Lock bolt

Abstract

The lock bolt comprises a screw rod and a nut, the lock bolt is spirally installed on a to-be-fastened piece, and the lock bolt is characterized in that the lock bolt further comprises a lock sleeve, the screw rod is movably sleeved with the lock sleeve, a positioning protrusion is installed at the bottom of the lock sleeve, a positioning counter bore is formed in the surface of the to-be-fastened piece, and the positioning protrusion is matched with the positioning counter bore in a clamped mode. According to the anti-loosening device, the anti-loosening sleeve is fixedly connected with a fastened piece in a clamped mode and cannot rotate, the limiting pawl fixed to the anti-loosening sleeve is matched with ratchet teeth on the screw in a clamped mode to abut against a bolt which tends to loosen, the anti-loosening purpose is finally achieved, and the anti-loosening device still has the anti-loosening capacity under the vibration working condition in the mode. And operation is easy and convenient, and disassembly is convenient when secondary disassembly and assembly are needed during maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-loosening bolts, in particular to an anti-loosening bolt. Background Art

[0002] At present, in the production and manufacturing of industrial equipment, bolt connection is the most widely used detachable connection method. Once the bolt connection becomes loose, in the lightest case, there will be abnormal vibration of the equipment, increased wear, and operating failures. In the most serious case, the equipment will be scrapped or even cause injury.

[0003] At present, the traditional anti-loosening methods for bolt connections include anti-loosening with spring washers, anti-loosening with opposed nuts, etc. Although these anti-loosening methods are simple and convenient to operate, their anti-loosening ability under vibration conditions is insufficient. In addition, there are some bolt anti-loosening methods, such as spot welding, punching, and thread locking adhesives. Although these anti-loosening methods have good anti-loosening effects, they are very inconvenient to operate and even cannot be disassembled when secondary disassembly and assembly are required for maintenance.

[0004] Therefore, in view of the deficiencies of the prior art, it is very necessary to provide an anti-loosening bolt to solve the deficiencies of the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to avoid the deficiencies of the prior art and provide an anti-loosening bolt. The anti-loosening bolt is fixedly connected to the fastener through an anti-loosening sleeve and cannot rotate. The limiting pawl fixed to the anti-loosening sleeve is engaged with the ratchet teeth on the screw rod to hold the bolt with a tendency to loosen, ultimately achieving the purpose of anti-loosening. This method still has anti-loosening ability under vibration conditions, is simple and convenient to operate, and is easy to disassemble when secondary disassembly and assembly are required for maintenance.

[0006] The above object of the utility model is achieved by the following technical means.

[0007] Provide an anti-loosening bolt, including a screw rod and a nut. The anti-loosening bolt is helically installed on the fastener to be fastened. It is characterized in that: the anti-loosening bolt further includes an anti-loosening sleeve. The anti-loosening sleeve is movably sleeved on the screw rod. A positioning protrusion is installed at the bottom of the anti-loosening sleeve. A positioning counterbore is provided on the surface of the fastener to be fastened. The positioning protrusion is engaged with the positioning counterbore. The anti-loosening sleeve is in ratchet cooperation with the screw rod.

[0008] Specifically, an activity groove is provided on the anti-loosening sleeve. An upper through fixing hole and a lower through fixing hole are respectively provided on the anti-rotation sleeve above and below the activity groove. A rotating shaft pin is installed on the upper through fixing hole, the activity groove, and the lower through fixing hole. A limiting pawl is rotatably installed outside the rotating shaft pin in the activity groove.

[0009] Preferably, ratchet teeth are fixedly installed on the side wall of the screw rod below the nut. One end of the limiting pawl is engaged with the ratchet teeth, and the other end is elastically connected to the side wall of the activity groove through a spring.

[0010] Specifically, the locking direction of the ratchet teeth and the limiting pawl is the loosening direction of the screw.

[0011] In the utility model, the anti-loosening sleeve is fixedly clamped with the fastened part and cannot rotate. The limiting pawl fixed to the anti-loosening sleeve is clamped and matched with the ratchet teeth on the screw to hold the bolt with a tendency to loosen, ultimately achieving the purpose of anti-loosening. This method still has anti-loosening ability under vibration conditions, and the operation is simple and convenient. When secondary disassembly is required for maintenance, it is easy to disassemble. Description of the Drawings

[0012] The present utility model is further described with the aid of the drawings, but the content in the drawings does not constitute any limitation to the present utility model.

[0013] Figure 1 is a three-dimensional structural schematic diagram of an anti-loosening bolt of the present utility model.

[0014] Figure 2 is a three-dimensional structural schematic diagram of the installation of an anti-loosening bolt of the present utility model and the part to be fastened.

[0015] Figure 3 is an exploded structural schematic diagram of an anti-loosening bolt of the present utility model.

[0016] Figure 4 is a schematic side sectional view of the installation of an anti-loosening bolt of the present utility model and the part to be fastened.

[0017] From Figures 1 to 4 it includes:

[0018] 1. Screw;

[0019] 2. Nut;

[0020] 3. Part to be fastened;

[0021] 4. Anti-loosening sleeve;

[0022] 5. Positioning protrusion;

[0023] 6. Positioning counterbore;

[0024] 7. Activity groove;

[0025] 8. Upper through-hole fixing hole;

[0026] 9. Lower through-hole fixing hole;

[0027] 10. Rotating shaft pin;

[0028] 11. Limiting pawl;

[0029] 12. Ratchet teeth;

[0030] 13. Spring. Detailed implementation mode

[0031] The present utility model will be further described in conjunction with the following embodiments.

[0032] Embodiment 1.

[0033] As Figures 1-4 shown, a locking prevention bolt includes a screw rod 1 and a nut 2. The locking prevention bolt is helically installed on a fastener to be fastened 3. Its characteristic lies in that: the locking prevention bolt further includes a locking prevention sleeve 4. The locking prevention sleeve 4 is movably sleeved on the screw rod 1. A positioning protrusion 5 is installed at the bottom of the locking prevention sleeve 4. A positioning counterbore 6 is formed on the surface of the fastener to be fastened 3. The positioning protrusion 5 is in snap-fit with the positioning counterbore 6. The locking prevention sleeve 4 and the screw rod 1 are in ratchet fit.

[0034] This application is used for preventing loosening of bolts used in industrial equipment. The positioning protrusion 5 at the bottom of the locking prevention sleeve 4 is in snap-fit with the positioning counterbore 6 formed on the surface of the fastener to be fastened 3 to keep the locking prevention sleeve 4 from rotating. Then, the ratchet fit between the locking prevention sleeve 4 and the screw rod 1 is used to prevent the screw rod 1 from loosening.

[0035] An activity groove 7 is formed on the locking prevention sleeve 4. An upper through fixing hole 8 and a lower through fixing hole 9 are respectively formed on the anti-rotation sleeve above and below the activity groove 7. A rotating shaft pin 10 is installed on the upper through fixing hole 8, the activity groove 7 and the lower through fixing hole 9. A limiting ratchet pawl 11 is rotatably sleeved outside the rotating shaft pin 10 in the activity groove 7.

[0036] A ratchet tooth 12 is fixedly installed on the side wall of the screw rod 1 below the nut 2. One end of the limiting ratchet pawl 11 is in snap-fit with the ratchet tooth 12, and the other end is elastically connected to the side wall of the activity groove 7 through a spring 13.

[0037] The locking prevention sleeve 4 is rotatably sleeved on the rotating shaft pin 10 through the limiting ratchet pawl 11. When the bolt needs to be tightened, the positioning protrusion 5 on the lower surface of the locking prevention sleeve 4 must be placed into the positioning counterbore 6 of the fastener to be fastened 3. The central hole of the locking prevention sleeve 4 is aligned with the round hole of the fastener to be fastened 3. The bolt with a ratchet is aligned with the central hole of the locking prevention sleeve 4. Press the limiting ratchet pawl 11 by hand to expand the limiting ratchet pawl 11 to ensure that the bolt with the ratchet tooth 12 can pass through. After the limiting ratchet pawl 11 contacts the ratchet tooth 12, the limiting ratchet pawl 11 can be released, and the bolt can be tightened with a tool.

[0038] The locking direction of the ratchet tooth 12 and the limiting ratchet pawl 11 is the loosening direction of the screw rod 1.

[0039] When the bolt is tightened, the ratchet tooth 12 and the limiting ratchet pawl 11 will not bite, and the tightening of the bolt is not affected. On the contrary, when the locking prevention bolt needs to be loosened, if the limiting ratchet is not pressed, the locking prevention bolt cannot rotate.

[0040] The utility model is fixedly connected to the fastened part through the anti-loosening sleeve 4 and cannot rotate. The limiting pawl 11 fixed to the anti-loosening sleeve 4 is engaged with the ratchet teeth 12 on the screw rod 1 to hold the bolt with a tendency to loosen, ultimately achieving the purpose of anti-loosening. This method still has anti-loosening ability under vibration conditions, and is simple and convenient to operate. When secondary disassembly and assembly are required for maintenance, it is easy to disassemble.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit the protection scope of the present utility model. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present utility model.

Claims

1. A locking bolt, comprising a screw rod and a nut, wherein the locking bolt is screwed onto a fastener, and is characterized in that: The anti-loosening bolt also includes an anti-loosening sleeve, which is movably mounted on the screw rod, a positioning protrusion is installed at the bottom of the anti-loosening sleeve, a positioning countersunk hole is opened on the surface of the fastener, the positioning protrusion is snap-fitted with the positioning countersunk hole, and the anti-loosening sleeve cooperates with the screw rod ratchet.

2. The anti-loosening bolt according to claim 1, characterized in that: The anti-loosening sleeve is provided with a movable groove, and an upper through-fixing hole and a lower through-fixing hole are respectively provided above and below the movable groove on the anti-loosening sleeve, and a rotating shaft pin is installed on the upper through-fixing hole, the movable groove and the lower through-fixing hole, and a limiting pawl is rotatably mounted on the outside of the rotating shaft pin in the movable groove.

3. The anti-loosening bolt according to claim 2, characterized in that: A ratchet tooth is fixedly mounted on the side wall of the screw rod below the nut, one end of the position-limiting pawl is snap-fitted with the ratchet tooth, and the other end is elastically connected to the side wall of the movable groove through a spring.

4. The anti-loosening bolt according to claim 3, characterized in that: The locking direction of the ratchet teeth and the limiting pawl is the loosening direction of the screw rod.

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