CN218462091U

CN218462091U - Nut holding assembly

Info

Publication number: CN218462091U
Application number: CN202222415537.7U
Authority: CN
Inventors: 刘子杰; 祝早平; 王海渊
Original assignee: Shanghai Chint Intelligent Technology Co Ltd
Current assignee: Shanghai Chint Intelligent Technology Co Ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-02-10
Anticipated expiration: 2032-09-13

Abstract

The utility model discloses a nut keeps subassembly belongs to contactor technical field, and the nut keeps the subassembly to include nut holder and flash barrier. The nut retaining piece is provided with a plurality of fixing grooves at intervals along a first direction, nuts can be fixed in the fixing grooves, the nut retaining piece can be fixed on a shell of the contactor, and the fixing grooves can correspond to wiring rows of the contactor one by one; the flash barrier is provided with a plurality of and can be connected with the nut holder, and the flash barrier can be arranged in respectively between the adjacent wiring row of contactor in order to keep apart the wiring row. The utility model provides a nut keeps subassembly, contactor and thermal relay, prefabricated wire or binding post's dismouting in-process, no longer need extra instrument fixation nut, only need revolve the bolt of twisting the row of wearing to establish just can realize the fastening between bolt and the nut and become flexible, easy dismounting is reliable. In addition, the flash barrier is arranged in between the adjacent line bank of contactor in order to keep apart the line bank, can effectively separate the electric arc of different phases, guarantees the power consumption safety.

Description

Nut holding assembly

Technical Field

The utility model relates to a contactor technical field especially relates to a nut keeps subassembly.

Background

The contactor is applied to electric power, power distribution and power utilization occasions. The contactor is an electrical appliance which is used for controlling a load by using a coil to flow current to generate a magnetic field to close a contact in industrial electricity.

Currently, contactors are typically connected to thermal relays by means of a bolt and nut fit, and contactors are also mounted to pre-fabricated wires or terminals by means of a bolt and nut fit. When connecting, because of the space of block terminal is limited, instrument such as spanner is difficult to operate the nut, and the dismouting is very inconvenient. In addition, arcs of different phases generated by the contact banks may interact with each other to damage the contacts and the external devices.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a nut keeps subassembly, can fixation nut in order to make things convenient for the dismouting, and can the electric arc of separation different phases.

To achieve the purpose, the utility model adopts the following technical proposal:

there is provided a nut holding assembly comprising:

the nut retaining piece is provided with a plurality of fixing grooves at intervals along a first direction, nuts can be fixed in the fixing grooves, the nut retaining piece can be fixed on a shell of the contactor, and the fixing grooves can correspond to the wiring rows of the contactor one by one;

the arc isolation plates are arranged in a plurality and can be connected with the nut retaining pieces, and the arc isolation plates can be respectively arranged between the adjacent wiring bars of the contactor to isolate the wiring bars.

Optionally, the nut holder comprises:

a plurality of fixing parts are arranged at intervals along the first direction, and each fixing part is provided with a fixing groove;

the connecting portion are provided with a plurality of and set up respectively adjacently between the fixed part, be provided with first joint portion on the connecting portion, first joint portion can with second joint portion joint on the shell, the flash barrier can with connecting portion connect.

Optionally, a plurality of strip-shaped protrusions are arranged in the fixing groove at intervals along the circumferential direction, and a chamfer surface is arranged at one end, facing the opening of the fixing groove, of each strip-shaped protrusion.

Optionally, the nut holder is provided with a plurality of positioning protrusions at intervals along a first direction, the positioning protrusions and the first clamping portion are located on the same side of the nut holder, and the positioning protrusions can be attached to the shell.

Optionally, a containing groove is formed in the connecting portion, and one end of the arc isolating plate can be inserted into the containing groove.

Optionally, the inner side surface of the accommodating groove is provided with a clamping protrusion, and the arc isolating plate is provided with a clamping groove connected with the clamping protrusion in a matched manner.

Optionally, the shell has the ladder face, nut holder dorsad one side of fixed slot is followed the first direction interval is provided with the support, nut holder can arrange in the ladder face with between the terminal row, just the tip of support with the ladder face butt, the tip of fixed slot with the terminal row butt.

Optionally, the arc baffle is provided with a third clamping portion, and the third clamping portion can be clamped with a fourth clamping portion on the shell.

Optionally, the flash barrier includes the limiting plate of two relative settings, the limiting plate is followed the third direction court the flash barrier is equipped with one side extension setting of third joint portion, just third joint portion arranges in two between the limiting plate.

Optionally, a through hole is formed in the center of the bottom of the fixed groove, and the periphery of the through hole is communicated with a dismounting hole.

Optionally, the flash barrier includes a partition plate and a reinforcing plate, and the partition plate and the reinforcing plate are vertically arranged so that the flash barrier is in a cross shape.

Has the advantages that:

the utility model provides a nut keeps the subassembly is fixed in the fixed slot with the nut and is fixed in the nut holder on the shell of contactor so that the nut in the fixed slot and the wiring row one-to-one of contactor, and contactor and electrothermal relay, prefabricated wire or binding post's dismouting in-process no longer need extra instrument fixation nut, only need twist the bolt of wearing to establish the wiring row soon and just can realize the fastening between bolt and the nut and become flexible, and easy dismounting is reliable. In addition, the flash barrier is arranged in between the adjacent terminal row of contactor in order to keep apart the terminal row, can effectively the electric arc of different phases of separation, guarantees the power consumption safety.

Drawings

Fig. 1 is an installation schematic diagram of a nut holding assembly according to an embodiment of the present invention;

fig. 2 is a schematic view of a nut holder according to an embodiment of the present invention;

fig. 3 is a schematic view of another perspective structure of the nut holder according to an embodiment of the present invention;

fig. 4 is a schematic view of another perspective structure of the nut holder according to an embodiment of the present invention;

fig. 5 is a schematic view of an arc barrier according to an embodiment of the present invention;

fig. 6 is a schematic view of another view structure of the arc barrier according to an embodiment of the present invention;

fig. 7 is a schematic view of a view angle structure of the arc barrier according to the second embodiment of the present invention;

fig. 8 is a schematic view of another view angle structure of the arc barrier according to the second embodiment of the present invention;

fig. 9 is an installation diagram of the nut holding assembly according to the second embodiment of the present invention.

In the figure:

100. a nut retainer; 110. a fixed part; 111. fixing grooves; 1111. a through hole; 1112. disassembling the hole; 112. a strip-shaped bulge; 1121. chamfering; 113. positioning a projection; 114. a support member; 120. a connecting portion; 121. a first clamping part; 122. an insertion arm; 1221. a containing groove; 123. clamping the protrusions;

200. an arc baffle plate; 210. a partition plate; 211. a clamping groove; 220. a reinforcing plate; 230. a rib plate; 240. a third clamping connection part; 241. connecting blocks; 242. an extension plate; 2421. a first limit protrusion; 2422. reserving a groove; 250. a limiting plate; 251. an extension portion;

300. a housing; 310. a connecting surface; 311. a second clamping part; 312. a fourth clamping part; 320. a step surface;

400. and (6) a wiring bank.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

Example one

Referring to fig. 1 to 3, the present embodiment provides a nut holding assembly including a nut holder 100 and an arc barrier 200. The nut holder 100 is provided with a plurality of fixing grooves 111 at intervals along a first direction, nuts can be fixed in the fixing grooves 111, the nut holder 100 can be fixed on a shell 300 of the contactor, and the fixing grooves 111 can correspond to the terminal strips 400 of the contactor one by one; the arc barrier 200 is provided in plurality and can be connected to the nut holder 100, and the arc barrier 200 can be respectively disposed between the adjacent terminal blocks 400 of the contactor to isolate the terminal blocks 400. Wherein, the a direction in fig. 1 is the first direction.

In this embodiment, the nuts are fixed in the fixing grooves 111 and the nut holders 100 are fixed on the casing 300 of the contactor so that the nuts in the fixing grooves 111 correspond to the wiring bars 400 of the contactor one to one, and in the dismounting process of the contactor and the thermal relay, the prefabricated conducting wire or the wiring terminal, the nuts are fixed without extra tools, and the bolts penetrating the wiring bars 400 are only screwed to fasten and loosen the bolts between the bolts and the nuts, so that the dismounting is convenient and reliable. In addition, the arc isolating plate 200 is arranged between the adjacent wiring bars 400 of the contactor to isolate the wiring bars 400, so that electric arcs of different phases can be effectively isolated, and the power utilization safety is ensured. Of course, the nut holding assembly may also be used for mounting other electrical components, and is not overly limited herein.

In the present embodiment, referring to fig. 2 to 4, the nut holder 100 includes a fixing portion 110 and a connecting portion 120. Wherein, the fixing parts 110 are provided with a plurality of fixing parts 110 at intervals along a first direction, and each fixing part 110 is provided with a fixing groove 111; the connecting portion 120 is provided with a plurality of and sets up respectively between adjacent fixed part 110, is provided with first joint portion 121 on the connecting portion 120, and first joint portion 121 can be connected with the second joint portion 311 joint on the shell 300, and the flash barrier 200 can be connected with connecting portion 120. In this embodiment, the nut holder 100 is composed of the fixing portion 110 and the connecting portion 120, so that the injection molding is facilitated, and the connecting portion 120 is connected with the housing 300 in a clamping manner, so that the nut holder is convenient and fast.

Preferably, the fixing part 110 has a square shape.

Preferably, the fixing part 110 is provided with three phase terminal blocks 400 corresponding to the contactors, respectively.

Specifically, be provided with a plurality of bar-shaped protrusion 112 along the circumference interval in the fixed slot 111, bar-shaped protrusion 112 extends the setting along the second direction, and fixed slot 111 has fine fixed action to the screw through bar-shaped protrusion 112. In addition, the contact area between the strip-shaped protrusion 112 and the nut is small, so that the sliding friction force between the strip-shaped protrusion and the nut is small, and the nut is convenient to mount and dismount. Further, a chamfered surface 1121 is arranged at one end of the strip-shaped protrusion 112, which faces the opening of the fixing groove 111, and the chamfered surface 1121 has the function of guiding the nut to move towards the bottom of the fixing groove 111, so that the nut is further convenient to mount and fix. Wherein the direction b in fig. 1 is the second direction.

Specifically, the through hole 1111 is arranged at the center of the bottom of the fixing groove 111 to provide an avoiding space, so that the bolt fixing device is suitable for bolts with different lengths. Furthermore, the peripheral side of the through hole 1111 is communicated with a dismounting hole 1112, so that the nut can be ejected out of the fixing groove 111 through tools such as a screwdriver, and the like, and the nut is convenient and quick to use.

Specifically, as shown in fig. 1 to 3, the housing 300 has a connection surface 310, the terminal block 400 penetrates out of the interior of the contactor through the connection surface 310 along the third direction, the terminal block 400 is disposed at intervals along the first direction, and a second clamping portion 311 is disposed on the connection surface 310 between adjacent terminal blocks 400. Wherein the direction c in fig. 1 is the third direction.

Preferably, the first engaging portion 121 is a slot structure, and the second engaging portion 311 is a buckle structure. The first connecting portion 120 includes two clamping arms, a clamping groove is formed between the two clamping arms, and the clamping groove extends along the second direction. Specifically, the inner side of one of the two clamping arms is provided with a first hook, the corresponding second clamping portion 311 is provided with a second hook, and the first hook and the second hook are mutually buckled to realize the clamping of the first clamping portion 121 and the second clamping portion 311, so as to realize the positioning of the nut holder 100 relative to the housing 300 along the first direction.

Further, two clamping arms are protruded out of the connecting portion 120 in the first direction, so that the first clamping portion 121 and the second clamping portion 311 have a larger contact area, and the stability of connection between the first clamping portion 121 and the second clamping portion 311 is ensured.

Further, the first clamping portion 121 can also be formed by arranging first hooks on the inner sides of the two clamping arms, and arranging second hooks on the two opposite sides of the corresponding second clamping portion 311, so as to increase the stability of the connection between the first clamping portion 121 and the second clamping portion 311. Of course, the first clamping portion 121 and the second clamping portion 311 can also be in other shapes, and are not limited herein.

It should be noted that the thickness of the connecting portion 120 is smaller than the thickness of the fixing portion 110, the toughness of the connecting portion 120 is better than that of the fixing portion 110, and when the first engaging portion 121 is engaged with the second engaging portion 311, the connecting portion 120 and the first engaging portion 121 are not easily broken.

In this embodiment, with continued reference to fig. 1 to 3, the nut holder 100 is provided with a plurality of positioning protrusions 113 at intervals along the first direction, the positioning protrusions 113 and the first clamping portions 121 are located on the same side of the nut holder 100, and the positioning protrusions 113 can be attached to the housing 300, so as to position the nut holder 100 relative to the housing 300 along the third direction. Specifically, the positioning protrusion 113 is attached to the attachment surface 310.

Specifically, the positioning protrusion 113 is disposed on the fixing portion 110, and the positioning protrusion 113 and the first clamping portion 121 are located on the same side of the nut holder 100. Further, two positioning protrusions 113 are provided and are respectively located on the fixing portions 110 at both ends of the nut holder 100.

In this embodiment, as shown in fig. 1 to 4, the housing 300 has a stepped surface 320, the side of the nut holder 100 facing away from the fixing groove 111 is provided with the supporting members 114 at intervals along the first direction, the nut holder 100 can be placed between the stepped surface 320 and the wire bank 400, the end of the supporting member 114 abuts against the stepped surface 320, and the end of the fixing groove 111 abuts against the wire bank 400, so as to position the nut holder 100 relative to the housing 300 in the second direction, and make the nut holder 100 not easy to loosen.

Specifically, the stepped surface 320 is located below the terminal block 400 in the second direction, and the stepped surface 320 is disposed parallel to the terminal block 400.

In this embodiment, as shown in fig. 1 to fig. 2, the connecting portion 120 is provided with an accommodating groove 1221, one end of the arc-isolating plate 200 is inserted into the accommodating groove 1221, and the nut holder 100 and the arc-isolating plate 200 are connected in an insertion manner, so that the positioning is reliable, simple and fast. In addition, in order to facilitate the insertion of the arc barrier 200 into the receiving groove 1221, the edge of the arc barrier 200 inserted into the receiving groove 1221 and the end of the receiving groove 1221 are chamfered.

In this embodiment, referring to fig. 2, 3, 5 and 6, the arc barrier 200 includes a partition 210 and a reinforcing plate 220, and the partition 210 and the reinforcing plate 220 are vertically disposed to make the arc barrier 200 in a cross shape, so that the arc barrier 200 has strong structural stability. Further, the accommodating groove 1221 is also cross-shaped according to the shape of the arc barrier 200.

Specifically, the receiving groove 1221 and the fixing groove 111 are located on the same side of the nut holder 100, and the receiving groove 1221 is surrounded by a plurality of insertion arms 122 of the connecting portion 120 extending along the second direction. Specifically, four insertion arms 122 are provided, and the shape is L-shaped, so that the arc-isolating plate 200 can be conveniently inserted into the accommodating groove 1221.

Further, rib plates 230 are disposed at opposite sides of the barrier plate 210 to further enhance the structural stability of the arc barrier plate 200. In addition, rib plate 230 extends along the third direction, and when arc baffle 200 is inserted into insertion receiving groove 1221, rib plate 230 abuts against the end of receiving groove 1221, has a limiting effect, and is convenient for observe whether arc baffle 200 is inserted in place.

Further, be provided with joint arch 123 on the medial surface of storage tank 1221, be provided with on the flash barrier 200 with the protruding 123 accordant connection's of joint groove 211, when flash barrier 200 pegged graft with storage tank 1221, joint arch 123 and joint groove 211 joint, and then make flash barrier 200 and nut holder 100 keep relatively fixed. In this embodiment, the arc-isolating plate 200 and the nut holder 100 are assembled and then mounted on the housing 300, and when the arc-isolating plate 200 and the nut holder 100 are mounted on the housing, the clamping protrusions 123 and the clamping grooves 211 can effectively prevent the arc-isolating plate 200 and the nut holder 100 from loosening, thereby ensuring the mounting efficiency. Of course, the nut holder 100 may be mounted on the housing 300 before the arc barrier 200 is mounted on the housing 300.

Specifically, the two opposite sides of the partition plate 210 are provided with the clamping grooves 211, and the inner side surfaces of the corresponding accommodating grooves 1221 are also provided with two clamping protrusions 123, so that the connection between the arc isolating plate 200 and the nut holder 100 is more stable.

In this embodiment, the arc barrier 200 is provided with a third engaging portion 240, and the third engaging portion 240 can engage with a fourth engaging portion 312 on the housing 300, so as to fix the arc barrier 200 relative to the housing 300.

Specifically, the third engaging portion 240 is disposed at one side edge of the arc barrier 200 along the third direction, and the third engaging portion 240 includes a connecting block 241 and an extending plate 242. The connecting block 241 is disposed at an edge of the partition 210 along a third direction, the extending plate 242 is disposed at an end of the connecting block 241 away from the partition 210, the extending plate 242 extends toward the clamping groove 211 along a second direction, a first limiting protrusion 2421 is disposed at an extending end of the extending plate 242, and the first limiting protrusion 2421 extends toward an end away from the partition 210.

Further, the fourth clamping portion 312 is configured as a second limiting protrusion disposed on the connection surface 310, when the nut holding assembly is fixed on the housing 300, the first limiting protrusion 2421 is located between the second limiting protrusion and the stepped surface 320, and the first limiting protrusion 2421 abuts against the second limiting protrusion to make the nut holding assembly on the housing 300 more firm.

It should be noted that, in order to adapt to the installation situation that the nut holder 100 is installed on the housing 300 first and then the arc-isolating plate 200 is installed on the housing 300, the connecting block 241 is protruded out of the partition plate 210, so that a deformation yielding space of the third clamping portion 240 is formed between the extending plate 242 and the partition plate 210. Further, the lower edge of the first stopper 2421 in the second direction is chamfered.

Further, the reinforcing plate 220 is closer to one side edge of the arc barrier 200 where the third fastening portion 240 is disposed, and the connecting block 241 extends to the reinforcing plate 220.

Further, a reserved groove 2422 is formed in the extending plate 242, and the reserved groove 2422 extends to the first limiting protrusion 2421 along the second direction, so that injection molding at the third clamping portion 240 is facilitated.

Example two

The present embodiment is different from the first embodiment in that the arc baffle 200 of the nut holding assembly, in the present embodiment, as shown in fig. 7 to 9, the arc baffle 200 includes not only the partition 210 and the reinforcing plate 220, but also two opposite limiting plates 250, the limiting plates 250 extend toward one side of the arc baffle 200 where the third fastening portion 240 is disposed along the third direction, and the third fastening portion 240 is disposed between the two limiting plates 250. In this embodiment, the setting of limiting plate 250 increases the protection degree of flash barrier 200, and the electric arc of different phases of separation is guaranteed the power consumption safety more effectively.

Specifically, the third engaging portion 240 does not have the reserved groove 2422.

Specifically, the one end and the gusset plate 220 of limiting plate 250 are connected, and the other end of limiting plate 250 can laminate with the face 310 of being connected of shell 300, and then makes the electric arc of the effective separation different phases of flash barrier 200 more, guarantees the power consumption safety.

Specifically, both ends of the first limiting protrusion 2421 in the first direction extend outward to lengthen the length of the first limiting protrusion 2421, and both ends of the second limiting portion on the housing 300 in the first direction also extend outward, so as to increase the contact area between the first limiting protrusion 2421 and the second limiting protrusion, and improve the fixing stability of the nut holding assembly relative to the housing 300.

Further, the limiting plate 250 is provided with extending portions 251 extending along the second direction toward the edge of the arc barrier 200 inserted into the accommodating groove 1221, when the arc barrier 200 is inserted into the accommodating groove 1221, the two extending portions 251 clamp the corresponding insertion arms 122, so as to effectively prevent the arc barrier 200 from shaking relative to the nut holder 100.

Other structures of the nut holding assembly provided in this embodiment are the same as those of the first embodiment, and are not described in detail herein.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements, and substitutions will now occur to those skilled in the art without departing from the scope of the invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A nut holding assembly, comprising:

the nut holder (100) is provided with a plurality of fixing grooves (111) at intervals along a first direction, nuts can be fixed in the fixing grooves (111), the nut holder (100) can be fixed on a shell (300) of the contactor, and the fixing grooves (111) can be in one-to-one correspondence with wiring rows (400) of the contactor;

the arc isolation plate (200) is provided with a plurality of arc isolation plates and can be connected with the nut retaining piece (100), and the arc isolation plates (200) can be respectively arranged between the adjacent wiring bars (400) of the contactor to isolate the wiring bars (400).

2. The nut holding assembly of claim 1 wherein the nut holder (100) comprises:

a plurality of fixing parts (110) are arranged at intervals along the first direction, and each fixing part (110) is provided with a fixing groove (111);

connecting portion (120), be provided with a plurality ofly and set up respectively in adjacent between fixed part (110), be provided with first joint portion (121) on connecting portion (120), first joint portion (121) can with second joint portion (311) joint on shell (300), flash barrier (200) can with connecting portion (120) are connected.

3. The nut holding assembly according to claim 2 characterized in that a plurality of strip-shaped protrusions (112) are provided at intervals in the circumferential direction in the holding groove (111), and a chamfered surface (1121) is provided at an end of the strip-shaped protrusion (112) opened toward the holding groove (111).

4. The nut holding assembly according to claim 2, characterized in that the nut holder (100) is provided with a plurality of positioning protrusions (113) at intervals along a first direction, the positioning protrusions (113) and the first snapping portions (121) are located on the same side of the nut holder (100), and the positioning protrusions (113) can be abutted to the outer shell (300).

5. The nut holding assembly according to claim 2, characterized in that the connecting portion (120) is provided with a receiving groove (1221), and one end of the arc-isolating plate (200) can be inserted into the receiving groove (1221).

6. The nut holding assembly according to claim 5, characterized in that a clamping protrusion (123) is arranged on the inner side surface of the accommodating groove (1221), and a clamping groove (211) which is connected with the clamping protrusion (123) in a matching manner is arranged on the flash barrier (200).

7. The nut holding assembly according to claim 1, characterized in that the housing (300) has a stepped surface (320), a side of the nut holding member (100) facing away from the fixing groove (111) is provided with a support member (114) at an interval in the first direction, the nut holding member (100) can be placed between the stepped surface (320) and the terminal block (400), and an end of the support member (114) abuts against the stepped surface (320), and an end of the fixing groove (111) abuts against the terminal block (400).

8. Nut holding assembly according to claim 1 characterized in that the flash barrier (200) is provided with a third snap-in portion (240), which third snap-in portion (240) can snap in with a fourth snap-in portion (312) on the housing (300).

9. The nut holding assembly according to claim 8, characterized in that the arc barrier (200) comprises two oppositely disposed limiting plates (250), the limiting plates (250) are disposed to extend in a third direction toward a side of the arc barrier (200) where the third catching portion (240) is disposed, and the third catching portion (240) is interposed between the two limiting plates (250).

10. The nut holding assembly according to claim 1, characterized in that a through hole (1111) is provided at a center of a groove bottom of the fixing groove (111), and a detachment hole (1112) is communicated with a circumferential side of the through hole (1111).

11. Nut holding assembly according to any of the claims 1 to 10 characterized in that said flash barrier (200) comprises a baffle (210) and a reinforcement plate (220), said baffle (210) and said reinforcement plate (220) being arranged vertically so that said flash barrier (200) is in the shape of a cross.