Bending forming equipment for aluminum alloy straight-wall square pipe body

Abstract

The invention relates to the technical field of bending equipment, in particular to aluminum alloy straight-wall square pipe body bending forming equipment which comprises an extrusion wheel used for actively extruding a square pipe, two top wheels used for blocking the square pipe and a filling body used for outwards supporting the square pipe, and the extrusion wheel and the two top wheels are distributed in a triangular shape; the inside of the square tube is externally supported by the filling body, the shape of the section of the square tube can be kept unchanged when the square tube is bent, damage to the square tube caused by defect deformation such as squaring and wrinkling when the square tube is bent is avoided, the machining quality of the square tube is improved, meanwhile, the inner corner of the square tube is accurately supported by the multiple supporting points on each single piece, stress is dispersed, and the machining quality of the square tube is improved. And the plane is prevented from being concave or convex.

Description

Technical Field

[0001] The present invention relates to the technical field of bending equipment, and in particular to an aluminum alloy straight-wall square tube bending and forming equipment. Background Art

[0002] With the development of modern industry, due to its advantages such as light weight, high strength, and corrosion resistance, aluminum alloy materials have been widely used in many fields such as aerospace, automobile manufacturing, and architectural decoration. Especially in the manufacture of structural parts, aluminum alloy straight-wall square tubes have become one of the preferred materials in many applications due to their excellent mechanical properties and aesthetics. For example, in the automotive field, it can be used to make body frames, chassis, battery pack brackets, etc.; in the construction field, it can be used to make stair handrails, display frames, partition keels, etc.; in the home furnishing field, it can be used to make storage racks, screen frames, etc.

[0003] When processing aluminum alloy straight-wall square tubes, it is generally necessary to bend them into a certain arc to facilitate forming the square tubes into a specified shape. When bending, a rolling wheel is commonly used to directly roll and bend the square tube. Since the square tube is hollow inside, when the square tube is subjected to extrusion force, the two non-loaded surfaces are prone to deform inwards or outwards, that is, the cross-sectional shape of the square tube changes, resulting in damage to the square tube being crushed. Summary of the Invention

[0004] The present invention provides an aluminum alloy straight-wall square tube bending and forming equipment, which can effectively solve the problems in the background art.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: An aluminum alloy straight-wall square tube bending and forming equipment includes an extrusion wheel for actively extruding the square tube, two top wheels for blocking the square tube, and a filling body for externally supporting the square tube, and the extrusion wheel and the two top wheels are distributed in a triangle. The filling body includes a plurality of single pieces arranged in a straight line, a plurality of external support bodies provided on each single piece, and a flexible connecting member connecting adjacent two single pieces, and the external support bodies are used to support the inner corners of the square tube.

[0006] In some embodiments of the present invention, a plurality of inner grooves are formed in the single piece, and the plurality of inner grooves communicate with each other. An activity rod is slidably arranged in each inner groove, and the activity rod is connected to the external support body. The flexible connecting member is a hose and is communicated with the intersection point of each inner groove, and adjacent two single pieces are communicated through the flexible connecting member.

[0007] In some embodiments of the present invention, the external support body is made of one of an elastic metal material, a fiber-reinforced composite material, or a foam material.

[0008] In some embodiments of the present invention, a plurality of deformation grooves are formed on the outer support body, and the plurality of deformation grooves are arranged along the length direction of the filling body.

[0009] In some embodiments of the present invention, a plurality of auxiliary wheel bodies are disposed on the single piece, and at least within a portion of the travel of the movable rod, the auxiliary wheel bodies are located outside the outer support body.

[0010] In some embodiments of the present invention, the filling body further includes a winding roller and a conveying tube, the winding roller is used to wind up the conveying tube, and the conveying tube is connected to the flexible connecting piece at one end of the filling body.

[0011] In some embodiments of the present invention, a chain belt is provided on the two top wheels, the top wheels are movably provided along the direction of the line between the two top wheels, and the chain belt is kept in a taut state; A plurality of rubber rollers are arranged on the outer wall of the chain belt.

[0012] In some embodiments of the present invention, the two top wheels move synchronously relative to each other.

[0013] In some embodiments of the present invention, both end surfaces of the extrusion wheel are provided with ribs, and a plurality of auxiliary rollers are rotatably provided on each of the ribs, the auxiliary rollers are used to extrude the upper surface or the lower surface of the square tube, and the auxiliary rollers are in line contact with the square tube, and the contact line is horizontal.

[0014] In some embodiments of the present invention, the extrusion wheel includes a relatively distributed dividing plate 1 and a dividing plate 2, the two retaining edges are respectively arranged on the dividing plate 1 and the dividing plate 2, a rib sleeve is arranged in the middle of the dividing plate 1, a plug hole for use with the rib sleeve is opened in the middle of the dividing plate 2, and a plurality of plug ribs distributed crosswise with each other are arranged on the dividing plate 1 and the dividing plate 2 outside the rib sleeve.

[0015] The technical solution of the present invention can achieve the following technical effects: By using a filler body to support the inside of the square tube, the cross-sectional shape of the square tube can be kept unchanged when it is bent, avoiding deformation such as crushing and wrinkling when the square tube is bent, which may cause damage to the square tube and improve the processing quality of the square tube. At the same time, the inner corners of the square tube are accurately supported by several support points on each single piece to disperse the stress and avoid concave or convex planes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0017] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a schematic bottom view structure diagram of the workbench in the embodiment of the present invention; Figure 3 is a structural schematic diagram of the filling body in the embodiment of the present invention; Figure 4 is a structural schematic diagram of a single piece in the embodiment of the present invention; Figure 5 is a schematic cross-sectional structure diagram of a single piece in the embodiment of the present invention; Figure 6 is a structural schematic diagram of the top wheel in the embodiment of the present invention; Figure 7 is a structural schematic diagram of the extrusion wheel in the embodiment of the present invention; Figure 8 is an exploded structural schematic diagram of the extrusion wheel in the embodiment of the present invention.

[0018] Reference numerals: 100, extrusion wheel; 101, edge guard; 102, auxiliary roller; 103, first dividing plate; 104, second dividing plate; 105, rib sleeve; 106, inserted rib; 200, top wheel; 201, chain belt; 202, rubber roller; 300, filling body; 301, single piece; 302, outer support body; 303, flexible connecting member; 304, inner groove; 305, movable rod; 306, deformation groove; 307, auxiliary wheel body; 308, winding roller; 309, conveying pipe; 400, workbench; 401, motor; 402, oil cylinder; 403, synchronization structure. Detailed implementation manners

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] As Figures 1 to 4 shown, a bending and forming device for an aluminum alloy straight-wall square tube of the present invention includes an extrusion wheel 100 for actively extruding the square tube, two top wheels 200 for blocking the square tube, and a filling body 300 for externally supporting the square tube. The extrusion wheel 100 and the two top wheels 200 are distributed in a triangle. The filling body 300 includes a plurality of single pieces 301 arranged in a straight line, a plurality of external support bodies 302 provided on each single piece 301, and a flexible connecting member 303 connecting adjacent two single pieces 301. The external support bodies 302 are used to support the inner corners of the square tube. In the present invention, the extrusion wheel 100 and the two top wheels 200 arranged in a triangle can be installed on a horizontal plane or a vertical plane, and the extrusion wheel 100 can be located at any endpoint of the triangle. The extrusion wheel 100 is mainly used to extrude the square tube onto the two top wheels 200, so that the extrusion wheel 100 can actively extrude the square tube, while the two top wheels 200 are mainly used to block the square tube. When the extrusion wheel 100 moves towards between the two top wheels 200, the extrusion wheel 100 and the two top wheels 200 can cooperate to extrude and bend the square tube, thereby realizing the bending work of the square tube. This bending method is mainly used to bend the square tube at a certain angle; when it is necessary to bend the square tube into a specified arc, the extrusion wheel 100 or the two top wheels 200 can be in a rotating state, so that the square tube is continuously extruded by the extrusion wheel 100 during transportation, thereby deforming the square tube from a straight line into an arc; in some embodiments, at least one of the two top wheels 200 can also be moved so that the extrusion wheel 100 and the two top wheels 200 cooperate to also realize the bending work of the square tube; Since the filling body 300 can externally support the square tube, during bending, the filling body 300 can extend into the square tube and contact the inner wall of the square tube or each inner corner of the square tube. In this way, when the square tube is bent, the supporting effect of the filling body 300 on the inner side of the square tube can keep the cross-sectional shape of the square tube unchanged, that is, the square tube will not be crushed, thereby improving the bending processing quality of the square tube. The specific structure of the filling body 300 can be several single pieces 301 arranged in a straight line, or particulate matters such as fine sand. Taking several single pieces 301 as an example, each single piece 301 can serve as a support position inside the square tube. Each support position has several outer support bodies 302 as support points to support each inner corner position of the square tube. In this way, the interval setting of several support positions can generally allow the square tube to bend and deform, and effectively support the cross-sectional shape of the square tube, so that the square tube will not be crushed. Even when the acting point of the extrusion wheel 100 on the square tube is located between two adjacent single pieces 301, since the distance between two adjacent single pieces 301 is small, it can still provide effective support for the square tube. The setting of several support points on each support position can reduce the volume of the single piece 301, and only support several points at the force concentration points on the inner wall of the square tube. The number of support points is the same as the number of inner corners of the square tube, which is generally four. For the support of the inner corners, it can not only ensure that the inner corners will not deform, but also keep the plane between two adjacent inner corners flat, so as to achieve the overall support effect of the support position of the square tube. Taking particulate matters such as fine sand as an example, the fine sand can be tightly filled in the square tube in advance, and the fine sand is used to support the square tube. When the square tube is bent, the fine sand in the square tube can effectively support the cross-sectional shape of the square tube and allow the square tube to bend and deform. During actual use, the bending deformation of the square tube will cause relative movement between two adjacent single pieces 301. At this time, the flexible connecting piece 303 between two adjacent single pieces 301 will elastically bend and deform. Since the square tube is synchronously conveyed during bending and the extrusion wheel 100 gradually applies pressure to the square tube, the square tube performs a gradual deformation movement, that is, the radian of the square tube gradually reaches the specified value, while the radian of the initial bending position does not meet the requirements. It is necessary to reverse the operation of the extrusion wheel 100 so that the extrusion wheel 100 performs a rolling and bending treatment on the initial bending position again, so that the overall bending shape of the square tube meets the specified requirements. By using the filling body 300 to perform an external support treatment on the inside of the square tube, when the square tube is bent, its cross-sectional shape can be kept unchanged, avoiding defects and deformations such as crushing and wrinkling during the bending of the square tube, resulting in damage to the square tube, improving the processing quality of the square tube. At the same time, several support point outer support bodies 302 on each single piece 301 accurately support the inner corners of the square tube to disperse stress and avoid concave or convex in the plane.

[0022] Since the inner diameters of the square tubes are different, and to facilitate the smooth entry and exit of the single piece 301 into and out of the square tube, the position of the outer support body 302 on the single piece 301 can be set to be adjustable. Specifically, several inner grooves 304 are opened in the single piece 301, and several inner grooves 304 communicate with each other. A movable rod 305 is slidably arranged in each inner groove 304, and the movable rod 305 is connected to the outer support body 302. The flexible connecting piece 303 is a flexible tube and is communicated with the intersection point of each inner groove 304. Two adjacent single pieces 301 communicate with each other through the flexible connecting piece 303. As Figures 4 to 5 shown, since the inner grooves 304 inside two adjacent single pieces 301 are connected by a hose, several single pieces 301 inside the filling body 300 can be connected in sequence. When high-pressure gas is introduced into the filling body 300, the high-pressure gas will enter the inner grooves 304 inside each single piece 301, and the high-pressure gas will push the movable rods 305 inside each inner groove 304 to move, so that the movable rods 305 drive the outer support bodies 302 to move, thereby using air pressure to adjust the position of the outer support bodies 302; in some embodiments, the gas can also be replaced with a liquid such as hydraulic oil, which can also achieve the above functions; In some embodiments, to improve the sealing performance, a piston or a sealing structure can be provided at the end of the movable rod 305 inside the inner groove 304; By providing a driving force for each outer support body 302, the outer support body 302 can be adjusted in position on the single piece 301, so that several outer support bodies 302 on the single piece 301 can support square tubes of different specifications, thereby improving the applicability of the structure. At the same time, when the single piece 301 is moved into or out of the square tube, several outer support bodies 302 can be in a retracted state to reduce the occupied area. When the position of the outer support body 302 is relatively fixed with the single piece 301, after the square tube is bent, due to the deformation of the square tube, there is a large extrusion force between the inner wall of the square tube and the outer support body 302, which will cause the single piece 301 and several outer support bodies 302 thereon to be difficult to be removed from the inside of the square tube; In actual use, the specific positions of the outer support body 302, the inner groove 304 and the movable rod 305 on the single piece 301 are adjustable, that is, single pieces 301 of various specifications can be made so that the moving directions of the outer support bodies 302 are different, so as to facilitate the support of square tubes with other cross-sectional shapes such as rectangles.

[0023] Based on the above implementation, since the outer support body 302 needs to support the inner corners of the square tube, and when the square tube is bent, it will undergo bending deformation. Therefore, to avoid the outer support body 302 interfering with the acting point on the square tube and causing the acting point to be unable to deform, the outer support body 302 also needs to be able to deform, that is, the outer support body 302 is made of one of an elastic metal material, a fiber-reinforced composite material or a foam material; specifically, the elastic metal material can be spring steel, shape memory metal, beryllium copper alloy, etc.; the elastic fiber-reinforced composite material can be glass fiber or carbon fiber-reinforced elastomer, aramid fiber composite material, etc.; the elastic foam material can be aluminum foam, high-density polyurethane foam, etc.; of course, in addition to the above materials, biological materials, bionic materials, etc. can also be used.

[0024] In the above embodiments, since the outer support body 302 needs to be elastic and capable of undergoing a small amount of deformation so that the corresponding position on the square tube in contact with the outer support body 302 can allow bending deformation, a plurality of deformation grooves 306 can be provided on the outer support body 302, and the plurality of deformation grooves 306 are arranged along the length direction of the filling body 300, as Figure 4 shown. In this way, when the outer support body 302 deforms, the plurality of deformation grooves 306 thereon can be compressed to enhance the deformation allowance effect of the outer support body 302. At this time, the outer support body 302 can not only provide an outer support effect on the inner angle of the square tube, but also allow the support point to undergo bending deformation, thereby further improving the smoothness of the square tube during bending.

[0025] Optimized based on the above implementation, as Figure 4 shown, a plurality of auxiliary wheel bodies 307 are provided on the single piece 301, and at least within a partial stroke of the movement of the movable rod 305, the auxiliary wheel bodies 307 are located outside the outer support body 302; When the single piece 301 is moved into or out of the square tube, the plurality of outer support bodies 302 are in a retracted state on the single piece 301. If the outer support body 302 directly contacts the inner wall of the square tube, then friction will be generated between the outer support body 302 and the square tube, and the outer support body 302 is easily damaged by friction, and noise pollution will be generated between the outer support body 302 and the square tube. When the outer support body 302 is moved into the square tube, the friction will affect the normal movement of the filling body 300. By providing the auxiliary wheel bodies 307, the rolling movement of the auxiliary wheel bodies 307 on the inner wall of the square tube can be utilized, thereby improving the smoothness of the movement of the filling body 300; in order to prevent the outer support body 302 from blocking the auxiliary wheel bodies 307 and causing the auxiliary wheel bodies 307 to be unable to contact the inner wall of the square tube, when the plurality of outer support bodies 302 are retracted, the auxiliary wheel bodies 307 should protrude from the coverage range of the outer support body 302, that is, within a partial stroke of the movement of the movable rod 305, the auxiliary wheel bodies 307 are located outside the outer support body 302. When the outer support body 302 is in the working state, the outer support body 302 is located outside the auxiliary wheel bodies 307, and at this time, the auxiliary wheel bodies 307 are in a separated state from the inner wall of the square tube.

[0026] Based on the above implementation, the filling body 300 further includes a winding roller 308 and a delivery pipe 309. The winding roller 308 is used to wind the delivery pipe 309, and the delivery pipe 309 is communicated with the flexible connector 303 at one end of the filling body 300. By providing the delivery pipe 309, gas or oil can be supplied into the filling body 300. Since the filling body 300 needs to be inserted into the square pipe and the filling body 300 needs to deform and move synchronously when the square pipe deforms, it is necessary to use the delivery pipe 309 to achieve a state of continuous connection with the filling body 300. In the natural state, the delivery pipe 309 can be wound up by the winding roller 308 to prevent the delivery pipe 309 from being randomly scattered. Of course, a spring or other elastic body can be used on the winding roller 308 to provide a reset elastic force for the winding roller 308, or a motor or other structure can be used to realize the winding movement of the winding roller 308.

[0027] Optimized based on the above implementation, as Figure 6 shown, a chain belt 201 is provided on the two top wheels 200. The top wheels 200 are movably arranged along the direction of the line connecting the two top wheels 200, and the chain belt 201 is kept in a taut state. A number of rubber rollers 202 are provided on the outer wall of the chain belt 201. In the present invention, the way of using the chain belt 201 to contact the square pipe can make the acting force of the two top wheels 200 on the square pipe be an extrusion and pushing action in the form of surface contact, rather than the line contact form between the top wheels 200 and the square pipe in the traditional way. In this way, the force on the square pipe can be more uniform, and the square pipe in the deformed state between the two top wheels 200 can deform smoothly, avoiding the inconsistent deformation amounts at different positions of the square pipe due to the relatively concentrated force when the pressing wheel 100 and the two top wheels 200 directly extrude the square pipe in a three-point manner. The number of rubber rollers 202 provided on the chain belt 201 can achieve the conveying effect on the square pipe only by the rotation of the rubber rollers 202 when the two top wheels 200 stop rotating. That is, the above structural method can realize the conveying of the square pipe by using the chain belt 201 when the two top wheels 200 rotate, and can also realize the conveying of the square pipe by using a number of rubber rollers 202 on the chain belt 201 when the two top wheels 200 are stationary. Therefore, multiple conveying methods can be selected. It should be noted that since the square pipe will squeeze the chain belt 201 and cause the chain belt 201 to deform when it is bent and deformed, the distance between the two top wheels 200 will change. That is, the top wheels 200 need to be movably arranged, and at the same time, the chain belt 201 needs to be kept in a taut state, and this state can be achieved by applying a force to each chain belt 201.

[0028] Based on the above embodiments, when the two top wheels 200 move relative to each other, in order to make the distances between the pressing wheel 100 and each top wheel 200 equal and avoid the distance between the pressing wheel 100 and one top wheel 200 being too close, it is necessary to limit the movement forms of the two top wheels 200, that is, the two top wheels 200 move relatively synchronously; in this way, the deformation amounts of the chain belts 201 between the pressing wheel 100 and each top wheel 200 can be kept consistent.

[0029] Optimized based on the above implementation, as Figure 7 shown, on both end faces of the pressing wheel 100, there are provided edge guards 101, and several auxiliary rollers 102 are rotatably arranged on each edge guard 101. The auxiliary rollers 102 are used to press the upper surface or the lower surface of the square tube, and the auxiliary rollers 102 are in line contact with the square tube, and the contact line is horizontal; In the present invention, taking the triangle formed by the pressing wheel 100 and the two top wheels 200 on the horizontal plane as an example, by providing the two edge guards 101 and several auxiliary rollers 102 on each edge guard 101, the upper and lower surfaces of the square tube can be pressed and contacted. Cooperating with the pressing contact of the pressing wheel 100 and the chain belt 201 on the left and right sides of the square tube, the limitation of the four surfaces of the square tube can be realized, and the outward convex deformation of each surface of the square tube can be avoided; by providing the auxiliary rollers 102, when the square tube is bent, the relative movement between the square tube and the edge guard 101 will not generate friction, that is, there will be no wear between the square tube and the pressing wheel 100, thus facilitating the protection of the square tube and the equipment; since the upper and lower surfaces of the square tube are both horizontal, it is necessary to make the contact line between the auxiliary rollers 102 and the square tube horizontal, so as to avoid point contact between the auxiliary rollers 102 and the square tube and cause stress concentration.

[0030] Optimized based on the above implementation, as Figure 8 shown, the pressing wheel 100 includes a first sub-disk 103 and a second sub-disk 104 that are distributed relatively. The two edge guards 101 are respectively arranged on the first sub-disk 103 and the second sub-disk 104. In the middle of the first sub-disk 103, there is provided a ridge sleeve 105. In the middle of the second sub-disk 104, there is provided a jack that cooperates with the ridge sleeve 105. On the first sub-disk 103 and the second sub-disk 104 outside the ridge sleeve 105, several inserting ridges 106 that are distributed crosswise are provided; In the present invention, two retaining edges 101 are respectively arranged on the first dividing plate 103 and the second dividing plate 104. The adjustable setting of the distance between the first dividing plate 103 and the second dividing plate 104 can adjust the distance between the two retaining edges 101, thereby facilitating the passing of square tubes of different specifications through the two retaining edges 101 and facilitating the processing of square tubes of different specifications. The distance adjustment method between the first dividing plate 103 and the second dividing plate 104 can be realized by bolts, nuts, clamping structures, etc.; the combined use of the rib sleeve 105 and the jack can guide the first dividing plate 103 and the second dividing plate 104, so that when the distance between the first dividing plate 103 and the second dividing plate 104 is adjusted, the relative positions of the first dividing plate 103 and the second dividing plate 104 are ensured to be fixed, that is, the rib sleeve 105 and the jack can play a main guiding role for the first dividing plate 103 and the second dividing plate 104; when the distance between the first dividing plate 103 and the second dividing plate 104 is adjusted, a gap will be generated between the first dividing plate 103 and the second dividing plate 104. The existence of this gap causes the pressing wheel 100 to be unable to provide a driving force for the corresponding position on the square tube, thereby easily causing deformation of the square tube. To avoid this phenomenon, a number of inserting ribs 106 can be provided on both the first dividing plate 103 and the second dividing plate 104, and the inserting ribs 106 on the first dividing plate 103 and the inserting ribs 106 on the second dividing plate 104 are cross-distributed, so that the outer wall of the square tube can be effectively pressed by a number of inserting ribs 106, thereby ensuring that a comprehensive and effective pressing is always provided for the outer wall of the square tube under the condition that the distance between the first dividing plate 103 and the second dividing plate 104 is allowed to be adjusted. In some embodiments, the pressing wheel 100, the top wheel 200 and the filling body 300 can be arranged on the workbench 400, and motors 401, oil cylinders 402, etc. that can provide power for the movement of each structure such as the movement of the pressing wheel 100, the rotation of the pressing wheel 100, and the movement of the top wheel 200 can be arranged on the workbench 400. At the same time, to ensure the synchronous relative movement of the two top wheels 200, a synchronous structure 403 can also be arranged on the workbench 400.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A bending and forming equipment for aluminum alloy straight-wall square tube, characterized in that: It comprises an extrusion wheel for actively extruding the square tube, two top wheels for blocking the square tube and a filling body for supporting the square tube, wherein the extrusion wheel and the two top wheels are distributed in a triangle; The filling body comprises a plurality of single sheets arranged in a straight line, a plurality of external support bodies arranged on each of the single sheets, and a flexible connecting piece connecting two adjacent single sheets, wherein the external support bodies are used to support the inner angles of the square tubes.

2. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 1, characterized in that: A plurality of inner grooves are provided in the single piece, and the plurality of inner grooves intersect and communicate with each other, and a movable rod is slidably arranged in each inner groove, and the movable rod is connected to the outer support body; The flexible connector is a hose and is connected to the intersection of each inner groove, and two adjacent single sheets are connected through the flexible connector.

3. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 1, characterized in that: The outer support body is made of one of elastic metal materials, fiber-reinforced composite materials or foam materials.

4. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 1, characterized in that: The outer support body is provided with a plurality of deformation grooves, and the plurality of deformation grooves are arranged along the length direction of the filling body.

5. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 2, characterized in that: A plurality of auxiliary wheel bodies are arranged on the single piece, and at least in a part of the travel of the movable rod, the auxiliary wheel bodies are located outside the outer support body.

6. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 2, characterized in that: The filling body further comprises a winding roller and a conveying tube, wherein the winding roller is used for winding the conveying tube, and the conveying tube is connected to the flexible connecting piece at one end of the filling body.

7. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 1, characterized in that: A chain belt is arranged on the two top wheels, and the top wheels are movably arranged along the direction of the connection line between the two top wheels, and the chain belt is kept in a taut state; A plurality of rubber rollers are arranged on the outer wall of the chain belt.

8. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 7, characterized in that: The two top wheels move synchronously relative to each other.

9. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 1, characterized in that: Both end surfaces of the extrusion wheel are provided with ribs, and a plurality of auxiliary rollers are rotatably provided on each of the ribs. The auxiliary rollers are used to extrude the upper surface or the lower surface of the square tube, and the auxiliary rollers are in line contact with the square tube, and the contact line is horizontal.

10. The aluminum alloy straight-wall square tube bending and forming equipment according to claim 9, characterized in that: The extrusion wheel includes a relatively distributed dividing plate 1 and a dividing plate 2, the two retaining edges are respectively arranged on the dividing plate 1 and the dividing plate 2, a rib sleeve is arranged in the middle of the dividing plate 1, a plug hole used in conjunction with the rib sleeve is opened in the middle of the dividing plate 2, and a plurality of mutually cross-distributed plugging ribs are arranged on the dividing plate 1 and the dividing plate 2 outside the rib sleeve.

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