Special tool for fastening bolt in narrow space

Abstract

The utility model provides a special tool for fastening a bolt in a narrow space, which relates to the field of fastening tools and comprises a damping ring connecting piece fixed by a threaded fastener, a locking piece is mounted on the threaded fastener, a folding edge of the locking piece clings to one side of a nut, a sleeve is sleeved on the outer surface of the nut, a J-shaped stress application rod is mounted at the tail of the sleeve, and the J-shaped stress application rod is fixed on the damping ring connecting piece. The sleeve is matched with the nut, and one end of the sleeve is provided with a groove used for containing the folded edge of the locking piece. According to the special tool for fastening the bolt in the narrow and small space, the tilting part of the locking piece is located in the groove, so that the conflict between a socket spanner and the locking piece is avoided, the wrapping performance is good, a gasket at the position of a compression bolt is not prone to falling off, and time consumed for mounting and dismounting a damping ring connecting piece is shortened; the screw gasket is small in falling risk, high in firmness and smooth in installation process under the moment of 45N. M, and the disassembly and assembly time of the damping ring connecting piece is shortened by more than 2 / 3.

Description

Technical Field

[0001] The utility model relates to the technical field of fastening tools, in particular to a special tool for fastening bolts in a narrow space. Background Art

[0002] Fastening tools are a type of tool used to firmly connect two or more objects together. Common fastening tools include wrenches, such as adjustable wrenches, open-end wrenches, and ring wrenches, which tighten by gripping the edges of bolts or nuts to apply torque.

[0003] The Yinpan Power Station closed busbar is connected to the generator outlet and the low-voltage side bushing of the main transformer by multiple flexible connectors (copper braided belts), of which 48 are used for each phase (a total of 144 for three phases). There are 8 copper silver-plated terminal blocks on the low-voltage bushing side of the main transformer, each of which is equipped with 6 flexible connectors and fixed by 6 M16 bolts. There are 8 aluminum silver-plated terminal blocks on the closed busbar side, each of which is equipped with 6 flexible connectors and fixed by 9 M16 bolts. All bolts are tightened with torque.

[0004] Yinpan Power Station currently has 4 vertical hydro-turbine generator sets. Some of the wave-drying ropes that fix the stator wind shield are loose, causing wear on the ends of the stator wire rods. Due to the tight construction schedule, it is necessary to carry out wire rod wear treatment by pulling out the magnetic poles without lifting the generator rotor. Since the rotor is not lifted, the installation space of the damping ring connecting piece is narrow. One side of the clamping bolt is the stator core, and the two sides are the magnetic pole body. There is space on only one side, and the bolt position is less than two centimeters away from the above side parts. In addition, there are single-ear locking plates on the upper and lower parts of the bolt, and there is locking glue on the thread. The disassembly and assembly of the damping ring connecting piece is extremely difficult. The removal and installation of a single damping ring connecting piece takes more than 1.5 hours. Each unit maintenance requires the disassembly and assembly of 24 damping ring connecting pieces.

[0005] Due to the small space, some of the primary electrical equipment in the Yinpan Power Station, such as the difficulty in tightening the bolts at the soft connection position of the main transformer, requires manual work into the narrow space. Using conventional wrenches poses the risk of mechanical jamming, and screws and gaskets are easy to fall off and the installation tightness is insufficient, resulting in low operating efficiency and difficulty in ensuring the quality of tightening and installation. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a special tool for tightening bolts in a narrow space. According to the stator-rotor gap of the generator set of Yinpan Power Station and the on-site construction conditions, a special tool for disassembling and assembling the rotor damping ring connecting plate without hanging is designed, which shortens the working time for dismantling and installing the damping ring connecting plate and solves the problems of screw washers easily falling off and insufficient installation tightness.

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a special tool for bolt tightening in a narrow space, including a damping ring connecting plate fixed by a threaded fastener, a locking plate installed on the threaded fastener, the folded edge of the locking plate is close to one side of the nut, a sleeve is sleeved on the outer surface of the nut, a J-shaped force rod is installed at the tail of the sleeve, the sleeve cooperates with the nut, and one end of the sleeve is provided with a groove for accommodating the folded edge of the locking plate.

[0008] Further, the central axis of the sleeve is parallel to the vertical portion of the force rod away from the sleeve.

[0009] Furthermore, the square hole of the sleeve is welded to the hook at the top end of the force adding rod.

[0010] Furthermore, the groove of the sleeve is obtained by cutting the edges.

[0011] Furthermore, the sleeve and the force rod are made of galvanized iron.

[0012] The beneficial effects of the utility model are:

[0013] 1. The special tool for tightening bolts in a narrow space is provided with a cut edge treatment on the part of the socket wrench close to the tilted part of the locking plate to form a groove. The tilted part of the locking plate is located in the groove, thereby avoiding the conflict between the socket wrench and the locking plate, and having good wrapping performance, so that it is not easy for the gasket at the clamping bolt to fall off, and reducing the time consumption of installing and removing the damping ring connecting plate. By using a J-shaped socket wrench, the risk of the screw gasket falling off is small, the firmness is high, the installation process of 45N·M torque is smooth, and the removal and installation time of the damping ring connecting plate are shortened by more than 2 / 3, thereby solving the problems of the screw gasket being easy to fall off and the insufficient installation tightness.

[0014] 2. This special tool for tightening bolts in a narrow space has a locking plate, both ends of which are folded, and the two folded directions are set in opposite directions. When the locking plate is tilted, it fits one edge of the hexagonal nut, so that the locking plate can fix the clamping bolt to prevent the clamping bolt from falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is an exploded view of the overall structure of the utility model;

[0017] Figure 3 It is a cross-sectional view of the sleeve and the force rod of the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the locking plate of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the locking plate of the utility model after folding;

[0020] Figure 6 This is a bottom view of the sleeve of the utility model;

[0021] Figure 7 It is a schematic diagram of the structure of the socket and the wrench when they are matched with each other.

[0022] Among them: 1. threaded fastener; 101. nut; 2. damping ring connecting plate; 3. locking plate; 4. sleeve; 5. force rod; 6. groove. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 7, a special tool for tightening bolts in a narrow space, comprising a damping ring connecting piece 2 fixed by a threaded fastener 1, a locking piece 3 is installed on the threaded fastener 1, the folded edge of the locking piece 3 is close to one side of the nut 101, both ends of the locking piece 3 are folded, and the directions of the two folded edges are set in opposite directions, and the locking piece 3 is close to one side of the nut 101 when it is tilted, so that the locking piece 3 fixes the threaded fastener 1 to prevent the gasket at the threaded fastener 1 from falling off, a sleeve 4 is sleeved on the outer surface of the nut 101, and a J-shaped force rod 5 is installed at the tail of the sleeve 4. Since the commonly used disassembly and assembly tools on the market are L-shaped socket 4 wrenches and L-shaped open-end wrenches, L-shaped The sleeve 4 wrench adopts a fully-inclusive sleeve 4. Although the fully-inclusive sleeve 4 can effectively lock the nut, if the cross bar is long, it cannot be opened in the pole gap. If the cross bar is short, the operator needs to lie on the pole and put his hand under the damping ring connecting plate 2 to apply force. As a result, the space is small, the long arm is inconvenient to use, the force arm is short, the force arm is small, the position is low, and the operator's work intensity is high. The L-shaped open-end wrench adopts an open-end wrench folded into an L-shaped design, with an adjustable opening, which is convenient for disassembling and installing screws and applying force. However, the wrench is larger at the nut wrapping part, and the nut is narrow around during construction, making it difficult to adjust the locking angle, easy to slip, and the gasket locking plate 3 is easy to fall. Therefore, a J-shaped design is adopted. The design has a force arm that points vertically upward, making it convenient for operators to apply force. The wrapped sleeve 4 has a strong bite force on the nut. The central axis of the sleeve 4 is parallel to the vertical part of the force rod 5 away from the sleeve 4. The square hole of the sleeve 4 is welded to the hook at the top of the force rod 5. Since the sleeve 4 and the force rod 5 are generally connected by threads on the market, that is, the top of the sleeve 4 and the connection part with the J-shaped force rod 5 are made into a cylindrical shape and connected by threads, although it is easy to disassemble, there is a risk of falling off, which poses certain difficulties for later processing. Therefore, the square hole of the sleeve 4 is welded to the hook at the top of the force rod 5, which is conducive to later processing, has high connection strength, is firm and durable, and the sleeve 4 and the force rod 5 are welded. Galvanized iron material is used. Although stainless steel material is strong and durable, not easy to wear, has strong load-bearing capacity and is moderately priced, it is difficult to process. Although copper material is relatively strong, wear-resistant, not easy to rust, has strong load-bearing capacity and is easy to process, it is expensive. Therefore, galvanized iron material is used, which is not only strong, galvanized and rust-proof, has high plasticity, is easy to process, but also has low cost. The sleeve 4 is matched with the nut 101, and one end of the sleeve 4 is provided with a groove 6 for accommodating the folded edge of the locking plate 3. The groove 6 of the sleeve 4 is obtained by cutting the edge, avoiding the conflict between the sleeve 4 and the locking plate 3, and has good wrapping properties, so it is not easy to cause the gasket at the threaded fastener 1 to fall off.

[0025] Working principle:

[0026] First, both ends of the locking plate 3 are folded, and the directions of the two folded edges are set in opposite directions. When the locking plate 3 is tilted, it fits one edge of the nut 101, so that the locking plate 3 fixes the threaded fastener 1. Then, the sleeve 4 is put on the nut 101, so that the tilted part of the locking plate 3 is located in the groove 6 of the sleeve 4. The groove 6 is set to prevent the sleeve 4 from interfering with the locking plate 3 when it is put on the nut 101. Figure 7 As shown, a spanner is put on the end of the threaded fastener 1 away from the nut 101, and the spanner is twisted to perform tightening work. At this time, the handheld force rod 5 is kept still to prevent the nut 101 from loosening during the rotation of the spanner, so as to facilitate the tightening work, thereby preventing the gasket at the threaded fastener 1 from falling off. The operation is simple and the time for removing and installing the damping ring connecting plate 2 is shortened.

[0027] Next, it should be explained that the force rod 5 is J-shaped. When the sleeve 4 and the force rod 5 are installed, since the commonly used disassembly and assembly tools on the market include L-shaped sleeve 4 wrenches and L-shaped open-end wrenches, the L-shaped sleeve 4 wrenches adopt a surrounding full-coverage sleeve 4. Although the surrounding full-coverage sleeve 4 can effectively lock the nut, if the cross bar is long, it cannot be exerted in the magnetic pole gap. If the cross bar is short, the operator needs to lie on the magnetic pole and put his hand under the damping ring connecting piece 2 to apply force, so the space is small and the length is long. The arm is inconvenient to use, the force arm is short, the force arm is small, the position is low, and the operating intensity of personnel is high. The L-shaped open-end wrench adopts the open-end wrench folded into an L-shape design with adjustable opening, which is convenient for disassembling and assembling screws and applying force. However, the wrench is large at the nut wrapping part, and the nut is narrow around during construction, making it difficult to adjust the locking angle and easy to slip, and the gasket locking plate 3 is easy to fall. Therefore, a J-shaped design is adopted, in which the force arm is vertically upward, which is convenient for operators to apply force, and the wrapped sleeve 4 has a strong bite force on the nut.

[0028] Next, it should be noted that the sleeve 4 and the force rod 5 are made of galvanized iron material. Although stainless steel is strong and durable, not easy to wear, has strong load-bearing capacity and is moderately priced, it is difficult to process. Although copper is relatively strong, wear-resistant, not easy to rust, has strong load-bearing capacity and is easy to process, it is expensive. Therefore, galvanized iron material is used, which is not only strong, galvanized and rust-proof, but also has high plasticity, is easy to process, and has low cost.

[0029] Next, the market generally adopts a threaded connection sleeve 4 and the force rod 5, that is, the top of the sleeve 4 and the connection part with the J-shaped force rod 5 are made into a cylindrical shape. Although the threaded connection is convenient for disassembly, there is a risk of falling off, which poses certain difficulties for subsequent processing. Therefore, the square hole of the sleeve 4 is welded to the hook at the top of the force rod 5, which is conducive to subsequent processing, has high connection strength, and is firm and durable.

[0030] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A special tool for tightening bolts in a narrow space, comprising a damping ring connecting piece (2) fixed by a threaded fastener (1), a locking piece (3) being installed on the threaded fastener (1), the folded edge of the locking piece (3) being in close contact with one side of a nut (101), characterized in that: A sleeve (4) is sleeved on the outer surface of the nut (101), a J-shaped force rod (5) is installed at the tail of the sleeve (4), the sleeve (4) matches the nut (101), and a groove (6) for accommodating the folded edge of the locking plate (3) is opened at one end of the sleeve (4).

2. The special tool for tightening bolts in narrow spaces according to claim 1, characterized in that: The central axis of the sleeve (4) is parallel to the vertical portion of the force-adding rod (5) away from the sleeve (4).

3. The special tool for tightening bolts in narrow spaces according to claim 1, characterized in that: The square hole of the sleeve (4) is welded to the hook at the top end of the force-adding rod (5).

4. The special tool for tightening bolts in narrow spaces according to claim 1, characterized in that: The groove (6) of the sleeve (4) is obtained by cutting edges.

5. The special tool for tightening bolts in narrow spaces according to claim 1, characterized in that: The sleeve (4) and the force adding rod (5) are made of galvanized iron material.

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