Placing rack

By designing a placement rack with multiple short sections and elastic protective layer, the problem of magnetic rods being absorbed and worn in the placement rack is solved, and the convenience and safety of orderly storage and operation of magnetic rods are achieved.

CN222876539UActive Publication Date: 2025-05-16KANGMEI PHARMA
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Patent Information

Application Number
CN202421644880.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-11
Publication Date
2025-05-16
Estimated Expiration
2034-07-11

AI Technical Summary

Technical Problem

In the prior art, magnetic rods are easily absorbed together in the placement rack, resulting in inconvenience in use and wear during pick-up and placement.

Method used

A placement rack is designed, and its frame body has multiple storage holes, which are divided into multiple short sections along its length direction, with gaps arranged, and an elastic protective layer is laid on the inner wall.

Benefits of technology

By dispersing the magnetic rod, the wear between the magnetic rods is reduced, the contact area between the magnetic rods and the inner wall of the storage channel is reduced, the service life of the magnetic rod is extended, and the convenience and safety of operation are improved.

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Abstract

The utility model provides a placing frame, and relates to the field of sorting equipment. The placing rack comprises a rack body, the rack body is provided with a plurality of object placing hole channels, the object placing hole channels can accommodate the magnetic bars, and the plurality of object placing hole channels are arranged at intervals; wherein the storage hole channel is divided into a plurality of short sections in the extending direction of the storage hole channel, a gap is formed between every two adjacent short sections, and an elastic protection layer is arranged on the inner wall of the storage hole channel. The placing rack provided by the utility model can be used for placing the magnetic bar, is convenient to take and place the magnetic bar, can reduce the abrasion of the magnetic bar, and is practical and convenient.
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Description

Technical Field

[0001] The present application relates to the field of sorting equipment, and in particular to a placement rack. Background Art

[0002] Since Chinese medicinal materials are collected by scattered farmers and then sent to suppliers, the raw materials are often mixed with iron products. Most of them use magnetic bars to remove iron products. However, since most of the magnetic bars are directly placed in the rack, the magnetic bars are placed in a centralized manner, which leads to the following problems:

[0003] Once the magnetic bars are attracted together, they are difficult to separate, which causes inconvenience in use; and there is wear and tear between the magnetic bars during the process of taking and placing them. Utility Model Content

[0004] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a placement rack that can be used to place magnetic bars, facilitates the removal and placement of the magnetic bars, reduces the wear of the magnetic bars, and is practical and convenient.

[0005] This application provides the following technical solutions:

[0006] An embodiment of the present application provides a placement rack, the placement rack comprising:

[0007] The frame body has a plurality of storage channels, the storage channels can accommodate magnetic rods, and the plurality of storage channels are arranged at intervals; wherein the storage channels are divided into a plurality of short sections in the extension direction thereof, there are gaps between adjacent short sections, and the inner wall of the storage channels is provided with an elastic protective layer.

[0008] In one embodiment, the storage channel has an open end, and the open end is configured to be flared.

[0009] In one of the embodiments, the end of the storage channel away from the open end is the bottom end, and the bottom end is closed; wherein, when the placement rack is in use, the open end of the storage channel is arranged upward.

[0010] In one embodiment, the length of the storage channel is L1, the length of the magnetic rod is L2, and they satisfy: L2>L1.

[0011] In one embodiment, the frame comprises:

[0012] A plurality of support plates and a bottom plate are provided, wherein the support plates and the bottom plate are connected to each other and are spaced apart in the extension direction of the storage channel; wherein the storage channel passes through the support plates.

[0013] In one embodiment, the frame further comprises:

[0014] The elastic protective sleeve, the storage channel passes through the support plate and forms a through opening on the support plate, the elastic protective sleeve is detachably connected to the support plate, and the elastic protective sleeve is inserted into the through opening.

[0015] In one of the embodiments, an elastic pad is provided on a side of the bottom plate facing the support plate.

[0016] In one of the embodiments, a gasket is detachably connected to a side of the support plate facing away from the bottom plate, and the elastic pad and the bottom plate are detachably connected.

[0017] In one embodiment, the bottom end of the storage channel can magnetically adsorb the magnetic rod.

[0018] In one embodiment, the distance L3 between adjacent storage channels satisfies: L3 ≥ 5 cm.

[0019] The embodiments of the present application have the following advantages:

[0020] The present application provides a storage rack, the rack body is designed with a plurality of storage channels, and these storage channels are specially designed to accommodate magnetic bars, so that the magnetic bars can be stored in an orderly manner, avoiding disorder and reducing the wear between the magnetic bars. Each storage channel is divided into a plurality of short sections along its length, and a certain gap is retained between the short sections, thereby reducing the contact area between the magnetic bar and the inner wall of the storage channel to reduce the wear on the magnetic bar. The elastic protective layer laid on the inner wall of the storage channel can not only protect the surface of the magnetic bar from scratches and reduce damage, but also during the process of taking out or putting in the magnetic bar, the elastic layer can provide a certain buffering effect, reduce the impact force that may be generated during the operation, and protect the safety of the magnetic bar and the operator. In addition, the designed gap provides insertion space for the operator's fingers or tools, which is convenient for easy separation and removal of the magnetic bar.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A structural schematic diagram of a placement rack provided by an embodiment of the present application from one perspective is shown;

[0024] Figure 2Another perspective structural schematic diagram of a placement rack provided by an embodiment of the present application is shown;

[0025] Figure 3 A schematic structural diagram of a support plate of a placement rack provided in an embodiment of the present application is shown;

[0026] Figure 4 Shows Figure 3 AA section view in.

[0027] Description of main component symbols:

[0028] 100-frame; 110-support plate; 120-bottom plate; 200-elastic protective layer; 300-through opening; 400-gasket; 500-elastic pad; 600-storage channel. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] In the related art, since Chinese medicinal materials are collected by scattered farmers and then sent to suppliers, the raw materials are often mixed with iron products, and most of them use magnetic bars to remove the iron products. However, since most of the magnetic bars are directly placed in the placement rack, the magnetic bars are placed in a centralized manner, which leads to the following problems: it is difficult to separate the magnetic bars after they are sucked together, which makes them inconvenient to use; and there is wear between the magnetic bars during the process of taking and placing them.

[0035] like Figure 1 and Figure 2 As shown, in order to solve the above technical problems, an embodiment of the present application provides a placement rack, which includes a frame body 100, and the frame body 100 has a plurality of storage channels 600, and the storage channels 600 can accommodate magnetic bars, and the plurality of storage channels 600 are arranged at intervals; wherein, the storage channels 600 are divided into a plurality of short sections in their extension direction, and there are gaps between adjacent short sections, and the inner wall of the storage channels 600 is provided with an elastic protective layer 200.

[0036] In this embodiment, the placement rack provided by the present application disperses the multiple storage channels 600, so that the magnetic bars inserted into the storage channels 600 can be dispersedly placed, thereby reducing the impact between the magnetic bars. Since each magnetic bar is placed separately, employees can easily pick up or place the magnetic bars during operation, which greatly improves the safety and convenience of the operation and can reduce the contact wear between the magnetic bars.

[0037] Furthermore, by providing the storage channel 600 with multiple sections, the contact area between the magnetic rod and the inner wall of the storage channel 600 can be reduced to reduce the wear on the magnetic rod. Also, the elastic protective layer 200 configured on the inner wall of the storage channel 600 can not only protect the surface of the magnetic rod from scratches and extend the service life of the magnetic rod, but also reduce the friction noise when the magnetic rod is put in or taken out, thereby improving the comfort of the working environment. In addition, the use of elastic materials can also absorb part of the impact force generated by the mutual attraction of the magnetic rods, further protecting the magnetic rods and the placement rack from damage.

[0038] Exemplarily, the elastic protective layer 200 is a rubber layer covering the inner wall of the storage channel 600; of course, in other embodiments, the elastic protective layer 200 may also be a silicone layer, a cloth layer, a sponge layer, etc., which is not specifically limited here, as long as it can reduce wear.

[0039] Obviously, by providing a plurality of storage channels 600 on the frame 100 and arranging these channels at intervals, not only the orderly placement of the magnetic bars is achieved, but also the layout can be flexibly adjusted according to the magnetic bars of different sizes and usage requirements, thereby improving space utilization and usage efficiency.

[0040] In summary, the placement rack design of the present application successfully solves the problem of easy pinching and difficult separation of traditional magnetic rods through an innovative multi-segment short section structure, reasonable gap configuration and the application of an inner wall elastic protective layer 200, thereby improving the safety and convenience of operations. It is a practical and efficient innovation in the field of Chinese medicinal materials processing.

[0041] like Figure 2 As shown, in some embodiments, the storage channel 600 has an open end, and the open end is configured to be flared.

[0042] In these embodiments, the storage channel 600 is designed to have a flared opening at the upper end. This design feature brings additional advantages and convenience to the process of placing and removing the magnetic rod. The flared opening end can provide a larger entrance space for the magnetic rod, making it more convenient for the operator to place or remove the magnetic rod, and even a large or irregularly shaped magnetic rod can pass through relatively easily. This reduces potential damage to the magnetic rod or the placement rack and improves operating efficiency.

[0043] The flared design allows the contact area between the magnetic bar and the wall of the storage channel 600 to gradually decrease when the magnetic bar approaches the opening of the storage channel 600, thereby reducing friction, lowering the resistance of the magnetic bar when entering and exiting, protecting the surface of the magnetic bar from scratches, and extending the service life.

[0044] In addition, the flared design can also reduce the risk of the operator's fingers or other tools accidentally touching the edge of the channel when placing or removing the magnetic rod, reducing safety hazards and making the operation safer.

[0045] Of course, in other embodiments, in certain designs, the flared end may also be designed with a fixing or guiding structure, such as a groove or a buckle, to further stabilize the position of the magnetic bar and prevent the magnetic bar from shifting or falling due to accidental collision during operation.

[0046] Exemplarily, the opening end of the storage channel 600 is set to a bell mouth, that is, the storage channel 600 has a storage section and a flared section connected in sequence, the end of the flared section forms an open end, and the storage section and the magnetic rod are gap-matched.

[0047] like Figure 2 As shown, in some embodiments, the end of the storage channel 600 facing away from the opening end is the bottom end, and the bottom end is closed; wherein, when the storage rack is in use, the opening end of the storage channel 600 is arranged upward.

[0048] In this embodiment, the storage channel 600 is vertically arranged, and the upper end of the storage channel 600 is an open end, and the lower end of the storage channel 600 is a bottom end. The bottom end of the storage channel 600 is designed to be closed, which can prevent the magnetic bar or other objects from sliding out or falling from the bottom, ensuring that the magnetic bar is always kept in the storage channel 600 during the processing process, thereby improving safety.

[0049] When in use, the opening end of the storage channel 600 faces upwards, which makes it easy for the operator to visually observe the state of the magnetic bar and to place and remove the magnetic bar. The upward opening end is also conducive to gravity assistance. When the magnetic bar needs to be taken out, the operator only needs to lift it lightly, and the magnetic bar can slide down naturally under the action of gravity when it is placed.

[0050] In addition, the layout with the open end facing upward also facilitates the reasonable arrangement of the placement rack on the operating table or other limited space, because it does not require additional space to remove the magnetic rod from below. This design is more adaptable to various working environments and space limitations.

[0051] In addition, it is convenient to simultaneously transport the magnetic rods when the transport frame 100 is used.

[0052] like Figure 3 As shown, in some embodiments, the length of the storage channel 600 is L1, the length of the magnetic rod is L2, and they satisfy: L2>L1.

[0053] In these embodiments, the length L1 of the storage channel 600 is designed to be smaller than the length L2 of the magnetic rod or other related tools. Such a design takes the following aspects into consideration:

[0054] By setting L2>L1, the tool can only be stored partially embedded in the storage channel 600, rather than completely immersed. The exposed part of the tool (L2-L1) can be used as a simple grip point, so that the operator can quickly grab the tool without going deep into the channel, which improves work efficiency, especially in an operating environment where tools are changed urgently or frequently.

[0055] In addition, the non-embedded part of the tool is suspended in the air, which reduces the contact and friction with the inner wall of the storage channel 600, helps to reduce the wear of the tool and the storage channel 600, and prolongs the service life of both. This is particularly important for fragile or delicate tools.

[0056] Among them, although L2>L1, this design does not strictly limit the type or size of the tool. As long as the length of the tool exceeds the storage channel 600, this design principle can be used to provide storage solutions for tools of various sizes, increasing the versatility and flexibility of the system.

[0057] like Figure 1 and Figure 2 As shown, in some embodiments, the frame 100 includes a plurality of support plates 110 and a bottom plate 120, and the support plates 110 and the bottom plate 120 are connected and arranged, and the plurality of support plates 110 and the bottom plate 120 are arranged at intervals in the extension direction of the storage channel 600; wherein the storage channel 600 passes through the support plates 110.

[0058] In these embodiments, the structural design of the frame 100 adopts a combination of multiple support plates 110 and a bottom plate 120 to achieve stable support for the storage channel 600 and optimize the spatial layout.

[0059] A stable frame structure is formed by connecting a plurality of support plates 110 and a bottom plate 120. The support plates 110 and the bottom plate 120 are spaced apart in the extension direction of the storage channel 600, which means that the storage channel 600 can be designed between the support plates 110 as needed, which can not only meet the storage requirements of magnetic bars of different lengths or quantities, but also facilitate the adjustment of the spacing of the storage channels 600 to accommodate tools of different sizes, thereby improving the versatility and flexibility of the storage rack.

[0060] This design not only ensures the discontinuity of the storage channel 600, but also reduces the contact area between the inner wall of the storage channel 600 and the magnetic bar, thereby reducing the wear on the magnetic bar. At the same time, it also facilitates the cleaning and maintenance of the interior of the storage channel 600.

[0061] In addition, this modular design simplifies the assembly and maintenance of the rack 100. If a part is damaged, the corresponding support plate 110 or bottom plate 120 can be replaced separately without replacing the entire placement rack, which reduces maintenance costs and complexity.

[0062] For example, four corners of the bottom plate 120 are respectively installed with columns, and a plurality of support plates 110 are respectively fixed on the columns. For example, the bottom plate 120 and the support plates 110 are both welded and fixed to the columns; of course, they can also be fixed in other ways, such as bolt connection.

[0063] like Figure 4 As shown, in some embodiments, the frame 100 also includes an elastic protective cover, the storage channel 600 passes through the support plate 110 and a through opening 300 is formed on the support plate 110, the elastic protective cover is detachably connected to the support plate 110, and the elastic protective cover is inserted into the through opening 300.

[0064] In these embodiments, the elastic protective sleeve is passed through the through opening 300 of the storage channel 600 and directly wrapped around the edge of the storage channel 600, which can effectively prevent the magnetic rod or other tools from directly rubbing against the hard support plate 110 when inserted or removed, reduce scratches and damage, protect the integrity of the magnetic rod surface, and extend the service life.

[0065] For example, the elastic protective cover is generally made of rubber or other soft materials, and has a soft feel. The operator feels more comfortable when touching the protective cover, which reduces the discomfort caused by long-term operation and improves work efficiency and operating experience.

[0066] The elastic protective cover is fixed to the support plate 110 in a detachable connection manner, which means that when the protective cover is worn or needs to be cleaned, it can be easily removed for replacement or cleaning to maintain its good protective performance and sanitary condition, while also facilitating maintenance and replacement.

[0067] For example, the elastic protective cover has a slot that engages the edge of the through hole 300 to facilitate assembly and disassembly. Of course, in other embodiments, the elastic protective cover can also be configured to be connected to the support plate 110 by screws, etc., which is not specifically limited here.

[0068] In addition, it can adapt to magnetic bars of different diameters: Due to the elasticity and deformability of the elastic protective cover, it can adapt to magnetic bars of different diameters within a certain range, increasing the versatility and flexibility of the placement rack, so that the same placement rack can be used for magnetic bars or other tools of various specifications. In addition, when the magnetic bar enters and exits the storage channel 600, the elastic protective cover can buffer the direct collision between metals, significantly reduce the noise generated during the operation, and create a quieter working environment.

[0069] like Figure 2 As shown, in some embodiments, an elastic pad 500 is disposed on a side of the bottom plate 120 facing the support plate 110 .

[0070] In this embodiment, the elastic pad 500 has an airway buffering effect, thereby reducing the impact damage of the magnetic bar on the support plate 110 and reducing noise.

[0071] Exemplarily, the elastic pad 500 is a rubber pad, and the rubber pad covers the bottom plate 120. Of course, it can also only cover the part where the bottom plate 120 and the magnetic bar contact.

[0072] like Figure 2 As shown, in some embodiments, a gasket 400 is detachably connected to a side of the support plate 110 facing away from the bottom plate 120 , and the elastic pad 500 and the bottom plate 120 are detachably connected.

[0073] In this embodiment, the user can adjust the overall height of the rack by adding, removing or replacing gaskets 400 of different thicknesses according to actual needs to adapt to different work surface heights or meet specific operating requirements, thereby improving the versatility and customization capabilities of the rack.

[0074] The detachable connection design between the elastic pad 500 and the bottom plate 120 allows the user to easily replace the elastic pad 500 when it is worn or aged, without having to overhaul the entire rack, thereby reducing maintenance costs and complexity. Similarly, the detachability of the gasket 400 also facilitates cleaning or replacement, keeping the rack clean and at optimal performance.

[0075] Exemplarily, the gasket 400 is magnetically attracted to the support plate 110, and the elastic gasket 500 is magnetically attracted to the bottom plate 120; or, in other embodiments, the gasket 400 is fixed to the support plate 110 by screws, and the elastic gasket 500 is fixed to the bottom plate 120 by screws.

[0076] In some embodiments, the bottom end of the storage channel 600 can magnetically attract a magnetic rod.

[0077] In these embodiments, the bottom end of the storage channel 600 is designed with a magnetic adsorption function, which is directly used to fix the magnetic rod. The magnetic adsorption function at the bottom end of the storage channel 600 can directly attract and fix the magnetic rod, and even in the absence of other physical constraints (such as the support plate 110, buckles, etc.), it can ensure that the magnetic rod is stable in the storage channel 600 and does not fall off, which is particularly suitable for mobile or bumpy working environments, and increases the reliability of use.

[0078] In addition, through the method of magnetic adsorption at the bottom, the dependence on other fixing devices may be reduced, making the overall structure simpler, reducing manufacturing costs and maintenance complexity. At the same time, such a design also simplifies the placement operation of the magnetic bar. The user only needs to bring the magnetic bar close to the bottom of the storage channel 600 to automatically adsorb it into place. Moreover, the magnetic adsorption function makes the process of removing and placing the magnetic bar more convenient. The operator does not need to fix or unlock any locks with effort, which reduces the operation time and improves work efficiency. This is especially important for application scenarios where the magnetic bar is frequently replaced.

[0079] Magnetic adsorption can effectively prevent the magnetic bar from accidentally falling off during use, especially when the stand is tilted or flipped, the magnetic bar can still remain in place, reducing potential safety hazards in the workplace.

[0080] For example, the bottom is formed by a bottom plate 120, and the bottom plate 120 is made of a magnetic material. Alternatively, a magnetic attraction sheet is added to the bottom plate 120, which can also achieve the effect of magnetic attraction of the magnetic rod.

[0081] In some embodiments, the distance L3 between adjacent storage channels 600 satisfies: L3 ≥ 5 cm.

[0082] In these embodiments, maintaining a sufficient distance between the storage channels 600 (L3≥5cm) can effectively avoid unnecessary magnetic interference between adjacent magnetic bars due to the close distance, and ensure that each magnetic bar is easy to take and put.

[0083] Obviously, the larger spacing distance provides enough space for the operator to easily take and place the magnetic rod, reducing the risk of fingers being caught by the magnetic rod during operation and improving the safety of the operation. At the same time, such a design is also convenient for cleaning and maintenance, ensuring the hygienic state of the storage channel 600 and the magnetic rod.

[0084] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0085] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0086] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A storage rack, characterized in that: The placement rack comprises: The frame body has a plurality of storage channels, the storage channels can accommodate magnetic rods, and the plurality of storage channels are arranged at intervals; wherein the storage channels are divided into a plurality of short sections in the extension direction thereof, there are gaps between adjacent short sections, and the inner wall of the storage channels is provided with an elastic protective layer.

2. The placement rack according to claim 1, characterized in that: The storage channel has an open end, and the open end is configured to be in a flared shape.

3. The placement rack according to claim 2, characterized in that: The end of the storage channel away from the open end is the bottom end, and the bottom end is closed; wherein, when the placement rack is in use, the open end of the storage channel is arranged upward.

4. The placement rack according to claim 3, characterized in that: The length of the storage channel is L1, the length of the magnetic rod is L2, and they satisfy: L2>L1.

5. The placement rack according to claim 1, characterized in that: The frame comprises: A plurality of support plates and a bottom plate are provided, wherein the support plates and the bottom plate are connected to each other and are spaced apart in the extension direction of the storage channel; wherein the storage channel passes through the support plates.

6. The placement rack according to claim 5, characterized in that: The frame also includes: The elastic protective sleeve, the storage channel passes through the support plate and forms a through opening on the support plate, the elastic protective sleeve is detachably connected to the support plate, and the elastic protective sleeve is inserted into the through opening.

7. The placement rack according to claim 5, characterized in that: An elastic pad is arranged on one side of the bottom plate facing the supporting plate.

8. The placement rack according to claim 7, characterized in that: A gasket is detachably connected to one side of the support plate facing away from the bottom plate, and the elastic pad is detachably connected to the bottom plate.

9. The placement rack according to claim 3, characterized in that: The bottom end of the storage channel can magnetically absorb the magnetic rod.

10. The placement rack according to claim 1, characterized in that: The distance between adjacent storage channels is L3, satisfying: L3≥5cm.