CN211701042U

CN211701042U - Intelligence low-voltage switchgear structure

Info

Publication number: CN211701042U
Application number: CN202020681241.8U
Authority: CN
Inventors: 袁贵华
Original assignee: Guangdong Wanye Electric Power Fire Engineering Co ltd
Current assignee: Guangdong Wanye Electric Power Fire Engineering Co ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2020-10-16
Anticipated expiration: 2030-04-28

Abstract

The utility model relates to an intelligence low-voltage switchgear structure, including the cubical switchboard main part, still including setting up in cubical switchboard main part top and being used for supporting the buffering subassembly of cubical switchboard main part and setting up in the dustproof mechanism at cubical switchboard main part top, the both sides at cubical switchboard main part top all are provided with the connecting strip that length direction is parallel to each other, the T-slot that runs through the connecting strip both ends is all seted up to the top surface of two connecting strips, the dustproof mechanism bottom is provided with the T-shaped piece of being connected with the T-slot slides, the length of T-shaped piece is less than the length of T-shaped slot, the position that the T-shaped slot is close to its both ends is provided with. The utility model discloses be provided with at cubical switchboard main part top and dismantle dustproof mechanism, when pushing more dust on dustproof mechanism, dismantle dustproof mechanism to clear up, can prevent that the dust from influencing the surrounding environment.

Description

Intelligence low-voltage switchgear structure

Technical Field

The utility model belongs to the technical field of cubical switchboard equipment, especially, relate to an intelligence low-voltage switchgear structure.

Background

The main effect of cubical switchboard is at the in-process that power generation, transmission of electricity, distribution and electric energy conversion were carried out to electric power system, opens and shuts, control and protection consumer, and the cubical switchboard has a very large variety, and intelligent low-voltage switchgear is exactly one of them, and intelligent low-voltage switchgear structure is applicable to trades such as power plant, oil, chemical industry, metallurgy, weaving, high-rise building.

The current chinese patent that bulletin number is CN208111934U discloses an intelligence low-voltage switchgear, which comprises a display screen, dustproof frame and cubical switchboard main part, the display screen is installed at cubical switchboard main part side end face, display screen inner chamber bottom is equipped with the fixing clip axle, fixing clip axle front end is equipped with presses the seat, it has the panel to inlay to press the seat inner, it is equipped with the fixed plate to press a side end symmetry, connecting slot has been seted up to fixed plate central point, the instrument observation window is installed to display screen upper end position, dustproof frame installs at the display screen side, dustproof frame inner chamber center is equipped with the swash plate, the swash plate side is connected with first hinge and second hinge, the one end of first hinge and second hinge is rotated and is connected with and rotates to support the frame, it has the inserted bar to rotate to support frame central point and insert, the swash plate rear. The utility model discloses an intelligence low-voltage switchgear structure through the setting of dustproof frame, realizes the purpose of dustproof dust reduction.

The above technical solution has the following disadvantages: after the cubical switchboard main part used a period, more dust must be piled up at cubical switchboard main part top, need clear away the dust, when the cubical switchboard main part top was clear away the dust, the dust drifted in the air again easily to influence surrounding environment.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims at providing an intelligence low-voltage switchgear structure sets up the dustproof mechanism that can dismantle the connection at cubical switchboard main part top, when piling up more dust on dustproof mechanism, pulls down dustproof mechanism to clear away the dust, can prevent that the dust from influencing the surrounding environment.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides an intelligence low-voltage switchgear structure, includes the cubical switchboard main part, still including set up in cubical switchboard main part top is used for supporting the buffering subassembly of cubical switchboard main part and set up in the dustproof mechanism at cubical switchboard main part top, the both sides at cubical switchboard main part top all are provided with the connecting strip that length direction is parallel to each other, two the top surface of connecting strip has all been seted up and has been run through the T-slot at connecting strip both ends, dustproof mechanism bottom be provided with the T-shaped piece that the T-slot slides and is connected, the length of T-shaped piece is less than the length of T-slot, the position that the T-slot is close to its both ends is provided with the fastening components who fixes the T-shaped.

Through adopting above-mentioned technical scheme, when dustproof mechanism's top is piled up there is more dust, adjust fastening components, make fastening components not restrict the slip of T-shaped piece, at this moment, promote dustproof mechanism along the length direction level in T-shaped groove, make the T-shaped piece break away from the T-shaped groove, can pull down dustproof mechanism from cubical switchboard main part top to clear up in other places, can avoid direct dust when clearing up at cubical switchboard main part top to fly to aerial and influence the surrounding environment.

The utility model discloses further set up to: fastening component including set up in the connecting strip both ends and with the groove of stepping down of T-slot intercommunication, set up in the connecting strip is kept away from T-slot one side is close to articulated seat, the level at connecting strip both ends rotate in articulated shaft, perpendicular connection in the articulated shaft outside is worn to locate the threaded rod of inslot of stepping down and be located the connecting strip is kept away from one side of articulated seat and with threaded rod threaded connection's fastening nut.

By adopting the technical scheme, when the dustproof mechanism needs to be disassembled, the fastening nut is correspondingly rotated, then the threaded rod is pulled to be separated from the T-shaped groove, and at the moment, the T-shaped block can correspondingly slide; when needs are fixed to the T-shaped piece, pull back the threaded rod in the T-shaped inslot to the rotatory fastening nut that corresponds makes fastening nut tip and connecting strip top butt.

The utility model discloses further set up to: the dustproof mechanism comprises a dustproof plate fixed on the top of the T-shaped block and horizontally arranged and square flanges arranged on the periphery of the top of the dustproof plate, and a plurality of dust collecting openings are formed between the square flanges.

Through adopting above-mentioned technical scheme, the dust collection mouth is used for collecting the dust, and the setting of square flange can avoid the dust in the dust collection mouth to drop.

The utility model discloses further set up to: the dust guard top is provided with and covers two sets of apron of collection dirt mouth, the top of two square flanges that are not adjacent each other is provided with the extension strip, extend the strip edge the length direction of square flange extends the setting, the waist shape hole that runs through its both sides is seted up to extension strip level, waist shape hole is followed the length direction of extension strip extends the setting, the apron is located two extend between the strip, the apron is close to the both ends face average level of extension strip be provided with sliding connection in the downthehole post that slides of waist shape, the post that slides rotate connect in it is downthehole that waist shape is downthehole, the apron with extend and fix through fixed subassembly between the strip.

Through adopting above-mentioned technical scheme, the apron can cover the dust collection mouth, when dustproof mechanism is pulled down to needs, promotes the apron to fix the apron through fixed subassembly, make the apron can cover the dust collection mouth, avoid when carrying dustproof mechanism, the intraoral dust of dust collection is wafted to aerial.

The utility model discloses further set up to: the fixed subassembly including set up in the joint groove at extension both ends and set up in the apron both ends are kept away from the joint post of sliding post one end, the position of joint post with the position in joint groove corresponds, the joint post with joint groove joint cooperation.

Through adopting above-mentioned technical scheme, the level promotes the apron, and when the post that slides when sliding to one of them tip in waist shape hole, the joint post just with joint groove joint to realize the apron and extend the fixed between the strip.

The utility model discloses further set up to: the buffering subassembly including set up in base, the vertical setting in cubical switchboard main part below a plurality of lower telescopic link, vertical setting in side on the base the cubical switchboard main part bottom and slip cap are located last telescopic link and the cover of lower telescopic link upper end are located go up the telescopic link with the same spring in the telescopic link outside down.

Through adopting above-mentioned technical scheme, the setting of spring can make the cubical switchboard main part have certain shock-absorbing capacity in vertical direction.

The utility model discloses further set up to: the supporting seats are vertically arranged at two opposite end portions of the base, the two supporting seats are respectively located on two sides of the switch cabinet main body, limiting blocks are arranged on two opposite side walls of the switch cabinet main body, and limiting grooves which are connected with the limiting blocks in a sliding mode are vertically formed in one side, close to the switch cabinet main body, of the supporting seats.

Through adopting above-mentioned technical scheme, when the cubical switchboard main part rocked a little in vertical direction, the stopper can slide in the spacing groove, plays certain limiting displacement to the cubical switchboard main part to improve the connection stability of cubical switchboard main part and base.

The utility model discloses further set up to: and two end parts of the T-shaped block are provided with avoidance grooves for avoiding the fastening nuts.

Through adopting above-mentioned technical scheme, dodge the setting in groove and can avoid T-shaped piece tip and fastening nut outside contact to rotation fastening nut that can be smooth.

To sum up, the utility model discloses a beneficial technological effect does:

1. when more dust is accumulated on the top of the dustproof mechanism, the fastening assembly is adjusted to enable the fastening assembly not to limit the sliding of the T-shaped block, at the moment, the dustproof mechanism is horizontally pushed along the length direction of the T-shaped groove to enable the T-shaped block to be separated from the T-shaped groove, the dustproof mechanism can be detached from the top of the switch cabinet main body and cleaned in other places, and the situation that the surrounding environment is influenced due to the fact that the dust is scattered into the air when the top of the switch cabinet main body is directly cleaned can be avoided;

2. be provided with the apron that can block the dust collection mouth in the dust guard top, when dustproof mechanism needs to be pulled down, promote the apron, make joint post and joint groove joint, make the apron can cover the dust collection mouth completely, avoid when transport dustproof mechanism, the intraoral dust of dust collection is wafted to aerial.

Drawings

FIG. 1 is a schematic diagram of an intelligent low-voltage switchgear cabinet structure;

FIG. 2 is a schematic diagram of a buffer assembly of an intelligent low voltage switchgear configuration;

FIG. 3 is a schematic view of a switchgear body and dust prevention mechanism of an intelligent low voltage switchgear configuration;

FIG. 4 is an enlarged partial schematic view of portion A of FIG. 3;

fig. 5 is a schematic diagram of a dust-proof mechanism of an intelligent low-voltage switch cabinet structure.

In the figure, 1, a switch cabinet main body; 2. a base; 3. a lower telescopic rod; 4. an upper telescopic rod; 5. a spring; 6. a supporting seat; 7. a limiting block; 8. a limiting groove; 9. a connecting strip; 10. a fixed block; 11. a set screw; 12. a T-shaped slot; 13. a dust-proof plate; 14. a square flange; 15. a T-shaped block; 16. a yielding groove; 17. a hinged seat; 18. hinging a shaft; 19. a threaded rod; 20. fastening a nut; 21. an avoidance groove; 22. a dust collection port; 23. a cover plate; 24. an extension bar; 25. a waist-shaped hole; 26. sliding the column; 27. a clamping column; 28. a clamping groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses an intelligence low-voltage switchgear structure, including buffering subassembly, cubical switchboard main part 1 and dustproof mechanism, cubical switchboard main part 1 sets up in buffering subassembly top, and dustproof mechanism sets up in 1 tops of cubical switchboard main part.

Referring to fig. 2, the buffer assembly comprises a square base 2, four lower telescopic rods 3, four upper telescopic rods 4 and four springs 5, the lower telescopic rods 3 are fixed on the upper end surface of the base 2, the four lower telescopic rods 3 are arranged at the positions of the upper end surface of the base 2 close to the four corners of the base, the upper telescopic rods 4 are fixed at the bottom of the switch cabinet main body 1, the positions of the upper telescopic rods 4 correspond to the positions of the lower telescopic rods 3, the upper telescopic rods 4 are of a hollow structure, the end parts of the upper telescopic rods 4 far away from the switch cabinet main body 1 are arranged in an opening manner, the upper end parts of the lower telescopic rods 3 are slidably arranged in the upper telescopic rods 4, the upper telescopic rods 4 are overlapped with the axes of the lower telescopic rods 3 at the corresponding positions, the springs 5 are positioned between the base 2 and the switch cabinet main body 1, the springs 5 are respectively vertically sleeved on the outer sides of the upper telescopic rods 4 and the lower telescopic rods 3 at the corresponding positions, and two ends of, the arrangement of the spring 5 can play a certain buffering role on the switch cabinet main body 1.

In order to improve the connection stability between cubical switchboard main part 1 and the base 2, the equal vertical supporting seat 6 that is fixed with in base 2 both ends, two supporting seats 6 are located the relative both sides of cubical switchboard main part 1 respectively, two sides that cubical switchboard main part 1 is close to supporting seat 6 all are fixed with stopper 7 that the position is the same, supporting seat 6 is close to the equal vertical spacing groove 8 of having seted up in side of cubical switchboard main part 1, stopper 7 sliding connection is in spacing groove 8, stopper 7 can slide along the length direction of spacing groove 8.

Referring to fig. 3 and 4, 1 top of cubical switchboard main part is provided with two sets of connecting strips 9, two sets of connecting strips 9 are located 1 top of cubical switchboard main part respectively and are close to the both sides at its edge, the length direction of two sets of connecting strips 9 is parallel to each other, 9 bottom fixedly connected with of two sets of connecting strips fall the fixed block 10 of T font, fixed block 10 is fixed in 1 top of cubical switchboard main part through set screw 11, fixed block 10 extends the setting along the length direction of connecting strip 9, and the length of fixed block 10 slightly is less than the length of connecting strip 9. T-shaped grooves 12 are formed in the top surfaces of the two groups of connecting strips 9, the vertical sections of the T-shaped grooves 12 are in an inverted T shape, and the T-shaped grooves 12 extend along the length direction of the connecting strips 9 and penetrate through the two opposite end portions of the connecting strips 9. Dustproof mechanism includes dust guard 13, and dust guard 13 is located cubical switchboard main part 1 top. Two sets of T-shaped blocks 15 are fixed at the bottom of the dustproof plate 13, the two sets of T-shaped blocks 15 are respectively positioned at the bottom of the dustproof plate 13 and close to the two sides of the edge of the dustproof plate, the length directions of the two sets of T-shaped blocks 15 are parallel to each other, the positions of the T-shaped blocks 15 correspond to the positions of the T-shaped grooves 12, the horizontal distance between the two sets of T-shaped blocks 15 is the same as the horizontal distance between the two sets of connecting strips 9, the vertical section of each T-shaped block 15 is in an inverted T shape, the length of each T-shaped block 15 is slightly smaller than that of.

The two ends of the connecting strip 9 are provided with fastening components, and the T-shaped block 15 is fixed by setting two groups of fastening components, so that the dustproof mechanism is fixedly connected. The fastening component comprises an abdicating groove 16, a hinging seat 17, a hinging shaft 18, a threaded rod 19 and a fastening nut 20, the abdicating groove 16 is arranged at the bottom of the connecting strip 9 and close to the two end parts of the connecting strip, the abdicating groove 16 is communicated with the T-shaped groove 12, the hinging seat 17 is fixed at the bottom of the connecting strip 9 and close to the two end parts of the connecting strip, the hinging shaft 18 is positioned under the abdicating groove 16, the hinging shaft 18 is rotatably connected in the hinging seat 17, the axis of the hinging shaft 18 is vertical to the length direction of the connecting strip 9, the threaded rod 19 is vertically fixed at the middle part of the outer side of the hinging shaft 18, the diameter of the threaded rod 19 is smaller than the distance between the two opposite side walls of the abdicating groove 16, the length of the; and when the threaded rod 19 is rotated and the threaded rod 19 is vertically arranged, the upper end of the threaded rod 19 extends out of the top of the connecting strip 9, and the fastening nut 20 is in threaded connection with the outer side of the threaded rod 19. The positions of the two ends of the T-shaped block 15, which are close to the dust-proof plate 13, are provided with avoiding grooves 21, and when the threaded rod 19 is rotated to be in a vertical state, the fastening nut 20 is just positioned in the avoiding grooves 21.

When the dustproof mechanism needs to be disassembled, the fastening nut 20 is correspondingly rotated, then the threaded rod 19 is pulled, the threaded rod 19 is separated from the T-shaped groove 12, and at the moment, the T-shaped block 15 can correspondingly slide, so that the dustproof mechanism can be disassembled; when the dustproof mechanism needs to be fixed, the threaded rod 19 is pulled to be in a vertical state, the fastening nut 20 is correspondingly screwed, the end part of the fastening nut 20 is abutted against the top of the connecting strip 9, and at the moment, the fastening nut 20 is located in the avoiding groove 21, so that the T-shaped block 15 is fixed.

Referring to fig. 5, the dust-proof mechanism further includes four sets of square flanges 14, the four sets of square flanges 14 are respectively vertically fixed at positions on the top surface of the dust-proof plate 13 near the edges thereof, the two adjacent sets of square flanges 14 are mutually perpendicular and fixedly connected, the heights of the four sets of square flanges 14 are the same, and a square dust collection opening 22 is formed between the four sets of square flanges 14, and the dust collection opening 22 enables dust to be accumulated on the dust-proof plate 13. The top of the dust-proof plate 13 is provided with two groups of cover plates 23, and after the two groups of cover plates 23 are covered, the dust-proof plate can block the dust collecting opening 22, so that the dust in the dust collecting opening 22 can be prevented from floating in the air when the dust-proof mechanism is carried.

In order to facilitate the installation of the cover plate 23, the top of each of the two sets of square flanges 14 which are not adjacent to each other and have a long length is fixed with an elongated extension strip 24, the extension strips 24 extend along the length direction of the square flange 14 connected with the extension strips 24, the length of the extension strips 24 is greater than that of the square flange 14 connected with the extension strips, and two ends of the extension strips 24 extend out of two sides of the square flange 14. Waist-shaped hole 25 has been seted up to extension strip 24 level, and waist-shaped hole 25 runs through the inside and outside both sides of extension strip 24, and waist-shaped hole 25 extends the setting along the length direction of extension strip 24, and the length in waist-shaped hole 25 is greater than the length of the square flange 14 that is connected with extension strip 24. Two sets of apron 23 all are located between two sets of extension strips 24, and apron 23 both ends laminate with the face in opposite directions of two sets of extension strips 24 respectively, and the both ends of apron 23 and the laminating of extension strip 24 are equal the level and are fixed with columniform post 26 that slides, and post 26 sliding connection slides in waist shape hole 25, and the diameter of post 26 that slides slightly is less than the distance between the relative both sides wall in waist shape hole 25, and the post 26 that slides can rotate in waist shape hole 25. When the sliding columns 26 of the two sets of cover plates 23 slide to the ends of the waist-shaped holes 25, the two sets of cover plates 23 are in a vertical state.

In order to fix the cover plate 23 and the extension bar 24, a fixing component is arranged between the cover plate 23 and the extension bar 24, and the fixing component can fix the cover plate 23. Fixed subassembly includes joint post 27 and joint groove 28, and joint post 27 is fixed in the apron 23 and is connected with the tip that slides post 26, and joint post 27 is located the one end that slides post 26 is kept away from to this tip, and the axis of joint post 27 is parallel with the axis of sliding post 26, and joint groove 28 is seted up in the both ends that the connecting strip 9 is relative, and the shape of joint groove 28 agrees with mutually with the shape of joint post 27, and joint post 27 and the cooperation of joint groove 28 joint. When dustproof mechanism is pulled down to needs, rotate the apron 23 of vertical state, make apron 23 be the horizontality, then the level promotes two sets of apron 23, makes two sets of apron 23 be close to each other, and when two sets of apron 23 terminal surfaces in opposite directions laminated each other, joint post 27 just with joint groove 28 joint to realize the apron 23 and extend the fixed between the strip 24. When the cover plate 23 is not used, the cover plate 23 is rotated to be in a vertical state, so that dust can be prevented from being accumulated on the surface of the cover plate 23.

The implementation principle of the embodiment is as follows: the dustproof mechanism is arranged at the top of the switch cabinet main body 1, so that dust cannot be accumulated at the top of the switch cabinet main body 1 but at the dust collection port 22, when more dust is accumulated in the dust collection port 22, the cover plate 23 in a vertical state is rotated, the cover plate 23 is rotated to a horizontal state, and the two groups of cover plates 23 are horizontally pushed, so that the two groups of cover plates 23 are close to each other, when the opposite end surfaces of the two groups of cover plates 23 are mutually attached, the two groups of cover plates 23 cover the dust collection port 22, and at the moment, the clamping columns 27 are clamped with the clamping grooves 28, so that the cover plates 23 are fixed; corresponding loosening fastening nut 20 to pull threaded rod 19, make threaded rod 19 break away from T-slot 12, then along the length direction level promotion dustproof mechanism of T-slot 12, and shift dustproof mechanism wholly to other places and clear up, clear up the completion back, install the corresponding position at dustproof mechanism return switch cabinet main part 1 top.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. An intelligent low-voltage switch cabinet structure comprises a switch cabinet main body (1); the method is characterized in that: still including set up in cubical switchboard main part (1) top is used for supporting the buffering subassembly of cubical switchboard main part (1) and set up in the dustproof mechanism at cubical switchboard main part (1) top, the both sides at cubical switchboard main part (1) top all are provided with connecting strip (9) that length direction is parallel to each other, two the top surface of connecting strip (9) has all been seted up and has been run through T-slot (12) at connecting strip (9) both ends, dustproof mechanism bottom be provided with T-shaped piece (15) that T-slot (12) slided and are connected, the length of T-shaped piece (15) is less than the length of T-shaped slot (12), the position that T-shaped slot (12) are close to its both ends is provided with the fastening components who fixes T-shaped piece (15).

2. An intelligent low-voltage switchgear structure according to claim 1, characterized in that: fastening component is including seting up in connecting strip (9) both ends and with groove (16) of stepping down of T-slot (12) intercommunication, set up in connecting strip (9) are kept away from T-slot (12) one side is close to articulated seat (17), the level at connecting strip (9) both ends rotate in articulated shaft (18), perpendicular connect in articulated shaft (18) outside is worn to locate threaded rod (19) in groove (16) of stepping down and be located connecting strip (9) are kept away from one side of articulated seat (17) and with threaded rod (19) threaded connection's fastening nut (20).

3. An intelligent low-voltage switchgear structure according to claim 1, characterized in that: the dustproof mechanism comprises a dustproof plate (13) which is fixed on the top of the T-shaped block (15) and is horizontally arranged and square flanges (14) which are arranged on the periphery of the top of the dustproof plate (13), and a dust collection opening (22) is formed between the square flanges (14).

4. An intelligent low-voltage switchgear structure according to claim 3, characterized in that: two groups of cover plates (23) capable of covering the dust collecting opening (22) are arranged at the top of the dust-proof plate (13), extending strips (24) are arranged at the tops of two square flanges (14) which are not adjacent to each other, the extension strip (24) is arranged along the length direction of the square flange (14) in an extending way, the extension strip (24) is horizontally provided with a waist-shaped hole (25) which penetrates through two sides of the extension strip, the waist-shaped hole (25) is arranged in an extending way along the length direction of the extension strip (24), the cover plate (23) is positioned between the two extension bars (24), two end faces of the cover plate (23) close to the extension bars (24) are horizontally provided with sliding columns (26) which are connected in the kidney-shaped holes (25) in a sliding manner, the sliding column (26) is rotatably connected in the waist-shaped hole (25), and the cover plate (23) and the extension strip (24) are fixed through a fixing component.

5. An intelligent low-voltage switchgear structure according to claim 4, characterized in that: fixed subassembly including set up in joint groove (28) at extension strip (24) both ends and set up in apron (23) both ends are kept away from joint post (27) of sliding column (26) one end, the position of joint post (27) with the position in joint groove (28) corresponds, joint post (27) with joint groove (28) joint cooperation.

6. An intelligent low-voltage switchgear structure according to claim 1, characterized in that: buffering subassembly including set up in base (2), vertical set up in cubical switchboard main part (1) below a plurality of lower telescopic link (3), vertical set up in side are gone up in base (2) the cubical switchboard main part (1) bottom and slip cap are located last telescopic link (4) and the cover of telescopic link (3) upper end are located down go up telescopic link (4) with same spring (5) in the telescopic link (3) outside down.

7. An intelligent low-voltage switchgear structure according to claim 6, characterized in that: the two opposite end portions of the base (2) are vertically provided with supporting seats (6), the supporting seats (6) are respectively located on two sides of the switch cabinet main body (1), limiting blocks (7) are arranged on two opposite side walls of the switch cabinet main body (1), and the supporting seats (6) are close to one side of the switch cabinet main body (1) and are vertically provided with limiting grooves (8) which are connected with the limiting blocks (7) in a sliding mode.

8. An intelligent low-voltage switchgear structure according to claim 2, characterized in that: and two end parts of the T-shaped block (15) are provided with avoidance grooves (21) for avoiding the fastening nuts (20).