Assembled and combined type frame box

Abstract

The utility model relates to the technical field of packaging, in particular to an assembled combined type frame box which comprises a horizontal rod, a vertical rod and an inclined rod, and a corner inserting mechanism and a face inserting mechanism are arranged at the connecting positions of the horizontal rod, the vertical rod and the inclined rod respectively. The corner inserting mechanisms and the face inserting mechanisms are arranged at the four corners and the eight edges of the frame box respectively and used for limiting the positions of the horizontal rods, the vertical rods and the inclined rods and reliably fixing the horizontal rods, the vertical rods and the inclined rods. According to the assembled combined type frame box, combination is achieved in a clamping mode, and the fixing reliability is improved by combining the structure of the frame box.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging, in particular to an assembled combined frame box. Background Art

[0002] Rack boxes usually refer to a box supported by a solid frame structure, which is often used for transportation, storage or equipment protection. Rack boxes have a solid frame and can carry a large weight or provide better protection for items in the box. Depending on different application scenarios, rack boxes have a variety of different materials and designs, such as wood, metal, and plastic, and designs such as adding diagonal bars and reinforcing ribs.

[0003] The frame box is assembled by assembling parts, which are clamped at the joints of the connecting rods of the frame box to increase the friction on the contact surface of each connecting rod and achieve a fixed connection between the connecting rods. It can be seen that conventional assembling parts still have the following shortcomings:

[0004] 1. Long-term clamping causes metal fatigue in the assembled parts, resulting in looseness;

[0005] 2. The connection method of the assembled parts has poor fixation reliability. Utility Model Content

[0006] In order to solve the technical problems existing in the background technology, the utility model provides an assembled combined frame box, which is assembled by means of a snap connection and combined with the structure of the frame box itself to improve the reliability of fixation.

[0007] The technical solution adopted by the utility model is:

[0008] An assembled frame box includes horizontal bars, vertical bars, and diagonal bars. The connections of the horizontal bars, vertical bars, and diagonal bars are respectively provided with corner insertion mechanisms and surface insertion mechanisms. The corner insertion mechanisms and surface insertion mechanisms are respectively provided at the four corners and eight sides of the frame box to limit the positions of the horizontal bars, vertical bars, and diagonal bars and to securely fix them.

[0009] Furthermore, the four corners of the frame box include:

[0010] Two mutually perpendicular horizontal poles, one vertical pole, and one to two diagonal poles;

[0011] The corner plugging mechanism is formed by a corner plugging outer component and a corner plugging inner component which are clamped together.

[0012] Furthermore, the corner plug outer component includes:

[0013] The outer angle plate in contact with the outer wall of the frame box is arranged in a "┗" shape and abuts against the outer end surfaces of the horizontal rod, the vertical rod and the diagonal rod. The inner plate surface of the outer angle plate is protrudingly provided with a diagonal rod corner plug lower support, and the upper top surface of the outer angle plate is vertically provided with a corner plug upper plate extending inwardly thereof. The corner plug upper plate is arranged horizontally, and a corner plug ear is protruding downwardly from the plate surface of the corner plug upper plate.

[0014] Furthermore, the corner insert inner component comprises:

[0015] The inner angle plate in contact with the outer wall of the frame box is arranged in a "┗" shape parallel to the outer angle plate, and abuts against the inner end faces of the horizontal rod, the vertical rod and the oblique rod. The outer plate surface of the inner angle plate is protrudingly provided with an oblique rod corner plug upper support, and the upper top surface of the outer angle plate is vertically provided with a corner plug lower plate extending outward thereof. The corner plug lower plate is horizontally arranged below the corner plug upper plate, and the plate surface of the corner plug lower plate is provided with a corner plug hole that is engaged with the corner plug ear.

[0016] Further, the diagonal rod angle plug lower support is set in a "Λ" shape, and two groups are symmetrically arranged, and are in contact with the vertical rod and the diagonal rod respectively; the diagonal rod angle plug upper support is set in a "7" shape, and two groups are symmetrically arranged, and are in contact with the horizontal rod and the diagonal rod respectively; the extension parts of the diagonal rod angle plug upper support and the diagonal rod angle plug lower support are inclined and parallel to the upper and lower sides of the diagonal rod;

[0017] A first protrusion is protruding from the inner plate surface of the outer angle plate, and the first protrusion is clamped in the "7"-shaped corner of the diagonal corner plug upper support. A second protrusion is protruding from the outer plate surface of the inner angle plate, and the second protrusion is clamped in the "Λ"-shaped corner of the diagonal corner plug lower support.

[0018] Furthermore, the eight sides of the frame box include:

[0019] One horizontal pole and one vertical pole or two diagonal poles;

[0020] The surface plug-in mechanism is composed of a surface plug-in outer component and a surface plug-in inner component that are snap-connected and assembled.

[0021] Furthermore, the surface plug-in external component includes:

[0022] A straight plate-shaped outer panel in contact with the outer wall of the frame box, the outer panel abuts against the outer end faces of the horizontal rods and the vertical rods or the oblique rods, a protruding oblique rod surface plug-in lower support is provided on the inner panel surface of the outer panel, a surface plug-in upper plate extending inwardly is vertically provided on the upper top surface of the outer panel, the surface plug-in upper plate is horizontally arranged, and a surface plug-in ear is protruding downward on the panel surface of the surface plug-in upper plate.

[0023] Furthermore, the surface-inserted inner component comprises:

[0024] An inner panel in contact with the outer wall of the frame box, the inner panel is arranged in a straight plate shape parallel to the outer panel, and abuts against the inner end faces of the horizontal rods and the vertical rods or the oblique rods, a protruding oblique rod surface plug-in upper support is arranged on the outer panel surface of the inner panel, a through groove is arranged through the panel surface of the inner panel, the through groove is used to pass the horizontal rod, a surface plug-in lower plate extending to the outside thereof is vertically arranged on the upper top surface of the inner panel, the surface plug-in lower plate is horizontally arranged below the surface plug-in upper plate, and a surface plug-in hole which is engaged with the surface plug-in ear is arranged on the panel surface of the surface plug-in lower plate.

[0025] Further, the inclined rod surface inserted lower support is set in a "Λ" shape, and two groups are symmetrically arranged, and are in contact with the vertical rod and the inclined rod respectively; the inclined rod surface inserted upper support is set in a "7" shape, and two groups are symmetrically arranged, and are in contact with the flat rod and the inclined rod respectively, and the extension parts of the inclined rod surface inserted upper support and the inclined rod surface inserted lower support are inclined and parallel to the upper and lower sides of the inclined rod; the through groove is set between the two symmetrical groups of inclined rod surface inserted lower supports;

[0026] A third protrusion is protrudingly provided on the inner surface of the straight plate-shaped outer panel, and the third protrusion is clamped in the "7"-shaped corner of the inclined rod surface inserted into the upper support. A fourth protrusion is protrudingly provided on the outer surface of the inner panel, and the fourth protrusion is clamped in the "Λ"-shaped corner of the inclined rod surface inserted into the lower support.

[0027] Furthermore, a corner plug chamfer is provided at the edge of the outer side surface of the corner plug lower plate to facilitate insertion between the corner plug upper plate and the flat rod.

[0028] The edge of the outer side surface of the surface insertion lower plate is provided with a surface insertion chamfer to facilitate insertion between the surface insertion upper plate and the flat rod.

[0029] The beneficial effects of the assembled combined frame box of the utility model are:

[0030] By means of snap connection, the corner plug-in outer component and the corner plug-in inner component are combined into a corner plug-in mechanism, and the surface plug-in outer component and the surface plug-in inner component are combined into a surface plug-in mechanism; the supporting part of the oblique rod cooperates with the connecting rods of the frame box to achieve reliable fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a general three-dimensional schematic diagram of an assembled combined frame box provided by an example of the utility model;

[0032] Figure 2 This is a three-dimensional schematic diagram of a corner plug-in outer component of an assembled modular frame box provided by an example of the utility model;

[0033] Figure 3 The utility model provides a three-dimensional schematic diagram of the corner plug inner parts of the assembled combined frame box. Figure 2 ;

[0034] Figure 4 This is a three-dimensional schematic diagram of the surface-inserted external components of an assembled combined frame box provided by the utility model example;

[0035] Figure 5 The utility model provides a three-dimensional schematic diagram of the surface-inserted inner parts of an assembled combined frame box.

[0036] In the figure:

[0037] 11. Horizontal pole, 12. Vertical pole, 13. Diagonal pole,

[0038] 2. Angle insertion mechanism,

[0039] 21. Corner plug external parts, 210. External corner plate, 871822

[0040] 211, the angle of the diagonal rod is inserted into the lower support, 212, the first protrusion, 213, the angle is inserted into the upper plate,

[0041] 214, corner plug-in ear,

[0042] 22, corner insert inner part, 220, inner corner plate, 221, diagonal rod corner insert upper support, 222, second protrusion, 223, corner insert lower plate,

[0043] 224, corner card hole, 225, corner plug chamfer,

[0044] 3. Surface insertion mechanism,

[0045] 31. Surface insert outer component, 310. External panel, 311. Surface insert lower support of inclined rod, 312. Third protrusion, 313. Surface insert upper plate, 314. Surface insert ear,

[0046] 32. Insert the inner part on the surface, 320. Insert the inner panel, 321. Insert the upper support on the inclined rod surface, 322. The fourth protrusion, 323. Insert the groove,

[0047] 324, the lower plate is inserted on the surface, 325, the card hole is inserted on the surface, 326, the chamfer is inserted on the surface. DETAILED DESCRIPTION

[0048] In order to more clearly and explicitly illustrate the specific implementation purpose and implementation method of the utility model, the technical solution of the utility model will be fully described below. The described embodiment is a part of the embodiment of the utility model, not all the embodiments. Without making creative work, all other embodiments based on the embodiment described in the utility model belong to the protection scope of the utility model.

[0049] The utility model discloses an assembled combined frame box, such as Figure 1As shown, it includes: a horizontal rod 11, a vertical rod 12, an oblique rod 13, and a frame bottom beam; the four corners of the frame box include: two mutually perpendicular horizontal rods 11, a vertical rod 12, and one to two oblique rods 13; the eight sides of the frame box include: a horizontal rod 11 and a vertical rod 12 or two oblique rods 13.

[0050] Corner inserting mechanisms 2 are provided at the four corners of the frame box. The corner inserting mechanisms 2 are composed of a corner inserting outer component 21 and a corner inserting inner component 22, which are used to define the positions of the horizontal rod 11, the vertical rod 12 and the diagonal rod 13 and to fix them reliably.

[0051] The corner plug outer member 21, such as Figure 2 As shown, including:

[0052] The outer angle plate 210 in contact with the outer wall of the frame box is arranged in a "┗" shape and abuts against the outer end faces of the horizontal rod 11, the vertical rod 12 and the diagonal rod 13. The inner plate surface of the outer angle plate 210 is protrudingly provided with a diagonal rod corner plug lower support 211 and a first protrusion 212. The diagonal rod corner plug lower support 211 is arranged in a "Λ" shape and is symmetrically arranged in two groups and respectively contacts the vertical rod 12 and the diagonal rod 13. The extension part of the diagonal rod corner plug lower support 211 is arranged obliquely and parallel to the lower side of the diagonal rod 13. The first protrusion 212 is clamped in the "7"-shaped corner of the diagonal rod corner plug upper support 221. A corner plug upper plate 213 extending toward the inner side is vertically arranged on the upper top surface of the outer angle plate 210. The corner plug upper plate 213 is arranged horizontally, and a corner plug ear 214 is protruding downward on the plate surface of the corner plug upper plate 213.

[0053] The corner insert inner part 22, such as Figure 3 As shown, including:

[0054] The inner angle plate 220 in contact with the outer wall of the frame box is arranged in a "┗" shape parallel to the outer angle plate 210, and abuts against the inner end faces of the horizontal rod 11, the vertical rod 12, and the oblique rod 13. The outer plate surface of the inner angle plate 220 is protrudingly provided with an oblique rod corner plug-in support 221 and a second protrusion 222. The oblique rod corner plug-in support 221 is arranged in a "7" shape, and two groups are symmetrically arranged, and are in contact with the horizontal rod 11 and the oblique rod 13 respectively. The extension of the oblique rod corner plug-in support 221 is arranged obliquely and parallel to the oblique rod. On the upper side of the rod 13, the second protrusion 222 is clamped in the "Λ"-shaped corner of the oblique rod corner plug lower support 211, and a corner plug lower plate 223 extending outward is vertically arranged on the upper top surface of the outer corner plate 210, and the corner plug lower plate 223 is horizontally arranged below the corner plug upper plate 213. A corner plug chamfer 225 is arranged at the edge of the outer side surface of the corner plug lower plate 223 to facilitate insertion between the corner plug upper plate 213 and the flat rod 11, and a corner plug hole 224 is arranged on the plate surface of the corner plug lower plate 223 to be clamped with the corner plug ear 214.

[0055] The eight sides of the frame box are provided with a surface insertion mechanism 3, which is composed of a surface insertion outer component 31 and a surface insertion inner component 32, and is used to limit the positions of the horizontal rod 11, the vertical rod 12, and the diagonal rod 13, and to fix them reliably.

[0056] The surface plug-in outer component 31, such as Figure 4 As shown, including:

[0057] A straight plate-shaped outer panel 310 in contact with the outer wall of the frame box, the outer panel 310 abuts against the outer end faces of the horizontal rod 11 and the vertical rod 12 or the diagonal rod 13, and a diagonal rod surface plug-in lower support 311 and a third protrusion 312 are protrudingly provided on the inner plate surface of the outer panel 310, the diagonal rod surface plug-in lower support 311 is arranged as an "Λ"-shaped inclined section and a vertical section, and two groups are symmetrically arranged, and are respectively in contact with the vertical rod 12 and the diagonal rod 13, the extension part of the diagonal rod surface plug-in lower support 311 is arranged obliquely and parallel to the lower side of the diagonal rod 13, the third protrusion 312 is clamped in the "7"-shaped corner of the diagonal rod surface plug-in upper support 321, and a surface plug-in upper plate 313 extending toward the inner side thereof is vertically arranged on the upper top surface of the outer panel 310, the surface plug-in upper plate 313 is arranged horizontally, and a surface plug-in ear 314 is protruding downward on the plate surface of the surface plug-in upper plate 313.

[0058] The surface insert inner component 32, such as Figure 5 As shown, including:

[0059] The inner panel 320 in contact with the outer wall of the frame box is arranged in a straight plate shape parallel to the outer panel 310, and abuts against the inner end faces of the horizontal rod 11 and the vertical rod 12 or the oblique rod 13. The outer surface of the inner panel 320 is provided with an oblique rod surface plug-in support 321 and a fourth protrusion 322. The oblique rod surface plug-in support 321 is arranged as a "7"-shaped horizontal section and an inclined section, and two groups are symmetrically arranged, and are in contact with the horizontal rod 11 and the oblique rod 13 respectively. The extension of the oblique rod surface plug-in support 321 is inclined and parallel to the upper side of the oblique rod 13. The plate surface of the inner panel 320 is provided with a through groove 321 through it. 3. The through groove 323 is arranged between two symmetrical groups of inclined rod surface plug-in lower supports 311 for inserting the flat rod 11. The fourth protrusion 322 is clamped in the "Λ"-shaped corner of the inclined rod surface plug-in lower support 311. A surface plug-in lower plate 324 extending outward thereof is vertically arranged on the upper top surface of the inner panel 320. The surface plug-in lower plate 324 is horizontally arranged below the surface plug-in upper plate 313. A surface plug-in chamfer 326 is arranged at the edge of the outer side surface of the surface plug-in lower plate 324 for convenient insertion between the surface plug-in upper plate 313 and the flat rod 11. A surface plug-in hole 325 clamped with the surface plug-in ear 314 is arranged on the plate surface of the surface plug-in lower plate 324.

[0060] According to the specific structure of an assembled modular frame box in the above embodiment, the method of assembling it is further described below:

[0061] A. Angle plug installation:

[0062] Insert the corner plug outer part 21 onto the vertical pole 12; at this time, the vertical pole 12 is between the two sets of diagonal pole corner plug lower supports 211, and the two vertical horizontal poles 11 and the diagonal poles 13 thereunder are between the diagonal pole corner plug lower supports 211 and the corner plug upper plate 213.

[0063] Insert the corner insert inner part 22 from the inside of the frame box; at this time, the two vertical horizontal rods 11 are located between the corner insert lower plate 223 and the diagonal rod corner insert upper support 221, and the diagonal rod 13 below the two vertical horizontal rods 11 is located between the diagonal rod corner insert lower support 211 and the diagonal rod corner insert upper support 221.

[0064] The corner insert lower plate 223 is inserted between the corner insert upper plate 213 and the flat rod 11 through the corner insert chamfer 225 until the corner insert clamping ears 214 and the corner insert clamping holes 224 are clamped, so that the corner insert outer component 21 and the corner insert inner component 22 are clamped into a whole.

[0065] B. Plug installation:

[0066] The surface-inserted inner component 32 is inserted onto the flat rod 11 .

[0067] Place the surface plug-in outer component 31 outside the frame box; at this time, the vertical rod 12 is between the two sets of inclined rod surface plug-in lower supports 311, and the two vertical horizontal rods 11 and the inclined rods 13 below them are between the inclined rod surface plug-in lower supports 311 and the surface plug-in upper plate 313.

[0068] Insert the surface insertion inner component 32 along the flat rod 11 from the inside of the frame box; at this time, the flat rod 11 is between the surface insertion lower plate 324 and the inclined rod surface insertion upper support 321, and the two groups of inclined rods 13 below the flat rod 11 are between the inclined rod surface insertion lower support 311 and the inclined rod surface insertion upper support 321.

[0069] The surface insertion lower plate 324 is inserted between the flat rods 11 of the surface insertion upper plate 313 through the surface insertion chamfer 326 until the surface insertion clamping ears 314 and the surface insertion clamping holes 325 are clamped, so that the surface insertion outer component 31 and the surface insertion inner component 32 are clamped into a whole.

[0070] In summary, the above is only a preferred embodiment of the utility model, and is not intended to limit the scope of the utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the content of the specification. All the so-called equal changes and modifications of the shape, structure, characteristics and spirit described in the scope of the requirements of the utility model should be included in the scope of the claims of the utility model.

Claims

1. An assembled frame box, comprising: The horizontal rod (11), the vertical rod (12) and the diagonal rod (13) are characterized by: The connection points of the horizontal rod (11), the vertical rod (12), and the oblique rod (13) are respectively provided with an angle insertion mechanism (2) and a surface insertion mechanism (3). The corner insertion mechanism (2) and the surface insertion mechanism (3) are respectively arranged at the four corners and eight sides of the frame box to limit the positions of the horizontal rod (11), the vertical rod (12), and the diagonal rod (13) and to securely fix them.

2. The assembled frame box according to claim 1, characterized in that: The four corners of the frame box include: Two mutually perpendicular horizontal rods (11), a vertical rod (12), and one to two diagonal rods (13); The corner insertion mechanism (2) is formed by a corner insertion outer component (21) and a corner insertion inner component (22) being snap-fitted together.

3. The assembled frame box according to claim 2, characterized in that: The corner plug outer component (21) comprises: An outer corner plate (210) in contact with the outer wall of the frame box, the outer corner plate (210) is arranged in a "┗" shape and abuts against the outer end surfaces of the horizontal rod (11), the vertical rod (12) and the oblique rod (13), an oblique rod corner plug lower support (211) is protrudingly provided on the inner plate surface of the outer corner plate (210), and an upper corner plug plate (213) extending inwardly thereof is vertically provided on the upper top surface of the outer corner plate (210), the upper corner plug plate (213) is arranged horizontally, and an angle plug ear (214) is protruding downwardly provided on the plate surface of the upper corner plug plate (213).

4. The assembled frame box according to claim 3 is characterized in that: The corner insert inner component (22) comprises: An inner corner plate (220) in contact with the outer wall of the frame box, the inner corner plate (220) being arranged in a "┗" shape parallel to the outer corner plate (210) and abutting against the inner end surfaces of the horizontal rod (11), the vertical rod (12) and the oblique rod (13), a protruding oblique rod corner plug upper support (221) being arranged on the outer plate surface of the inner corner plate (220), a corner plug lower plate (223) extending outwardly thereof being arranged vertically on the upper top surface of the outer corner plate (210), the corner plug lower plate (223) being arranged horizontally below the corner plug upper plate (213), and a corner plug hole (224) being engaged with the corner plug ear (214) being arranged on the plate surface of the corner plug lower plate (223).

5. The assembled frame box according to claim 4 is characterized in that: The oblique rod corner plug-in lower supports (211) are arranged in an "Λ" shape and are symmetrically arranged in two groups, and are respectively in contact with the vertical rod (12) and the oblique rod (13); the oblique rod corner plug-in upper supports (221) are arranged in a "7" shape and are symmetrically arranged in two groups, and are respectively in contact with the horizontal rod (11) and the oblique rod (13); the extensions of the oblique rod corner plug-in upper supports (221) and the oblique rod corner plug-in lower supports (211) are arranged obliquely and parallel to the upper and lower sides of the oblique rod (13); A first protrusion (212) is protrudingly provided on the inner plate surface of the outer corner plate (210), and the first protrusion (212) is clamped in the "7"-shaped corner of the diagonal rod corner plug upper support (221). A second protrusion (222) is protrudingly provided on the outer plate surface of the inner corner plate (220), and the second protrusion (222) is clamped in the "Λ"-shaped corner of the diagonal rod corner plug lower support (211).

6. The assembled frame box according to claim 5, characterized in that: The eight sides of the frame box include: A horizontal rod (11) and a vertical rod (12) or two diagonal rods (13); The surface insertion mechanism (3) is formed by a surface insertion outer component (31) and a surface insertion inner component (32) which are snap-fitted together.

7. The assembled frame box according to claim 6, characterized in that: The surface-inserted external component (31) comprises: A straight plate-shaped outer panel (310) in contact with the outer wall of the frame box, the outer panel (310) abutting against the outer end surfaces of the horizontal rod (11) and the vertical rod (12) or the oblique rod (13), an oblique rod surface insertion lower support (311) protrudingly provided on the inner plate surface of the outer panel (310), a surface insertion upper plate (313) extending inwardly thereof is vertically provided on the upper top surface of the outer panel (310), the surface insertion upper plate (313) is horizontally arranged, and a surface insertion clamping ear (314) protruding downwardly provided on the plate surface of the surface insertion upper plate (313).

8. The assembled frame box according to claim 7, characterized in that: The surface-inserted inner component (32) comprises: An inner panel (320) in contact with the outer wall of the frame box, the inner panel (320) being arranged in a straight plate shape parallel to the outer panel (310) and abutting against the inner end faces of the horizontal rod (11) and the vertical rod (12) or the oblique rod (13), a protruding oblique rod surface plug-in upper support (321) being arranged on the outer plate surface of the inner panel (320), a through groove (323) being arranged through the plate surface of the inner panel (320), the through groove (323) being used for inserting the horizontal rod (11), a surface plug-in lower plate (324) extending outwardly thereof being arranged vertically on the upper top surface of the inner panel (320), the surface plug-in lower plate (324) being arranged horizontally below the surface plug-in upper plate (313), and a surface plug-in hole (325) being arranged on the plate surface of the surface plug-in lower plate (324) for plugging with the surface plug-in ear (314) being plugged into.

9. The assembled frame box according to claim 8, characterized in that: The inclined rod surface inserted lower support (311) is arranged in an "Λ" shape and is symmetrically arranged in two groups, and is in contact with the vertical rod (12) and the inclined rod (13) respectively; the inclined rod surface inserted upper support (321) is arranged in a "7" shape and is symmetrically arranged in two groups, and is in contact with the flat rod (11) and the inclined rod (13) respectively, and the extension parts of the inclined rod surface inserted upper support (321) and the inclined rod surface inserted lower support (311) are arranged obliquely and parallel to the upper and lower sides of the inclined rod (13); the through groove (323) is arranged between the two symmetrical groups of inclined rod surface inserted lower supports (311); A third protrusion (312) is protrudingly provided on the inner side surface of the straight plate-shaped outer panel (310), and the third protrusion (312) is clamped in the "7"-shaped corner of the inclined rod surface inserted into the upper support (321). A fourth protrusion (322) is protrudingly provided on the outer side surface of the inner panel (320), and the fourth protrusion (322) is clamped in the "Λ"-shaped corner of the inclined rod surface inserted into the lower support (311).

10. The assembled frame box according to claim 8, characterized in that: The edge of the outer side surface of the corner plug lower plate (223) is provided with a corner plug chamfer (225) for facilitating insertion between the corner plug upper plate (213) and the flat rod (11); The edge of the outer side surface of the surface insertion lower plate (324) is provided with a surface insertion chamfer (326) for facilitating insertion between the surface insertion upper plate (313) and the flat rod (11).

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