CN204553488U - A kind of removable Dogbolt - Google Patents

Abstract

The utility model discloses a detachable backstop bolt, comprising: a bolt body, the bolt body includes a bolt head and a bolt rod, a channel is arranged in the bolt rod, an opening is arranged in the bolt head, and the The groove wall in the bolt rod channel has a convex part protruding inwardly of the channel, a mandrel is installed in the channel, and an expansion sleeve is arranged between the mandrel and the bolt body, and the head of the expansion sleeve is conical. , the head of the expansion sleeve abuts against the convex part in the channel of the bolt shaft, the mandrel includes a polished rod section and a threaded section, the threaded section is arranged in the opening of the bolt head, and the threaded section of the mandrel is installed Nuts are arranged, and several set screws matched with the nuts are installed on the bolt heads. The utility model prevents the bolts from loosening and falling off through the chain fixing method of expansion and radial fixing nuts, thereby greatly improving the connection reliability of the parts. In addition, the bolts in the utility model are detachable bolts, which is greatly convenient. Maintenance of equipment.

Description

A detachable backstop bolt

technical field

The utility model relates to the field of fasteners, in particular to a detachable backstop bolt.

Background technique

In the prior art, bolts usually cooperate with threaded holes on the machine to play the role of connecting fastening parts. After the machine has been running for a period of time, the bolts are slowly loosened and withdrawn due to the long-term vibration of the machine, and then damaged. The phenomenon of suspended fracture occurs, which affects the fastening performance and also shortens the service life of the bolt.

Therefore, it is necessary to provide a detachable backstop bolt that solves the above technical problems.

Utility model content

The technical problem to be solved by the utility model is: to provide a detachable anti-retraction bolt which can prevent the bolt from loosening and falling off and is convenient for maintenance.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a detachable anti-retraction bolt, including: a bolt body, the bolt body includes a bolt head and a bolt shank, and the bolt shank is provided with a A channel arranged axially, the bolt head is provided with an opening communicating with the channel, the channel wall located in the channel of the bolt rod is provided with a convex part protruding inward of the channel, a mandrel is installed in the channel, and the An expansion sleeve is provided between the mandrel and the bolt body. The head of the expansion sleeve is conically arranged. The head of the expansion sleeve abuts against the convex part in the channel of the bolt shaft. The mandrel includes a polished rod section and a A threaded section, the threaded section is arranged in the opening of the bolt head, nuts are installed on the threaded section of the mandrel, and several set screws matching the nuts are installed on the bolt head.

Preferably, in the above-mentioned detachable backstop bolt, the polished rod section of the mandrel includes a first polished rod part and a second polished rod part, and a cone is arranged between the first polished rod part and the second polished rod part. Shaped transition part, the diameter of the first polished rod part is larger than the diameter of the second polished rod part.

Preferably, in the aforementioned detachable backstop bolt, the second polished rod portion of the mandrel is adjacent to the threaded section.

Preferably, in the above-mentioned detachable anti-backlash bolt, the expansion sleeve is installed on the outside of the second polished rod portion of the mandrel.

Preferably, in the above-mentioned detachable anti-backlash bolt, the protrusion is arranged in a ring shape.

Preferably, in the above-mentioned detachable anti-backlash bolt, the protrusion is arranged at a middle position of the bolt rod.

Preferably, in the aforementioned detachable backstop bolt, the number of the set screws is three, and the three set screws are evenly distributed on the head of the bolt.

Preferably, in the aforementioned detachable backstop bolt, the bolt rod is provided with elongated grooves arranged along the axial direction of the bolt rod.

The beneficial effects of the utility model are as follows: the utility model is provided with a mandrel in the bolt body, an expansion sleeve is set between the mandrel and the bolt body, and a nut matched with the mandrel is set in the bolt head and used for fastening the nut. The set screws are fixed, so that the bolts are not easy to loosen and fall off after installation, which greatly improves the connection reliability of the parts. In addition, the bolts in the utility model are detachable bolts, which greatly facilitates the maintenance of the equipment.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in this application. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the structure of the detachable backstop bolt in the utility model.

Fig. 2 is a schematic cross-sectional structure diagram of the detachable anti-retraction bolt in the utility model.

In Fig. 1 and Fig. 2: 1. Bolt body, 2. Bolt head, 3. Bolt shank, 4. Channel, 5. Opening, 6. Groove wall, 7. Protrusion, 8. Mandrel, 9. Expansion sleeve , 10, head, 11, polished rod section, 12, threaded section, 13, first polished rod part, 14, second polished rod part, 15, transition part, 16, nut, 17, set screw, 18, strip shape groove.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described with reference to the drawings are merely exemplary, and the invention is not limited to these embodiments.

Here, it should also be noted that, in order to avoid obscuring the utility model due to unnecessary details, only the structures and/or processing steps closely related to the solution according to the utility model are shown in the drawings, and the Other details that have little relationship with the utility model are described.

Referring to Fig. 1 and Fig. 2, a detachable backstop bolt includes: a bolt body 1, the bolt body 1 includes a bolt head 2 and a bolt shank 3, and the bolt shank 3 is provided with a bolt along the bolt shank 3. The channel 4 arranged in the axial direction, the bolt head 2 is provided with an opening 5 communicating with the channel 4, and the channel wall 6 located in the channel 4 of the bolt rod is provided with a convex part 7 protruding inward of the channel 4, The protrusion 7 is arranged in a ring shape and is located in the middle of the bolt shaft 3 . A mandrel 8 is installed in the channel 4, and an expansion sleeve 9 is arranged between the mandrel 8 and the bolt body 1. The head 10 of the expansion sleeve 9 is conically arranged, and the head of the expansion sleeve 9 The part 10 abuts against the convex part 7 in the bolt shaft channel 4, the mandrel 8 includes a polished rod segment 11 and a threaded segment 12, and the polished rod segment 11 of the mandrel 8 includes a first polished rod part 13 and a second polished rod part 14. A conical transition portion 15 is provided between the first polished rod portion 13 and the second polished rod portion 14, the diameter of the first polished rod portion 13 is larger than the diameter of the second polished rod portion 14, and the first polished rod portion 14 of the mandrel 8 The two polished rods 14 are adjacent to the threaded section 12 . The expansion sleeve 9 is installed on the outside of the second polished rod portion 14 of the mandrel. Described thread section 12 is arranged in the opening 5 of bolt head 2, and nut 16 is installed on described mandrel thread section 12, and several set screws 17 matched with nut 16 are installed on described bolt head 2, in In this embodiment, the number of the set screws 17 is preferably three, and the three set screws 17 are evenly distributed on the bolt head 2 . The bolt shaft 3 is provided with elongated grooves 18 arranged along the axial direction of the bolt shaft 3 .

The working principle of the bolt in the utility model is: when in use, the bolt body 1 is first installed in place, and then the nut 16 is tightened. During the tightening process of the nut 16, the axial displacement of the mandrel 8 and the expansion sleeve 9 occurs, Squeeze the convex part 7 in the bolt shaft channel, the convex part 7 in the bolt shaft channel will be deformed, squeeze the hole wall of the part, thereby increasing the friction force of the bolt rotation, making the bolt difficult to loosen and fall off. In addition, in order to prevent the tightened nut 16 from being loosened due to vibration and other reasons, the utility model fixes the nut 16 on three sides of the set screw 17 so that the nut 16 cannot rotate; Set screw 17, turn nut 16, tap mandrel 8, just can unclamp mandrel 8 and expansion sleeve 9, then rotate bolt body 1, and whole body just disassembles like this.

In summary, the utility model sets the mandrel in the bolt body, sets the expansion sleeve between the mandrel and the bolt body, and sets the nut matching the mandrel and the tightening nut for fastening the nut in the bolt head. Screws can prevent the bolts from loosening and falling off by tightening and radially fixing the nuts, thereby greatly improving the connection reliability of the parts. In addition, the bolts in the utility model are detachable bolts, which greatly facilitates the installation of equipment. overhaul.

Finally, it should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also Other elements not expressly listed, or inherent to the process, method, article, or apparatus are also included.

Claims (8)

1. a removable Dogbolt, it is characterized in that, comprise: bolt body, described bolt body comprises bolt head and bolt shank, the conduit of the axial arranging along bolt shank is provided with in described bolt shank, the opening communicated with conduit is provided with in described bolt head, the cell wall being positioned at bolt shank conduit is convexly equipped with protuberance to conduit, in described conduit, mandrel is installed, expansion set is provided with between described mandrel and bolt body, the head of described expansion set is conically arranged, protuberance in the head of described expansion set and bolt shank conduit abuts against, described mandrel comprises polished rod section and thread section, described thread section is arranged in the opening of bolt head, described mandrel thread section is provided with nut, described bolt head is provided with the several Cock screws matched with nut.

2. a kind of removable Dogbolt as claimed in claim 1, it is characterized in that: the polished rod section of described mandrel comprises the first polished rod portion and the second polished rod portion, be provided with conical transition portion between described first polished rod portion and the second polished rod portion, the diameter in described first polished rod portion is greater than the diameter in the second polished rod portion.

3. a kind of removable Dogbolt as claimed in claim 2, is characterized in that: the second polished rod portion of described mandrel with thread section in being disposed adjacent.

4. a kind of removable Dogbolt as claimed in claim 2, is characterized in that: described expansion set is installed on the outside in mandrel second polished rod portion.

5. a kind of removable Dogbolt as claimed in claim 1, is characterized in that: described protuberance is arranged ringwise.

6. a kind of removable Dogbolt as claimed in claim 5, is characterized in that: described protuberance is arranged at the neutral position of bolt shank.

7. a kind of removable Dogbolt as claimed in claim 1, is characterized in that: the quantity of described Cock screw is three, and three Cock screws are evenly distributed on bolt head.

8. a kind of removable Dogbolt as claimed in claim 1, is characterized in that: described bolt shank is provided with the long strip groove of the axial arranging along bolt shank.