KR102512025B1 - Hammer-type core drill with striking function - Google Patents

Abstract

The present invention relates to a hammer-type core drill having a hitting function and, more specifically, to a technology of a new concept, which largely improves efficiency of drilling work as a core bit rotates and generates a hitting force caused by a reciprocating pitching movement at the same time. An existing core drill can apply pressure to the core bit but cannot generate the repetitive hitting force like a hammer. Therefore, the existing core causes problems of deterioration of efficiency of the drilling work, a long working time, and deterioration of work quality. To solve the problems, the present invention provides the technique for providing the hammer-type core drill in which the core bit performs the hitting function according to the repetitive forward and backward pitting movements of a pitching rotation wheel connected to a rear end of a pitching spindle at the same time while the pitching spindle connected to the core bit rotates by a reducer connector. The hammer-type core drill comprises the pitching spindle (10), the pitching rotation wheel (20), and a bearing for a hammer (30).

Description

Hammer-type core drill with striking function}

The present invention relates to a technology of a new concept in which the efficiency of drilling work is greatly improved while the core bit rotates and simultaneously exerts striking force by repeated rocking motion.

In general, a core drill is used to drill a concrete structure, rock, etc. while a cylindrical core bit rotates, or to extract a test specimen for strength testing from a concrete structure, etc., an electric motor installed in the drill body, A typical structure is a reduction gear connected to the shaft of the electric motor, a rotation shaft connected to the reduction gear, and a cylindrical bit coupled in front of the rotation shaft.

When the conventional core drill drills a drilling object such as a concrete structure, the drilling operation is performed by the frictional contact of the core bit rotated at high speed with the drilled object, which is simply drilling work with the rotational force of the core drill. In this case, the perforated material having high strength, such as mortar concrete or reinforced concrete, takes a long time to be perforated, resulting in a very large loss of time.

Therefore, the operator works while pressurizing the core drill by applying force toward the object to be drilled.

As a prior art to solve these problems, "Patent Registration No. 1858106, name/ core drill for easy drilling of concrete walls", which is a pre-registered invention of the applicant of the present invention, has been disclosed.

In the prior art, by applying a pressing force to a rotating core bit using an automatic pressing tool mounted on a core drill, the ease of drilling work is improved, as well as reducing working time and reducing worker's fatigue.

This prior art can apply a pressing force to the core bit, but cannot exert a repetitive striking force like a hammer, resulting in problems such as reduced efficiency of drilling work, long working time, and poor work quality.

As a means for solving the above problems, the present invention is a means for solving the above problems, and at the same time as the oscillating spindle connected to the core bit rotates through a reducer connector, the core bit is struck according to the repeated back-and-forth oscillation of the oscillating wheel connected to the rear end of the oscillating spindle. A technology that can provide a hammer-type core drill that demonstrates its function is sought.

In addition, the present invention seeks a technique for connecting the oscillation spindle and the oscillation rotary wheel in a mutually key-coupled manner so as to exhibit solid integrity and smooth rotational force.

In addition, the present invention seeks a technique for improving the smoothness of the oscillation movement while the oscillation wheel moves forward and then returns to the rear by the restoring force of the compression spring.

According to the present invention, the core bit rotates and exhibits a striking function by repeated back and forth rocking motion, so that the core bit performs the role of drilling and hammer in a complex way during drilling work, greatly improving the efficiency of drilling work, It shortens time, improves work quality, and provides the effect of extending the life of the bit blade.

1 is a perspective view of a core bit to which the present invention is applied
2 is a front view of the core bit of the present invention
3 is a partial front cross-sectional view of the core bit of the present invention
Figure 4 is a front cross-sectional view of the installed state of the swinging spindle, the swinging rotation wheel and the bearing for the hammer, which are the main parts of the present invention
5 is a perspective view of the oscillating spindle of the present invention
Figure 6 is an exploded perspective view of the oscillation spindle and the oscillation rotary wheel of the present invention
7 is a front cross-sectional view of the installation state of the rocking rotary wheel and hammer bearing of the present invention
8 is an enlarged cross-sectional view of a state in which the ball is in contact with the rear surface of the rocking rotation wheel of the present invention
9 is an enlarged cross-sectional view of a state in which a ball is in contact with the swing groove of the swing rotation wheel of the present invention.
10 is an exploded perspective view of an oscillating rotation wheel, a ball cage, and a fixed wheel of the present invention
11 is a left side view and a front cross-sectional view of the fixed wheel of the present invention
12 is a left side view, a front view and a right side view of the ball cage of the present invention
13 is a left side view, a front sectional view and a right side view of the rocking rotation wheel of the present invention
Figure 14 is an enlarged cross-sectional view of the installed state of the leak-proof rim and the leak-proof bush of the present invention
15 is an enlarged cross-sectional view of the installed state of the spring support plate and the compression spring of the present invention

It will be described with respect to a preferred embodiment for more specifically implementing the solution to the problem to be solved by the present invention.

Looking schematically at the overall configuration according to the preferred embodiment of the present invention based on the accompanying drawings, it can be seen that it is largely divided into the components of the swinging spindle 10, the swinging wheel 20, and the hammer bearing 30.

Hereinafter, the present invention consisting of the above schematic configuration will be described in more detail to facilitate implementation.

First of all, the core drill (1) of the present invention is to assemble and use the center support bar (2), core bit (3), reducer unit (4), and actuator (5) at the site, the configuration of which is mentioned above As disclosed in detail in the prior art, further detailed descriptions will be omitted in the present invention.

The rocking spindle 10 is installed through the driven gear 4-1 so that it can rotate by receiving the rotational power of the driven gear 4-1 installed inside the reducer unit 4, and the front end has A connector insertion portion 11 is formed, and a spline 12 protrudes outward from the outer circumferential surface, and the spline 12 includes a spline 4-2 protruding inward from the inner circumferential surface of the driven gear 4-1. By interlocking, the oscillating spindle 10 rotates in conjunction with the driven gear 4-1 and can move back and forth at the same time, and the core bit via the reducer connector 6 coupled to the connector insertion part 11. By being connected with (3), the oscillating spindle 10 and the core bit 3 can rotate together.

In the present invention, unlike the conventional technology in which the driven gear 4-1 is integrally formed on the outside of the swinging spindle 10, the swinging spindle 10 is a separate product from the driven gear 4-1. The reason why it is formed is that it is coupled with the mutual splines 4-2 and 12 to rotate in conjunction with the driven gear 4-1 and at the same time to freely slide back and forth while swinging.

An oscillation wheel 20 is integrally connected to the rear end of the oscillation spindle 10, and a plurality of oscillation wheels 20 are spaced apart along the circumferential direction on the rear surface around the support rod through hole 21 formed in the center. The rocking groove 22 is recessed, and the rocking groove 22 is recessed in a curved shape along the circumferential direction as shown in FIG. When contacting the rear surface 23 again after contact, it provides an effect of smoother and smoother contact without rattling or resistance.

The oscillation spindle 10 and the oscillation wheel 20 of the present invention may be connected integrally by penetrating the fastener in a mutually facing state, but the shear force due to the rotational resistance of the core bit 3 concentrates on the fastener and is easily damaged. As a result, technology for actively solving the phenomenon of mutual separation and deterioration in durability is grafted.

As a technical configuration for this purpose, a pair of key grooves 13 are recessed along the circumferential direction at the rear end of the rocking spindle 10, and the pair of key grooves 13 are formed on the front surface of the rocking wheel 20. ) The key 24 fitted into the protrusion is formed, and the fastening hole 25 formed through the front and back of the key 24 and the fastening hole 14 formed in the key groove 13 are penetrated by fasteners such as bolts. By combining, the oscillating spindle 10 and the oscillating rotary wheel 20 can be integrally connected by a mutual key coupling method, thereby maintaining a more robust integrity and eliminating the concentration of shear force during rotation, thereby providing an effect of dramatically improving durability. .

Here, the key 24 is protruded on the same line as the back surface 23 between the oscillation grooves 22, so that the fastening hole 25 formed through the front and rear of the key 24 forms the oscillation groove 22. It is disposed out of position so that the swing groove 22 does not interfere with contact with the ball 32.

On the other hand, the hammer bearing 30 performs a function of allowing the swinging spindle 10 to swing while contacting the swinging wheel 20, and is located at the rear of the swinging wheel 20 as shown in FIG. In addition to being disposed, it is integrally fixed to the plug 4-3 installed on the back of the reducer unit 4.

In addition, the bearing 30 for the hammer rotates the rear surface 23 and the oscillation wheel 20 as shown in FIGS. 8 to 9 in a plurality of balls 32 rotatably accommodated in the ball cage 31. As the grooves 22 alternately contact each other, the rocking rotary wheel 20 reciprocates back and forth while generating repetitive back and forth rocking motion, so that the core bit 3 connected to the rocking spindle 10 can exert a striking function.

Therefore, the core bit (3) rotates and exerts a striking function by repeated back-and-forth rocking motion, so that the core bit (3) performs the role of drilling and hammer in a complex way during drilling work, greatly improving the efficiency of drilling work. provide an effect.

Here, as shown in FIGS. 10 and 13, the rocking rotation wheel 20 can contact the rear surface 23 formed between the rocking grooves 22 along the circumferential direction, respectively, so that the balls 32 do not come into line contact but spherical contact. Since the spherical guide groove 26 is formed so that the oscillation wheel 20 is in spherical contact with the ball 32, it provides an effect of rotating more smoothly without flow in place.

In addition, looking at the specific technical configuration of the hammer bearing 30, the fixed ring 33 closely fixed to the fixing groove 4-4 recessed into the plug 4-3 and formed along the circumferential direction The ball cage 31 in which the balls 32 are accommodated in each of the plurality of ball receiving holes 31-2 is penetrated through the fastener and integrally fixed to the plug 4-3, so that the hammer bearing 30 is firmly fixed. be able to

That is, the fixing wheel 33 has a plurality of ball seating grooves 33-3 along the circumferential direction of the ball insertion part 33-2 formed recessed along the front circumference of the support rod through hole 33-1 formed through the center. A plurality of balls 32 are seated in the ball seating grooves 33-3, respectively, and fastening holes 33-4 are formed between the ball seating grooves 33-3.

In addition, the ball cage 31 has a plurality of ball receiving holes 31-2 formed at intervals along the circumferential direction around the support rod through hole 31-1 formed through the center, and the ball receiving holes 31-2 are formed at intervals. The plurality of balls 32 accommodated in 2) are partially exposed to the front of the ball cage 31, thereby repeatedly contacting the rear surface 23 or the oscillation groove 22 of the rotating oscillation wheel 20, and receiving the balls A fastening hole 31-4 is formed on the rear surface between the holes 31-2 through the front and back of the protruding ball spacing protrusion 31-3.

Therefore, the fastening hole 31-4 of the ball cage 31 and the fastening hole 33-4 of the fixed wheel 33 can be penetrated through the fastening hole to be firmly and integrally fixed to the plug 4-3. .

In addition, in the present invention, a technology for preventing leakage of the lubricant filled between the rocking wheel 20 and the hammer bearing 30 is additionally incorporated.

As a technical configuration for this purpose, the leak-proof rim 40 is integrally fixed to the outside of the rocking rotary wheel 20 as shown in FIG. 42) is inserted, and the O-ring 42 is in close contact with the outer surface of the hammer bearing 30 to provide an effect of preventing leakage of lubricant to the outside.

In addition, both sides of the anti-leakage bush 45 are fitted and fixed into the bush groove 44 formed by penetrating the center of the ball cage 31 and recessed into the inner circumferential surface of the rocking rotary wheel 20 and the inner circumferential surface of the fixed wheel 33. This provides an effect of preventing leakage of the lubricant to the inside.

Meanwhile, in the present invention, after the rocking wheel 20 moves forward, it returns to the rear by the restoring force of the compression spring 55, improving the smoothness of the rocking motion so that the hammer can more smoothly perform its role. New technologies are incorporated.

As a technical configuration for this purpose, the present invention has additionally installed an oscillation spindle 10, an oscillation wheel 20, and a bearing 30 for a hammer, which are new components inside the reducer unit 4, so that the oscillation protrudes further forward. A spindle holder 50 is installed on the front of the reducer unit 4 to accommodate the spindle 10, and the oscillating spindle 10 is rotatably installed inside the spindle holder 50.

And, as shown in FIG. 15, a spring support plate 52 is closely fixed to the bearing 51 inserted into the spindle holder 50, and another spring support plate is attached to the snap ring 53 installed outside the oscillation spindle 10 54) is closely fixed, and between the pair of opposing spring support plates 52 and 54, a compression spring elastically biases the oscillation spindle 10 and the oscillation rotary wheel 20 toward the hammer bearing 30. 55 is installed elastic.

Therefore, the compression spring 55 always elastically biases the oscillation spindle 10 and the oscillation wheel 20 toward the bearing 30 for the hammer, so that the oscillation spindle 10 and the oscillation wheel 20 moved forward It provides a special effect of performing the role of a hammer in a complex way while demonstrating more reliable striking power by improving the smoothness of the rocking movement back and forth by returning it to the rear.

1: core drill 2: center support bar
3: core bit 4: reducer unit
4-1: driven gear 4-2, 12: spline
4-3: plug 5: actuator
10: rocking spindle 11: connector insertion part
13: key groove 20: swinging wheel
22: rocking groove 23: rear
24: key 30: bearing for hammer
31: ball cage 31-2: ball receiving hole
31-3: ball space projection 32: ball
33: fixed wheel 33-2: ball insertion part
33-3: ball seating groove 40: leak-proof rim
42: O-ring 44: Bush home
45: leak-proof bush 50: spindle holder
52, 54: spring support plate 55: compression spring

Claims (6)

It passes through the driven gear 4-1 installed inside the reducer unit 4 and is coupled with the driven gear 4-1 by mutual splines 4-2 and 12 to rotate interlockingly and move forward and backward at the same time, an oscillating spindle 10 connected to the core bit 3 via a reducer connector 6 coupled to the front end;
an oscillation wheel 20 integrally connected to the rear end of the oscillation spindle 10 and having a plurality of oscillation grooves 22 recessed into the rear surface 23 at intervals along the circumferential direction;
A plurality of balls 32 disposed behind the rocking wheel 20, integrally fixed to the plug 4-3 installed on the rear surface of the reducer unit 4, and rotatably accommodated in the ball cage 31 ) The core bit 3 is struck by the repeated back-and-forth rocking motion of the rocking wheel 20 caused by the rotation of the rocking wheel 20 and the rear surface 23 and the rocking groove 22 alternately contacting each other. On the other hand made of a bearing 30 for the hammer to exert the function;
The hammer bearing 30 is a ball cage in which balls 32 are accommodated in a plurality of ball receiving holes 31-2 formed along the fixed wheel 33 and the circumferential direction, which are in close contact with the plug 4-3 ( 31) is passed through the fastener and integrally fixed to the plug 4-3;
The plurality of balls 32 are seated in ball seating grooves 33-3 recessed along the circumferential direction on the front surface of the stationary wheel 33, and are exposed to the front of the ball cage 31 so that the swinging wheel 20 ) Hammer-type core drill with a striking function, characterized in that in contact with the rear surface (23) or the swing groove (22).
delete delete According to claim 1,
The leak-proof rim 40 is integrally fixed to the outside of the rocking wheel 20, and the O-ring 42 fitted into the O-ring groove 41 formed on the rear inner circumferential surface of the leak-proof rim 40 is a hammer bearing ( 30) A hammer-type core drill with a striking function, characterized in that it is in close contact with the outer surface to prevent leakage.
It passes through the driven gear 4-1 installed inside the reducer unit 4 and is coupled with the driven gear 4-1 by mutual splines 4-2 and 12 to rotate interlockingly and move forward and backward at the same time, an oscillating spindle 10 connected to the core bit 3 via a reducer connector 6 coupled to the front end;
an oscillation wheel 20 integrally connected to the rear end of the oscillation spindle 10 and having a plurality of oscillation grooves 22 recessed into the rear surface 23 at intervals along the circumferential direction;
A plurality of balls 32 disposed behind the rocking wheel 20, integrally fixed to the plug 4-3 installed on the rear surface of the reducer unit 4, and rotatably accommodated in the ball cage 31 ) The core bit 3 is struck by the repeated back-and-forth rocking motion of the rocking wheel 20 caused by the rotation of the rocking wheel 20 and the rear surface 23 and the rocking groove 22 alternately contacting each other. On the other hand made of a bearing 30 for the hammer to exert the function;
A pair of key grooves 13 are recessed at the rear end of the swinging spindle 10 along the circumferential direction, and a key fitted into the pair of key grooves 13 on the front side of the swinging wheel 20 ( 24) is protruded, and the swinging spindle 10 and the swinging rotation wheel 20 are integrally connected by mutual key coupling method by penetrating the key 24 and the key groove 13 with fasteners. A hammer-type core drill with
According to claim 1,
The oscillating spindle 10 is rotatably installed inside the spindle holder 50 connected to and installed on the front of the reducer unit 4, and the spring support plate closely fixed to the bearing 51 inserted into the spindle holder 50. Between the oscillation spindle 10 and the oscillation wheel 20 between the spring support plate 54 closely fixed to the snap ring 53 installed outside the oscillation spindle 10, a bearing 30 for a hammer A hammer-type core drill with a striking function, characterized in that the compression spring 55 for elastically biasing is installed.

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