Temporary fastening device

Abstract

The utility model relates to a kind of temporary fastening device.The temporary fastening device described in the utility model includes: shell, glass bead, elastic glass bead support, guide block, expansion sleeve, stop ring and bolt;The glass bead and elastic glass bead support are filled into the through hole of the radial shell;The guide block is arranged in the shell, and the through hole is provided in axial direction;The expansion sleeve is divided into two symmetrical half expansion sleeves along central axis, two half expansion sleeves are sleeved into the guide block, one end of the expansion sleeve protrudes from the shell, and the expansion sleeve is in contact with the glass bead outside;The bolt is inserted from the axial through hole of the shell, passes through the guide block, the bolt head is provided with annular groove, the stop ring is embedded in the annular groove of the bolt, and the stop ring is in contact with the expansion sleeve.The temporary fastening device described in the utility model adopts rigid working mechanism, and the structure is concentrated closely, clamping is stable, design space is large, is convenient for processing and assembly, cost is low, product life and reliability are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of aerospace assembly technology, and in particular to a temporary fastening device. Background Technology

[0002] In the riveting and assembly of aerospace vehicle outer shell panels, temporary fasteners are typically used as auxiliary links. These temporary fasteners serve to maintain component alignment before riveting and provide a stable working platform for the riveting process, ensuring assembly accuracy and structural stability. Due to the large volume of riveting work, the ease of fastener assembly and disassembly is crucial, and the high number of reusable fasteners places high demands on the lifespan of the equipment and the reliability of the structure.

[0003] Existing temporary fasteners are basically monopolized by foreign companies, and most of them use flexible parts, which have drawbacks such as high import prices, corporate blockade and restrictions on purchases, difficulty in processing flexible parts, difficulty in manufacturing flexible materials, small fastening hole diameter, usually 4mm, high fastening effect standards, small structural design space and difficulty in structural design. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a temporary fastening device.

[0005] A temporary fastening device includes a housing, glass beads, an elastic glass bead holder, a guide block, an expansion sleeve, a stop ring, and a bolt. The housing has several sets of symmetrical through holes radially and an axial through hole along its central axis. The glass beads and the elastic glass bead holder are filled into the radial through holes of the housing. The guide block is disposed inside the housing and has an axial through hole corresponding to the position of the axial through hole of the housing. The expansion sleeve is divided into two symmetrical half-expansion sleeves along its central axis. The two half-expansion sleeves are symmetrically fitted into the guide block from both sides, with one end of the expansion sleeve extending out of the housing and abutting against the glass beads. The bolt extends from the axial through hole of the housing, passes through the guide block, and has an annular groove at its head. The stop ring is embedded in the annular groove of the bolt and abuts against the expansion sleeve.

[0006] The temporary fastening device described in this utility model clamps and fastens the object using two half-expansion sleeves. By rotating the bolts, the stop ring drives the expansion sleeves to move on the guide block, causing the expansion sleeves to open or close. The glass beads and elastic glass bead support provide radial pressure to the expansion sleeves. This temporary fastening device has a more compact and efficient structure with greater design space, facilitating processing and assembly. It optimizes the structure while reducing processing and material costs. The rigid working mechanism significantly reduces product manufacturing difficulty, extends product lifespan, and improves product reliability. It is simple to operate, greatly aiding assembly workers in quickly learning and using it, and significantly improving assembly efficiency and reducing assembly costs.

[0007] Furthermore, the outer casing includes a housing, a front cover, and a rear cover; a set of symmetrical tangent planes are provided in the middle of the surface of the housing, and a plurality of symmetrical through holes are provided in the symmetrical tangent planes; the front cover and the rear cover are respectively disposed on the two end faces of the housing and are fastened to the housing by threads; the axial through hole of the outer casing is provided with a trapezoidal tangent near the front cover.

[0008] Furthermore, it also includes a spring, which is disposed inside the housing near the end of the expansion sleeve that extends out of the housing and is fitted onto the expansion sleeve. The spring provides axial pressure to the expansion sleeve.

[0009] Furthermore, the elastic bead support is a cylindrical shell made of elastic material; the elastic bead support is fitted with the beads and inserted into the radial through hole of the shell by interference fit.

[0010] Furthermore, the guide block is generally square column-shaped, with an inclined surface at one end and the middle, symmetrical to the central reference surface at the front edge, and a trapezoidal tail at the other end. Both sides are flat, and the trapezoidal tail abuts against the rear cover.

[0011] Furthermore, the expansion sleeve is a square sleeve body with a semi-circular arc-shaped non-uniform diameter stepped head extending outward at one end; the sleeve body has a rectangular elongated hole near the head, and the elongated hole has inclined planes near the tail of the sleeve body and at the tail of the sleeve body respectively; the expansion sleeve head extends out of the front cover.

[0012] Furthermore, rubber ring grooves are provided at both ends of the outer surface of the expansion sleeve for placing rubber rings. The rubber rings further provide radial pressure.

[0013] Furthermore, the stop ring is a cuboid structure with a circular stepped opening along the axial direction at the center, and the stepped hole is drilled through one of its sides to form a stepped groove.

[0014] Furthermore, the bolt is a hexagonal bolt with a standard hexagonal bolt head at the tail, a fixed-length thread starting from the tail, the thread not penetrating through, and a column at the front.

[0015] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the temporary fastening device of this utility model;

[0017] Figure 2 This is a top view of the temporary fastening device of this utility model;

[0018] Figure 3 For along Figure 2 The sectional view after cutting along line AA.

[0019] The markings in the diagram are: 1. Housing; 2. Front cover; 3. Rear cover; 4. Glass bead; 5. Elastic glass bead holder; 6. Guide block; 7. Expansion sleeve; 8. Rubber ring; 9. Spring; 10. Stop ring; 11. Bolt. Detailed Implementation

[0020] Please see Figure 1-3 The temporary fastening device of this utility model includes a shell, glass beads 4, elastic glass bead support 5, guide block 6, expansion sleeve 7, spring 9, stop ring 10 and bolt 11.

[0021] The guide block 6 is disposed inside the outer shell. A through hole is provided in the middle of the outer shell and the guide block 6. The expansion sleeve 7 is divided into two halves. The expansion sleeve 7 is fitted into the guide block 6 and is divided into two parts. The head of the expansion sleeve 7 extends out of the outer shell and is used to clamp and fasten objects. The glass bead 4 and the elastic glass bead holder 5 are assembled together and abut against the expansion sleeve 7 to provide radial pressure. The hexagonal bolt 11 passes through the through hole of the guide block 6. The stop ring 10 is fitted with the head of the bolt 11 and abuts against the head of the expansion sleeve 7. By twisting the bolt 11, the stop ring 10 is moved, which in turn moves the expansion sleeve 7, while the guide block remains stationary, so that the head of the expansion sleeve 7 can achieve the clamping and releasing function. The spring 9 is fitted into the head of the expansion sleeve 7 to provide axial pressure.

[0022] The outer casing is cylindrical or other polygonal in shape, including a shell 1, a front cover 2, and a rear cover 3. The front cover 2 and the rear cover 3 are respectively installed on the two end faces of the shell 1, and are circular or polygonal cylinders.

[0023] Furthermore, the front cover 2 and the rear cover 3 are provided with a number of threaded holes on their end faces, which are engaged and fastened to the housing 1 by threaded fasteners.

[0024] The surface of the housing 1 has a set of symmetrical tangent planes at its center, and each symmetrical tangent plane has several symmetrical through holes for accommodating the elastic glass bead support and the glass beads. In this embodiment, the symmetrical tangent planes have three sets of symmetrical through holes.

[0025] The housing 1 has a square through hole along its central axial direction, and two planes of the square through hole are parallel to the external symmetrical tangent plane. The diameter of the square through hole gradually decreases towards the interior of the housing from the end near the rear cover 3. The front cover 2 and the rear cover 3 have corresponding through holes at the positions of the through holes in the housing 1.

[0026] After the elastic bead holder 5 is fitted with the bead 4, it is inserted into the through hole of the outer shell by interference fit. The elastic bead holder 5 is a cylindrical shell made of elastic material.

[0027] The guide block 6 is generally prism-shaped, with an inclined surface at one end and the middle, symmetrical to the central reference surface at the front edge, and a trapezoidal tail at the other end. Both sides are flat, and a through hole is provided in the central part along the axis. The guide block 6 is disposed inside the outer shell near the rear cover 3, with the trapezoidal tail abutting against the rear cover 3. The through hole of the guide block 6 corresponds to the through hole on the rear cover 3. The guide block 6 is used for guiding the expansion sleeve 7.

[0028] The expansion sleeve 7 is divided into two symmetrical half-expansion sleeves along the central axis. The two half-expansion sleeves are symmetrically fitted into the guide block 6 from both sides. One end of the expansion sleeve 6 extends out of the front cover 2, and the outside of the expansion sleeve 6 abuts against the glass beads 4 of the outer shell. After the expansion sleeve 7 is fitted into the guide block 6, the two half-expansion sleeves separate, and the end of the expansion sleeve extending out of the front cover 2 is divided into two parts for clamping and fastening objects.

[0029] Furthermore, the expansion sleeve 7 is a square or other shaped sleeve body, with an outwardly extending semi-circular arc-shaped non-uniform diameter stepped head at one end of the front cover; the sleeve body has a rectangular elongated hole near the head, and the elongated hole has inclined planes near the tail of the sleeve body and at the tail of the sleeve body respectively.

[0030] Furthermore, rubber ring grooves are provided at both ends of the outer side of the expansion sleeve 7 for placing rubber rings 8.

[0031] The spring 9 can be selected as a wave-shaped, butterfly-shaped, or other type of spring depending on the specific situation. In this embodiment, a wave-shaped spring is selected. The spring 9 is disposed inside the outer casing near the front cover 2 and is fitted into the head of the expansion sleeve 7.

[0032] The stop ring 10 is a cuboid structure with a circular stepped hole along the axial direction at the center. The stepped hole is drilled through one of its sides to form a stepped groove, which is used to fix the head of the bolt 11.

[0033] The bolt 11 is a hexagonal bolt with a standard hexagonal bolt head at the tail. A fixed-length thread begins at the tail and does not penetrate the body. The front part is a cylindrical section with an annular groove near the top. The head of the bolt 11 extends into the square through-hole of the rear cover 3 and into the smaller end of the stepped groove of the stop ring 10. The annular groove of the bolt 11 head engages with the stepped groove of the stop ring 10, and the stop ring 10 and the bolt 11 head abut against the head of the expansion sleeve.

[0034] During overall assembly, the elastic ball bearing bracket 5 and the ball bearing 4 are fitted together and inserted into the three sets of through holes in the outer shell using an interference fit. The head of the bolt 11 is engaged with the stop ring 10. The expansion sleeve 7 is symmetrically fitted into the guide block 6 from both sides. The front part of the expansion sleeve 7 is joined together and fitted with the wave spring 9. The middle and rear parts of the expansion sleeve 7 are joined together and fitted with rubber rings 8 respectively. After assembly, the top of the two symmetrical expansion sleeves 7 is parallel to the plane of the outer shell and inserted into the outer shell, so that the outside of the expansion sleeve 7 abuts against the ball bearing 4 of the outer shell. The front cover 2 and the shell 1 are fastened together by threaded fasteners, ensuring that the front part of the combined expansion sleeve 7 is coaxially inserted into the through hole of the front cover 2. The rear cover 3 and the shell 1 are fastened together by threaded fasteners. At the same time as fastening, the trapezoidal part of the tail of the guide block 6 is pressed into the rear inclined surface of the outer shell, completing the assembly.

[0035] In the initial state, the hexagonal bolt 11 reaches the upper limit position, the two symmetrical expansion sleeves 7 return to their positions and merge, the wave spring 9 contracts and presses, the ball bearing 4 is subjected to the pressure of the elastic ball bearing bracket 5, abuts against and presses the middle and rear part of the expansion sleeve 7, at the same time the rubber ring 8 elastically contracts, the outer diameter of the head of the expansion sleeve 7 becomes smaller, making it easier to pass through the through hole on the plate surface.

[0036] In the working state, the two heads of the expansion sleeve 7 are passed through the plate hole, and the head of the hexagonal bolt 11 is rotated counterclockwise, causing the hexagonal bolt 11 to retract axially, which in turn drives the stop ring 10 to retract. The stop ring 10 drives the expansion sleeve 7 to retract axially. During the process, since the bottom of the two expansion sleeves 7 is connected to the inclined surface of the guide block 6, the two expansion sleeves 7 separate radially and retract axially at the same time. During the process, the rubber ring 8 and the ball bearing 4 provide radial pressure, and the wave spring 9 provides axial pressure to ensure the stable movement of the expansion sleeve 7. The relative movement of the rear of the expansion sleeve 7 drives the expansion and contraction of the front, thereby realizing the clamping operation.

[0037] This utility model's temporary fastening device, compared to similar products, transforms the original mechanism inserted into the head into the middle and rear sections through mechanical equivalence, resulting in a more concentrated and compact structure with greater design space, facilitating processing and assembly. This optimizes the structure while reducing processing and material costs. The rigid working mechanism significantly reduces product manufacturing difficulty, extends product lifespan, and improves product reliability. Furthermore, the device is simple to operate, greatly aiding assembly workers in quickly learning and using it, and significantly improving assembly efficiency and reducing assembly costs.

[0038] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A temporary fastening device, characterized in that: The device includes a shell, glass beads, an elastic glass bead holder, a guide block, an expansion sleeve, a stop ring, and bolts. The shell has several sets of symmetrical through holes radially and through holes axially along its central axis. The glass beads and the elastic glass bead holder are filled into the radial through holes of the shell. The guide block is disposed inside the shell and has through holes axially corresponding to the positions of the axial through holes of the shell. The expansion sleeve is divided into two symmetrical half-expansion sleeves along its central axis. The two half-expansion sleeves are symmetrically fitted into the guide block from both sides, with one end of the expansion sleeve extending out of the shell and abutting against the glass beads. The bolts extend from the axial through holes of the shell, pass through the guide block, and have an annular groove at their heads. The stop rings are embedded in the annular grooves of the bolts and abut against the expansion sleeves.

2. The temporary fastening device according to claim 1, characterized in that: The outer casing includes a housing, a front cover, and a rear cover; a set of symmetrical tangent planes are provided in the middle of the surface of the housing, and a number of symmetrical through holes are provided in the symmetrical tangent planes; the front cover and the rear cover are respectively covered on the two end faces of the housing and are fastened to the housing by threads.

3. The temporary fastening device according to claim 1, characterized in that: It also includes a spring, which is disposed inside the housing near the end of the expansion sleeve that extends out of the housing and is fitted into the expansion sleeve.

4. The temporary fastening device according to claim 1, characterized in that: The elastic glass bead holder is a cylindrical shell made of elastic material; the elastic glass bead holder is fitted with the glass beads and inserted into the radial through hole of the shell by interference fit.

5. The temporary fastening device according to claim 2, characterized in that: The guide block is generally square column-shaped, with an inclined surface at one end and the middle, symmetrical to the central reference surface at the front edge, and a trapezoidal tail at the other end. Both sides are flat, and the trapezoidal tail abuts against the rear cover.

6. The temporary fastening device according to claim 2, characterized in that: The expansion sleeve is a square sleeve body with a semi-circular arc-shaped non-uniform diameter stepped head extending outward at one end; the sleeve body has a rectangular elongated hole near the head, and the elongated hole has inclined planes near the tail of the sleeve body and at the tail of the sleeve body respectively; the head of the expansion sleeve extends out of the front cover.

7. The temporary fastening device according to claim 1, characterized in that: The expansion sleeve body has rubber ring grooves at both ends for placing rubber rings.

8. The temporary fastening device according to claim 1, characterized in that: The stop ring is a cuboid structure with a circular stepped opening along the axial direction at the center. The stepped hole is drilled through one of its sides to form a stepped groove.

9. The temporary fastening device according to claim 1, characterized in that: The bolt is a hexagonal bolt with a standard hexagonal bolt head at the tail. A fixed-length thread is provided starting from the tail, but the thread does not penetrate through the bolt. The front part is a column.

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