Automatic bending equipment for square section

Abstract

This invention relates to an automatic bending device for square profiles, comprising a slide groove formed on the front wall of a base. A hydraulic cylinder is fixedly connected to the side wall of the base. The output end of the hydraulic cylinder passes through the slide groove and is fixedly connected to a slide plate. A second drive motor is fixedly connected to the bottom wall of the slide plate. The output end of the second drive motor passes through the inner bottom wall of the slide plate and is fixedly connected to a threaded rod. The output end of the third drive motor passes through the top wall of a support base and is fixedly connected to a connecting shaft. A base plate is fixedly connected to the lower side of the front wall of the slide plate. A fixed plate is rotatably connected to the top wall of the base plate. A support plate is fixedly connected to one side of the fixed plate. The end of the rotating plate away from the connecting shaft is slidably connected to the support plate. This application has the advantage of being able to easily and flexibly change different molds to perform bending processes with different curvatures by adjusting the hydraulic cylinder and drive motor in the mechanism, thereby improving processing efficiency.

Description

Technical Field

[0001] This application relates to the technical field of square profile processing, and in particular to an automatic bending device for square profiles. Background Technology

[0002] Square profiles are long strips of metal or non-metal materials with a square or rectangular cross-section, possessing a regular geometric shape and stable structure. They are made from various materials, commonly including aluminum alloys, steel, and plastics, and can be selected according to different application scenarios and performance requirements. Square profiles are characterized by high strength, good rigidity, and ease of processing and installation, and are widely used in construction, machinery manufacturing, electronic equipment, furniture, and other fields.

[0003] In the process of processing square profiles, in order to meet the design requirements of complex structures, bending equipment is usually used to bend the square profiles. External force is applied to make the profile bend around the mold at a specific angle or curvature. The curvature is usually determined by the mold. Currently, common bending equipment selects and installs a mold that meets the required curvature when bending square profiles, and then performs bending processing. However, when square profiles need to be processed with different curvatures, the operator needs to disassemble and replace the mold at any time. This is not only troublesome to operate, but also affects the bending efficiency of square profiles. Therefore, its actual use effect is poor. Summary of the Invention

[0004] To address the aforementioned problems, this application provides an automatic bending device for square profiles.

[0005] This application provides an automatic bending device for square profiles, which adopts the following technical solution: An automatic bending device for square profiles includes a base, a mandrel mechanism on the upper side of the base, an adjustment mechanism on the front side of the base, and a limit mechanism on the upper side of the adjustment mechanism. The adjustment mechanism includes a slide groove formed on the front wall of the base. A hydraulic cylinder is fixedly connected to the side wall of the base. The output end of the hydraulic cylinder passes through the slide groove and is fixedly connected to a slide plate. A second drive motor is fixedly connected to the bottom wall of the slide plate. The output end of the second drive motor passes through the inner bottom wall of the slide plate and is fixedly connected to a threaded rod. A support seat is threadedly connected to the outer circumference of the threaded rod. The third drive motor is fixedly connected to the bottom wall of the support seat. The output end of the third drive motor passes through the top wall of the support seat and is fixedly connected to a connecting shaft. A rotating plate, a first mold, and a second mold are arranged sequentially from bottom to top on the outer circumference of the connecting shaft. A base plate is fixedly connected to the lower side of the front wall of the slide plate. A fixed plate is rotatably connected to the top wall of the base plate. A support plate is fixedly connected to one side of the fixed plate. The end of the rotating plate away from the connecting shaft is slidably connected to the support plate.

[0006] As a preferred embodiment of this application, guide rods are fixedly connected to one end of the upper and lower sides of the inner wall of the slide, and the other ends of the two guide rods penetrate the slide plate and are fixedly connected to the other side wall of the slide. Guide rods are fixedly connected to both sides of the inner bottom wall of the support plate, and the top ends of the two guide rods penetrate the rotating plate and are fixedly connected to the inner top wall of the support plate.

[0007] As a preferred embodiment of this application, both sides of the inner bottom wall of the skateboard are fixedly connected to limit rods three, and the top ends of the two limit rods three penetrate the support base and are fixedly connected to the inner top wall of the skateboard.

[0008] As a preferred embodiment of this application, a clamp is fixedly connected to the upper part of the support plate on the side away from the rotating plate, and a clamp is fixedly connected to the upper part of the side wall of the sliding plate.

[0009] As a preferred embodiment of this application, the mandrel mechanism includes a mandrel shell, a threaded rod rotatably connected to the front end of the mandrel shell, a push block threadedly connected to the rear end of the threaded rod through the inner front wall of the mandrel shell, grooves being formed around the inner rear wall of the mandrel shell, limit blocks being slidably connected to the inner walls of multiple grooves, extrusion plates being fixedly connected to the front ends of multiple limit blocks, extrusion plates penetrating the outer wall of the mandrel shell on their opposite sides, springs being fixedly connected to the opposite sides of each limit block, and the other ends of multiple springs being fixedly connected to the inner walls of the grooves.

[0010] As a preferred embodiment of this application, a drive motor is fixedly connected to one side of the rear wall of the base. The output end of the drive motor passes through the inner rear wall of the base and is fixedly connected to a threaded rod. A support plate is threadedly connected to the outer circumference of the threaded rod. A limit rod is passed through one side of the original threaded rod on the support plate. The front and rear ends of the limit rod are fixedly connected to the inner wall of the base. A clamping head is provided on the top wall of the support plate. A connecting rod is provided inside the clamping head. The front end of the connecting rod is located at the rear end of the mandrel shell.

[0011] As a preferred embodiment of this application, the threaded rod is provided with limiting rods on both the upper and lower sides. The front ends of the two limiting rods are fixedly connected to the front wall of the mandrel shell, and the rear ends of the two limiting rods penetrate the push block and are fixedly connected to the rear wall of the mandrel shell.

[0012] As a preferred embodiment of this application, each of the inner walls of the plurality of grooves is fixedly connected to one end of a guide rod, and the other end of each of the plurality of guide rods passes through a limiting block and is fixedly connected to the other side wall of the groove. Each of the plurality of springs is disposed on the outer periphery of the guide rod.

[0013] As a preferred embodiment of this application, the limiting mechanism includes slots, two slots being formed on both sides of the outer periphery of the connecting shaft, two blocks being fixedly connected to both sides of the inner walls of mold one and mold two, two blocks being slidably connected in the slots, a bolt being threaded to the top of the connecting shaft, a connecting plate being rotatably connected to the outer periphery of the bolt, a fixing seat being fixedly connected to both sides of the top wall of the connecting plate, an abutment plate being rotatably connected in both fixing seats, through slots being formed on both sides of the connecting plate, and the two abutment plates passing through the through slots and being disposed in the slots.

[0014] As a preferred embodiment of this application, torsion springs are provided on the outer periphery of both ends of the abutment plate, one end of each torsion spring is fixedly connected to the fixing seat, and the other end of each torsion spring is fixedly connected to the abutment plate.

[0015] In summary, this application includes at least one of the following beneficial technical effects: In this application, a limiting mechanism is used to limit and fix molds 1 and 2 with different curvatures that are fitted around the outer periphery of the connecting shaft. Then, the mandrel mechanism can adjust the movement of the surrounding extrusion plates, thereby flexibly adjusting the overall size of the mandrel to match the square tube to be bent. The square tube is then fitted around the mandrel for bending. When the square tube is initially in mold 1 or mold 2 and is bent with clamps 1 and 2, when different curvatures need to be bent, the hydraulic cylinder in the adjusting mechanism can be used to adjust molds 1 and mold 2 away from the square tube. Then, the height of molds 1 and mold 2 can be adjusted by the drive motor 2 to match the height of the square tube. Finally, the hydraulic cylinder drives mold 1 or mold 2 to approach the square tube and clamp the square tube into mold 1 or mold 2. This allows for convenient and flexible replacement of different molds to perform bending processes with different curvatures, thereby improving processing efficiency. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the overall structure in this invention; Figure 2 This is a rear view schematic diagram of the overall structure in this invention; Figure 3 This is a schematic diagram of the mandrel mechanism in the present invention; Figure 4 This is a side sectional view of the mandrel mechanism in this invention. Figure 5 This is a front cross-sectional view of the mandrel mechanism in this invention. Figure 6 This is a schematic diagram of the connection of the adjustment mechanism in this invention; Figure 7 This is a schematic diagram of the card block connection structure in this invention; Figure 8This is a schematic diagram of the coupling connection structure in this invention; Figure 9 In this invention Figure 8 An enlarged schematic diagram of the structure at point A.

[0017] Explanation of reference numerals in the attached drawings: 1. Base; 2. Mandrel mechanism; 201. Mandrel shell; 202. Threaded rod one; 203. Extrusion plate; 204. Connecting rod; 205. Push block; 206. Limiting rod one; 207. Groove; 208. Limiting block; 209. Spring; 210. Guide rod one; 211. Limiting rod two; 212. Support plate; 213. Drive motor one; 214. Clamping head; 215. Threaded rod two; 3. Adjustment mechanism; 301. Slide groove; 302. Hydraulic cylinder; 303. Slide plate; 304. Guide rod two; 305. Drive... 306. Drive motor 2; 307. Threaded rod 3; 308. Limiting rod 3; 309. Base plate; 310. Fixing plate; 311. Support plate; 312. Support seat; 313. Rotating plate; 314. Guide rod 3; 315. Mold 1; 316. Mold 2; 317. Fixture 1; 318. Coupling shaft; 319. Drive motor 3; 4. Limiting mechanism; 401. Slot; 402. Block; 403. Bolt; 404. Connecting plate; 405. Through slot; 406. Fixing seat; 407. Abutment plate; 408. Torsion spring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail as follows: Example: An automatic bending device for square profiles includes a base 1, a mandrel mechanism 2 is provided on the upper side of the base 1, an adjustment mechanism 3 is provided on the front side of the base 1, and a limit mechanism 4 is provided on the upper side of the adjustment mechanism 3; The adjusting mechanism 3 includes a slide groove 301, which is formed on the front wall of the base 1. A hydraulic cylinder 302 is fixedly connected to the side wall of the base 1. The output end of the hydraulic cylinder 302 passes through the slide groove 301 and is fixedly connected to a sliding plate 303. A second drive motor 305 is fixedly connected to the bottom wall of the sliding plate 303. The output end of the second drive motor 305 passes through the inner bottom wall of the sliding plate 303 and is fixedly connected to a threaded rod 306. A support seat 311 is threadedly connected to the outer circumference of the threaded rod 306. A support seat 311 is fixedly connected to the bottom wall of the support seat 311. Drive motor 319, the output end of drive motor 319 passes through the top wall of support base 311 and is fixedly connected to shaft 318. From bottom to top, rotating plate 312, mold 1 314 and mold 2 315 are arranged on the outer periphery of shaft 318. Base plate 308 is fixedly connected to the lower side of front wall of slide plate 303. Fixed plate 309 is rotatably connected to the top wall of base plate 308. Support plate 310 is fixedly connected to one side of fixed plate 309. The end of rotating plate 312 away from shaft 318 is slidably connected to support plate 310.

[0020] By activating the hydraulic cylinder 302, the slide plate 303 connected to the output end can move within the slide groove 301. When the slide plate 303 moves, it can move the support base 311 horizontally. When the support base 311 moves horizontally, it can move mold one 314 and mold two 315 horizontally. By activating the drive motor two 305, the threaded rod three 306 connected to the output end can be rotated. When the threaded rod three 306 rotates, it can drive the connected support base 311 to move up and down along the threaded rod three 306. When the support base 311 moves up and down, it can move mold one 314 and mold two 315, thereby adjusting the height of mold one 314 and mold two 315. Furthermore, because the rotating plate 312 connected by the coupling 318 slides within the support plate 310, and the support plate 310 is fixed by the plate... 309 is rotatably connected to the base plate 308, and the connection between the fixed plate 309 and the base plate 308 is on the same axis as the connecting shaft 318. Therefore, when the drive motor 319 drives the connecting shaft 318 to rotate, it can drive the rotating plate 312 to drive the support plate 310 and the clamp 316 to rotate normally. This ensures that the device can perform normal bending while allowing the mold 1 314 and mold 2 315 to move. Therefore, by starting the hydraulic cylinder 302, the mold 1 314 and mold 2 315 can be pulled away from the square tube. Then, the drive motor 305 is started to drive the threaded rod 306 to rotate and drive the support base 311 to move the mold 1 314 and mold 2 315 up and down, so that the mold 1 314 or mold 2 315 moves to the height matching the square rod. Then, the hydraulic cylinder 302 is started again to push the mold 1 314 and mold 2 315. By approaching the square tube and allowing it to be inserted into mold 1 314 or mold 2 315 for bending, it is possible to easily adjust different molds to suit different curvatures.

[0021] Guide rods 304 are fixedly connected to one end of the upper and lower sides of the inner wall of the slide 301. The other ends of the two guide rods 304 pass through the slide plate 303 and are fixedly connected to the other side wall of the slide 301. Guide rods 313 are fixedly connected to both sides of the inner bottom wall of the support plate 310. The top ends of the two guide rods 313 pass through the rotating plate 312 and are fixedly connected to the inner top wall of the support plate 310.

[0022] By setting guide rod 2 304, the slide plate 303 can be limited, thereby ensuring the stability of the slide plate 303 moving within the slide groove 301. By setting guide rod 313, the rotating plate 312 can be limited, thereby ensuring the stability of the rotating plate 312 moving up and down within the support plate 310.

[0023] Limiting rods 307 are fixedly connected to both sides of the inner bottom wall of the slide plate 303. The top ends of the two limiting rods 307 pass through the support base 311 and are fixedly connected to the inner top wall of the slide plate 303.

[0024] By setting a limit rod 307, the support seat 311 can be limited, thereby preventing the support seat 311 from rotating. When the threaded rod 306 rotates, it cannot drive the support seat 311 to rotate. Thus, when the threaded rod 306 rotates, the support seat 311 can be driven to move normally up and down along the threaded rod 306.

[0025] A clamp 316 is fixedly connected to the upper part of the support plate 310 on the side away from the rotating plate 312, and a clamp 317 is fixedly connected to the upper part of the side wall of the slide plate 303.

[0026] After the square tube is inserted into the mold, the square tube can be clamped and limited by the second clamp 317. Then, the first clamp 316 is started to hold the square tube. At this time, when the third drive motor 319 is started to drive the connecting shaft 318 to rotate, the rotating plate 312, the support plate 310 and the first clamp 316 can be rotated, thereby enabling the square tube to be bent.

[0027] The mandrel mechanism 2 includes a mandrel shell 201. A threaded rod 202 is rotatably connected to the front end of the mandrel shell 201. The rear end of the threaded rod 202 passes through the inner front wall of the mandrel shell 201 and is threadedly connected to a push block 205. Grooves 207 are provided around the inner rear wall of the mandrel shell 201. Limiting blocks 208 are slidably connected to the inner walls of the multiple grooves 207. Extrusion plates 203 are fixedly connected to the front ends of the multiple limiting blocks 208. The extrusion plates 203 pass through the outer wall of the mandrel shell 201 on the side furthest from each other. One end of a spring 209 is fixedly connected to the side furthest from each limiting block 208. The other end of the multiple springs 209 is fixedly connected to the inner wall of the groove 207.

[0028] A drive motor 213 is fixedly connected to one side of the rear wall of the base 1. The output end of the drive motor 213 passes through the inner rear wall of the base 1 and is fixedly connected to a threaded rod 215. A support plate 212 is threadedly connected to the outer circumference of the threaded rod 215. A limit rod 211 passes through one side of the original threaded rod 215 on the support plate 212. The front and rear ends of the limit rod 211 are fixedly connected to the inner wall of the base 1. A clamping head 214 is provided on the top wall of the support plate 212. A connecting rod 204 is provided inside the clamping head 214. The front end of the connecting rod 204 is located at the rear end of the mandrel shell 201.

[0029] Rotating the threaded rod 202 can drive the pusher 205 to move. Since the pusher 205 has inclined surfaces on all sides and abuts against the pusher 205, when the pusher 205 moves backward, it can push the pressing plate 203 that abuts against the pusher to move outward, thereby expanding the size of the mandrel. When the pressing plate 203 moves outward, it will also drive the limiting block 208 to move and compress the spring 209. Therefore, when the threaded rod 202 is rotated in the opposite direction to drive the pusher 205 to reset and move, the spring 209 can pull the limiting block 208 to reset the pressing plate 203 and retract it into the mandrel shell 201. This allows for flexible adjustment of the mandrel size to accommodate the support of square tubes of different specifications.

[0030] Limiting rods 206 are provided on both the upper and lower sides of the threaded rod 202. The front ends of the two limiting rods 206 are fixedly connected to the inner front wall of the mandrel shell 201, and the rear ends of the two limiting rods 206 pass through the push block 205 and are fixedly connected to the rear wall of the mandrel shell 201.

[0031] By setting a limit rod 206, the push block 205 can be limited, so the push block 205 cannot be driven to rotate when the threaded rod 202 rotates. This ensures that the push block 205 can be driven to move along the threaded rod 202 when the threaded rod 202 rotates.

[0032] Multiple grooves 207 have one end of a guide rod 210 fixedly connected to the inner sidewall of each groove 207. The other end of each guide rod 210 passes through the limiting block 208 and is fixedly connected to the other sidewall of the groove 207. Multiple springs 209 are arranged on the outer periphery of the guide rod 210.

[0033] By setting guide rod 210, the limiting block 208 and spring 209 can be limited respectively, thereby ensuring the stability of the movement of the limiting block 208 and preventing the spring 209 from bending when compressed, thus ensuring the normal use effect of the spring 209.

[0034] The limiting mechanism 4 includes slots 401, with two slots 401 opening on both sides of the outer periphery of the connecting shaft 318. The inner walls of mold 1 314 and mold 2 315 are fixedly connected to two blocks 402, which are slidably connected in the slots 401. The top of the connecting shaft 318 is threadedly connected to a bolt 403, and a connecting plate 404 is rotatably connected to the outer periphery of the bolt 403. The top walls of the connecting plate 404 are fixedly connected to two fixed seats 406, and abutment plates 407 are rotatably connected in the two fixed seats 406. The connecting plate 404 has through slots 405 on both sides, and the two abutment plates 407 pass through the through slots 405 and are set in the slots 401.

[0035] By fitting mold 1 314 and mold 2 315 onto the outer periphery of connecting shaft 318, and engaging the locking block 402 into the locking groove 401 on connecting shaft 318, the engagement of locking block 402 and locking groove 401 ensures that mold 1 314 and mold 2 315 can rotate with connecting shaft 318. Then, bolt 403 is screwed into connecting shaft 318 from the top, and during screwing, abutment plate 407 is inserted into locking groove 401. Locking groove 401 limits the position of abutment plate 407. Subsequently, the rotation of bolt 403 allows for pushing... The movable connecting plate 404 drives the abutment plate 407 to move downward, causing the abutment plate 407 to abut against the top wall of the second mold 315, thereby limiting the first mold 314 and the second mold 315 and preventing them from detaching from the connecting shaft 318. When it is necessary to disassemble the first mold 314 and the second mold 315, the abutment plate 407 can be rotated to be positioned above the connecting plate 404. Since the cross-sectional shape of the abutment plate 407 is the same as that of the connecting shaft 318 when it is rotated to the upper side of the connecting plate 404, the first mold 314 or the second mold 315 can be directly pulled out along the connecting shaft 318.

[0036] Both ends of the abutment plate 407 are provided with torsion springs 408. One end of each torsion spring 408 is fixedly connected to the fixing seat 406, and the other end of each torsion spring 408 is fixedly connected to the abutment plate 407.

[0037] The torsion spring 408 can pull the abutment plate 407 into the slot 401, ensuring the stability of the abutment plate 407 in the slot 401. When the abutment plate 407 is rotated upward, the torsion spring 408 will also be pulled, and the torsion spring 408 can also be easily pulled to reset the abutment plate 407.

[0038] This automatic bending equipment for square profiles operates by fitting mold 1 (314) and mold 2 (315) onto the outer periphery of a connecting shaft (318). Bolts (403) are then screwed into the connecting shaft (318), causing the abutment plate (407) to insert into the slot (401) and fix mold 1 (314) and mold 2 (315). Mold 1 (314) then bends the square tube. When mold 2 (315) needs to be changed to bend the square tube with different curvatures, hydraulic cylinder (302) is activated to pull slide plate (303), causing support plate (310) and mold 1 (314) away from the square tube, allowing the square tube to be pulled out of the slot in mold 1 (314). Then, drive motor 2 (305) is activated to rotate threaded rod 306, driving support base (311) to move mold 1 (314) and mold 2 (315) downwards, thus moving mold 2 (315) to a height matching the square rod. Finally, hydraulic cylinder 302 is activated again to push slide plate 303, moving support plate 310 and mold 2 (315) together. Approach the square tube and allow it to be inserted into the mold 315. Then start the drive motor 319 to drive the rotating plate 312 to drive the support plate 310 and the clamp 316 to rotate, thereby bending the square rod and making it easy to change different molds to bend the square tube with different curvatures. Furthermore, when bending a square tube, a mandrel is usually inserted into the square tube to support its inner wall. Before inserting the mandrel, rotating the threaded rod 202 can move the push block 205. When the push block 205 moves backward, it can push the pressing plate 203 that is abutting on all sides to move outward, thereby expanding the size of the mandrel. When the pressing plate 203 moves outward, it will also move the limiting block 208 and compress the spring 209. Therefore, when the threaded rod 202 is rotated in the opposite direction to drive the push block 205 to reset and move, the spring 209 can pull the limiting block 208 to reset the pressing plate 203 and retract it into the mandrel shell 201. This allows for flexible adjustment of the mandrel size to accommodate support for square tubes of different specifications.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. An automatic bending device for square profiles, comprising a base (1), characterized in that: The base (1) is provided with a core rod mechanism (2) on its upper side, and an adjustment mechanism (3) is provided on the front side of the base (1). A limit mechanism (4) is provided on the upper side of the adjustment mechanism (3). The adjusting mechanism (3) includes a slide groove (301), which is formed on the front wall of the base (1). A hydraulic cylinder (302) is fixedly connected to the side wall of the base (1). The output end of the hydraulic cylinder (302) passes through the slide groove (301) and is fixedly connected to a sliding plate (303). A second drive motor (305) is fixedly connected to the bottom wall of the sliding plate (303). The output end of the second drive motor (305) passes through the bottom wall of the sliding plate (303) and is fixedly connected to a threaded rod (306). A support seat (311) is threadedly connected to the outer circumference of the threaded rod (306). The bottom wall of the support seat (311) is fixedly connected to... A drive motor (319) is connected to the top wall of the support base (311) and a connecting shaft (318) is fixedly connected to the output end of the drive motor (319). A rotating plate (312), a mold (314) and a mold (315) are arranged sequentially from bottom to top on the outer periphery of the connecting shaft (318). A base plate (308) is fixedly connected to the lower side of the front wall of the sliding plate (303). A fixing plate (309) is rotatably connected to the top wall of the base plate (308). A support plate (310) is fixedly connected to one side of the fixing plate (309). The end of the rotating plate (312) away from the connecting shaft (318) is slidably connected to the support plate (310).

2. The automatic bending equipment for square profiles according to claim 1, characterized in that: The inner sidewall of the slide (301) is fixedly connected to one end of the guide rod two (304) on both sides. The other ends of the two guide rod two (304) pass through the slide plate (303) and are fixedly connected to the other sidewall of the slide (301). The inner bottom wall of the support plate (310) is fixedly connected to both sides of the guide rod three (313). The top ends of the two guide rod three (313) pass through the rotating plate (312) and are fixedly connected to the inner top wall of the support plate (310).

3. The automatic bending equipment for square profiles according to claim 1, characterized in that: Limiting rods (307) are fixedly connected to both sides of the inner bottom wall of the slide plate (303). The top ends of the two limiting rods (307) pass through the support base (311) and are fixedly connected to the inner top wall of the slide plate (303).

4. The automatic bending equipment for square profiles according to claim 1, characterized in that: The upper part of the support plate (310) away from the rotating plate (312) is fixedly connected to a clamp one (316), and the upper part of the side wall of the slide plate (303) is fixedly connected to a clamp two (317).

5. The automatic bending equipment for square profiles according to claim 1, characterized in that: The mandrel mechanism (2) includes a mandrel shell (201), a threaded rod (202) is rotatably connected to the front end of the mandrel shell (201), the rear end of the threaded rod (202) passes through the inner front wall of the mandrel shell (201) and is threadedly connected to a push block (205), grooves (207) are provided around the inner rear wall of the mandrel shell (201), a limit block (208) is slidably connected to the inner wall of the multiple grooves (207), an extrusion plate (203) is fixedly connected to the front end of the multiple limit blocks (208), the extrusion plates (203) pass through the outer wall of the mandrel shell (201) on the opposite side, one end of a spring (209) is fixedly connected to the opposite side of the limit blocks (208), and the other end of the multiple springs (209) is fixedly connected to the inner wall of the groove (207).

6. The automatic bending equipment for square profiles according to claim 5, characterized in that: A drive motor (213) is fixedly connected to one side of the rear wall of the base (1). The output end of the drive motor (213) passes through the inner rear wall of the base (1) and is fixedly connected to a threaded rod (215). A support plate (212) is threadedly connected to the outer periphery of the threaded rod (215). A limit rod (211) passes through one side of the original threaded rod (215) of the support plate (212). The front and rear ends of the limit rod (211) are fixedly connected to the inner wall of the base (1). A clamping head (214) is provided on the top wall of the support plate (212). A connecting rod (204) is provided inside the clamping head (214). The front end of the connecting rod (204) is located at the rear end of the mandrel shell (201).

7. The automatic bending equipment for square profiles according to claim 5, characterized in that: The threaded rod (202) is provided with limit rods (206) on both the upper and lower sides. The front ends of the two limit rods (206) are fixedly connected to the inner front wall of the mandrel shell (201), and the rear ends of the two limit rods (206) pass through the push block (205) and are fixedly connected to the rear wall of the mandrel shell (201).

8. The automatic bending equipment for square profiles according to claim 5, characterized in that: Each of the inner walls of the multiple grooves (207) is fixedly connected to one end of a guide rod (210), and the other end of each of the multiple guide rods (210) passes through the limiting block (208) and is fixedly connected to the other side wall of the groove (207). Each of the multiple springs (209) is arranged on the outer periphery of the guide rod (210).

9. The automatic bending equipment for square profiles according to claim 1, characterized in that: The limiting mechanism (4) includes a slot (401), two slots (401) are opened on both sides of the outer periphery of the connecting shaft (318), and two blocks (402) are fixedly connected to both sides of the inner wall of the mold one (314) and the mold two (315). The two blocks (402) are slidably connected in the slot (401). The top of the connecting shaft (318) is threaded with a bolt (403), and a connecting plate (404) is rotatably connected to the outer periphery of the bolt (403). Fixed seats (406) are fixedly connected to both sides of the top wall of the connecting plate (404), and abutment plates (407) are rotatably connected in both fixed seats (406). Through slots (405) are opened on both sides of the connecting plate (404), and the two abutment plates (407) pass through the through slots (405) and are set in the slot (401).

10. An automatic bending device for square profiles according to claim 9, characterized in that: Both ends of the abutment plate (407) are provided with torsion springs (408), one end of each torsion spring (408) is fixedly connected to the fixing seat (406), and the other end of each torsion spring (408) is fixedly connected to the abutment plate (407).

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