CN108397460A - Expansion fixing piece - Google Patents

Abstract

The invention discloses an expansion fixing piece which comprises a U-shaped block and a screw rod, wherein the cross section of the U-shaped block is circular, the U-shaped block is in threaded connection with the screw rod, a pressure head is arranged at one end of the screw rod, which is positioned in the U-shaped block, a hexagonal head is arranged at the other end of the screw rod, a wall hole cover in threaded connection is arranged on the screw rod, a pin shaft is arranged at the front end of the U-shaped block, two expansion rods which are symmetrical about the axis of the U-shaped block are arranged in the pin shaft, the expansion fixing piece improves the fastening force by completely embedding four ends of the two expansion rods into a wall body on the side surface of a hole position, compared with the traditional expansion screw which is fixed in the wall body only by friction grip force, the fixing piece has larger fastening force.

Description

an expansion mount

technical field

The invention relates to the field of fasteners, in particular to an expansion fixture.

Background technique

Expansion bolts are a special threaded connection used to fix pipeline supports, hangers, brackets or equipment on walls, floors and columns. When in use, use an impact electric drill to drill holes of corresponding sizes on the fixed body. Then put the bolts and expansion tubes into the holes, and tighten the nuts to make the bolts, expansion tubes, mounting parts and the fixed body tensioned together. The principle of fixing the expansion bolts is to use the inclination of the shape to promote the expansion to generate friction. It is a common threaded connection to achieve the fixing effect, but when the expansion bolt hits a loose wall or the load is heavy, the fastening degree of the expansion bolt is often not good enough for long-term use.

Contents of the invention

The technical problem to be solved by the present invention is to provide an expansion fixture to solve the above-mentioned multiple defects in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions: an expansion fixture, including a U-shaped block and a screw, the U-shaped block has a circular cross-section, and the U-shaped block is threadedly connected with the screw, and the screw is located at One end in the U-shaped block is provided with a pressure head, the other end of the screw is provided with a hexagonal head, the screw is provided with a threaded wall hole cover, and the front end of the U-shaped block is provided with a pin shaft, and the pin shaft There are two expansion rods symmetrical about the central axis of the U-shaped block inside.

Preferably, the front end of the expansion rod is bent toward the rotation direction of the expansion rod.

Preferably, the front end of the U-shaped block is an arc structure.

Preferably, the diameter of the pressure head is 2-3 mm larger than the diameter of the screw.

Preferably, the diameter of the front end of the wall hole cover is 1-2mm larger than the diameter of the U-shaped block.

The beneficial effect of adopting the above technical scheme is: an expansion fixing part of the present invention, the use method of the fixing part is to select a drill bit slightly smaller than the diameter of the U-shaped block, and drill a hole of an appropriate depth on the wall. The depth is 0.8 times the overall length of the fixing piece. Put the fixing piece into the hole. The front end of the U-shaped block is arc-shaped. Hit the hexagonal head with a hammer to make the fixing piece enter the hole until the front end of the wall hole cover completely enters the wall hole. Inside, the diameter of the front end of the wall hole cover is 1-2 mm larger than the diameter of the U-shaped block, and is also larger than the diameter of the drill hole, so that the wall hole cover will not loosen after being knocked in. Use an electric wrench to set it on the hexagonal head, and turn the screw to make the pressure The head is pressed against the expansion rod. As the screw drives the pressure head to enter, the expansion rod stretches into the wall, and the front end of the expansion rod bends in the direction of its rotation, so that the front end of the expansion rod can drill into the wall on the side of the hole and rotate to the hexagonal position. Stop when the head cannot rotate, then put the hanging item on the screw rod outside the wall, and lock it with a nut. This expansion fixture can improve Fastening force, compared with traditional expansion screws that only rely on frictional grip to fix in the wall, the fastening force between the fixing piece and the wall is greater, can bear heavier loads, and is suitable for looser walls.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is a side view of the present invention;

Fig. 3 is a schematic diagram of fixing of the present invention.

Wherein, 1-screw rod, 2-wall hole cover, 3-hexagon head, 4-pressure head, 5-U-shaped block, 6-pin shaft, 7-expansion rod.

Detailed ways

Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Figures 1-3 show a specific embodiment of the present invention: an expansion fixture, including a U-shaped block 5 and a screw 1, the U-shaped block 5 has a circular cross section, and the U-shaped block 5 and the screw 1 are screwed together, One end of the screw rod 1 located in the U-shaped block 5 is provided with a pressure head 4, and the other end of the screw rod 1 is provided with a hexagon head 3, and the screw rod 1 is provided with a threaded wall hole cover 2, and the U-shaped block The front end of the 5 is provided with a pin shaft 6, and two expansion rods 7 symmetrical to the central axis of the U-shaped block 5 are arranged inside the pin shaft 6 .

In this embodiment, the front end of the expansion rod 7 is bent toward the rotation direction of the expansion rod 7 .

In this embodiment, the front end of the U-shaped block 5 is an arc-shaped structure.

In this embodiment, the diameter of the pressure head 4 is 2-3 mm larger than that of the screw 1 .

In this embodiment, the diameter of the front end of the wall hole cover 2 is 1-2 mm larger than that of the U-shaped block 5 .

Based on the above, a kind of expansion fixture of the structure of the present invention, the use method of this fixture is, selects the drill bit slightly smaller than U-shaped block 5 diameters, drills the hole position of appropriate depth on the body of wall, and the hole position depth is 0.8 times the overall length, put the fixing piece into the hole, the front end of the U-shaped block 5 is arc-shaped, hit the hexagonal head 3 with a hammer, the fixing piece can enter the hole, until the front end of the wall hole cover 2 completely enters the wall hole , the diameter of the front end of the wall hole cover 2 is 1-2mm larger than the diameter of the U-shaped block 5, and is also larger than the diameter of the drilled hole, so that the wall hole cover 2 will not loosen after being knocked in. Use an electric wrench to set it on the hexagonal head 3 and turn the screw. 1. Press the pressure head 4 to the expansion rod 7. With the entry of the pressure head 4 driven by the screw 1, the expansion rod 7 stretches into the wall, and the front end of the expansion rod 7 bends in the direction of its rotation, so that the front end of the expansion rod 7 can drill The wall on the side of the hole is turned until the hexagonal head 3 cannot be rotated, and then the hanging object is placed on the screw 1 outside the wall and locked with a nut. All four ends of the expansion screw are embedded in the wall on the side of the hole to improve the fastening force. Compared with the traditional expansion screw, which is fixed in the wall only by friction and gripping force, the fastening force between the fixing piece and the wall is greater, and it can Holds heavier loads and is suitable for looser walls.

The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the inventive concept of the present invention, some modifications and improvements can also be made, and these all belong to the present invention. protection scope of the invention.

Claims (5)

1. An expansion fixture, characterized in that: comprise a U-shaped block and a screw rod, the U-shaped block section is circular, the U-shaped block and the screw rod are threaded, and the screw rod is positioned at one end of the U-shaped block. There is a pressure head, the other end of the screw is provided with a hexagonal head, the screw is provided with a threaded wall hole cover, the front end of the U-shaped block is provided with a pin shaft, and the pin shaft is provided with two about U An expansion rod symmetrical to the central axis of the shape block. 2. The expansion fixture according to claim 1, characterized in that: the front end of the expansion rod is bent toward the rotation direction of the expansion rod. 3. The expansion fixture according to claim 1, characterized in that: the front end of the U-shaped block is an arc-shaped structure. 4. The expansion fixture according to claim 1, characterized in that: the diameter of the pressure head is 2-3mm larger than the diameter of the screw rod. 5. The expansion fixture according to claim 1, characterized in that: the diameter of the front end of the wall hole cover is 1-2 mm larger than the diameter of the U-shaped block.