Nonmetal plate connecting structure, nuclear power station equipment and manufacturing method

Abstract

The invention discloses a non-metal plate connecting structure, nuclear power station equipment and a manufacturing method, and relates to the technical field of nuclear power, and the non-metal plate connecting structure comprises a groove formed in a non-metal plate and a connecting plate located in the groove; a plurality of rotation limiting surfaces capable of limiting rotation of the connecting plate are limited by the groove, a first connecting hole and a first mounting hole are formed in the bottom wall of the groove, and a threaded sleeve is arranged in the first connecting hole; the connecting plate is provided with a second connecting hole matched with the first connecting hole and a second mounting hole matched with the first mounting hole, and the connecting plate and the non-metal plate are connected and fixed through a first fastener penetrating through the second connecting hole and the threaded sleeve; the non-metal plate sequentially penetrates through the fixing holes of the supporting frame, the second mounting holes and the first mounting holes through second fasteners to be connected and fixed. Single-point stress of the steel wire thread insert or the self-tapping screw and the like is converted into combined stress of the embedded connecting plate, the loosening problem caused by local rotation of the self-tapping screw or the steel wire thread insert can be avoided, and the connecting reliability of the non-metal plates is improved.

Description

Technical Field

[0001] The present application relates to the field of nuclear power technology, and more specifically, to a non-metallic plate connection structure, nuclear power plant equipment, and a manufacturing method thereof. Background Art

[0002] In the relevant field, the desktop of the operating table is usually made of non-metallic sheet material, and the installation structure of the operating table is required to be stable and reliable, and must meet the second-class seismic requirements. Traditional operating table desktops often use self-tapping screws or wire screw sleeves to fix the operating table desktop to the support frame, but in long-term use, there may be scenarios such as vibration, lifting, and shaking of the desktop, which may cause the self-tapping screws or wire screw sleeves to partially rotate and cause the desktop to loosen.

[0003] Therefore, how to improve the reliability of non-metallic sheet material connections has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0004] In view of this, an object of the present application is to provide a non-metallic plate connection structure to improve the reliability of the connection of non-metallic plates.

[0005] Another object of the present application is to provide a nuclear power plant equipment having the above-mentioned non-metallic plate connection structure.

[0006] Another object of the present application is to provide a method for manufacturing the above-mentioned non-metallic plate connection structure.

[0007] To achieve the above objectives, this application provides the following technical solutions:

[0008] A non-metallic plate connection structure, comprising:

[0009] A groove is provided on the non-metal plate, the groove limits a plurality of rotation limiting surfaces, a first connecting hole and a first mounting hole are provided on the bottom wall of the groove, and a threaded sleeve is provided in the first connecting hole;

[0010] A connecting plate is used to be installed in the groove, and the connecting plate is adapted to the groove so that each of the limiting surfaces can limit the rotation of the connecting plate. The connecting plate is provided with a second connecting hole that cooperates with the first connecting hole and a second mounting hole that cooperates with the first mounting hole. The connecting plate and the non-metallic plate are connected and fixed by a first fastener passing through the second connecting hole and the threaded sleeve of the first connecting hole. The non-metallic plate is used to be connected and fixed by a second fastener passing through the fixing hole of the support frame, the second mounting hole and the first mounting hole in sequence.

[0011] Optionally, in the above non-metal plate connection structure, there are at least two first connection holes, and each of the first connection holes and the first mounting holes are distributed in the same row or multiple rows, and the second connection holes are adapted to the first connection holes.

[0012] Optionally, in the above non-metal plate connection structure, the exposed surface of the connection plate is flush with the surface of the non-metal plate.

[0013] Optionally, in the above non-metal plate connection structure, the second connection hole is one of a counterbore, a countersunk hole, and a spot-facing hole.

[0014] Optionally, in the above non-metal plate connection structure, the head and tail of each of the rotation-limiting surfaces are connected to each other, and an included angle is formed between two adjacent rotation-limiting surfaces.

[0015] Optionally, in the above non-metal plate connection structure, the cross-sectional shape of the groove is a polygon.

[0016] Optionally, in the above non-metal plate connection structure, at least one of the rotation-limiting surface and the side wall of the connection plate is provided with a corrugated structure.

[0017] A nuclear power plant equipment, including an operation console;

[0018] The operation console includes a support frame and a tabletop arranged on the support frame. The tabletop is a non-metal plate, and the tabletop and the support frame are fixedly connected through the non-metal plate connection structure described in any one of the above.

[0019] Optionally, in the above nuclear power plant equipment, a plurality of non-metal plate connection structures are arranged at intervals between the tabletop and the support frame.

[0020] A manufacturing method for the non-metal plate connection structure described in any one of the above, including the steps of:

[0021] Grooving, machining the groove on the non-metal plate, and opening the first connection hole and the first mounting hole on the bottom wall of the groove;

[0022] Preparing a connection plate, and opening the second connection hole and the second mounting hole on the connection plate adapted to the groove;

[0023] Installing a threaded sleeve, embedding the threaded sleeve into the first connection hole, and filling potting glue between the outer wall of the threaded sleeve and the inner wall of the first connection hole;

[0024] Installing the connection plate, applying potting glue on the contact surface between the connection plate and the inner wall of the groove, pressing the connection plate into the groove, and fixedly connecting the connection plate to the threaded sleeve in the first connection hole by passing the first fastener through the second connection hole.

[0025] The non-metal plate connection structure provided by this application forms a plurality of rotation-limiting surfaces in a groove opened on the non-metal plate. The connecting plate adapted to the groove is installed in the groove, and a first fastener passes through the second connection hole of the connecting plate and is connected and fixed to the threaded sleeve in the first connection hole at the bottom wall of the groove. At the same time, a second fastener can sequentially pass through the fixing hole of the support frame, the second installation hole of the connecting plate, and the first installation hole at the bottom wall of the groove for connection and fixation, so as to realize the connection and fixation between the non-metal plate and the support frame. As can be seen from the above example, for the non-metal plate connection structure provided by this application, by opening a groove on the non-metal plate, installing the connecting plate in the groove, connecting and fixing with the first fastener, and at the same time connecting the connecting plate, the non-metal plate and the support frame with the second fastener, the rotation of the connection structure can be restricted by the cooperation of the rotation-limiting surface in the groove and the connecting plate, and the single-point force such as the traditional wire screw sleeve or self-tapping screw is changed into the combined force embedded in the connecting plate, which can avoid the loosening problem caused by the single-point local rotation of the self-tapping screw or wire screw sleeve, and improve the reliability of the connection of the non-metal plate.

[0026] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown separately in the drawings can be combined with each other arbitrarily as long as the combined technical features are not contradictory. All feasible feature combinations are the technical contents clearly recorded in this article. Any one of the sub-features included in the same sentence can be independently applied without necessarily being applied together with other sub-features. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0028] Figure 1 It is a schematic structural diagram of the non-metal plate connection structure provided by the embodiment of the present application;

[0029] Figure 2 It is a schematic flowchart of the manufacturing method provided by the embodiment of the present application.

[0030] Among them, 10 is the non-metal plate, 11 is the groove, 111 is the rotation-limiting surface, 112 is the first connection hole, 1121 is the threaded sleeve, 113 is the first installation hole, 20 is the connecting plate, 21 is the second connection hole, 22 is the second installation hole, 30 is the first fastener, and 40 is the second fastener. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The core of the present application lies in providing a non-metal plate connection structure to improve the reliability of the connection of non-metal plates.

[0032] Another core of the present application lies in providing a nuclear power plant equipment with the above non-metal plate connection structure.

[0033] Another core of the present application lies in providing a manufacturing method for the above non-metal plate connection structure.

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0035] In the related field, especially in the field of nuclear power plants, the desktop of the equipment console is usually made of non-metal plates, and the installation structure of the console desktop requires firmness and reliability, and needs to meet the requirements of class II seismic resistance. In the traditional console desktop, self-tapping screws or wire thread inserts are often used to fix the console desktop to the support frame. However, in long-term use, there may be scenarios such as vibration, lifting, and shaking of the desktop, which may cause local rotation of the self-tapping screws or wire thread inserts, resulting in the loosening of the desktop.

[0036] For this reason, as Figure 1 shown, the embodiments of the present application disclose a non-metal plate connection structure, including a groove 11 opened on the non-metal plate 10 and a connecting plate 20. By opening a groove 11 on the non-metal plate 10 and installing the connecting plate 20 in the groove 11, and connecting and fixing it through the first fastener 30, and at the same time connecting the connecting plate 20, the non-metal plate 10 and the support frame through the second fastener 40, the rotation of the connection structure can be restricted by the cooperation of the rotation-limiting surface 111 in the groove 11 and the connecting plate 20, and the single-point force such as the traditional wire thread insert or self-tapping screw can be changed into the combined force embedded in the connecting plate 20, which can avoid the loosening problem caused by the single-point local rotation of the self-tapping screw or wire thread insert, and improve the reliability of the connection of non-metal plates.

[0037] Next, the non-metal plate connection structure disclosed in the embodiments of the present application will be specifically explained and described in conjunction with Figure 1 this.

[0038] Among them, as Figure 1As shown, a groove 11 is formed in the non-metallic plate 10, and the connecting plate 20 is installed in the groove 11. At the same time, the groove 11 is formed with a plurality of rotation-limiting surfaces 111, and the connecting plate 20 is adapted to the groove 11 so that each rotation-limiting surface 111 can limit the rotation of the connecting plate 20. In addition, a first connection hole 112 and a first mounting hole 113 may be formed in the bottom wall of the groove 11. A threaded sleeve 1121 is arranged in the first connection hole 112, and a second connection hole 21 adapted to the first connection hole 112 and a second mounting hole 22 adapted to the first mounting hole 113 may be formed in the connecting plate 20, so that the connecting plate 20 and the non-metallic plate 10 can be fixedly connected by a first fastener 30 passing through the second connection hole 21 and the threaded sleeve 1121 in the first connection hole 112. At the same time, the non-metallic plate 10 can be fixedly connected by a second fastener 40 passing through the fixing hole of the support frame, the second mounting hole 22 and the first mounting hole 113 in sequence, so that the single-point force such as the traditional wire screw sleeve or self-tapping screw can be changed into the combined force embedded in the connecting plate 20, and the loosening problem caused by the single-point local rotation of the self-tapping screw or wire screw sleeve can be avoided, and the reliability of the connection of the non-metallic plate is improved.

[0039] In some embodiments, as Figure 1 shown, at least two first connection holes 112 may be adopted on the bottom wall of the groove 11, that is, the first connection holes 112 may be two, three or more, and each first connection hole 112 and the first mounting hole 113 may be distributed in the same row, or may be distributed in two rows, three rows or more rows. At the same time, the second connection hole 21 of the connecting plate 20 is adapted to the first connection hole 112, that is, each first connection hole 112 corresponds to a second connection hole 21. Wherein, an internal thread portion may be arranged on the inner wall of the first connection hole 112, and thread portions may be arranged on both the inner wall and the outer wall of the threaded sleeve 1121, so that the threaded sleeve 1121 can be threadedly connected with the first connection hole 112, and at the same time, the first fastener 30 can pass through the second connection hole 21 of the connecting plate 20 and be threadedly connected with the threaded sleeve 1121 in the first connection hole 112.

[0040] In some embodiments, in order to ensure the aesthetics of the outer surface of the non-metallic plate, the thickness of the connecting plate 20 is equal to the depth of the groove 11, so as to ensure that the exposed surface of the connecting plate 20 is flush with the surface of the non-metallic plate 10, that is, the side of the connecting plate 20 facing away from the contact surface with the bottom wall of the groove 11 is in the same plane as the surface of the non-metallic plate 10. At the same time, as Figure 1 shown, the second connection hole 21 may adopt one of a counterbore hole, a countersunk hole and a spot-facing hole, so that the first fastener 30 can be located in the second connection hole 21, and the head of the first fastener 30 is in the same plane as the surface of the non-metallic plate 10. Optionally, as Figure 1As shown, the second connection hole 21 can be a counterbore hole, and the first fastener 30 can be an M6 countersunk head screw, so that the head of the first fastener 30 can cooperate with the counterbore hole, ensuring that the head of the first fastener 30 and the surface of the non-metallic plate 10 are on the same plane.

[0041] In some embodiments, as Figure 1 shown, the number of the first mounting holes 113 on the bottom wall of the groove 11 can be one, or two, three or more, and the second mounting holes 22 of the connecting plate 20 are adapted to the first mounting holes 113, that is, each first mounting hole 113 corresponds to a second mounting hole 22. Among them, the first mounting holes 113 can be threaded holes, while the fixing holes of the support frame and the second mounting holes 22 of the connecting plate 20 can be clearance holes, so that the second fastener 40 can sequentially pass through the fixing holes of the support frame, the second mounting holes 22 of the connecting plate 20 and the first mounting holes 113 on the bottom wall of the groove 11 for connection and fixation, thereby realizing the connection and fixation between the non-metallic plate 10 and the support frame. It should be noted that the second fastener 40 can be an M8 bolt or the like, which is not limited herein.

[0042] In some embodiments, the respective rotation-limiting surfaces 111 are connected end to end to enclose and form the groove 11. There is an included angle between two adjacent rotation-limiting surfaces 111, where the included angle is not less than 60° and less than 180°. At the same time, the shape of the connecting plate 20 matches the shape of the groove 11, so that the respective rotation-limiting surfaces 111 can limit the rotation of the connecting plate 20. Optionally, the cross-sectional shape of the groove 11 can be a polygon such as a triangle, a rectangle, a trapezoid, a pentagon, etc., to form the rotation-limiting surfaces 111 on the side walls of the groove 11. At the same time, the connecting plate 20 can be a polygon such as a triangle, a rectangle, a trapezoid, a pentagon, etc. adapted to the groove 11, so that through the cooperation of the groove 11 and the connecting plate 20, the loosening problem caused by single-point local rotation such as self-tapping screws or wire thread inserts can be avoided, and the reliability of the connection of the non-metallic plate is improved.

[0043] In some embodiments, a corrugated structure can be provided on at least one of the rotation-limiting surface 111 and the side wall of the connecting plate 20, that is, the corrugated structure can be provided on the rotation-limiting surface 111, or the corrugated structure can be provided on the side wall of the connecting plate 20. Of course, the corrugated structure can also be provided on both the rotation-limiting surface 111 and the side wall of the connecting plate 20 to increase the friction between the connecting plate 20 and the rotation-limiting surface 111 and ensure the reliability of the connection between the connecting plate 20 and the non-metallic plate 10. It should be noted that the corrugated structure can be a plurality of ribs provided on the surface, or a plurality of protrusions provided on the surface, or a pattern formed by protrusions and grooves that can be arranged at intervals provided on the surface, which is not limited herein.

[0044] The non-metallic plate connection structure disclosed in the embodiments of the present application forms a plurality of rotation-limiting surfaces 111 in the groove 11 by opening a groove 11 in the non-metallic plate 10. The connecting plate 20 adapted to the groove 11 is installed in the groove 11, and the first fastener 30 passes through the second connection hole 21 of the connecting plate 20 and is connected and fixed to the threaded sleeve 1121 in the first connection hole 112 at the bottom wall of the groove 11. At the same time, the second fastener 40 can sequentially pass through the fixing hole of the support frame, the second installation hole 22 of the connecting plate 20 and the first installation hole 113 at the bottom wall of the groove 11 for connection and fixation, so as to realize the connection and fixation between the non-metallic plate 10 and the support frame.

[0045] The non-metallic plate connection structure disclosed in the embodiments of the present application forms a groove 11 in the non-metallic plate 10, installs the connecting plate 20 in the groove 11, and connects and fixes it through the first fastener 30. At the same time, the second fastener 40 connects the connecting plate 20, the non-metallic plate 10 and the support frame. The rotation-limiting surface 111 in the groove 11 can cooperate with the connecting plate 20 to limit the rotation of the connection structure, and change the single-point force such as the traditional wire screw sleeve or self-tapping screw into the combined force embedded in the connecting plate 20, which can avoid the loosening problem caused by the single-point local rotation of the self-tapping screw or wire screw sleeve, and improve the reliability of the connection of the non-metallic plate.

[0046] It should be noted that in the present application, the support frame can be a metal part or a non-metal part. At the same time, the non-metallic plate connection structure can also be used for the connection between a non-metallic plate and a metal plate, or the connection between non-metallic plates, which is not limited herein.

[0047] The embodiments of the present application also disclose a nuclear power plant device, including an operating platform, which may include a support frame and a desktop arranged on the support frame, and the desktop is made of the non-metallic plate 10. Among them, the desktop and the support frame can be connected and fixed through the non-metallic plate connection structure disclosed in the above embodiments. Therefore, the nuclear power plant device has all the technical effects of the above non-metallic plate connection structure, which will not be elaborated herein.

[0048] In some embodiments, a plurality of non-metallic plate connection structures distributed at intervals can be arranged between the desktop and the support frame, that is, the non-metallic plate connection structures can be two, three, four or more, and each non-metallic plate connection structure can be located in the same row or arranged in an array. Among them, the number and distribution mode of the non-metallic plate connection structures can be determined according to the desktop shape and actual requirements.

[0049] Such as Figure 2As shown in the figure, the embodiments of the present application also disclose a manufacturing method for the non-metal plate connection structure disclosed in the above embodiments, and thus have all the technical effects of the above non-metal plate connection structure, which will not be elaborated herein. This manufacturing method includes step S100 of grooving, step S200 of preparing a connecting plate, step S300 of installing a threaded sleeve, and step S400 of installing the connecting plate. The following will combine Figure 1 and Figure 2 to specifically explain and illustrate the manufacturing method disclosed in the embodiments of the present application.

[0050] Step S100, grooving;

[0051] A groove 11 is milled on the non-metal plate 10 by a mechanical milling machine. At the same time, a first connection hole 112 and a first mounting hole 113 are respectively opened on the bottom wall of the groove 11. Exemplarily, a rectangular groove 11 is milled on the non-metal plate 10 by a mechanical milling machine. At the same time, two first connection holes 112 with a diameter of 6 mm are respectively opened on the bottom wall of the groove 11 for installing the threaded sleeve 1121, and a threaded through hole with a diameter of 10 mm is opened at the middle position between the two first connection holes 112 to reserve an installation space for installing a second fastener 40 such as an M8 bolt.

[0052] Step S200, preparing a connecting plate;

[0053] A connecting plate 20 adapted to the groove 11 is made of a stainless steel plate, and a second connection hole 21 and a second mounting hole 22 are respectively opened on the connecting plate 20. Optionally, the second connection hole 21 can adopt a counterbore corresponding to the first connection hole 112 to match a first fastener 30 such as an M6 countersunk head screw, ensuring that the surface of the connecting plate 20 is flush with the surface of the non-metal plate 10 after installation. At the same time, the second mounting hole 22 can adopt a through hole with a diameter of 10 mm.

[0054] Step S300, installing a threaded sleeve;

[0055] The threaded sleeve 1121 is embedded into the first connection hole 112, and potting glue is filled between the outer wall of the threaded sleeve 1121 and the inner wall of the first connection hole 112, so as to effectively avoid the defect of insufficient installation strength caused by the threaded fit between the threaded sleeve 1121 and the first connection hole 112. It should be noted that the potting glue can adopt AB glue, etc., which is not limited herein.

[0056] Step S400, installing the connecting plate;

[0057] Apply potting adhesive on the contact surface between the connecting plate 20 and the inner wall of the groove 11, that is, on the contact surface between the connecting plate 20 and the bottom wall of the groove 11, and also on the side wall of the connecting plate 20. Then press the connecting plate 20 into the groove 11, and connect and fix the connecting plate 20 and the non-metal plate by passing a first fastener 30 such as an M6 countersunk head screw through the second connection hole 21 and connecting with the threaded sleeve 1121 in the first connection hole 112.

[0058] It should be noted that when connecting the non-metal plate and the support frame, only need to sequentially pass a second fastener 40 such as an M8 bolt through the fixing hole of the support frame, the second mounting hole 22 of the connecting plate 20 and threadedly fit and connect with the first mounting hole 113 at the bottom wall of the groove 11.

[0059] The terms "first" and "second" etc. in the specification, claims and above-mentioned drawings of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units not listed.

[0060] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-metal plate connection structure, characterized in that Including: A groove (11) formed on the non-metal plate (10), the groove (11) defining a plurality of rotation-limiting surfaces (111), the bottom wall of the groove (11) being provided with a first connection hole (112) and a first mounting hole (113), and a threaded sleeve (1121) being arranged in the first connection hole (112); A connecting plate (20) for being installed in the groove (11), and the connecting plate (20) being adapted to the groove (11) so that each of the rotation-limiting surfaces (111) can limit the rotation of the connecting plate (20), the connecting plate (20) being provided with a second connection hole (21) cooperating with the first connection hole (112) and a second mounting hole (22) cooperating with the first mounting hole (113), the connecting plate (20) and the non-metal plate (10) being fixedly connected by a first fastener (30) passing through the second connection hole (21) and connecting with the threaded sleeve (1121) of the first connection hole (112), and the non-metal plate (10) being used for being fixedly connected by a second fastener (40) passing through the fixing hole of the support frame, the second mounting hole (22) and the first mounting hole (113) in sequence.

2. The non-metal plate connection structure according to claim 1, wherein There are at least two first connection holes (112), and each of the first connection holes (112) and the first mounting hole (113) are distributed in the same row or multiple rows, and the second connection hole (21) is adapted to the first connection hole (112).

3. The non-metal plate connection structure according to claim 1, characterized in that, The exposed surface of the connecting plate (20) is flush with the surface of the non-metal plate (10).

4. The non-metal plate connection structure according to claim 1, wherein, The second connection hole (21) is one of a counterbore, a countersunk hole and a spot-facing hole.

5. The non-metal plate connection structure according to claim 1, characterized in that, The head and tail of each of the rotation-limiting surfaces (111) are connected to each other, and an included angle is formed between two adjacent rotation-limiting surfaces (111).

6. The non-metal plate connection structure according to claim 1, characterized in that The cross-sectional shape of the groove (11) is polygonal.

7. The non-metal plate connection structure according to any one of claims 1 to 6, characterized in that, At least one of the rotation-limiting surface (111) and the side wall of the connecting plate (20) is provided with a corrugated structure.

8. A nuclear power plant equipment, characterized in that, Including an operating table; The operating table includes a support frame and a tabletop arranged on the support frame, the tabletop being a non-metal plate (10), and the tabletop and the support frame being fixedly connected by the non-metal plate connection structure according to any one of claims 1 to 7.

9. The nuclear power plant equipment according to claim 8, characterized in that, A plurality of spaced-apart non-metal plate connection structures are arranged between the tabletop and the support frame.

10. A manufacturing method for the non-metal plate connection structure according to any one of claims 1 to 8, characterized in that, Including steps: Grooving, machining the groove (11) on the non-metal plate (10), and opening the first connection hole (112) and the first mounting hole (113) on the bottom wall of the groove (11); Preparing a connecting plate, opening the second connection hole (21) and the second mounting hole (22) on the connecting plate (20) adapted to the groove (11); Installing a threaded sleeve, embedding the threaded sleeve (1121) into the first connection hole (112), and filling potting glue between the outer wall of the threaded sleeve (1121) and the inner wall of the first connection hole (112); Install the connecting plate, apply potting glue on the contact surface between the connecting plate (20) and the inner wall of the groove (11), press the connecting plate (20) into the groove (11), and connect and fix the connecting plate (20) by passing the first fastener (30) through the second connecting hole (21) and the threaded sleeve (1121) in the first connecting hole (112).

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