Composite tenon, wooden component connecting method and wooden assembly

A connection method and wood technology, applied in the direction of connecting components, furniture connections, threaded fasteners, etc., can solve the problems of loose connection, poor ductility, and high brittleness of tenon and tenon joints, and achieve the effect of increasing depth and improving ductility.

Pending Publication Date: 2022-01-18
YANGZHOU POLYTECHNIC INST
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AI-Extracted Technical Summary

Problems solved by technology

This connection method can ensure the continuity of skeleton materials in two directions. It is a simple and efficient cross-connection method, but the wooden tenon and ...
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Method used

According to the composite tenon 100 of the embodiment of the present invention, one or more of the processed substrates are soaked by heat-fixing resin and thermoplastic resin, so that one or more composite layers composed of processed substrates pass through The heat-set resin and thermoplastic resin are bonded to enhance the bond strength between the processed substrates. Thus, the connection strength of the composite tenon 100 is improved.
Due to the influence of factors such as moisture, termites, worms, twists, and cracks in ancient buildings, the mortise and tenon joints of wooden components 4 (with mortise and tenon holes) are rotten and aging in various degrees, and then lead to joints The bearing capacity is reduced to varying degrees. But when adopting wooden base mortise and tenon blank 1 to reinforce, ancient buildings need the length of the mortise body required by mortise and tenon joints (the thickness of the wooden member 4 of ancient building is high), when wooden base tenon blank 1 is screwed into the reinforcement node, the wooden base Mortise and tenon blank 1 is very brittle due to its material characteristics, and it is easy to break when it is screwed into the tenon and tenon hole. The connection method of wooden components in the embodiment of the present invention, by reinforcing the composite tenon 100, can reduce the problem that the wooden base tenon blank 1 is prone to breakage during the reinforcement process of ancient buildings; penetration depth (up to 80cm). Moreover, the connection method using the wooden components in the embodiment of the present invention has the advantages of simple construction and can be applied to the wooden components 4 in thicker ancient buildings, for example, the wooden columns of large palaces.
The composite tenon 100 according to the embodiment of the present invention is compounded by the wood-based tenon blank 1 and the metal rod 2, which improves the ductility of the composite tenon 100 and reduces the wood-based tenon blank 1 in the process of embedding the preset hole 11. Because of its high brittleness, it is easy to break, and further, the depth of the mortise joint o...
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Abstract

The invention provides a composite tenon, a wooden component connecting method and a wooden assembly. The composite tenon comprises a wood-based tenon blank and a metal rod, wherein the wood-based tenon blank is provided with a preset hole extending in a direction perpendicular to a cross section of the wood-based tenon blank, at least one part of the metal rod is arranged in the preset hole, and the preset hole is in interference fit or threaded connection with the metal rod. The composite tenon effectively combines two excellent characteristics of high connection rigidity and desirable connection toughness of a beech tenon, and effectively avoids phenomena of high brittleness during connection of the composite tenon and extrusion and slippage of the metal rod during earlier-stage connection and stress; and therefore, the wooden assembly using the composite tenon as a connecting piece for reinforcing has advantages of being stable in connection and simple in structure.

Application Domain

ScrewsBuilding constructions +1

Technology Topic

EngineeringInterference fit

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  • Composite tenon, wooden component connecting method and wooden assembly
  • Composite tenon, wooden component connecting method and wooden assembly
  • Composite tenon, wooden component connecting method and wooden assembly

Examples

  • Experimental program(1)

Example Embodiment

[0040] The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.
[0041] like Figure 1 to Figure 9 As shown, the embodiment of the present invention provides a composite tenon 100 and a method for connecting wooden components connected by the composite tenon 100 .
[0042] Wherein, the composite tenon 100 of the embodiment of the present invention includes a wood-based tenon blank 1 and a metal rod 2 . The wooden-based tenon blank 1 has a preset hole 11 extending in a direction perpendicular to the cross-section of the wood-based tenon blank 1 , and the metal rod 2 At least a part is set in the preset hole 11 , and the preset hole 11 is connected with the metal rod 2 by interference fit or screw connection.
[0043] The composite tenon 100 according to the embodiment of the present invention is compounded by the wood-based tenon blank 1 and the metal rod 2 , which improves the ductility of the composite tenon 100 and reduces the inherent brittleness of the wood-based tenon blank 1 during the process of embedding the wood-based tenon blank 1 into the preset hole 11 . The problem of fracture easily occurs, and further, the depth of the mortise joint of the composite tenon 100 is increased. In the composite tenon 100 of the embodiment of the present invention, at least a part of the metal rod 2 is disposed in the preset hole 11 so that the metal rod 2 is firstly combined with the wood-based tenon blank 1. When in use, the wood-based tenon blank 1 of the composite tenon 100 is connected to Or the reinforced wooden member 4 is in contact, so as to avoid the problem of loosening of all the connecting parts of the metal rod 2 in direct contact with the wooden member 4 to be connected.
[0044] Therefore, using the composite tenon 100 in the embodiment of the present invention as the connecting piece has the advantages of a large depth of the mortise joint, stable connection and convenient operation.
[0045] like Figure 1 to Figure 3 As shown, any one of the wood-based tenon blank 1 and the metal rod 2 is cylindrical, the diameter and length of the wooden-based tenon blank 1 are respectively 4mm-20mm and 20mm-50mm, and the diameter of the metal rod 2 is the wood-based tenon blank 1 . 0.2 times-0.6 times the diameter of the metal rod 2, and the length of the metal rod 2 is at least 0.3 times the length of the wood base tenon blank 1. In other words, the length of the metal rod 2 can be equal to the length of the wood-based tenon blank 1, such as figure 1 shown; the length of the metal rod 2 is greater than the length of the wood base tenon blank 1, such as figure 2 shown; the length of the metal rod 2 is equal to 0.6-0.8 times the length of the wood base tenon blank 1, such as image 3 shown. The beech wood material used in the embodiment of the present invention is relatively hard, has good stability, has many no-knot areas, and has small defects, which is beneficial to the bearing stability of the connecting nodes, and will not cause the failure of the connecting nodes due to the defects of the wood tenon itself. .
[0046] Optionally, the choice of wood tenon: the wood tenon is preferably selected from hardwood without joints and defects, and it is recommended to use the jointless beech tenon; the diameter of the tenon is 8mm-20mm, and the length is the beam width minus 20mm-30mm; The moisture content is adjusted to 2%; the beech wood tenon blank can be dipped in 0.1mol/L copper chloride, hydrochloric acid and other solutions for 30min.
[0047] For example, a beech wood tenon blank has a diameter of 12 mm and a length of 70 mm, and the metal rod 2 has a diameter of 5.2 mm and a length of 50 mm. The diameter of the beech wood tenon blank 1 is 12mm and the length is 100mm, and the diameter of the metal rod 2 is 6mm and the length of 120mm. The two sizes are mainly used for the connection and reinforcement of the beam-column tenon-mortise structure with a cross-section of 120*120mm or 140*140mm;
[0048]The diameter of the beech tenon blank 1 is 10mm and the length is 70mm, and the diameter of the metal rod 2 is 5.2mm and the length of 70mm; it is mainly used for the connection and reinforcement of the beam-column tenon-mortise structure with a cross-section of 90*90mm.
[0049] The diameter of the beech tenon blank 1 is 6mm and the length is 40mm, and the diameter of the metal rod 2 is 3.2mm and the length of 60mm; it is mainly used for the connection of the wood frame wall cladding panel and the skeleton.
[0050] In addition to beech tenon blanks, wood-based tenon blanks can also use pineapple lattice, engineered wood (including veneer slat laminated timber, reconstituted bamboo, etc.).
[0051] Specifically, the preparation method of the wood-based tenon blank 1 comprises the following steps:
[0052] Rough machining of raw sawn timber or machining residues to obtain machined substrates;
[0053] Cutting the processed base material to obtain a plurality of wood-based tenon blanks 1;
[0054] The tenon body of the wood-based tenon blank 1 is ground or cut, so as to obtain the wood-based tenon blank 1 with a predetermined cross-section.
[0055] Optionally, the wood-based tenon blank 1 is a beech wood tenon blank. The beech tenon blank has high connection rigidity. The composite tenon obtained by the connection and combination of the beech tenon blank and the metal rod has the characteristics of good toughness and high rigidity, which effectively avoids the brittle and rapid damage of the beech tenon connection and the early stress of the metal rod connection. Squeeze slip phenomenon.
[0056] Optionally, the diameter of the rod body 21 is 1mm-10mm larger than the diameter of the wood-based tenon blank 1 .
[0057] Optionally, the moisture content of the composite tenon 100 is less than or equal to 2%.
[0058] According to the composite tenon 100 of the embodiment of the present invention, the moisture content of the dried composite tenon 100 is controlled to be less than 2%, which can enhance the deformation resistance of the composite tenon 100 .
[0059] like Figure 1 to Figure 3 As shown, the metal rod 2 includes a rod body 21 and a rod cap 22 connected to each other, the outer peripheral wall of the rod body 21 is threaded, and the rod body 21 penetrates the preset hole 11 . For example, the metal rod 2 is a screw or screw.
[0060] The composite tenon 100 according to the embodiment of the present invention can make the structure of the rod body 21 and the wooden tenon blank 1 more fastened by the threads on the outer peripheral wall of the metal rod 2, and the problem of slippage is less likely to occur.
[0061] Optionally, the length of the metal rod 2 is greater than the length of the wood-based tenon blank 1, such as figure 2 shown. Specifically, the length of the rod body 21 is at least 20 mm greater than the length of the wood-based tenon blank 1 . In other words, when the composite tenon 100 is used for the connecting piece, the rod body 21 is directly connected to the wood base tenon blank 1 and the wooden member 4, which further increases the thickness of the connectable wood pieces and improves the applicability of the composite tenon 100. At the same time, the stability of the connection is improved.
[0062] Optionally, one end of the rod cap 22 away from the rod body 21 is provided with a character groove, a cross groove, a plum blossom groove, a rice character groove or a star groove. It is convenient to screw the metal rod 2 into the wooden structure.
[0063] Optionally, one end of the metal rod 2 has a nail tip, and the angle of the nail tip is 30°-40°.
[0064] like Figure 1 to Figure 3 As shown, the projection of the wood-based tenon blank 1 along the axial direction of the composite tenon is within the projection of the brim of the rod cap 22 along the axial direction of the composite tenon. It can be understood that the cross-sectional area of ​​the brim of the rod cap 22 is larger than the cross-sectional area of ​​the wood-based tenon blank 1 . The pull-out resistance of the composite tenon 100 as a connector is improved.
[0065] The wood-based tenon blank includes a main body and an acid-impregnated layer provided on the outer wall surface of the main body. The acid-impregnated layer is formed by soaking the wood-based tenon blank 1 in an acid solution. Specifically, the processed substrate is immersed in an acidic solution with a concentration of 0.1 mol/L for 10 to 30 minutes, then dried, sawed and polished to obtain a wood-based tenon blank 1 with an acid-impregnated layer.
[0066] The composite tenon 100 according to the embodiment of the present invention hydrolyzes the substances in the processing base material through the acid impregnating layer, fully softens the fibers in the wood member 4, destroys the fiber cell walls, and exposes the glued substances therein. Thus, the stability of the connection or reinforcement of the composite tenon 100 and the wood assembly 200 is improved.
[0067] Optionally, the processed substrate includes a substrate body and a resin-impregnated layer on the outer wall surface of the substrate body. The resin impregnated layer is obtained by impregnating the processed substrate with at least one of a thermosetting resin and a thermoplastic resin, and the impregnation is carried out for 10 minutes to 30 minutes; To form a composite board, optionally, the thickness of the composite board is 4mm-10mm, and the density of the composite board is 1100Kg/m 3 -1300Kg/m 3.
[0068] Wherein, the heat-setting resin is one of phenolic resin, isocyanate, epoxy resin and bismaleimide resin, and the thermoplastic resin is one of polyvinyl chloride, polyethylene, polypropylene and polystyrene.
[0069] According to the composite tenon 100 of the embodiment of the present invention, one or more of the processed substrates are soaked by the heat-fixing resin and the thermoplastic resin, so that the heat-fixing resin is passed between the composite layers composed of the one or more processed substrates. Bonding with thermoplastic resins, thereby enhancing the bonding strength between processed substrates. Further, the connection strength of the composite tenon 100 is improved.
[0070] Among them, the thickness of the composite board is 4mm-10mm, and the density of the composite board is 1100Kg/m 3 -1300Kg/m 3. When the density of the composite board 1 is lower than 1100Kg/m 3 , the overall strength of the composite board decreases, when the density of the composite board is greater than 1300Kg/m 3 , the cost of manufacturing the composite board increases, that is, more processing substrates need to be used in the same volume, and a large amount of resources are also required to manufacture corresponding processing substrates, thereby causing waste of resources. Optional, the density of the composite board is 1200Kg/m 3 , its hardness and cost can be balanced.
[0071] Embodiments of the present invention also provide a method for connecting wooden components, comprising the following steps:
[0072] A) A connecting hole 41 is provided on the wooden member 4, and the connecting holes 41 of the N wooden members 4 stacked together are arranged oppositely;
[0073] B) Screw any one of the above-mentioned composite tenons 100 into the connecting holes 41 , and the composite tenons 100 pass through at least the connecting holes 41 of N−1 wooden components 4 . It can be understood that, the connecting holes 41 can be opened one by one in the wooden members 4, and the punched wooden members 4 are stacked together and the connecting holes 41 are arranged oppositely; , the composite tenon 100 passes through at least the connecting holes 41 of the N-1 wooden components 4 . It is also possible to stack the N wooden components 4 together to open the connecting holes 41, and then screw any of the above-mentioned composite tenons 100 into the connecting holes 41, and the composite tenons 100 pass through at least the connecting holes of the N-1 wooden components 4. within 41. Specifically, refer to Figure 4-Figure 8 The reinforcement status shown in .
[0074] The composite tenon 100 according to the embodiment of the present invention is compounded by the wood-based tenon blank 1 and the metal rod 2 , so that the ductility of the composite tenon 100 is improved, and the mortising depth of the composite tenon 100 is improved. In the composite tenon 100 of the embodiment of the present invention, at least a part of the metal rod 2 is arranged in the preset hole 11 so that the metal rod 2 is firstly combined with the wood-based tenon blank 1, so as to avoid all the connection parts of the metal rod 2 and the wooden member 4 to be connected. There is a problem of looseness in direct contact.
[0075] According to the method for connecting wooden components according to the embodiment of the present invention, the composite tenon 100 is screwed into the connection hole 41 by screwing in. During the rotation, the cellulose, Structural layers such as lignin and the fiber layer in the wood component 4 will form a glue layer during the rotation of the wood-based tenon blank 1 , which realizes reinforcement without glue injection. That is, under the premise that the connection method of the wood components does not require glue injection, and the bearing capacity of the obtained wood assembly 200 reaches the wood assembly 200 reinforced by the glue injection method, the connection method of the wood components according to the embodiment of the present invention has a good reinforcement effect. The advantages of low reinforcement cost and no need for glue injection.
[0076] Therefore, the connection method of the wooden components of the embodiment of the present invention has the advantages of large depth of socket connection, good reinforcement effect, simple construction, economical environmental protection, and easy promotion, and is suitable for special wooden components 4 that are not suitable for reinforcement by glue injection.
[0077] In some embodiments, connecting holes 41 are opened on the at least two connected wooden components 4 , and the composite tenon 100 is screwed into the connecting holes 41 (the control speed is 800-2000 rpm). For example, as Figure 5 to Figure 8 As shown in the figure, the number of wooden boards is three, and the three wooden boards are arranged in order in the up and down direction (the up and down directions are as follows: Figure 7 Arrow B in the middle), from top to bottom are the first plate to be strengthened, the second plate to be strengthened and the third plate to be strengthened, the connecting holes 41 on the first plate to be strengthened and the second plate to be strengthened are through The connecting holes 41 on the third plate to be reinforced may not penetrate the thickness of the third plate to be reinforced. The total length of the connecting holes 41 on the three boards to be reinforced should be the same as the length of the wood-based tenon blank 1 (the length direction is as follows: Figure 7 shown by arrow B in ).
[0078] Optionally, the number of wooden boards may also be two.
[0079] Optionally, the wood member 4 may be one or more of laminated wood boards, original wood boards, wooden sticks and wooden posts. In other words, the wood component 4 may be a laminated wood board and a raw wood board to be connected by the composite tenon 100 ; it may also be a wood column, a pressed wood board and a raw wood board to be connected by the composite tenon 100 .
[0080] Optionally, the wooden component 4 is the wooden component 4 of an ancient building.
[0081] A method for reinforcing a wooden component of an ancient building disclosed in an embodiment of the present invention includes the following steps:
[0082] Remove the rotten tenon and tenon from the wooden beam, clean the dust, oil and other impurities on the sticking surface of the wooden beam and polish it with coarse sandpaper. The composite tenon 100 that matches the size of the hole), use the double-joint holding member 3 to hold one end of the metal rod 2, and use an electric drill to hold the double-joint holding member 3 and rotate until all the wood-based tenon blanks 1 are screwed into the holes of the tenon-and-mortise joint. Then, directly screw the part of the metal rod 2 exposed on the outside of the wooden member 4 into the wood base tenon blank 1 until the metal rod 2 is flush with the outer wall of the wooden member 4 .
[0083] According to the method for connecting wooden components in the embodiment of the present invention, the bearing capacity of the reinforced ancient wooden beam reaches or even exceeds that of the log, and has the advantages of good reinforcement effect, low repair cost, and easy popularization and use.
[0084] Due to the influence of factors such as moisture, termites, moth-eaten, twisting, cracking and other factors in ancient buildings, the tenon-and-mortise joints (here with tenon-and-mortise holes) of the wooden components 4 are decayed and aged to varying degrees, which in turn leads to the appearance of joint bearing capacity. reduced to varying degrees. However, when the wood base tenon blank 1 is used for reinforcement, the length of the tenon body required by the tenon and mortise joint is required for ancient buildings (the thickness of the wooden component 4 of the ancient building is high). When the wood base tenon blank 1 is screwed into the reinforcing node, the Due to its own material characteristics, the tenon blank 1 is very brittle and easily breaks during the process of screwing into the tenon-and-mortise hole. In the method for connecting wooden components in the embodiment of the present invention, by reinforcing the composite tenon 100, the problem that the wooden tenon blank 1 is easily broken during the reinforcing process of the ancient building can be reduced; Penetration depth (up to 80cm). Moreover, the connection method of the wooden components in the embodiment of the present invention has the advantages of simple construction and can be applied to the wooden components 4 in ancient buildings with large thickness, for example, the wooden columns of large palaces.
[0085] At the same time, it is also avoided that when the metal rod 2 is used for reinforcement, the coefficient of thermal expansion and contraction of the metal rod 2 is greater than the coefficient of thermal expansion and contraction of the wooden member 4. Because ancient buildings are generally exposed to the sun and damp for a long time, it is easy to cause the reinforcement joints. The wooden component 4 is cracked and twisted, causing secondary damage to the wooden component 4 itself. In addition, the connection method of the wooden components of the embodiment of the present invention does not require glue injection during the reinforcement process of the wooden components 4 of the ancient building, retains the wooden structure of the ancient building, and avoids the need for glue injection during reinforcement. The problem of causing damage to the wood piece itself.
[0086] The wood base tenon blank 1 is a beech wood tenon blank. For example, the diameter of the beech tenon blank is 12 mm and the length of 70 mm, and the diameter of the metal rod 2 is 5.2 mm and the length of 50 mm. The composite tenon 100 single shear test of beech tenon, self-tapping screw and beech wood component 4; the results show that the single shear maximum force of the test piece connected by the composite tenon 100 in the connection method of the wood component of the embodiment of the present invention is higher than that of using beech wood alone. Tenon and self-tapping screws are 30.56% and 65.59% higher, yield load is 6.97% and 62.42% higher, ultimate load is 29.76% and 60.95% higher, initial stiffness is 24.04% and 371.54% higher, and ductility coefficient is 167.5% and 100.63 higher, respectively %, the energy consumption is 345.49% and 26.88% higher, respectively.
[0087] The test results show that the wood components 4 connected by the composite tenon 100 made of beech tenon blanks obviously have two maximum peaks of ultimate load, which effectively combine the two excellent characteristics of high stiffness of beech tenon connection and good toughness of self-tapping screw connection. , effectively avoiding the brittle and rapid damage of the beech tenon connection and the extrusion-slip phenomenon in the early stage of the self-tapping screw connection.
[0088] Beech tenon (diameter 10mm, length 140mm, three metal rods, each metal rod diameter 8mm, length 240mm), threaded rod (metal rod diameter 8mm, length 240mm)) + glue injection and beech wood billet (diameter 10mm, length 140mm) ), carry out a single shear test, the results show that the maximum single shear force of the test piece connected by the composite tenon 100 is 10.7 ± 0.5kN, and the maximum force of the threaded rod + glue injection single shear reaches 7.5 ± 0.8 kN; the maximum single shear force of the beech billet is 3.3±0.2kN.
[0089] In some embodiments, the cross-sectional area of ​​the connecting hole 41 is 1 mm-10 mm smaller than the cross-sectional area of ​​the wood-based tenon blank 1 . In the process of rotating the composite tenon 100, the cellulose, hemicellulose and lignin in the composite tenon 100 and the cellulose, hemicellulose and lignin on the wood member 4 to be connected form more It is a compact structure, thereby improving the tightness of the connection.
[0090] In some embodiments, in step B), a screw member is used to hold one end of the metal rod 2, all the wooden tenon blanks 1 are screwed into the connecting hole 41, the screw member is removed, and the metal rod 2 is exposed on the wooden base A part outside the tenon blank 1 is screwed into the wood base tenon blank 1 . One end of the metal rod 2 is supported by the screwing member, so as to avoid directly supporting the wood-based tenon blank 1. There will be a problem that the composite tenon 100 cannot be rotated after being screwed to the holding position, thereby causing a part of the wood-based tenon blank 1 (blessing). The part of the wood-based tenon blank 1 supported by the external part is exposed on the outside of the wooden component, reducing the effective contact area between the composite tenon 100 and the wooden component, thereby affecting the effect of reinforcement. At the same time, the wood-based tenon blank 1 exposed on the outside of the wooden component affects the overall appearance.
[0091] In some embodiments, the screwing member includes an electric drill and a double-piece supporting member 3 arranged on the drill bit of the electric drill. The double-joint supporting member 3 is used to support one end of the metal rod 2 and screw the electric drill.
[0092] like Figure 5 to Figure 6 As shown, the double-strength holding member 3 includes two symmetrically arranged first holding portions 31 and second holding portions 32. The first holding portion 31 is provided with an axially extending first accommodating groove 33 of the metal rod 2. The holding part 32 is provided with an axially extending second receiving groove 34 of the metal rod 2 . The first receiving groove 33 and the second receiving groove 34 form a receiving hole for holding one end of the metal rod 2 .
[0093] Optionally, the chuck is an electric drill chuck.
[0094] Specifically, the accommodating hole is a stepped hole, the first accommodating groove 33 and the second accommodating groove 34, the radius of the first accommodating groove 33 is 6mm-8mm, the length is 3mm-8mm, and the radius of the second accommodating groove 34 is 1.5mm-2.5mm , the length is 20mm-30mm, the first accommodating groove 33 is located in the middle of the double-spliced ​​holding member 3, the first accommodating groove 33 is connected with the second accommodating groove 34, and the first accommodating groove 33 is used for placing and fixing the nail cap of the metal rod 2, The second accommodating groove 34 is used for placing and fixing the main body of the metal rod 2 . Each of the first accommodating groove and the second accommodating groove is semicircular along the axial direction of the double-piece holding member. Facilitates disassembly and reuse of the holder.
[0095] Optionally, the length of the double-spliced ​​support member 3 is 30mm-50mm.
[0096] like Figure 8 to Figure 9 The present invention also provides a wood assembly 200, comprising a composite tenon 100 and N wood members 4, the composite tenon 100 is any one of the above-mentioned composite tenons 100, and each wood member 4 has a connecting hole 41, the composite tenon 100 is The tenon 100 penetrates at least N-1 connecting holes 41 of the wooden components 4, and N≥2.
[0097] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated devices or elements. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.
[0098] In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.
[0099] In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between the two components, unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0100] In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
[0101] In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean a specific feature, structure, material, or description described in connection with the embodiment or example. Features are included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.
[0102] Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

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Length4.0 ~ 50.0mm

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