Novel screw for box transformer substation prefabricated foundation

Abstract

The utility model relates to the technical field of fasteners, and provides a novel screw for a box transformer substation prefabricated foundation, which comprises an auxiliary sleeve provided with a cylindrical outer wall and internal threads, and limiting elastic fins are arranged on the cylindrical outer wall; the fastening piece is provided with an external thread, the external thread is used for being arranged on the internal thread, the fastening piece is further provided with a conical face, and the conical face abuts against the limiting elastic fins so that the limiting elastic fins can be opened outwards. According to the technical scheme, the problem that in the prior art, an external threaded hole is inconvenient to machine due to the fact that a workpiece is positioned through a conical screw is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fastener technical field, specifically, relate to box -type transformer prefabricated foundation new screw. BACKGROUND

[0002] Box -type transformer prefabricated foundation installs, usually will use flat head screw fastening, ideal state, the thread will not be misaligned, guarantee positioning accurate, but actual situation is that flat head screw can be because installation angle deviation, uneven force etc. Thread misalignment appears, lead to positioning, connection not up to standard, influence workpiece's positioning and subsequent processing, one kind of improvement mode is to set up external thread hole on workpiece, and use external thread, the shape of external thread makes it have certain guiding effect when screwing in, can more accurately align the thread hole, facilitate installation operation, reduce installation difficulty and error, but this kind of mode has a problem that external thread hole is more tedious and complex on workpiece and is frequently processed, therefore needs to improve the existing connecting mode to solve the above -mentioned problem. SUMMARY

[0003] The utility model discloses box -type transformer prefabricated foundation new screw, solve the problem of inconvenient processing external thread hole of workpiece positioning mode of adopting conical screw in relevant technology.

[0004] The technical scheme of the utility model is as follows:

[0005] Box -type transformer prefabricated foundation new screw,

[0006] Auxiliary sleeve has cylindrical outer wall and internal thread, the cylindrical outer wall has the limit elastic fin;

[0007] Fastener has external thread, the external thread is used to set up on the internal thread, the fastener still has the taper surface, and the taper surface and the limit elastic fin abutment make the limit elastic fin open outwards.

[0008] As a further technical scheme, still include,

[0009] Positioning elastic fin sets up on the cylindrical outer wall and is used for positioning the auxiliary sleeve.

[0010] As a further technical scheme, the limit elastic fin has a plurality of, and interval distribution around the circumference of the cylindrical outer wall.

[0011] As a further technical scheme, the taper of the external thread is 1:12.

[0012] As a further technical scheme, the tooth type angle of the external thread is 50 DEG.

[0013] As a further technical scheme, the tooth type height of the external thread is 1.2mm.

[0014] As a further technical solution, the pitch of the external thread is 2mm.

[0015] The working principle and beneficial effects of the utility model are:

[0016] In the utility model, the auxiliary sleeve is first placed in the mounting hole of the workpiece and the base, the cylindrical outer wall of the auxiliary sleeve helps to preliminarily position and cooperate with the mounting hole of the prefabricated foundation during installation, the limiting elastic fin on the cylindrical outer wall can be opened outward when the fastener is screwed in, thereby increasing the friction and holding force with the inner wall of the mounting hole, preventing the auxiliary sleeve from loosening or displacing during use, and ensuring the stability of the entire screw connection structure.

[0017] The cooperation of the auxiliary sleeve and the fastener avoids the complex machining process step of frequently opening a conical hole on the plate, only a limiting groove cooperating with the limiting elastic fin needs to be opened, and the cylindrical outer wall of the auxiliary sleeve avoids the problem of substandard positioning. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above characteristics, technical features, advantages and implementation modes of the utility model will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0019] Fig. 1 It is an auxiliary sleeve structure schematic view in the utility model;

[0020] Fig. 2 It is a fastener structure schematic view in the utility model;

[0021] Fig. 3 It is a limiting elastic fin structure schematic view in the utility model;

[0022] In the drawing: 1, auxiliary sleeve, 2, cylindrical outer wall, 3, internal thread, 4, limiting elastic fin, 5, fastener, 6, external thread, 7, conical surface, 8, limiting elastic fin. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the specific implementation modes of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor, and other embodiments can also be obtained.

[0024] For the sake of simplicity of the drawings, only the parts related to the utility model are shown in the drawings, and they do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this text, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0025] In this text, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0027] As Figs. 1-2 shown, a new type of screw for box transformer prefabricated foundation is proposed, which comprises an auxiliary sleeve 1 and a fastener 5. The auxiliary sleeve 1 has a cylindrical outer wall 2 and an internal thread 3, and the cylindrical outer wall 2 has a limiting elastic fin 4. The fastener 5 has an external thread 6, which is arranged on the internal thread 3. The fastener 5 also has a tapered surface 7, which abuts against the limiting elastic fin 4 to make the limiting elastic fin 4 open outward.

[0028] In this embodiment, in order to solve the problem that the positioning method of the workpiece using the tapered screw in the related art is not convenient for machining the external thread 6 hole, the auxiliary sleeve 1 is first placed in the mounting hole of the prefabricated foundation. The cylindrical outer wall 2 of the auxiliary sleeve 1 helps to preliminarily position and cooperate with the mounting hole of the prefabricated foundation during installation. The limiting elastic fin 4 on the cylindrical outer wall 2 can open outward when the fastener 5 is screwed in, thereby increasing the friction and holding force with the inner wall of the mounting hole, preventing the auxiliary sleeve 1 from loosening or shifting during use, and ensuring the stability of the entire screw connection structure.

[0029] The cooperation of the auxiliary sleeve 1 and the fastener 5 avoids the complex machining process step of frequently opening the tapered hole on the plate. Only a limiting groove cooperating with the limiting elastic fin 4 needs to be opened on the mounting hole. The cylindrical outer wall 2 of the auxiliary sleeve 1 avoids the problem of substandard positioning.

[0030] Further, it further comprises a positioning elastic fin 8, which is arranged on the cylindrical outer wall 2 and used for positioning the auxiliary sleeve 1.

[0031] AsFig. 3 As shown, in order to facilitate finding the preset position of the auxiliary sleeve 1, the preset position is the position where the limiting elastic fins 4 and the limiting grooves are aligned, and a positioning elastic fin 8 with elasticity is also arranged on the limiting elastic fin 4, and a clamping groove is arranged on the mounting hole to cooperate with it. The positioning elastic fin 8 is inclined, and the inclination is downward along the radial direction away from the auxiliary sleeve 1. When the positioning elastic fin 8 is initially put in, the positioning elastic fin 8 can be retracted to avoid interference with the inner wall of the mounting hole. When the auxiliary sleeve 1 is lowered to the preset position, the positioning elastic fin 8 will also be aligned with the clamping groove. At this time, the positioning elastic fin 8 will pop out relying on its own elasticity, and the auxiliary sleeve 1 is preliminarily fixed in the mounting hole. Then, the fastener 5 is loaded into the auxiliary sleeve 1, and the limiting elastic fin 4 is opened, and the prefabricated foundation is locked.

[0032] In addition, when the auxiliary sleeve 1 needs to be disassembled, it is also very convenient. Only the fastener 5 needs to be removed, and then the auxiliary sleeve 1 can be pulled out in the reverse direction. During the process of pulling out the auxiliary sleeve 1 in the reverse direction, the positioning elastic fin 8 will be pressed back by the inner wall of the mounting hole due to its elasticity, and will not be stuck and will not interfere with the recovery of the auxiliary sleeve 1.

[0033] Further, the limiting elastic fins 4 are several and are distributed at intervals around the circumferential direction of the cylindrical outer wall 2.

[0034] In this embodiment, the limiting elastic fins 4 have elasticity and can be reset after the fastener 5 is detached. The several limiting elastic fins 4 can make the prefabricated foundation more tightly and stably in the axial direction.

[0035] Further, the taper of the external thread 6 is 1:12.

[0036] In this embodiment, the taper of 1:12 is adopted. Compared with the conventional and common taper of 1:16, this steeper taper can generate greater radial holding force faster during the tightening process, effectively enhancing the fastening and anti-vibration of the connection, and is particularly suitable for working environments with frequent vibrations and large impacts.

[0037] Further, the tooth type angle of the external thread 6 is 50°.

[0038] In this embodiment, the tooth type angle is set to 50°. Compared with the conventional tooth type angle of 60° or 55°, the 50° tooth type angle can make the force distribution more uniform when bearing axial force and radial force, reduce stress concentration phenomenon, and improve the fatigue life and connection reliability of the thread.

[0039] Further, the tooth type height of the external thread 6 is 1.2mm.

[0040] In this embodiment, this height takes into account the convenience of processing and the saving of materials while ensuring the strength of the thread, so that the thread can form a stable connection structure during the screwing process, effectively transfer the load and maintain the sealing performance.

[0041] Further, the pitch of the external thread 6 is 2mm.

[0042] In this embodiment, the pitch value achieves a good balance between the self-locking performance and the screwing efficiency of the threaded connection. The larger pitch enables the connection fastening force to be quickly established during the tightening process, and at the same time, when dynamic load is borne, the interaction force distribution between adjacent thread teeth is more reasonable, reducing the risk of connection failure due to overloading of individual thread teeth.

[0043] In summary, the taper of 1:12 enables the fastener 5 to uniformly exert the outward opening force on the limiting elastic fin 4 when it is screwed into the internal thread 3 of the auxiliary sleeve 1, so that the limiting elastic fin 4 gradually opens and closely fits the wall of the mounting hole. The thread angle of 50° ensures sufficient connection strength while facilitating the processing and manufacturing of the thread and the screwing operation. The thread height of 1.2mm and the pitch of 2mm can provide appropriate thread connection strength and screwing convenience, making the connection between the fastener 5 and the auxiliary sleeve 1 more reliable, capable of bearing various loads during the use of the prefabricated foundation of the box-type transformer, preventing the connection from loosening, prolonging the service life, and ensuring the safe and stable operation of the box-type transformer equipment.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. New screws for prefabricated foundation of box-type transformer, characterized by: include, An auxiliary sleeve (1) has a cylindrical outer wall (2) and an internal thread (3), wherein the cylindrical outer wall (2) is provided with a limiting elastic wing (4); The fastener (5) has an external thread (6) which is used to be arranged on the internal thread (3). The fastener (5) also has a tapered surface (7) which abuts against the limiting elastic wing (4) so ​​that the limiting elastic wing (4) is opened outward.

2. The new screw for prefabricated foundation of box-type transformer substation according to claim 1 is characterized in that: Also includes, Positioning elastic wings (8) are provided on the cylindrical outer wall (2) and are used to position the auxiliary sleeve (1).

3. The new screw for prefabricated foundation of box-type transformer substation according to claim 1 is characterized in that: There are a plurality of limiting elastic wings (4), which are distributed at intervals in the circumferential direction around the cylindrical outer wall (2).

4. The new screw for prefabricated foundation of box-type transformer substation according to claim 1 is characterized in that: The taper of the external thread (6) is 1:

12.

5. The new screw for prefabricated foundation of box-type transformer substation according to claim 1 is characterized in that: The tooth angle of the external thread (6) is 50°.

6. The new screw for prefabricated foundation of box-type transformer substation according to claim 1 is characterized in that: The tooth profile height of the external thread (6) is 1.2 mm.

7. The new screw for prefabricated foundation of box-type transformer substation according to claim 1 is characterized in that: The pitch of the external thread (6) is 2 mm.

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