of the product between the rolls to be achieved.
- Another object of the present invention is to make available a pinch roll device controlled by a hydraulic circuit having size, in terms of length of the hydraulic line and amount of operating fluid, much smaller than the prior art.
- a further object is to make available an operation method for the above-mentioned pinch roll device.
- the invention relates to a pinch roll device for rolled metallurgic products comprising:
- a pinch roll device can be obtained, in which both the distance between the rolls and the thrust on the rolls when rolling are controlled in an optimized manner thus ensuring a continuous, even contact between rolls and rolled product.
- the invention relates to an operation method of a pinch roll device for rolled metallurgic products, said device comprising:
- said method comprising:
- the present invention allows to obtain a method of operating a pinch roil device for metallurgic products with an optimized control comprising a step of checking the position, which allows to set the distance between the rolls before the passage of the product, and a step of checking the pressure, which allows to adjust the roll thrust when rolling.
- the two steps are carried out alternatively with respect to each other, allowing to optimize the control cycle which thus may be carried out rapidly, thus favoring an increase of the through speed of the product between rolls.
- Including a first roll and a second roll reciprocally interconnected by means of a mechanical and/or hydraulic connection allows to reciprocally approach or space apart the two rolls in a symmetric manner with respect to the crossing axis, so as to accurately and effectively control the size of the passage gap.
- the hydraulic actuator being directly active on only one of the two rolls, while the other is controlled by a geared transmission between the two rolls allows to synchronize the movement due to the direct coupling of the first and second rolls, in a simpler manner than the other known solutions, e.g. the one in U.S. Pat. No. 6,920,772, where a mechanical linkage transmission connects the operating member to both rolls.
- the use of two hydraulic actuators respectively acting on the two rolls and connected to each other by means of a compensation circuit allows to obtain the same operating accuracy and the same constructional simplicity.
- Using a hydraulic control circuit further allows to obtain a stabilization of the system by damping the stresses between rolls and rolled product operated by the hydraulic fluid.
- the hydraulic circuit being closed and pressurized allows to have very small size with respect to the typical hydraulic circuits which include a hydraulic unit.
- a reversible pump controlled by an electric motor controlled in turn by a control unit connected to the position and pressure sensors, allows to implement a hydroelectric type control system in which the hydraulic part is used to control the reciprocal approach or spacing apart of the rolls, while the electric part allows to effectively obtain position and pressure feedback control.
- This allows to advantageously integrate the features of the hydraulic systems, in particular the possibility of exerting high pressures, with the features of the electric systems, in particular control speed and reliability.
- Using the reversible pump controlled by the electric motor allows to omit the servo valve normally used in hydraulic circuits and to additionally decrease the amount of fluid needed by the hydraulic circuit and the overall length thereof.
- FIG. 1 is a diagrammatic view of a pinch roll device for rolled metallurgical products in accordance with the present invention
- FIG. 2 is a front view of some of the components of the device in FIG. 1 ;
- FIG. 3 is a side view of the components in FIG. 2 .
- FIG. 4 is a diagrammatic view of a constructional variant of the device in FIG. 1 .
- FIG. 5 is a block diagram of a method for operating a pinch roll device for rolled metallurgic products in accordance with the present invention.
- a pinch roll device for a round-section, rolled metallurgic product is indicated by reference numeral 1 as a whole.
- a pinch roll device provided in accordance with the present invention may be appropriately configured to hold any rolled metallurgic product, e.g. a flat-section rolled product.
- Device 1 comprises a first pinch roll 2 and a second pinch roll 3 which is identical to the first roll 3 , between which a substantially circular passage gap 5 for a wire rod 10 is defined.
- Gap 5 defines a crossing axis X, coaxial to gap 5 , with which the wire rod 10 is aligned in operation when passing passage gap 5 .
- the first and second rolls 2 , 3 can rotate about a first rotation axis Y 1 and a second rotation axis Y 2 , respectively, to draw by friction the wire rod 10 through the passage gap 5 .
- the rotation axes Y 1 , Y 2 are parallel to each other and equally spaced apart from the crossing axis X, with respect to which they are arranged on the opposite side.
- the shape and size of gap 5 comply with those of the wire rod 10 , and gap 5 is delimited by two annular grooves 5 a, 5 b provided on the cylindrical peripheral surface of the pinch rolls 2 , 3 , respectively.
- the first and second rolls 2 , 3 are restrained to a first lever arm 7 and second lever arm 8 , respectively, so as to rotate about respective rotation axes Y 1 , Y 2 .
- the rotation of the pinch rolls 2 , 3 about the respective axes Y 1 , Y 2 , integral with the first and second arms 7 , 8 , respectively, is obtained by means of a conventional and known actuator comprising a drive motor (not shown) connected to the rolls by means of a transmission comprising a pair of driven toothed wheels 2 a, 3 a, coaxial with axes Y 1 , Y 2 , and a pair of drive toothed wheels 2 b, 3 b, meshing with each other so as to be counter-rotating.
- the driven toothed wheels 2 a, 3 a mesh with the toothed drive wheels 2 b, 3 b, respectively, from which they receive motion.
- the rotation motion is transmitted by the drive motor to the toothed drive wheel 3 b, by means of a motion output shaft 3 c.
- the motion is transmitted from the drive toothed wheel 3 b to the other drive toothed wheel 2 b and to the driven toothed wheel 3 a.
- the motion is transmitted from the drive toothed wheel 2 b to the other driven toothed wheel 2 a. Due to the described coupling, the driven toothed wheels 2 a, 3 a, and therefore the respective rolls 2 , 3 , are counter-rotating.
- the first and second arms 7 , 8 are equal to each other and rotationally supported with respect to a fixed reference system integral with the crossing axis X by means of a pair of respective hinges which define a third rotation axis Z 1 and a fourth rotation axis Z 2 , respectively, which are parallel to each other and equally spaced apart from crossing axis X, respect to which they are arranged on opposite side.
- the first and second arms 7 , 8 can rotate about Z 1 and Z 2 , respectively, to reciprocally either approach or space apart the first and second rolls 2 , 3 , so as to reduce or increase the width of the passage gap 5 , respectively.
- the third and fourth rotation axes Z 1 , Z 2 are spaced apart along the respective arm 7 , 8 , from the first and the second rotation axes Y 1 , Y 2 , respectively, and parallel thereto.
- the four axes Y 1 , Y 2 , Z 1 and Z 2 form a parallel axis system in all operating conditions of device 1 .
- device 1 In order to control the rotation of the lever arms 7 , 8 and therefore to reciprocally approach or space apart the first and the second rolls 2 , 3 , device 1 comprises a hydraulic circuit 20 in which a hydraulic fluid, e.g. oil, circulates and a mechanical gear transmission 11 , by means of which the first and second rolls 2 , 3 are interconnected.
- a hydraulic fluid e.g. oil
- the hydraulic circuit 20 is closed and pressurized, therefore no hydraulic control unit is required, and comprises a hydraulic actuator 21 connected to the first roll 2 to approach it to or space it apart from the second roll 3 .
- the actuator 21 comprises a stem 31 hinged at a free end 31 a thereof to the first lever arm 7 , close to the first roll 2 .
- the translation of stem 31 determines a corresponding rotation of the lever arm 7 about the third rotation axis Z 1 .
- the same rotation is transmitted to the second arm 8 by means of transmission 11 .
- the transmission 11 which thus allows the hydraulic actuator 21 to be connected to the second roll 3 , by means of the first roll 2 , comprises the lever arms 7 , 8 and a gear 12 between the first lever arm 7 and the second lever arm 8 .
- Gear 12 comprises a first toothed sector 12 a and a second toothed sector 12 b integral with the first and second arms 7 , 8 , respectively, and meshing with each other so that each rotation imparted by the actuator 21 to the first arm 7 is transmitted to the second arm 8 .
- the first and second toothed sectors 12 a,b are provided at the end of a third arm 32 and of a fourth arm 33 , respectively, being integral with the first and second arms 7 , 8 , aligned with each other and orthogonal to crossing axis X.
- the arms 32 , 33 are arranged on opposite sides with respect to the crossing axis X so that the first and second toothed sectors 12 a, b mesh with each other at the same crossing axis X.
- the transmission ratio of the gear 12 is unitary so that each rotation of the first arm 7 corresponds to an equal, opposite rotation of the second arm 8 .
- Gear 12 allows to obtain a synchronous, coordinated movement of the first and second lever arms 7 , 8 and of the rolls 2 , 3 restrained thereto. Therefore, the assembly consisting of the first arm 7 and the first roll 2 restrained thereto is equal and symmetric, with respect to axis X, to the assembly of the second arm 8 and the second roll 3 restrained thereto in all operating conditions.
- first and second rolls 2 , 3 are interconnected to each other by means of another type of mechanical connection, free from gears, comprising a plurality of linkages for example.
- the hydraulic actuator 21 is of the double-effect type, comprising a first chamber 21 a and a second chamber 21 b , with a piston 22 connected to stem 31 and to a secondary stem 31 b sliding therebetween and being also opposed to stem 31 and having an equal diameter.
- the hydraulic circuit 20 comprises a reversible pump 9 , connected to the first and second chambers 21 a, b of the actuator by means of a first branch 20 a and a second branch 20 b of the hydraulic circuit 20 , respectively.
- the rotation of the reversible pump 9 in one direction or in the other allows to send oil directly to either one or the other of the chambers 21 a, b of actuator 21 , respectively, thus determining the movement of piston 22 and stem 31 in either one direction or in the opposite direction.
- Pump 9 which controls the movement of piston 22 is operated by an electric motor 9 a ; the position of piston 22 inside the cylinder thus depends on the angular position of the motor 9 a of pump 9 , while the movement speed of the cylinder depends on the angular speed of pump 9 .
- the motor 9 a of pump 9 determines each fluid movement in the hydraulic circuit 20 : therefore, if motor 9 a does not operate the pump 9 , the fluid flow in each point of the hydraulic circuit 20 is substantially zero and the piston 22 does not move.
- a connection branch is provided between the first branch 20 a and the second branch 20 b of the hydraulic circuit 20 , being equipped with a maximum pressure valve 29 calibrated so as to protect the hydraulic circuit from pressure overloads resulting from excessive, even pulsing loads applied to the first roll 2 and transmitted to the actuator 2 through stem 31 .
- the first and second branches 20 a, b are connected upstream of the reversible pump 9 to a top-up source 27 , which allows to top-up any leakage of fluid from the hydraulic circuit 20 .
- a first check valve 28 a and a second check valve 28 b oriented so as to prevent the flow from the pump 9 to the top-up source 27 and to allow the flow in the opposite direction, are provided between the top-up source 27 and the reversible pump 9 on the first and second branches 20 a, b , respectively.
- the amount of fluid needed for the operation of the hydraulic circuit 20 may advantageously range from 0.5 to 2 liters, preferably from 0.7 to 1.4 liters.
- the hydraulic circuit 20 is closed, it is also possible to contain its size: the overall length of the hydraulic line in which the fluid circulates is advantageously from 0.5 to 1.5 meters, preferably from 0.7 to 1 meter.
- a feedback control circuit 30 is included, comprising the electric motor 9 a connected to pump 9 by means of a connector 9 b.
- the control circuit 30 further comprises a pressure sensor 25 , located in the first branch 20 a of the hydraulic circuit 20 , between the actuator 21 and the maximum pressure valve 29 , and a position sensor 24 in the actuator 21 .
- the pressure sensor 25 allows to measure the pressure in the circuit, and in particular in the chamber 21 a, and thus to determine the force F 1 transmitted by the actuator 21 to the first roll 2 through the stem 31 . Force F 1 is transmitted from the first roll to the wire rod 10 .
- an equal opposite force F 2 transmitted from the second roll 3 to the wire rod 10 corresponds to force F 1 .
- the rolling force and pressure can be controlled by controlling the pressure in the hydraulic circuit 20 .
- the position sensor 24 allows to measure the movement of piston 22 , and thus to determine the movement of the first roll 2 .
- the position of the first roll 2 can be controlled by controlling the position of piston 22 , therefore by means of the transmission 11 , the position of the second roll 3 can also be controlled, thus adjusting the width of the passage gap 5 .
- the control circuit 30 further comprises a control unit 26 by means of which the electric motor 9 a is controlled.
- the control unit 26 is connected to the position sensor 24 and to the pressure sensor 25 , so to obtain a feedback control.
- the control unit 26 receives pressure and position data measured by the sensors 25 , 24 and processes them to determine the force F 1 and width values of the passage gap 5 .
- the control unit 26 then compares these values to respective reference values and therefore controls the electric motor 9 a to either modify or keep the force F 1 and the width of the passage gap 5 , according to an operation method 100 , the significant steps of which are described below.
- a constructional variant of a pinch roll device for a wire rod differs from device 1 in that it comprises a different hydraulic circuit 41 , as described in greater detail below.
- Other components of device 40 are not described in detail because they are identical to the above-described respective components of device 1 .
- the hydraulic circuit 41 differs from the hydraulic circuit 20 of device 1 in that it comprises a pair of single-effect, hydraulic actuators 42 , 43 connected to the first roll 2 and to the second roll 3 , respectively, instead of the double-effect, hydraulic actuator 21 .
- Each of the hydraulic actuators 42 , 43 comprises a piston 22 sliding between a respective upper first chamber 42 a, 43 a and a respective lower chamber 42 b, 43 b.
- the upper chambers 42 a, 43 a of the hydraulic actuators 42 , 43 are connected to the first and second branches 20 a, b of the hydraulic circuit 41 , respectively.
- the lower chambers 42 b, 43 b of the hydraulic actuators 42 , 43 are connected to each other by means of a hydraulic connection consisting of a compensation circuit 44 , by means of which the first and second rolls 2 , 3 are interconnected so that when the first roll 2 is moved from and to said second roll 3 , the latter is simultaneously moved from and to the first roll 2 .
- the first roll 2 and the second roll 3 are also either symmetrically spaced apart or approached with respect to the crossing axis X.
- the operation method 100 of device 1 which may be implemented in the control unit 26 , comprises an initial step 50 in which the method checks whether the rolls 2 , 3 are stationary with respect to the respective rotation axes Y 1 , Y 2 , or are rotating. If the rolls 2 , 3 are stationary, the method 100 ends going to a next stopping step 51 . If the rolls 2 , 3 are rotating by means of the pair of toothed wheels 2 a , 3 a, the method 100 continues with a next step 52 in which it checks whether the control motor 9 a of pump 9 is off or running. If the motor 9 a is off, the method 100 ends and goes to the stopping step 51 .
- the method 100 continues with a next step of setting the reference values 53 , in which the type and features of the product being machined, e.g. the wire rod 10 , are identified and a first reference value 61 of the position of piston 22 and a second reference value 71 of the pressure in the circuit 20 are set as a function of the identified product.
- the type and features of the product being machined e.g. the wire rod 10
- a first reference value 61 of the position of piston 22 and a second reference value 71 of the pressure in the circuit 20 are set as a function of the identified product.
- the method 100 continues with a next step 54 of checking the presence or absence of the metallurgic product to be machined, e.g. the wire rod 10 , in the passage gap 5 between the rolls 2 , 3 .
- the control unit 26 receives an external datum which identifies the presence or absence of the metallurgic product to be machined, obtained by means of one or more sensors (not shown), e.g. photocells, arranged upstream of the passage gap 5 and connected to the control unit 26 .
- the method 100 continues with a step 110 of checking the position of piston 22 and thus of the first roll 2 .
- the method 100 continues with a pressure checking step 120 , in which the pressure within actuator 21 is checked.
- the method 100 includes the step 80 of checking the end of machining, in which it checks, by means of a signal supplied by the control unit 26 , e.g. by means of a switch or other type of control actuatable by an operator, whether the machining process is underway or has ended. If the rolling process has ended, the method 100 ends with a final step 81 in which the first and second rolls 2 , 3 are taken to the maximum reciprocal distance. Alternatively, if the rolling process has not ended, the method 100 continues by repeating step 53 of setting the reference values.
- the position checking step 110 comprises a first sub-step 60 of determining, by means of the measurement supplied by the position sensor 24 , a measured value of the current position of piston 22 , which can be associated with the position of the first roll 2 due to the connection by means of stem 31 .
- a second position comparing sub-step 62 follows the first sub-step in order to compare the measured value of the position identified by the first sub-step 60 with the reference position value 61 . The comparison is carried out by subtracting the measured value from the reference value.
- the position checking step 110 continues with a third checking sub-step 64 , in which the method checks whether the subtraction carried out during the second sub-step 62 has a zero result or a result different from zero.
- the position checking step 110 ends and the method 100 continues with the machining-end checking step 80 , while if the result if other than zero, the position checking step 110 continues with a fourth sub-step 63 , in which a movement is imposed by means of the motor 9 a and the reversible pump 9 on the piston 22 to reach the position corresponding to the reference value 61 .
- the movement imposed on the piston 22 is proportional to the difference between the measured position value and the reference position value 61 .
- the position checking step 110 ends and the method 100 continues with the machining-end checking step 80 .
- the pressure checking step 120 comprises a fifth fast approaching sub-step 59 , in which the rolls 2 , 3 are approached to the metallurgic product to be machined, which is followed by a sixth sub-step 70 of determining a measured value of the pressure in the first branch 20 a of the hydraulic circuit 20 , upstream of the reversible pump 9 , by means of the measurement supplied by the pressure sensor 25 , which pressure value can be associated with the pressure of the first chamber 21 a of actuator 21 due to the proximity of the pressure sensor 25 to the actuator 21 .
- a seventh pressure comparing sub-step 72 follows the sixth sub-step to compare the measured pressure value identified in the sixth sub-step 70 with the reference position value 71 . The comparison is carried out by subtracting the measured value from the reference value.
- the pressure checking step 120 continues with a eighth checking sub-step 75 , in which the method checks whether the result of the subtraction carried out in the seventh sub-step 72 is zero or different from zero. If the result is zero, the pressure checking step 120 proceeds with a ninth sub-step 74 of refreshing the reference position, in which the first reference value 61 of the position of piston 22 is updated to the current value. At the end of the ninth sub-step 74 , the pressure checking step 120 is carried out, and the method 100 continues with the machining-end checking step 80 .
- the pressure checking step 120 proceeds with a tenth sub-step 73 , in which a movement is imposed by means of the motor 9 a and the reversible pump 9 on the piston 22 to reach the pressure corresponding to the reference value 71 .
- the movement imposed on the piston 22 is proportional to the difference between the measured pressure value and the reference pressure value 71 .
- the pressure checking step 120 ends and the method 100 continues with the machining-end checking step 80 .
- the above-described method in which the force checking step 110 and the position checking step 120 are carried out alternatively to each other, may be carried out very rapidly, at a frequency typically of the order of 3000 Hz. This results in the possibility of reaching feeding speeds along the crossing axis X for the products to be machined of the order of 150 m/s.
- the above-described method 100 may be also used in pinch roll devices other than device 1 , provided that they comprise:
Abstract
A pinch roll device (1) for rolled metallurgic products comprises:—a first pinch roll and a second pinch roll (2, 3), a passage gap (5) being defined therebetween, the first and second rolls (2, 3) being rotable about a first rotation axis and a second rotation axis (Y1, Y2), respectively, to draw a rolled metallurgic product (10) through the gap (5),—a hydraulic actuator (21, 41) comprising a hydraulic actuator (21, 42, 43) connected to the first roll (2) and/or the second roll (3) to reciprocally either approach or space apart the first and second rolls (2, 3), so as to either reduce or increase the width of the passage gap (5), respectively,—a pressure sensor (25) in the hydraulic circuit (20),—a position sensor (24) in the actuator (21),—a reversible pump (9) in the hydraulic circuit (20, 41) connected to the actuator (21, 42, 43) to slidingly move a piston (22) connected to the first roll (2) and/or to the second roll (3).
Description
- The present application claims priority to PCT International Application No. PCT/IB2012/053464 filed on Jul. 6 2012, which application claims priority to Italian Patent Application No. MI2011A001274 filed Jul. 8, 2011.
- Not Applicable.
- 1. Field of the Invention
- The present invention relates to a pinch roll device for rolled metallurgic products.
- 2. State of the Art
- In the technical field of line processes for semi-finished metallurgic products, e.g. wire rods, it is known to use pinch roll devices comprising systems for monitoring both the distance between the rolls and the pressure exerted by the rolls on the product when rolling.
- Among the devices of the aforesaid type, the one described in Patent U.S. Pat. No. 6,920,772 is known, for example, in which the rolls are connected to two cranks, respectively, connected to a single electric ratio motor. The controlled rotation of the ratio motor controls, by means of the two cranks, the reciprocal approach of the two rolls in one direction and the moving apart in the opposite direction. When a product being machined is present between the rolls, the ratio motor by means of the two cranks allows to adjust the thrust force of each roll against the other roll, thus also adjusting the pressure exerted by the rolls on the product being rolled.
- The device described in U.S. Pat. No. 6,920,772 has a series of drawbacks, caused by its constructional complexity and the inevitable presence of backlash in the transmission chain between the servo motor and the rolls, determined by the type and number of the mechanical members chosen to connect the servo motor to the rolls. Therefore, such a device does not allow to effectively control the distance between the rolls both during the waiting step, i.e. when the product to be rolled is not present between the rolls, and during the working step, when the product to be rolled is in contact with the rolls. During the working step, in devices as the one described in U.S. Pat. No. 6,920,772, in which the distance between the rolls is adjusted only by means of a kinematic chain comprising electromechanical members, the dynamic stresses caused by the contact between product and rolls determine the juddering of the rolls, and the consequent intermittent loss of contact between rolls and rolled product. The impossibility of ensuring a constant pinching action implies the instability of the device which is also transmitted upstream of the rolling line. Furthermore, the juddering of the pinch rolls causes a surface fault of the rolled product which reduces quality and increases material rejects.
- Other pinch roll devices, as those described in US2003/034376 and in EP019298 are also known, which allow the distance between the rolls to be controlled by means of hydraulic actuators comprising one or more hydraulic cylinders controlled by servo valves. In this field, the use of hydraulic circuits comprising servo valves determines a plurality of drawbacks, the main drawbacks being:
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- low operating speed of the servo valve (of the order of 40-50 Hz), with consequent low reactivity of the hydraulic circuit;
- open circuit operation with consequent need to provide external hydraulic attachments;
- high running and maintenance costs because the servo valves normally have low life cycles.
- The devices described in US2003/034376 and in EP0192982 are also improvable with regards to roll positioning accuracy.
- It is the object of the present invention to provide a new pinch roll device for rolled metallurgic products which allows to solve the mentioned drawbacks of the prior art, thus allowing to accurately control both the reciprocal distance of the pinch rolls and the pressure exerted by the rolls on the product when rolling, in order to ensure a continuous, even contact between rolls and rolled product.
- Another object is to make available a new pinch roll device for rolled metallurgic products which is completely automatic and which does not require any manual intervention by the operator, e.g. for compensating roll wear.
- A further object is to allow a high through speed, up to 150 m/s, of the product between the rolls to be achieved.
- Another object of the present invention is to make available a pinch roll device controlled by a hydraulic circuit having size, in terms of length of the hydraulic line and amount of operating fluid, much smaller than the prior art.
- A further object is to make available an operation method for the above-mentioned pinch roll device.
- In accordance with the invention, the aforesaid technical problem is solved by means of a pinch roll device having the features set forth in
independent claim 1, and by means of a method having the features set forth inindependent claim 8. - In particular, in a first aspect, the invention relates to a pinch roll device for rolled metallurgic products comprising:
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- a first pinch roll and a second pinch roll, a passage gap for a rolled metallurgic product being defined therebetween, said first and second rolls being rotatable about first and second rotation axes, respectively, to draw said metallurgic product through said gap by friction,
- a hydraulic circuit acting on said first and second rolls to reciprocally either approach or space apart said first and second rolls so as to either reduce or increase the width of said passage gap, respectively, said hydraulic circuit comprising one hydraulic actuator connected to said first roll and/or to said second roll to either reciprocally approach or space apart said first and second rolls,
characterized in that it further comprises: - a pressure sensor in said hydraulic circuit for determining the force transmitted by said actuator to said first roll,
- a position sensor in said actuator for determining the movement of said first roll,
- a reversible pump in said hydraulic circuit, said pump being connected to said actuator to slidingly move a piston of said actuator, said piston being connected to said first roll and/or to said second roll.
- With such an invention, due to the presence of the pressure and position sensors, a pinch roll device can be obtained, in which both the distance between the rolls and the thrust on the rolls when rolling are controlled in an optimized manner thus ensuring a continuous, even contact between rolls and rolled product.
- In a second aspect, the invention relates to an operation method of a pinch roll device for rolled metallurgic products, said device comprising:
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- a first pinch roll and a second pinch roll, a passage gap for a rolled metallurgic product being defined therebetween, said first and second rolls being rotatable about first and second rotation axes, respectively, to draw said metallurgic product through said gap by friction,
- a hydraulic actuator connected to said first roll to reciprocally either approach or space apart said first roll from said second roll so as to either reduce or increase the width of said passage gap, respectively,
- a reversible pump in said hydraulic circuit, said pump being connected to said actuator to slidingly move a piston of said actuator, said piston being connected to said first roll and/or to said second roll,
- said method comprising:
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- a step of checking either the presence or absence of said metallurgic product in said passage gap,
- a step of checking the position of said first roll, operated when the absence of said metallurgic product in said passage gap is identified in said step of checking,
- a step of checking the pressure of said hydraulic actuator, operated when the presence of said metallurgic product in said passage gap is identified, said step of checking the pressure comprising a sub-step of refreshing said position reference value.
- Similarly as described above with regards to the first aspect, the present invention allows to obtain a method of operating a pinch roil device for metallurgic products with an optimized control comprising a step of checking the position, which allows to set the distance between the rolls before the passage of the product, and a step of checking the pressure, which allows to adjust the roll thrust when rolling. The two steps are carried out alternatively with respect to each other, allowing to optimize the control cycle which thus may be carried out rapidly, thus favoring an increase of the through speed of the product between rolls.
- Other advantages of the present invention are achieved by means of a pinch roll device in accordance with the dependent claims, as explained in greater detail in the description that follows.
- Including a first roll and a second roll reciprocally interconnected by means of a mechanical and/or hydraulic connection allows to reciprocally approach or space apart the two rolls in a symmetric manner with respect to the crossing axis, so as to accurately and effectively control the size of the passage gap. In particular, the hydraulic actuator being directly active on only one of the two rolls, while the other is controlled by a geared transmission between the two rolls allows to synchronize the movement due to the direct coupling of the first and second rolls, in a simpler manner than the other known solutions, e.g. the one in U.S. Pat. No. 6,920,772, where a mechanical linkage transmission connects the operating member to both rolls. Alternatively, the use of two hydraulic actuators respectively acting on the two rolls and connected to each other by means of a compensation circuit allows to obtain the same operating accuracy and the same constructional simplicity.
- Using a hydraulic control circuit further allows to obtain a stabilization of the system by damping the stresses between rolls and rolled product operated by the hydraulic fluid.
- Furthermore, the hydraulic circuit being closed and pressurized allows to have very small size with respect to the typical hydraulic circuits which include a hydraulic unit.
- In the hydraulic circuit, using a reversible pump controlled by an electric motor, controlled in turn by a control unit connected to the position and pressure sensors, allows to implement a hydroelectric type control system in which the hydraulic part is used to control the reciprocal approach or spacing apart of the rolls, while the electric part allows to effectively obtain position and pressure feedback control. This allows to advantageously integrate the features of the hydraulic systems, in particular the possibility of exerting high pressures, with the features of the electric systems, in particular control speed and reliability. Using the reversible pump controlled by the electric motor allows to omit the servo valve normally used in hydraulic circuits and to additionally decrease the amount of fluid needed by the hydraulic circuit and the overall length thereof.
- Further features and advantages of the present invention will become more apparent in the following detailed description of a preferred embodiment, provided by way of non-exclusive, indicative non-limiting example, with reference to the accompanying drawings, in which:
-
FIG. 1 is a diagrammatic view of a pinch roll device for rolled metallurgical products in accordance with the present invention, -
FIG. 2 is a front view of some of the components of the device inFIG. 1 ; -
FIG. 3 is a side view of the components inFIG. 2 , -
FIG. 4 is a diagrammatic view of a constructional variant of the device inFIG. 1 , -
FIG. 5 is a block diagram of a method for operating a pinch roll device for rolled metallurgic products in accordance with the present invention. - With reference to accompanying
FIGS. 1-3 , a pinch roll device for a round-section, rolled metallurgic product is indicated byreference numeral 1 as a whole. - In general, a pinch roll device provided in accordance with the present invention may be appropriately configured to hold any rolled metallurgic product, e.g. a flat-section rolled product.
-
Device 1 comprises afirst pinch roll 2 and asecond pinch roll 3 which is identical to thefirst roll 3, between which a substantiallycircular passage gap 5 for awire rod 10 is defined.Gap 5 defines a crossing axis X, coaxial togap 5, with which thewire rod 10 is aligned in operation when passingpassage gap 5. - The first and
second rolls wire rod 10 through thepassage gap 5. The rotation axes Y1, Y2 are parallel to each other and equally spaced apart from the crossing axis X, with respect to which they are arranged on the opposite side. The shape and size ofgap 5 comply with those of thewire rod 10, andgap 5 is delimited by twoannular grooves second rolls second lever arm 8, respectively, so as to rotate about respective rotation axes Y1, Y2. The rotation of the pinch rolls 2, 3 about the respective axes Y1, Y2, integral with the first andsecond arms 7, 8, respectively, is obtained by means of a conventional and known actuator comprising a drive motor (not shown) connected to the rolls by means of a transmission comprising a pair of driventoothed wheels toothed wheels toothed wheels toothed drive wheels toothed drive wheel 3 b, by means of amotion output shaft 3 c. The motion is transmitted from the drivetoothed wheel 3 b to the other drivetoothed wheel 2 b and to the driventoothed wheel 3 a. The motion is transmitted from the drivetoothed wheel 2 b to the other driventoothed wheel 2 a. Due to the described coupling, the driventoothed wheels respective rolls - The first and
second arms 7, 8 are equal to each other and rotationally supported with respect to a fixed reference system integral with the crossing axis X by means of a pair of respective hinges which define a third rotation axis Z1 and a fourth rotation axis Z2, respectively, which are parallel to each other and equally spaced apart from crossing axis X, respect to which they are arranged on opposite side. - The first and
second arms 7, 8 can rotate about Z1 and Z2, respectively, to reciprocally either approach or space apart the first andsecond rolls passage gap 5, respectively. The third and fourth rotation axes Z1, Z2 are spaced apart along therespective arm 7, 8, from the first and the second rotation axes Y1, Y2, respectively, and parallel thereto. In practice, the four axes Y1, Y2, Z1 and Z2 form a parallel axis system in all operating conditions ofdevice 1. - In order to control the rotation of the
lever arms 7, 8 and therefore to reciprocally approach or space apart the first and thesecond rolls device 1 comprises ahydraulic circuit 20 in which a hydraulic fluid, e.g. oil, circulates and amechanical gear transmission 11, by means of which the first andsecond rolls - The
hydraulic circuit 20 is closed and pressurized, therefore no hydraulic control unit is required, and comprises ahydraulic actuator 21 connected to thefirst roll 2 to approach it to or space it apart from thesecond roll 3. Theactuator 21 comprises astem 31 hinged at afree end 31 a thereof to the first lever arm 7, close to thefirst roll 2. The translation ofstem 31 determines a corresponding rotation of the lever arm 7 about the third rotation axis Z1. The same rotation is transmitted to thesecond arm 8 by means oftransmission 11. - The
transmission 11, which thus allows thehydraulic actuator 21 to be connected to thesecond roll 3, by means of thefirst roll 2, comprises thelever arms 7, 8 and agear 12 between the first lever arm 7 and thesecond lever arm 8.Gear 12 comprises a firsttoothed sector 12 a and a secondtoothed sector 12 b integral with the first andsecond arms 7, 8, respectively, and meshing with each other so that each rotation imparted by theactuator 21 to the first arm 7 is transmitted to thesecond arm 8. - The first and second
toothed sectors 12 a,b are provided at the end of athird arm 32 and of afourth arm 33, respectively, being integral with the first andsecond arms 7, 8, aligned with each other and orthogonal to crossing axis X. Thearms toothed sectors 12 a, b mesh with each other at the same crossing axis X. The transmission ratio of thegear 12 is unitary so that each rotation of the first arm 7 corresponds to an equal, opposite rotation of thesecond arm 8.Gear 12 allows to obtain a synchronous, coordinated movement of the first andsecond lever arms 7, 8 and of therolls first roll 2 restrained thereto is equal and symmetric, with respect to axis X, to the assembly of thesecond arm 8 and thesecond roll 3 restrained thereto in all operating conditions. - According to another constructional variant of the invention (not shown), the first and
second rolls - The
hydraulic actuator 21 is of the double-effect type, comprising afirst chamber 21 a and asecond chamber 21 b, with apiston 22 connected to stem 31 and to asecondary stem 31 b sliding therebetween and being also opposed to stem 31 and having an equal diameter. In order to control the movement ofpiston 22, thehydraulic circuit 20 comprises areversible pump 9, connected to the first andsecond chambers 21 a, b of the actuator by means of afirst branch 20 a and asecond branch 20 b of thehydraulic circuit 20, respectively. The rotation of thereversible pump 9 in one direction or in the other allows to send oil directly to either one or the other of thechambers 21 a, b ofactuator 21, respectively, thus determining the movement ofpiston 22 and stem 31 in either one direction or in the opposite direction. -
Pump 9 which controls the movement ofpiston 22 is operated by anelectric motor 9 a; the position ofpiston 22 inside the cylinder thus depends on the angular position of themotor 9 a ofpump 9, while the movement speed of the cylinder depends on the angular speed ofpump 9. - As the
hydraulic circuit 20 is closed and pressurized, i.e. free from hydraulic control unit, the same amount of fluid always circulates therein. Themotor 9 a ofpump 9 determines each fluid movement in the hydraulic circuit 20: therefore, ifmotor 9 a does not operate thepump 9, the fluid flow in each point of thehydraulic circuit 20 is substantially zero and thepiston 22 does not move. - A connection branch is provided between the
first branch 20 a and thesecond branch 20 b of thehydraulic circuit 20, being equipped with amaximum pressure valve 29 calibrated so as to protect the hydraulic circuit from pressure overloads resulting from excessive, even pulsing loads applied to thefirst roll 2 and transmitted to theactuator 2 throughstem 31. The first andsecond branches 20 a, b are connected upstream of thereversible pump 9 to a top-upsource 27, which allows to top-up any leakage of fluid from thehydraulic circuit 20. Afirst check valve 28 a and asecond check valve 28 b, oriented so as to prevent the flow from thepump 9 to the top-upsource 27 and to allow the flow in the opposite direction, are provided between the top-upsource 27 and thereversible pump 9 on the first andsecond branches 20 a, b, respectively. - The amount of fluid needed for the operation of the
hydraulic circuit 20, given by the sum of the circulating fluid and the fluid present in the top-upsource 27, may advantageously range from 0.5 to 2 liters, preferably from 0.7 to 1.4 liters. As thehydraulic circuit 20 is closed, it is also possible to contain its size: the overall length of the hydraulic line in which the fluid circulates is advantageously from 0.5 to 1.5 meters, preferably from 0.7 to 1 meter. - The
reversible pump 9 and thus theactuator 21 are actuated in a controlled manner. Afeedback control circuit 30 is included, comprising theelectric motor 9 a connected to pump 9 by means of aconnector 9 b. Thecontrol circuit 30 further comprises apressure sensor 25, located in thefirst branch 20 a of thehydraulic circuit 20, between the actuator 21 and themaximum pressure valve 29, and aposition sensor 24 in theactuator 21. Thepressure sensor 25 allows to measure the pressure in the circuit, and in particular in thechamber 21 a, and thus to determine the force F1 transmitted by theactuator 21 to thefirst roll 2 through thestem 31. Force F1 is transmitted from the first roll to thewire rod 10. In order to achieve the device balance, obtained through the connection between thearms 7, 8 by means oftransmission 11, an equal opposite force F2 transmitted from thesecond roll 3 to thewire rod 10 corresponds to force F1. The rolling force and pressure can be controlled by controlling the pressure in thehydraulic circuit 20. Theposition sensor 24 allows to measure the movement ofpiston 22, and thus to determine the movement of thefirst roll 2. The position of thefirst roll 2 can be controlled by controlling the position ofpiston 22, therefore by means of thetransmission 11, the position of thesecond roll 3 can also be controlled, thus adjusting the width of thepassage gap 5. Thecontrol circuit 30 further comprises acontrol unit 26 by means of which theelectric motor 9 a is controlled. Thecontrol unit 26 is connected to theposition sensor 24 and to thepressure sensor 25, so to obtain a feedback control. Thecontrol unit 26 receives pressure and position data measured by thesensors passage gap 5. Thecontrol unit 26 then compares these values to respective reference values and therefore controls theelectric motor 9 a to either modify or keep the force F1 and the width of thepassage gap 5, according to anoperation method 100, the significant steps of which are described below. - With reference to
FIG. 4 , a constructional variant of a pinch roll device for a wire rod, indicated byreference numeral 40 as a whole, differs fromdevice 1 in that it comprises a differenthydraulic circuit 41, as described in greater detail below. Other components ofdevice 40 are not described in detail because they are identical to the above-described respective components ofdevice 1. Thehydraulic circuit 41 differs from thehydraulic circuit 20 ofdevice 1 in that it comprises a pair of single-effect,hydraulic actuators first roll 2 and to thesecond roll 3, respectively, instead of the double-effect,hydraulic actuator 21. Each of thehydraulic actuators piston 22 sliding between a respective upperfirst chamber lower chamber upper chambers hydraulic actuators second branches 20 a, b of thehydraulic circuit 41, respectively. Thelower chambers hydraulic actuators compensation circuit 44, by means of which the first andsecond rolls first roll 2 is moved from and to saidsecond roll 3, the latter is simultaneously moved from and to thefirst roll 2. As in the variant inFIG. 3 , in the variant inFIG. 4 , thefirst roll 2 and thesecond roll 3 are also either symmetrically spaced apart or approached with respect to the crossing axis X. When thereversible pump 9 sends oil directly to theupper chamber 42 a ofactuator 42 by means of thefirst branch 20 a, therespective piston 22 moves towards thelower chamber 42 b, while simultaneously pushing the oil through thecompensation circuit 44, into thelower chamber 43 b ofactuator 43, therespective piston 22 of which moves towards the respectiveupper chamber 43 a. Alternatively, when thereversible pump 9 sends oil directly to theupper chamber 43 a ofactuator 43 by means of thesecond branch 20 b, therespective piston 22 moves towards thelower chamber 43 b, while simultaneously pushing the oil through thecompensation circuit 44, into thelower chamber 42 b ofactuator 42, in which therespective piston 22 moves towards the respectiveupper chamber 42 a. - According to a further constructional variant of the invention (not shown), a pinch roll device according to the present invention comprises a hydraulic circuit similar to
circuit 41 but not including thetransmission 11. - With reference to the diagram in
FIG. 5 , theoperation method 100 ofdevice 1, which may be implemented in thecontrol unit 26, comprises aninitial step 50 in which the method checks whether therolls rolls method 100 ends going to a next stoppingstep 51. If therolls toothed wheels method 100 continues with anext step 52 in which it checks whether thecontrol motor 9 a ofpump 9 is off or running. If themotor 9 a is off, themethod 100 ends and goes to the stoppingstep 51. If themotor 9 a is running, themethod 100 continues with a next step of setting the reference values 53, in which the type and features of the product being machined, e.g. thewire rod 10, are identified and afirst reference value 61 of the position ofpiston 22 and asecond reference value 71 of the pressure in thecircuit 20 are set as a function of the identified product. - The
method 100 continues with anext step 54 of checking the presence or absence of the metallurgic product to be machined, e.g. thewire rod 10, in thepassage gap 5 between therolls step 54, thecontrol unit 26 receives an external datum which identifies the presence or absence of the metallurgic product to be machined, obtained by means of one or more sensors (not shown), e.g. photocells, arranged upstream of thepassage gap 5 and connected to thecontrol unit 26. - When the absence of the metallurgic product to be machined in the
passage gap 5 is identified during the checkingstep 54, themethod 100 continues with astep 110 of checking the position ofpiston 22 and thus of thefirst roll 2. Alternatively, when the presence of metallurgic product to be machined is identified in thepassage gap 5 in the checkingstep 54, themethod 100 continues with apressure checking step 120, in which the pressure withinactuator 21 is checked. - At the end of either the
position checking step 110 and thepressure checking step 120, themethod 100 includes thestep 80 of checking the end of machining, in which it checks, by means of a signal supplied by thecontrol unit 26, e.g. by means of a switch or other type of control actuatable by an operator, whether the machining process is underway or has ended. If the rolling process has ended, themethod 100 ends with afinal step 81 in which the first andsecond rolls method 100 continues by repeatingstep 53 of setting the reference values. - If the
position checking step 110 comprises afirst sub-step 60 of determining, by means of the measurement supplied by theposition sensor 24, a measured value of the current position ofpiston 22, which can be associated with the position of thefirst roll 2 due to the connection by means ofstem 31. A secondposition comparing sub-step 62 follows the first sub-step in order to compare the measured value of the position identified by the first sub-step 60 with thereference position value 61. The comparison is carried out by subtracting the measured value from the reference value. Theposition checking step 110 continues with athird checking sub-step 64, in which the method checks whether the subtraction carried out during the second sub-step 62 has a zero result or a result different from zero. If the result is zero, theposition checking step 110 ends and themethod 100 continues with the machining-end checking step 80, while if the result if other than zero, theposition checking step 110 continues with a fourth sub-step 63, in which a movement is imposed by means of themotor 9 a and thereversible pump 9 on thepiston 22 to reach the position corresponding to thereference value 61. The movement imposed on thepiston 22 is proportional to the difference between the measured position value and thereference position value 61. At the end of the fourth sub-step 63, theposition checking step 110 ends and themethod 100 continues with the machining-end checking step 80. - The
pressure checking step 120 comprises a fifth fast approachingsub-step 59, in which therolls sixth sub-step 70 of determining a measured value of the pressure in thefirst branch 20 a of thehydraulic circuit 20, upstream of thereversible pump 9, by means of the measurement supplied by thepressure sensor 25, which pressure value can be associated with the pressure of thefirst chamber 21 a ofactuator 21 due to the proximity of thepressure sensor 25 to theactuator 21. A seventhpressure comparing sub-step 72 follows the sixth sub-step to compare the measured pressure value identified in the sixth sub-step 70 with thereference position value 71. The comparison is carried out by subtracting the measured value from the reference value. Thepressure checking step 120 continues with a eighth checkingsub-step 75, in which the method checks whether the result of the subtraction carried out in the seventh sub-step 72 is zero or different from zero. If the result is zero, thepressure checking step 120 proceeds with aninth sub-step 74 of refreshing the reference position, in which thefirst reference value 61 of the position ofpiston 22 is updated to the current value. At the end of the ninth sub-step 74, thepressure checking step 120 is carried out, and themethod 100 continues with the machining-end checking step 80. If the result of the subtraction calculated in the eighth checkingsub-step 75 is not zero, but other than zero, thepressure checking step 120 proceeds with a tenth sub-step 73, in which a movement is imposed by means of themotor 9 a and thereversible pump 9 on thepiston 22 to reach the pressure corresponding to thereference value 71. The movement imposed on thepiston 22 is proportional to the difference between the measured pressure value and thereference pressure value 71. At the end of the tenth sub-step 73, thepressure checking step 120 ends and themethod 100 continues with the machining-end checking step 80. - The above-described method, in which the
force checking step 110 and theposition checking step 120 are carried out alternatively to each other, may be carried out very rapidly, at a frequency typically of the order of 3000 Hz. This results in the possibility of reaching feeding speeds along the crossing axis X for the products to be machined of the order of 150 m/s. - The above-described
method 100 may be also used in pinch roll devices other thandevice 1, provided that they comprise: -
- a first pinch roll and a second pinch roll, a passage gap for a rolled metallurgic product being defined therebetween, which are rotatable about a first rotation axis Y1 and second rotation axis Y2, respectively, to draw by friction said metallurgic product through the passage gap,
- a hydraulic actuator connected to the rolls to approach them or space them apart in a controlled manner, so as to reduce or increase the width of the passage gap, respectively,
- a reversible pump connected to the hydraulic actuator to slidingly move the piston connected to the first and/or second pinch roll.
- The described technical solutions allow to fully solve the set task and objects with reference to the mentioned prior art, thus obtaining a plurality of further advantages, including:
-
- using a high-efficiency, closed hydraulic circuit in which only a minimum amount of fluid is moved, i.e. only that needed for moving the piston of the hydraulic actuator. This allows to obtain a hydraulic circuit characterized by high reactivity. This is further encouraged by the use of a hydraulic pump controlled by an electric motor which allows to reach operating speeds (up to 200-300 Hz), which are significantly higher than those which can be achieved by means of servo valves;
- obtaining a device which is not affected by the inevitable wear of the pinch rolls, which may be compensated by the rotation of the lever arms which support the rolls;
- providing a self-damping system, in which the damping function is performed by the fluid in the hydraulic control circuit and which thus does not require the insertion of additional damping elements;
- using a hydraulic system free from servo valves thus allowing to significantly reduce running and maintenance costs.
Claims (23)
1. (canceled)
2. (canceled)
3. (canceled)
4. (canceled)
5. (canceled)
6. (canceled)
7. (canceled)
8. (canceled)
9. (canceled)
10. (canceled)
11. (canceled)
12. A pinch roll device for rolled metallurgic products, comprising:
as first pinch roll and as second pinch roll, between which a passage gap for a rolled metallurgic product is defined, said first and second rolls being rotatable about first and second rotation axes, respectively, to draw by friction said metallurgic product through said gap,
a hydraulic closed circuit acting on said first and second rolls to reciprocally either approach or space apart said first and second rolls so as to either reduce or increase the width of said passage gap, respectively, said hydraulic circuit comprising at least one hydraulic actuator connected to said first roll and/or to said second roll to either reciprocally approach or space apart said first and second rolls,
a pressure sensor in said hydraulic circuit to determine the force transmitted by said actuator to said first roll and/or to said second roll,
a position sensor in said actuator to determine the movement of said first roll and/or of said second roll,
a reversible pump in said hydraulic circuit, said pump being connected to as first chamber and a second chamber of said at least one hydraulic actuator to slidingly move a piston of said at least one hydraulic actuator, said piston being connected to said first roll and/or to said second roll, the rotation of said reversible pump in one direction or in the other allowing to send a fluid directly to either one or the other of said first and second chambers, respectively.
13. A pinch roll device according to claim 12 , wherein said first and second rolls are reciprocally interconnected by means of a mechanical and/or hydraulic connection.
14. A pinch roll device according to claim 13 , wherein said hydraulic circuit comprises a hydraulic actuator connected to said first roll and said connection comprises a geared transmission between said first and second rolls to connect said hydraulic actuator to said second roll, by means of said first roll.
15. A pinch roll device according to claim 13 , wherein said hydraulic circuit comprises a pair of hydraulic actuators connected to said first and second rolls, respectively, to move said first roll from and to said second roll while moving said second roll from and to said first roll, said connection comprising a compensation circuit between said first and second rolls.
16. A pinch roll device according to claim 14 , wherein said hydraulic circuit comprises a pair of hydraulic actuators connected to said first and second rolls, respectively, to move said first roll from and to said second roll while moving said second roll from and to said first roll, said connection comprising a compensation circuit between said first and second rolls.
17. A pinch roll device according to claim 14 , wherein said transmission comprises first and second lever arm, said first and second rolls being respectively restrained thereto, so as to rotate about respective rotation axes, said first and second arm being rotatable about a third rotation axis and a fourth rotation axis, respectively, to reciprocally either approach or space apart said first and second rolls, said gear comprising at least as first toothed sector and a second toothed sector, integral with said first and second arms, respectively, said first and second toothed sectors being meshed with each other to transmit the rotation between said first and second levers.
18. A pinch roll device according to claim 17 , wherein said first, second, third and fourth rotation axes are parallel to one another.
19. A pinch roll device according to claim 12 , wherein said pump is controlled by an electric motor controlled means of a control unit connected to said position sensor and to said pressure sensor, the position of said piston depending on the angular position of said motor, the speed of said piston depending on the angular speed of said pump.
20. A method of operating a pinch roll device for rolled metallurgic products, said device comprising:
a first pinch roll and a second pinch roll, between which a passage gap for a rolled metallurgic product is defined, said first and second rolls being rotatable about first and second rotation axes, respectively, to draw by friction said metallurgic product through said gap,
at least one hydraulic actuator connected to said first roll and second roll to reciprocally either approach or space apart said rolls so as to either reduce or increase the width of said passage gap, respectively,
a reversible pump connected to a first chamber and a second chamber of said at least one hydraulic actuator to slidingly move a piston of said at least one hydraulic actuator, said piston being connected to said first roll and/or to said second roll,
said method comprising:
a step of checking either the presence or absence of said metallurgic product in said passage gap,
a step of checking the position of said first roll, implemented when the absence of said metallurgic product in said passage gap is identified in said checking step,
a step of checking the pressure of said hydraulic actuator, implemented when the presence of said metallurgic product in said passage gap is identified, said pressure checking step comprising a sub-step of refreshing said position reference value, said sub-step of refreshing said position reference value is operated when said measured pressure value is identified as equal to said pressure reference value in said pressure comparing, sub-step.
21. An operation method according to claim 20 , wherein said step of checking the position of said first roll comprises a position comparing sub-step to compare a measured position value, which may be associated with the position of said first roll, with a reference position value.
22. An operation method according to claim 20 , wherein said step of checking the pressure in said hydraulic actuator comprises a pressure comparing sub-step to compare a measured pressure value, which may be associated with said hydraulic actuator, with a reference pressure value.
23. An operation method according to claim 21 , wherein said step of checking the pressure in said hydraulic actuator comprises a pressure comparing sub-step to compare a measured pressure value, which may be associated with said hydraulic actuator, with a reference pressure value.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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ITMI2011A001274 | 2011-07-08 | ||
IT001274A ITMI20111274A1 (en) | 2011-07-08 | 2011-07-08 | DRIVING DEVICE FOR LAMINATED METALLURGICAL PRODUCTS |
PCT/IB2012/053464 WO2013008159A2 (en) | 2011-07-08 | 2012-07-06 | Pinch roll device for rolled metallurgic products |
Publications (1)
Publication Number | Publication Date |
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US20140137617A1 true US20140137617A1 (en) | 2014-05-22 |
Family
ID=44511227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/131,388 Abandoned US20140137617A1 (en) | 2011-07-08 | 2012-07-06 | Pinch roll device for rolled metallurgic products |
Country Status (7)
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US (1) | US20140137617A1 (en) |
EP (1) | EP2729263B9 (en) |
JP (1) | JP5806400B2 (en) |
KR (1) | KR20140032480A (en) |
CN (1) | CN103702776B (en) |
IT (1) | ITMI20111274A1 (en) |
WO (1) | WO2013008159A2 (en) |
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CN106807763B (en) * | 2015-11-27 | 2018-09-11 | 北京京诚瑞信长材工程技术有限公司 | A kind of pinch roller structural assembly |
CN106269924B (en) * | 2016-10-13 | 2019-02-19 | 北京京诚瑞信长材工程技术有限公司 | Pinch roller |
CN110052501B (en) * | 2019-04-15 | 2020-03-13 | 燕山大学 | Spring swinging box type under-actuated symmetrical clamping and conveying mechanism |
CN110883108B (en) * | 2019-11-19 | 2021-09-07 | 张家港宏昌钢板有限公司 | Spiral shell production and processing device with pinch roll |
CN111330982A (en) * | 2020-03-16 | 2020-06-26 | 哈尔滨哈飞工业有限责任公司 | Control system of pinch roll of high-speed wire rod production line |
CN112518017B (en) * | 2020-11-17 | 2023-09-12 | 中冶华天南京工程技术有限公司 | Intelligent adjusting system and adjusting method for pinch roll before shearing |
CN116037698B (en) * | 2023-02-07 | 2023-07-21 | 浙江菲尔特过滤科技股份有限公司 | Metal fiber processing equipment and processing method based on roll forging |
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Non-Patent Citations (1)
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Attached: Machine translation of detailed description of JP08052514A; Copy of original document JP08052514A from EAST database * |
Also Published As
Publication number | Publication date |
---|---|
CN103702776A (en) | 2014-04-02 |
EP2729263B1 (en) | 2015-11-18 |
WO2013008159A2 (en) | 2013-01-17 |
WO2013008159A3 (en) | 2013-03-14 |
JP2014521514A (en) | 2014-08-28 |
EP2729263A2 (en) | 2014-05-14 |
CN103702776B (en) | 2017-02-15 |
KR20140032480A (en) | 2014-03-14 |
EP2729263B9 (en) | 2016-04-13 |
ITMI20111274A1 (en) | 2013-01-09 |
JP5806400B2 (en) | 2015-11-10 |
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