Aluminum profile variable cross-section extrusion die based on telescopic core structure

Abstract

This invention relates to the field of extrusion die technology, specifically to an aluminum profile variable cross-section extrusion die based on a retractable die core structure. The die includes an upper die structure, a lower die structure, and a die hole formed in the lower die structure. A die core structure is movably mounted vertically on the bottom of the upper die structure, and a moving unit is installed on the upper die structure to drive the die core structure to move vertically at a fixed height. By setting a retractable die core structure with several extrusion sections that gradually decrease in size from top to bottom, this invention allows the moving unit to move the die core structure vertically at equal heights, moving extrusion sections of different sizes to positions that mate with the die hole. Different gaps are left when the extrusion sections of different sizes mate with the die hole, enabling the extrusion of aluminum profiles with different wall thicknesses. This eliminates the need to change different dies, reducing manufacturing costs and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of extrusion die technology, specifically to an aluminum profile variable cross-section extrusion die based on a retractable die core structure. Background Technology

[0002] Aluminum extrusion dies are core components in aluminum profile production, used to design and manufacture various aluminum products. An extrusion die mainly consists of an upper die structure, a lower die structure, and a core structure connected to the bottom of the upper die structure. The core structure cooperates with the die holes in the lower die structure to form the cavity for extruding the aluminum product. Aluminum material is extruded from the flow holes in the upper die structure into the welding chamber between the upper and lower die structures, and finally extruded through the die holes at the bottom of the welding chamber to form the final product.

[0003] The existing core structure is generally connected to the upper mold structure. The cavity structure formed by the core structure and the mold hole is unique, and the cross-sectional shape and wall thickness of the produced aluminum profile are also unique. When producing aluminum profiles with different cross-sectional shapes or wall thicknesses, the extrusion mold needs to be disassembled and replaced. Each aluminum profile with a different cross-sectional shape or wall thickness needs to be extruded using a separate mold.

[0004] For aluminum profiles with varying wall thicknesses but identical cross-sectional shapes, the die structures used for extrusion are essentially the same, with only the size of the die core differing. This necessitates the manufacture of individual dies, leading to high manufacturing costs. Similarly, for aluminum profiles with identical outer walls (such as "U-shaped," "Sun-shaped," or "Field-shaped" profiles) but different internal connection structures, the upper and lower die structures used in production are often identical, with only the die core structure differing. However, since the die core structure is integrated with the upper die structure, and the upper and lower die structures are complementary, individual dies are still required, resulting in high manufacturing costs. Furthermore, when there are many dies, locating, disassembling, and replacing the required die takes considerable time, impacting production efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an aluminum profile variable cross-section extrusion die based on a retractable core structure, comprising an upper die structure, a lower die structure, and a die hole formed on the lower die structure. The core structure is movably mounted on the bottom of the upper die structure, and a moving unit is installed on the upper die structure to drive the core structure to move up and down at a fixed height.

[0006] The mold core structure includes a movable section that is movably installed at the bottom of the upper mold structure. Several extrusion sections are fixedly connected from top to bottom at the bottom of the movable section. The extrusion sections gradually decrease in size from top to bottom. The extrusion sections are clearance-fitted with the mold holes. A cross-shaped through groove is opened on the several extrusion sections. The through groove extends upward through the movable section. Insert plate one and insert plate two are slidably installed inside the through groove. The top of insert plate one and the bottom of insert plate two are both provided with grooves, and the grooves of the two are cross-shaped and interlocked with each other.

[0007] The upper mold structure is also equipped with a second moving unit that drives the first and second insert plates to move upward in sequence.

[0008] In one possible implementation, the extrusion section includes guide portions and forming portions distributed vertically, the guide portions gradually decreasing in size from top to bottom, the forming portions being fixedly connected to the bottom of the corresponding guide portions, the top of the uppermost guide portion being fixedly connected to the bottom of the movable section, the top of the other guide portions being fixedly connected to the bottom of the next higher forming portion, and the forming portions being clearance-fitted with the die orifice.

[0009] In one possible implementation, the moving unit includes threaded columns rotatably mounted inside the upper mold structure and symmetrically distributed on the left and right sides. A drive ring is threadedly connected to both threaded columns. The drive ring is fixedly connected to the movable section via a connecting rod. A drive assembly for driving the threaded columns to rotate is mounted on the upper mold structure.

[0010] In one possible implementation, the drive assembly includes a gear ring rotatably mounted inside an upper mold structure, an internal hexagonal knob rotatably mounted on the top of the upper mold structure, a drive gear located inside the upper mold structure coaxially fixedly connected to the bottom of the internal hexagonal knob, the drive gear meshing with the gear ring, and a driven gear coaxially fixedly mounted on a threaded post, the driven gear meshing with the gear ring.

[0011] In one possible implementation, the upper mold structure is further equipped with a limiting component for restricting the rotation of the gear ring. The limiting component includes a movable rod that slides up and down on the gear ring. A pressing block is fixedly connected to the top of the movable rod. A return spring is fixedly connected between the bottom of the pressing block and the top of the gear ring. An arc-shaped groove for the pressing block to move is provided on the top of the upper mold structure. A limiting block is fixedly connected to the front side of the pressing block. A plurality of circumferentially evenly distributed limiting grooves are provided on the front sidewall of the arc-shaped groove. The limiting block and the limiting groove are inserted into each other.

[0012] In one possible implementation, the second moving unit includes a movable sleeve rotatably mounted on the first driving ring. Two second driving rings are vertically distributed and movably mounted inside the upper mold structure. The upper second driving ring is fixedly connected to the top of the first insert plate via a connecting bracket, and the lower second driving ring is fixedly connected to the top of the second insert plate via a connecting bracket. A plurality of guide blocks are evenly installed circumferentially on the outer ring wall of the second driving ring. The movable sleeve has guide grooves one and two corresponding to the guide blocks. The upper guide block slides into guide groove one, and the lower guide block slides into guide groove two. A rotating rod is fixedly connected to the front side of the movable sleeve.

[0013] In one possible implementation, the first guide channel consists of a horizontal section and an inclined section connected to the right end of the horizontal section and sloping downwards, and the second guide channel consists of a horizontal section and an inclined section connected to the left end of the horizontal section and sloping upwards. The inclined section of the first guide channel is located above the horizontal section of the second guide channel, and the horizontal section of the first guide channel is located above the inclined section of the second guide channel.

[0014] In one possible implementation, an E-shaped movable groove is provided on the outer ring wall of the upper mold structure, and the front end of the rotating rod passes through the movable groove to the outside of the upper mold structure.

[0015] In one possible implementation, the movable sleeve is further equipped with a limiting component two that restricts its rotation. The limiting component two includes a movable frame that is slidably mounted on the rotating rod. A positioning block is fixedly connected to the bottom of the movable frame. A return spring two is fixedly connected between the bottom of the rotating rod and the inner wall of the movable frame. A plurality of circumferentially evenly distributed positioning holes are opened on the drive ring one. The positioning block is inserted into the positioning holes. A pressure rod is slidably mounted on the rotating rod. The front end of the pressure rod protrudes to the front of the rotating rod. A triangular plate is fixedly connected to the top of the rear end of the pressure rod. The triangular plate is slidably connected to the rotating rod and its top end protrudes to the outside of the rotating rod. The inclined surface of the rear side of the triangular plate is slidably engaged with the top edge of the movable frame.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention sets up a retractable mold core structure, which has several extrusion sections that gradually decrease in size from top to bottom. When the moving unit moves the mold core structure up and down at the same height, it can move the extrusion sections of different sizes to positions that match the mold holes. Different sizes of extrusion sections will leave different gaps when they match the mold holes, which can extrude aluminum profiles of different wall thicknesses without the need to change different molds, thereby reducing manufacturing costs and improving production efficiency.

[0017] 2. This invention uses the cooperation of the movable sleeve and two drive rings to sequentially move the insert plate one and insert plate two upwards. When insert plate one and insert plate two are combined with the extrusion section, the cavity between the extrusion section and the die hole is U-shaped. When insert plate one moves upwards, the extrusion section is divided into left and right parts, and the cavity between the extrusion section and the die hole is H-shaped. Then, when insert plate two moves upwards, the extrusion section is divided into four parts, and the cavity between the extrusion section and the die hole is Grid-shaped. By changing the extrusion section from U-shaped to H-shaped and Grid-shaped in sequence, aluminum profiles with different cross-sectional shapes can be produced, reducing manufacturing costs, eliminating the need to change different molds, and improving production efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the front half-section of the present invention.

[0020] Figure 3 This is a three-dimensional structural schematic diagram of the first moving unit of the present invention.

[0021] Figure 4 This is the present invention. Figure 2 Enlarged view of point A in the middle.

[0022] Figure 5 This is a planar structural schematic diagram of the arc-shaped groove of the present invention viewed from below.

[0023] Figure 6 This is a three-dimensional structural diagram of the driving ring and the moving segment of the present invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the movable sleeve of the present invention.

[0025] Figure 8 This is a partial cross-sectional view of the limiting component two of the present invention.

[0026] Figure 9 This is a diagram showing the changing states of different extrusion sections and die orifices in this invention.

[0027] Figure 10 This is a diagram showing the changing states of the mold core structure of the present invention in different forms.

[0028] In the diagram: 1. Upper mold structure; 11. Movable groove; 2. Lower mold structure; 21. Mold hole; 3. Mold core structure; 31. Movable section; 32. Extrusion section; 321. Guide section; 322. Forming section; 33. Insert plate one; 34. Insert plate two; 4. Moving unit one; 41. Threaded column; 42. Drive ring one; 43. Drive assembly; 431. Gear ring; 432. Hexagonal knob; 433. Drive gear; 434. Driven gear; 44. Limiting assembly one; 441 442. Movable rod; 443. Pressing block; 444. Return spring one; 445. Arc groove; 446. Limiting block; 5. Moving unit two; 51. Movable sleeve; 511. Guide groove one; 512. Guide groove two; 52. Drive ring two; 521. Guide block; 53. Rotating rod; 54. Limiting component two; 541. Movable frame; 542. Positioning block; 543. Return spring two; 544. Positioning hole; 545. Pressing rod; 546. Triangular plate. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Please see Figure 1 - Figure 10 A variable cross-section extrusion die for aluminum profiles based on a retractable core structure includes an upper die structure 1, a lower die structure 2, and a die hole 21 opened on the lower die structure 2. A core structure 3 is movably mounted on the bottom of the upper die structure 1, and a moving unit 4 is mounted on the upper die structure 1 to drive the core structure 3 to move up and down at a certain height.

[0031] The core structure 3 includes a movable section 31 that is movably installed at the bottom of the upper mold structure 1. Several extrusion sections 32 are fixedly connected from top to bottom at the bottom of the movable section 31. The extrusion sections 32 gradually decrease in size from top to bottom. The extrusion sections 32 are clearance-fitted with the mold hole 21. A cross-shaped through groove is opened on the several extrusion sections 32. The through groove passes through the movable section 31 upward. Insert plate 1 33 and insert plate 2 34 are slidably installed inside the through groove. The top of insert plate 1 33 and the bottom of insert plate 2 34 are both provided with grooves, and the grooves of the two are cross-shaped and interlocked with each other.

[0032] The upper mold structure 1 is also equipped with a moving unit 2 5 that drives the insert plate 1 33 and the insert plate 2 34 to move upward in sequence.

[0033] In practical use, when producing aluminum profiles with different wall thicknesses, the moving unit 4 drives the movable section 31 and several extrusion sections 32 to move upward at the same height, moving the extrusion sections 32 of different sizes to positions that cooperate with the die hole 21. Different gaps are left between the extrusion sections 32 of different sizes and the inner wall of the die hole 21, which can be adjusted according to the production needs of aluminum profiles with different wall thicknesses without changing the mold, thus improving production efficiency.

[0034] When producing aluminum profiles with different cross-sectional shapes, in the initial state, the bottoms of insert plate 1 33 and insert plate 2 34 are flush with the bottom of the lowest extrusion section 32. At this time, the cavity formed between the extrusion section 32 and the inner wall of the die hole 21 is U-shaped, which can extrude aluminum profiles with U-shaped cross-sections. When the moving unit 2 5 moves insert plate 1 33 upward and separates it from the extrusion section 32, the extrusion section 32 is divided into left and right parts. At this time, the cavity between the extrusion section 32 and the die hole 21 is H-shaped, which can extrude aluminum profiles with H-shaped cross-sections. Then, when insert plate 2 34 moves upward, the extrusion section 32 is divided into four parts. At this time, the cavity between the extrusion section 32 and the die hole 21 is Grid-shaped, which can extrude aluminum profiles with Grid-shaped cross-sections. By changing the extrusion section 32 from U-shaped to H-shaped and Grid-shaped in sequence, aluminum profiles with different cross-sectional shapes can be produced without changing different molds, thus improving production efficiency.

[0035] Please see Figure 2 , Figure 9 and Figure 10 The extrusion section 32 includes guide sections 321 and forming sections 322 distributed vertically. The guide sections 321 gradually decrease in size from top to bottom. The forming sections 322 are fixedly connected to the bottom of the corresponding guide sections 321. The top of the uppermost guide section 321 is fixedly connected to the bottom of the movable section 31. The tops of the other guide sections 321 are fixedly connected to the bottom of the next-level forming section 322. The forming section 322 is clearance-fitted with the die hole 21.

[0036] In practical use, by setting the guide part 321 to a structure that gradually shrinks from top to bottom, the connection between the upper and lower forming parts 322 can be made smoother. The forming part 322 is fitted into the mold hole 21 with a gap, and an extrusion cavity is formed between the forming part 322 and the mold hole 21. The guide part 321 and the top of the mold hole 21 form a trumpet-shaped guiding structure, which is conducive to guiding the aluminum material downward into the cavity for extrusion forming.

[0037] Please see Figure 2 and Figure 3 The moving unit 4 includes threaded columns 41 that are rotatably installed inside the upper mold structure 1 and symmetrically distributed on the left and right. A drive ring 42 is threadedly connected to the two threaded columns 41. The drive ring 42 is fixedly connected to the movable section 31 through a connecting rod. A drive assembly 43 that drives the threaded columns 41 to rotate is installed on the upper mold structure 1.

[0038] In practical use, the drive assembly 43 drives the threaded column 41 to rotate a number of times, and the threaded column 41 drives the drive ring 42 to move upward at a certain height. The drive ring 42 drives the movable section 31 and the extrusion section 32 to move upward at a certain height. This allows for switching between different sizes of the extrusion section 32 and the die hole 21 to facilitate the extrusion of aluminum profiles of different thicknesses.

[0039] Please see Figure 1 - Figure 3 The drive assembly 43 includes a gear ring 431 rotatably mounted inside the upper mold structure 1, an internal hexagonal knob 432 rotatably mounted on the top of the upper mold structure 1, a drive gear 433 located inside the upper mold structure 1 coaxially fixedly connected to the bottom of the internal hexagonal knob 432, the drive gear 433 meshing with the gear ring 431, and a driven gear 434 coaxially fixedly mounted on the threaded column 41, the driven gear 434 meshing with the gear ring 431.

[0040] In practical use, rotating the hexagonal knob 432 drives the drive gear 433 to rotate, which in turn drives the gear ring 431 to rotate. The gear ring 431 simultaneously drives the two driven gears 434 to rotate, which in turn causes the two threaded posts 41 to rotate simultaneously. This allows the two threaded posts 41 to synchronously drive the drive ring 42 to move up and down, improving the stability of the drive ring 42's movement. By limiting the number of rotations of the hexagonal knob 432, the gear ring 431 can rotate at equal angles, thereby driving the driven gears 434 and the threaded posts 41 to rotate an equal number of times.

[0041] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 The upper mold structure 1 is also equipped with a limiting component 44 for limiting the rotation of the gear ring 431. The limiting component 44 includes a movable rod 441 that is slidably mounted on the gear ring 431. A pressing block 442 is fixedly connected to the top of the movable rod 441. A return spring 443 is fixedly connected between the bottom of the pressing block 442 and the top of the gear ring 431. An arc-shaped groove 444 for the pressing block 442 to move is opened on the top of the upper mold structure 1. A limiting block 445 is fixedly connected to the front side of the pressing block 442. A number of circumferentially evenly distributed limiting grooves 446 are opened on the front side wall of the arc-shaped groove 444. The limiting block 445 and the limiting groove 446 are inserted into each other.

[0042] In actual use, in the initial state, the limiting block 445 is inserted into the rightmost limiting groove 446. The mutual engagement of the limiting block 445 and the limiting groove 446 limits the toothed ring 431, preventing the toothed ring 431 from rotating and ensuring the stability between the extrusion section 32 and the upper mold structure 1.

[0043] When adjusting the extrusion section 32 upwards, first press down on the pressing block 442. The pressing block 442 will cause the limiting block 445 to move downwards and separate from the limiting groove 446. At this time, the movable rod 441 retracts into the gear ring 431, and the return spring 443 is compressed and retracts. Then, by rotating the hexagonal knob 432, the gear ring 431 is rotated, adjusting the extrusion section 32 up and down. When the gear ring 431 rotates, it will cause the pressing block 442 to rotate as well, causing the pressing block 442 to slide along the arc groove 444. During rotation, release the pressure on the pressing block 442. At this time, the limiting block 445 will slide along the arc groove 446. The lower side of the front wall of 44 slides. When the limiting block 445 moves to the next limiting groove 446, the return force of the return spring 443 pushes the pressing block 442 upward, so that the limiting block 445 is inserted into the next limiting groove 446 to limit the gear ring 431. The limiting block 445 and several circumferentially evenly distributed limiting grooves 446 cooperate with each other to limit the rotation angle of the gear ring 431, so that the gear ring 431 can drive the driven gear 434 and the threaded column 41 to rotate a specific number of times each time, ensuring the vertical movement of the extrusion section 32 at the same height, and improving the accuracy of the fit between the extrusion section 32 and the die hole 21.

[0044] Please see Figure 2 , Figure 3 , Figure 6 and Figure 7 The second moving unit 5 includes a movable sleeve 51 rotatably mounted on the first driving ring 42. Inside the upper mold structure 1, two driving rings 52 are movably mounted vertically. The upper driving ring 52 is fixedly connected to the top of the first insert plate 33 via a connecting frame 1, and the lower driving ring 52 is fixedly connected to the top of the second insert plate 34 via a connecting frame 2. Several guide blocks 521 are evenly installed circumferentially on the outer ring wall of the second driving ring 52. The movable sleeve 51 is provided with guide grooves 511 and 512 corresponding to the guide blocks 521. The upper guide block 521 slides in cooperation with the guide groove 511, and the lower guide block 521 slides in cooperation with the guide groove 512. A rotating rod 53 is fixedly connected to the front side of the movable sleeve 51.

[0045] Please see Figure 3 , Figure 6 , Figure 7 and Figure 10 Guide groove 1 511 consists of a horizontal section and an inclined section connected to the right end of the horizontal section and sloping downwards. Guide groove 2 512 consists of a horizontal section and an inclined section connected to the left end of the horizontal section and sloping upwards. The inclined section of guide groove 1 511 is located above the horizontal section of guide groove 2 512. The horizontal section of guide groove 1 511 is located above the inclined section of guide groove 2 512.

[0046] During specific use, in the initial state, the bottoms of the first insert plate 33 and the second insert plate 34 are flush with the bottom of the lowermost forming part 322. At this time, the upper and lower guiding blocks 521 are respectively located at the rightmost ends of the first guiding groove 511 and the second guiding groove 512. When the shape of the extrusion section 32 needs to be switched, the rotating rod 53 is pushed to drive the movable sleeve 51 to rotate counterclockwise. By using the first guiding groove 511 and the second guiding groove 512 to guide the corresponding guiding blocks 521 respectively, the first insert plate 33 and the second insert plate 34 can move upward in sequence.

[0047] In the first stage, the inclined section of the first guiding groove 511 guides the upper guiding block 521 to move upward. The upper guiding block 521 drives the upper second driving ring 52 to move upward. The upper second driving ring 52 drives the first insert plate 33 to move upward through the first connecting frame. At the same time, the lower guiding block 521 will move in the horizontal section of the second guiding groove 512, and the lower guiding block 521 will not be guided by the second guiding groove 512 to move upward, so that the second insert plate 34 remains stationary. At this time, the extrusion section 32 is divided into two parts on the left and right, and the cavity between the extrusion section 32 and the die hole 21 is in the shape of a Chinese character 'Ri' (日), which is convenient for extruding aluminum profiles with a cross-section in the shape of a Chinese character 'Ri'.

[0048] In the second stage, when the first insert plate 33 completely moves to the top of the uppermost extrusion section 32, the upper guiding block 521 moves to the top end of the inclined section of the first guiding groove 511, and the lower guiding block 521 moves to the bottom end of the inclined section of the second guiding groove 512. At this time, the rotating rod 53 is continuously pushed to drive the movable sleeve 51 to rotate counterclockwise. The upper guiding block 521 will move in the horizontal section of the first guiding groove 511, so that the first insert plate 33 remains unchanged. The lower guiding block 521 will move upward under the guidance of the inclined section of the second guiding groove 512. The lower guiding block 521 drives the lower second driving ring 52 to move first, and the lower second driving ring 52 drives the second insert plate 34 to move upward through the second connecting frame. At this time, the extrusion section 32 is divided into four parts, and the cavity between the extrusion section 32 and the die hole 21 is in the shape of a Chinese character 'Tian' (田), which is convenient for extruding aluminum profiles with a cross-section in the shape of a Chinese character 'Tian'.

[0049] Please refer to Figure 1 On the outer ring wall of the upper die structure 1, an E-shaped movable groove 11 is provided, and the front end of the rotating rod 53 passes through the movable groove 11 to the outside of the upper die structure 1.

[0050] During specific use, when the height of the extrusion section 32 needs to be adjusted up and down, the rotating rod 53 needs to be moved to the vertical section at the leftmost side of the movable groove 11, and then the height of the extrusion section 32 can be adjusted up and down. When the extrusion section 32 moves up and down, the rotating rod 53 will move up and down synchronously, avoiding the movable groove 11 from obstructing the rotating rod 53. By observing the position of the rotating rod 53 at different horizontal sections of the upper, middle and lower parts of the movable groove 11, the position of the up and down movement of the extrusion section 32 can be judged, which is convenient for quickly knowing the wall thickness specification of the aluminum profile to be produced.

[0051] By observing the different positions of the rotating rod 53 on the left, center and right of the horizontal section of the movable slot 11, the position of the movable sleeve 51 after rotation can be determined, thereby knowing the upward movement of the first insert plate 33 and the second insert plate 34, which makes it easy to quickly know the cross-sectional shape of the aluminum profile to be produced.

[0052] Please see Figure 3 and Figure 8 The movable sleeve 51 is also equipped with a limiting component 2 54 to restrict its rotation. The limiting component 2 54 includes a movable frame 541 that is slidably mounted on the rotating rod 53. A positioning block 542 is fixedly connected to the bottom of the movable frame 541. A return spring 2 543 is fixedly connected between the bottom of the rotating rod 53 and the inner wall of the movable frame 541. A number of circumferentially evenly distributed positioning holes 544 are opened on the drive ring 42. The positioning block 542 is inserted into the positioning hole 544. A pressure rod 545 is slidably mounted on the rotating rod 53. The front end of the pressure rod 545 protrudes to the front of the rotating rod 53. A triangular plate 546 is fixedly connected to the top of the rear end of the pressure rod 545. The triangular plate 546 is slidably connected to the rotating rod 53 and its top end protrudes to the outside of the rotating rod 53. The inclined surface of the rear side of the triangular plate 546 is slidably engaged with the top edge of the movable frame 541.

[0053] In practical use, in the initial state, the positioning block 542 is inserted into the leftmost positioning hole 544. The positioning block 542 and the positioning hole 544 cooperate to position the movable frame 541. The movable frame 541 then limits the rotation rod 53 and the movable sleeve 51 to prevent the movable sleeve 51 from rotating, thereby improving the stability of the movable sleeve 51 and helping to maintain the accuracy of the fit between the first insert plate 33, the second insert plate 34 and the extrusion section 32.

[0054] To move the insert plate 33 upward, first press the pressure rod 545 backward. The pressure rod 545 drives the triangular plate 546 backward, and the inclined surface of the triangular plate 546 pushes the movable frame 541 upward. At this time, the return spring 543 is compressed and retracts. The movable frame 541 drives the positioning block 542 upward and separates from the positioning hole 544, releasing the positioning of the movable sleeve 51. Then, push the rotating rod 53 to drive the movable sleeve 51 to rotate counterclockwise. During the rotation, the pressure rod 545 is released. When pressed, the positioning block 542 slides against the top surface of the drive ring 42. When the movable sleeve 51 moves to the point where the insert plate 33 is completely above the extrusion section 32, the positioning block 542 moves to the next positioning hole 544. At this time, the return force of the reset spring 543 pushes the movable frame 541 downward, so that the positioning block 542 is inserted into the next positioning hole 544. The movable sleeve 51 is positioned by the circumferentially evenly distributed positioning holes 544 to prevent the movable sleeve 51 from rotating excessively.

[0055] When the second insert plate 34 is to be driven to move upward, repeat the above steps so that the movable sleeve 51 drives the second insert plate 34 to move upward. When the second insert plate 34 moves above the extrusion section 32, the positioning hole 544 limits the positioning block 542 again, so as to realize the accurate switching between the first insert plate 33 and the second insert plate 34.

[0056] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An aluminum profile variable cross-section extrusion die based on a retractable core structure, comprising, characterized in that: It includes an upper mold structure (1), a lower mold structure (2) and a mold hole (21) opened on the lower mold structure (2). A mold core structure (3) is movably installed at the bottom of the upper mold structure (1). A moving unit (4) is installed on the upper mold structure (1) to drive the mold core structure (3) to move up and down at a certain height. The core structure (3) includes a movable section (31) that is movably installed at the bottom of the upper mold structure (1). The bottom of the movable section (31) is fixedly connected with several extrusion sections (32) from top to bottom. The extrusion sections (32) gradually decrease in size from top to bottom. The extrusion sections (32) are in clearance fit with the mold hole (21). A cross-shaped through groove is opened on the several extrusion sections (32). The through groove passes through the movable section (31) upward. Insert plate one (33) and insert plate two (34) are slidably installed inside the through groove. The top of insert plate one (33) and the bottom of insert plate two (34) are both provided with grooves, and the grooves of the two are interlocked in a cross shape. The moving unit (4) includes threaded columns (41) that are rotatably installed inside the upper mold structure (1) and symmetrically distributed on the left and right sides. The two threaded columns (41) are connected by a common threaded drive ring (42). The upper mold structure (1) is also equipped with a moving unit two (5) that drives the first insert plate (33) and the second insert plate (34) to move upward in sequence. The moving unit two (5) includes a movable sleeve (51) rotatably mounted on the first drive ring (42). The upper mold structure (1) is equipped with two driving rings two (52) that are vertically distributed. The upper driving ring two (52) is fixedly connected to the top of the first insert plate (33) through a connecting frame one, and the lower driving ring two (52) is connected to the insert plate one (33) through a connecting frame two. The top of the second plate (34) is fixedly connected. Several guide blocks (521) are evenly installed on the outer ring wall of the second drive ring (52). The movable sleeve (51) is provided with guide groove 1 (511) and guide groove 2 (512) corresponding to the guide blocks (521). The upper guide block (521) is slidably engaged with guide groove 1 (511), and the lower guide block (521) is slidably engaged with guide groove 2 (512). A rotating rod (53) is fixedly connected to the front side of the movable sleeve (51). The first guide groove (511) consists of a horizontal section and an inclined section connected to the right end of the horizontal section and tilted downwards. The second guide groove (512) consists of a horizontal section and an inclined section connected to the left end of the horizontal section and tilted upwards. The inclined section of the first guide groove (511) is located above the horizontal section of the second guide groove (512), and the horizontal section of the first guide groove (511) is located above the inclined section of the second guide groove (512).

2. The aluminum profile variable cross-section extrusion die based on a retractable core structure according to claim 1, characterized in that: The extrusion section (32) includes guide parts (321) and forming parts (322) distributed vertically. The guide parts (321) gradually decrease in size from top to bottom. The forming parts (322) are fixedly connected to the bottom of the corresponding guide parts (321). The top of the uppermost guide part (321) is fixedly connected to the bottom of the movable section (31). The tops of the other guide parts (321) are fixedly connected to the bottom of the next-level forming part (322). The forming part (322) is clearance-fitted with the die hole (21).

3. The aluminum profile variable cross-section extrusion die based on a retractable core structure according to claim 1, characterized in that: The drive ring (42) is fixedly connected to the movable section (31) via a connecting rod, and the upper mold structure (1) is equipped with a drive assembly (43) for rotating the threaded column (41).

4. The aluminum profile variable cross-section extrusion die based on a retractable core structure according to claim 3, characterized in that: The drive assembly (43) includes a gear ring (431) rotatably mounted inside the upper mold structure (1), an internal hexagonal knob (432) rotatably mounted on the top of the upper mold structure (1), a drive gear (433) located inside the upper mold structure (1) being coaxially fixedly connected to the bottom of the internal hexagonal knob (432), the drive gear (433) meshing with the gear ring (431), and a driven gear (434) coaxially fixedly mounted on the threaded column (41), the driven gear (434) meshing with the gear ring (431).

5. The aluminum profile variable cross-section extrusion die based on a retractable core structure according to claim 4, characterized in that: The upper mold structure (1) is also equipped with a limiting component (44) for limiting the rotation of the gear ring (431). The limiting component (44) includes a movable rod (441) that is slidably mounted on the gear ring (431). A pressing block (442) is fixedly connected to the top of the movable rod (441). A return spring (443) is fixedly connected between the bottom of the pressing block (442) and the top of the gear ring (431). An arc-shaped groove (444) for the pressing block (442) to move is opened on the top of the upper mold structure (1). A limiting block (445) is fixedly connected to the front side of the pressing block (442). A plurality of circumferentially evenly distributed limiting grooves (446) are opened on the front side wall of the arc-shaped groove (444). The limiting block (445) and the limiting groove (446) are inserted into each other.

6. The aluminum profile variable cross-section extrusion die based on a retractable core structure according to claim 1, characterized in that: The upper mold structure (1) has an E-shaped movable groove (11) on its outer ring wall, and the front end of the rotating rod (53) passes through the movable groove (11) to the outside of the upper mold structure (1).

7. The aluminum profile variable cross-section extrusion die based on a retractable core structure according to claim 1, characterized in that: The movable sleeve (51) is also equipped with a limiting component two (54) to restrict its rotation. The limiting component two (54) includes a movable frame (541) that is slidably mounted on the rotating rod (53). A positioning block (542) is fixedly connected to the bottom of the movable frame (541). A return spring two (543) is fixedly connected between the bottom of the rotating rod (53) and the inner wall of the movable frame (541). A plurality of positioning holes (544) are evenly distributed in the circumferential direction on the drive ring one (42). The positioning block (542) is inserted into the positioning hole (544). A pressure rod (545) is slidably installed on the rotating rod (53). The front end of the pressure rod (545) protrudes to the front of the rotating rod (53). A triangular plate (546) is fixedly connected to the top of the rear end of the pressure rod (545). The triangular plate (546) is slidably connected to the rotating rod (53) and its top end protrudes to the outside of the rotating rod (53). The inclined surface on the rear side of the triangular plate (546) is slidably engaged with the top edge of the movable frame (541).

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