Thin-walled profile frame roll bending forming device

Abstract

The utility model provides a kind of thin-walled section frame roll bending forming device, including base frame, main roll bending component, adjusting assembly, front roll bending component and rear roll bending component, main roll bending component is arranged in base frame, main roll bending component is used to drive thin-walled section frame linear displacement, the side of base frame is provided adjusting assembly, and adjusting assembly is located below main roll bending component, adjusting assembly can be close to or away from main roll bending component, front roll bending component and rear roll bending component are respectively provided in the two sides of adjusting assembly.The thin-walled section frame roll bending forming device described in the utility model, by setting by setting multiple driven roller shafts with first positioning protrusion and second positioning protrusion position limit to thin-walled section frame, to solve the problem that the size deviation of profile frame after forming is relatively large due to lack of effective positioning structure in traditional roll bending device, cannot meet high-precision requirement, leading to waste manpower and material resources and increase production cost.

Description

Technical Field

[0001] This utility model belongs to the field of metal processing, and in particular relates to a thin-walled profile frame roll forming device. Background Technology

[0002] Roll bending equipment is an important piece of equipment in the field of metal plastic forming. It is mainly used to continuously and progressively bend metal sheets, profiles, or tubes into the desired cross-sectional shape using multiple pairs of forming rollers. Compared with traditional stamping bending, bending machine bending, and stretch bending, roll bending has advantages such as high production efficiency, wide range of applicable materials, high forming accuracy, and flexible processes. With the increasing demand for long-length, high-precision, and complex cross-section metal components in industries such as automotive, construction, rail transportation, and aerospace, as well as the widespread application of high-strength alloy materials, roll bending technology has developed rapidly.

[0003] In rocket body structures, thin-walled profile frames (such as aluminum alloy thin-walled profile frames) are crucial load-bearing components used to maintain the rocket's external dimensions and connect its various structural sections. These profile frames typically require roll bending forming to create specific ring or arc-shaped structures. The forming accuracy directly impacts the rocket's assembly precision and overall mechanical properties. However, traditional roll bending devices lack effective positioning structures, resulting in significant dimensional deviations in the formed profile frames, failing to meet high-precision requirements and leading to wasted manpower, resources, and increased production costs. Utility Model Content

[0004] In view of this, the present invention aims to propose a thin-walled profile frame roll bending forming device to solve the problem that traditional roll bending devices lack an effective positioning structure, resulting in large dimensional deviations of the formed profile frame, failing to meet high precision requirements, and thus wasting manpower and resources and increasing production costs.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A thin-walled profile frame roll bending forming device includes a base frame, a main roll bending assembly, an adjusting assembly, a front roll bending assembly, and a rear roll bending assembly. The main roll bending assembly is installed inside the base frame and is used to drive the thin-walled profile frame to linear displacement. An adjusting assembly is installed on one side of the base frame and is located below the main roll bending assembly. The adjusting assembly can move closer to or further away from the main roll bending assembly. The front roll bending assembly and the rear roll bending assembly are respectively installed on both sides of the adjusting assembly and are arranged along the displacement direction of the thin-walled profile frame.

[0007] Furthermore, according to one embodiment of the present invention, the base frame includes a frame body and a first support. The frame body is set on the production line, and the first support is fixedly installed on the upper end of the frame body. One end of the first support is rotatably connected to the outer periphery of one end of the main rolling bending assembly. A first sliding groove is provided on one side of the frame body, and the inner wall of the first sliding groove is slidably connected to the outer periphery of one side of the adjustment assembly. The first sliding groove is used to limit the displacement trajectory of the adjustment assembly.

[0008] Furthermore, the main roll bending assembly includes a first rotating motor and a drive roller. The first rotating motor is fixedly installed in the frame body, and the output shaft of the first rotating motor is rotatably connected to one side of the frame body. The output shaft of the first rotating motor is fixedly connected to one end of the drive roller, and the other end of the drive roller is rotatably connected to one end of the first bracket. The first rotating motor is used to drive the drive roller to rotate.

[0009] Furthermore, the adjustment assembly includes a first housing, a first hydraulic cylinder, a first platform, and a first driven roller shaft. The first housing is fixedly installed on the production line and is located on one side of the frame. The first hydraulic cylinder is fixedly installed inside the first housing, and the movable end of the first hydraulic cylinder is fixedly connected to the lower end of the first platform. The first hydraulic cylinder is used to drive the first platform to move linearly. A first slider is provided on one side of the first platform, and the periphery of the first slider is slidably connected in a first groove. Two second supports are fixedly installed on the upper end of the first platform, and the two second supports are parallel. A first driven roller shaft is provided between the two second supports, and the periphery of the two ends of the first driven roller shaft is rotatably connected to one end of a second support.

[0010] Furthermore, a first positioning protrusion and a second positioning protrusion are respectively provided at both ends of the first driven roller shaft, and the inner sidewalls of the first positioning protrusion and the second positioning protrusion are respectively located at the outer periphery of both ends of the driving roller shaft. The first positioning protrusion and the second positioning protrusion are used to define the relative position of the thin-walled profile frame.

[0011] Furthermore, the front roll bending assembly and the rear roll bending assembly have the same structure and are arranged opposite each other. The front roll bending assembly includes a second housing, a second hydraulic cylinder, a second platform, a second rotary motor, and a drive gear. The second housing is fixedly installed on the production line and is located on one side of the adjustment assembly. The second hydraulic cylinder is fixedly installed inside the second housing, and the movable end of the second hydraulic cylinder is fixedly connected to the lower end of the second platform. The outer periphery of the second platform is slidably connected to the inner wall of the second housing. The upper end of the second platform is provided with a second sliding groove, and the second platform is provided with a through groove, which is located on one side of the second sliding groove. The second rotary motor is fixedly installed at the lower end of the second platform and is located on one side of the second hydraulic cylinder. The output shaft of the second rotary motor is fixedly connected to the middle of one side of the drive gear, and the outer periphery of one side of the drive gear passes through the through groove and is located on the outer periphery of the upper end of the second platform.

[0012] Furthermore, the forward roll bending assembly also includes a mounting plate and a second driven roller shaft. A second slider is provided at the lower end of the mounting plate, and the outer periphery of the second slider is slidably connected to the inner wall of the second slide groove. Two third brackets are fixedly mounted at the upper end of the mounting plate, and the two third brackets are parallel to each other. A second driven roller shaft is provided between the two third brackets, and the outer peripheries of the two ends of the second driven roller shaft are respectively rotatably connected to one end of a third bracket. The second driven roller shaft has the same structure as the first driven roller shaft and is located on one side of the first driven roller shaft. A rack is also provided at the lower end of the mounting plate, and the rack is located above the through groove. One outer periphery of the rack meshes with one outer periphery of the drive gear.

[0013] Compared with the prior art, the thin-walled profile frame roll forming device of this utility model has the following advantages:

[0014] (1) The thin-walled profile frame roll forming device of the present invention can limit the position of the thin-walled profile frame during the roll bending process by setting multiple driven rollers with first positioning protrusions and second positioning protrusions, so as to prevent the displacement of the thin-walled profile frame during the roll bending process from causing deviation in the roll bending size, or the rollers from damaging the surface of the thin-walled profile frame during the roll bending process, thereby improving product quality.

[0015] (2) The thin-walled profile frame roll forming device of the present invention can drive the second driven roller shaft to approach or move away from the first driven roller shaft by setting a rack that matches the driving gear, thereby realizing the adjustment of the roll bending size of the thin-walled profile frame. Attached Figure Description

[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the thin-walled profile frame roll forming device described in this embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the base frame structure described in an embodiment of the present utility model;

[0019] Figure 3 This is a cross-sectional structural diagram of the assembly of the base frame and the main roll bending assembly according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the adjustment component described in an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the front roll bending assembly described in an embodiment of the present utility model;

[0022] Figure 6 This is an exploded view of the assembly structure of the second platform, the second rotating motor, the drive gear, and the mounting plate in an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Base frame; 11-Frame body; 12-First support; 13-First chute; 2-Main roll bending assembly; 21-First rotating motor; 22-Driven roller shaft; 3-Adjusting assembly; 31-First outer shell; 32-First hydraulic cylinder; 33-First platform; 331-First slider; 332-Second support; 34-First driven roller shaft; 341-First positioning protrusion; 342-Second positioning protrusion; 4-Front roll bending assembly; 41-Second outer shell; 42-Second hydraulic cylinder; 43-Second platform; 431-Second chute; 432-Through groove; 44-Second rotating motor; 45-Driven gear; 46-Mounting plate; 461-Second slider; 462-Third support; 463-Rack; 47-Second driven roller shaft; 5-Rear roll bending assembly. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 As shown, the thin-walled profile frame roll bending forming device includes a base frame 1, a main roll bending assembly 2, an adjusting assembly 3, a front roll bending assembly 4, and a rear roll bending assembly 5. The main roll bending assembly 2 is installed inside the base frame 1 and is used to drive the thin-walled profile frame to linear displacement. The adjusting assembly 3 is installed on one side of the base frame 1 and is located below the main roll bending assembly 2. The adjusting assembly 3 can move closer to or further away from the main roll bending assembly 2. The front roll bending assembly 4 and the rear roll bending assembly 5 are respectively installed on both sides of the adjusting assembly 3 and are arranged along the displacement direction of the thin-walled profile frame. By setting the front roll bending assembly 4 and the rear roll bending assembly 5, the thin-walled profile frame can be rolled. At the same time, the front roll bending assembly 4 and the rear roll bending assembly 5 can roll the thin-walled profile frame simultaneously or individually. When rolling individually, the other roll bending assembly provides displacement limit for the thin-walled profile frame to prevent the displacement path from deviating and causing the rolling dimension deviation of the thin-walled profile frame, resulting in a waste of manpower and material resources.

[0030] like Figure 2 As shown, the base frame 1 includes a frame body 11 and a first support 12. The frame body 11 is set on the production line, and the first support 12 is fixedly installed on the upper end of the frame body 11. One end of the first support 12 is rotatably connected to the outer periphery of one end of the main rolling bending assembly 2. A first sliding groove 13 is provided on one side of the frame body 11, and the inner wall of the first sliding groove 13 is slidably connected to the outer periphery of one side of the adjusting assembly 3. The first sliding groove 13 is used to limit the displacement trajectory of the adjusting assembly 3. The first sliding groove 13 can limit the displacement direction of the adjusting assembly 3 and prevent the displacement deviation of the adjusting assembly 3 from causing the rolling bending dimension deviation of the thin-walled profile frame.

[0031] like Figure 3 As shown, the main roll bending assembly 2 includes a first rotating motor 21 and a drive roller 22. The first rotating motor 21 is fixedly installed inside the frame 11, and the output shaft of the first rotating motor 21 is rotatably connected to one side of the frame 11. The output shaft of the first rotating motor 21 is fixedly connected to one end of the drive roller 22, and the other end of the drive roller 22 is rotatably connected to one end of the first bracket 12. The first rotating motor 21 is used to drive the drive roller 22 to rotate. By driving the drive roller 22 to rotate, during roll bending, one side of the drive roller 22 is rolled and connected to one side of the thin-walled profile frame. The drive roller 22 drives the thin-walled profile frame to perform linear displacement. At the same time, the rotation speed of the first rotating motor 21 can be adjusted according to the roll bending requirements to prevent the rotation speed from being too fast and causing safety hazards or deviations during the roll bending of the thin-walled profile frame. The first rotating motor 21 is existing technology, model Z4-112. This motor can rotate in both directions and can repeatedly roll bend the thin-walled profile frame.

[0032] like Figure 4 As shown, the adjustment component 3 includes a first housing 31, a first hydraulic cylinder 32, a first platform 33, and a first driven roller 34. The first housing 31 is fixedly installed on the production line and is located on one side of the frame 11. The first hydraulic cylinder 32 is fixedly installed inside the first housing 31, and the movable end of the first hydraulic cylinder 32 is fixedly connected to the lower end of the first platform 33. The first hydraulic cylinder 32 is used to drive the first platform 33 to move linearly. A first slider 331 is provided on one side of the first platform 33, and the periphery of the first slider 331 is slidably connected in the first slide groove 13. By setting the first slider 331, the displacement trajectory of the first platform 33 is limited to prevent the first platform 33 from deviating during the rising and falling process, which could cause production safety hazards. The first hydraulic cylinder 32 is existing technology, model CJT140-CB32B100B.

[0033] Two second supports 332 are fixedly installed on the upper end of the first platform 33, and the two second supports 332 are parallel. A first driven roller shaft 34 is arranged between the two second supports 332, and the outer peripheries of the two ends of the first driven roller shaft 34 are respectively rotatably connected to one end of a second support 332. A first positioning protrusion 341 and a second positioning protrusion 342 are respectively arranged at the two ends of the first driven roller shaft 34, and the inner sidewalls of the first positioning protrusion 341 and the second positioning protrusion 342 are respectively located on the outer periphery of the two ends of the driving roller shaft 22. The first positioning protrusion 341 and the second positioning protrusion 342 are used to limit the relative position of the thin-walled profile frame. By setting the first positioning protrusion 341 and the second positioning protrusion 342, the position of the thin-walled profile frame on the first driven roller shaft 34 is restricted, preventing the thin-walled profile frame from shifting and falling off the first driven roller shaft 34, causing bending dimension deviation or safety hazards.

[0034] like Figure 5-6As shown, the front roll bending assembly 4 and the rear roll bending assembly 5 have the same structure and are arranged opposite each other. The front roll bending assembly 4 includes a second housing 41, a second hydraulic cylinder 42, a second platform 43, a second rotary motor 44, and a drive gear 45. The second housing 41 is fixedly installed on the production line and is located on one side of the adjustment assembly 3. The second hydraulic cylinder 42 is fixedly installed inside the second housing 41, and the movable end of the second hydraulic cylinder 42 is fixedly connected to the lower end of the second platform 43. The outer periphery of the second platform 43 is slidably connected to the inner wall of the second housing 41. The upper end of the second platform 43 is provided with a second slide groove 431, and the second platform 43 is provided with a through groove 432, which is located on one side of the second slide groove 431; the second hydraulic cylinder 42 is prior art, model CJT140-CB32B100B, and the second rotary motor 44 is prior art, model Z4-112. This motor can rotate forward and reverse, and further drives the second driven roller shaft 47 to move closer to or away from the first driven roller shaft 34 through the drive gear 45 to achieve the size adjustment of the thin-walled profile frame.

[0035] The second rotary motor 44 is fixedly installed at the lower end of the second platform 43, and is located on one side of the second hydraulic cylinder 42. The output shaft of the second rotary motor 44 is fixedly connected to the middle of one side of the drive gear 45, and the outer periphery of one side of the drive gear 45 passes through the through groove 432 and is located on the upper periphery of the second platform 43. The front rolling bending assembly 4 also includes a mounting plate 46 and a second driven roller shaft 47. The lower end of the mounting plate 46 is provided with a second slider 461, and the outer periphery of the second slider 461 is slidably connected to the inner wall of the second slide groove 431. The upper end of the mounting plate 46 is fixedly installed with two third brackets 462, and the two third brackets 462 are parallel to each other. The second driven roller shaft 47 is provided between the two third brackets 462, and the outer peripheries of the two ends of the second driven roller shaft 47 are respectively rotatably connected. At one end of a third bracket 462, a second driven roller shaft 47 has the same structure as the first driven roller shaft 34 and is located on one side of the first driven roller shaft 34; a rack 463 is also provided at the lower end of the mounting plate 46, and the rack 463 is located above the through groove 432. One side of the outer periphery of the rack 463 meshes with one side of the outer periphery of the drive gear 45. The second slider 461 under the mounting plate 46 is slidably connected in the second slide groove 431 to limit the displacement direction of the mounting plate 46. By setting a second rotating motor 44 to drive the drive gear 45 to rotate, one side of the outer periphery of the drive gear 45 meshes with one side of the outer periphery of the rack 463, further driving the mounting plate 46 to slide, further moving the second driven roller shaft 47 away from or closer to the first driven roller shaft 34, thereby realizing the adjustment of the bending degree of the thin-walled profile frame.

[0036] Working process of thin-walled profile frame roll forming device:

[0037] During operation, the thin-walled profile frame is first placed between the active roller 22 of the main rolling bending assembly 2 and the first driven roller 34 of the adjusting assembly 3. The relative position of the thin-walled profile frame is defined by the first positioning protrusion 341 and the second positioning protrusion 342 at both ends of the first driven roller 34. Subsequently, the first rotating motor 21 in the main rolling bending assembly 2 starts, driving the active roller 22 to rotate, thereby causing the thin-walled profile frame to move linearly along the displacement direction. At the same time, the first hydraulic cylinder 32 in the adjusting assembly 3 pushes the first platform 33 to move along the first slide groove 13 on the frame 11 of the base frame 1, so that the first driven roller 34 moves closer to or further away from the active roller 22 to adjust the pressure on the thin-walled profile frame. When the thin-walled profile frame moves to the area of ​​the front rolling bending assembly 4, the front rolling bending assembly 4... The second hydraulic cylinder 42 pushes the second platform 43 to move along the inner wall of the second outer shell 41, adjusting the height of the second driven roller shaft 47. At the same time, the second rotating motor 44 drives the drive gear 45 to rotate. The drive gear 45 meshes with the rack 463 at the lower end of the mounting plate 46, causing the mounting plate 46 to slide along the second slide groove 431 of the second platform 43, further adjusting the lateral position of the second driven roller shaft 47. This allows the second driven roller shaft 47 to cooperate with the drive roller shaft 22 to perform roll bending on the thin-walled profile frame. Similarly, when the thin-walled profile frame continues to move to the area of ​​the rear roll bending assembly 5, the rear roll bending assembly 5, which has the same structure as the front roll bending assembly 4, performs subsequent roll bending forming on the thin-walled profile frame in the same way, finally completing the overall roll bending forming of the thin-walled profile frame.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thin-walled profile frame roll forming device, characterized in that: It includes a base frame (1), a main roll bending assembly (2), an adjustment assembly (3), a front roll bending assembly (4), and a rear roll bending assembly (5). The main roll bending assembly (2) is installed inside the base frame (1). The main roll bending assembly (2) is used to drive the linear displacement of the thin-walled profile frame. The adjustment assembly (3) is installed on one side of the base frame (1) and is located below the main roll bending assembly (2). The adjustment assembly (3) can move closer to or further away from the main roll bending assembly (2). The front roll bending assembly (4) and the rear roll bending assembly (5) are installed on both sides of the adjustment assembly (3) respectively. The front roll bending assembly (4) and the rear roll bending assembly (5) are arranged along the displacement direction of the thin-walled profile frame.

2. The thin-walled profile frame roll forming device according to claim 1, characterized in that: The base frame (1) includes a frame body (11) and a first support (12). The frame body (11) is set on the production line. The first support (12) is fixedly installed on the upper end of the frame body (11). One end of the first support (12) is rotatably connected to the outer periphery of one end of the main rolling bending assembly (2). A first sliding groove (13) is provided on one side of the frame body (11). The inner wall of the first sliding groove (13) is slidably connected to the outer periphery of one side of the adjustment assembly (3). The first sliding groove (13) is used to limit the displacement trajectory of the adjustment assembly (3).

3. The thin-walled profile frame roll forming device according to claim 2, characterized in that: The main roll bending assembly (2) includes a first rotating motor (21) and an active roller (22). The first rotating motor (21) is fixedly installed inside the frame (11), and the output shaft of the first rotating motor (21) is rotatably connected to one side of the frame (11). The output shaft of the first rotating motor (21) is fixedly connected to one end of the active roller (22), and the other end of the active roller (22) is rotatably connected to one end of the first bracket (12). The first rotating motor (21) is used to drive the active roller (22) to rotate.

4. The thin-walled profile frame roll forming device according to claim 2, characterized in that: The adjustment assembly (3) includes a first housing (31), a first hydraulic cylinder (32), a first platform (33), and a first driven roller (34). The first housing (31) is fixedly installed on the production line and is located on one side of the frame (11). The first hydraulic cylinder (32) is fixedly installed inside the first housing (31), and the movable end of the first hydraulic cylinder (32) is fixedly connected to the lower end of the first platform (33). The first hydraulic cylinder (32) is used to drive the first platform (33) to linearly move. A first slider (331) is provided on one side of the first platform (33), and the periphery of the first slider (331) is slidably connected in the first slide groove (13). Two second supports (332) are fixedly installed on the upper end of the first platform (33), and the two second supports (332) are parallel. A first driven roller shaft (34) is provided between the two second supports (332), and the outer periphery of the two ends of the first driven roller shaft (34) is rotatably connected to one end of a second support (332).

5. The thin-walled profile frame roll forming device according to claim 3, characterized in that: The first driven roller shaft (34) is provided with a first positioning protrusion (341) and a second positioning protrusion (342) at both ends, and the inner walls of the first positioning protrusion (341) and the second positioning protrusion (342) are located at the outer periphery of both ends of the driving roller shaft (22). The first positioning protrusion (341) and the second positioning protrusion (342) are used to define the relative position of the thin-walled profile frame.

6. The thin-walled profile frame roll forming device according to claim 1, characterized in that: The front roll bending assembly (4) and the rear roll bending assembly (5) have the same structure and are arranged opposite each other. The front roll bending assembly (4) includes a second housing (41), a second hydraulic cylinder (42), a second platform (43), a second rotating motor (44), and a drive gear (45). The second housing (41) is fixedly installed on the production line and is located on one side of the adjustment assembly (3). The second hydraulic cylinder (42) is fixedly installed inside the second housing (41), and the movable end of the second hydraulic cylinder (42) is fixedly connected to the lower end of the second platform (43). The periphery of the second platform (43) is slidably connected to the inner wall of the second housing (41). The upper end of the second platform (43) is provided with a second slide groove (431), and the second platform (43) is provided with a through groove (432), which is located on one side of the second slide groove (431). The second rotating motor (44) is fixedly installed at the lower end of the second platform (43), and the second rotating motor (44) is located on one side of the second hydraulic cylinder (42). The output shaft of the second rotating motor (44) is fixedly connected to the middle of one side of the drive gear (45), and the outer periphery of one side of the drive gear (45) passes through the through groove (432) and is located on the upper periphery of the second platform (43).

7. The thin-walled profile frame roll forming device according to claim 6, characterized in that: The front roll bending assembly (4) also includes a mounting plate (46) and a second driven roller shaft (47). The lower end of the mounting plate (46) is provided with a second slider (461), and the outer periphery of the second slider (461) is slidably connected to the inner wall of the second slide groove (431). The upper end of the mounting plate (46) is fixedly installed with two third supports (462), and the two third supports (462) are parallel to each other. The second driven roller shaft (47) is provided between the two third supports (462), and the outer periphery of the two ends of the second driven roller shaft (47) is rotatably connected to one end of a third support (462). The second driven roller shaft (47) has the same structure as the first driven roller shaft (34) and is located on one side of the first driven roller shaft (34); The lower end of the mounting plate (46) is also provided with a rack (463), and the rack (463) is located above the through groove (432), with one side of the rack (463) meshing with one side of the drive gear (45).

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