Single-door-frame rolling mill equipment for manufacturing fireproof door

The single door frame rolling mill device addresses the issue of iron filings by using pneumatic cylinders and brushes to clean molds and surfaces, ensuring continuous production and improved fire door quality.

CN119159004AInactive Publication Date: 2024-12-20JIANGXI HONGXING FIRE FIGHTING EQUIP CO LTD
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Patent Information

Application Number
CN202411397281.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-09
Publication Date
2024-12-20
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The generation of iron filings on the workbench during the production of fire doors necessitates frequent machine stops for cleaning, and these filings can be squeezed onto the material surface during extrusion, affecting the process.

Method used

A single door frame rolling mill device equipped with pneumatic cylinders, molds, sliding assemblies, and brushes that utilize a mechanism of gears and bevel gears to automatically clean the molds and material surfaces by sliding brushes to prevent iron filings from adhering.

Benefits of technology

The device effectively prevents iron filings from sticking to the material surface by continuously cleaning the molds and surfaces, ensuring uninterrupted production and improved quality of fire doors.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses single-door-frame rolling mill equipment for fireproof door manufacturing. A sliding groove is formed in the bottom of a fixing column, a screw rod is rotationally connected into the fixing column, a second bevel gear is fixed to the head end of the screw rod, a first bevel gear meshed with the second bevel gear is arranged at the top of the second bevel gear, and a second gear is fixed to the top of the first bevel gear; a third fixing column is arranged at the tail end of the outer side of the screw rod, the outer side of the third fixing column is slidably connected with the interior of a sliding groove, a second sliding groove is formed in one end of the third fixing column, the third fixing column is slidably connected with the interior of the second sliding groove, and springs are connected to the top end of the interior of the second sliding groove and the top of the third fixing column; according to the device, the screw rod rotates to drive the second fixing column to slide through the sliding groove, the second fixing column can drive the brushes to slide far away, and therefore the top of a second mold and the bottom of a material are wiped, and scrap iron is prevented from being attached to the surface of the second mold and the bottom of the material.
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Description

Technical Field

[0001] The invention relates to the field of single door frame rolling mill equipment for producing fireproof doors, in particular to single door frame rolling mill equipment for producing fireproof doors. Background Art

[0002] Fire doors are mainly used to isolate fire in key fire-fighting areas. Fire doors are a type of door, so their function is like ordinary doors, with the function of separation and protection. However, fire doors are different from other doors in that they can prevent the spread of fire and smoke, and can prevent the spread of fire within a certain period of time to ensure the evacuation of personnel. If fire doors are installed, they play an important role in suppressing the spread of fire and protecting the safe evacuation of personnel in the event of a fire.

[0003] When making fire doors, a machine in the single door frame rolling mill equipment is used to extrude certain grooves on the surface of the material that needs to be rolled, and then the metal sheet is curled into a square through the curling device of the machine to form the shape of the door frame.

[0004] When the grooves are extruded, a certain amount of iron filings will be generated on the workbench. When there are too many iron filings, the machine needs to be stopped for cleaning. When the grooves are extruded, the surface of the material will contact the iron filings on the workbench, causing the iron filings to be squeezed onto the surface of the material during extrusion. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a single door frame rolling mill equipment for the production of fire doors, so as to solve the technical problem that a certain amount of iron filings are generated on the workbench, and when there are too many iron filings, the machine needs to be stopped for cleaning, and when the grooves are extruded, the surface of the material will contact the iron filings in the workbench, causing the iron filings to be squeezed onto the surface of the material while extruding.

[0006] To achieve the above object, the present invention provides the following technical solution: a single door frame rolling mill device for making fireproof doors, comprising a main body, wherein a plurality of groups of pneumatic cylinders are arranged inside the main body, a No. 1 mold is fixed to the output end of the pneumatic cylinder, and a No. 2 sliding assembly is arranged on one side of the No. 1 mold;

[0007] The second sliding assembly is provided with a fixed column, a sliding groove is provided at the bottom of the fixed column, a screw is rotatably connected inside the fixed column, a second bevel gear is fixed at the head end of the screw, a meshing first bevel gear is provided at the top of the second bevel gear, and a second gear is fixed at the top of the first bevel gear;

[0008] A No. 3 fixing column is provided at the end of the outer side of the screw rod, and the outer side of the No. 3 fixing column is slidably connected to the inside of a slide groove, a No. 2 slide groove is provided at one end of the No. 3 fixing column, and the inside of the No. 2 slide groove is slidably connected to the No. 3 fixing column, the top of the inside of the No. 2 slide groove and the top of the No. 3 fixing column are connected with a spring, and the top and bottom of the middle part of the No. 3 fixing column are fixed with brushes.

[0009] The present invention is further configured that a fixing plate is provided at the bottom of the first mold, and transmission components are provided at the four corners of the top of the fixing plate;

[0010] The transmission assembly is provided with a No. 1 rotating shaft, and the No. 1 rotating shaft is fixed to the four corners of the top of the fixed plate. A cylinder is provided at the top of the outer side of the No. 1 rotating shaft, and the top of the cylinder is fixedly connected to the bottom of the No. 1 mold. The bottom of one end of the No. 1 rotating shaft is provided with teeth, and the bottom of the outer side of the No. 1 rotating shaft is provided with threads. A fixing ring is fixed to the outer side of the cylinder, and an annular groove is provided at the bottom of the cylinder.

[0011] The present invention is further configured that a first sliding component is provided at one end of the fixing ring;

[0012] The No. 1 sliding assembly is provided with a No. 1 gear, and the No. 1 gear is rotatably connected to one end of a fixed ring, a No. 2 rotating shaft is fixedly connected to one side of the No. 1 gear, a No. 3 rotating shaft is fixed to the end of the No. 2 rotating shaft, a curved groove is provided on the outer side of the No. 3 rotating shaft, a No. 2 tooth is provided in the middle position of the curved groove, and the interior of the curved groove is slidably connected to the No. 2 gear.

[0013] The present invention is further configured such that a rotating assembly is provided at the bottom of the annular groove;

[0014] The rotating assembly is provided with a circular ring, which is rotatably connected to the inside of the annular groove. A gear ring is fixed to the bottom end of the circular ring, and a plurality of groups of No. 2 brushes are provided at the bottom of the gear ring.

[0015] The present invention is further configured as follows: a fixed plate is provided on the top of one side of the main body, a plurality of groups of No. 3 slide grooves are provided at one end of the fixed plate, a No. 3 slider is slidably connected inside the No. 3 slide groove, a No. 2 screw is provided on the top of the No. 3 slider, one end of the No. 3 slider is rotatably connected to a No. 1 roller, and a No. 2 roller is rotatably connected to the bottom of the No. 1 roller.

[0016] The present invention is further configured such that a No. 2 rotating assembly is provided at both ends of the top of the fixed plate, and the No. 2 rotating assembly has the same parts as the rotating assembly.

[0017] The present invention is further configured such that four corners of the top of the No. 1 mold are each provided with a No. 1 circular hole, both ends of the top of the No. 1 mold are each provided with a plurality of groups of No. 2 circular holes, and the top of the No. 1 rotating shaft is slidably connected to the inside of the No. 1 circular hole.

[0018] The present invention is further configured such that a No. 2 mold is provided in the middle of the top of the fixed plate, an opening is provided in the middle of the top of the No. 2 mold, the middle of the fixed plate is provided with the same opening as that in the No. 2 mold, and a discharge port is provided on the other side of the main body.

[0019] In summary, the present invention mainly has the following beneficial effects:

[0020] The pneumatic cylinder is used to reset and drive the No. 1 mold, and the No. 1 mold drives the fixed ring to move upward, and the fixed ring drives the No. 1 gear to move upward. When the No. 1 gear moves upward, it drives the No. 1 gear to rotate through the teeth, and the No. 1 gear drives the No. 2 rotating shaft to rotate, and the No. 2 rotating shaft drives the No. 3 rotating shaft to rotate, and the No. 3 rotating shaft drives the curved groove to rotate, and the rotation of the curved groove drives the internal No. 2 gear to slide, and the No. 2 gear drives the fixed column to slide, and the fixed column drives the No. 2 fixed column to slide, and the No. 2 fixed column drives the brush in the No. 3 fixed column to slide, and when the No. 2 gear slides to the middle of the curved groove, it meshes with the No. 2 teeth inside the curved groove, so that the No. 2 gear rotates, and the No. 2 gear drives the No. 1 bevel gear to rotate, and the No. 1 bevel gear drives the No. 2 bevel gear to rotate, and the No. 2 bevel gear drives the screw to rotate, and the screw rotation drives the No. 2 fixed column to slide through the slide groove, so that the No. 2 fixed column can drive the brush to slide farther, so as to wipe the top of the No. 2 mold and the bottom of the material to prevent iron filings from sticking to its surface;

[0021] When mold No. 1 moves downward, it drives the gear ring, which moves and rotates downward through the thread. The gear ring drives the No. 2 brush to move and rotate downward to clean the bottom end of the No. 1 rotating shaft. When mold No. 1 moves downward, it drives the No. 2 rotating assembly to clean the surface of the fixed plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall extrusion structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the transmission assembly structure of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a sliding assembly No. 1 of the present invention;

[0025] Figure 4 It is a schematic diagram of the gear ring structure of the present invention;

[0026] Figure 5 This is a schematic structural diagram of the second sliding assembly of the present invention;

[0027] Figure 6 It is a schematic diagram of the screw structure of the present invention.

[0028] In the figure: 1, main body; 2, pneumatic cylinder; 3, mold No. 1; 301, round hole No. 1; 302, round hole No. 2; 4, fixed plate; 5, transmission assembly; 501, rotating shaft No. 1; 502, cylinder; 503, teeth; 504, thread; 505, annular groove; 506, fixing ring; 6, discharge port; 7, sliding assembly No. 1; 701, gear No. 1; 702, rotating shaft No. 2; 703, rotating shaft No. 3; 704, curved groove; 705, teeth No. 2; 8, sliding assembly No. 2; 801, gear No. 2; 802, fixing column; 803, sliding Groove; 804, screw; 805, bevel gear No. 1; 806, bevel gear No. 2; 807, fixed column No. 2; 808, slide groove No. 2; 809, spring; 810, fixed column No. 3; 811, brush; 9, rotating assembly; 901, gear ring; 902, ring; 903, brush No. 2; 10, mold No. 2; 1001, opening; 11, fixed plate; 1101, slide groove No. 3; 1102, slider No. 3; 1103, screw No. 2; 1104, roller No. 1; 1105, roller No. 2; 12, rotating assembly No. 2. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] The following describes an embodiment of the present invention based on its overall structure.

[0031] A single door frame rolling mill equipment for making fire doors, such as Figure 3 , 5 As shown in 6, it comprises a main body 1, wherein a plurality of pneumatic cylinders 2 are arranged inside the main body 1, a No. 1 mold 3 is fixed to the output end of the pneumatic cylinder 2, and a No. 2 sliding assembly 8 is arranged on one side of the No. 1 mold 3;

[0032] The second sliding assembly 8 is provided with a fixed column 802, a slide groove 803 is provided at the bottom of the fixed column 802, a screw rod 804 is rotatably connected inside the fixed column 802, a second bevel gear 806 is fixed at the head end of the screw rod 804, a first bevel gear 805 meshing with the second bevel gear 806 is provided at the top of the second bevel gear 806, and a second gear 801 is fixed at the top of the first bevel gear 805;

[0033] A No. 3 fixing column 807 is provided at the end of the outer side of the screw rod 804, and the outer side of the No. 3 fixing column 807 is slidably connected to the inside of the slide groove 803, and one end of the No. 3 fixing column 807 is provided with a No. 2 slide groove 808, and the inside of the No. 2 slide groove 808 is slidably connected to the No. 3 fixing column 810, and the top of the inside of the No. 2 slide groove 808 and the top of the No. 3 fixing column 810 are connected with a spring 809, and the top and bottom of the middle of the No. 3 fixing column 810 are fixed with brushes 811.

[0034] It should be noted that, by sliding the No. 2 gear 801, the No. 2 gear 801 drives the fixed column 802 to slide, the fixed column 802 drives the No. 2 fixed column 807 to slide, and the No. 2 fixed column 807 drives the brush 811 in the No. 3 fixed column 810 to slide. When the No. 2 gear 801 slides to the middle of the curved groove 704, it meshes with the No. 2 tooth 705 inside the curved groove 704, so that the No. 2 gear 801 rotates, the No. 2 gear 801 drives the No. 1 bevel gear 805 to rotate, the No. 1 bevel gear 805 drives the No. 2 bevel gear 806 to rotate, the No. 2 bevel gear 806 drives the screw 804 to rotate, and the rotation of the screw 804 drives the No. 2 fixed column 807 to slide through the slide groove 803, so that the No. 2 fixed column 807 can drive the brush 811 to slide farther, thereby wiping the top of the No. 2 mold 10 and the bottom of the material to prevent iron filings from sticking to their surfaces.

[0035] Please pay attention to Figure 2 , 3 A fixing plate 4 is provided at the bottom of the first mold 3, and transmission components 5 are provided at the four corners of the top of the fixing plate 4;

[0036] The transmission assembly 5 is provided with a No. 1 rotating shaft 501, and the No. 1 rotating shaft 501 is fixed to the four corners of the top of the fixed plate 4. A cylinder 502 is provided on the top of the outer side of the No. 1 rotating shaft 501, and the top of the cylinder 502 is fixedly connected to the bottom of the No. 1 mold 3. A tooth 503 is provided on the bottom of one end of the No. 1 rotating shaft 501, and a thread 504 is provided on the bottom of the outer side of the No. 1 rotating shaft 501. A fixing ring 506 is fixed to the outer side of the cylinder 502, and an annular groove 505 is provided on the bottom of the cylinder 502.

[0037] It can be understood that the fixed ring 506 is driven to move upward by the first mold 3, and the fixed ring 506 drives the first gear 701 to move upward.

[0038] Please pay attention to Figure 3 , a first sliding component 7 is provided at one end of the fixing ring 506;

[0039] The first sliding assembly 7 is provided with a first gear 701, and the first gear 701 is rotatably connected to one end of the fixing ring 506, and a second rotating shaft 702 is fixedly connected to one side of the first gear 701, and a third rotating shaft 703 is fixed to the end of the second rotating shaft 702, and a curved groove 704 is provided on the outer side of the third rotating shaft 703, and a second tooth 705 is provided in the middle of the curved groove 704;

[0040] The interior of the curved groove 704 is slidably connected to the second gear 801 .

[0041] It should be noted that the first gear 701 drives the second shaft 702 to rotate, the second shaft 702 drives the third shaft 703 to rotate, the third shaft 703 drives the curved groove 704 to rotate, and the rotation of the curved groove 704 drives the internal second gear 801 to slide.

[0042] Please pay attention to Figure 1 , 2 3. A rotating assembly 9 is provided at the bottom of the annular groove 505;

[0043] The rotating component 9 is provided with a circular ring 902, and the circular ring 902 is rotatably connected to the inside of the annular groove 505. A gear ring 901 is fixed to the bottom end of the circular ring 902, and multiple groups of No. 2 brushes 903 are provided at the bottom of the gear ring 901. A fixed plate 11 is provided at the top of one side of the main body 1, and multiple groups of No. 3 slide grooves 1101 are provided at one end of the fixed plate 11. A No. 3 slider 1102 is slidably connected to the inside of the No. 3 slide groove 1101, and a No. 2 screw 1103 is provided on the top of the No. 3 slider 1102. One end of the No. 3 slider 1102 is rotatably connected to the No. 1 roller 1104, and the bottom of the No. 1 roller 1104 is rotatably connected to the No. 2 roller 1105.

[0044] It can be understood that one end of the material is passed through the first roller 1104 and the second roller 1105 and then into the main body 1 .

[0045] Please pay attention to Figure 1 A No. 2 rotating assembly 12 is provided at both ends of the top of the fixed plate 4, and the No. 2 rotating assembly 12 has the same parts as the rotating assembly 9. A No. 1 round hole 301 is provided at the four corners of the top of the No. 1 mold 3, and a plurality of groups of No. 2 round holes 302 are provided at both ends of the top of the No. 1 mold 3. The top of the No. 1 rotating shaft 501 is slidably connected with the inside of the No. 1 round hole 301. A No. 2 mold 10 is provided in the middle of the top of the fixed plate 4, and an opening 1001 is provided in the middle of the top of the No. 2 mold 10. The middle of the fixed plate 4 is provided with the opening 1001 in the No. 2 mold 10, and a discharge port 6 is provided on the other side of the main body 1.

[0046] It can be understood that the pneumatic cylinder 2 pushes the mold 3 to move downward, so that the mold 3 extrude the materials in the mold 3 and the mold 10 into the shape of the opening 1001.

[0047] Working principle: one end of the material passes through the No. 1 roller 1104 and the No. 2 roller 1105, enters the main body 1, passes through multiple sets of No. 1 molds 3 and No. 2 molds 10, passes through the discharge port 6, and pushes the No. 1 mold 3 downward through the pneumatic cylinder 2, so that the No. 1 mold 3 extrude the materials in the No. 1 mold 3 and the No. 2 mold 10 into the shape of the opening 1001;

[0048] After the No. 1 mold 3 is extruded and formed, the pneumatic cylinder resets and drives the No. 1 mold 3, and the No. 1 mold 3 drives the fixed ring 506 to move upward. The fixed ring 506 drives the No. 1 gear 701 to move upward. When the No. 1 gear 701 moves upward, it drives the No. 1 gear 701 to rotate through the teeth 503, and the No. 1 gear 701 drives the No. 2 rotating shaft 702 to rotate, and the No. 2 rotating shaft 702 drives the No. 3 rotating shaft 703 to rotate, and the No. 3 rotating shaft 703 drives the curved groove 704 to rotate, and the rotation of the curved groove 704 drives the internal No. 2 gear 801 to slide, and the No. 2 gear 801 drives the fixed column 802 to slide, and the fixed column 802 drives the No. 2 fixed column 807 to slide, and the No. 2 fixed column 807 drives The brush 811 in the third fixed column 810 slides, and when the second gear 801 slides to the middle of the curved groove 704, it meshes with the second tooth 705 inside the curved groove 704, so that the second gear 801 rotates, and the second gear 801 drives the first bevel gear 805 to rotate, and the first bevel gear 805 drives the second bevel gear 806 to rotate, and the second bevel gear 806 drives the screw 804 to rotate, and the rotation of the screw 804 drives the second fixed column 807 to slide through the slide groove 803, so that the second fixed column 807 can drive the brush 811 to slide farther, so as to wipe the top of the second mold 10 and the bottom of the material to prevent iron filings from sticking to their surfaces;

[0049] When mold No. 1 3 moves downward, it drives the gear ring 901, which moves and rotates downward through the thread 504. The gear ring 901 drives the second brush 903 to move and rotate downward to clean the bottom end of the first rotating shaft 501. When mold No. 1 3 moves downward, it drives the second rotating component 12 to clean the surface of the fixed plate.

[0050] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A single door frame rolling mill device for making fireproof doors, comprising a main body (1), Features: A plurality of groups of pneumatic cylinders (2) are arranged inside the main body (1), a No. 1 mold (3) is fixed to the output end of the pneumatic cylinder (2), and a No. 2 sliding assembly (8) is arranged on one side of the No. 1 mold (3); The second sliding assembly (8) comprises a second gear (801), a fixed column (802), a slide groove (803), a screw (804), a first bevel gear (805), a second bevel gear (806), a third fixed column (807), a second slide groove (808), a spring (809), a third fixed column (810), and a brush (811); A third fixing column (807) is provided at the end of the outer side of the screw rod (804), and the outer side of the third fixing column (807) is slidably connected to the inside of the slide groove (803), and a second slide groove (808) is provided at one end of the third fixing column (807), and the inside of the second slide groove (808) is slidably connected to the third fixing column (810), and the top of the inside of the second slide groove (808) and the top of the third fixing column (810) are connected with a spring (809), and the top and bottom of the middle of the third fixing column (810) are fixed with brushes (811).

2. A single door frame rolling mill for making fire doors according to claim 1, Features: A slide groove (803) is provided at the bottom of the fixed column (802), a screw rod (804) is rotatably connected inside the fixed column (802), a second bevel gear (806) is fixed at the head end of the screw rod (804), a first bevel gear (805) meshing with the second bevel gear (806) is provided at the top of the second bevel gear (806), and a second gear (801) is fixed at the top of the first bevel gear (805).

3. A single door frame rolling mill for making fire doors according to claim 1, Features: A fixing plate (4) is provided at the bottom of the first mold (3), and transmission components (5) are provided at the four corners of the top of the fixing plate (4); The transmission assembly (5) comprises a first rotating shaft (501), a cylinder (502), teeth (503), threads (504), an annular groove (505), and a fixing ring (506); The No. 1 rotating shaft (501) is fixed to the four corners of the top of the fixed plate (4); a cylinder (502) is arranged on the top of the outer side of the No. 1 rotating shaft (501); the top of the cylinder (502) is fixedly connected to the bottom of the No. 1 mold (3); teeth (503) are arranged on the bottom of one end of the No. 1 rotating shaft (501); a thread (504) is arranged on the bottom of the outer side of the No. 1 rotating shaft (501); a fixing ring (506) is fixed on the outer side of the cylinder (502); and an annular groove (505) is arranged on the bottom of the cylinder (502).

4. A single door frame rolling mill for making fire doors according to claim 3, Features: A first sliding component (7) is provided at one end of the fixing ring (506); The first sliding assembly (7) comprises a first gear (701), a second rotating shaft (702), a third rotating shaft (703), a curved groove (704), and a second tooth (705); The first gear (701) is rotatably connected to one end of the fixed ring (506); a second rotating shaft (702) is fixedly connected to one side of the first gear (701); a third rotating shaft (703) is fixed to the end of the second rotating shaft (702); a curved groove (704) is arranged on the outer side of the third rotating shaft (703); and a second tooth (705) is arranged in the middle of the curved groove (704); The interior of the curved groove (704) is slidably connected to the second gear (801).

5. A single door frame rolling mill for making fire doors according to claim 3, Features: A rotating assembly (9) is provided at the bottom of the annular groove (505); The rotating assembly (9) comprises a gear ring (901), a circular ring (902), and a second brush (903); The circular ring (902) is rotatably connected to the inside of the annular groove (505), a gear ring (901) is fixed to the bottom end of the circular ring (902), and a plurality of groups of No. 2 brushes (903) are arranged at the bottom of the gear ring (901).

6. A single door frame rolling mill for making fire doors according to claim 1, Features: A fixing plate (11) is arranged at the top of one side of the main body (1), and a plurality of groups of No. 3 slide grooves (1101) are arranged at one end of the fixing plate (11), a No. 3 slider (1102) is slidably connected inside the No. 3 slide groove (1101), a No. 2 screw rod (1103) is arranged at the top of the No. 3 slider (1102), one end of the No. 3 slider (1102) is rotatably connected to a No. 1 roller (1104), and a No. 2 roller (1105) is rotatably connected to the bottom of the No. 1 roller (1104).

7. A single door frame rolling mill for making fire doors according to claim 1, Features: A second rotating assembly (12) is provided at both ends of the top of the fixed plate (4), and the second rotating assembly (12) has the same parts as the rotating assembly (9).

8. A single door frame rolling mill for making fire doors according to claim 1, Features: The four corners of the top of the No. 1 mold (3) are each provided with a No. 1 circular hole (301), and both ends of the top of the No. 1 mold (3) are each provided with a plurality of groups of No. 2 circular holes (302), and the top of the No. 1 rotating shaft (501) is slidably connected to the inside of the No. 1 circular hole (301).