A rotary head mechanism for forming a double-screw co-extruded plastic mesh

Abstract

The present invention relates to the technical field of plastic molding, and specifically relates to a rotary head mechanism for the molding of double-machine co-extruded plastic mesh materials; it includes an extrusion head and an annular extrusion outlet on the lower surface of the extrusion head; a center rod is fixedly connected to the center of the lower surface of the extrusion head; after the mesh material is extruded from the extrusion outlet on the lower surface of the extrusion head, it enters the outside of the center rod; an annular groove is arranged at a position above the outer wall of the center rod; an upper support piece is movably connected along the circumferential direction in the annular groove; an expansion plate is arranged around the annular groove on the outer wall of the center rod; a plurality of the expansion plates are arranged adjacent to and in contact with each other, and the outer walls are transitionally arranged in an arc shape; in the present invention, by inserting corresponding number of supplementary plates into the gaps between a plurality of expansion plates, all the expansion plates and the inserted supplementary plates form a new expanded outer wall, thereby meeting the expansion requirements of different diameters, and enabling the mesh materials of different diameters to be formed after being extruded from the extrusion head and expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic molding, and specifically relates to a rotary head mechanism for the formation of double-extrusion plastic net materials. Background Art

[0002] In the plastic processing industry, plastic net materials are widely used in many fields such as aquaculture, poultry farming, agricultural packaging, civil construction, and garden and stadium guard nets due to their advantages of light weight, durability, and versatility. With the diversification and functionalization of the market demand for plastic net materials, the traditional single-material extrusion molding technology has gradually been unable to meet the growing performance requirements. For example, the net materials made of a single material have certain limitations in terms of weather resistance, strength, flexibility, etc., and it is difficult to meet the requirements of multiple application scenarios at the same time.

[0003] The double-material, that is, the double-extrusion technology, has emerged as the times require and has become an important means to improve the performance of plastic net materials. The double-material co-extrusion technology can produce net materials with composite properties and multiple colors by simultaneously conveying two different plastic raw materials or raw materials of different colors to the extrusion head and mixing and extruding them inside the head.

[0004] Among them, the head mechanism includes an extrusion head at the upper position and a dilation head at the lower position; the extrusion head in the head mechanism extrudes the molten material into filaments continuously from the small holes of the inner and outer die orifices of the rotary head by the rotation of the inner and outer die orifices of the rotary head; when the small holes on the die orifice are separated by the rotation of the inner and outer die orifices, it becomes a net strip, and when the small holes coincide, it becomes a net. By the rotation of the head, the small holes are continuously separated and coincided, and a continuously extruded net is obtained. The extrusion head in the head mechanism will extrude the net material and sleave it on the outside of the dilation head and move it down. The outer diameter of the dilation head is larger than the inner diameter of the net material extruded from the extrusion head, so that the net material is expanded after passing through the dilation head. However, the existing outer diameter of the dilation head is constant, so that the diameter of the net material formed by the head mechanism is single. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art, the present invention provides a rotary head mechanism for the formation of double-extrusion plastic net materials. By inserting a corresponding number of supplementary plates into the gaps between multiple dilation plates, all the dilation plates and the inserted supplementary plates form a new dilation outer wall, so as to meet the dilation requirements of different diameters, and make the net materials with different diameters formed after being extruded from the extrusion head and expanded.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A rotary head mechanism for forming a double-extrusion plastic mesh material according to the present invention includes an extrusion head and an annular extrusion outlet on the lower surface of the extrusion head; a central rod is fixedly connected to the center of the lower surface of the extrusion head; after the mesh material is extruded from the extrusion outlet on the lower surface of the extrusion head, it enters the outside of the central rod; an annular groove is provided at a position close to the upper part of the outer wall of the central rod; an upper support piece is movably connected along the circumferential direction in the annular groove; an expansion plate is arranged around the annular groove on the outer wall of the central rod; a plurality of the expansion plates are arranged adjacent to and in contact with each other, and the outer walls are transitioned in an arc shape; an upper support groove is provided on one side of the expansion plate facing the central rod; the upper support piece is slidably connected in the corresponding upper support groove; the upper support piece is connected to the bottom of the upper support groove through a first tension spring; a vertical groove is provided at a position close to the lower part of the outer wall of the central rod; a plurality of the vertical grooves are distributed around the central rod; a lower support strip is slidably connected up and down in the vertical groove; a supplementary plate is distributed at a position close to the lower part of the outer wall of the central rod; the arc-shaped outer wall of the supplementary plate is adapted to the arc-shaped outer wall of the expansion plate; a lower support groove is provided on one side of the supplementary plate close to the central rod; the lower support strip is slidably connected in the lower support groove; the lower support strip is connected to the bottom of the lower support groove through a second tension spring; the lower support strip is connected to the lower end of the supplementary plate; the vertical length of the supplementary plate is greater than the vertical length of the expansion plate; the tension of the first tension spring is equal to the tension of the second tension spring.

[0007] Preferably, an upper guiding surface is provided at the circumferential position of the lower end of the expansion plate; a lower guiding block is fixedly connected to the upper end of the supplementary plate; a lower guiding surface is provided at the circumferential position of the upper end of the lower guiding block; the upper end of the lower guiding block can enter the gap between the adjacent lower ends of the expansion plates.

[0008] Preferably, an upper guiding block is fixedly connected to the upper end of the expansion plate; the arc-shaped outer walls of the upper guiding block and the lower guiding block are arranged close to the central rod from bottom to top; the upper support piece is slidably and sealingly connected to the upper support groove; the bottom of the upper support groove is communicated with the upper end of the upper guiding block through an upper hole; the upper holes at the upper ends of two adjacent upper guiding blocks are connected through an elastic tube; the elastic force of the elastic tube is greater than the tension of the first tension spring.

[0009] Preferably, a locking groove is provided on the side of the vertical groove close to the center of the central rod; the distance from the locking groove to the upper end of the vertical groove is equal to the vertical height of the lower support strip; a threaded cavity is provided on the lower surface of the central rod; a plug is threadedly and sealingly connected in the threaded cavity; a liquid medium is filled in the threaded cavity; a locking block is slidably and sealingly connected in the locking groove; the upper end of the threaded cavity is communicated with the bottom of the locking groove through a lower hole.

[0010] Preferably, an annular anti-rotation groove is provided at the bottom of the annular groove; an elastic bladder with the same specification and shape is arranged in the anti-rotation groove; the bottom of the anti-rotation groove is communicated with the upper end of the threaded cavity through a first liquid hole.

[0011] Preferably, an upper linkage block is provided at a position near the lower part of one outer wall in the circumferential direction of the expansion plate; an upper linkage groove with a downward opening is provided at the other outer wall in the circumferential direction of the expansion plate; a lower linkage block is provided at a position near the upper part of one outer wall in the circumferential direction of the supplementary plate; a lower linkage groove with an upward opening is provided at the other outer wall in the circumferential direction of the supplementary plate.

[0012] Preferably, the opening of the upper linkage groove decreases from bottom to top; the opening of the lower linkage groove decreases from top to bottom; an upper expansion hole is provided at a position corresponding to the upper linkage block on the outer wall of the expansion plate; the upper linkage block is slidably connected in the upper expansion hole; the upper linkage block is connected to the bottom of the upper expansion hole through a first spring; a lower expansion hole is provided at a position corresponding to the lower linkage block on the outer wall of the supplementary plate; the lower linkage block is slidably connected in the lower expansion hole; the lower linkage block is connected to the bottom of the lower expansion hole through a second spring.

[0013] Preferably, a flexible rope is provided in the locking groove; one end of the flexible rope is connected to the bottom of the locking groove, and the other end is connected to one end of the locking block close to the bottom of the locking groove; the locking block cannot move out through the vertical groove to the outside under the limitation of the flexible rope.

[0014] Preferably, an upward movement groove is provided at the lower end of the vertical groove in an upward direction; an upward movement strip is slidably and sealingly connected in the upward movement groove; the bottom of the upward movement groove is communicated with the threaded cavity through a second liquid hole.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, by inserting the corresponding number of supplementary plates into the gaps between multiple expansion plates, all the expansion plates and the inserted supplementary plates form a new expanded outer wall, thereby meeting the expansion requirements of different diameters, and enabling the net materials extruded from the extrusion head and expanded to form net materials with different diameters.

[0017] 2. Since all the upper support grooves in the present invention are communicated through elastic tubes, the gas pressures in all the upper support grooves are kept consistent. After the air pressures in all the upper support grooves are the same, the distances of the upper support sheets from the bottoms of the upper support grooves are the same. In this way, the degrees of outward expansion of all the expansion plates are the same, and thus the new expanded outer wall is more regular, facilitating the expansion molding of the net materials.

[0018] 3. During the upward movement of the plug in the present invention, the liquid medium in the threaded cavity will be squeezed, and part of the liquid medium will enter the locking groove along the lower hole, thereby squeezing the locking block in the locking groove, causing the locking block to partially extend out of the locking groove and move to cross below the lower support bar of the locking groove, realizing the limitation of the lower support bar. In this way, the downward movement of the lower support bar and the supplementary plate is prevented from affecting the diameter and integrity of the expanded outer wall, making the expanded outer wall more stable during the expansion of the net materials. Description of the Drawings

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 is a perspective view of the present invention;

[0021] Figure 2 is a position diagram of the extrusion outlet of the present invention;

[0022] Figure 3 is a cross-sectional view of the present invention;

[0023] Figure 4 is Figure 3 an enlarged view of part A in

[0024] Figure 5 is Figure 3 an enlarged view of part B in

[0025] Figure 6 is Figure 3 an enlarged view of part C in

[0026] Figure 7 is a perspective view of the expansion plate and the supplementary plate in the present invention;

[0027] Figure 8 is a position diagram of the annular groove and the vertical groove in the present invention;

[0028] Figure 9 is a schematic diagram of the cooperation between the expansion plate and the elastic capsule in the present invention;

[0029] Figure 10 is a cross-sectional view of the supplementary plate in the present invention.

[0030] In the figure: extrusion head 1, extrusion outlet 11, central rod 2, annular groove 21, vertical groove 22, locking groove 23, threaded cavity 24, plug 25, lower hole 26, anti-rotation groove 27, upward movement groove 28, upper support piece 3, first tension spring 31, expansion plate 4, upper support groove 41, upper guide surface 42, upper guide block 43, upper hole 44, elastic tube 45, upper linkage block 46, upper linkage groove 47, upper telescopic hole 48, first spring 49, lower support strip 5, second tension spring 51, supplementary plate 6, lower support groove 61, lower guide block 62, lower guide surface 63, lower linkage block 64, lower linkage groove 65, lower telescopic hole 66, second spring 67, locking block 7, flexible rope 71, elastic capsule 8, first liquid hole 81, upward movement strip 9, second liquid hole 91. Specific Embodiments

[0031] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments. As Figures 1 to 10 shown, the present invention includes the following embodiments:

[0032] Embodiment 1: A rotary head mechanism for forming a double-machine co-extruded plastic mesh material, comprising an extrusion head 1 and an annular extrusion port 11 on the lower surface of the extrusion head 1; a center rod 2 is fixedly connected to the center of the lower surface of the extrusion head 1; after the mesh material is extruded from the extrusion port 11 on the lower surface of the extrusion head 1, it enters the outside of the center rod 2; an annular groove 21 is arranged at a position on the outer wall of the center rod 2 close to the upper part; an upper support piece 3 is movably connected along the circumferential direction in the annular groove 21; an expansion plate 4 is arranged on the outer wall of the center rod 2 around the annular groove 21; a plurality of the expansion plates 4 are arranged adjacent to and in contact with each other, and the outer walls are transitioned in an arc shape; an upper support groove 41 is arranged on one side of the expansion plate 4 facing the center rod 2; the upper support piece 3 is slidably connected in the corresponding upper support groove 41; the upper support piece 3 is connected to the bottom of the upper support groove 41 through a first tension spring 31; a vertical groove 22 is arranged at a position on the outer wall of the center rod 2 close to the lower part; a plurality of the vertical grooves 22 are distributed around the center rod 2; a lower support strip 5 is slidably connected up and down in the vertical groove 22; a supplementary plate 6 is distributed at a position on the outer wall of the center rod 2 close to the lower part; the arc-shaped outer wall of the supplementary plate 6 is adapted to the arc-shaped outer wall of the expansion plate 4; a lower support groove 61 is arranged on one side of the supplementary plate 6 close to the center rod 2; the lower support strip 5 is slidably connected in the lower support groove 61; the lower support strip 5 is connected to the bottom end of the supplementary plate 6; the vertical length of the supplementary plate 6 is greater than the vertical length of the expansion plate 4; the tension of the first tension spring 31 is equal to the tension of the second tension spring 51.

[0033] Before forming the mesh material using the head mechanism, first, according to the inner diameter requirement of the mesh material after forming, push the corresponding supplementary plate 6 upward. During the upward movement of the supplementary plate 6, it will drive the lower support bar 5 to slide upward along the vertical groove 22. When the upper end of the supplementary plate 6 approaches the lower end of the expansion plate 4, separate two adjacent expansion plates 4 among them. During the process of separating the two adjacent expansion plates 4, multiple expansion plates 4 squeeze each other and expand outward. In this way, the upper support piece 3 will slide with the corresponding upper support groove 41, and multiple first tension springs 31 are pulled by the corresponding upper support pieces 3. After a gap is formed between the adjacent expansion plates 4, push the supplementary plate 6 upward and into the gap. The supplementary plate 6 will enter the gap between the adjacent expansion plates 4. After releasing the supplementary plate 6, the expansion plate 4 in contact with the supplementary plate 6 gives a reaction force to the supplementary plate 6 under the pull of the first tension spring 31. The cross-sections of multiple supplementary plates 6 and multiple expansion plates 4 are all fan-shaped. All the expansion plates 4 and the supplementary plates 6 in contact with the expansion plates 4 squeeze each other. The tension of the first tension spring 31 is equal to the tension of the second tension spring 51. In this way, during the mutual extrusion process of the expansion plate 4 and the corresponding supplementary plate 6, they will balance and expand outward. After the mutual extrusion of multiple expansion plates 4 and the corresponding supplementary plates 6 is balanced, the arc-shaped outer walls of the expansion plate 4 and the supplementary plate 6 can be approximately transitional. The outer wall of the expansion head does not need to be a perfect circle. In this way, it can meet the requirement of expanding the corresponding diameter of the mesh material. After releasing the supplementary plate 6, the supplementary plate 6 is clamped by the circumferentially arranged expansion plates 4, making it not easy for the supplementary plate 6 to fall off, so that the supplementary plate 6 and the expansion plate 4 are used more stably;

[0034] Then, two different plastic raw materials or raw materials of different colors are simultaneously conveyed to the extrusion head 1 and mixed inside the extrusion head 1. The extrusion head 1 relies on the rotation of the inner and outer die orifices of the rotating head, and the molten material continuously extrudes into filaments from the small holes of the inner and outer die orifices of the rotating head. When the rotation of the inner and outer die orifices separates the small holes on their die orifices, it becomes a mesh strip. When the small holes coincide, it becomes a mesh. By the rotation of the head, the small holes are continuously separated and coincided, and a continuous extruded mesh is obtained. The above principle is the prior art and will not be elaborated here too much, and the above component schematic diagrams are not shown;

[0035] After the extrusion head 1 extrudes the mesh material along the extrusion port 11, it enters the outside of the central rod 2. Since the outer wall of the central rod 2 forms a new expanded outer wall through all the expansion plates 4 and the inserted supplementary plates 6, when the mesh material is extruded from the extrusion port and enters the expanded outer wall, the specification of the expanded outer wall is larger than the inner diameter of the mesh material. Thus, the mesh material can be expanded, realizing the expansion of the inner diameter of the mesh material to meet the extrusion requirement. The mesh material passing through the central rod 2 and the expanded outer wall will enter the coolant for cooling and forming, and finally be pulled out from the bottom of the coolant and enter the next process;

[0036] In the present invention, a corresponding number of supplementary plates 6 are inserted into the gaps between multiple expansion plates 4, so that all the expansion plates 4 and the inserted supplementary plates 6 form a new expanded outer wall, thereby meeting the expansion requirements of different diameters, and enabling the net materials extruded from the extrusion head 1 to form net materials with different diameters after expansion.

[0037] Embodiment 2: An upper guiding surface 42 is provided at the circumferential position of the lower end of the expansion plate 4; a lower guiding block 62 is fixedly connected to the upper end of the supplementary plate 6; a lower guiding surface 63 is provided at the circumferential position of the upper end of the lower guiding block 62; the upper end of the lower guiding block 62 can enter the gap between the lower ends of adjacent expansion plates 4.

[0038] In this embodiment, an upper guiding block 43 is fixedly connected to the upper end of the expansion plate 4; the arc-shaped outer walls of the upper guiding block 43 and the lower guiding block 62 are arranged close to the central rod 2 from bottom to top; the upper support piece 3 is slidably and sealingly connected to the upper support groove 41; the bottom of the upper support groove 41 is communicated with the upper end of the upper guiding block 43 through an upper hole 44; the upper holes 44 at the upper ends of two adjacent upper guiding blocks 43 are connected by an elastic tube 45; the elastic force of the elastic tube 45 is greater than the pulling force of the first tension spring 31.

[0039] During the upward movement of the supplementary plate 6, the lower guide block 62 will be driven upward. The upper end of the lower guide block 62 is narrower under the setting of the lower guide surface 63. A gap is formed at the lower end of the adjacent expansion plates 4 under the setting of the upper guide surface 42. Therefore, during the upward movement of the supplementary plate 6, the lower guide block 62 can be smoothly driven into the gap at the lower end of the adjacent expansion plates 4. As the supplementary plate 6 continues to move upward, the lower guide surface 63 on the circumference of the lower guide block 62 will squeeze the upper guide surface 42 on the circumference of the lower end of the expansion plate 4, so that the expansion plates 4 on both sides of the lower guide block 62 are separated from each other. The supplementary plate 6 will enter between the adjacent expansion plates 4 as the lower guide block 62 moves upward. All the expansion plates 4 will move relative to the corresponding upper support pieces 3 under the extrusion of the inserted supplementary plate 6. The upper support pieces 3 will slide with the corresponding upper support grooves 41. During the process of the upper support piece 3 moving away from the bottom of the upper support groove 41, the first tension spring 31 will be pulled and a negative pressure will be formed in the upper support groove 41. Since all the upper support grooves 41 are connected by the elastic tube 45, the gas pressures in all the upper support grooves 41 are kept the same. The self-elastic force of the elastic tube 45 is greater than the air pressure in the upper support groove 41 to prevent the elastic tube 45 from collapsing and affecting the gas flow between the adjacent upper support grooves 41. After the air pressures in all the upper support grooves 41 are the same, the distances of the upper support pieces 3 from the bottom of the upper support grooves 41 are the same. In this way, the degrees of outward expansion of all the expansion plates 4 are the same, and then the new expanded outer wall is more regular, which is convenient for the expansion and forming of the mesh material. Under the guidance of the upper guide block 43 and the lower guide block 62, the mesh material can enter the new expanded outer wall more smoothly. In addition, when multiple supplementary plates 6 need to be inserted into the expansion plates 4, the inserted positions are scattered, which can also make the new expanded outer wall more regular.

[0040] Embodiment 3: A locking groove 23 is provided on the surface of the vertical groove 22 close to the center of the central rod 2; the distance from the locking groove 23 to the upper end of the vertical groove 22 is equal to the vertical height of the lower support bar 5; a threaded cavity 24 is provided on the lower surface of the central rod 2; a plug 25 is threadedly and sealingly connected in the threaded cavity 24; a liquid medium is filled in the threaded cavity 24; a locking block 7 is slidably and sealingly connected in the locking groove 23; the upper end of the threaded cavity 24 communicates with the bottom of the locking groove 23 through a lower hole 26.

[0041] In this embodiment, an annular anti-rotation groove 27 is provided at the bottom of the annular groove 21; an elastic bladder 8 with the same specification and shape is provided in the anti-rotation groove 27; the bottom of the anti-rotation groove 27 communicates with the upper end of the threaded cavity 24 through a first liquid hole 81.

[0042] Before pushing the supplementary plate 6 into the gap between the adjacent expansion plates 4, first reverse-rotate the plug 25, causing the plug 25 to move downward. The space in the threaded cavity 24 becomes larger to form a negative pressure. The liquid medium in the elastic bladder 8 enters the threaded cavity 24 along the first liquid hole 81. The elastic bladder 8 will deflate and enter the anti-rotation groove 27. As the plug 25 continues to move downward, a negative pressure will be formed in the locking groove 23. The liquid medium in the locking groove 23 enters the threaded cavity 24 along the lower hole 26. The locking block 7 in the locking groove 23 retracts into the locking groove 23 under the action of the negative pressure. Subsequently, control the supplementary plate 6 to move upward. During the upward movement of the supplementary plate 6, it will drive the lower support bar 5 to slide along the vertical groove 22. The lower support bar 5 will cross the locking groove 23. When the supplementary plate 6 is inserted into the gap between the adjacent expansion plates 4, all the expansion plates 4 will expand outward. The expansion plates 4 will generate circumferential movement, that is, the upper support piece 3 will generate circumferential movement along the annular groove 21;

[0043] After the upward movement of the supplementary plate 6 stops, rotate the plug 25 forward. During the upward movement of the plug 25, it will squeeze the liquid medium in the threaded cavity 24. Part of the liquid medium will enter the locking groove 23 along the lower hole 26, thereby squeezing the locking block 7 in the locking groove 23, causing the locking block 7 to partially extend out of the locking groove 23 and move below the lower support bar 5 that crosses the locking groove 23, realizing the limitation of the lower support bar 5. In this way, it is avoided that the downward movement of the lower support bar 5 and the supplementary plate 6 affects the diameter and integrity of the expanded outer wall, making the expanded outer wall more stable during the expansion of the mesh material;

[0044] The locking block 7 extends into the vertical groove 22 under the action of the liquid pressure but does not extend out of the vertical groove 22. As the bolt continues to move upward, the plug 25 will continue to squeeze the liquid medium in the threaded cavity 24. The liquid medium will enter the anti-rotation groove 27 along the first liquid hole 81 and squeeze the elastic bladder 8, causing the elastic bladder 8 to expand. One end of the upper support piece 3 close to the central rod 2 abuts against the bottom of the annular groove 21. There is a gap between adjacent upper support pieces 3 in the circumferential direction. In this way, after the elastic bladder 8 expands, it will enter the gap between adjacent upper support pieces 3, thereby inhibiting the circumferential movement of the upper support piece 3 in the annular groove 21 and achieving the purpose of locking the upper support piece 3. With the upper support piece 3 locked, the expansion plate 4 cannot perform circumferential movement, making the expanded outer wall not easy to shake and deform during the expansion of the mesh material and more stable.

[0045] Embodiment 4: One outer wall of the expansion plate 4 at a lower position in the circumferential direction is provided with an upper linkage block 46; another outer wall of the expansion plate 4 in the circumferential direction has an upper linkage groove 47 with an opening facing downward; one outer wall of the supplementary plate 6 at an upper position in the circumferential direction is provided with a lower linkage block 64; another outer wall of the supplementary plate 6 in the circumferential direction has a lower linkage groove 65 with an opening facing upward.

[0046] In this embodiment, the opening of the upper linkage groove 47 is arranged to decrease from bottom to top; the opening of the lower linkage groove 65 is arranged to decrease from top to bottom; an upper telescopic hole 48 is arranged at a position corresponding to the outer wall of the expansion plate 4 and the upper linkage block 46; the upper linkage block 46 is slidably connected in the upper telescopic hole 48; the upper linkage block 46 is connected to the bottom of the upper telescopic hole 48 through a first spring 49; a lower telescopic hole 66 is arranged at a position corresponding to the outer wall of the supplementary plate 6 and the lower linkage block 64; the lower linkage block 64 is slidably connected in the lower telescopic hole 66; the lower linkage block 64 is connected to the bottom of the lower telescopic hole 66 through a second spring 67.

[0047] During the upward movement of the supplementary plate 6, it will enter the gap between the adjacent expansion plates 4, the upper linkage block 46 on the expansion plate 4 will enter the lower linkage groove 65 on the supplementary plate 6, and the lower linkage block 64 on the supplementary plate 6 will enter the upper linkage groove 47 on the expansion plate 4. The opening of the upper linkage groove 47 decreases from bottom to top, and the opening of the lower linkage groove 65 decreases from top to bottom. In this way, the upper linkage block 46 will enter along the lower linkage groove 65 to the lower limit position of the lower linkage groove 65, and the lower linkage block 64 will enter along the upper linkage groove 47 to the upper limit position of the upper linkage groove 47, so that the supplementary plate 6 and the expansion plate are connected. 4, when the supplementary plate 6 enters the gap between the adjacent expansion plates 4, the supplementary plate 6 and the expansion plate 4 are simultaneously expanded outward due to the restrictions of the upper linkage block 46 and the lower linkage block 64. Even if a gap is formed between the expansion plate 4 and the supplementary plate 6, since the upper linkage block 46 is slidably connected in the upper telescopic hole 48 and under the elastic force of the first spring 49, the upper linkage block 46 will not be separated from the lower linkage groove 65, and the lower linkage block 64 will not be separated from the upper linkage groove 47. In this way, it is ensured that the expansion plate 4 and the inserted supplementary plate 6 can be expanded outward synchronously, and the regularity of the formed expansion outer wall is further ensured.

[0048] Embodiment 5: A flexible rope 71 is provided in the lock slot 23; one end of the flexible rope 71 is connected to the bottom of the lock slot 23, and the other end is connected to one end of the lock block 7 close to the bottom of the lock slot 23; the lock block 7 cannot pass through the vertical slot 22 and move out to the outside under the limitation of the flexible rope 71.

[0049] In this embodiment, an upward moving groove 28 is provided at the lower end of the vertical groove 22 ; the upward moving groove 28 is slidably and sealably connected to the upward moving bar 9 ; the bottom of the upward moving groove 28 is connected to the threaded cavity 24 through the second liquid hole 91 .

[0050] During the process of screwing the plug 25 downward, the upward movement strip 9 retracts into the upward movement groove 28 along the upward movement groove 28 under the action of negative pressure. The lower support strip 5 moves downward along the vertical groove 22 under the gravity of the supplementary plate 6. The lower guide block 62 moves downward as the supplementary plate 6 moves downward. The lower guide block 62 moves out of the gap at the lower end of the adjacent expansion plate 4. The elastic bladder 8 also deflates. The locking block 7 retracts into the locking groove 23. After pushing the corresponding supplementary plate 6 upward and inserting it into the gap between the adjacent expansion plates 4, the plug 25 is screwed upward. The elastic bladder 8 is compressed and expands. The locking block 7 is compressed and slides outward along the locking groove 23 and pulls the flexible rope 71. Under the limitation of the flexible rope 71, the locking block 7 can only extend into the vertical groove 22 but cannot pass through and extend out of the vertical groove 22. The liquid medium enters the upward movement groove 28 along the second liquid hole 91, so that the medium pushes the upward movement strip 9 upward. The upward movement strip 9 pushes the lower support strip 5 at the lower position in the vertical groove 22 upward. The movable lower support strip 5 drives the supplementary plate 6 and the lower guide block 62 that are not inserted into the expansion plate 4 upward. The lower guide block 62 is stuck in the gap at the lower end of the adjacent expansion plate 4. On the one hand, it makes the lower guide block 62 closer to the lower end of the expansion plate 4, facilitating the transition of the mesh material from the expanded outer wall to the outer wall of the unused supplementary plate 6. On the other hand, it further restricts the circumferential movement of the expansion plate 4.

[0051] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the Figure 1 orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-machine co-extrusion plastic mesh material forming rotating head mechanism, comprising an extrusion head (1) and a circular extrusion port (11) on the lower surface of the extrusion head (1); the center of the lower surface of the extrusion head (1) is fixedly connected to a center rod (2); the extrusion port (11) on the lower surface of the extrusion head (1) extrude the mesh material and then enters the outer side of the center rod (2); characterized in that: The outer wall of the center rod (2) is provided with an annular groove (21) at an upper position; the annular groove (21) is movably connected to an upper support plate (3) along a circumferential direction; the outer wall of the center rod (2) is provided with an expansion plate (4) around the annular groove (21); a plurality of the expansion plates (4) are arranged adjacent to each other and in contact with each other, and the arc-shaped outer wall is arranged in transition; the expansion plate (4) is provided with an upper support groove (41) on a side facing the center rod (2); the upper support plate (3) is slidably connected in the corresponding upper support groove (41); the upper support plate (3) is connected to the bottom of the upper support groove (41) via a first tension spring (31); the outer wall of the center rod (2) is provided with a vertical groove (22); a plurality of the vertical grooves (22) are arranged around the center rod (2) distribution; the lower support bar (5) is connected to the vertical groove (22) in an upward and downward sliding manner; a supplementary plate (6) is distributed at a lower position of the outer wall of the center rod (2); the arc-shaped outer wall of the supplementary plate (6) is adapted to the arc-shaped outer wall of the expansion plate (4); a lower support groove (61) is provided on one side of the supplementary plate (6) close to the center rod (2); the lower support bar (5) is slidably connected in the lower support groove (61); the lower support bar (5) is connected to the bottom of the lower support groove (61) through a second tension spring (51); the lower support bar (5) is connected to the lower end of the supplementary plate (6); the vertical length of the supplementary plate (6) is greater than the vertical length of the expansion plate (4); the tension of the first tension spring (31) is equal to the tension of the second tension spring (51); An upper guide surface (42) is provided at a circumferential position of the expansion plate (4) near the lower end; the supplementary plate (6) is fixedly connected to a lower guide block (62) at an upper end; a lower guide surface (63) is provided at a circumferential position of the lower end of the lower guide block (62); the upper end of the lower guide block (62) can enter into a gap between the lower ends of the adjacent expansion plates (4); A locking groove (23) is provided on one side of the vertical groove (22) close to the center of the center rod (2); the distance between the locking groove (23) and the upper end of the vertical groove (22) is equal to the vertical height of the lower support bar (5); a threaded cavity (24) is provided on the lower surface of the center rod (2); the threaded cavity (24) is thread-sealed and connected to a screw plug (25); the threaded cavity (24) is filled with a liquid medium; the locking groove (23) is slidably sealed and connected to a locking block (7); the upper end of the threaded cavity (24) is connected to the bottom of the locking groove (23) through a lower hole (26); The bottom of the annular groove (21) is provided with an annular anti-rotation groove (27); an elastic bag (8) of the same specification and shape is provided in the anti-rotation groove (27); the bottom of the anti-rotation groove (27) is connected to the upper end of the threaded cavity (24) through the first liquid hole (81).

2. A dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 1, characterized in that: The upper end of the expansion plate (4) is fixedly connected to the upper guide block (43); the arc-shaped outer walls of the upper guide block (43) and the lower guide block (62) are arranged from bottom to top close to the center rod (2); the upper support plate (3) is slidably and sealedly connected to the upper support groove (41); the bottom of the upper support groove (41) is connected to the upper end of the upper guide block (43) through an upper hole (44); the upper holes (44) of two adjacent upper guide blocks (43) are connected through an elastic tube (45); the elastic force of the elastic tube (45) is greater than the tension of the first tension spring (31).

3. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 1, characterized in that: An upper linkage block (46) is provided at a lower position on one of the outer walls on the circumference of the expansion plate (4); an upper linkage groove (47) is provided on another outer wall on the circumference of the expansion plate (4) with an opening facing downward; a lower linkage block (64) is provided at an upper position on one of the outer walls on the circumference of the supplementary plate (6); and a lower linkage groove (65) is provided on another outer wall on the circumference of the supplementary plate (6) with an opening facing upward.

4. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 3, characterized in that: The opening of the upper linkage groove (47) is arranged to decrease from bottom to top; the opening of the lower linkage groove (65) is arranged to decrease from top to bottom; an upper telescopic hole (48) is arranged on the outer wall of the expansion plate (4) at a position corresponding to the upper linkage block (46); the upper linkage block (46) is slidably connected in the upper telescopic hole (48); the upper linkage block (46) is connected to the bottom of the upper telescopic hole (48) through a first spring (49); a lower telescopic hole (66) is arranged on the outer wall of the supplementary plate (6) at a position corresponding to the lower linkage block (64); the lower linkage block (64) is slidably connected in the lower telescopic hole (66); the lower linkage block (64) is connected to the bottom of the lower telescopic hole (66) through a second spring (67).

5. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 1, characterized in that: A flexible rope (71) is provided in the locking groove (23); one end of the flexible rope (71) is connected to the bottom of the locking groove (23), and the other end is connected to an end of the locking block (7) close to the bottom of the locking groove (23); the locking block (7) cannot pass through the vertical groove (22) and move out to the outside when limited by the flexible rope (71).

6. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 1, characterized in that: The vertical groove (22) is provided with an upwardly moving groove (28) at the lower end thereof; the upward moving groove (28) is slidably sealed and connected to the upward moving bar (9); the bottom of the upward moving groove (28) is connected to the threaded cavity (24) via a second liquid hole (91).

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