CN205743713U - A kind of reaming tool - Google Patents

Abstract

A hole reaming tool relates to a special hole reaming tool for expansion bolts. Including drill pipe (12), drill pipe sleeve (13) and reamer (14), the front end of drill pipe (12) is provided with a centralizing section (24) and a cone section (25), and the front end of the drill pipe sleeve (13) There are strip-shaped cutting holes (16) evenly distributed on the circumferential wall of the pipe wall, and the drill pipe sleeve (13) is set on the front end of the drill pipe (12) and connected by a spline (15). The straight section (19), the rear section is an inclined section (20), and the reamer (14) is placed in the drill pipe sleeve (13), and its blade side can be cut from the strip edge hole (16) of the drill pipe sleeve (13). ) protrudes outward, and the extension part (21) of the reaming knife (14) is covered with an elastic rubber sleeve (22). The back of the reaming knife (14) is attached to the centralizing section (24) and the cone at the front end of the drill pipe (12). on the dough segment (25). It has the advantages of reasonable structure design, simple operation and use.

Description

a reaming tool

technical field

The utility model relates to a hole reaming tool, in particular to a special hole reaming tool designed according to the structural improvement of expansion bolts.

Background technique

Expansion bolts are commonly used parts for fastening and installation in the field of construction. There is a big head at the end of the expansion bolt, and a round pipe slightly larger than the diameter of the bolt is placed outside the bolt. There are several openings at the end. When the bolt is tightened, the tail of the big head is brought into the open pipe to make the pipe bigger. To achieve the purpose of expansion, and then fix the bolts on the ground or wall to achieve the purpose of fastening. The existing expansion bolts are usually designed to bear the force in the radial direction, and the contact mode with the hole is the ring surface of the expansion part, the contact surface is small, and there is a problem of insufficient axial force holding force. When subjected to large axial tension or subjected to frequent axial tension, the wall surface where the hole on the ground or wall contacts the bolt expansion part is easily partially and continuously damaged, and the expansion bolt will loosen and eventually fall off.

Therefore, the inventor improved the structure of the expansion bolt, and provided a reaming tool for the structure of the bolt.

Utility model content

The technical problem to be solved by the utility model is to provide a special hole reaming tool for expansion bolts.

The technical solution of the utility model is: a reaming tool, including a drill pipe, a drill pipe sleeve and a reamer, the front end of the drill pipe is provided with an equal-diameter centralizing section and a tapered section with a small front and a large rear, and the centralizing section The cone section is connected with the rest of the drill pipe. The drill pipe is provided with a spline at the rear of the cone section. The pipe wall of the front section of the drill pipe sleeve is evenly distributed with at least two longitudinal strip-shaped cutting holes in the circumferential direction. The drill pipe sleeve The rear section is provided with a spline groove, and the drill pipe sleeve is set on the front end of the drill pipe and connected with the drill pipe through a spline. The front section of the tool back side of the reamer is a straight section, and the rear section is inclined to match the cone section of the drill pipe. The inclined section of the reaming knife is provided with a forward extension on the back side of the reaming knife and the front end. The reaming knife is placed in the drill pipe sleeve, and its blade side can protrude from the strip edge hole of the drill pipe sleeve. The extension part of the hole cutter is covered with an elastic rubber sleeve, and the back of the reaming cutter is attached to the centering section and the cone section of the front end of the drill pipe. When the drill pipe moves forward, the reamer can be pushed out of the drill pipe casing. The reamer can be retracted into the drill pipe sleeve under the action of the elastic rubber sleeve.

The technical effect of the utility model is: it has the advantages of reasonable structural design, simple operation and use, and the hole is reamed by a special reaming tool, and the hole has a shoulder with a large inside and a small outside, so that the expansion bolt is fixed more reliably and less likely to fall off , which solves the disadvantages of unreliable installation of traditional expansion bolts.

Description of drawings

Fig. 1 is the structural representation of the utility model expansion bolt;

Fig. 2 is a schematic structural view of the reaming tool of the present invention.

detailed description

As shown in Figure 1, an expansion bolt includes a bolt rod 1 and a screw sleeve 2, the rear end of the bolt rod 1 is provided with a force applying part 3 that can be clamped by a force applying tool, and the front end of the bolt rod 1 is provided with a A tapered pipe section 4 with a large front and a small rear, the rear end of the screw sleeve 2 is provided with a nut 5 integrated with the screw sleeve 2, and the rear section of the screw sleeve 2 is provided with an internal thread connection section 6 with an inner diameter smaller than the inner diameter of the rest. There are at least three longitudinal bar-shaped claw holes 7 evenly distributed in the circumferential direction of the tube wall of the front section of the sleeve 2, and claws 8 are arranged in the claw holes 7, and a part of the claws 8 is left in the screw sleeve 2, and the other part can be Protrude from the claw hole 7, the bolt rod 1 is screwed on the threaded connection section 6 of the screw sleeve 2, the rear end of the bolt rod 1 protrudes from the rear end of the screw sleeve 2, and the front end of the bolt rod 1 is placed on the screw sleeve 2, and the taper tube section 4 of its rear end is positioned at the front of claw 8, and when rotating bolt rod 1 makes it continue to move backward, taper tube section 4 will press claw 8 and make it stretch out from card 7 claw holes. The tapered pipe section 4 of the bolt shaft 1 can adapt to the reaction force from the wall of the bolt hole through its own deformation. The part of the claw 8 left in the screw sleeve 2 can be provided with a part longer than the claw hole 7 at the front and rear ends, or a part wider than the claw hole can be set at both sides, so as to prevent the claw 8 from falling out from the hole out.

The front end of the bolt rod 1 is also provided with a flat pipe section 9 in front of the tapered pipe section 4 . The flat pipe section 9 can increase the contact surface with the claw 8, and can provide greater supporting force.

The inner wall of the claw 8 is provided with at least one shoulder 10, so that when the tapered pipe section 4 at the front end of the bolt rod 1 crosses the shoulder 10, a greater pressure can be applied to the wall of the bolt hole. The shoulder 10 can be used to prevent the bolt rod 1 from moving forward, and the pressure exerted by the claw 8 on the wall of the bolt hole can be increased stepwise through the arrangement of the multi-stage shoulder 10 .

The part of the claw 8 that can protrude from the claw hole 7 is provided with a guiding slope 11 at the front end. The guide slope 11 can be used to automatically loosen and return the claw 8 to the screw sleeve 2 under the action of the screw sleeve 2 when the expansion bolt is disassembled.

As shown in Figure 2, the reaming tool includes a drill rod 12, a drill rod sleeve 13 and a reamer 14, and the front end of the drill rod 12 is provided with an equal-diameter centralizing section 24 and a small conical surface section 25 with a small front and a large rear. , the centralizing section 24 is connected with the rest of the drill pipe 12 through the cone section 25, the drill pipe 12 is provided with a spline 15 behind the cone section 25, and there are at least two Longitudinal strip-shaped edge hole 16, drill pipe sleeve 13 rear sections are provided with spline groove 17, drill pipe sleeve 13 is enclosed within the front end of drill pipe 12 and is connected with drill pipe 12 by spline 15, the blade side of reamer 14 is provided with There is a serrated cutting edge 18, the front section of the knife back side is a straight section 19, and the rear section is an inclined section 20 whose inclination is adapted to the conical surface section 25 of the drill rod 12, and the knife back side of the reamer 14 is also provided with a direction to the front end. The front extension part 21, the reaming knife 14 is placed in the drill pipe sleeve 13, and its blade side can extend outward from the strip edge hole 16 of the drill pipe sleeve 13, and the reamer 14 extension part 21 is covered with elastic rubber Cover 22 sticks the back of reaming cutter 14 on the centralizing section 24 and the cone section 25 of the front end of drill rod 12. When the drill rod 12 moves forward, the reaming cutter 14 can be pushed out toward the drill rod sleeve 13. The hole cutter 14 can be retracted into the drill pipe sleeve 13 under the action of the elastic rubber sleeve 22 . The outer wall of the drill pipe sleeve 13 can offer chip removal grooves similar to twist drills to discharge debris in time.

The drill rod 12 is provided with a raised ring platform 23 in front of the spline 15 to prevent the drill rod 12 from coming out of the drill rod sleeve 13 .

When reaming, push the drill pipe hard into the hole, and apply pressure to the reaming knife through the tapered surface to achieve the purpose of reaming.

When installing the expansion bolt, you can use two wrenches to apply force to the bolt rod and the screw sleeve respectively, move the expanded part of the rear end of the bolt rod to the claw, push the claw outward, and the expansion bolt can be tightened on the bolt inside the hole. After the claws are stretched out, the front ends of the claws can abut against the shoulders in the bolt holes, which increases the reliability of installation and increases the tensile force borne in the radial direction. When disassembling the expansion bolt, the bolt shaft can be rotated forward or backward (the back rotation will receive greater resistance), so that the tapered pipe section and the flat pipe section avoid the claws, and then the bolt shaft can be easily disassembled by pulling the bolt shaft outward. Expansion bolts.

Claims (2)

1. A reaming tool, characterized in that it comprises a drill pipe (12), a drill pipe sleeve (13) and a reamer (14), and the front end of the drill pipe (12) is provided with an equal-diameter centralizing section (24 ) and the cone section (25) with a small front and a large rear. Splines (15) are provided at the rear of the drill pipe sleeve (13), and at least two longitudinal strip-shaped cutting holes (16) are evenly distributed on the pipe wall of the front section of the drill pipe sleeve (13). The rear section of the drill pipe sleeve (13) is provided with a spline groove ( 17), the drill pipe sleeve (13) is set on the front end of the drill pipe (12) and connected with the drill pipe (12) through a spline (15), and the front section of the reaming knife (14) is a straight section (19) , the rear section is an inclined section (20) whose inclination is compatible with the cone section (25) of the drill pipe (12), and the back side of the reaming knife (14) is also provided with a forward extension (21) at the front end , the reaming knife (14) is placed in the drill pipe sleeve (13), and its blade side can protrude from the strip edge hole (16) of the drill pipe sleeve (13), and the extension of the reaming knife (14) ( 21) Put the elastic rubber sleeve (22) on the top and attach the back of the reaming knife (14) to the centering section (24) and the cone section (25) at the front end of the drill pipe (12). When the drill pipe (12) moves forward The reamer (14) can be pushed out towards the drill pipe sleeve (13), and when moving backward, the reamer (14) can be retracted in the drill pipe sleeve (13) under the action of the elastic rubber cover (22). 2 . The reaming tool according to claim 1 , characterized in that, the drill rod ( 12 ) is provided with a raised ring platform ( 23 ) in front of its spline ( 15 ).