Self-locking bolt and nut assembly

Abstract

The invention discloses a self-locking bolt and nut assembly which comprises a bolt, a nut and a detection mechanism, the bolt and the nut can be in threaded connection and jointly clamp a to-be-fixed part, the detection mechanism comprises a lower substrate, a wire, a detector, a fixed contact and a movable contact, the fixed contact is arranged in the lower substrate and can be installed between the to-be-fixed part and the nut, and the wire is connected with the detector. The movable contact is installed on the nut and can be in contact connection with the fixed contact when the nut is screwed down, the fixed contact and the movable contact are connected into the detector through wires, and the detector can judge whether the fixed contact and the movable contact are in contact connection or not according to whether the energizing loop is kept conducted or not. Whether the nut is loosened or not can be monitored in the first time, the work overhaul frequency of workers can be effectively reduced, and the labor cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of fasteners, in particular to the technical field of bolts and nuts. Background Art

[0002] Nuts and bolts are a widely used type of fixing parts. When nuts and bolts are used together to fix mechanical parts, the nuts are prone to loosening or falling off after a period of use due to the movement or vibration of the mechanical parts, causing the fixed parts to shift or loosen (which may cause damage to the mechanical parts at the very least, or even cause safety accidents at worst).

[0003] In order to solve the problem of nut loosening, people have designed many anti-loosening designs according to different application conditions and environments, such as using pins to reinforce the position of nuts (such as the anti-loosening bolt nut with publication number CN112032178A), using elastic rings to limit the rotation of nuts (such as the anti-loosening nut with publication number CN105422601A), and making double nuts stop rotating against each other (such as a double-nut anti-loosening bolt with publication number CN104196864A); however, such fasteners can only prevent nuts from loosening as much as possible, but cannot monitor whether the nuts are loose; workers still need to regularly perform manual inspections on some mechanical equipment with more intense vibration loads and take measures such as re-tightening nuts with loose connections, which is labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a self-loosening-proof bolt and nut assembly, which can not only monitor whether the nut is loose at the first time, but also effectively reduce the frequency of workers' work and maintenance, saving labor costs.

[0005] To achieve the above-mentioned purpose, the present invention proposes a self-loosening bolt and nut assembly, including a bolt, a nut and a detection mechanism. The bolt and the nut can be threadedly connected to each other and jointly clamp the part to be fixed. The detection mechanism includes a lower base plate, a wire, a detector, a fixed contact and a moving contact. The lower base plate has a fixed contact and can be installed between the part to be fixed and the nut. The moving contact is installed on the nut and can contact the fixed contact when the nut is tightened. The fixed contact and the moving contact are respectively connected to the detector through the wire. The detector can judge whether the fixed contact and the moving contact remain in contact by whether the power-on circuit remains conductive.

[0006] Preferably, the screw rod of the bolt can pass through the lower base plate along the lower through hole, and an annular lower blind groove is provided on the bottom surface of the lower base plate and located at the periphery of the lower through hole, and a mother flange portion is provided on the top surface of the nut and located at the outer edge, and an annular mother flange portion is provided on the mother flange portion and can extend into the annular lower blind groove, and the fixed contact and the moving contact are respectively installed on the annular lower blind groove and the annular mother flange.

[0007] Preferably, the fixed contact and the movable contact are respectively covered with spacers, one end of the wire is electrically connected to the detector and the other end is electrically connected to the fixed contact after passing through the lower substrate and the spacer or is electrically connected to the movable contact after passing through the nut and the spacer.

[0008] Preferably, the lower base plate is provided with a plate body wire barrel at a position where the wire is inserted, and the nut is provided with a mother body wire barrel at a position where the wire is inserted.

[0009] Preferably, a mesh texture is provided on the side of the lower substrate facing the part to be fixed.

[0010] Preferably, an elastic anti-loosening mechanism is further included, wherein the elastic anti-loosening mechanism is arranged between the bolt and the detection mechanism and can provide a rebound force to the bolt axially away from the nut when the nut is tightened.

[0011] Preferably, the elastic anti-loosening mechanism includes an upper base plate, a spring and a top pressure sleeve, the screw rod of the bolt can pass through the upper base plate along the upper through hole, the top surface of the upper base plate and the outer periphery of the upper through hole are provided with an annular upper blind groove, the bottom surface of the bolt head and the outer edge are provided with a head body flange, the head body flange is provided with a column that can extend into the annular upper blind groove, the spring sleeve is arranged outside the column and has an elastic tendency to push the top pressure sleeve away from the head body flange when the nut is tightened.

[0012] Preferably, two ends of the spring are respectively fixed to the head body flange and the top pressure sleeve, and the top pressure sleeve is arranged outside the plug column.

[0013] Beneficial effects of the present invention: 1) When the bolt and nut clamp the part to be fixed together, a detection mechanism consisting of a lower substrate, a wire, a detector, a fixed contact and a moving contact is installed between the nut and the part to be fixed. The detector can be used to monitor in real time whether the power circuit remains conductive to determine whether the fixed contact and the moving contact remain in contact. This can not only detect whether the nut is loose at the first time, but also effectively reduce the frequency of workers' outings for inspection and maintenance, saving labor costs; 2) By adding a mesh texture on the side of the lower substrate facing the part to be fixed, it is convenient for the lower substrate to accumulate more glue, thereby improving the connection stability between the lower substrate and the part to be fixed; 3) When the bolt and nut jointly clamp the part to be fixed, an elastic anti-loosening mechanism consisting of an upper base plate, a spring and a top pressure sleeve is installed between the screw head of the bolt and the part to be fixed. When the spring is squeezed, the rebound force generated by the spring can be used to force the threads between the bolt and the nut to bite more tightly and effectively prevent the nut from loosening.

[0014] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the assembly of the self-loosening-proof bolt and nut assembly of the present invention; Figure 2 yes Figure 1 Cross-sectional view when the detector is removed; Figure 3 yes Figure 2 An enlarged schematic diagram of point A; Figure 4 yes Figure 2 An enlarged schematic diagram of point B.

[0016] In the figure: 1-bolt, 11-head flange, 12-insert column, 2-nut, 21-parent flange, 22-annular parent flange, 23-parent wire barrel, 3-detection mechanism, 31-lower base plate, 311-annular lower blind groove, 312-plate wire barrel, 32-wire, 33-detector, 34-fixed contact, 35-moving contact, 36-spacer, 4-elastic anti-loosening mechanism, 41-upper base plate, 411-annular upper blind groove, 42-spring, 43-top pressure sleeve, 5-first plate to be fixed, 6-second plate to be fixed. DETAILED DESCRIPTION

[0017] See also Figures 1 to 4 The self-loosening-proof bolt and nut assembly of the present invention comprises a bolt 1, a nut 2 and a detection mechanism 3. The bolt 1 and the nut 2 can be threadedly connected and clamp the part to be fixed together. The detection mechanism 3 comprises a lower base plate 31, a wire 32, a detector 33, a fixed contact 34 and a moving contact 35. The lower base plate 31 has a fixed contact 34 and can be installed between the part to be fixed and the nut 2. The moving contact 35 is installed on the nut 2 and can contact with the fixed contact 34 when the nut 2 is tightened. The fixed contact 34 and the moving contact 35 are respectively connected to the detector 33 through the wire 32. The detector 33 can judge whether the fixed contact 34 and the moving contact 35 are in contact by whether the power-on circuit remains conductive.

[0018] The screw rod of the bolt 1 can pass through the lower base plate 31 along the lower through hole. The bottom surface of the lower base plate 31 is provided with an annular lower blind groove 311 at the periphery of the lower through hole. The top surface of the nut 2 is provided with a mother flange portion 21 at the outer edge. The mother flange portion 21 is provided with an annular mother flange 22 that can extend into the annular lower blind groove 311. The fixed contact 34 and the moving contact 35 are respectively installed at the annular lower blind groove 311 and the annular mother flange 22.

[0019] The fixed contact 34 and the movable contact 35 are respectively provided with a spacer 36, one end of the wire 32 is electrically connected to the detector 33, and the other end is electrically connected to the fixed contact 34 after passing through the lower substrate 31 and the spacer 36, or is electrically connected to the movable contact 35 after passing through the nut 2 and the spacer 36.

[0020] The lower base plate 31 is provided with a plate body wire barrel 312 at a position where the wire 32 is inserted, and the nut 2 is provided with a mother body wire barrel 23 at a position where the wire 32 is inserted.

[0021] The lower substrate 31 has a mesh texture on one side facing the part to be fixed.

[0022] It also includes an elastic anti-loosening mechanism 4, which is arranged between the bolt 1 and the detection mechanism 3 and can provide a rebound force to the bolt 3 away from the nut 2 along the axial direction when the nut 2 is tightened.

[0023] The elastic anti-loosening mechanism 4 includes an upper base plate 41, a spring 42 and a top pressure sleeve 43. The screw rod of the bolt 1 can pass through the upper base plate 41 along the upper through hole. The top surface of the upper base plate 41 and the outer periphery of the upper through hole are provided with an annular upper blind groove 411. The bottom surface of the screw head of the bolt 1 and the outer edge are provided with a head body flange portion 11. The head body flange portion 11 is provided with a column 12 that can extend into the annular upper blind groove 411. The spring 42 is sleeved outside the column 12 and has an elastic tendency to push the top pressure sleeve 43 away from the head body flange portion 11 when the nut 2 is tightened.

[0024] The two ends of the spring 42 are respectively fixed to the head body flange 11 and the top pressing sleeve 43 , and the top pressing sleeve 43 is sleeved outside the plug post 12 .

[0025] Working process of the present invention: Taking the first plate to be fixed 5 and the second plate to be fixed 6 as the connected parts, the lower base plate 31 is first fixed to the bottom surface of the second plate to be fixed 6 by gluing or the like; then, the screw rod of the bolt 1 is passed downward through the upper base plate 41, the first plate to be fixed 5, the second plate to be fixed 6 and the lower base plate 31 in turn, and then the nut 2 is screwed in until the upper base plate 41, the first plate to be fixed 5, the second plate to be fixed 6 and the lower base plate 31 are clamped between the screw head of the bolt 1 and the nut 2.

[0026] When the nut 2 is kept tightened, the annular mother body flange 22 will extend into the annular lower blind groove 311 and make the moving contact 35 contact the fixed contact 34, thereby forming a circuit using the wire 32, the moving contact 35, the fixed contact 34 and the detector 33; that is, if the nut 2 is kept tightened (the moving contact 35 and the fixed contact 34 are in contact), the circuit is unobstructed; if the nut 2 is loosened downward (the moving contact 35 and the fixed contact 34 are separated), the circuit is disconnected.

[0027] In addition, during the process of tightening the nut 2, the plug 123 will simultaneously extend into the annular upper blind groove 411 and compress the spring 42, and the spring 42 will provide a rebound force along the length direction of the bolt 1 to make the thread engagement between the bolt 1 and the nut 2 tighter, thereby preventing the nut 2 from loosening.

[0028] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. Self-loosening bolt and nut assembly, characterized by: The invention comprises a bolt (1), a nut (2) and a detection mechanism (3), wherein the bolt (1) and the nut (2) can be threadedly connected and jointly clamp a part to be fixed, and the detection mechanism (3) comprises a lower base plate (31), a wire (32), a detector (33), a fixed contact (34) and a movable contact (35), wherein the lower base plate (31) has a fixed contact (34) therein and can be installed between the part to be fixed and the nut (2), and the movable contact (35) is installed on the nut (2) and can contact the fixed contact (34) when the nut (2) is tightened, and the fixed contact (34) and the movable contact (35) are respectively connected to the detector (33) through the wire (32), and the detector (33) can judge whether the fixed contact (34) and the movable contact (35) are in contact by checking whether the energized circuit remains conductive.

2. The self-loosening bolt and nut assembly according to claim 1, characterized in that: The screw rod of the bolt (1) can pass through the lower base plate (31) along the lower through hole; an annular lower blind groove (311) is provided on the bottom surface of the lower base plate (31) and located at the periphery of the lower through hole; a mother flange portion (21) is provided on the top surface of the nut (2) and located at the outer edge; an annular mother flange (22) is provided on the mother flange portion (21) and can extend into the annular lower blind groove (311); and the fixed contact (34) and the movable contact (35) are respectively mounted on the annular lower blind groove (311) and the annular mother flange (22).

3. The self-loosening bolt and nut assembly according to claim 2, characterized in that: The fixed contact (34) and the movable contact (35) are respectively provided with a spacer (36); one end of the wire (32) is electrically connected to the detector (33) and the other end is electrically connected to the fixed contact (34) after passing through the lower substrate (31) and the spacer (36) or is electrically connected to the movable contact (35) after passing through the nut (2) and the spacer (36).

4. The self-loosening type bolt and nut assembly according to claim 3, characterized in that: The lower base plate (31) is provided with a plate body wire barrel (312) at a position where the wire (32) is inserted, and the nut (2) is provided with a mother body wire barrel (23) at a position where the wire (32) is inserted.

5. The self-loosening-proof bolt and nut assembly according to claim 1, characterized in that: A mesh texture is provided on the side of the lower base plate (31) facing the part to be fixed.

6. The self-loosening type bolt and nut assembly according to any one of claims 1 to 5, characterized in that: It also comprises an elastic anti-loosening mechanism (4), which is arranged between the bolt (1) and the detection mechanism (3) and can provide a rebound force to the bolt (3) away from the nut (2) along the axial direction when the nut (2) is tightened.

7. The self-loosening bolt and nut assembly according to claim 6, characterized in that: The elastic anti-loosening mechanism (4) comprises an upper base plate (41), a spring (42) and a top pressure sleeve (43); the screw rod of the bolt (1) can pass through the upper base plate (41) along the upper through hole; an annular upper blind groove (411) is provided on the top surface of the upper base plate (41) and located at the periphery of the upper through hole; a head flange (11) is provided on the bottom surface of the screw head of the bolt (1) and located at the outer edge; a plug post (12) that can extend into the annular upper blind groove (411) is provided on the head flange (11); the spring (42) is sleeved outside the plug post (12) and has an elastic tendency to push the top pressure sleeve (43) away from the head flange (11) when the nut (2) is tightened.

8. The self-loosening type bolt and nut assembly according to claim 7, characterized in that: The two ends of the spring (42) are respectively fixed to the head body flange (11) and the top pressure sleeve (43), and the top pressure sleeve (43) is sleeved outside the plug post (12).

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