CN212598053U - Stretch bending straightening machine - Google Patents

Abstract

The utility model discloses a stretch bending straightener, at the operation in-process, with the strip around in proper order on first tension roller set, bending roll are right, the leveling roller is right and the second tension roller set for the strip loops through first tension roller set, bending roll is right, the leveling roller is right and the second tension roller set. Because the first tension roller group and the second tension roller group are respectively positioned at two sides of the frame, the belt materials on the bending roller pair and the straightening roller pair are all in a tensioning state through the first tension roller group and the second tension roller group, and the belt materials are effectively stretched in the stretch bending and straightening processes. Further, since the pair of bending rolls acts on the strip before the pair of straightening rolls, the strip of the present embodiment is bent and deformed before being straightened. Uniformly distributing residual deformation of each part on the strip through a bending roller pair; and then, straightening and eliminating the residual deformation on the strip through a straightening roller pair, so that the three-dimensional plate shape defects on the strip are effectively corrected, and the straightening effect of the strip is greatly improved.

Description

Stretch bending straightening machine

Technical Field

The utility model relates to a machine tooling technical field especially relates to a stretch bending straightening machine.

Background

After the aluminum plate strip passes through a rolling mill, the shape of a coiled strip is poor due to the shapes of a roll shape, a roll gap and the like, and the coiled strip generates waves (double-side waves, single-side waves, middle waves and double-rib waves), warping, side bending, buckling, potential shape defects and the like. These defects occur as a result of internal stress arising from uneven longitudinal extension of the rolled stock in the width direction, and the rolled strip needs to be corrected in order to eliminate the poor strip shape of the rolled strip and to make the internal stress uniform. However, the conventional stretch-bending straightener has the defects of poor straightening effect, such as: the processing thickness of the existing stretch bending straightener can only reach 3.0mm generally, and the existing stretch bending straightener cannot be good for materials with the thickness of more than 3.0 mm; meanwhile, in the aspect of improving the plate shape, the flatness of the existing straightener can only be ensured to 10I units.

SUMMERY OF THE UTILITY MODEL

Therefore, a stretch bending straightener with good straightening effect is needed.

The technical scheme is as follows:

a stretch bend leveler comprising: a frame; the straightening mechanism is arranged on the rack and comprises a bending roller pair and a straightening roller pair, the bending roller pair and the straightening roller pair are arranged at intervals along the conveying direction of a strip, the bending roller pair is used for bending the strip, and the straightening roller pair is used for straightening the strip; the first tension roller set and the second tension roller set are respectively positioned on two opposite sides of the rack, the first tension roller set, the bending roller pair, the straightening roller pair and the second tension roller set are sequentially used for winding the strip, and the first tension roller set and the second tension roller set are used for tensioning the strip.

In the stretch bending straightener, in the operation process, the strip is sequentially wound on the first tension roller set, the bending roller pair, the straightening roller pair and the second tension roller set, so that the strip sequentially passes through the first tension roller set, the bending roller pair, the straightening roller pair and the second tension roller set. Because the first tension roller group and the second tension roller group are respectively positioned at two sides of the frame, the belt materials on the bending roller pair and the straightening roller pair are all in a tensioning state through the first tension roller group and the second tension roller group, and the belt materials are effectively stretched in the stretch bending and straightening processes. And because the bending roller pair acts on the strip before the straightening roller pair, the strip is bent and deformed firstly and then straightened. Uniformly distributing residual deformation of each part on the strip through a bending roller pair; and then, straightening and eliminating the residual deformation on the strip through a straightening roller pair, so that the three-dimensional plate shape defects on the strip are effectively corrected, and the straightening effect of the strip is greatly improved. Meanwhile, the stretch bending straightener adopts the structural design of bending firstly and straightening secondly, so that the strips with the thickness within 4.0mm can be well straightened, and the processing thickness range of the stretch bending straightener can be widened.

The principle and effect of the present invention will be further explained by combining the above scheme:

in one embodiment, the bending roller pair comprises a first bending roller set and a second bending roller set which are arranged on the machine frame, the first bending roller set and the second bending roller set are respectively used for being positioned at two opposite sides of the strip material, and one end of the first bending roller set and one end of the second bending roller set are respectively used for being pressed on the two opposite sides of the strip material in a staggered mode.

In one embodiment, the stretch bending straightener further comprises a first driving member in driving engagement with the first bending roller set, the first bending roller set is movably mounted on the frame, and the first driving member is used for driving one end of the first bending roller set to press one side of the strip.

In one embodiment, the first bending roller set comprises a first mounting seat and a first working roller which is rotatably arranged on the first mounting seat, the first mounting seat is rotatably arranged on the machine frame and is connected with an output shaft of the first driving piece, and the first working roller is used for pressing one side of the strip.

In one embodiment, the second bending roller set comprises a second mounting seat and a second working roller rotatably mounted on the second mounting seat, the second mounting seat is mounted on the machine frame, the second working roller and the first working roller are arranged in a staggered manner, and the second working roller and the first working roller are respectively used for pressing two opposite side surfaces of the strip.

In one embodiment, the straightening roller pair comprises a straightening roller group and a third bending roller group, the straightening roller group and the third bending roller group are respectively used for being positioned at two opposite sides of the strip, and one end of the straightening roller group and one end of the third bending roller group are respectively used for being pressed on the two opposite sides of the strip in a staggered mode.

In one embodiment, the stretch bending straightener further comprises a second driving element for driving one end of the straightening roller group or the third bending roller group to press against the strip.

In one embodiment, the straightening roller group comprises a third mounting seat arranged on the machine frame and a third working roller rotating on the third mounting seat, the third bending roller group comprises a fourth mounting seat arranged on the machine frame and a fourth working roller rotating on the fourth mounting seat, the diameter of the third working roller is larger than that of the fourth working roller, and the third working roller and the fourth working roller are used for being pressed on two opposite side surfaces of the strip in a staggered mode.

In one embodiment, the stretch bending straightener further comprises an operation table and a roll changing assembly which is slidably arranged on the operation table, the rack is arranged on the operation table, a roll changing window is arranged on the rack, and the roll changing assembly is used for performing roll changing operation on the straightening mechanism through the roll changing window.

In one embodiment, the roll changing assembly comprises a supporting seat and a screw jack arranged on the supporting seat, the supporting seat is slidably arranged on the operating platform, and the screw jack is used for lifting the roll in the straightening mechanism.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a stretch bending straightener according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a stretch bending straightener according to an embodiment of the present invention;

FIG. 3 is a diagram showing the operation effect of two types of the straightening roll sets and the bending roll sets according to an embodiment of the present invention.

Description of reference numerals:

100. a stretch bending straightener, 110, a frame, 111, a first drive, 112, a second drive, 113, a roll changing window, 120, a straightening mechanism, 121, a pair of bending rolls, 1211, a first set of bending rolls, 12111, a first mounting seat, 12112, a first work roll, 1212, a second set of bending rolls, 12121, a second mounting seat, 12122, a second work roll, 122, a pair of straightening rolls, 1221, a straightening roll set, 12211, a third mounting seat, 12212, a third work roll, 1222, a third set of bending rolls, 12221, a fourth mounting seat, 12222, a fourth work roll, 123, an intermediate roll, 124, a support roll, 130, a first set of tension rolls, 131, a first tension roll, 132, a second tension roll, 140, a second set of tension rolls, 150, a first guide roll, 160, a second guide roll, 170, a roll changing assembly, 171, a support seat, 172, a jack, 173, a gear motor, 180, an operation table, 181, a guide rail 200, and a second guide rail, A strip of material.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the present invention, the terms "first" and "second" do not denote any particular quantity or order, but are merely used to distinguish names.

In one embodiment, referring to fig. 1 and 2, a stretch bending straightener 100 includes: a frame 110, a straightening mechanism 120, a first tension roller set 130 and a second tension roller set 140. The straightening mechanism 120 is mounted on the frame 110, and the straightening mechanism 120 includes a pair of bending rolls 121 and a pair of straightening rolls 122. The pair of bending rollers 121 and the pair of straightening rollers 122 are provided at intervals along the conveying direction of the strip 200, the pair of bending rollers 121 is used for bending the strip 200, and the pair of straightening rollers 122 is used for straightening the strip 200. The first tension roller set 130 and the second tension roller set 140 are respectively located at two opposite sides of the frame 110, the first tension roller set 130, the bending roller pair 121, the straightening roller pair 122 and the second tension roller set 140 are sequentially used for winding the strip 200, and both the first tension roller set 130 and the second tension roller set 140 are used for tensioning the strip 200.

In the stretch bender 100, during operation, the strip 200 is sequentially wound around the first tension roller set 130, the bending roller pair 121, the straightening roller pair 122, and the second tension roller set 140, so that the strip 200 sequentially passes through the first tension roller set 130, the bending roller pair 121, the straightening roller pair 122, and the second tension roller set 140. Because the first tension roller set 130 and the second tension roller set 140 are respectively located at two sides of the frame 110, the first tension roller set 130 and the second tension roller set 140 ensure that the strip 200 on the bending roller pair 121 and the straightening roller pair 122 are in a tensioned state, so that the strip 200 is effectively stretched in the stretch bending and straightening processes. Since the pair of bending rollers 121 acts on the strip material 200 prior to the pair of straightening rollers 122, the strip material 200 of the present embodiment is bent and deformed before being straightened. The residual deformation of each part on the strip material 200 is uniformly distributed through the bending roller pair 121; then, the straightening of the residual deformation on the strip 200 is eliminated by the straightening roller pair 122, so that the three-dimensional plate shape defects on the strip 200 are effectively corrected, and the straightening effect of the strip 200 is greatly improved. Meanwhile, the stretch bending straightener 100 adopts the structural design of bending first and straightening second, so that the strip 200 with the thickness within 4.0mm can be well straightened, and the processing thickness range of the stretch bending straightener 100 can be widened. In addition, in the actual operation, the flatness of the strip 200 can reach 3I (I is the unit of flatness) after being processed by the stretch bending leveler 100 of the embodiment.

It should be noted that the first tension roller set 130 and the second tension roller set 140 each include a first tension roller 131 and a second tension roller 132 that are arranged side by side, and the strip 200 is wound around the first tension roller 131 and the second tension roller 132 in an "S" shape, so as to ensure that the strip 200 has sufficient tension. Meanwhile, a tension meter is provided at the second tension roller group 140 to test the surface tension of the strip 200. Wherein the strip 200 may be a steel sheet or an aluminum alloy sheet.

Further, referring to fig. 2, the bending roller pair 121 includes a first bending roller set 1211 and a second bending roller set 1212 mounted on the frame 110. The first and second bending roller sets 1211 and 1212 are adapted to be positioned on opposite sides of the strip 200, respectively, and one end of the first and second bending roller sets 1211 and 1212 are adapted to be offset pressed against opposite sides of the strip 200, respectively. In this way, when the strip 200 passes through the bending roller pair 121, the strip 200 is bent in different directions by the first bending roller set 1211 and the second bending roller set 1212, so that the strip 200 is subjected to alternating deformation, and the strip 200 is extended greatly, thereby facilitating uniform distribution of residual deformation.

It should be noted that the first bending roller set 1211 pressing on the strip 200 with one end thereof offset from the second bending roller set 1212 is understood to be: the pressure points of the first set of bending rollers 1211 on the strip material 200 are spaced apart from the pressure points of the second set of bending rollers 1212 on the strip material 200.

Specifically, referring to fig. 2, a first set of bending rollers 1211 is positioned above a second set of bending rollers 1212 on the frame 110.

Further, referring to FIG. 2, stretch bender 100 further includes a first drive 111 in driving engagement with first set of bending rollers 1211. The first bending roller set 1211 is movably installed on the frame 110. The first drive 111 is used to drive one end of the first set 1211 of bending rollers against one side of the strip 200. Therefore, the first driving member 111 can effectively adjust the pressing amount of the first bending roller group 1211, and ensure stable operation of the first bending roller group 1211 and the second bending roller group 1212.

The first bending roller group 1211 moves on the frame 110 in a rotational manner, a vertical movement manner, or the like.

Alternatively, the first driving member 111 is a cylinder, a hydraulic cylinder, an electric cylinder, or a combination of an electric motor and a link mechanism, etc.

In one embodiment, referring to fig. 2, the first bending roller set 1211 includes a first mounting seat 12111 and a first work roller 12112 rotatably mounted on the first mounting seat 12111. The first mounting seat 12111 is rotatably mounted on the frame 110 and connected to the output shaft of the first driving member 111. The first work roll 12112 is used to press against one side of the strip 200. Therefore, when the pressing amount of the first working roll 12112 is adjusted, the first driving member 111 is activated to rotate the first mounting seat 12111 on the frame 110, and the rotated first mounting seat 12111 rotates the first working roll 12112, so that the first working roll 12112 is pressed onto the strip 200.

Further, referring to fig. 2, the second bending roller set 1212 includes a second mounting seat 12121 and a second work roller 12122 rotatably mounted on the second mounting seat 12121. The second mounting seat 12121 is mounted on the frame 110. The second working roll 12122 is arranged in a staggered manner with respect to the first working roll 12112, and the second working roll 12122 and the first working roll 12112 are respectively used for pressing on two opposite sides of the strip material 200, so that the first working roll 12112 and the second working roll 12122 after being pressed down are respectively pressed on two opposite sides of the strip material 200 in a staggered manner, so that the strip material 200 is bent back and forth on the first working roll 12112 and the second working roll 12122, and the strip material 200 is extended greatly in both the transverse direction and the longitudinal direction, which is beneficial to more uniform distribution of residual deformation on the strip material 200.

It should be noted that, in order to facilitate understanding of the bending effect of the first work roll 12112 and the second work roll 12122, please refer to fig. 3, wherein fig. 3(a) shows the effect of the strip material 200 passing through the first work roll 12112 and the second work roll 12122.

It should be further noted that the first mounting seat 12111 and the second mounting seat 12121 are both provided with the intermediate roller 123 and the support roller 124, and the intermediate roller 123 is located between the support roller 124 and the first working roller 12112 or the second working roller 12122, so as to ensure that the first working roller 12112 and the second working roller 12122 operate stably.

Specifically, referring to fig. 2, there are two intermediate rollers 123 and three support rollers 124. Meanwhile, the purging devices are arranged at the first working roll 12112 and the second working roll 12122, so that the first working roll 12112 and the second working roll 12122 are clean and tidy, and the sundries on the first working roll 12112 and the second working roll 12122 are prevented from embossing the plate surface of the strip 200. Further, both ends of the first work roll 12112 and the second work roll 12122 are provided with bearings.

Specifically, referring to fig. 2, the first working roll 12112 and the second working roll 12122 are fixed to the first mounting seat 12111 and the second mounting seat 12121, respectively, by hydraulic nuts.

In one embodiment, the frame 110 is provided with a sensor for sensing the distance the first working roll 12112 is pressed in, so that the pressing amount of the first working roll 12112 can be accurately controlled by the sensor, thereby effectively improving the stretch-bending straightening accuracy of the strip material 200.

In one embodiment, referring to FIG. 2, the straightening roller pair 122 includes a set of straightening rollers 1221 and a third set of bending rollers 1222. The set of leveling rollers 1221 and the set of third bending rollers 1222 are adapted to be positioned on opposite sides of the strip 200, respectively, and one end of the set of leveling rollers 1221 and one end of the set of third bending rollers 1222 are adapted to be pressed in a staggered manner on opposite sides of the strip 200, respectively. In this way, the strip 200 after being bent a plurality of times is effectively straightened by the straightening roller set 1221 and the third bending roller set 1222.

It should be noted that the situation where one end of the straightening roller set 1221 is pressed against the strip 200 in a staggered manner from one end of the third bending roller set 1222 is understood as follows: the pressure points of the set of leveling rollers 1221 on the strip 200 are spaced from the pressure points of the third set of bending rollers 1222 on the strip 200.

Specifically, referring to fig. 2, the straightening roller group 1221 and the third bending roller group 1222 are distributed up and down along the height direction of the frame 110, i.e., the straightening roller group 1221 may be located above the third bending roller group 1222; alternatively, the straightener roll group 1221 may be positioned below the third bending roll group 1222.

Further, referring to FIG. 2, the stretch bender 100 further comprises a second driving member 112. The second drive 112 is used to drive one end of the set of leveling rollers 1221 or the third set of bow rollers 1222 against the strip 200. It can be seen that the roller sets 1221 and 1222 are movable on the frame 110, that is, the second driving device 112 can adjust the pressing amount of the roller sets 1221 and 1222 to the strip 200, so as to ensure the stable operation of the roller sets 1221 and 1222 to the strip 200.

The leveling roller group 1221 or the third bending roller group 1222 is movable on the frame 110, for example, by being rotated or moved up and down.

Alternatively, the second driving member 112 is a cylinder, a hydraulic cylinder, an electric cylinder, or a combination of an electric motor and a link mechanism.

Further, referring to FIG. 2, the leveler roller group 1221 includes a third mounting base 12211 mounted on the frame 110, and a third work roll 12212 rotated on the third mounting base 12211. The third bending roller set 1222 includes a fourth mounting base 12221 mounted on the frame 110, and a fourth work roller 12222 rotated on the fourth mounting base 12221. The diameter of the third work roll 12212 is larger than the diameter of the fourth work roll 12222. The third 12212 and fourth 12222 work rolls are arranged to be offset on opposite sides of the strip 200. Therefore, when the strip 200 passes through the straightening roller set 1221, the pressing amount of the third working roller 12212 or the fourth working roller 12222 is adjusted by the second driving unit 112, so that the third working roller 12212 and the fourth working roller 12222 respectively press on two opposite sides of the strip 200, and the pressing points of the third working roller 12212 and the fourth working roller 12222 on the strip 200 are ensured to be staggered, so that the bent strip 200 is effectively corrected.

It should be noted that, for the convenience of understanding the bending effect of the third working roll 12212 and the fourth working roll 12222, referring to fig. 3, fig. 3(b) and fig. 3(c) are both the effect of the strip 200 passing through the third working roll 12212 and the fourth working roll 12222, however, fig. 3(b) shows the third working roll 12212 located behind the fourth working roll 12222, i.e., the fourth working roll 12222 acts on the strip 200 before the third working roll 12212, and fig. 3(c) shows the fourth working roll 12222 located behind the third working roll 12212, i.e., the third working roll 12212 acts on the strip 200 before the fourth working roll 12222.

It should be noted that the fourth mounting seat 12221 is also provided with the middle roller 123 and the support roller 124, and the middle roller 123 is located between the support roller 124 and the fourth working roller 12222, so as to ensure the stable operation of the fourth working roller 12222. Meanwhile, the third mounting seat 12211 is also provided with a support roller 124, and the third working roller 12212 is supported on the support roller 124.

Specifically, the purging devices are also installed at the third working roll 12212 and the fourth working roll 12222, so that the third working roll 12212 and the fourth working roll 12222 are clean and tidy, and the surface of the sundry embossed tape 200 on the third working roll 12212 and the fourth working roll 12222 is avoided. In addition, the third working roll 12212 and the fourth working roll 12222 are provided with bearings at both ends.

Specifically, the third working roll 12212 and the fourth working roll 12222 are fixed to the third mounting base 12211 and the fourth mounting base 12221, respectively, by hydraulic nuts.

In one embodiment, referring to fig. 2, there are two straightening roller pairs 122, and two straightening roller pairs 122 are spaced apart along the conveying direction of the strip 200, wherein in one straightening roller pair 122, the straightening roller set 1221 is located above the third bending roller set 1222; in the other straightening roller pair 122, the straightening roller set 1221 is located below the third bending roller set 1222, so that the strip 200 is subjected to straightening operations in different directions, ensuring a higher flatness of the strip 200.

Specifically, referring to FIG. 2, the upper straightening roll set 1221 and the third bending roll set 1222 are rotatably mounted on the frame 110 and are respectively in driving engagement with the two second driving members 112. Further, of the straightening roller pairs 122 near the second tension roller group 140, the straightening roller group 1221 is located above the third bending roller group 1222 and on the side of the third bending roller group 1222 facing away from the second tension roller group 140; in the other straightening roller pair 122, the straightening roller group 1221 is located below the third bending roller group 1222 and on the side of the third bending roller group 1222 toward the second tension roller group 140.

In one embodiment, referring to FIG. 1, stretch bender 100 further comprises a table 180 and a roll change assembly 170 slidably mounted on table 180. The frame 110 is installed on the operation table 180, the frame 110 is provided with a roll changing window 113, and the roll changing assembly 170 is used for performing a roll changing operation on the straightening mechanism 120 through the roll changing window 113. Therefore, when the stretch bending straightener 100 needs to replace the roller, the roller replacing assembly 170 is pushed to the rack 110, so that the roller replacing assembly 170 replaces the roller through the roller replacing window 113, and thus, the roller replacing operation of the stretch bending straightener 100 is performed on line, the maintenance time of the stretch bending straightener 100 is greatly saved, and the production efficiency of the stretch bending straightener 100 is improved.

Further, referring to fig. 1, the roll changing assembly 170 includes a support 171 and a screw jack 172 installed on the support 171. The support 171 is slidably mounted on the table 180. The screw jack 172 is used for lifting the roller in the straightening mechanism 120, so that the roller is loosened in the roller changing process (usually, a hydraulic nut is adopted to automatically loosen the roller); the roller is fixed by the screw jack 172; after the fixing, the supporting seat 171 is pulled so that the roller is removed from the frame 110.

Specifically, referring to fig. 1, a guide rail 181 is disposed on the console 180, and the supporting seat 171 is slidably mounted on the guide rail 181. Meanwhile, a gear motor 173 is further disposed on the supporting seat 171, and the movement of the supporting seat 171 on the guide rail 181 is automatically controlled through the gear motor 173.

In one embodiment, referring to fig. 2, a first guide roll 150 and a second guide roll 160 are disposed on two opposite sides of the frame 110, and the strip 200 is sequentially wound around the first tension roll group 130, the first guide roll 150, the straightening mechanism 120, the second guide roll 160 and the second tension roll group 140.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A stretch bending straightener, comprising:

a frame;

the straightening mechanism is arranged on the rack and comprises a bending roller pair and a straightening roller pair, the bending roller pair and the straightening roller pair are arranged at intervals along the conveying direction of a strip, the bending roller pair is used for bending the strip, and the straightening roller pair is used for straightening the strip; and

the first tension roller set and the second tension roller set are respectively located on two opposite sides of the rack, the first tension roller set, the bending roller pair, the straightening roller pair and the second tension roller set are sequentially used for winding the strip, and the first tension roller set and the second tension roller set are used for tensioning the strip.

2. A stretch-bending straightener according to claim 1, wherein the pair of bending rolls comprises a first bending roll group and a second bending roll group mounted on the frame, the first bending roll group and the second bending roll group are respectively for being located on opposite sides of the strip, and one end of the first bending roll group and one end of the second bending roll group are respectively for being pressed on opposite sides of the strip in a staggered manner.

3. A stretch-bending straightener according to claim 2, further comprising a first drive in driving engagement with the first set of bending rollers, the first set of bending rollers being movably mounted on the frame, the first drive being adapted to urge one end of the first set of bending rollers against one side of the strip.

4. A stretch-bending straightener according to claim 3, wherein the first bending roller group comprises a first mounting base and a first working roller rotatably mounted on the first mounting base, the first mounting base being rotatably mounted on the frame and being connected to the output shaft of the first driving member, the first working roller being adapted to press against one side of the strip.

5. The stretch-bending straightener of claim 4, wherein the second bending roller group comprises a second mounting base and a second working roller rotatably mounted on the second mounting base, the second mounting base is mounted on the frame, the second working roller is staggered from the first working roller, and the second working roller and the first working roller are respectively used for pressing on two opposite sides of the strip.

6. The stretch-bending straightener according to claim 1, wherein the straightening roller pair comprises a straightening roller group and a third bending roller group, the straightening roller group and the third bending roller group are respectively used for being positioned at two opposite sides of the strip material, and one end of the straightening roller group and one end of the third bending roller group are respectively used for being pressed on the two opposite sides of the strip material in a staggered manner.

7. A stretch-bending straightener according to claim 6, characterized in that it further comprises a second drive for driving one end of the straightening roller group or the third bending roller group against the strip.

8. The stretch-bending straightener of claim 7, wherein the straightener roll group comprises a third mounting base mounted on the frame and a third working roll rotating on the third mounting base, the third bending roll group comprises a fourth mounting base mounted on the frame and a fourth working roll rotating on the fourth mounting base, the diameter of the third working roll is larger than that of the fourth working roll, and the third working roll and the fourth working roll are used for being pressed on two opposite sides of the strip in a staggered manner.

9. The stretch bending straightener according to any one of claims 1 to 8, further comprising an operation table and a roll changing assembly slidably mounted on the operation table, wherein the frame is mounted on the operation table, a roll changing window is provided on the frame, and the roll changing assembly is used for performing a roll changing operation on the straightening mechanism through the roll changing window.

10. The stretch-bending straightener as claimed in claim 9, wherein the roll changing assembly comprises a support base slidably mounted on the operating table and a lead screw jack mounted on the support base for lifting the rolls in the straightening mechanism.

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