Retaining and anti-falling fastening mechanism

Abstract

The utility model discloses a retaining anti-drop fastening mechanism, which comprises a locking nail, a retaining screw rod and a locking spring, the locking nail comprises a nail cap and a nail body, the locking spring is sleeved on the outer side of the nail body, a baffle plate is fixed on the outer side of the nail body, a plurality of ratchet wheel grooves which are overlapped in sequence are arranged at the bottom of the nail cap in the circumferential direction, a marble is fixed at one end of the retaining screw rod, and the locking spring is sleeved on the locking screw rod. The locking nail is used for fastening at least two parts of instrument equipment, after installation, the locking nail is in threaded connection with the part on the innermost side, the retaining screw is in threaded connection with the part on the outermost side, the outer end of the marble is higher than the outer surface of the part on the outermost side, the outer end of the marble is embedded into a ratchet wheel groove, and the marble and the part on the outermost side are pressed by the nail cap. And the two ends of the locking spring are respectively pressed by a step ring and a separation blade which are arranged in the part on the outermost side. According to the fastening mechanism, the first section of retaining force and the second section of retaining force are applied to the locking nail, so that the retaining force can be increased, the double-retaining and anti-loosening effect is achieved, and the fastening effect on parts of instrument equipment is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of parts fastening and anti-slipping, and in particular relates to a retreat-stopping and anti-slipping fastening mechanism. Background Art

[0002] Instruments and equipment such as incubators, oscillators, and mixers have oscillation and movement functions, and their related components are often connected by fasteners such as screws and bolts. During operation, instruments and equipment oscillate and move repeatedly for a long time, which puts a test on the stability of fasteners. Long-term vibration will bring the risk of loosening of fasteners. For fasteners such as screws and bolts, this problem is often solved by applying thread fasteners on the threaded part. However, the disadvantage of thread fasteners is that they are easy to age and fail, and can only be used once. There is a risk of fasteners being lost during disassembly. After disassembling the fasteners, the original solidified thread fasteners need to be removed and re-applied with new thread fasteners before installation, which makes disassembly and assembly inconvenient. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a fastening mechanism which is quick to install and has double fastening effects of fastening and preventing loosening, in view of the deficiencies of the prior art.

[0004] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a back-stop and anti-slip fastening mechanism, including a locking nail, a back-stop screw and a locking spring, the locking nail including a nail cap and a nail body, the locking spring sleeved on the outer side of the nail body, a baffle fixed on the outer side of the nail body, a plurality of ratchet grooves overlapping in sequence are opened in the circumferential direction of the bottom of the nail cap, a marble is fixed on one end of the back-stop screw, the locking nail is used to fasten at least two parts of the instrument and equipment, after installation, the locking nail is threadedly connected to the innermost part, the back-stop screw is threadedly connected to the outermost part, the outer end of the marble is higher than the outer surface of the outermost part, the outer end of the marble is embedded in one of the ratchet grooves, the marble and the outermost part are both pressed by the nail cap, and the two ends of the locking spring are respectively pressed by the step ring and the baffle arranged in the outermost part.

[0005] The utility model has a fastening mechanism for preventing retreat and disengagement, which is quick to install. After installation, taking the vertical installation of the locking nail as an example, the locking spring in a compressed state exerts a downward force on the locking nail, which is the first stage of the anti-retreat force provided by the fastening mechanism to the locking nail. At the same time, the outer end of the marble is embedded in a ratchet groove and is pressed by the nail cap. The squeezed and deformed marble cooperates with the ratchet groove to exert an upward force on the locking nail, which is the second stage of the anti-retreat force provided by the fastening mechanism to the locking nail, which can increase the friction between the marble and the nail cap. On the basis of the first stage of the anti-retreat force, the second stage of the anti-retreat force can further increase the anti-retreat force, achieving a double anti-retreat and anti-loosening effect, and ensuring the fastening effect of the parts of the instrument and equipment. If the locking pin becomes loose during the operation of the instrument, the locking pin has a tendency to move upward, and the looser the locking pin is, the greater the tendency of the locking pin to move upward. At the same time, the greater the compression of the locking spring, the greater the downward force of the locking spring on the locking pin. In other words, the looser the locking pin is, the greater the downward pressure on the locking spring is, and the greater the downward pressure, the less likely the locking pin will loosen. Finally, when the loose point and the downward pressure are in a balanced state, the locking pin will not disengage.

[0006] Preferably, the nail body comprises a first polished rod segment, a second polished rod segment and a threaded segment connected in sequence, the first polished rod segment is connected to one side of the nail cap, the outer diameter of the second polished rod segment is smaller than the outer diameter of the first polished rod segment and the outer diameter of the threaded segment, the locking spring is sleeved on the outer side of the second polished rod segment, an annular groove is provided at the junction of the second polished rod segment and the threaded segment, and the baffle is fixed in the annular groove.

[0007] Furthermore, a threaded blind hole is provided on the outermost part, a threaded hole is provided on the innermost part, and coaxial through holes with the same aperture are provided on the parts other than the innermost part, the aperture of the through hole is larger than the maximum outer diameter of the nail body, the step ring is provided in the circumferential direction of the through hole, the inner diameter of the step ring matches the outer diameter of the second polished rod segment, after installation, the stop screw is threadedly connected in the threaded blind hole, the first polished rod segment and the second polished rod segment are penetrated through the through hole, the threaded segment is threadedly connected in the threaded hole, and the locking spring is located in an annular cavity surrounded by the step ring, the inner surface of the through hole, the baffle and the outer surface of the first polished rod segment.

[0008] Preferably, from the cross section of each ratchet groove, along the tightening direction of the locking nail, the radius of curvature of the ratchet groove on one side of the tightening direction is smaller than the radius of curvature of the other side. The radius of curvature on one side of the ratchet groove is smaller, the slope of the cross section is larger, and the nail cap exerts a greater extrusion force on the marble, that is, the reaction force of the marble that the nail cap needs to overcome is larger; the radius of curvature on the other side of the ratchet groove is larger, the slope of the cross section is smaller, and the nail cap exerts a smaller extrusion force on the marble, that is, the reaction force of the marble that the nail cap needs to overcome is smaller. Therefore, under the condition that the extrusion force of the nail cap on the marble is the same, the force required to loosen the locking nail is much greater than the force required to tighten the locking nail, thereby further improving the anti-loosening effect of the locking nail. In practical applications, by designing and adjusting the slope of both sides of the ratchet groove cross section, the difference between the force required to loosen the locking nail and the force required to tighten the locking nail can be adjusted to achieve a predetermined anti-loosening effect.

[0009] Preferably, the outer surface of the nail cap is provided with straight knurling, and the outer end of the nail cap is provided with a hexagonal countersunk hole to facilitate the rotation and tightening operation of the locking nail.

[0010] Compared with the prior art, the utility model has the following advantages: the anti-retreat and anti-slip fastening mechanism of the utility model cooperates with the locking nail through the locking spring and the anti-retreat screw, and the locking spring in a compressed state applies the first section of anti-retreat force to the locking nail, and the marble on the anti-retreat screw applies the second section of anti-retreat force to the locking nail. On the basis of the first section of anti-retreat force, the second section of anti-retreat force can further increase the anti-retreat force, so as to achieve a double anti-retreat and anti-loosening effect, and ensure the fastening effect of the parts of the instrument and equipment. If the locking nail becomes loose during the operation of the instrument and equipment, the looser the locking nail is, the greater the downward pressure on the locking spring is, and the greater the downward pressure is, the less likely the locking nail will loosen. Finally, when the loose point and the downward pressure are in a balanced state, the locking nail will not fall off. In addition, the anti-retreat and anti-slip fastening mechanism of the utility model is quick to install, and can effectively improve the stability and work efficiency of the instrument and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the appearance of the anti-retraction and anti-dropping fastening mechanism in the embodiment (excluding the locking spring and the blocking piece);

[0012] Figure 2 This is an exploded view of the anti-retraction fastening mechanism before installation in the embodiment;

[0013] Figure 3 The effect of the anti-retraction fastening mechanism after installation in the embodiment is shown in cross section Figure 1 ;

[0014] Figure 4 The effect of the anti-retraction fastening mechanism after installation in the embodiment is shown in cross section Figure 2 ;

[0015] Figure 5After removing the upper cover and the locking screw Figure 4 A magnified view of the cross section of the middle ratchet groove;

[0016] Figure 6 Schematic diagram of the matching angle between the marble and the ratchet groove in the embodiment;

[0017] The specific reference numerals in the figure are as follows:

[0018] 1-locking nail, 11-nail cap, 12-nail body, 13-straight knurling, 14-hexagonal countersunk hole, 15-first polished rod section, 16-second polished rod section, 17-threaded section, 18-ring groove, 2-retraction screw, 21-marble, 3-locking spring, 31-annular cavity, 4-blocking plate, 5-ratchet groove, 51-one side of the cross section of the ratchet groove, 52-the other side of the cross section of the ratchet groove, 61-upper cover plate, 62-lower pressure plate, 63-threaded blind hole, 64-through hole, 65-threaded hole, 66-step ring. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] The anti-retraction and anti-dropping fastening mechanism of the embodiment is as follows: Figure 1-Figure 5 As shown, it includes a locking nail 1, a stop screw 2 and a locking spring 3. The locking nail 1 includes a nail cap 11 and a nail body 12. The locking spring 3 is sleeved on the outside of the nail body 12. A baffle 4 is fixed to the outside of the nail body 12. The outer surface of the nail cap 11 is provided with a straight knurling 13. The outer end of the nail cap 11 is provided with a hexagonal countersunk hole 14. A plurality of ratchet grooves 5 that overlap in sequence are provided in the circumferential direction of the bottom of the nail cap 11. From the cross-section of each ratchet groove 5, along the tightening direction of the locking nail 1 (clockwise in this embodiment), the curvature radius of the ratchet groove 5 on one side 51 facing the tightening direction is smaller than the curvature radius 52 on the other side. A marble 21 is fixed to one end of the stop screw 2. The locking nail 1 is used to fasten two parts of the instrument, namely, an upper cover plate 61 and a lower pressure plate 62 stacked up and down.

[0021] In this embodiment, the nail body 12 includes a first polished rod segment 15, a second polished rod segment 16 and a threaded segment 17 which are connected in sequence. The first polished rod segment 15 is connected to one side of the nail cap 11. The outer diameter of the second polished rod segment 16 is smaller than the outer diameter of the first polished rod segment 15 and the outer diameter of the threaded segment 17. The locking spring 3 is sleeved on the outer side of the second polished rod segment 16. An annular groove 18 is provided at the connection between the second polished rod segment 16 and the threaded segment 17, and the baffle 4 is fixed in the annular groove 18.

[0022] In this embodiment, a threaded blind hole 63 and a through hole 64 of M3 and a depth of 12 mm are provided on the upper cover plate 61, and a threaded hole 65 is provided on the lower pressure plate 62. The aperture of the through hole 64 is larger than the maximum outer diameter of the nail body 12, and a step ring 66 is provided in the circumferential direction of the through hole 64. The inner diameter of the step ring 66 matches the outer diameter of the second polished rod segment 16.

[0023] When installing the above-mentioned fastening mechanism, first thread the stop screw 2 into the threaded blind hole 63, so that the outer end of the marble 21 is higher than the outer surface of the upper cover plate 61 and embedded in a ratchet groove 5, and then the nail body 12 of the locking nail 1 is installed in the through hole 64, and then the locking spring 3 is sleeved on the outer side of the second polished rod segment 16 from bottom to top, and then the baffle 4 is installed in the annular groove 18, so that the locking spring 3 is compressed and arranged in the annular cavity 31 surrounded by the step ring 66, the inner surface of the through hole 64, the baffle 4 and the outer surface of the first polished rod segment 15, and the two ends of the locking spring 3 are respectively pressed by the step ring 66 and the baffle 4, and then the locking nail 1 is rotated clockwise to screw the threaded section 17 of the locking nail 1 into the threaded hole 65 on the lower pressure plate 62 to complete the installation. At this time, the nail cap 11 presses the upper cover plate 61, and the locking spring 3 generates a downward force on the locking nail 1, which is the first section of the anti-retraction force provided by the fastening mechanism to the locking nail 1. At the same time, the outer end of the marble 21 is embedded in a ratchet groove 5 and is pressed by the nail cap 11. The squeezed and deformed marble 21 cooperates with the ratchet groove 5 to generate an upward force on the locking nail 1, which is the second section of the anti-retraction force provided by the fastening mechanism to the locking nail 1, which can increase the friction between the marble 21 and the nail cap 11. On the basis of the first section of the anti-retraction force, the second section of the anti-retraction force can further increase the anti-retraction force to achieve a double anti-retraction and anti-loosening effect, ensuring the fastening effect of the upper cover plate 61 and the lower pressure plate 62, so that the upper cover plate 61 and the lower pressure plate 62 are completely fitted. In addition, the anti-retraction and anti-detachment fastening mechanism is quick to install and can effectively improve the stability and work efficiency of the instrument and equipment.

[0024] If the locking pin 1 becomes loose during the operation of the instrument, the locking pin 1 tends to move upward, and the looser the locking pin 1 is, the greater the upward movement tendency of the locking pin 1 is, and at the same time, the greater the compression of the locking spring 3 is, the greater the downward force of the locking spring 3 on the locking pin 1 is. In other words, the looser the locking pin 1 is, the greater the downward pressure on the locking spring 3 is, and the greater the downward pressure is, the less likely the locking pin 1 will loosen. Finally, when the loose point and the downward pressure are in a balanced state, the locking pin 1 does not disengage.

[0025] In this embodiment, Figure 6 As shown, the side 51 of the ratchet groove 5 facing the tightening direction (i.e. Figure 6 The curvature radius of the ratchet groove 5 is small, and the slope of the cross section is large, which is designed to be about 42°. The reaction force of the marble 21 that the nail cap 11 needs to overcome is F1=F·tan42°≈0.9F; the other side 52 (i.e. Figure 6 The curvature radius of the nail cap 11 is larger, and the slope of the cross section is smaller, which is designed to be about 13°. The reaction force of the marble 21 that the nail cap 11 needs to overcome is F2=F·tan13°≈0.23F. Where F is the squeezing force of the nail cap 11 on the marble 21. Therefore, when the squeezing force of the nail cap 11 on the marble 21 is the same, the force required to loosen the locking nail 1 is much greater than the force required to tighten the locking nail 1, and the difference between the two is nearly 4 times, which can further improve the anti-loosening effect of the locking nail 1.

Claims

1. A fastening mechanism for preventing retreat and disengagement, characterized in that: It includes a locking nail, a stop screw and a locking spring. The locking nail includes a nail cap and a nail body. The locking spring is sleeved on the outside of the nail body. A baffle is fixed on the outside of the nail body. A plurality of ratchet grooves overlapping in sequence are opened in the circumferential direction of the bottom of the nail cap. A marble is fixed at one end of the stop screw. The locking nail is used to fasten at least two parts of the instrument and equipment. After installation, the locking nail is threadedly connected to the innermost part, the stop screw is threadedly connected to the outermost part, the outer end of the marble is higher than the outer surface of the outermost part, the outer end of the marble is embedded in one of the ratchet grooves, the marble and the outermost part are both pressed by the nail cap, and the two ends of the locking spring are respectively pressed by the step ring and the baffle arranged in the outermost part.

2. The anti-retraction and anti-dropping fastening mechanism according to claim 1, characterized in that: The nail body includes a first polished rod segment, a second polished rod segment and a threaded segment connected in sequence, the first polished rod segment is connected to one side of the nail cap, the outer diameter of the second polished rod segment is smaller than the outer diameter of the first polished rod segment and the outer diameter of the threaded segment, the locking spring is sleeved on the outer side of the second polished rod segment, and an annular groove is provided at the connection between the second polished rod segment and the threaded segment, and the blocking piece is fixed in the annular groove.

3. The anti-retraction and anti-dropping fastening mechanism according to claim 2, characterized in that: A threaded blind hole is provided on the outermost part, a threaded hole is provided on the innermost part, and coaxial through holes with the same aperture are provided on the parts other than the innermost part. The aperture of the through hole is larger than the maximum outer diameter of the nail body. The step ring is provided in the circumferential direction of the through hole. The inner diameter of the step ring matches the outer diameter of the second polished rod segment. After installation, the stop screw is threadedly connected in the threaded blind hole, the first polished rod segment and the second polished rod segment are penetrated through the through hole, the threaded segment is threadedly connected in the threaded hole, and the locking spring is located in an annular cavity surrounded by the step ring, the inner surface of the through hole, the baffle and the outer surface of the first polished rod segment.

4. The anti-retraction and anti-dropping fastening mechanism according to claim 1, characterized in that: Viewed from the cross section of each ratchet groove, along the tightening direction of the locking nail, the radius of curvature of the ratchet groove on one side facing the tightening direction is smaller than the radius of curvature of the other side.

5. The anti-retraction and anti-dropping fastening mechanism according to claim 1, characterized in that: The outer surface of the nail cap is provided with straight knurling, and the outer end of the nail cap is provided with a hexagonal countersunk hole.

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