A stretching machine

Abstract

This invention relates to the field of sheet metal stretching equipment, and provides a stretching machine including a track and two stretching heads mounted on the track; at least one set of transverse straightening rollers covering the stretching length of the sheet metal are installed on the track and between the two stretching heads. The stretching machine provided by this invention, by setting transverse straightening rollers covering the stretching length of the sheet metal between the two stretching heads, can perform real-time transverse straightening of the sheet metal throughout its entire stretching length. Compared with existing technologies, it eliminates the need for manual visual inspection of the deformation and location of the sheet metal along its width direction, solving the problem of poor straightening quality caused by visual inspection errors in existing technologies, and improving the straightening quality of the sheet metal.

Description

Technical Field

[0001] This invention relates to the field of sheet metal stretching equipment, and in particular to a stretching machine. Background Technology

[0002] Stretching machines can eliminate internal stress and straighten sheet materials during stretching, thus improving sheet quality. While the straightness along the length of the stretched sheet is excellent, the straightness along the width not only fails to improve but actually worsens, especially for thin sheets where deformation along the width is more severe. Currently, a straightening carriage is often used in conjunction with the stretching machine to straighten the sheet material and address the problem of deformation along the width.

[0003] The straightening process of the straightening trolley is as follows: The straightening trolley is placed on the track of the stretching machine, positioned between the two stretching heads, and can move between them. The deformation and location of the sheet metal along its width are determined visually. The straightening trolley is then manually moved to the first position, and the straightening rollers are raised to straighten the sheet metal until it is visually flattened along its width. The straightening trolley is then moved to the next position for straightening until the sheet metal is completely flattened. However, this straightening method has disadvantages such as large visual error, poor straightening quality, low straightening efficiency, and a large workload for manual operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a stretching machine to improve the straightening quality of sheet metal.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a stretching machine, including a track and two stretching heads arranged on the track; at least one set of transverse straightening rollers covering the stretching length of the plate are installed on the track and between the two stretching heads.

[0006] Furthermore, the transverse straightening roller device includes a base mounted on a track, a straightening frame mounted above the base via a lifting mechanism, and at least two straightening rollers evenly spaced above the straightening frame along the stretching direction of the sheet material; the straightening rollers are arranged perpendicular to the stretching direction of the sheet material, and their two ends are rotatably connected to the straightening frame via roller seats.

[0007] Furthermore, vertically positioned positioning plates are fixed at both ends of the straightening frame along the stretching direction of the sheet material; the distance between the outer surface of the positioning plate and the center line of the nearest straightening roller is equal to half the distance between the center lines of two adjacent straightening rollers.

[0008] Furthermore, the transverse straightening roller device includes at least two sets; the outer surfaces of the positioning plates in adjacent transverse straightening roller devices are abutted together.

[0009] Furthermore, the straightening frame is equipped with at least one set of support roller devices located below the straightening rollers and used to support each straightening roller.

[0010] Furthermore, the support roller device includes a support frame mounted on the straightening frame, and two support rollers mounted on the support frame and symmetrically arranged on both sides of the straightening roller.

[0011] Furthermore, the roller holder includes a seated bearing, a guide sleeve, a guide block, a pull rod, a compression spring, and a stop block; the seated bearing is mounted on the straightening roller; the guide sleeve is disposed below the seated bearing and fixedly connected to the straightening frame; the guide sleeve has a vertically arranged guide cavity with an open upper end; the guide block is slidably fitted in the guide cavity and fixedly connected to the seated bearing; the pull rod is disposed in the guide cavity, its upper end is fixedly connected to the guide block, and its lower end passes through the bottom wall of the guide cavity and is fixedly connected to the stop block disposed below the guide sleeve; the compression spring is disposed in the guide cavity and sleeved on the pull rod; when the stop block abuts against the bottom of the guide sleeve under the action of the compression spring, the straightening roller separates from the support roller device.

[0012] Furthermore, a guide device is provided between the straightening frame and the base; the guide device includes a vertically arranged guide shaft and a sliding sleeve sleeved on and slidably engaged with the guide shaft; the guide shaft and the sliding sleeve are respectively fixedly connected to one of the straightening frame and the base.

[0013] Furthermore, two sets of synchronization devices are provided between the straightening frame and the base; the two sets of synchronization devices are arranged at intervals along the stretching direction of the sheet metal; the synchronization device includes a horizontally arranged synchronization shaft that is rotatably connected to the base, gears fixed at both ends of the synchronization shaft, and a rack fixed on the straightening frame and meshing with each gear.

[0014] Furthermore, the lifting mechanism includes at least one vertically arranged hydraulic cylinder; the cylinder body of the hydraulic cylinder is connected to the base, and the piston rod of the hydraulic cylinder is connected to the straightening frame.

[0015] The beneficial effects of the present invention are as follows: The stretching machine provided in the embodiments of the present invention, by setting a transverse straightening roller device covering the stretching length of the plate between two stretching heads, can perform transverse straightening of the plate in real time within the entire stretching length of the plate. Compared with the prior art, it eliminates the need for manual visual inspection of the deformation and deformation position of the plate along the width direction, thus solving the problem of poor straightening quality caused by visual inspection errors in the prior art and improving the straightening quality of the plate. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the stretching machine provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of two sets of transverse straightening roller devices installed on the track;

[0019] Figure 3 yes Figure 2 The left view;

[0020] Figure 4 yes Figure 2 Top view;

[0021] Figure 5 This is a schematic diagram of the roller holder structure.

[0022] The attached diagram is labeled as follows: 1-track, 2-tensioning head, 3-transverse straightening roller device, 4-sheet stretching direction, 5-sheet material, 31-base, 32-lifting mechanism, 33-straightening frame, 34-straightening roller, 35-roller seat, 36-positioning plate, 37-support roller device, 38-guide device, 39-synchronization device, 311-anti-tipping plate, 351-bearing with seat, 352-guide sleeve, 353-guide block, 354-pull rod, 355-compression spring, 356-stop block, 357-guide cavity, 371-support frame, 372-support roller, 381-guide shaft, 382-sliding sleeve, 391-synchronization shaft, 392-gear, 393-rack. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, it will be further described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0024] See Figure 1 The present invention provides a stretching machine, including a track 1 and two stretching heads 2 disposed on the track 1; at least one set of transverse straightening rollers 3 covering the stretching length of the plate are installed on the track 1 and between the two stretching heads 2.

[0025] The track 1 includes two parallel steel rails for fixing to the foundation to install and support the stretching head 2 and the transverse straightening roller device 3. Two stretching heads 2 are provided on the track 1; one stretching head 2 is fixed to the track 1 when stretching the sheet material, and is called the fixed stretching head; the other stretching head 2 can move on the track 1 when stretching the sheet material, and is called the movable stretching head. When not stretching the sheet material, both stretching heads 2 can move back and forth on the track 1, and the distance between the two stretching heads 2 is the sheet material stretching length L; by controlling the position of the stretching head 2 on the track 1, the sheet material stretching length L can be adjusted.

[0026] The transverse straightening roller device 3 is installed on the track 1 and located between the two stretching heads 2, and is used to straighten the width direction of the sheet 5 during the stretching process. The transverse straightening roller device 3 may include one, two, or more sets. For example, when one set of transverse straightening roller device 3 is set between the two stretching heads 2, the straightening range of this set of transverse straightening roller device 3 along the stretching direction 4 of the sheet can effectively cover the stretching length L of the sheet; when two sets of transverse straightening roller device 3 are set between the two stretching heads 2, these two sets of transverse straightening roller device 3 are assembled together, and the straightening range along the stretching direction 4 of the sheet can effectively cover the stretching length L of the sheet; when two or more sets of transverse straightening roller device 3 are set between the two stretching heads 2, the two or more sets of transverse straightening roller device 3 are assembled together, and the straightening range along the stretching direction 4 of the sheet can effectively cover the stretching length L of the sheet. The transverse straightening roller device 3 may adopt the structure of the stretching machine straightening carriage as described in the authorization announcement number CN207188511U, or other existing structures, which are not specifically limited here.

[0027] The stretching machine provided in this embodiment of the invention, by setting a transverse straightening roller device 3 covering the stretching length of the plate between two stretching heads 2, can perform transverse straightening of the plate 5 in real time within the entire stretching length of the plate. Compared with the prior art, it eliminates the need for manual visual inspection of the deformation and deformation position of the plate along the width direction, reduces the intensity of manual labor, solves the problem of poor straightening quality caused by visual inspection errors in the prior art, and improves the straightening quality of the plate 5.

[0028] See Figure 2 , Figure 3 , Figure 4 The stretching machine provided in this embodiment of the invention includes a transverse straightening roller device 3 comprising a base 31 mounted on a track 1, a straightening frame 33 mounted above the base 31 via a lifting mechanism 32, and at least two straightening rollers 34 evenly spaced above the straightening frame 33 along the sheet stretching direction 4. The straightening rollers 34 are arranged perpendicular to the sheet stretching direction 4, and their two ends are rotatably connected to the straightening frame 33 via roller seats 35.

[0029] See Figure 2 , Figure 3 The base 31 is placed on the two rails of the track 1. Both ends of the base 31 along the extension direction of the track 1 are connected to the rails of the track 1 via anti-tipping devices to prevent the base from tipping over. The extension direction of the track 1 is consistent with the tensile direction 4 of the plate. The anti-tipping device includes two anti-tipping plates 311 symmetrically arranged on both sides of the rails, with a groove formed between the lower sections of the two anti-tipping plates 311 for engaging with the rails. The upper sections of the two anti-tipping plates 311 are fixedly connected to the base 31 by bolts. The straightening frame 33 is positioned above the base 31, and a lifting mechanism 32 is provided between the straightening frame 33 and the base 31, driving the straightening frame 33 to move up and down. (See also...) Figure 3 , Figure 4 At least two straightening rollers 34 are arranged above the straightening frame 33; each straightening roller 34 is horizontally arranged and its axis is perpendicular to the stretching direction 4 of the sheet material; both ends of the straightening roller 34 are rotatably connected to the straightening frame 33 through roller seats 35, so that the straightening roller 34 can rotate around its own axis. The roller seats 35 can be bearings with seats. All straightening rollers 34 are evenly spaced along the stretching direction 4 of the sheet material, and their center lines are at the same height, with a horizontal distance 'a' between the center lines of two adjacent straightening rollers 34. The length of each straightening roller 34 should be greater than or equal to the width of the sheet material 5 to be straightened, so as to ensure that each straightening roller 34 can straighten the sheet material 5 across its entire width.

[0030] When the transverse straightening roller device 3 has N straightening rollers 34, the transverse straightening roller device 3 can be simply referred to as the N-roller device; where N is an integer greater than or equal to 2. See also Figure 1 Four sets of transverse straightening roller devices 3 are provided between the two stretching heads 2, namely a set of two-roller devices, a set of three-roller devices, a set of four-roller devices and a set of five-roller devices.

[0031] The following is combined Figures 1 to 4The working principle of the transverse straightening roller device 3 is explained below. First, according to the stretching length L of the sheet material, four sets of transverse straightening roller devices 3 are selected and installed on the track 1 between the two stretching heads 2, and the sheet material 5 is placed between the two stretching heads 2. Then, the straightening rollers 34 are lifted to a preset height by the lifting mechanism 32, so that the top of the straightening rollers 34 in all the transverse straightening roller devices 3 are at the same height to form a straightening rolling plane. The center of the sheet material 5 supported by this straightening rolling plane coincides with the center of the stretching machine. When the sheet material 5 is stretched by the two stretching heads 2, the sheet material 5 is supported by the straightening rollers 34, and the stretching is changed from the original suspended stretching to stretching on a rolling plane. During the stretching process, when the sheet 5 deforms along the width direction, the sheet 5 presses down on the straightening rolling plane. Since the straightening rolling plane does not descend, it overcomes the deformation of the sheet 5 along the width direction and achieves the straightening purpose. At the same time, since the straightening rolling plane covers the effective stretching length of the sheet along the stretching direction 4, it can straighten the sheet in real time throughout the entire stretching length. Furthermore, when the sheet 5 is stretched, it will drive the straightening roller 34 to rotate, preventing the sheet 5 from sliding against the straightening rolling plane and avoiding damage to the surface of the sheet 5.

[0032] See Figures 2 to 4 The stretching machine provided in this embodiment of the invention has vertically arranged positioning plates 36 fixed at both ends of the straightening frame 33 along the stretching direction 4 of the sheet material; the distance between the outer surface of the positioning plate 36 and the center line of the nearest straightening roller 34 is equal to half the distance between the center lines of two adjacent straightening rollers 34.

[0033] The straightening frame 33 has two positioning plates 36 at each end along the stretching direction 4 of the sheet metal, and the two positioning plates 36 are spaced apart along the axial direction of the straightening roller 34. Each positioning plate 36 is vertically positioned, and its surface facing away from the straightening frame 33 is the outer surface; the distance between the outer surface of the positioning plate 36 and the center line of the nearest straightening roller 34 is b. The distance between the center lines of adjacent straightening rollers 34 in the transverse straightening roller device 3 is a. Where a = 2b.

[0034] The stretching machine provided in this embodiment of the invention, by setting a positioning plate 36 on the straightening frame 33, when the transverse straightening roller device 3 between the two stretching heads 2 includes at least two sets, only needs to put the outer surfaces of the positioning plates 36 in the adjacent transverse straightening roller devices 3 together, so that the distance c = 2b between the adjacent straightening rollers 34 in the two adjacent transverse straightening roller devices 3 can be guaranteed to be consistent.

[0035] See Figures 2 to 4 The stretching machine provided in this embodiment of the invention has at least one set of support roller devices 37 installed on the straightening frame 33, which are located below the straightening rollers 34 and are used to support each straightening roller 34.

[0036] The support roller device 37 is used to support the straightening roller 34. One set of support roller devices 37 can be used to support the straightening roller 34, or two or more sets of support roller devices 37 can be used together to support the straightening roller 34. In this embodiment, each straightening roller 34 is supported by five support roller devices 37, which are evenly arranged along the axial direction of the straightening roller 34.

[0037] See Figure 4 The support roller device 37 includes a support frame 371 mounted on the straightening frame 33, and two support rollers 372 mounted on the support frame 371 and symmetrically arranged on both sides of the straightening roller 34. The support rollers 372 are rotatably mounted on the support frame 371 by pins, so that the support rollers 372 can rotate about their own axes. The lower part of the outer peripheral surface of the straightening roller 34 abuts against the outer peripheral surface of the support rollers 372, thereby supporting the straightening roller 34 on the support rollers 372.

[0038] See Figure 5 The stretching machine provided in this embodiment of the invention includes a roller seat 35 comprising a seated bearing 351, a guide sleeve 352, a guide block 353, a pull rod 354, a compression spring 355, and a stop block 356; the seated bearing 351 is mounted on a straightening roller 34; the guide sleeve 352 is disposed below the seated bearing 351 and fixedly connected to the straightening frame 33; the guide sleeve 352 has a vertically arranged guide cavity 357 with an open upper end; the guide block 353 is slidably fitted within the guide cavity 357. It is fixedly connected to the bearing 351 with a seat; the pull rod 354 is disposed in the guide cavity 357, its upper end is fixedly connected to the guide block 353, and its lower end passes through the bottom wall of the guide cavity 357 and is fixedly connected to the stop block 356 disposed below the guide sleeve 352; the compression spring 355 is disposed in the guide cavity 357 and sleeved on the pull rod 354; when the stop block 356 abuts against the bottom of the guide sleeve 352 under the action of the compression spring 355, the straightening roller 34 separates from the support roller device 37.

[0039] The mounted bearing 351 is a bearing unit that combines a rolling bearing and a bearing housing. When the mounted bearing 351 is installed at the end of the straightening roller 34, the straightening roller 34 can rotate relative to the mounted bearing 351 around its own axis. The guide block 353 and the guide cavity 357 of the guide sleeve 352 are adapted cylindrical structures; by placing the guide block 353 inside the guide cavity 357 of the guide sleeve 352, when the guide block 353 moves up and down within the guide cavity 357 of the guide sleeve 352, it can drive the mounted bearing 351 to move up and down vertically, preventing the mounted bearing 351 from tilting. The bottom wall of the guide cavity 357 of the guide sleeve 352 is provided with a through hole for the pull rod 354 to pass through, and the lower end of the pull rod 354 passes through this through hole and is fixedly connected to the stop block 356. Preferably, the stop block 356 is a nut, which is threaded onto the pull rod 354; this not only allows the nut to act as a stop, but also allows adjustment of the nut's position on the pull rod 354. The compression spring 355 is disposed within the guide cavity 357 and sleeved on the pull rod 354, with its two ends abutting against the bottom wall of the guide cavity 357 and the guide block 353, respectively, to provide spring force.

[0040] In this embodiment, when the plate 5 is stretched and straightened, the two stretching heads 2 apply opposite pulling forces to the plate 5. Under the action of this pulling force, the plate 5 presses down on the straightening roller 34. When the pressure exceeds the spring force of the compression spring 355, the straightening roller 34 contacts the support roller 372 of the support roller device 37 and is supported by the support roller 372. At this time, the top of all the straightening rollers 34 are at the same height to form a straightening rolling plane. The center of the plate 5 supported by the straightening rolling plane coincides with the center of the stretching machine. In this way, the width deformation of the plate 5 is straightened by the transverse straightening roller device 3. After the sheet 5 is stretched and straightened, the fixed stretching head 2 releases the sheet 5, and the moving stretching head 2 drives the sheet 5 to move on the straightening roller 34. At this time, the force exerted by the sheet 5 on the straightening roller 34 is less than the spring force of the compression spring 355. Under the action of the compression spring 355, the straightening roller 34 and the support roller 372 of the support roller device 37 are separated. This reduces the friction when the straightening roller 34 rotates, so that the sheet 5 can still drive the straightening roller 34 to rotate during the movement, preventing the sheet 5 and the straightening roller 34 from sliding against each other and avoiding damage to the surface of the sheet 5.

[0041] See Figure 2 , Figure 3 The stretching machine provided in this embodiment of the invention has a guide device 38 between the straightening frame 33 and the base 31; the guide device 38 includes a vertically arranged guide shaft 381 and a sliding sleeve 382 sleeved on the guide shaft 381 and slidingly engaged with it; the guide shaft 381 and the sliding sleeve 382 are respectively fixedly connected to one of the straightening frame 33 and the base 31.

[0042] The stretching machine provided in this embodiment of the invention includes a guide device 38 for guiding the straightening frame 33 during lifting and lowering, ensuring that the straightening frame 33 moves vertically. In this embodiment, the guide shaft 381 is fixedly connected to the straightening frame 33, and the sliding sleeve 382 is fixedly connected to the base 31. In other embodiments, the guide shaft 381 is fixedly connected to the base 31, and the sliding sleeve 382 is fixedly connected to the straightening frame 33.

[0043] See Figure 2 , Figure 3 The stretching machine provided in this embodiment of the invention includes two sets of synchronization devices 39 disposed between the straightening frame 33 and the base 31; the two sets of synchronization devices 39 are arranged at intervals along the stretching direction 4 of the sheet metal; each synchronization device 39 includes a horizontally arranged synchronization shaft 391 rotatably connected to the base 31, gears 392 fixed at both ends of the synchronization shaft 391, and racks 393 fixed on the straightening frame 33 and meshing with each gear 392. The synchronization shaft 391 is arranged parallel to the straightening roller 34, and the synchronization shaft 391 is connected to the base 31 through two bearings so that the synchronization shaft 391 can rotate around its own axis.

[0044] In the stretching machine provided in this embodiment of the invention, when the lifting mechanism 32 drives the straightening frame 33 to move up and down, the straightening frame 33 drives the synchronous shaft 391 to move up and down. The synchronous shaft 391 drives the gear 392 to roll on the rack 393 that meshes with it. In this way, under the action of the two sets of synchronous devices 39, it is ensured that the various positions of the straightening frame 33 move up and down synchronously, avoiding the straightening frame 33 from tilting during the up and down movement, and improving the reliability of the entire device.

[0045] See Figure 2 , Figure 3 The stretching machine provided in this embodiment of the invention includes a lifting mechanism 32 comprising at least one vertically arranged hydraulic cylinder; the cylinder body of the hydraulic cylinder is connected to the base 31, and the piston rod of the hydraulic cylinder is connected to the straightening frame 33. Of course, in other embodiments, the lifting mechanism 32 may also be a cylinder or other linear drive mechanism.

[0046] The lifting mechanism 32 can be one hydraulic cylinder, or two or more hydraulic cylinders. In this embodiment, when the transverse straightening roller device 3 is a two-roll device, the lifting mechanism 32 includes two hydraulic cylinders; when the transverse straightening roller device 3 is a three-roll device, a four-roll device, or a five-roll device, the lifting mechanism 32 includes four hydraulic cylinders.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A drawing machine comprising a track (1) and two drawing heads (2) arranged on the track (1); characterized in that, At least one set of transverse straightening rollers (3) covering the stretching length of the plate are installed on the track (1) and between the two stretching heads (2). The transverse straightening roller device (3) includes a base (31) mounted on a track (1), a straightening frame (33) mounted above the base (31) via a lifting mechanism (32), and at least two straightening rollers (34) evenly spaced above the straightening frame (33) along the plate stretching direction (4); the straightening rollers (34) are arranged perpendicular to the plate stretching direction, and their two ends are rotatably connected to the straightening frame (33) via roller seats (35); The straightening frame (33) is equipped with at least one set of support roller devices (37) located below the straightening rollers (34) and used to support each straightening roller (34). The roller seat (35) includes a seated bearing (351), a guide sleeve (352), a guide block (353), a pull rod (354), a compression spring (355), and a stop block (356). The seated bearing (351) is mounted on the straightening roller (34); the guide sleeve (352) is located below the seated bearing (351) and is fixedly connected to the straightening frame (33); the guide sleeve (352) has a vertically arranged guide cavity (357) with an open top; the guide block (353) is slidably fitted in the guide cavity (357) and is fixedly connected to the seated bearing (351); The pull rod (354) is disposed in the guide cavity (357), its upper end is fixedly connected to the guide block (353), and its lower end passes through the bottom wall of the guide cavity (357) and is fixedly connected to the stop block (356) disposed below the guide sleeve (352); the compression spring (355) is disposed in the guide cavity (357) and sleeved on the pull rod (354); When the stop block (356) abuts against the bottom of the guide sleeve (352) under the action of the compression spring (355), the straightening roller (34) separates from the support roller device (37).

2. The stretching machine according to claim 1, characterized in that, The straightening frame (33) has vertically arranged positioning plates (36) fixed at both ends along the stretching direction (4) of the plate; the distance between the outer surface of the positioning plate (36) and the center line of the nearest straightening roller (34) is equal to half the distance between the center lines of two adjacent straightening rollers (34).

3. The stretching machine according to claim 2, characterized in that, The transverse straightening roller device (3) includes at least two sets; the outer surfaces of the positioning plates (36) in adjacent transverse straightening roller devices (3) are attached together.

4. The stretching machine according to claim 1, characterized in that, The support roller device (37) includes a support frame (371) mounted on the straightening frame (33) and two support rollers (372) mounted on the support frame (371) and symmetrically arranged on both sides of the straightening roller (34).

5. The stretching machine according to claim 1, 2 or 3, characterized in that, A guide device (38) is provided between the straightening frame (33) and the base (31); The guiding device (38) includes a vertically arranged guide shaft (381) and a sliding sleeve (382) sleeved on the guide shaft (381) and slidingly engaged with it; the guide shaft (381) and the sliding sleeve (382) are respectively fixedly connected to one of the straightening frame (33) and the base (31).

6. The stretching machine according to claim 1, 2 or 3, characterized in that, Two sets of synchronization devices (39) are provided between the straightening frame (33) and the base (31); the two sets of synchronization devices (39) are arranged at intervals along the stretching direction (4) of the plate. The synchronization device (39) includes a horizontally arranged synchronization shaft (391) rotatably connected to the base (31), gears (392) fixed at both ends of the synchronization shaft (391), and racks (393) fixed on the straightening frame (33) and meshing with each gear (392).

7. The stretching machine according to claim 6, characterized in that, The lifting mechanism (32) includes at least one vertically arranged hydraulic cylinder; the cylinder body of the hydraulic cylinder is connected to the base (31), and the piston rod of the hydraulic cylinder is connected to the straightening frame (33).

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