JPS6368223A - Roller straightener - Google Patents

Abstract

PURPOSE:To accurately detect tensions and to straighten a sheet by preventing slips between each leveling roll and the sheet by providing separated shaft boxes supporting a leveling roller being independently driven with load meters measuring tensions respectively for a roller straightener. CONSTITUTION:Plural leveling rollers 1-1-1-n are installed sequentially and up and down prescribed spaces from the upstream side to the downstream side in the travel direction of a sheet P. The above leveling rollers are supported by shaft boxes 14-1-14-n respectively and form and upper and a lower roller group by installing backup rollers 2-1-2-n. The shaft boxes are provided with load meters 33-1-33-n respectively and tensions of the sheet P are measured by a series of the load meters. The roller straightener gives the sheet P tensions without slips between the leveling roller and the sheet P and improve the straightening effect for the sheet P.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an a-ra straightening machine for straightening a board with poor flatness to obtain a flat board.

[Prior Art] A roller straightening machine has conventionally been used to straighten a board with poor flatness to obtain a flat board.

A conventional roller straightening machine will be explained with reference to FIGS. 6 and 7. In the figures, a indicates a plurality of leveling rollers for straightening the plate material, b indicates a backup roller for backing up each leveling roller a, and C indicates each leveling roller a. d is a pinion stand for transmitting power to each universal shaft C, C is a reduction gear, r is an electric motor, and all leveling rollers a of the upper roller group and lower roller group can be driven by one electric motor r.

When straightening the flatness of a plate using the roller straightening machine mentioned above,
The upper roller group is raised and lowered by a rolling device (not shown) to adjust the gap between the upper and lower leveling rollers, and the upper roller group is adjusted so that the leveling roller gap on the upstream side becomes smaller and the leveling roller gap on the downstream side with respect to the plate traveling direction. (tilting), drive the electric motor f to drive the upper roller group and lower roller group, pass the plate material between the upper and lower leveling rollers a, and keep all leveling rollers a constant. The flatness of the plate material is corrected while being driven at high speed.

During flatness correction, the leveling roller gap is small on the upstream side and increases as it goes downstream, so the plate is bent to a small radius of curvature on the upstream side and bent to a large radius of curvature on the downstream side. Boarded. In addition, the traveling speed of the plate bent by the leveling roller a is that if the speed at the center in the plate thickness direction is the average speed, the speed on the inner circumferential side in the radial direction of the bent part of the plate is smaller than the average speed, and the degree to which it decreases is depends on the size of the radius of curvature mentioned above.

However, in the above-mentioned roller straightening machine, the circumferential speed of the leveling rollers is all the same, so as mentioned above, if the advancing speed of the inner circumference at the bent part of the plate depends on the size of the radius of curvature, the radius of curvature will be small. On the upstream side of , the leveling roller pushes the plate material, and on the downstream side of the large radius of curvature, the speed difference occurs at the contact area between the outer periphery of the leveling roller a and the plate material, and vice versa, in the direction that pushes the plate material or the leveling roller, and as a result,
Slippage occurs between the leveling roller a and the plate material, causing sliding scratches on the surface of the plate material, and torque circulation occurs in which the downstream cola acts as a brake.

Furthermore, in the above roller straightening machine, each of the upper and lower roller groups is driven by one electric motor r.
is capable of applying a straightening torque to all leveling rollers of the corresponding roller group. Therefore, if the reduction setting of leveling roller a is mistakenly set too high, when the plate reaches the second or third main leveling roller from the upstream side, a large torque equivalent to the straightening torque for all the rollers will be applied to the second or third main leveling roller from the upstream side. ~To concentrate on the three leveling rollers,
Accidents occur in which the universal shaft of these leveling rollers exceeds the permissible transmission torque and the universal shaft is frequently damaged.

Recently, we came up with a roller straightening machine that does not cause sliding scratches on the plate, does not apply a large torque equivalent to the total straightening torque to several leveling rollers, and does not cause torque circulation. It was done.

The basic principle of such a recently devised roller straightening machine will be explained with reference to FIGS. 8 to 10.

FIGS. 8 to 1O show the relationship between the advancing speed of a plate passing through the leveling rollers while undergoing plastic bending and the circumferential speed of the leveling rollers.

Now, among the n leveling rollers, leveling roller 1 from the entrance side to the i main entrance. The outer periphery and the plate material P contact at point X1,
It is assumed that the plate P is subjected to plastic bending with a radius of curvature ρi at the center in the thickness direction. The center point 01 of the leveling roller 11, the center point 02 of the radius of curvature ρ of the plate material P, and the point x1 are as follows:
They are on the same straight line 11. The velocity of the plate material P in the thickness direction on this straight line 11 is as shown in FIG.
Plate P at point X1 with a size proportional to the distance from
The advancing speed of the plate P at the intersection X2 of the straight line 11 and the outer circumferential side of the radius of curvature of the plate P is v×2, and the advancing speed (average speed) of the plate P at the center in the thickness direction is Vi Then, VXI <V;<VX2. Also, in order to prevent slipping between the leveling roller 1; and the plate material 2, if the circumferential speed of the leveling roller 1 is W;
Since there is a relationship of i-Vx, a relationship based on the geometrical relationship shown in FIG. 9 is obtained. However, h is leveling roller I
, is the thickness of the plate material P at the part that contacts with.

The stress occurring inside the plate P between points Xi and X2 is the 10th
The broken line 12 in the figure and the strain are indicated by the straight line 13. Now, there is a region inside the plate P that has not reached plastic strain and is under elastic strain.

The binding and correction effect rate α is defined as follows. Also, the elastic strain is ε. , if the plastic stress is σ, and the longitudinal elastic modulus of the plate is E, then there is a relationship such as
) and rearranging it, we get .

In the leveling roller of the i+1th main entrance, there is a relationship similar to that described above, and since the plate material P is a continuous body, Vi
Since it must be +mVi, , from equations (i) and (V), wi, -CHW; ...(D).

Here, Ci is the speed difference coefficient between the i wood grain and the i+1th zero leveling roller.

When the leveling roller is given an inclined reduction, the roller that gives the minimum radius of curvature to the plate material is the second to fourth roller from the entry side, depending on the total number of leveling rollers n, and this minimum radius of curvature is set as ρ. . Also, the radius of curvature ρ at the 0th leveling roller, that is, the final leveling roller. is generally close to infinity (
1/ρn→0). Applying this relationship and to simplify the explanation, assuming that the plate material P has a constant thickness over its entire length, that is, h - hi - hi, 1, the difference between the leveling roller and the final leveling roller that provides the minimum radius of curvature ρ is The speed difference coefficient C is as follows.

Table 1 shows the velocity difference coefficient C calculated using the G@ formula for general structural steel and high tensile strength steel.

Table 1 Between the leveling roller and the final leveling roller that gives the minimum curvature semi-axis ρ to the plate P, for general structural steel, 0.21
%, it is necessary to increase the peripheral speed of the final leveling roller by adding a speed difference of 2.44% with high tensile strength steel. Similarly, the peripheral speed of the other leveling rollers must be higher than the peripheral speed of the minimum radius of curvature ρ, and this situation is shown in FIG. However, in FIG. 11, the leveling roller that provides the minimum radius of curvature ρ is placed in the third position.

By the way, in order to prevent slippage between the leveling roller and the plate material, it is necessary to sequentially create a difference in peripheral speed between the leveling roller that provides the minimum radius of curvature ρ and the other leveling rollers, as described above. , each leveling roller may be driven by a separate electric motor. Further, with this type of drive, no overload is applied to the two or three leveling rollers, and no torque circulation occurs between the upstream and downstream leveling rollers. However, if an electric motor is provided for each leveling roller, the distance between the leveling rollers is small, but the outer diameter of the motor and the gear distance in the pinion stand are large. It becomes necessary to tilt it significantly against the angle. However, this angle of inclination has a limit and cannot be made too large. Therefore, the motor and the pinions and gears in the pinion stand must be adjusted so that the angle of inclination of any universal shaft is within the limit when viewed from above. It is necessary to devise the arrangement.

Next, a specific example of a recently devised roller straightening machine will be explained with reference to FIGS. 12 and 13. The upper and lower leveling rollers 1 are arranged at a predetermined interval from the upstream side to the downstream side in the direction of movement of the plate material P. , each leveling roller 1 is supported by a backup roller 2, with the leveling roller and backup roller above the plate 4.4P pass line forming an upper roller group, and the leveling roller and backup roller below the plate material P pass line forming a lower roller group. is formed. Further, the upper roller group can be raised and lowered by a rolling down device, and can also be tilted in the temporary phase advancing direction by a tilting device.

A universal shaft 3 is connected to each leveling roller 1, and a pinion 6 fixed to an input shaft 5 and a pinion 6 fixed to an output shaft 7 are connected to a pinion stand 4, corresponding to the number of universal shafts 3. A meshing large-diameter gear 8 is housed, each output shaft 7 is connected to the universal shaft 3, and the input shaft 5 is connected to an electric motor 9.

Since adjacent gears 8 and electric motors 9 are arranged in a staggered manner when viewed from above, the spacing between adjacent gears 8 and electric motors 9 can be reduced, and as a result, the universal shaft on the most upstream or downstream side The planar inclination angle β of 3 is within the limit values. Further, the electric motor group for driving each leveling roller 1 of the upper roller group is located directly above the electric motor group for driving each leveling roller 1 of the lower roller group. In addition, the reduction ratio from the electric motor 9 to the leveling roller 1 is determined so that when each electric motor is operated with the same voltage and current value, the circumferential speed of the corresponding leveling roller is the same, and the necessary difference in circumferential speed is is obtained by adjusting the voltage value or current value so as to satisfy the &D formula.

When straightening the plate material P, the gap between the upper and lower leveling rollers 1 is adjusted, and the upper roller group is tilted so that the gap becomes larger toward the downstream side, and the plate 44 P is passed through to correct the flatness. . At this time, the circumferential speed of the contact portion of the leveling roller l with the plate material P is synchronized with the advancing speed of the contact surface of the plate material P with respect to the leveling roller 1 (as determined by formula D, the peripheral speed of the contact portion of the plate material P and the leveling roller l There is no slippage between the rollers, and therefore no scratches are caused to the surface of the plate material 2.Also, since each leveling roller 1 is driven independently, each electric motor has only the ability to drive the leveling roller. If excessive setting is encountered, the leveling roller 1 will stop, so the universal shaft 3 will not break.

Furthermore, since the electric motor 9 does not receive torque from the plate material P via the leveling roller 1 or the like, the electric motor 9 does not act as a brake and no torque circulation occurs.

By the way, when straightening a plate with a roller straightening machine, it is well known that applying a tensile force to the plate improves the straightening effect.

14 and 15 show a conventional roller straightening machine for thick plate equipped with a tension applying mechanism, and 30-lavender 9 is installed on the entrance side of the roller straightening machine shown in FIGS. 6 and 7. This is what was placed. In addition, q is a roller that bends the plate material p, j is a backup roller that backs up each roller q, k is a universal shaft for transmitting power to one of the three rollers q, and m is an electric motor. .

When straightening the plate p with the above device, the gap between the upper and lower rollers q and the upper and lower leveling rollers a, a
After adjusting the gap between
, Q and between the leveling rollers a and a, a plate p to be straightened is passed between the plate p and the plate p is pulled by an electric motor r, and the motor m is also made to act as a generator to cause the roller q to perform a braking action, Straightening is performed while applying tensile force to the plate material p.

Therefore, the leveling rollers that provide the strongest bending in the roller straightening machine are the second to fourth rollers from the upstream side, depending on the total number of rollers, and when applying tensile force to plate +4p, It is desirable to maximize the tensile force near that point.

However, in the conventional roller straightening machine shown in FIGS. 14 and 15, a tensile force F' is applied to the plate material p by an electric motor r for driving the leveling roller a and an electric motor m for driving the roller q of the 30-level pender 9. If the motor r is 1
For example, the tensile force F4' between the third and fourth leveling rollers aha is the same as that of the first to third leveling rollers on the upstream side.
The reducing force Fl, F2. Since it acts on F3, Fa'=F
' -Fl -F2 F3 and could not be made sufficiently large (see Figure 16).

Also, if you try to forcefully increase the tensile force Fa', you will have to increase the tensile force F1', and the amount of bending of the plate p at 30-Lavender 9 will have to increase.
This results in 30-lavender 9 being expensive.

Furthermore, in the roller straightening machine, each leveling roller a
Despite the fact that the circumferential speed of P must be changed according to a certain law so as to be synchronized with the feed speed of the plate P, this is not possible when driven by a single electric motor R. Therefore, each leveling roller a and the plate material p slip.

Furthermore, the tensile force applied to the plate p cannot exceed the product of the straightening force generated between the plate p and the leveling roller a and the coefficient of friction between them, and if slippage occurs between the two, the coefficient of friction becomes static friction. The coefficient decreased from the coefficient of dynamic friction to the coefficient of dynamic friction, and from this aspect as well, it was not possible to apply a sufficiently large tensile force.

Recently, in view of the above-mentioned circumstances, a roller straightening machine has been devised that can apply the largest tensile force near the leveling rollers at the second to fourth openings.

17 and 18 show an embodiment of such a recently devised roller straightening machine, in which a pinch roller device 10 is disposed upstream of the roller straightening machine shown in FIG. The upper and lower pinch rollers 11 of the IO are connected to an electric motor 13 via a universal shaft 12. In addition, the upper pinch roller 11 can be raised and lowered by a suitable lifting device, and the upper and lower pinch rollers 11 move the plate material P.
It is designed so that it can be held in place.

When straightening the plate material P using the above device, the gap between the upper and lower pinch rows 911, 11 and the gap between the upper and lower leveling rollers 1, 1 are adjusted, and the electric motor 13 moves the pinch roller 11 through the universal shaft 12. The leveling rollers 1 provided corresponding to the motors 9 are driven by individual electric motors 9 via the pinion stand 4 and the universal shaft 3, and the pinch rollers 11. between li and leveling roller 1,
During this time, the plate P to be straightened is passed through.

When each leveling roller 1 is driven, its speed is controlled to a circumferential speed that satisfies IyD and Equation 60, and is operated so that no slipping occurs between the leveling roller (2) and the plate material P.

Each leveling roller 1 of the roller straightening machine is divided into two groups, for example, a 10th-ra group consisting of the first and second leveling rollers 1 from the upstream side and a 20th-ra group thereafter, and the first The set speed of the second leveling roller 1 is set slightly slower than the 6tJ type as the second leveling roller 1 acts as a brake similar to the pinch roller 11, and the set speed of the third and subsequent leveling rollers 1 is set to 6. ), thereby applying an additional tensile force to the plate material P between the second and third leveling rollers 1.1. Since the additional tensile forces F1, F2, Fl... determined by the product of the straightening force of each leveling roller 1 and the coefficient of static friction act sequentially from the upstream side of each leveling roller 1, the pinch roller 11
By adding or subtracting from the tensile force F, the tensile force between each leveling roller 1°1 becomes as follows (see FIG. 19).

Between the pinch roller 11 and the first leveling roller 1;
F Between the first and second leveling rollers 1; F+F+ Between the second and third leveling rollers 1; F+F,
+F2 Between the 3rd and 4th leveling roller 1; F+F1
+F2-F3 Between n-1st and nth leveling row 91; F+
F+ +F2 F3...-F.

Therefore, among the leveling rollers 1, the maximum tensile force F+F1+F2 is obtained between the second and third leveling rollers, which are the boundaries between the 10th and 20th group. The straightening effect between the roller 1 and the third leveling roller 1 is significantly improved.

On the other hand, it has been considered to further improve the straightening effect by combining the recently devised roller straightening machine No. 12'J with the roller straightening machine shown in FIG. The following problems were found.

In other words, in the roller straightening machine shown in Fig. 12, in order to drive the leveling rollers at the i-th main entrance and the i+1-th main entrance without slipping, each individual electric motor must be It is sufficient to control the current value, and in a normal roller straightening machine, the plate thickness can be considered to be substantially constant over the entire length of the plate, so the equation O is satisfied.

As can be seen from the equation I (where h = h i -h in)00, the speed difference coefficient Ci is a function of the radius of curvature of the plate material. Currently, there is no way to industrially measure this radius of curvature, so a method of predicting it theoretically is being used.
Some error will occur, resulting in a current deviation of the motor.

On the other hand, in the roller straightening machine shown in Fig. 17, when applying additional tension to the plate material, the additional torque corresponding to the added tension is added to or subtracted from the torque required for the original plate material straightening to the leveling rollers, so the electric current of the motor ends up being The value is also added or subtracted according to the added tension.

It is impossible to separately measure this addition/subtraction current and the current deviation caused by the curvature radius prediction error, resulting in a decrease in the accuracy of tension control.

[Problems to be Solved by the Invention] As described above, when the tension control accuracy decreases, it causes slippage between the plate material and the rollers, and the individual roller straightening machines shown in FIGS. There are problems that defeat both objectives.

The present invention has been made in view of the above-mentioned circumstances and in order to utilize the features of a recently devised roller straightening machine.

[Means for Solving the Problems] The present invention divides the leveling rollers, each of which can be driven independently, into two groups of rollers, one on the upstream side and the other on the downstream side in the direction of movement of the plate, and further upstream of the upstream roller group. In a roller straightening machine that can apply tension to a plate material using a tension applying device installed at a certain position and the above-mentioned upstream roller group, a load meter for measuring tension is attached to a separate shaft box that supports each leveling roller. It has a configuration.

[Function] When each leveling roller applies bending and tension to the plate material at the same time, the energy and tension required for bending are applied from the rollers to the plate material through the friction between the rollers and the plate material, but the tension is approximately Since it acts horizontally, only the tension is detected by the load cell, and the energy and tension required for bending are separated.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, from the upstream side to the downstream side in the traveling direction of the plate material P, a leveling roller l-+,
L2...l-N are sequentially arranged one above the other at a predetermined interval and supported by shaft boxes 14-+ + 14-2...14°, and each leveling roller l-1
, 1-2...1-11 are backup rollers 2-1, 2-2...2 supported by bearings not shown.
-s, forming an upper roller group and a lower roller group. Also, each leveling roller 1-1t 1
-2...1-a (here, the pinions 3 are connected through universals, and the pinion stand 4 has a pinion 6 connected to the human-powered tfII 5, and both pinions connected to the output shaft 7, corresponding to the number of universal shafts. A large-diameter gear 8 which is connected to a pipe and meshes with the pinion 6 is housed therein, the universal shaft 3 is connected to each output shaft 7, and a single electric motor 9 is connected to each input t'd+5.

Each of the leveling rollers 1-1+L2...1-1
1 is an upper and lower frame 16.1 arranged in the housing 15.
7 respectively axle boxes 14-+, 14-2...14
-Holded through N. A liner 18 is provided on the upper part of the upper frame 16, and both ends of the liner 18 have a cylindrical surface with a central point A on a straight line connecting the axes of the upper leveling rollers l, l-3,... as a fulcrum. 18a, 18
a is formed, and the wheels 20.20 of the beam 19 arranged above the upper frame 16 abut against the cylindrical surfaces 18a, 18a. Further, a sect gear 21 is integrally provided at the upper center of the liner 18, and a pinion 22 that is pivotally supported by the beam 19 meshes with the sect gear 21. When the pinion 22 is driven by a drive mechanism (not shown), the liner 18
The upper roller group can swing about point A as a fulcrum via the upper frame 18. Furthermore, a lowering screw 23 whose lower end is in contact with the upper surface of the beam 19 is installed at the upper part of the housing 15, and by driving the lowering screw 23 by a drive device (not shown), the upper roller group is moved up and down. It has become.

Also, each leveling roller 1'l+ 1-2...1
-11, on the exit side, a pinch roller device 25,28 comprising a pair of upper and lower pinch rollers 24, 24 as a tension applying device is supported by the housing 15 via bearings 27,28, respectively. The pinch rollers 14 are each configured to be movable up and down. In addition, 29.30 is the reducer, 3
1.32 is an electric motor.

Furthermore, each leveling roller 1-1. 1-2...1
．． -1+ supporting axle boxes 14-+, 14-2...
On the upstream side surface of 14-II, load cells 3L1 + 33-2...3 are installed so as to be in contact with the axle boxes located on the upstream side, respectively.
3-II is installed.

In addition, the load cell 33 attached to the axle box 14-+ + 14-2
-+.

33-2 is in contact with the window portion of the housing 15.

Now, leveling roller 1-1. 1-2 is used as a roller that applies a braking action to the member P together with the input side pinch roller device 25, and the remaining leveling rollers 1-3 to 1-1I are used as rollers that apply tension to the plate material P together with the output side pinch roller device 26. For example, the tension generated in the plate P is shown in FIG. However, in FIG. 4, TIl: brake force (tension) of the pinch roller device on the two-person side, TD: tension of the pinch roller device on the output side TI, T2. ...TN: The reaction force of the tension TE generated in the input side pinch roller device 25 due to the additional tension or braking force of each leveling roller is applied to the bearing 27 and the input side support section 15 of the housing 15.
It is divided into two parts via a and acts on load cells 33-1 and 33-2. On the other hand, the reaction force of the tension To generated in the outlet pinch roller device 26 is caused by the bearing 28, the outlet support column 15b1 of the housing 15, and the upper and lower beam portions 15c, 15d of the housing 15.
is transmitted to the entry side support portion 15a via the entry side tension T
Since it acts in a direction that cancels the reaction force of E, these relationships are expressed by equation 0).

TE-TD-Tt+Tb...α) Here, Tt: Upper part of the tension of the pinch roller device on the exit side measured by the load cell 33-1 - R side branch flow molecule b: Measured by the load cell 33-2 All load cells 33-+, 33-2...
The tension measured at 33-N is as shown in Table-2.

Table 2 From Table 2, for example, the tension TI applied by the leveling roller 1-1 can be determined as the difference between the measured value Tj +T1 of the load cell 33-2 and the measured value Tt of the load cell 33-1. Similarly, T3 is the total it+ll value T3 of the load cell 33-3.
+T! It can be obtained as the difference between l+...+TN and the measured value T5+...+TN of G:i ml' 33-5. In this way, the added tension of all leveling rollers can be determined.

By the way, since there is a proportional relationship between the tensions TE and TO generated in the pinch roller devices 25 and 26 and the current values of the respective motors 31 and 32, by measuring the current values, T
It is possible to calculate E and TD backwards. As a result, the fourth
From the figure, for example, the total tension between the leveling rollers 1-2, 1-3 can be determined as TE+TI +T2 or TO+T3 +T4-+-=+T1+, and the total tension between all the leveling rollers can be determined in the same way. When the total tension differs from the preset value, the current value of each electric motor 9 is controlled to bring it closer.

In this way, the energy and tension necessary for bending the plate material P can be separated and only the tension can be controlled.

In the above embodiment, the leveling rollers are divided into an upstream group and a downstream group between the second and third leveling rollers, but this separation is not limited to between the second and third leveling rollers, but can be performed electrically as desired. In addition, the tension generated in the pinch roller devices 25 and 26 is calculated backward from the current values of the respective motors 31 and 32, but this also applies to the respective bearings 27 and 28 and the strut portion 15a of the housing 15.
, 15b, and the load cell is used to perform TE,
TC) may be measured. Further, it is preferable that the load cell is located on a straight line connecting the axes of the bearings of each leveling roller (such as the load cells 33-+ and 33-2 for the axle boxes 14-+ and 14-2); In general, the spacing between each bearing is narrow and there is no space to install a load meter. Therefore, as shown in FIG. 5, it is necessary to devise a method for installing the roller at a distance RL+ from the axis of the roller.

In this case, if the protrusion 34 is provided at a distance on the opposite side of the shaft center and brought into contact with the axle box located on the upstream side together with the load cell 33, the tension T can be adjusted to the measured value of the load cell 33. It is calculated as R1.

[Effects of the Invention] As explained above, according to the roller straightening machine of the present invention, tension can be applied to the plate H without causing slippage between each leveling roller and the plate material, and the following effects can be achieved. Therefore, the flatness correction effect of the plate material can be improved.

(II) Since it is possible to accurately measure the total tension generated on the plate between each leveling roller and the additional tension that each leveling roller can apply, the tension is as high as possible without causing slippage between the plate and the leveling roller. Therefore, the orthodontic effect can be significantly improved.

It can produce excellent effects such as

[Brief explanation of the drawing]

Fig. 1 is a partial plan view of the roller straightening machine of the present invention, Fig. 2 is a view from the ■-■ arrow in Fig. 1, Fig. 3 is a view from the -m arrow in Fig. 1, and Fig. 4 is a plate material. 5 is a side view of the installation of the load cell, FIG. 6 is a plan view of a conventional roller straightening machine, and FIG. 7 is a view from the ■-■ arrow in FIG. 6. Figures 8 to 10 are explanatory diagrams of the principle of straightening in a recently devised cola straightening machine, Figure 11 is a graph showing the circumferential speed of the leveling roller, and Figure 12 is a recently devised roller straightening machine. Fig. 13 is an explanatory diagram of the machine, Fig. 13 is a ℃-℃ arrow view of Fig. 12, Fig. 14 is an explanatory diagram of another conventional roller straightening machine, Fig. 15
The figure is a view taken along arrows XV-XV in Fig. 14, Fig. 16 is an explanatory diagram of the tensile force acting on the plate material when a conventional roller straightening machine is driven, and Fig. 17 is a recently devised other roller straightening machine. The plan view of the machine, Fig. 18, is a flat-shoulder view of Fig. 17, Fig. 19
The figure is an explanatory diagram of the tensile force acting on the plate material when the roller straightening machine of Figures 17 and 18 is driven. 1 is a leveling roller, 3 is a universal shaft, 9 is an electric shaft, 14 is an axle box, 25, 2fi is a pinch roller device, 3
3 indicates a weight meter. Fig. 2 Fig. 10 Cutting Fig. 11 D-51 R - Fig. 6 Fig. 7 b b Joy 8 Fig. 9 Fig. 16 Fig. 18 Fig. 17 Fig. 19 Rei Rinder Roller Scent →

Claims (1)

[Claims] 1) A roller straightening machine in which all leveling rollers can be driven independently, characterized in that a load meter for measuring tension is attached to a separate shaft box supporting each leveling roller.