Special tool for disassembling and assembling fixing bolt in narrow space

Abstract

The utility model provides a special tool for disassembling and assembling a fixing bolt in a narrow space, and solves the technical problems that when the fixing bolt in the narrow space is disassembled and assembled in the prior art, time and labor are wasted, a product is easy to slip and damage, and the repair quality is influenced. The tool comprises a handle, a wrench head and a fastening assembly. A first connecting through hole is formed in one end of the handle; handle wall surfaces where upper and lower orifices of the first connecting through hole are located are planes, and one side is provided with a groove along the wall surface; the wrench head is Z-shaped and comprises a connecting section, a transition section and an operation section; a second connecting through hole is formed in the connecting section, one end of the connecting section can be tightly attached to the wall face of the handle to be inserted into the groove in a matched mode, the other end of the connecting section is perpendicularly connected with one end of the transition section, the other end of the transition section is perpendicularly connected with one end of the operation section, and an opening matched with the fixing bolt is formed in the other end of the operation section; the fastening assembly combines the handle and the wrench head into a whole through the first connecting through hole and the second connecting through hole.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology, specifically relating to a special tooling for disassembling and assembling fixing bolts in narrow spaces. Background Technology

[0002] Emergency fuel dump valve for a certain type of aircraft (see details) Figure 1 During the disassembly and assembly of the inner ring bolt, the large protrusion of the valve and the large diameter of the bolt's cross-section, coupled with the smaller diameter of the inner ring, cause the bolt to be sandwiched between the valve and the inner ring. When using a standard 9 mm × 11 mm wrench for disassembly and assembly, the narrow operating space and the 15° angle between the open-end wrench head and the handle necessitate repeated wrench rotations to ensure the wrench head contacts the bolt head. Furthermore, the wrench's maximum operating range is only 30°. With over a dozen such bolts on each aircraft, this requires over 200 repeated tightenings, which is extremely time-consuming. Repeatedly rotating the wrench not only severely impacts the operator's mood but also, due to the small contact area between the wrench head and the bolt, causes slippage, easily damaging the part's surface and preventing the bolt from being fully tightened. This hinders repair progress and severely affects product repair quality.

[0003] For the reasons mentioned above, it is necessary to design a special tooling to improve the quality and efficiency of disassembling and assembling bolts in confined spaces. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing methods for disassembling and assembling bolts in narrow spaces, which are time-consuming, labor-intensive, and prone to slippage and damage to products, thus affecting repair quality. This invention provides a special tooling for disassembling and assembling bolts in narrow spaces.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A special tooling for disassembling and assembling fixed bolts in confined spaces, characterized in that it includes a handle, a wrench head, and a fastening assembly;

[0007] The handle has a first connecting through hole along the thickness direction at one end; the handle wall surfaces where the upper and lower openings of the first connecting through hole are both flat (that is, the upper and lower surfaces of the handle end with the first connecting through hole are both flat, which facilitates the subsequent insertion of the wrench head connection section and the effective fit of the fastener with the handle and the wrench head, which is conducive to fastening), and a groove is opened along one side of the wall surface.

[0008] The wrench head is Z-shaped and includes a connecting section, a transition section, and a working section. The connecting section has a second connecting through hole along its thickness direction (this second connecting through hole is coaxial with the first connecting through hole after the connecting section is inserted into the handle groove). One end of the connecting section can fit snugly against the handle wall and be inserted into the groove. The other end of the connecting section is perpendicularly connected to one end of the transition section, and the other end of the transition section is perpendicularly connected to one end of the working section. The other end of the working section has an opening adapted to the fixing bolt. Thus, it can be seen that the wrench head is a Z-shaped straight wrench.

[0009] The fastening assembly integrates the handle and the wrench head into one unit through the first connecting through hole and the second connecting through hole.

[0010] Furthermore, in order to make the connecting section of the wrench head more compatible with the handle and to apply force smoothly, the groove is a flat-bottomed U-shaped groove.

[0011] Furthermore, in order to improve the efficiency of tooling assembly and disassembly, the fastening components include bolts and nuts.

[0012] Furthermore, to increase hand friction and facilitate the operator's application of force when using this tool, the handle's grip area is knurled. The handle size can be designed according to the operator's hand size and gripping habits.

[0013] Furthermore, both the first connecting through hole and the second connecting through hole are threaded holes;

[0014] The bolts are M4 bolts; the nuts are M4 nuts.

[0015] Furthermore, to ensure fastening strength, the bolts are made of 30CrMnSiA steel and the nuts are made of 45 steel.

[0016] Furthermore, to ensure that no deformation occurs during long-term use, both the wrench head and handle undergo heat treatment, achieving a tensile strength of σ. b ≥900.

[0017] Furthermore, to prevent the tooling from rusting, the surfaces of the wrench head and handle are bluing.

[0018] The advantages of this utility model are:

[0019] 1. This utility model features a simple special tooling structure. The wrench head adopts a Z-shaped straight wrench head, which not only increases the turning angle and facilitates the operator's observation, but also allows the wrench head opening to effectively fit with the fixing bolt, expanding the operating space beyond the product. During use, it does not interfere with the protruding part of the valve, and the operating range is three times that of the original, making it easier for the operator to apply force and increasing work efficiency by at least three times. When using this tooling to disassemble or assemble fixing bolts in narrow spaces, the wrench does not need to be reversed, making operation simpler and improving the efficiency of disassembling and assembling emergency drain valve bolts. It also ensures no damage to the surface of parts, achieving the effect of simple and convenient operation, saving time and effort, while saving costs, ensuring product repair quality, and providing ideas and methods for the repair of similar products.

[0020] 2. This utility model uses bolts and nuts as fasteners, which facilitates the disassembly and replacement of wrench heads. Similar products can also use wrench heads of different specifications according to the size of the fixing bolt (i.e., using different sizes of openings to match the fixing bolt), thus expanding the range of applications. Attached Figure Description

[0021] Figure 1 Diagram of an emergency oil release valve;

[0022] Figure 1 The attached diagram is labeled as follows: 01-Valve; 02-Inner ring; 03-Bolt;

[0023] Figure 2 Schematic diagram of special tooling Figure 1 ;

[0024] Figure 3 Schematic diagram of special tooling Figure 2 ;

[0025] Figure 4 Schematic diagram of the wrench head structure Figure 1 ;

[0026] Figure 5 Schematic diagram of the wrench head structure Figure 2 ;

[0027] Figure 6 This is a schematic diagram of the handle structure.

[0028] Figures 2-6 The labels in the attached diagram are: 1-wrench head; 2-bolt; 3-nut; 4-handle; 5-knurling. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0030] For convenience only, specific directional terms are used in the following description with reference to the corresponding drawings. This should not be considered as a limitation of the present invention. When the defined directions in the drawings change, the directions indicated by these terms should be interpreted as the corresponding different directions.

[0031] like Figures 2-6 As shown, a special tooling for disassembling and assembling fixed bolts in confined spaces includes a wrench head, a handle, and a fastening assembly, wherein the fastening assembly uses an M4 bolt and an M4 nut.

[0032] A special tooling for disassembling and assembling fixed bolts in confined spaces, comprising a handle, a wrench head, and a fastening assembly;

[0033] One end of the handle has a first connecting through hole along its thickness direction; the handle wall surfaces where the upper and lower openings of the first connecting through hole are both flat (i.e., the upper and lower surfaces of the end of the handle with the first connecting through hole are flat, facilitating the insertion of the wrench head connection section and ensuring effective contact between the fastener and the handle and wrench head for tightening). A flat-bottomed U-shaped groove is formed along one side of the wall surface (to better fit the wrench head connection section with the handle and ensure stable force application, the bottom of the U-shaped groove is flat, and its size is determined according to the dimensions of the wrench head connection section). To increase hand friction and facilitate hand application of force when using this tool, the handle's grip area is knurled. The handle size can be designed according to the operator's hand size and gripping habits.

[0034] The wrench head is a Z-shaped straight wrench, which fits the handle with a clearance. It includes a connecting section, a transition section, and a working section. The connecting section has a second connecting through hole along its thickness direction (this second connecting through hole is coaxial with the first connecting through hole after the connecting section is inserted into the handle groove). One end of the connecting section can fit snugly against the handle wall and be inserted into a flat-bottomed U-shaped groove. The other end of the connecting section is perpendicularly connected to one end of the transition section, and the other end of the transition section is perpendicularly connected to one end of the working section (that is, the connecting section and the working section are respectively perpendicularly set at both ends of the transition section, and the connecting section and the working section are also perpendicularly connected).

[0035] Both the first and second connecting through holes are threaded holes. The size of the threaded holes is determined according to the M4 bolt. The M4 bolt and M4 nut combine the handle and the wrench head into one unit through the first and second connecting through holes.

[0036] The wrench head and handle mentioned above are both made of 45# steel, and have undergone quenching and bluing treatment, with a tensile strength of σ. bThe temperature is ≥900°C and it is not easy to rust. The M4 bolt is made of 30CrMnSiA steel and the M4 nut is made of 45 steel. The total length of the wrench is 150mm, which is convenient for applying force. The total length of the wrench head is 23mm and the Z-shaped height is 11mm, which can prevent contact with the protruding valve during use.

[0037] When using the special tooling of this utility model, first place the product on the workbench, insert the wrench head into the inner ring, support the product with one hand for the emergency oil release valve, and hold the special tooling handle with the other hand. The opening of the wrench head should be effectively fitted with any pair of sides of the fixing bolt. The disassembly and assembly of the bolt can be easily completed by applying force with the hand.

[0038] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any operator skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A special tool for disassembling and assembling a fixing bolt in a narrow space, characterized in that: Includes handle, wrench head, and fastening components; The handle has a first connecting through hole along the thickness direction at one end; the handle wall surfaces where the upper and lower openings of the first connecting through hole are located are both flat, and a groove is formed along one side of the wall surface. The wrench head is Z-shaped and includes a connecting section, a transition section, and a working section. The connecting section has a second connecting through hole along its thickness direction, and one end of the connecting section can fit snugly against the handle wall and be inserted into the groove. The other end of the connecting section is perpendicularly connected to one end of the transition section, and the other end of the transition section is perpendicularly connected to one end of the working section. The other end of the working section has an opening that fits the fixing bolt. The fastening assembly integrates the handle and the wrench head into one unit through the first connecting through hole and the second connecting through hole.

2. The special tooling for disassembling and assembling fixing bolts in confined spaces according to claim 1, characterized in that: The groove is a flat-bottomed U-shaped groove.

3. The special tooling for disassembling and assembling fixing bolts in confined spaces according to claim 1, characterized in that: Both the first and second connecting through holes are threaded holes; The fastening components include bolts and nuts.

4. The special tooling for disassembling and assembling fixing bolts in confined spaces according to claim 1, characterized in that: The handle has a knurled surface on the grip area.

5. The special tooling for disassembling and assembling fixing bolts in confined spaces according to claim 3, characterized in that: The bolts are M4 bolts; the nuts are M4 nuts.

6. The special tooling for disassembling and assembling fixing bolts in confined spaces according to claim 5, characterized in that: The bolts are made of 30CrMnSiA steel, and the nuts are made of 45 steel.

7. The special tooling for disassembling and assembling fixing bolts in confined spaces according to claim 1, characterized in that: The wrench head and handle are both heat treated, with a tensile strength of σ b ≥ 900.

8. The special tooling for disassembling and assembling fixing bolts in confined spaces according to claim 7, characterized in that: Both the wrench head and handle surfaces are bluing treated.

Images