Softening device for blended anti-crease yarn

Abstract

The utility model discloses a kind of hemp fiber blended anti-crease yarn softening treatment devices, including shell, the inside of shell is equipped with workbench, the middle part of workbench is installed with soaking groove, symmetrically distributed pressure roller is rotatably connected between the front and rear inner wall of soaking groove, the right side wall of shell is equipped with outlet, further including pretreatment mechanism;Pretreatment mechanism: it includes main shaft, collar, arc plate, installation groove, copper column, sliding block and silica gel strip, the inside left end of shell is rotatably connected with main shaft, the outer arc surface of main shaft is equipped with evenly distributed collar, the opposite inner side outer arc surface of two front and rear adjacent collars is equipped with arc plate, this hemp fiber blended anti-crease yarn softening treatment device, local heating pretreatment realizes hemp fiber softening and gap puffing to promote softening agent penetration efficiency while adjustable structure adaptation different diameter yarn with the linkage of sliding block and collar, L-shaped rod guidance, solve the uneven heating and the deficiency of weak equipment adaptability.

Description

Technical Field

[0001] This utility model relates to the field of hemp fiber blended wrinkle-resistant yarn treatment technology, specifically a hemp fiber blended wrinkle-resistant yarn softening treatment device. Background Technology

[0002] As one of the core pillars of the global economy and light industry system, the textile industry is facing increasing demands for functionality and comfort in yarn products due to consumption upgrades and the popularization of green textile concepts. Hemp fiber, with its excellent properties such as natural environmental friendliness, moisture absorption and breathability, wear resistance, wrinkle resistance, and antibacterial properties, has become a key development direction in the textile raw material field in recent years. In particular, hemp fiber blended with fibers such as cotton, polyester, and spandex to create wrinkle-resistant yarns not only retains the natural advantages of hemp fiber but also improves the wrinkleability of pure hemp yarn through blending processes. These blends are widely used in high-end clothing, home textiles, and outdoor functional fabrics. However, hemp fiber itself has natural properties such as high crystallinity, dense molecular structure, and strong rigidity. Even after blending and wrinkle-resistant finishing, the yarn is still prone to problems such as a stiff hand feel and rough touch, directly affecting the wearing experience and added value of downstream fabrics. Therefore, efficient and uniform softening treatment of hemp fiber blended wrinkle-resistant yarns has become a key process for enhancing their market competitiveness and expanding application scenarios, and is also an important research direction in the current textile post-processing technology field.

[0003] Currently, the mainstream technical approach for softening hemp fiber blended wrinkle-resistant yarns in the industry revolves around "heat pretreatment + softener immersion and penetration + drying and curing." The supporting equipment has formed a standardized operating procedure, and the specific process is as follows: First, based on the yarn's blend ratio (e.g., hemp / cotton, hemp / polyester) and the target softness, a special softener containing cationic surfactants or siloxane composite formulations is prepared and injected into the equipment's immersion tank, maintaining a stable liquid level. Then, the traction system is activated, using traction rollers to move the yarn to be treated at a uniform speed (usually 0.5-0.8 m / min). Before entering the immersion tank, a hot air blower is used to pre-treat the yarn. The heating pretreatment process involves using hot air to transfer heat and initially soften the hemp fibers. The pretreated yarn then enters an immersion tank, where it is completely submerged in softener under the guidance of rollers. The preset immersion time of 15-40 seconds allows the active ingredients of the softener to undergo physical adsorption and chemical reactions with the hemp fiber surface, reducing the coefficient of friction between fibers. After exiting the immersion tank, excess softener is removed from the surface by a scraper or brush roller to prevent softener clumping or uneven residue during subsequent drying. Finally, the yarn is fed into an external hot air dryer by a traction system, where high-temperature curing allows the softener to adhere stably to the fiber surface, ultimately improving the yarn's softness.

[0004] While existing technologies can perform basic softening treatment on hemp fiber blended wrinkle-resistant yarns, there are still three areas for improvement in practical applications: insufficient efficiency and uniformity of heating pretreatment; when using a hot air blower for large-area heating, the heat is easily dispersed and difficult to apply precisely to the yarn body, resulting in uneven heating in different areas of the yarn, insufficient fiber softening in some areas, and differences in the subsequent penetration effect of softener; at the same time, large-area heating also causes energy waste and increases processing costs. To address these issues, we propose a softening treatment device for hemp fiber blended wrinkle-resistant yarns. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a softening treatment device for hemp fiber blended anti-wrinkle yarn. The device achieves softening and gap expansion of hemp fibers through local heating pretreatment to improve the penetration efficiency of softener. At the same time, the adjustable structure with linkage between slider and collar and L-shaped rod guide can adapt to yarns of different diameters, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a softening treatment device for hemp fiber blended anti-wrinkle yarn, comprising a shell, a workbench inside the shell, an soaking tank installed in the middle of the workbench, symmetrically distributed pressure rollers rotatably connected between the front and rear inner walls of the soaking tank, an outlet on the right side wall of the shell, and a pretreatment mechanism.

[0007] The pretreatment mechanism includes a main shaft, collars, arc plates, mounting grooves, copper pillars, sliders, and silicone strips. The main shaft is rotatably connected to the inner left end of the housing. The outer arc surface of the main shaft is fitted with uniformly distributed collars. The outer arc surfaces of the two adjacent collars are each equipped with arc plates. Heating components are installed inside the arc plates. Mounting grooves are opened in the middle of the arc plates. Uniformly distributed copper pillars are rotatably connected between the upper and lower inner walls of the mounting grooves. The inlet on the left side wall of the housing is slidably connected to uniformly distributed sliders. The inner surfaces of the two adjacent sliders are each equipped with silicone strips. The sliders are all configured to cooperate with the adjacent collars on the right side. Local heating pretreatment achieves softening of hemp fibers and gap expansion to improve the penetration efficiency of softener. At the same time, the adjustable structure of slider and collar linkage and L-shaped rod guidance adapts to yarns of different diameters, solving the shortcomings of uneven heating and weak equipment adaptability in the prior art.

[0008] Furthermore, a microcontroller is mounted on the front side of the workbench, and the input terminal of the microcontroller is electrically connected to an external power supply for stable control.

[0009] Furthermore, the pretreatment mechanism also includes a rotating ring and a connecting post. The rotating ring is rotatably connected to the outer arc surface of the collar. The outer arc surface of the rotating ring is fixedly connected to the right side surface of the adjacent slider on the left, which facilitates the linkage between the slider and the collar.

[0010] Furthermore, the outer arc surface of the main shaft is provided with ribs, and the inner arc surface of the collar is provided with rib grooves. The rib grooves are slidably connected to the ribs to ensure that the shaft can rotate while sliding.

[0011] Furthermore, a servo motor is installed on the rear side of the housing. The output shaft of the servo motor is fixedly connected to the center of the rear end face of the main shaft. The input end of the servo motor is electrically connected to the output end of the microcontroller for stable driving.

[0012] Furthermore, the heating component is a heating wire, which is installed inside the arc-shaped plate. The input end of the heating wire is electrically connected to the output end of the microcontroller. A surface-mount temperature sensor is installed on the left end plane of the arc-shaped plate. The surface-mount temperature sensor is bidirectionally electrically connected to the microcontroller for temperature control.

[0013] Furthermore, the upper left side of the workbench is provided with symmetrically distributed sliding grooves, and L-shaped rods are slidably connected inside the sliding grooves. The front end of each L-shaped rod is a ring, and the middle part of each L-shaped rod is fixedly connected to the outer arc surface of a laterally adjacent rotating ring for guidance.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the softening treatment device for hemp fiber blended wrinkle-resistant yarn has the following advantages:

[0015] The main shaft drives the arc plate to swing, allowing the copper column to conduct heat to the yarn, achieving softening of hemp fibers and expansion of gaps, laying the foundation for the penetration of softener; the slider and collar are linked by the connecting column, and the L-shaped rod slides in the groove, which can flexibly adapt to yarns of different diameters, and multiple independent channels can process multiple yarns simultaneously, improving equipment compatibility and processing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a partial cross-sectional view of the left side of the present invention.

[0018] Figure 3 This is a partially enlarged structural diagram of part A of this utility model;

[0019] Figure 4 This is a partially enlarged structural diagram of section B of this utility model;

[0020] Figure 5 This is a partial cross-sectional view of the right end of the present invention.

[0021] Figure 6 This is a partial structural schematic diagram of the pretreatment mechanism of this utility model.

[0022] In the diagram: 1. Outer shell; 2. Pre-treatment mechanism; 21. Main spindle; 211. Rib; 22. Collar; 221. Rib groove; 23. Arc plate; 24. Mounting groove; 25. Copper column; 26. Rotary ring; 27. Slider; 28. Silicone strip; 29. ​​Connecting column; 3. L-shaped rod; 301. Circular ring; 4. Worktable; 5. Slide groove; 6. Immersion tank; 7. Press roller; 8. Inlet; 9. Outlet; 10. Servo motor; 11. Patch temperature sensor; 12. Heating wire; 13. Microcontroller. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6 This embodiment provides a technical solution: a softening device for hemp fiber blended wrinkle-resistant yarn, including a housing 1 (the front side wall of the housing 1 has evenly distributed doors connected by hinges, and each door is equipped with a locking mechanism between its end away from the hinge and the front side wall of the housing 1; the locking mechanism is a commonly used locking mechanism in the prior art), a microcontroller 13 is installed on the front side of a workbench 4, the input terminal of the microcontroller 13 is electrically connected to an external power source, the workbench 4 is located inside the housing 1, and a soaking tank 6 is installed in the middle of the workbench 4 (the right side of the soaking tank 6...). The inner side wall is provided with a lower scraper, and the front and rear sides of the lower scraper are fixedly connected with mounting plates. An upper scraper is slidably connected between the two mounting plates. The middle of the front mounting plate is threaded with a first tightening screw, and the rear end of the first tightening screw contacts the front side of the upper scraper. The front and rear inner walls of the soaking tank 6 are rotatably connected with symmetrically distributed pressure rollers 7 (the pressure rollers 7 are rubber pressure rollers, and the rear inner wall of the soaking tank 6 is provided with a liquid level line, and the pressure rollers 7 are all located below the liquid level line). The right side wall of the outer shell 1 is provided with an outlet 9, and it also includes a pretreatment mechanism 2.

[0025] Pre-processing mechanism 2 includes a main shaft 21, collars 22, arc-shaped plates 23, mounting grooves 24, copper pillars 25, sliders 27, and silicone strips 28. The main shaft 21 is rotatably connected to the inner left end of the outer casing 1. The outer arc surface of the main shaft 21 is fitted with evenly distributed collars 22. The outer arc surfaces of the opposite inner sides of two adjacent collars 22 are each provided with an arc-shaped plate 23. Each arc-shaped plate 23 is equipped with a heating component, which is a heating wire 12. The heating wires 12 are respectively installed inside the arc-shaped plates 23. The input ends of the heating wires 12 are electrically connected to the output ends of the microcontroller 13. Each left end plane of the arc-shaped plate 23 is equipped with a surface-mount temperature sensor 11. The surface-mount temperature sensor 11 is bidirectionally electrically connected to the microcontroller 13. Each arc-shaped plate 23 has a mounting groove 24 in the middle. The upper and lower inner walls of the mounting groove 24 are rotatably connected with evenly distributed copper pillars 25. The inlet 8 on the left side wall of the outer casing 1 is slidably connected with evenly distributed sliders 27 (each slider 27 has a second tightening screw threaded to its upper end, and the right end of the second tightening screw contacts the left side of the outer casing 1). Silicone strips 28 are provided on the opposing inner surfaces of two adjacent sliders 27. Each slider 27 is fitted with an adjacent collar 22 on its right side. The pretreatment mechanism 2 also includes a rotating ring 26 and connecting pillars 29. The rotating rings 26 are rotatably connected to the outer arc surface of the collar 22. Connecting pillars 29 are fixedly connected between the outer arc surface of the rotating ring 26 and the right side of the adjacent slider 27 on the left side. Ribs 211 are provided on the outer arc surface of the main shaft 21, and ribs 211 are provided on the inner arc surface of the collar 22. Rib groove 221, rib groove 221 is slidably connected to rib 211. Servo motor 10 is installed on the rear side of the outer shell 1. The output shaft of servo motor 10 is fixedly connected to the center of the rear end face of main shaft 21. The input end of servo motor 10 is electrically connected to the output end of microcontroller 13. Symmetrically distributed sliding grooves 5 are opened on the left side of the upper side of workbench 4. L-shaped rods 3 are slidably connected inside the sliding grooves 5. The front end of each L-shaped rod 3 is a circular ring 301. The middle part of each L-shaped rod 3 is fixedly connected to the outer arc surface of the horizontally adjacent rotating ring 26. First, the worker opens the lock and then opens all the doors, pours softener into the soaking tank 6, and observes the softener level through the level line to ensure that the pressure roller 7 is completely immersed in the softener. Multiple hemp fiber blended anti-wrinkle yarns are introduced from the inlet 8 on the left side of the outer shell 1. The slide block 27 inside the inlet forms an independent channel through "adjacent pairing". The position of the slide block 27 is then adjusted so that the silicone strip 28 on the inner side of the slide block 27 fits against the yarn surface. During the movement of the slide block 27, the slide block 27, rotating ring 26, and connecting column 29 are linked, causing the collar 22 to drive the arc plate 23 to move synchronously. Simultaneously, the L-shaped rod 3, fixedly connected to the rotating ring 26, slides within the groove 5 of the worktable 4. After adjusting the position of the slide block 27, the second tightening screw is tightened to maintain the position of the slide block 27. Then, the right end of the hemp fiber blended wrinkle-resistant yarn passes through the left-side ring 301, then between the adjacent arc plates 23, and passes through the right-side ring 301, entering the soaking tank 6 where its height is limited by the pressure roller 7, ensuring it remains immersed in the softener.Subsequently, the rightmost end of the hemp fiber blended wrinkle-resistant yarn is pulled out through outlet 9 by an external traction roller at a traction speed of 0.6 m / min. The operator sets the pretreatment heating temperature via the interface of the microcontroller 13, typically 70-90℃ depending on the hemp blend ratio, to avoid damaging the wrinkle-resistant resin. The microcontroller 13 outputs current to the heating wire 12, energizing the heating wire 12 inside the arc-shaped plate 23. Simultaneously, the surface-mount temperature sensor 11 on the left end of the arc-shaped plate 23 collects temperature data in real time and feeds it back to the microcontroller 13, forming a closed-loop control—when the temperature... When the preset value is reached, the power of the heating wire 12 is reduced to the heat preservation state. If the temperature exceeds ±2℃, the microcontroller 13 will automatically cut off part of the current to the heating wire 12 to ensure the pretreatment temperature is stable. The microcontroller 13 outputs a drive signal to the servo motor 10. The output shaft of the servo motor 10 drives the spindle 21 to swing 180 degrees in both directions. The ribs 211 on the outer arc surface of the spindle 21 are slidably connected to the rib grooves 221 on the inner arc surface of the collar 22, ensuring that the collar 22 rotates synchronously with the spindle 21. The arc plate 23 between adjacent collars 22 rotates synchronously with the collar 22. The copper pillar 25 in the middle mounting groove 24 absorbs heat and comes into contact with the yarn. The heat is transferred to the yarn through heat conduction. The hemp fibers soften due to heating, and the gaps between the fibers swell slightly, laying the foundation for subsequent softener penetration. The pre-treated yarn enters the soaking tank 6. Because the pressure rollers 7 are rotated and connected to the front and rear inner walls of the soaking tank 6 and are completely submerged in the softener liquid, the yarn passes between the two sets of pressure rollers 7 under the traction action and is completely pressed into the softener by the pressure rollers 7. The soaking time is 10-30 seconds because the yarn traction speed is 0.6 m / min. The yarn, with a length of 300mm on each side, allows the softener to fully penetrate the gaps in the expanded hemp fibers. After exiting the pressure roller 7, the yarn first passes through the "scraper assembly" on the right side of the soaking tank 6: the lower scraper is fixed, and the upper scraper's height is adjusted to match the yarn diameter via the first tightening screw on the front mounting plate, with a spacing 0.2mm smaller than the yarn diameter. The upper and lower scrapers work together to scrape off excess softener from the yarn surface, and the yarn exits from the outlet 9 on the right side of the outer casing 1. The outlet can be connected to a subsequent drying and curing system, such as an external yarn dryer, to complete the curing and shaping of the softener, facilitating yarn pretreatment.

[0026] The working principle of the softening device for hemp fiber blended wrinkle-resistant yarn provided by this utility model is as follows: First, the worker opens all the doors after unlocking the lock, and pours softener into the soaking tank 6. The softener level is observed through the level line to ensure that the pressure roller 7 is completely immersed in the softener. Multiple hemp fiber blended wrinkle-resistant yarns enter from the inlet 8 on the left side of the outer shell 1. The sliders 27 inside the inlet form independent channels through "adjacent pairing". Then, the position of the sliders 27 is adjusted so that the silicone strip 28 on the inner side of the sliders 27 fits against the surface of the yarn. During the movement of the sliders 27, the sliders 27, the rotating ring 26 and the connecting column 29 are linked, and the collar 22 drives the arc plate 23 to move synchronously. At the same time, it moves in conjunction with the rotating ring 26. The L-shaped rod 3, fixedly connected to ring 26, slides within the groove 5 of the worktable 4. After adjusting the position of slider 27, tighten the second tightening screw to maintain the position of slider 27. Then, the right end of the hemp fiber blended wrinkle-resistant yarn passes through the left ring 301, then through the adjacent arc plates 23, and passes through the right ring 301, entering the soaking tank 6 where its height is limited by the pressure roller 7, remaining constantly immersed in the softener. Subsequently, the rightmost end of the hemp fiber blended wrinkle-resistant yarn is pulled out through outlet 9 by an external traction roller at a traction speed of 0.6 m / min. The operator sets the pretreatment heating temperature through the interactive interface of the single-chip microcomputer 13, typically 70-90 degrees Celsius depending on the hemp blend ratio. To prevent damage to the anti-wrinkle resin, the microcontroller 13 outputs current to the heating wire 12, energizing the heating wire 12 inside the arc plate 23. Simultaneously, the surface-mount temperature sensor 11 on the left end of the arc plate 23 collects temperature data in real time and feeds it back to the microcontroller 13, forming a closed-loop control. When the temperature reaches the preset value, the power of the heating wire 12 is reduced to a heat preservation state. If the temperature exceeds ±2℃, the microcontroller 13 automatically cuts off part of the current to the heating wire 12 to ensure stable pretreatment temperature. The microcontroller 13 outputs a drive signal to the servo motor 10, and the output shaft of the servo motor 10 drives the spindle 21 to swing 180 degrees in both directions. The ribs 211 on the outer arc surface of the spindle 21 and the rib grooves 2 on the inner arc surface of the collar 22... 21 Sliding connection ensures that collar 22 rotates synchronously with main shaft 21. The arc plate 23 between adjacent collars 22 rotates synchronously with collar 22. The copper column 25 in the mounting groove 24 in the middle of the arc plate 23 absorbs heat and comes into contact with the yarn. The heat is transferred to the yarn through heat conduction. The hemp fibers soften due to heating, and the gaps between the fibers swell slightly, laying the foundation for subsequent softener penetration. The heated and pretreated yarn enters soaking tank 6. Since the pressure rollers 7 are rotated and connected to the front and rear inner walls of soaking tank 6 and are completely immersed in softener liquid, the yarn passes between the two sets of pressure rollers 7 under traction and is completely pressed into the softener by the pressure rollers 7. The soaking time is 10-30 seconds due to the yarn traction speed of 0.The speed is 6 m / min. The length of the soaking tank 6 is approximately 300 mm. The softener fully penetrates into the gaps between the swollen hemp fibers. After the yarn exits from the pressure roller 7, it first passes through the "scraper assembly" on the right side of the soaking tank 6: the lower scraper is fixed, and the upper scraper's height is adjusted to match the yarn diameter via the first tightening screw on the front mounting plate. The spacing is 0.2 mm smaller than the yarn diameter. The upper and lower scrapers work together to scrape off excess softener from the yarn surface, and the yarn is discharged from the outlet 9 on the right side of the outer casing 1. The outlet can be connected to a subsequent drying and curing system, such as an external yarn dryer, to complete the curing and shaping of the softener.

[0027] It is worth noting that the servo motor 10 disclosed in the above embodiments can be the MINASA6 series, the surface mount temperature sensor 11 can be the DS18B20 surface mount board, the heating wire 12 can be a nickel-chromium alloy heating wire, and the microcontroller 13 can be the STC89C52RC. The microcontroller 13 controls the operation of the servo motor 10, the surface mount temperature sensor 11 and the heating wire 12 using methods commonly used in the prior art.

[0028] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A softening device for hemp fiber blended anti-wrinkle yarn, comprising a housing (1), wherein a workbench (4) is provided inside the housing (1), a soaking tank (6) is installed in the middle of the workbench (4), and symmetrically distributed pressure rollers (7) are rotatably connected between the front and rear inner walls of the soaking tank (6), and an outlet (9) is provided on the right side wall of the housing (1), characterized in that: It also includes a pretreatment facility (2); Pre-treatment mechanism (2): It includes a main shaft (21), a collar (22), an arc plate (23), a mounting groove (24), a copper column (25), a slider (27), and a silicone strip (28). The main shaft (21) is rotatably connected to the inner left end of the outer shell (1). The outer arc surface of the main shaft (21) is fitted with a uniformly distributed collar (22). The outer arc surfaces of the two adjacent collars (22) are provided with arc plates (23). The interior of the arc plates (23) is provided with heating components. The middle part of the arc plates (23) is provided with a mounting groove (24). The upper and lower inner walls of the mounting groove (24) are rotatably connected with uniformly distributed copper columns (25). The interior of the inlet (8) opened on the left side wall of the outer shell (1) is slidably connected with uniformly distributed sliders (27). The inner surfaces of the two adjacent sliders (27) are provided with silicone strips (28). The sliders (27) are all matched with the adjacent collars (22) on the right side.

2. The softening device for hemp fiber blended wrinkle-resistant yarn according to claim 1, characterized in that: A microcontroller (13) is mounted on the front side of the workbench (4), and the input terminal of the microcontroller (13) is electrically connected to an external power source.

3. The softening device for hemp fiber blended wrinkle-resistant yarn according to claim 1, characterized in that: The pretreatment mechanism (2) also includes a rotating ring (26) and a connecting column (29). The rotating ring (26) is rotatably connected to the outer arc surface of the collar (22). The outer arc surface of the rotating ring (26) is fixedly connected to the right side of the adjacent slider (27) on the left.

4. The softening device for hemp fiber blended wrinkle-resistant yarn according to claim 1, characterized in that: The outer arc surface of the main shaft (21) is provided with ribs (211), and the inner arc surface of the collar (22) is provided with rib grooves (221). The rib grooves (221) are slidably connected to the ribs (211).

5. The softening device for hemp fiber blended wrinkle-resistant yarn according to claim 2, characterized in that: A servo motor (10) is installed on the rear side of the housing (1). The output shaft of the servo motor (10) is fixedly connected to the center of the rear end face of the main shaft (21). The input end of the servo motor (10) is electrically connected to the output end of the microcontroller (13).

6. The softening device for hemp fiber blended wrinkle-resistant yarn according to claim 2, characterized in that: The heating component is a heating wire (12), which is installed inside the arc plate (23). The input end of the heating wire (12) is electrically connected to the output end of the microcontroller (13). The left end plane of the arc plate (23) is equipped with a patch temperature sensor (11), which is bidirectionally electrically connected to the microcontroller (13).

7. The softening device for hemp fiber blended wrinkle-resistant yarn according to claim 3, characterized in that: The upper side of the workbench (4) has symmetrically distributed sliding grooves (5) at the left end. Each of the sliding grooves (5) is slidably connected to an L-shaped rod (3). The front end of each L-shaped rod (3) is a circular ring (301), and the middle part of each L-shaped rod (3) is fixedly connected to the outer arc surface of the horizontally adjacent rotating ring (26).

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