KR102574110B1 - Hammer drill - Google Patents

Abstract

The present invention is (a) a drill body in which a drill bit is rotatably installed at the tip, (b) mounted on the tip of the drill body and wrapped around the outer circumference of the drill bit, fragments generated when drilling a concrete structure with the drill bit It relates to a hammer drill including a receiving portion for accommodating dust and dust, and (c) a slip film coated with a slip composition on the inner surface of the guide portion. Regardless of whether or not it contains more than enough moisture to form, it is slipped along the slip film and accommodated in the corrugated part, so that fragments and dust are not attached to the inner surface of the guide part or only a very small amount are attached to the inner surface of the guide part, and then the guide part is attached to the surface of the concrete structure. It relates to a hammer drill that can show the effect of enabling little or only a small amount of debris and dust to be scattered to the outside of the guide unit when separated from.

Description

Hammer drill for structural safety diagnosis {Hammer drill}

The present invention relates to a hammer drill capable of preventing fragments and dust generated when drilling a concrete structure with a drill bit from scattering.

In general, a concrete structure loses its alkalinity by changing into calcium carbonate while reacting with carbon dioxide gas, which is a phenomenon called carbonation (neutralization) of concrete.

In this way, when carbonation of concrete occurs in a concrete structure, the passivation film surrounding the reinforcing bars embedded in the concrete is destroyed, and corrosion of the reinforcing bars begins, thereby degrading the safety and durability of the concrete structure.

Therefore, in order to diagnose the safety and durability of a concrete structure, it is necessary to detect the carbonation portion of the concrete structure, and a method for detecting the carbonation portion by a conventional hammer drill is usually used.

The method of detecting the carbonation part by a hammer drill drills a concrete structure with a drill bit to form a hole, then sprays a carbonation detection solution into the hole to detect the carbonation part, and then measures the depth of the carbonation part using a measuring device. do.

At this time, a 1% solution of phenolphthalein may be used as the carbonation detection solution. A 1% solution of phenolphthalein causes a colorless reaction in which the color is maintained for the carbonated part of the concrete, but a discoloration reaction in which the color of the non-carbonated part of the concrete is changed to a red color.

Therefore, when a 1% solution of phenolphthalein is sprayed into a hole drilled in a concrete structure with a drill bit, the part where the color is maintained in the hole is the carbonated part, and the part that is discolored in the red series in the hole is the non-carbonated part. Thus, it is possible to detect the carbonated and non-carbonated parts in the hole drilled through the concrete structure with the drill bit.

On the other hand, the detection method of the carbonation part by the hammer drill has a problem in that fragments and dust generated when drilling a concrete structure with a drill bit are scattered to the outside. Since the scattered fragments and dust obstruct the operator's vision and adversely affect the operator's respiratory system, development of various technologies is required to prevent this.

To this end, a technique for slipping debris and dust injected into the guide unit by placing a slip film is also known, but this technology also has a slip film as described above when debris and dust are introduced into the guide unit in a dry state. While the slip action is sufficiently performed, if the debris and dust injected into the guide unit contain more than enough moisture to form small water droplets, there is a problem in that they do not slip properly along the slip film and adhere to the inner surface of the guide unit in a significant amount. It is in need of a solution.

1. Korean Patent Publication No. 10-2018-0126999 2. Korean Patent Publication No. 10-2020-0069401 3. Korean Patent Publication No. 10-2014-0012807

The present invention has been made to solve the above problems, and an object of the present invention is to provide a hammer drill capable of preventing fragments and dust generated when drilling a concrete structure with a drill bit from scattering.

In particular, regardless of whether the debris and dust introduced into the guide unit are dry or contain more than enough moisture to form small water droplets, they are slipped along the slip film and received in the corrugated unit, so that the debris and debris on the inner surface of the guide unit Since dust and dust are not attached or only a very small amount is attached, when the guide part is separated from the surface of the concrete structure, fragments and dust are hardly scattered or only a small amount is scattered to the outside of the guide part. It is to provide a hammer drill that can be.

The present invention (a) a drill body 100 in which the drill bit 120 is rotatably installed at the tip, (b) mounted on the tip of the drill body 100 and wrapped around the outer circumference of the drill bit 120, An accommodating part 200 accommodating fragments and dust generated when drilling the concrete structure 10 with the drill bit 120, and (c) a slip film coated with a slip composition on the inner surface of the guide part 220 As a hammer drill comprising (230); The accommodating part 200 is (b1) a corrugated part 210 mounted on the front end of the drill body 100 and wrapped around the outer circumference of the drill bit 120 and stretchable in the longitudinal direction, (b2) the corrugated part 210 A guide part 220 connected to the front end of the gate part 210 and having a smaller diameter than the corrugated part 210, and (b3) coated with a non-slip composition at the front end of the guide part 220 and the concrete structure 10 ) and a non-slip film 240 in close contact with the surface; The debris and the dust flowing into the front end of the guide part 220 are slipped along the slip film 230 and received in the corrugated part 210; The slip composition contains 10 to 25 parts by weight of a silicone slip agent, 0.5 to 10 parts by weight of a fatty acid amide slip agent, 0.1 to 3 parts by weight of a wax type slip agent, 0.1 to 5 parts by weight of a viscosity modifier, and the following to 100 parts by weight of a polyolefin resin. It relates to a hammer drill characterized by comprising 0.5 to 1 part by weight of 2-hydroxy-5-nitrobenzaldehyde of Formula 1.

Accordingly, the hammer drill according to the present invention has the advantage of being able to prevent fragments and dust from scattering by receiving the fragments and dust generated when drilling a concrete structure with a drill bit into the receiving portion.

In particular, regardless of whether the debris and dust introduced into the guide unit are dry or contain more than enough moisture to form small water droplets, they are slipped along the slip film and received in the corrugated unit, so that the debris and debris on the inner surface of the guide unit Since dust and dust are not attached or only a very small amount is attached, when the guide part is separated from the surface of the concrete structure, fragments and dust are hardly scattered or only a small amount is scattered to the outside of the guide part. .

1 and 2 are schematic views showing a state in which a hammer drill drills a concrete structure according to an embodiment of the present invention.
Figure 3 is a schematic diagram showing a state in which debris and dust are slipped on the slip film of the hammer drill according to another embodiment of the present invention.
4 is a schematic view showing a state in which the non-slip film of the hammer drill is in close contact with the surface of the concrete structure according to another embodiment of the present invention.

Hereinafter, the technical idea of the present invention will be described in more detail using the accompanying drawings.

Since the accompanying drawings are only examples shown to explain the technical idea of the present invention in more detail, the technical idea of the present invention is not limited to the form of the accompanying drawings.

The hammer drill according to the present invention is a device for forming a hole by drilling a concrete structure with a drill bit of a hammer drill in order to detect the carbonation portion of the concrete structure.

1 and 2 are schematic views showing a state in which a hammer drill drills a concrete structure according to an embodiment of the present invention.

As shown in Figures 1 to 2, it includes a drill body 100 and the receiving portion 200 of the hammer drill according to another embodiment of the present invention.

The drill body 100 serves to drive the drill bit 120. A drill chuck 110 is provided at the front end of the drill body 100. The drill bit 120 is restrained in the drill chuck 110, and a drive motor (not shown) for driving the drill chuck 110 is built into the drill body 100.

The drill chuck 110 restrains the drill bit 120 and may include a chuck body provided at the front end of the drill body 100 and a plurality of jaws (not shown) radially installed inside the chuck body.

The chuck body is formed in a cylindrical shape, and a plurality of jaws are radially installed inside the chuck body.

The drill bit 120 is inserted into the plurality of jaws. The plurality of jaws may move in the radial direction to constrain the drill bit 120 or move in the opposite direction to the radial direction to release the drill bit 120 through an internal interlocking mechanism interlocked by rotation of the chuck body. . Here, as the internal interlocking mechanism, a slide and a bearing may be used, and the internal interlocking mechanism of Registered Utility Model Publication No. 20-0426179 may be used.

The drive motor serves to drive the drill chuck 110 in a state where the drill bit 120 is restrained to the drill chuck 110 . The power of the driving motor may be supplied from a secondary battery capable of charging and discharging. The secondary battery may be portablely provided inside the drill body 100 and may be connected to the outside of the drill body 100 by wire.

A handle 130 is provided at the rear end of the drill body 100. The handle 130 is used for the user to grip the drill body 100, and may be formed in a cylindrical shape. A switch 130 for controlling on/off of the driving motor may be provided at the front end of the handle 130 .

For example, the switch 130 may be implemented in such a way that a driving motor is operated while a user presses continuously.

The drill bit 120 is for drilling the concrete structure 10, and is rotated by the driving of a drive motor that drives the drill chuck 110 in a state constrained to the drill chuck 110 to break the concrete structure 10. can be punched

The receiving part 200 is mounted on the front end of the drill body 100 and surrounds the outer circumference of the drill bit 120, and the debris and dust generated when drilling the concrete structure 10 with the drill bit 120 are accommodated. .

Accordingly, in the hammer drill according to the present invention, fragments and dust generated when drilling the concrete structure 10 with the drill bit 120 are accommodated in the receiving portion 200, thereby preventing fragments and dust from scattering. There are advantages to being

The accommodating part 200 may include a corrugated part 210 .

The corrugated part 210 is mounted on the front end of the drill body 100 and wraps around the outer circumference of the drill bit 120, and debris and dust generated when drilling the concrete structure 10 with the drill bit 120 Accepted.

Corrugated portion 210 is formed in the form of a corrugate (corrugate) that can be stretched in the longitudinal direction. Therefore, as the corrugated part 210 shrinks according to the depth of the hole formed when drilling the concrete structure 10 with the drill bit 120, Debris and dust may be accommodated in the corrugated portion 210 .

The corrugated part 210 can be easily stretched in the longitudinal direction and made of a transparent rubber material so that the drill bit 120 can be visually observed.

The corrugated part 210 may be mounted to the front end of the drill body 100 via the flange 300.

Here, the flange 300 may be formed in a ring shape with a hollow inside. Inside the flange 300, the drill chuck 110 is rotatably supported in place, and the corrugated part 210 is fixed to the front of the flange 300. Here, the front of the flange 300 and the corrugated portion 210 may be screwed through a through bolt 310 . Therefore, when the drill chuck 110 is driven by the drive motor, only the drill chuck 110 is rotated in place inside the flange 300.

On the other hand, on one side of the flange 300, the limit rod 400 may be installed forward and backward.

The limit rod 400 is for setting the limit of the depth of the hole formed when drilling the concrete structure 10 with the drill bit 120, and the limit rod 400 has a specific point on one side of the flange 300. In a fixed state, the distance from the tip of the limit rod 400 to the surface of the concrete structure 10 can be set as the limit of the depth of the hole formed when drilling the concrete structure 10 with the drill bit 120. there is.

The limit bar 400 may be pierced through one side of the flange 300 to be able to move forward and backward. And the limit bar 400 may be fixed to one side of the flange 300 by latching or screwing.

The guide part 220 is connected to the front end of the corrugate and adheres to the surface of the concrete structure 10. Therefore, fragments and dust generated when drilling the concrete structure 10 with the drill bit 120 are initially introduced into the guide part 220 .

The guide part 220 may be formed in the shape of a truncated cone smaller than the outermost diameter of the corrugated part 210 . Alternatively, the guide part 220 may be formed in the shape of a truncated cone whose diameter increases as it approaches the surface of the concrete structure 10 .

Therefore, debris and dust introduced into the guide unit 220 can be accommodated in the corrugated unit 210 while slipping along the lower inner surface of the guide unit 220 .

However, when fragments and dust introduced into the guide part 220 are attached to the inner surface of the guide part 220, when separating the guide part 220 from the surface of the concrete structure 10, the guide part 220 ) Debris and dust remaining attached to the inner surface of the guide unit 220 may be scattered to the outside.

In this way, in order to prevent debris and dust attached to the inner surface of the guide unit 220 from scattering, the slip film 230 may be additionally configured according to another embodiment of the present invention.

3 is a schematic diagram showing a state in which fragments and dust are slipped on a slip film of a hammer drill according to another embodiment of the present invention.

As shown in FIG. 3, the hammer drill according to another embodiment of the present invention includes the components of the hammer drill according to one embodiment of the present invention described above, but the slip film 230 may be additionally configured. .

The slip film 230 has a slip action of slipping debris and dust introduced into the guide part 220 along the slip film 230, and the inner surface of the guide part 220 is coated with a slip composition. to be formed

Accordingly, debris and dust introduced into the guide part 220 are slipped along the slip film 230 and are accommodated in the corrugated part 210 . Therefore, since fragments and dust are not attached to the inner surface of the guide part 220 or only a very small amount is attached, thereafter, when separating the guide part 220 from the surface of the concrete structure 10, to the outside of the guide part 220. Little or no scattering of debris and dust may occur.

For example, the slip film 230 may be coated along the inner surface of the guide part 220. In this case, the slip film 230 may be formed in the shape of a truncated cone.

As another example, the slip film 230 may be coated along the lower inner surface of the guide part 220 . In this case, the slip film 230 may be formed in a shape of a truncated cone cut in half.

Meanwhile, the slip composition constituting the slip film 230 contains 10 to 25 parts by weight of a silicone-based slip agent and 0.5 to 10 parts by weight of a fatty acid amide-based slip agent to 100 parts by weight of a polyolefin resin in order to maximize the slip properties of the slip film 230. , 0.1 to 3 parts by weight of a wax-based slip agent, and 0.1 to 5 parts by weight of a viscosity modifier.

The polyolefin resin may be a mixture of polypropylene and polyethylene terephthalate in a weight ratio of 5:5.

The silicone-based slip agent may be at least one selected from the group consisting of silicone acrylate, silicone-modified polyester, polyether-modified polydimethylsiloxane, and silicone oil, and preferably silicone acrylate and polyether-modified polydimethylsiloxane are used in a 3:7 ratio. It may be a mixture mixed in weight ratio.

The fatty acid amide slip agent may be at least one selected from the group consisting of erucic acid amide, caproic acid amide, caprylic acid amide, lauric acid amide, arachidic acid amide, oleic acid amide, palmitic acid amide and stearic acid amide. . Preferably, the fatty acid amide-based slip agent may be stearic acid amide, palmitic acid amide or a mixture thereof, and most preferably may be stearic acid amide.

The wax-based slip agent may be a polyethylene-based wax, a polypropylene-based wax, or a mixture thereof, preferably a polypropylene-based wax.

The viscosity control agent may be mixed to adjust the viscosity of the slip film 230 to form a uniform thickness on the surface of the guide part 220 . The viscosity modifier may be sodium acetate, sodium sulfate or a mixture thereof, preferably sodium sulfate.

As described above, in the present invention, the slip film 230 has a slip action of slipping debris and dust introduced into the guide part 220 along the slip film 230, and through this, the guide part 220 The fragments and dust injected into the inside are slipped along the slip film 230 and received in the corrugated part 210, so that fragments and dust are not attached to the inner surface of the guide part 220 or are attached in very small amounts, and then the guide When the part 220 is separated from the surface of the concrete structure 10, the fragments and dust are hardly scattered or only a small amount can be scattered to the outside of the guide part 220.

However, when debris and dust are introduced into the guide unit 220 in a dry state, the slip film 230 sufficiently performs the slip action as described above, while debris and dust introduced into the guide unit 220 It has been confirmed that when the water droplets contain more than enough moisture to form, they may not slip properly along the slip film 230 and adhere to the inner surface of the guide part 220 in a significant amount. It was confirmed that the composition can be solved by further including 0.5 to 1 part by weight of 2-hydroxy-5-nitrobenzaldehyde based on 100 parts by weight of the polyolefin resin.

Therefore, according to a preferred embodiment of the present invention, the slip composition constituting the slip film 230 includes 10 to 25 parts by weight of a silicone-based slip agent, 0.5 to 10 parts by weight of a fatty acid amide-based slip agent, and a wax-based slip based on 100 parts by weight of a polyolefin resin. 0.1 to 3 parts by weight, 0.1 to 5 parts by weight of a viscosity modifier, and 0.5 to 1 part by weight of 2-hydroxy-5-nitrobenzaldehyde.

As described above, by further including 0.5 to 1 part by weight of 2-hydroxy-5-nitrobenzaldehyde based on 100 parts by weight of the polyolefin resin in the slip composition constituting the slip film 230,

Regardless of whether the fragments and dust introduced into the guide part 220 are dry or contain more than enough moisture to form small water droplets, they are slipped along the slip film 230 and accommodated in the corrugated part 210. By this, fragments and dust are not attached to the inner surface of the guide part 220, or only a very small amount is attached, and then, when the guide part 220 is separated from the surface of the concrete structure 10, the fragments are directed to the outside of the guide part 220. It shows an effect that can act so that the excess dust is hardly scattered or only a small amount can be scattered.

4 is a schematic diagram showing a state in which a non-slip film of a hammer drill is in close contact with the surface of a concrete structure according to another embodiment of the present invention.

As shown in FIG. 4, the hammer drill according to another embodiment of the present invention includes the components of the hammer drill according to one embodiment of the present invention or the components of the hammer drill according to another embodiment of the present invention. Including, but may further include a non-slip film 240.

The non-slip film 240 is coated with a non-slip composition on the tip of the guide part 220, and when the tip of the guide part 220 is in close contact with the surface of the concrete structure 10, the guide part 220 ) acts on the tip of the guide part 220 so that it is non-slip on the surface of the concrete structure 10,

The non-slip film 240 may have a rectangular shape, and a plurality of non-slip film 240 may be radially coated on the front end of the guide part 220 .

The non-slip film 240 may have a ring shape and may be coated along the front end of the guide part 220 .

The nonslip composition constituting the nonslip layer 240 may include 51 to 69 wt% of a binder resin, 20 to 30 wt% of nonslip particles, 5 to 12 wt% of organic beads, and 5 to 8 wt% of a curing agent. Preferably, the nonslip composition may be made of a material containing 58% by weight of a binder resin, 26% by weight of nonslip particles, 10% by weight of organic beads, and 6% by weight of a curing agent.

The binder resin may be at least one selected from the group consisting of polyvinyl chloride, dioctyl terephthalate, polymethyl methacrylate, ethylene vinyl acetate, and elastomer. Preferably, it may be a mixture in which polyvinyl chloride and polymethyl methacrylate are mixed in a weight ratio of 2:1.

The nonslip particles have a particle diameter of 30 to 50 μm, may be at least one selected from the group consisting of aluminum oxide, magnesium oxide, cerium oxide, and silicon carbide, and preferably may be cerium oxide having a particle diameter of 35 to 40 μm.

The organic beads are one or more polymeric materials selected from the group consisting of polypropylene, polyethylene, polyurethane, epoxy, polyester, and nylon, and may have a spherical or polygonal shape with a diameter of 1 to 20 μm. Preferably, the organic beads may be a mixture of spherical polypropylene and polyester having a diameter of 12 to 18 μm.

The curing agent may be hexamethylenetetramine, polyamide or a mixture thereof, preferably hexaketylenetetramine.

The present invention is not limited to the above embodiments, and the scope of application is diverse, and various modifications and implementations are possible without departing from the gist of the present invention claimed in the claims.

10: concrete structure 100: drill body
110: drill chuck 120: drill bit
130: handle 140: switch
200: receiving part 210: corrugated part
220: guide part 230: slip film
240: non-slip membrane 300: flange
310: through bolt 400: limit bar

Claims (2)

(a) a drill body 100 in which a drill bit 120 is rotatably installed at the tip, (b) mounted on the tip of the drill body 100 and surrounding the outer circumference of the drill bit 120 and the drill bit The receiving portion 200 for receiving fragments and dust generated when the concrete structure 10 is drilled with (120), and (c) the slip film 230 coated with the slip composition on the inner surface of the guide portion 220 As a hammer drill containing;
The accommodating part 200 is (b1) a corrugated part 210 mounted on the front end of the drill body 100 and wrapped around the outer circumference of the drill bit 120 and stretchable in the longitudinal direction, (b2) the corrugated part 210 A guide part 220 connected to the front end of the gate part 210 and having a smaller diameter than the corrugated part 210, and (b3) coated with a non-slip composition at the front end of the guide part 220 and the concrete structure 10 ) and a non-slip film 240 in close contact with the surface;
The debris and the dust flowing into the front end of the guide part 220 are slipped along the slip film 230 and are accommodated in the corrugated part 210;
The slip composition includes 10 to 25 parts by weight of a silicone slip agent, 0.5 to 10 parts by weight of a fatty acid amide slip agent, 0.1 to 3 parts by weight of a wax type slip agent, 0.1 to 5 parts by weight of a viscosity modifier, and 2 parts by weight of a polyolefin resin, 100 parts by weight of a polyolefin resin. - Contains 0.5 to 1 part by weight of hydroxy-5-nitrobenzaldehyde,
The non-slip composition is a hammer drill, characterized in that it comprises 51 to 69% by weight of binder resin, 20 to 30% by weight of non-slip particles, 5 to 12% by weight of organic beads and 5 to 8% by weight of a curing agent. delete

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