Fault-tolerant adjustable non-loosening fastening device

Abstract

The utility model discloses a fault-tolerant adjustable captive fastening device which comprises a pressing strip, a floating screw sleeve and a captive screw. The pressing strip is provided with a U-shaped groove, the two sides of the U-shaped groove are planes, and the pressing strip is attached to the back face of the subrack cover plate through the planes and is fastened to the subrack cover plate. The floating threaded sleeve is arranged in the U-shaped groove of the pressing strip, and a gap is reserved between the floating threaded sleeve and the pressing strip. A pressing rivet nut is riveted on a mounting panel of the equipment; a mounting panel of the equipment is attached to the front surface of the subrack cover plate; and the threaded section of the captive screw is screwed into the pressing rivet nut, passes through the mounting panel of the equipment and the subrack cover plate, and is in threaded engagement with the floating screw sleeve, so that the connection between the equipment and the subrack cover plate is realized. According to the utility model, the position of the captive screw can be adjusted in a fault-tolerant manner, and rapid positioning and fastening of equipment are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of connection and fastening of equipment in a cabinet or a plug-in box, and in particular to a fault-tolerant adjustable non-loose fastening device. Background Art

[0002] At present, most of the equipment in the cabinet or plug-in box is pushed in through the guide rails on both sides and fixed by the captive screws on the cabinet or plug-in box panel. There are certain processing and assembly errors in the guide rail connecting plate and the panel holes. It is also difficult for the mounting axis of the captive screw to be completely perpendicular to the panel. When manual alignment and improper operation are performed, it is very easy to cause damage to the screws or thread stripping of the mounting hole. The structure is poorly maintainable and there is a risk of loosening and failure. The captive fixing method with springs can reduce the probability of thread damage, but the installation tolerance is small, and the fault tolerance and interchangeability are poor. Utility Model Content

[0003] The utility model aims to provide a fault-tolerant adjustable captive fastening device to solve the problems of easy damage of captive screws and poor structural maintenance and interchangeability during installation of equipment in a cabinet or a plug-in box.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a fault-tolerant adjustable non-loose fastening device for fastening a device to a plug-in box cover, the fault-tolerant adjustable non-loose fastening device comprising a pressure strip, a floating nut and a captive screw; the pressure strip is provided with a U-shaped groove, the two sides of the U-shaped groove are planes, the pressure strip is fitted to the back of the plug-in box cover through the plane and is fastened to the plug-in box cover; the floating nut is placed in the U-shaped groove of the pressure strip, and a gap is left between the pressure strip and the pressure strip; a rivet nut is riveted on the installation panel of the device; the installation panel of the device is fitted to the front of the plug-in box cover; after the threaded section of the captive screw is screwed into the rivet nut, it passes through the installation panel of the device and the plug-in box cover, and engages with the thread of the floating nut to achieve the connection between the device and the plug-in box cover.

[0005] The above-mentioned fault-tolerant adjustable loose-fitting fastening device, wherein a through hole is opened at the end of the U-shaped groove, the head of the floating screw sleeve is placed in the through hole, the outer diameter of the head of the floating screw sleeve is less than the aperture of the through hole; the floating screw sleeve can only be fine-tuned up, down, left and right in the U-shaped groove, and cannot rotate 360°.

[0006] The above-mentioned fault-tolerant adjustable non-loose fastening device, wherein the plane of the pressure strip is provided with a mounting hole, which is connected to the plug-in box cover plate by a combination of countersunk screws.

[0007] The above-mentioned fault-tolerant adjustable captive fastening device, wherein the captive screw includes a head, a middle part and a threaded section connected in sequence, and the threaded section is provided with an external thread; the floating screw sleeve has a threaded through hole, and the threaded section of the captive screw engages with the threaded through hole of the floating screw sleeve.

[0008] The above-mentioned fault-tolerant adjustable non-loose fastening device, wherein the head is provided with a knurled pattern and a slotted groove, which is non-slip and easy to operate, and can be screwed in manually or using a slotted screwdriver; the edge of one end of the threaded section that is not connected to the middle part is in an arc shape.

[0009] The above-mentioned fault-tolerant adjustable non-loose fastening device, wherein the outer diameter of the middle portion is less than the aperture diameter of the equipment installation hole on the plug-in box cover plate, and the outer diameter of the middle portion is less than the aperture diameter of the non-threaded section of the rivet nut, so as to realize the circumferential adjustment function after the non-loose screw is screwed in.

[0010] The above-mentioned fault-tolerant adjustable loose-fitting fastening device, wherein the equipment is fastened to the plug-in box cover plate by four sets of the fault-tolerant adjustable loose-fitting fastening devices, and the two sets of the fault-tolerant adjustable loose-fitting fastening devices on the same side share a pressure strip, which is provided with two U-shaped grooves.

[0011] The above-mentioned fault-tolerant adjustable non-loose fastening device, wherein the pressure strip and the non-loose screws are both made of stainless steel to improve the corrosion resistance of the structure under multiple working conditions; the floating thread sleeve is made of carbon steel, and the surface is galvanized or Dacromet-treated to reduce the probability of biting of the threaded part.

[0012] Compared with the prior art, the beneficial technical effects of the utility model are:

[0013] The fault-tolerant and adjustable captive fastening device of the utility model solves the problems that captive screws are easily damaged and the structural maintenance and interchangeability are poor during the installation of equipment in a cabinet or a plug-in box; the position of the captive screws can be fault-tolerantly adjusted, thereby realizing rapid positioning and fastening during the equipment installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The fault-tolerant adjustable non-loose fastening device of the utility model is provided by the following embodiments and drawings.

[0015] Figure 1 It is a schematic diagram of a fault-tolerant adjustable non-loose fastening device according to an embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of riveting rivet nuts on the mounting panel of the device in the embodiment of the utility model.

[0017] Figure 3 It is a schematic diagram of the connection between the pressure strip and the plug-in box cover in the embodiment of the utility model.

[0018] Figure 4 It is a schematic diagram of the non-loose fastening structure of the single-sided common pressure strip in the embodiment of the utility model. DETAILED DESCRIPTION

[0019] The following will be combined Figure 1 to Figure 4The fault-tolerant adjustable non-loose fastening device of the utility model is further described in detail.

[0020] See also Figures 1 to 4 In this embodiment, four device installation holes are provided on the plug-in box cover 13, and four plug-in box installation holes are provided on the device installation panel 12. During installation, the device installation panel 12 is attached to the front of the plug-in box cover 13, and the four plug-in box installation holes are respectively connected to the four device installation holes. Four sets of fault-tolerant adjustable loose-fitting fastening devices are used to fasten the device to the plug-in box cover 13.

[0021] The fault-tolerant adjustable non-loose fastening device comprises a pressure strip 15, a floating screw sleeve 14 and a non-loose screw 11; the pressure strip 15 is provided with a U-shaped groove, the two sides of the U-shaped groove are planes, the pressure strip 15 is attached to the back of the plug-in box cover 13 through the plane and is fastened to the plug-in box cover 13; the floating screw sleeve 14 is placed in the U-shaped groove of the pressure strip 15, and a gap is left between the pressure strip 15; the plug-in box installation hole of the installation panel 12 of the equipment is riveted with a rivet nut 121, such as Figure 2 The installation panel 12 of the device is attached to the front of the plug box cover 13; after the threaded section 113 of the captive screw 11 is screwed into the rivet nut 121, it passes through the installation panel and plug box cover of the device, and engages with the thread of the floating screw sleeve 14 to realize the connection between the device and the plug box cover 13.

[0022] The captive screw 11 comprises a head, a middle part 112 and a threaded section 113 connected in sequence, wherein the head is provided with a knurling pattern and a slot 111; the threaded section 113 has an end not connected to the middle part, and its edge 114 is in an arc shape.

[0023] The installation steps are as follows:

[0024] Before installing the equipment, rivet the rivet nut 121 to the plug-in box installation hole of the installation panel 12 of the equipment. Figure 2 .

[0025] Before installing the equipment, place the floating screw sleeve 14 in the U-shaped groove of the pressure strip 15, and place the head of the floating screw sleeve 14 in the through hole of the pressure strip U-shaped groove, so that the floating screw sleeve 14 can only be fine-tuned up, down, left and right, and cannot be rotated; the contact part between the floating screw sleeve 14 and the pressure strip 15 has a rounded transition to relieve stress; the adjustable distance of the floating screw sleeve 14 in the pressure strip U-shaped groove up, down, left and right is maintained at 0.5mm~1mm, and the single-side adjustable clearance of the head of the floating screw sleeve 14 in the through hole of the U-shaped groove is 0.5~1.5mm;

[0026] Place the pressure strip 15 and the floating screw sleeve 14 on the back of the plug-in box cover 13, and align the mounting hole 151 on the pressure strip 15 with the mounting hole 131 on the plug-in box cover 13. Figure 3Then, the pressure strip 15 is fastened to the plug-in box cover 13 with a countersunk screw assembly 16 (including a spring washer, a flat washer, and a hexagonal nut), and the end surface of the countersunk screw does not protrude from the surface of the plug-in box cover 13;

[0027] For the two device installation holes on the same side of the plug-in box cover 13, a pressure strip can be selected, and the pressure strip is provided with two U-shaped grooves, and the distance between the two U-shaped grooves is equal to the distance between the two device installation holes on the same side, such as Figure 4 As shown; a separate pressure strip can also be used for each device installation hole, that is, the pressure strip is not shared;

[0028] Place the guide rails on both sides of the device in the guide rails inside the plugbox or cabinet, and push them in manually to make the installation panel 12 of the device fit with the plugbox cover 13, and the four installation holes of the two are coaxial. Manually screw the captive screw 11 into the rivet nut 121, pass through the installation panel and plugbox cover of the device, and fine-tune the captive screw 11 up, down, left and right. Under the guidance of the rounded transition at the tail of the captive screw 11, the external thread on the threaded section 113 of the captive screw 11 gradually engages with the internal thread of the floating screw sleeve. When the axes of the holes and the captive screw 11 are consistent, screw the captive screw 11 to the bottom to completely fix the equipment.

[0029] The above implementation cases and drawings are only used to illustrate the technical solution of the utility model, rather than to limit it. Those skilled in the art may make appropriate modifications or replace some of the technical features with equivalents, and these modifications or replacements are within the scope defined by the attached claims.

Claims

1. A fault-tolerant adjustable non-loose fastening device, used to fasten the device to the plug-in box cover, characterized in that: The fault-tolerant adjustable non-loose fastening device includes a pressure strip, a floating nut and a captive screw; the pressure strip is provided with a U-shaped groove, and the two sides of the U-shaped groove are flat, and the pressure strip is attached to the back of the plug-in box cover through the flat surface and is fastened to the plug-in box cover; the floating nut is placed in the U-shaped groove of the pressure strip, and a gap is left between the pressure strip and the pressure strip; a rivet nut is riveted on the installation panel of the equipment; the installation panel of the equipment is attached to the front of the plug-in box cover; after the threaded section of the captive screw is screwed into the rivet nut, it passes through the installation panel of the equipment and the plug-in box cover, and engages with the thread of the floating nut to achieve the connection between the equipment and the plug-in box cover.

2. The fault-tolerant adjustable non-loose fastening device according to claim 1, characterized in that: A through hole is provided at the end of the U-shaped groove, and the head of the floating screw sleeve is placed in the through hole. The outer diameter of the head of the floating screw sleeve is less than the aperture of the through hole. The floating screw sleeve can only be fine-tuned up, down, left and right in the U-shaped groove and cannot rotate 360°.

3. The fault-tolerant adjustable non-loose fastening device according to claim 1, characterized in that: The plane of the pressure strip is provided with a mounting hole, which is connected to the plug-in box cover plate by a combination of countersunk screws.

4. The fault-tolerant adjustable non-loose fastening device according to claim 1, characterized in that: The captive screw comprises a head, a middle part and a threaded section which are connected in sequence, and the threaded section is provided with an external thread; the floating screw sleeve is provided with a threaded through hole, and the threaded section of the captive screw is engaged with the threaded through hole of the floating screw sleeve.

5. The fault-tolerant adjustable non-loose fastening device according to claim 4, characterized in that: The head is provided with a knurled pattern and a straight groove; the edge of one end of the threaded section not connected to the middle part is in an arc shape.

6. The fault-tolerant adjustable non-loose fastening device according to claim 4, characterized in that: The outer diameter of the middle portion is less than the diameter of the equipment installation hole on the plug-in box cover, and the outer diameter of the middle portion is less than the diameter of the non-threaded section of the rivet nut.

7. The fault-tolerant adjustable non-loose fastening device according to claim 1, characterized in that: The equipment is fastened to the plug box cover plate by four sets of the fault-tolerant adjustable loose-fitting fastening devices, and two sets of the fault-tolerant adjustable loose-fitting fastening devices on the same side share a pressure strip, which is provided with two U-shaped grooves.

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