Planting frame with limiting structure
By designing a planting rack with a limit structure, the problems of unsatisfactory growth direction and lack of bird-proofing functions in the early stage of vines are solved, and more orderly vine growth and fruit protection are achieved, and planting efficiency and yield are improved.
Patent Information
- Application Number
- CN202422105911.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-29
AI Technical Summary
The existing kiwi fruit planting racks are not ideal in the early stage of vines, which increases management difficulty and lacks bird invasion function, resulting in damage to the fruit and reducing yield and quality.
A planting frame with a limit structure is designed, including active external columns, driven external columns, inner rods and beams connected by sliders. The top of the beam is equipped with adjustment components and branch rod fixers, and the limit side plate and top plate are used to support and prevent birds.
By adjusting the lifting structure of the components and inner rods, the growth direction of vines can be effectively controlled, reducing management difficulty; the branch rod fixing device is adapted to vines of different thicknesses and provides buffer protection; the limit edge plate and top plate prevent birds from invasion and ensure fruit integrity.
Smart Images
Figure CN222928906U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of kiwifruit planting, in particular to a planting frame with a limiting structure. Background Technique
[0002] Kiwifruit is a kind of fruit, usually oval in shape, covered with a fine layer of fluff on the surface, mostly brownish in color, its pulp is green or yellow, soft in texture, delicious in taste, rich in nutritional ingredients such as vitamin C, vitamin K, dietary fiber, various minerals and antioxidants. Due to its many advantages, its planting is quite extensive.
[0003] A planting frame is usually a structural device built to support, fix and guide the growth of plants during planting, composed of different materials such as wood, metal, plastic, etc., with different shapes and designs to adapt to the growth needs and planting environments of different plants.
[0004] The inventor found the following problems in the prior art during the implementation of the present utility model: 1. Most of the current kiwifruit planting frames are T-shaped, with a simple structure. However, the vines spread from bottom to top. In many cases, the beam frame at the top cannot be adjusted, and the vines must grow to a certain height before they can be fixed to the beam frame, which will lead to an unsatisfactory initial growth direction of the vines and increase the management difficulty; 2. Due to the existence of the above problems, some planters may use external support objects to fix the vines, but some supports are rough and easy to damage the vines, and many planting frames lack the function of preventing birds from invading, which will lead to the problem of fruit damage in the later stage, reducing the yield and quality. Content of the Utility Model
[0005] The purpose of the present utility model is to provide a planting frame with a limiting structure to solve the problems mentioned in the above background technique that the vines must grow to a certain height before they can be fixed to the beam frame, which will lead to an unsatisfactory initial growth direction of the vines and increase the management difficulty, and that many planting frames lack the function of preventing birds from invading. To achieve the above purpose, the present utility model provides the following technical solution: A planting frame with a limiting structure, including an active outer column, a driven outer column is arranged on one side of the active outer column, a first inner rod is slidably connected to the inside of the active outer column through a slider, a second inner rod is slidably connected to the inside of the driven outer column through a slider, the first inner rod and the second inner rod are connected by a cross beam, an adjusting component is arranged on the outer wall of one side of the top of the active outer column, a number of equally spaced branch rod fixers are arranged between the inner walls of the cross beam, and limiting side plates are arranged at both ends of the bottom of the cross beam.
[0006] Connectors are respectively provided at both ends of the cross beam. The cross beam is threadedly connected between the first inner rod and the second inner rod through the connectors. A top plate is inserted and connected to the top of the cross beam. Connection blocks for limiting side plates are respectively provided at both ends of the bottom of the cross beam.
[0007] A gear and a ratchet are rotatably connected inside the adjusting assembly. The gear and the ratchet are coaxially connected. A pawl is meshed and connected to the top of the ratchet. One end of the top of the pawl is adhesively connected to an unlocking pull rod through a spring.
[0008] The branch rod fixer includes a first fixing ring and a second fixing ring. One side of the first fixing ring is adhesively connected to the inner wall of the cross beam before. The first fixing ring and the second fixing ring are connected through a hinge. A cylindrical limiting block is provided on one side of the outer wall of the first fixing ring. An arc-shaped block for snap-fitting connection with the cylindrical limiting block is provided at a corresponding position on one side of the outer wall of the second fixing ring.
[0009] Upper connection grooves and lower connection blocks are respectively provided at the top and bottom of the limiting side plate. The limiting side plate is inserted and connected to the inside of the connection block for the limiting side plate through the upper connection groove. External hooks are respectively provided on both sides of the outer wall of the limiting side plate.
[0010] Further preferably, the bottoms of the active outer column and the driven outer column are respectively trapezoidal, and a plurality of pile nails are distributed below the largest trapezoidal surface. A through hole for rotatably connecting the gear is provided through the corresponding position of the top of the active outer column.
[0011] Further preferably, a rack for meshing connection with the gear is provided on one side of the outer wall of the first inner rod. The first inner rod forms a transmission structure through the gear. The ratchet forms a rotating structure through the gear. At the same time, the pawl forms a reciprocating motion on the surface of the ratchet. One end of the pawl forms a lifting structure on the surface of the ratchet through the unlocking pull rod. The unlocking pull rod forms an elastic reset structure through the spring.
[0012] Further preferably, the first inner rod forms a lifting structure inside the active outer column through the adjusting assembly. The second inner rod forms a lifting structure inside the driven outer column. The cross beam is slidably connected to the chutes provided on the outer walls of the active outer column and the driven outer column through the first inner rod and the second inner rod.
[0013] Further preferably, the surfaces of the top plate and the limiting side plate are respectively in a state of being staggered in a grid pattern. A plurality of through holes for inserting and connecting the top plate are equidistantly provided on the top of the cross beam. A plurality of slender and sharp metal pieces are equidistantly distributed on the top of the top plate.
[0014] Further preferably, the lower connecting block and the limiting side plate connecting block have the same shape and specification and are both in a T shape, and the limiting side plate is connected to another set of limiting side plates through the insertion connection of the upper connecting groove and the lower connecting block.
[0015] Further preferably, the second fixing ring is rotatably connected to the first fixing ring through a hinge and forms an opening and closing structure with it, and elastic members are respectively coated on the inner walls of the first fixing ring and the second fixing ring, and ventilation holes are respectively formed through the first fixing ring, the second fixing ring and the elastic members on their inner walls.
[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0017] In the present utility model, the top plate on the cross beam effectively prevents birds from perching and pecking at the fruits growing later. Its grid-like structure can ensure good light transmittance, which is beneficial to the photosynthesis of the vegetation below during the planting period. And the limiting side plates on both sides can limit the excessive expansion of the vines to both sides, enabling the vines to grow along the preset direction, which helps to achieve a more orderly and efficient planting layout. At the same time, its modular splicing structure helps to adjust according to the growth cycle of the vegetation. And due to the elasticity of the branch rod fixator, it can adapt to vines of different thicknesses, play a certain buffering and protective role for them, and the ventilation holes formed through the surface help the air to circulate, reducing the possibility of diseases occurring at the fixed parts of the vines due to stuffiness or dampness.
[0018] In the present utility model, the structural forms at the bottoms of the active outer column and the driven outer column increase the contact area with the ground and improve the stability of the use of the whole planting rack. The cross beam is adjusted from the lowest point to the highest point through the first inner rod, so as to adjust according to the growth cycle of the vines. Compared with the general way of fixing after growing to a certain situation, the initial fixing is adopted, effectively avoiding the phenomenon that it is difficult to adjust later. At the same time, the synchronism of the first inner rod and the second inner rod provides uniform and symmetrical support for the vines, which is beneficial to the balanced growth of the vines and the uniform distribution of the fruits. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is the front view structural schematic diagram of the present utility model;
[0020] Figure 2 is the internal structural schematic diagram of the active outer column of the present utility model;
[0021] Figure 3 is the internal structural schematic diagram of the adjusting assembly of the present utility model;
[0022] Figure 4 is the structural schematic diagram of the cross beam of the present utility model;
[0023] Figure 5 is the structural schematic diagram of the branch rod fixator of the present utility model;
[0024] Figure 6 This is a schematic diagram of the limiting side plate structure of the utility model.
[0025] In the figure: 1, the active outer column; 2, the driven outer column; 3, the first inner rod; 4, the second inner rod; 5, the cross beam; 501, the connecting piece; 502, the top plate; 503, the limiting side plate connecting block; 6, the adjusting assembly; 601, the gear; 602, the ratchet; 603, the pawl; 604, the unlocking pull rod; 7, the branch rod fixer; 701, the first fixing ring; 702, the second fixing ring; 703, the cylindrical limiting block; 704, the arc-shaped clamping block; 8, the limiting side plate; 801, the upper connecting groove; 802, the lower connecting block; 803, the external hanging hook. Specific embodiments
[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0027] Please refer to Figures 1 to 6 , the present utility model provides a technical solution: a planting rack with a limiting structure, including an active outer column 1, a driven outer column 2 is provided on one side of the active outer column 1, a first inner rod 3 is slidably connected to the inside of the active outer column 1 through a slider, a second inner rod 4 is slidably connected to the inside of the driven outer column 2 through a slider, the first inner rod 3 and the second inner rod 4 are connected by a cross beam 5, an adjusting assembly 6 is provided on the outer wall of one side of the top of the active outer column 1, a plurality of equally spaced branch rod fixers 7 are provided between the inner walls of the cross beam 5, and limiting side plates 8 are provided at both ends of the bottom of the cross beam 5.
[0028] Connecting pieces 501 are respectively provided at both ends of the cross beam 5, and the cross beam 5 is respectively threadedly connected between the first inner rod 3 and the second inner rod 4 through the connecting pieces 501, a top plate 502 is inserted and connected to the top of the cross beam 5, and limiting side plate connecting blocks 503 are respectively provided at both ends of the bottom of the cross beam 5.
[0029] A gear 601 and a ratchet 602 are rotatably connected inside the adjusting assembly 6, the gear 601 and the ratchet 602 are coaxially connected, a pawl 603 is meshed with the top of the ratchet 602, and one end of the top of the pawl 603 is adhesively connected to an unlocking pull rod 604 through a spring.
[0030] The branch rod fixer 7 includes a first fixing ring 701 and a second fixing ring 702. Before one side of the first fixing ring 701 is adhesively connected to the inner wall of the cross beam 5, the first fixing ring 701 and the second fixing ring 702 are connected by a hinge. A cylindrical limiting block 703 is provided on one side of the outer wall of the first fixing ring 701, and an arc-shaped clamping block 704 for clamping and connecting the cylindrical limiting block 703 is provided at a corresponding position on one side of the outer wall of the second fixing ring 702.
[0031] Upper connection grooves 801 and lower connection blocks 802 are respectively provided at the top and bottom of the limiting side plate 8. The limiting side plate 8 is inserted and connected to the inside of the limiting side plate connection block 503 through the upper connection groove 801, and external hooks 803 are respectively provided on both sides of the outer wall of the limiting side plate 8.
[0032] In this embodiment, as Figure 1 and Figure 3 shown, the bottoms of the active outer column 1 and the driven outer column 2 are trapezoidal, and several pile nails are distributed below the largest trapezoidal surface. A through hole for rotatably connecting the gear 601 is provided at a position corresponding to the gear 601 at the top of the active outer column 1; the structural forms of the bottoms of the active outer column 1 and the driven outer column 2 increase the contact area with the ground, improve the stability of the use of the whole planting rack, and the pile nail structure at the bottom further enhances the fixation of the active outer column 1 and the driven outer column 2 in the soil, enabling it to resist the influence of natural factors such as wind and rain.
[0033] In this embodiment, as Figure 2 and Figure 3 shown, a rack for meshing with the gear 601 is provided on one side of the outer wall of the first inner rod 3, and the first inner rod 3 forms a transmission structure through the gear 601. The ratchet 602 forms a rotating structure through the gear 601. At the same time, the ratchet pawl 603 makes a reciprocating motion on the surface of the ratchet 602. One end of the ratchet pawl 603 forms a lifting structure on the surface of the ratchet 602 through the unlocking pull rod 604, and the unlocking pull rod 604 forms an elastic reset structure through a spring; the first inner rod 3 achieves the purpose of transmission by using the meshing structure on its surface with the gear 601, and the cooperation between the ratchet 602 and the ratchet pawl 603 plays a self-locking function, effectively preventing the problem that the first inner rod 3 slips after being adjusted to a certain height. When the planting cycle ends and enters the next cycle, by pulling up the unlocking pull rod 604, one end of the ratchet pawl 603 can be separated from the surface of the ratchet 602, and by rotating in the reverse direction, the first inner rod 3 can be lowered to make the lowest point of the cross beam 5 contribute to providing good vine fixing conditions for the new planting cycle, facilitating subsequent planting management and vine growth guidance.
[0034] In this embodiment, as Figure 1 and Figure 2As shown, the first inner rod 3 forms a lifting structure inside the active outer column 1 through the adjusting component 6, and the second inner rod 4 forms a lifting structure inside the driven outer column 2. Moreover, the cross beam 5 is slidably connected to the chutes opened on the outer walls of the active outer column 1 and the driven outer column 2 through the first inner rod 3 and the second inner rod 4. When the first inner rod 3 realizes lifting through the adjusting component 6, since it is connected to the second inner rod 4 through the cross beam 5, the lifting of the second inner rod 4 is realized. Through synchronous adjustment, the adjustment time and labor cost are effectively saved, and the problem of the cross beam 5 tilting caused by separate adjustment is also reduced. The synchronization of the first inner rod 3 and the second inner rod 4 is always maintained, providing uniform and symmetrical support for the vines, which is beneficial to the balanced growth of the vines and the uniform distribution of the fruits. And compared with the general method of fixing in the initial stage after growing to a certain situation, the phenomenon that it is difficult to adjust later is effectively avoided.
[0035] In this embodiment, as Figure 4 and Figure 6 shown, the surfaces of the top plate 502 and the limiting side plate 8 are respectively in a form of grid-like staggered distribution. A number of through holes for plugging and connecting the top plate 502 are equidistantly opened on the top of the cross beam 5, and a number of slender and sharp metal pieces are equidistantly distributed on the top of the top plate 502. The several through holes on the surface of the cross beam 5 for plugging the top plate 502 facilitate growers to adjust the position of the top plate 502 according to actual needs. The grid-like structure on the surface of the top plate 502 can ensure good light transmittance, which is beneficial to the photosynthesis of the vegetation below during the planting period. And the slender and sharp metal pieces on its top can effectively prevent birds from perching and pecking at the fruits growing later, ensuring the harvest of the fruits.
[0036] In this embodiment, as Figure 6As shown in the figure, the lower connecting block 802 and the limiting side plate connecting block 503 have the same shape and specification, both of which are T-shaped. The limiting side plate 8 is connected to another group of limiting side plates 8 through the insertion connection of the upper connecting groove 801 and the lower connecting block 802. When the cross beam 5 drives the vines fixed for the first time to adjust the height, the limiting side plates 8 on both sides can limit the vines from expanding excessively to both sides, enabling the vines to grow along the preset direction, which helps to achieve a more orderly and efficient planting layout. This regular growth direction facilitates daily management and greatly reduces the pruning time. Moreover, the surface structure form ensures good lighting conditions, and its modular splicing structure through the upper connecting groove 801 and the lower connecting block 802 helps to adjust according to the growth cycle of the vegetation. At the same time, in order to facilitate the maintenance of daily planting personnel, there are no limiting side plates 8 at the other two ends below the cross beam 5. Instead, external hooks 803 are set. During the subsequent planting process, the planting personnel can arrange the mesh through the external hooks 803, which can play a protective role while not affecting the light transmittance, and can also play a certain role in blocking the outward expansion of the vines to a certain extent, and is also convenient for disassembly at any time to facilitate the planting personnel to check the growth status of the plants.
[0037] In this embodiment, as Figure 5 shown, the second fixing ring 702 is rotatably connected to the first fixing ring 701 through a hinge and forms an opening and closing structure with it. Elastic members are respectively coated on the inner walls of the first fixing ring 701 and the second fixing ring 702, and ventilation holes are respectively formed through the first fixing ring 701, the second fixing ring 702 and the elastic members on their inner walls. The opening and closing structure of the first fixing ring 701 and the second fixing ring 702 makes it more convenient to load and unload the branches of the vines. The elastic members coated inside them are made of TPE material, which plays a certain buffering and protective role while fixing the vegetation, and is beneficial to the healthy growth of the vines. Due to its elasticity, it can adapt to vines of different thicknesses, increasing the versatility of the fixation. The ventilation holes formed through the surfaces of the first fixing ring 701 and the second fixing ring 702 help the air to circulate, reducing the possibility of diseases occurring in the fixed parts of the vines due to sultriness or dampness.
[0038] The usage method and advantages of the present utility model: When using the planting rack with a limiting structure, the working process is as follows:
[0039] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown in the figure, when installing the device in the planting area for the first time, ensure that the crossbeam 5 is butted above the kiwifruit saplings. Thread the crossbeam 5 through the connecting parts 501 at both ends thereof into the threaded through holes opened in the first inner rod 3 and the second inner rod 4 respectively, and rotate it until the crossbeam 5 is parallel between the active outer column 1 and the driven outer column 2. Then, drive the pile nails at the bottoms of the active outer column 1 and the driven outer column 2 into the soil layer of the planting area. When the saplings produce the first section of vines during their growth period, fix the vines through several vine holders 7 on the surface of the crossbeam 5. Separate the arc-shaped block 704 from the surface of the cylindrical limit block 703, and separate one end of the second fixing ring 702 from the surface of the first fixing ring 701. Put the vine branches and leaves into the first fixing ring 701, and then close the second fixing ring 702 and the first fixing ring 701 by engaging the arc-shaped block 704 with the cylindrical limit block 703 again. Insert the limiting side plate 8 into the limiting side plate connecting block 503 through the upper connecting groove 801 at its top to install the limiting side plate 8 below the crossbeam 5. At the same time, install the mesh cloth by using the external hooks 803 on both sides of the limiting side plate 8. When the planter regularly checks the plants during the growth process of the plants, the height of the crossbeam 5 can be adjusted according to its growth trend. When the node spacing of the vines is too small and the leaves are dense, the handle outside the adjusting assembly 6 can be rotated to make the gear 601 rotate. Under the coaxial connection, the ratchet 602 rotates. During the rotation of the ratchet 602, the pawl 603 at its top is slightly pressed by a spring, ensuring that it always fits on the ratchet teeth at the top of the ratchet 602, so as to smoothly pass through and push the rotation of the ratchet 602 and effectively prevent reverse rotation, thus playing a self-locking function and preventing the phenomenon of the first inner rod 3 slipping off. As the gear 601 rotates, the first inner rod 3 with a rack on its surface and meshing with the gear 601 continuously rises. At the same time, the second inner rod 4 on one side thereof slides correspondingly inside the driven outer column 2. The planter can adjust the crossbeam 5 to an appropriate height according to needs. The structure above the top plate 502 of the crossbeam 5 can effectively drive away birds when fruits are produced subsequently. The number of limiting side plates 8 is increased correspondingly according to the adjusted height of the crossbeam 5. The vertical splicing between the limiting side plate 8 and another set of limiting side plates 8 can be completed through the insertion connection of the upper connecting groove 801 and the lower connecting block 802, which can effectively prevent the growing vines from expanding on both sides. Moreover, the planting rack is a combined splicing structure, which is convenient for adjustment and migration.
[0040] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present utility model, and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. A planting rack with a limiting structure, comprising an active outer column (1), characterized in that: A driven outer column (2) is provided on one side of the active outer column (1); a first inner rod (3) is slidably connected to the interior of the active outer column (1) via a slider; a second inner rod (4) is slidably connected to the interior of the driven outer column (2) via a slider; the first inner rod (3) and the second inner rod (4) are connected via a crossbeam (5); an adjustment component (6) is provided on the outer wall of one side of the top of the active outer column (1); a plurality of branch rod fixers (7) are equidistantly distributed between the inner walls of the crossbeam (5); and limiting side plates (8) are provided at both ends of the bottom of the crossbeam (5); Connecting pieces (501) are respectively provided at both ends of the cross beam (5), and the cross beam (5) is respectively threadedly connected between the first inner rod (3) and the second inner rod (4) through the connecting pieces (501); a top plate (502) is plugged and connected to the top of the cross beam (5), and limited side plate connecting blocks (503) are respectively provided at both ends of the bottom of the cross beam (5); The adjusting assembly (6) is internally rotatably connected with a gear (601) and a ratchet (602), the gear (601) and the ratchet (602) are coaxially connected, the top of the ratchet (602) is meshedly connected with a pawl (603), and one end of the top of the pawl (603) is glued with an unlocking rod (604) through a spring; The branch rod fixer (7) comprises a first fixing ring (701) and a second fixing ring (702); one side of the first fixing ring (701) is glued to the inner wall of the crossbeam (5); the first fixing ring (701) and the second fixing ring (702) are connected via a hinge; a columnar limiting block (703) is provided on one side of the outer wall of the first fixing ring (701); and an arc-shaped clamping block (704) for clamping and connecting the columnar limiting block (703) is provided at a corresponding position on one side of the outer wall of the second fixing ring (702); The top and bottom of the limiting side plate (8) are respectively provided with an upper connecting groove (801) and a lower connecting block (802); the limiting side plate (8) is plugged into and connected to the inside of the limiting side plate connecting block (503) through the upper connecting groove (801); and external hooks (803) are respectively provided on both sides of the outer wall of the limiting side plate (8).
2. The planting rack with a limiting structure according to claim 1, characterized in that: The bottoms of the active outer column (1) and the driven outer column (2) are respectively in a trapezoidal shape, with a plurality of pegs distributed below the largest part of the trapezoidal surface, and a through hole for rotating the connecting gear (601) is provided through the top of the active outer column (1) corresponding to the position of the gear (601).
3. The planting rack with a limiting structure according to claim 1, characterized in that: A rack for meshing with the gear (601) is provided on one side of the outer wall of the first inner rod (3), and the first inner rod (3) forms a transmission structure through the gear (601), and the ratchet (602) forms a rotating structure through the gear (601), and the pawl (603) forms a reciprocating motion on the surface of the ratchet (602), and one end of the pawl (603) forms a lifting structure on the surface of the ratchet (602) through an unlocking pull rod (604), and the unlocking pull rod (604) forms an elastic reset structure through a spring.
4. The planting rack with a limiting structure according to claim 1, characterized in that: The first inner rod (3) forms a lifting structure inside the active outer column (1) through an adjustment component (6), and the second inner rod (4) forms a lifting structure inside the driven outer column (2), and the crossbeam (5) is slidably connected to a slide groove provided on the outer wall of the active outer column (1) and the driven outer column (2) through the first inner rod (3) and the second inner rod (4).
5. The planting rack with a limiting structure according to claim 1, characterized in that: The surfaces of the top plate (502) and the limiting side plate (8) are respectively arranged in a grid-like staggered distribution, and a plurality of through holes for plugging and connecting the top plate (502) are arranged at equal distances on the top of the crossbeam (5), and a plurality of slender and sharp metal parts are distributed at equal distances on the top of the top plate (502).
6. The planting rack with a limiting structure according to claim 1, characterized in that: The lower connecting block (802) and the limiting side plate connecting block (503) have the same shape and specifications and are both T-shaped, and the limiting side plate (8) is connected to another set of limiting side plates (8) through the plug-in connection of the upper connecting groove (801) and the lower connecting block (802).
7. The planting rack with a limiting structure according to claim 1, characterized in that: The second fixing ring (702) is rotatably connected to the first fixing ring (701) via a hinge and forms an opening and closing structure therewith, and the inner walls of the first fixing ring (701) and the second fixing ring (702) are respectively covered with elastic parts, and the first fixing ring (701) and the second fixing ring (702) and the elastic parts on their inner walls are respectively penetrated by ventilation holes.