CN113172496A

CN113172496A - Grinding tool for grinding tapered hole at root of mounting hole of expansion bolt

Info

Publication number: CN113172496A
Application number: CN202110595451.4A
Authority: CN
Inventors: 胡洪新
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-29
Filing date: 2021-05-29
Publication date: 2021-07-27

Abstract

The grinding tool of expansion bolts mounting hole root grinding bell mouth, toper bistrique dress are at the lower extreme of mobile jib, and the middle part of mobile jib is the screw thread, through lock nut down with go up lock nut with the positioning disk locking on the mobile jib, the upper end of mobile jib is a supporting rod, presss from both sides tight supporting rod with electric drill or electric grinder and drives toper bistrique high-speed rotatory, carries out the grinding to concrete hole inner wall to processing out the bell mouth. The grinding tool changes the prior mode of scraping concrete by the drill bit into the mode of grinding by the grinding head, and has the advantages of simple structure, convenient use, high efficiency, labor saving, low cost and easy operation. The tapered hole can be easily ground in the concrete hole, and the depth from the ground tapered hole to the top surface of the concrete can be conveniently and accurately adjusted.

Description

Grinding tool for grinding tapered hole at root of mounting hole of expansion bolt

Technical Field

The invention relates to a grinding tool for grinding a tapered hole at the root of an expansion bolt mounting hole with a tapered stress surface, which is manufactured at the root of a cylindrical hole drilled by an electric hammer or other tools when an expansion bolt is arranged on concrete for field use.

Background

The existing tools for manufacturing the conical stress surface in the inner cylindrical hole of the concrete have two types: one is that the head of the drill bit is provided with an expandable cutter head, the cutter head opens outwards in an umbrella shape while the drill bit rotates, and the drill bit rotates to cut the concrete at the root of the mounting hole, so that a conical stress surface is formed on the wall of the hole. Since the diameter of the mounting bore is not large, it is conceivable to provide such a drill with an expandable movable bit. The concrete not only has hardness, but also the sand grains are grinding materials, and have extremely strong grinding effect on the cutting edge of the cutter head, so the cutter head is required to have extremely high hardness and ultra-strong wear resistance. The disadvantages are that: the manufacturing process is complex, the cost is high, and the service life is short. The basic structure of another drill bit is similar to that of a common percussion drill bit, except that two side surfaces of a sintered tungsten steel sheet of the head of the common percussion drill bit are made into a conical shape, and a spherical protrusion is made in the middle of the drill bit and used as a fulcrum when the conical side surfaces are scraped. The upper part of the drill bit is provided with a positioning disc for controlling the depth of the scraped conical side surface, but the positioning disc has no function of adjusting the depth. The advantages are that: the structure is simpler. The disadvantages are that: when the drill bit is used for machining the conical side face, the rotary function of the electric hammer is used, and the impact function cannot be used. People who have used electric hammers know: when the impact drill is used for drilling holes in concrete, if impact force is not used, the electric hammer cannot be used for full pressure to smoothly drill the holes even if the impact force is used up, and the drill bit is used for drilling the holes by rotating the drill bit, namely, drilling the holes, namely, scraping the holes. It is quite difficult to use a tungsten steel bit to shave a tapered side on the side of the concrete. And the positioning disc has no adjusting function, one drill bit can only be matched with one depth, and the utilization rate of the tool is not high.

Disclosure of Invention

The purpose of the invention is: the inner hole grinding tool is simple in structure, convenient to use, efficient and labor-saving, can easily grind a conical hole in a concrete hole, and can conveniently and accurately adjust the depth of the grinding conical hole.

The technical scheme adopted by the invention is as follows: the invention relates to a grinding tool for grinding a taper hole at the root of an expansion bolt mounting hole, which comprises the following components: the grinding wheel comprises a main rod, a conical grinding head, a positioning disc arranged on the main rod, a lower locking nut and an upper locking nut. The lower extreme at the mobile jib is adorned to the toper bistrique, and the middle part of mobile jib is the screw thread, locks the positioning disk locking on the mobile jib through lock nut down with last lock nut, and the upper end of mobile jib is a holding rod, presss from both sides tight holding rod with electric drill or electric grinder and drives the high-speed rotation of toper bistrique, carries out the grinding to concrete hole inner wall to processing goes out the bell mouth.

Drawings

Fig. 1 is a structural view of a grinding tool for grinding a tapered hole at the root of an expansion bolt mounting hole.

Fig. 2 is a state view of a grinding tool for grinding a tapered hole at the root of an expansion bolt mounting hole in a concrete inner hole.

In the attached fig. 1: fig. one is an assembly state diagram of a grinding tool for grinding a tapered hole at the root of an expansion bolt mounting hole, fig. two is an enlarged structural diagram of a positioning plate, fig. three is an enlarged structural diagram of a tapered grinding head, and fig. four is a structural state diagram of a main rod.

In fig. 2: fig. five is a view showing a state where the grinding tool for grinding the taper hole at the root of the expansion bolt mounting hole is inserted into the expansion bolt mounting hole, and fig. six is a view showing a state where the grinding tool for grinding the taper hole at the root of the expansion bolt mounting hole is ground.

Detailed Description

The invention relates to a grinding tool for grinding a conical hole at the root of an expansion bolt mounting hole, wherein a main rod (1) is a metal rod-shaped body, an internal thread hole (10) is formed in the bottom of the main rod (1), a thread (2) is arranged in the middle of the main rod, a clamping rod (3) clamped by an electric hand drill or an electric grinder is arranged at the top of the main rod, and the outer diameter of the clamping rod (3) is smaller than the small diameter of the thread (2) in the middle of the clamping rod. The upper end of the conical grinding head (8) is provided with a thread (11), a section of cylinder is arranged below the thread (11), a cone (9) is arranged below the cylinder, a section of cylinder (12) is arranged below the cone (9), the side surfaces of the cone (9) and the cylinder (12) are provided with chip grooves (16), the chip grooves (16) can be vertically arranged or obliquely arranged, the side surfaces of the cone (9) and the cylinder (12) are covered with a layer of diamond grit by an electroplating or sintering method, and the high hardness and sharpness of the diamond grit are used for grinding the concrete on the hole wall.

The positioning disc (7) is similar to a funnel shape, the upper end of the positioning disc (7) is in interference fit with the bearing (6), the outer diameter of the lower end of the positioning disc is smaller than the expansion bolt mounting hole (13), and the inner diameter of the positioning disc is larger than the diagonal distance of the lower locking nut (5). The external dimension of the lower lock nut (5) is smaller than the external dimension of the standard nut of the middle thread (2) by one specification due to the restriction of the spatial position of the lower lock nut (5), for example: the nominal size of the middle thread (2) is 10 mm, and the external shape of the nut is made into the standard size of the nut of 8 mm; the nominal size of the middle thread (2) is 8 mm, and the appearance of the nut is made into the standard size of the nut of 6 mm; the nominal size of the middle thread (2) is 6 mm, and the external shape of the nut is made into the standard size of the nut with 5 mm. The lower lock nut (5) and the upper lock nut (4) lock the inner ring of the bearing (6) on the main rod (1) in a positioning way.

When assembling: the thread (11) of the conical grinding head (8) is screwed into the internal thread hole (10) at the bottom of the main rod (1), and then two lower locking nuts (5) are installed, and the two lower locking nuts (5) are mutually screwed. Then a positioning disc (7) is sleeved, an upper lock nut (4) is mounted and screwed, and the inner ring of the bearing (6) is positioned and locked on the main rod (1).

When the lengths of the expansion bolts with the same nominal diameter are different, the positions of the two lower locking nuts (5) on the main rod (1) are adjusted. In the use process, after the diamond grit on the side of the conical grinding head (8) falls off to a certain degree, the conical grinding head (8) is unscrewed from the main rod (1), and only one conical grinding head (8) is replaced.

When in use: the grinding depth is adjusted, the clamping rod (3) on the main rod (1) is clamped by a chuck of an electric hand drill or an electric grinder, the conical grinding head (8) is extended into a drilled expansion bolt mounting hole (13) on the concrete (14), and the lower end of the positioning disc (7) is inserted into the expansion bolt mounting hole (13) until the positioning disc (7) is attached to the surface of the concrete (14). Starting the electric hand drill or the electric grinder, turning the electric hand drill or the electric grinder outwards and slowly making a circumferential rotation, wherein at the moment: the conical grinding head (8) cuts into the inner side of the expansion bolt mounting hole (13), because the thread (11) on the conical grinding head (8) is a section of cylinder which is tightly attached to the inner wall of the expansion bolt mounting hole (13) and limits the grinding radius of the conical grinding head (8). After one revolution, the grinding of the tapered hole (15) is finished.

Compared with the prior art, the method changes the prior method of scraping concrete by using the drill into the method of grinding concrete by using the grinding head, and the method is very easy to grind concrete by using the diamond grinding head. The grinding tool has the advantages of simple structure, convenient use, high efficiency, labor saving, low cost and easy operation. The tapered hole can be easily ground in the concrete hole, and the depth from the ground tapered hole to the top surface of the concrete can be conveniently and accurately adjusted.

Claims

1. The grinding tool for grinding the taper hole at the root of the mounting hole of the expansion bolt comprises a main rod (1) and is characterized in that: the bottom of the main rod (1) is provided with an internal threaded hole (10), and the conical grinding head (8) is arranged at the bottom of the main rod (1) through the internal threaded hole (10); the middle part of the main rod (1) is provided with threads (2), and the positioning disc (7) positions and locks the inner ring of the bearing (6) on the main rod (1) through the lower locking nut (5) and the upper locking nut (4); the top of the main rod (1) is provided with a clamping rod (3) clamped by an electric tool.

2. The grinding tool for grinding a tapered hole at the root of an expansion bolt mounting hole according to claim 1, wherein: the upper end of the conical grinding head (8) is provided with a thread (11).

3. The grinding tool for grinding a tapered hole at the root of an expansion bolt mounting hole according to claim 1, wherein: the side surfaces of the cone (9) and the cylinder (12) of the conical grinding head (8) are provided with chip grooves (16).

4. The grinding tool for grinding a tapered hole at the root of an expansion bolt mounting hole according to claim 1, wherein: the upper end of the positioning disc (7) is in interference fit with the bearing (6), the outer diameter of the lower end of the positioning disc is smaller than that of the expansion bolt mounting hole (13), and the inner diameter of the positioning disc is larger than the diagonal distance of the lower locking nut (5).

5. The grinding tool for grinding a tapered hole at the root of an expansion bolt mounting hole according to claim 4, wherein: the external dimension of the lower locking nut (5) is one specification smaller than that of a standard nut with a middle thread (2).