Double-machine co-extrusion plastic net material forming rotating machine head mechanism

Abstract

The invention relates to the technical field of plastic forming, in particular to a double-machine co-extrusion plastic net material forming rotating machine head mechanism. Comprising an extrusion head and an annular extrusion opening in the lower surface of the extrusion head. The center of the lower surface of the extrusion head is fixedly connected with a center rod; an extrusion opening in the lower surface of the extrusion head extrudes a net material and then enters the outer side of the central rod; an annular groove is formed in the upper position of the outer wall of the center rod; an upper supporting piece is movably connected into the annular groove in the circumferential direction. An expansion plate is arranged on the outer wall of the center rod around the annular groove; the multiple expansion plates are arranged in an adjacent contact mode, and the arc-shaped outer walls are arranged in a transition mode. The corresponding number of supplementing plates are inserted into the gaps of the multiple expansion plates, so that all the expansion plates and the inserted supplementing plates form a new expansion outer wall, the expansion requirements of different diameters are met, and net materials with different diameters are formed after the net materials are extruded from an extrusion head and expanded.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding, in particular to a double-machine co-extrusion plastic mesh material molding rotary die head mechanism. Background Art

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

[0003] Double-material or double-machine co-extrusion technology came into being and became an important means to improve the performance of plastic mesh materials. Double-material co-extrusion technology can produce mesh materials with composite properties and multiple colors by simultaneously delivering two different plastic raw materials or raw materials of different colors to the extruder head and mixing and extruding them inside the head.

[0004] The die mechanism includes an extrusion head at the upper position and an expansion head at the lower position; the extrusion head in the die mechanism relies on the rotation of the inner and outer dies of the rotating die, and the molten material is continuously extruded from the small holes of the inner and outer dies of the rotating die into wires; when the inner and outer dies rotate to separate the small holes on the dies, they become mesh strips, and when the small holes overlap, they become a mesh. The rotation of the die causes the small holes to continuously separate and overlap, thus obtaining a continuously extruded mesh. The extrusion head in the mechanism will extrude the mesh material and then move it down on the outside of the expansion head. The outer diameter of the expansion head is larger than the inner diameter of the mesh material extruded from the extrusion head, so that the mesh material is expanded after passing through the expansion head, but the existing outer diameter of the expansion head is constant, so that the diameter of the mesh material after the die mechanism is formed is single. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, the present invention proposes a dual-machine co-extrusion plastic mesh forming rotating head mechanism, which inserts a corresponding number of supplementary plates into the gaps between multiple expansion plates, so that all the expansion plates and the inserted supplementary plates form a new expanded outer wall, thereby meeting the expansion requirements of different diameters, so that meshes of different diameters are 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: the double-machine co-extrusion plastic mesh material forming rotating head mechanism described in the present invention comprises an extrusion head and a circular extrusion port on the lower surface of the extrusion head; the center of the lower surface of the extrusion head is fixedly connected to a center rod; the extrusion port on the lower surface of the extrusion head extrude the mesh material into the outside of the center rod; an annular groove is arranged at the upper position of the outer wall of the center rod; the upper support plate is movably connected to the inner wall of the annular groove along the circumferential direction; an expansion plate is arranged on the outer wall of the center rod around the annular groove; a plurality of the expansion plates 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 is provided with an upper supporting groove on the side facing the center rod; the upper supporting sheet is slidably connected in the corresponding upper supporting groove; the upper supporting sheet is connected to the bottom of the upper supporting groove by a first tension spring; a vertical groove is provided on the lower outer wall of the center rod; a plurality of the vertical grooves are distributed around the center rod; a lower supporting bar is slidably connected up and down in the vertical groove; a supplementary plate is distributed on the lower outer wall of the center rod; the arc-shaped outer wall of the supplementary plate is adapted to the arc-shaped outer wall of the expansion plate; a lower supporting groove is provided on the side of the supplementary plate close to the center rod; the lower supporting bar is slidably connected in the lower supporting groove; the lower supporting bar is connected to the bottom of the lower supporting groove by a second tension spring; the lower supporting bar 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 guide surface is provided at a circumferential position near the lower end of the expansion plate; the upper end of the supplementary plate is fixedly connected to the lower guide block; a lower guide surface is provided at a circumferential position near the upper end of the lower guide block; the upper end of the lower guide block can enter the gap between the adjacent expansion plates near the lower end.

[0008] Preferably, the expansion plate is fixedly connected to the upper guide block at the upper end; the arc-shaped outer walls of the upper guide block and the lower guide block are arranged from bottom to top close to the center rod; the upper support plate is slidingly and sealingly connected to the upper support groove; the bottom of the upper support groove is connected to the upper end of the upper guide block through the upper hole; the upper holes of the upper ends of two adjacent upper guide blocks are connected by 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 one side of the vertical groove close to the center of the center 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 bar; a threaded cavity is provided on the lower surface of the center rod; the threaded cavity is sealed with a screw plug; the threaded cavity is filled with a liquid medium; the locking block is slidingly sealed in the locking groove; the upper end of the threaded cavity is connected to the bottom of the locking groove through a lower hole.

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

[0011] Preferably, an upper linkage block is provided at a lower position on one of the outer walls on the circumference of the expansion plate; an upper linkage groove is provided at a downward opening on another outer wall on the circumference of the expansion plate; a lower linkage block is provided at an upper position on one of the outer walls on the circumference of the supplementary plate; and a lower linkage groove is provided at an upward opening on another outer wall on the circumference of the supplementary plate.

[0012] Preferably, the opening of the upper linkage slot is arranged to decrease from bottom to top; the opening of the lower linkage slot is arranged to decrease from top to bottom; the outer wall of the expansion plate and the corresponding position of the upper linkage block are provided with an upper telescopic hole; the upper linkage block is slidably connected in the upper telescopic hole; the upper linkage block is connected to the bottom of the upper telescopic hole through a first spring; the outer wall of the supplementary plate and the corresponding position of the lower linkage block are provided with a lower telescopic hole; the lower linkage block is slidably connected in the lower telescopic hole; the lower linkage block is connected to the bottom of the lower telescopic hole through a second spring.

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

[0014] Preferably, an upward moving groove is arranged at the lower end of the vertical groove; the upward moving groove is slidingly sealed and connected to the upward moving bar; the bottom of the upward moving groove is connected to the threaded cavity through the second liquid hole.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention inserts a corresponding number of supplementary plates into the gaps between multiple expansion plates, so that all the expansion plates and the inserted supplementary plates form a new expansion outer wall, thereby meeting the expansion requirements of different diameters, so that mesh materials of different diameters are formed after being extruded from the extrusion head and expanded.

[0016] 2. In the present invention, since all the upper support grooves are connected by elastic tubes, the gas pressure in all the upper support grooves remains consistent. After the gas pressure in all the upper support grooves is the same, the upper support sheets are at the same distance from the bottom of the upper support grooves, so that all the expansion plates expand outward to the same extent, thereby making the new expanded outer wall more regular, which is convenient for the expansion and molding of the mesh material.

[0017] 3. During the upward movement of the screw plug of the present invention, the liquid medium in the threaded cavity will be squeezed, and part of the liquid medium will enter the lock groove along the lower hole, thereby squeezing the lock block in the lock groove, so that the lock block partially extends out of the lock groove and moves to below the lower support bar that passes the lock groove, thereby limiting the lower support bar. In this way, the downward movement of the lower support bar and the supplementary plate will not affect the diameter and integrity of the expanded outer wall, making the expanded outer wall more stable during the expansion of the mesh material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0019] Figure 1 is a stereogram of the present invention; Figure 2 It is a position diagram of the extrusion outlet of the present invention; Figure 3 is a cross-sectional view of the present invention; Figure 4 yes Figure 3 The enlarged view of point A in the middle; Figure 5 yes Figure 3 The enlarged view of point B in the middle; Figure 6 yes Figure 3 Enlarged view of point C in the middle; Figure 7 is a three-dimensional diagram of an expansion plate and a supplementary plate in the present invention; Figure 8 It is a position diagram of the annular groove and the vertical groove in the present invention; Fig. 9 It is a schematic diagram of the cooperation between the expansion plate and the elastic bag in the present invention; Fig.10 It is a cross-sectional view of the supplementary plate in the present invention.

[0020] In the figure: extrusion head 1, extrusion port 11, center rod 2, annular groove 21, vertical groove 22, locking groove 23, threaded cavity 24, screw plug 25, lower hole 26, anti-rotation groove 27, upper shift groove 28, upper support sheet 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, upper shift strip 9, second liquid hole 91. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] like Figures 1 to 10 As shown, the present invention includes the following embodiments: Embodiment 1: A dual-machine co-extrusion plastic mesh material forming rotating head mechanism, comprising an extrusion head 1 and a ring-shaped 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 enters the outside of the center rod 2; an annular groove 21 is provided on the upper position of the outer wall of the center rod 2; an upper support sheet 3 is movably connected to the annular groove 21 along the circumferential direction; an expansion plate 4 is provided on the outer wall of the center rod 2 around the annular groove 21; a plurality of expansion plates 4 are arranged adjacent to each other and in contact, and an arc-shaped outer wall transition is arranged; an upper support groove 41 is provided on the side of the expansion plate 4 facing the center rod 2; the upper support sheet 3 is slidably connected to the corresponding upper support groove 41; the upper support sheet 3 is connected to the corresponding upper support groove 41 through the first A tension spring 31 is connected to the bottom of the upper support groove 41; a vertical groove 22 is provided at the lower position of the outer wall of the center rod 2; a plurality of the vertical grooves 22 are distributed around the center rod 2; a lower support bar 5 is connected to the vertical groove 22 in an up and down sliding manner; a supplementary plate 6 is distributed at the 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.

[0023] Before using the head mechanism to form the mesh material, first push the corresponding supplementary plate 6 upward according to the inner diameter requirement of the mesh material after forming. During the upward movement of the supplementary plate 6, the lower support bar 5 will be driven to slide upward along the vertical groove 22. When the upper end of the supplementary plate 6 is close to the lower end of the expansion plate 4, two adjacent expansion plates 4 are pushed apart. In the process of two adjacent expansion plates 4 being pushed apart, multiple expansion plates 4 are squeezed against each other and expanded outward, so that the upper support sheet 3 will slide with the corresponding upper support groove 41, so that multiple first tension springs 31 are pulled by the corresponding upper support sheet 3. After a gap is formed between the adjacent expansion plates 4, the supplementary plate 6 is moved upward and pushed 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 plates 4 in contact with the supplementary plate 6 are in The first tension spring 31 pulls the supplementary plate 6 to give it a reaction force. The cross-sections of the multiple supplementary plates 6 and the 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 are squeezed against each other. The tension of the first tension spring 31 is equal to the tension of the second tension spring 51. In this way, the expansion plates 4 and the corresponding supplementary plates 6 will be balanced and expand outward during the mutual squeezing process. After the multiple expansion plates 4 and the corresponding supplementary plates 6 are squeezed against each other and balanced, the arc-shaped outer walls of the expansion plates 4 and the supplementary plates 6 can be approximately transitioned, and the outer wall of the expansion head does not need to be a perfect circle. In this way, the requirements for the corresponding diameter of the expansion of the mesh material can be met. After the supplementary plates 6 are loosened, the supplementary plates 6 are clamped by the expansion plates 4 in the circumferential direction, so that the supplementary plates 6 are not easy to fall off, and the supplementary plates 6 and the expansion plates 4 are more stable to use. Then, two different plastic raw materials or raw materials of different colors are simultaneously conveyed to the extruder head 1 and mixed inside the extruder head 1. The extruder head 1 rotates the inner and outer die openings of the rotating head, and the molten material is continuously extruded from the small holes of the inner and outer die openings of the rotating head into wires. When the inner and outer die openings rotate to separate the small holes on the die openings, they become mesh strips. When the small holes overlap, they become a mesh. The rotation of the head continuously separates and overlaps the small holes, and a continuous extrusion net is obtained. The above principle is the prior art and will not be described in detail here. The above component principle diagram is not shown. The extruder head 1 extrude the mesh material along the extrusion port 11 and then enters the outside of the center rod 2. Since the outer wall of the center rod 2 passes through all the expansion plates 4 and the inserted supplementary plates 6 to form a new expansion outer wall, the mesh material is extruded from the outlet and enters the process of the expansion outer wall. The specification of the expansion outer wall is larger than the inner diameter of the mesh material, so that the mesh material can be expanded to achieve the expansion of the inner diameter of the mesh material to meet the extrusion requirements. The mesh material passing through the center rod 2 and the expansion outer wall will enter the coolant to cool and form, and finally be pulled out from the bottom of the coolant to enter the next step; The present invention inserts a corresponding number of supplementary plates 6 into the gaps between multiple expansion plates 4, so that all expansion plates 4 and the inserted supplementary plates 6 form a new expanded outer wall, thereby meeting the expansion requirements of different diameters, so that mesh materials of different diameters are formed after being extruded from the extrusion head 1 and expanded.

[0024] Embodiment 2: An upper guide surface 42 is provided at a circumferential position near the lower end of the expansion plate 4; the upper end of the supplementary plate 6 is fixedly connected to a lower guide block 62; a lower guide surface 63 is provided at a circumferential position near the upper end of the lower guide block 62; the upper end of the lower guide block 62 can enter into a gap between the adjacent expansion plates 4 near the lower end.

[0025] In this embodiment, 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 slidingly and sealingly 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 the upper hole 44; the upper holes 44 of the upper ends of two adjacent upper guide blocks 43 are connected by an elastic tube 45; the elastic force of the elastic tube 45 is greater than the tension of the first tension spring 31.

[0026] The lower guide block 62 will be driven upward during the upward movement of the supplementary plate 6. The upper end of the lower guide block 62 is narrower due to the setting of the lower guide surface 63. The lower end of the adjacent expansion plate 4 forms a gap due to the setting of the upper guide surface 42. Therefore, the lower guide block 62 can be driven smoothly into the gap at the lower end of the adjacent expansion plate 4 during the upward movement of the supplementary plate 6. 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, and 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 with the corresponding upper support sheets 3 under the squeezing of the inserted supplementary plate 6, and the upper support sheets 3 will slide with the corresponding upper support grooves 41. When the upper support sheets 3 are away from the bottom of the upper support grooves 41, During the process, 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 through the elastic tube 45, the gas pressure in all the upper support grooves 41 remains consistent. The elastic force of the elastic tube 45 itself is greater than the air pressure in the upper support groove 41, so as to avoid the elastic tube 45 from drying up and affecting the gas circulation in the adjacent upper support grooves 41. After the air pressure in all the upper support grooves 41 is the same, the upper support sheet 3 is at the same distance away from the bottom of the upper support groove 41, so that all the expansion plates 4 expand outward to the same extent, thereby making the new expansion outer wall more regular and facilitating the expansion and molding of the mesh material; under the guidance of the upper guide block 43 and the lower guide block 62, the mesh material enters the new expansion outer wall more smoothly; in addition, when multiple supplementary plates 6 are required to be inserted into the expansion plate 4, the insertion positions are dispersed, which can also make the new expansion outer wall more regular.

[0027] Embodiment 3: 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 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 center rod 2; the threaded cavity 24 is threadedly sealed and connected to a screw plug 25; the threaded cavity 24 is filled with a liquid medium; the locking groove 23 is slidingly 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.

[0028] In this embodiment, an annular anti-rotation groove 27 is provided at the bottom of the annular groove 21; 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.

[0029] Before pushing the supplementary plate 6 into the gap between the adjacent expansion plates 4, the screw plug 25 is first screwed in the opposite direction so that the screw plug 25 moves downward, the space in the threaded cavity 24 becomes larger and forms a negative pressure, and the liquid medium in the elastic bag 8 enters the threaded cavity 24 along the first liquid hole 81. The elastic bag 8 shrinks and enters the anti-rotation groove 27. As the screw plug 25 continues to move downward, a negative pressure is formed in the lock groove 23, and the liquid medium in the lock groove 23 enters the threaded cavity 24 along the lower hole 26. The locking block 7 in the lock groove 23 retracts into the lock groove 23 under the action of the negative pressure, and then the supplementary plate 6 is controlled to move upward. During the upward movement of the supplementary plate 6, the lower support bar 5 will be driven to slide along the vertical groove 22, and the lower support bar 5 will pass over the lock 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, and the expansion plates 4 will produce circumferential movement, that is, the upper support sheet 3 will produce circumferential movement along the annular groove 21. After the supplementary plate 6 stops moving upward, the screw plug 25 is turned forward. During the upward movement of the screw plug 25, the liquid medium in the threaded cavity 24 is squeezed, and part of the liquid medium enters the lock groove 23 along the lower hole 26, thereby squeezing the lock block 7 in the lock groove 23, so that the lock block 7 partially extends out of the lock groove 23 and moves to the bottom of the lower support bar 5 that crosses the lock groove 23, so as to limit the lower support bar 5, thereby preventing the lower support bar 5 and the supplementary plate 6 from moving downward to affect the diameter and integrity of the expanded outer wall, so that the expanded outer wall is more stable during the expansion process of the mesh material; Under the action of liquid pressure, the locking block 7 extends into the vertical groove 22 but does not extend out of the vertical groove 22. As the bolt continues to move upward, the screw plug 25 will continue to squeeze the liquid medium in the threaded cavity 24, and the liquid medium will enter the anti-rotation groove 27 along the first liquid hole 81 to squeeze the elastic bag 8, causing the elastic bag 8 to expand. The end of the upper support piece 3 close to the center rod 2 is against the bottom of the annular groove 21, and there is a gap between the adjacent upper support pieces 3 in the circumferential direction. In this way, after the elastic bag 8 expands, it will enter into the gap between the adjacent upper support pieces 3, thereby suppressing the circumferential movement of the upper support piece 3 in the annular groove 21, thereby achieving the purpose of locking the upper support piece 3. When the upper support piece 3 is locked, the expansion plate 4 cannot move circumferentially, so that the expansion outer wall is not easy to shake and deform during the expansion process of the mesh material, and is more stable.

[0030] Embodiment 4: 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 at a downward opening on another outer wall on the circumference of the expansion plate 4; 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 at an upward opening on another outer wall on the circumference of the supplementary plate 6.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 .

[0035] When the screw plug 25 is turned and moved downward, the upward moving strip 9 is retracted into the upward moving groove 28 under the action of negative pressure, and the lower support strip 5 is moved downward along the vertical groove 22 under the action of the gravity of the supplementary plate 6. The lower guide block 62 is moved downward with the downward movement of the supplementary plate 6, and the lower guide block 62 is moved out from the gap at the lower end of the adjacent expansion plate 4. The elastic bag 8 is also deflated, and the locking block 7 is retracted into the locking groove 23. After pushing the corresponding supplementary plate 6 upward and inserting it into the gap of the adjacent expansion plate 4, the screw plug 25 is turned and moved upward, the elastic bag 8 is compressed and expanded, and 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 will enter the upward groove 28 along the second liquid hole 91, so that the medium pushes the upward moving bar 9 to move upward, and the upward moving bar 9 pushes the lower support bar 5 at the lower position in the vertical groove 22 to move upward, and the lower support bar 5 that can move upward will drive the supplementary plate 6 that is not inserted into the expansion plate 4 and the lower guide block 62 to move upward, and the lower guide block 62 will be 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, which is convenient for the mesh material to transition from the expansion outer wall to the outer wall of the inactivated supplementary plate 6, and on the other hand, it further restricts the circumferential movement of the expansion plate 4.

[0036] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached 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 in an upward and downward sliding manner in the vertical groove (22); 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).

2. A dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 1, characterized in that: An upper guide surface (42) is provided at a circumferential position near the lower end of the expansion plate (4); the upper end of the supplementary plate (6) is fixedly connected to a lower guide block (62); a lower guide surface (63) is provided at a circumferential position near the upper 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).

3. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 2, 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).

4. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 2, characterized in that: 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).

5. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 4, characterized in that: 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).

6. 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.

7. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 6, 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).

8. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 4, 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).

9. The dual-machine co-extrusion plastic mesh material forming rotating head mechanism according to claim 4, 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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