JP7693171B2 - drilling machine - Google Patents

Description

The present invention relates to a drilling machine for drilling pipes.

Conventionally, a drilling machine is known that has a plurality of motors each generating a rotational driving force that is driven independently of each other, and outputs the rotational driving force generated by each of the plurality of motors on the same axis (for example, Patent Document 1). Such a drilling machine includes a first member having a first threaded portion with a predetermined pitch centered on the axis and rotating around the axis based on the rotational driving force output from the motor, a second member having a second threaded portion that screws with the first threaded portion and rotating around the axis based on the rotational driving force output from another motor, and a motor controlled according to the positional relationship between the pipe and the cutting tool, and the feed pitch is determined for each rotation of the cutting tool based on the relative rotational motion of these and the pitch of the screw. This makes it possible to control the rotation speed and feed speed of the cutting tool while suppressing the increase in size of the device.

In addition, the drilling machine disclosed in Patent Document 1 is provided with a movable anti-vibration part on the outer periphery of the spindle. By providing this movable anti-vibration part, it is possible to prevent the spindle from wobbling.

JP 2018-069420 A

Conventional drilling machines, including the one disclosed in Patent Document 1, are generally used in branching work for pipes supported on the ground or underground. However, when drilling the underside of a pipe using the drilling machine disclosed in Patent Document 1, there is a problem in that the moving anti-vibration part falls under its own weight, making it impossible to prevent the spindle from wobbling.

In view of the above problems, the present invention aims to provide a drilling machine that can prevent the spindle from wobbling when drilling the underside of a pipe.

In order to solve such problems, the drilling machine of the present invention is a drilling machine capable of drilling the underside of a pipe, and comprises a body having a top body and an underbody, a spindle to which a cutter is attached, a movable anti-vibration part attached to the outer periphery of the spindle inside the underbody and preventing the spindle from wobbling, and a movable anti-vibration stopper that prevents the moving anti-vibration part from falling under its own weight when drilling the underside of the pipe , the moving anti-vibration stopper is displaceable between a locked position in which the falling movement of the moving anti-vibration part is restricted, and a free position in which the falling movement of the moving anti-vibration part is not restricted, and the drilling machine further comprises an operating part that switches the position of the moving anti-vibration stopper between the locked position and the free position .

In addition, in the drilling machine according to the present invention, the moving anti-vibration stopper can be displaced between a locked position in which the movement of the moving anti-vibration part is restricted and a free position in which the movement of the moving anti-vibration part is not restricted, and the drilling machine further includes an operating unit that switches the position of the moving anti-vibration stopper between the locked position and the free position.

In addition, in the drilling machine according to the present invention, the moving anti-vibration stopper is characterized by having a plunger that abuts against the moving anti-vibration part when in the locked position, and a biasing member that biases the plunger when the operating part is operated.

In addition, in the drilling machine according to the present invention, the moving anti-vibration stopper includes a rod that presses the moving anti-vibration part, a nut attached to the rod, and a male screw into which the nut is tightened, and is characterized in that the moving anti-vibration part is prevented from falling under its own weight by pushing in the rod and tightening the nut onto the male screw.

The present invention provides a drilling machine that can prevent the spindle from wobbling when drilling the underside of a pipe.

FIG. 2 is an external view of the drilling machine according to the first embodiment. FIG. 2 is a partial cross-sectional view of the drilling machine according to the first embodiment. FIG. 2 is an external perspective view of a moving anti-vibration stopper according to the first embodiment. FIG. 4 is a cross-sectional view of a moving anti-vibration stopper in the first embodiment. 4A to 4C are diagrams showing a procedure for preparing a drilling machine in the first embodiment. 4A to 4C are diagrams illustrating a drilling procedure of the drilling machine in the first embodiment. 5A to 5C are diagrams illustrating a procedure for removing the cutter in the first embodiment. FIG. 11 is an external view of a large-scale drilling machine according to a second embodiment. 13A and 13B are diagrams illustrating an set state and a release state of a feed clutch in the second embodiment. 13A and 13B are diagrams showing an open state and a closed state of the vibration prevention stopper in the second embodiment. FIG. 11 is a diagram showing a procedure for preparing for drilling of a large drilling machine in the second embodiment.

First Embodiment
Hereinafter, a first embodiment of the present invention will be specifically described with reference to the drawings.

(External view of the drilling machine 1)
First, an external view of a drilling machine 1 will be described with reference to FIG.

The drilling machine 1 comprises a cylindrical body 2 having a length in the vertical direction, and a spindle 3 to which a cutter 17 (described later) is attached. Here, the body 2 is composed of a top body 2a and a hollow underbody 2b provided below the top body 2a. The spindle 3 also comprises a head 3a, a hexagonal portion 3b, a tip portion 3c, and a tip groove portion 3d.

The drilling machine 1 also has a feed handle 4 that can be rotated in the release direction and the drilling direction, a purge port coupler 5 that checks the airtight performance of the drilling machine 1 by applying pressure, and a knob 7 that can be switched between a locked position in which the movement of the movable anti-vibration stopper 15 described below is restricted, and a free position in which the movement of the movable anti-vibration stopper 15 described below is not restricted.

(Cross-sectional view of the drilling machine 1)
Next, a partial cross-sectional view of the drilling machine 1 will be described with reference to FIG.

As shown in FIG. 2(A), the drilling machine 1 is provided with a power switch 8 for switching the power supply of the drilling machine 1 ON/OFF, and a power plug 9. Inside the underbody 2b, a moving anti-vibration part 10 is provided on the outer periphery of the spindle 3. Here, the outer periphery of the moving anti-vibration part 10 abuts against the inner periphery 2c of the underbody 2b.

As shown in FIG. 2B, the moving anti-vibration part 10 includes a moving anti-vibration ring 11 that prevents the spindle 3 from wobbling during drilling, a ball plunger 12 that is fitted to the inner diameter of the moving anti-vibration ring 11, an O-ring 13 that elastically cushions the impact when the moving anti-vibration part 10 collides with the inner surface 2c of the underbody 2b when the spindle 3 is pulled up, and a dust seal 14 made of an elastic body (e.g., urethane rubber). The drilling machine 1 also includes a moving anti-vibration stopper 15 that prevents the moving anti-vibration part 10 from falling under its own weight. The dust seal 14 includes a storage recess 14a that stores chips generated when drilling the pipe P described later, and a protrusion 14b that abuts against the inner surface 2c of the underbody 2b.

As shown in FIG. 2(B), the moving vibration-proof unit 10 is provided with an air vent 29, which is a passage for discharging gas inside the drilling machine 1 to the outside of the drilling machine 1 and taking in air from the outside of the drilling machine 1 into the inside of the drilling machine 1, and a mesh unit 30 for preventing chips, which will be described later, from entering the inside of the drilling machine 1 through the air vent 29.

(Movement vibration-proof stopper 15)
Next, the moving anti-vibration stopper 15 will be described with reference to Fig. 3 and Fig. 4. Fig. 3 is an external perspective view of the moving anti-vibration stopper 15, and Fig. 4 is a cross-sectional view of the moving anti-vibration stopper 15.

As shown in FIG. 3, the moving anti-vibration stopper 15 is connected to the knob 7 and has a casing 20. The casing 20 has a first display section 21 and a second display section 22. The first display section 21 displays characters indicating the locked position, and the second display section 22 displays characters indicating the free position.

The knob 7 is also engraved with a positioning line 7a, and when the knob 7 is rotated so that the positioning line 7a faces the free direction (the direction of the arrow α), the anti-vibration stopper 15 is in the free position. On the other hand, when the knob 7 is rotated so that the positioning line 7a faces the lock direction (the direction of the arrow β), the anti-vibration stopper 15 is in the lock position.

Here, the moving anti-vibration stopper 15 has a screw hole H drilled therein. The moving anti-vibration stopper 15 is attached to the underbody 2b by inserting a screw (not shown) into this screw hole H and screwing it in.

As shown in FIG. 4, the moving vibration stopper 15 includes a plunger 23 that abuts against the moving vibration stopper 10 when the positioning line 7a of the knob 7 faces the locking direction, a plunger holder 24 that holds the plunger 23, a compression spring 25 that compresses the plunger 23, and an airtight member 26 that blocks the entry of a fluid (e.g., gas). In addition, a parallel pin 27 is attached to the outer periphery of the plunger 23, and the casing 20 is provided with an abutment wall 28 that abuts against the parallel pin 27.

Figure 4 (A) is a cross-sectional view of the moving anti-vibration stopper 15 in the free position. At this time, the compression spring 25 is compressed, and the plunger tip 23a is located outside the inner circumferential surface 2c of the underbody 2b. At this time, the parallel pin 27 is not in contact with the abutment wall 28. As a result, the plunger tip 23a is not in contact with the moving anti-vibration part 10, and the movement of the moving anti-vibration part 10 is permitted.

Figure 4 (B) is a cross-sectional view of the moving anti-vibration stopper 15 in the locked position. Specifically, when the knob 7 is rotated in the state of Figure 4 (A), the positioning line 7a is displaced from the free direction to the locked direction, and the compression spring 25 is displaced from a compressed state to a non-compressed state, and the parallel pin 27 moves until it abuts against the abutment wall 28, and the plunger tip 23a protrudes inward from the inner circumferential surface 2c of the underbody 2b. As a result, the plunger tip 23a abuts against the moving anti-vibration part 10, restricting the movement of the moving anti-vibration part 10, and thus preventing the moving anti-vibration part 10 from falling under its own weight when drilling the underside of the pipe P described below.

(Procedure for preparing the drilling machine 1)
Next, the procedure for preparing the drilling machine 1 for drilling will be described with reference to FIG.

First, as shown in FIG. 5(A), the center drill 18 is attached by inserting it into the cutter 17, and the cutter 17 with the center drill 18 attached is attached to the tip 3c of the spindle 3.

Next, as shown in FIG. 5(B), the position of the knob 7 is checked to confirm that the anti-vibration stopper 15 is in the free position, and then the clutch (not shown) built into the drilling machine 1 is released. Then, the spindle 3 is raised to the top in the direction of arrow A, and the cutter 17 is stored within the inner surface 2c of the underbody 2b.

Next, as shown in Figure 5 (C), insert the spindle stopper 16 and check that the spindle 3 and the movable anti-vibration ring 11 are securely raised to the top position, and then attach the drilling machine 1 to the piping P, which will be described later.

Next, as shown in Figure 5 (D), while maintaining the feed handle 4 in the release direction, the hexagonal portion 3b of the spindle 3 is pushed in the direction of arrow B while being surface-aligned, and at the same time, the tip groove portion 3d of the spindle 3 is engaged with the ball plunger 12, pushing the movable anti-vibration ring 11 to the front of the underbody 2b, and the knob 7 is rotated to set the movable anti-vibration stopper 15 from the free position to the locked position. At this time, it is a good idea to check the airtightness of the drilling machine 1 from the purge port coupler 5.

The reason why the movable anti-vibration ring 11 is pushed to the very front of the underbody 2b is to maintain the movable anti-vibration part 10 in that position during drilling, since it is better for the movable anti-vibration part 10 to be located closer to the target to be drilled in order to prevent the spindle 3 from wobbling.

Next, as shown in FIG. 5(E), rotate the feed handle 4 in the drilling direction and check that the spindle 3 is linked. Then, rotate the feed handle 4 in the drilling direction to lower the center drill 18 to the pipe surface of the piping P, which will be described later.

(Drilling procedure of drilling machine 1)
Next, the drilling procedure of the drilling machine 1 will be described with reference to FIG.

First, as shown in FIG. 6(A), insert the power plug 9 into a power outlet (not shown) and turn the power switch 8 ON.

Next, as shown in FIG. 6(B), the center drill 18 is placed against the underside of the pipe P, and the feed handle 4 is rotated in the drilling direction to drill a hole. At this time, the moving anti-vibration stopper 15 is in the locked position, so the moving anti-vibration part 10 is prevented from falling under its own weight.

Next, as shown in FIG. 6(C), when drilling using the drilling machine 1 is completed, the power switch 8 is operated to turn it OFF, and the power plug 9 is removed to complete the drilling operation.

(Procedure for removing the cutter 17)
Next, a procedure for removing the cutter 17 will be described with reference to FIG.

First, as shown in FIG. 7(A), the knob 7 is rotated to move the movable anti-vibration stopper 15 from the locked position to the free position. This releases the restriction on the movement of the movable anti-vibration part 10 in the direction of the tip 3c. Then, the feed handle 4 is rotated in the release direction to pull up the spindle 3 and fit the closure confirmation cover 19 onto the spindle 3. At this time, it is advisable to perform a purging operation to purge the gas between the purge port coupler 5 and the drilling machine 1.

Next, as shown in FIG. 7(B), the drilling machine 1 is removed from the pipe using a specified jig. Then, the cutter 17, center drill 18, and the section of the pipe P are removed using a specified jig. After this, it is advisable to clean and remove any chips from the drilling machine 1, the movable anti-vibration ring 11, etc.

Second Embodiment
A second embodiment of the present invention will be specifically described with reference to the drawings using Figures 8 to 11. Note that in the second embodiment, the description of the same points as in the first embodiment may be omitted.

(External view of a large-scale drilling machine 40 in a second embodiment)
First, an external view of a large-scale drilling machine 40 according to the second embodiment will be described with reference to FIG.

The large-scale drilling machine 40 is larger than the drilling machine 1 in the first embodiment, but is the same in that it drills pipes P. The large-scale drilling machine 40 also includes a feed clutch 31 that is displaced between a set state and a released state, a rotary clutch knob 32 that is operated when automatically feeding and automatically returning the spindle 3, and a vibration-proof stopper 33 that is displaced between an open state and a closed state. The large-scale drilling machine 40 in the second embodiment differs from the first embodiment in that the hexagonal portion 3b of the spindle 3 in the first embodiment is an octagonal portion 3e, the shape of the tip portion 3c of the spindle 3 is different, and the tip groove portion 3d is a radius portion 3f.

Here, the feed clutch 31 includes a cam cap 31a that is operated when moving the half nut fixing ring 31b, a half nut fixing ring 31b that meshes with the octagonal portion 3e, and a half nut base 31c that is provided below the half nut fixing ring 31b. A half nut (not shown) and a feed clutch spring (not shown) are built into the feed clutch 31. Specifically, the half nut is built into the half nut fixing ring 31b and the half nut base 31c, and the feed clutch spring is built into the half nut base 31c. This half nut is linked to the half nut fixing ring 31b by the feed clutch spring. The vibration stopper 33 includes a rod 33a that presses the vibration stopper 34 described later, a nut 33b attached to the rod 33a, and a male screw 33c into which the nut 33b is tightened.

(Set state and release state of the feed clutch 31)
Next, the set state and the released state of the feed clutch 31 will be described with reference to FIG.

Figure 9 (A) shows the feed clutch 31 in the set state. In the set state, the half nut fixing ring 31b is in contact with the half nut base 31c. If the cam cap 31a is rotated while the half nut fixing ring 31b is pulled, the half nut fixing ring 31b separates from the half nut base 31c, and the set state is released. In the released state, the half nut and the octagonal portion 3e of the spindle 3 are not engaged, so the spindle 3 can be moved up and down.

Figure 9 (B) shows the feed clutch 31 in the released state. In the released state, the half nut fixing ring 31b is not in contact with the half nut base 31c. When the cam cap 31a is rotated, the half nut fixing ring 31b moves toward the half nut base 31c by a spring (not shown), causing the half nut fixing ring 31b to come into contact with the half nut base 31c, changing from the released state to the set state. In the set state, the feed clutch spring biases the half nut inward of the feed clutch 31. This causes the half nut to mesh with the octagonal portion 3e of the spindle 3, making it possible to drill holes by automatically feeding the spindle 3.

(Open state and closed state of the vibration prevention stopper 33 in the second embodiment)
Next, the open state and the closed state of the vibration prevention stopper 33 in the second embodiment will be described with reference to FIG.

As shown in FIG. 10, the drilling machine 1 in the second embodiment is equipped with an anti-vibration part 34 that prevents the spindle 3 from wobbling during drilling operations. The anti-vibration part 34 has a configuration similar to that of the moving anti-vibration part 10 in the first embodiment, and the outer peripheral surface of the anti-vibration part 34 abuts against the inner peripheral surface 2c of the underbody 2b.

Figure 10 (A) shows the anti-vibration stopper 33 in an open state. When the anti-vibration stopper 33 is in an open state, the anti-vibration stopper 33 is not pressing against the rear surface of the anti-vibration part 34, and therefore the movement of the anti-vibration part 34 is not restricted. Therefore, the open state corresponds to the free position in the first embodiment.

When the spindle 3 is pushed in while the anti-vibration stopper 33 is in the open state, the anti-vibration part 34 is pushed to the front with the radiused part 3f of the spindle 3 engaged with the ball plunger 12. Then, the rod 33a is pushed in and the nut 33b is tightened onto the male screw 33c. This eliminates the movement space of the anti-vibration part 34, and the anti-vibration stopper 33 goes from the open state to the closed state. If the spindle 3 is pushed in further, the ball plunger 12 goes in further, and the large cutter 41 stored in the inner peripheral surface 2c of the underbody 2b comes out of the inner peripheral surface 2c of the underbody 2b.

Figure 10 (B) shows the anti-vibration stopper 33 in the closed state. When the anti-vibration stopper 33 is in the closed state, the anti-vibration stopper 33 presses against the rear surface of the anti-vibration part 34, restricting the movement of the anti-vibration part 34. Therefore, the closed state corresponds to the locked position in the first embodiment.

In addition, in the closed state, the rear surface of the vibration-proof part 34 is pressed against the vibration-proof stopper 33, so that the vibration-proof part 34 will not fall due to its own weight when drilling the underside of the pipe P.

(Procedure for preparing drilling for the large drilling machine 40 in the second embodiment)
Next, the procedure for preparing for drilling of the large drilling machine 40 in the second embodiment will be described with reference to FIG.

First, as shown in FIG. 11(A), the large drill 42 used in the large drilling machine 40 is inserted into the large cutter 41 used in the large drilling machine 40, and the large cutter 41 with the large drill 42 attached is attached to the tip 3c of the spindle 3.

Next, as shown in FIG. 11(B), the spindle 3 is raised to the top in the direction of arrow A, the spindle stopper 16 is inserted, and it is confirmed that the spindle 3 is raised to the top. At this time, the large cutter 41 is stored within the inner circumferential surface 2c of the underbody 2b. Then, after confirming that the anti-vibration stopper 33 is in the open state and the feed clutch 31 is in the released state, the drilling machine 1 is attached to the pipe P.

Next, as shown in Figure 11 (C), remove the spindle stopper 16 and rotate the rotary clutch knob 32.

Next, as shown in FIG. 11(D), the spindle 3 is pushed in the direction of the arrow B, and at the same time, the vibration-prevention stopper 33 is changed from the open state to the closed state. This causes the vibration-prevention part 34 to be pushed out to the front of the underbody 2b.

Next, as shown in FIG. 11(E), push the spindle 3 further in the direction of arrow B to set the feed clutch 31.

Other Embodiments
Other embodiments will be described below.

In the first embodiment described above, the moving vibration stopper 15 restricts the movement of the moving vibration stopper 10 in the direction of the tip 3c by the plunger tip 23a abutting against the moving vibration stopper 10, but this is not limited to the above. For example, a recess may be provided on the outer periphery of the moving vibration stopper 10, and the plunger tip 23a may be inserted into this recess to restrict the movement of the moving vibration stopper 10 in the direction of the tip 3c.

In the first embodiment described above, the plunger 23 is configured so that the plunger tip 23a protrudes toward the inner circumferential surface 2c of the underbody 2b by rotating the knob 7, but this is not limited to this. For example, the plunger tip 23a may protrude toward the inner circumferential surface 2c of the underbody 2b by pressing a button.

In addition, in the above-mentioned first embodiment, the movable anti-vibration stopper 15 is described as being single, but this is not limited to this. For example, multiple movable anti-vibration stoppers 15 may be provided. Similarly, multiple anti-vibration stoppers 33 in the second embodiment may be provided. By providing multiple movable anti-vibration stoppers 15 and anti-vibration stoppers 33, it is possible to further prevent core wobble of the spindle 3.

In this way, when the knob 7 of the drilling machine 1 of the present invention is rotated, the compression spring 25 causes the plunger tip 23a to protrude inward from the inner circumferential surface 2c of the underbody 2b, and the plunger tip 23a comes into contact with the moving vibration prevention part 10. This restricts the movement of the moving vibration prevention part 10, preventing the moving vibration prevention part 10 from falling under its own weight when drilling the underside of the pipe P, thereby providing a drilling machine 1 that can prevent core wobble of the spindle 3.

(First Invention)
The first invention is a drilling machine capable of drilling the underside of a pipe (e.g., pipe P), characterized in that it comprises a spindle (e.g., spindle 3) to which a cutter (e.g., cutter 17) is attached, a moving anti-vibration section (e.g., moving anti-vibration section 10, anti-vibration section 34) that prevents the spindle from wobbling, and a moving anti-vibration stopper (e.g., moving anti-vibration stopper 15, anti-vibration stopper 33) that prevents the moving anti-vibration section from falling under its own weight when drilling the underside of the pipe.

(Second Invention)
The second invention is the drilling machine described in the first invention, characterized in that the moving anti-vibration stopper is displaceable between a locked position in which the moving anti-vibration portion is locked and a free position in which the moving anti-vibration portion is not locked, and further comprising an operating portion (e.g., knob 7, nut 33b) for switching the position of the moving anti-vibration stopper between the locked position and the free position.

(Third Invention)
The third invention is the drilling machine described in the second invention, characterized in that the moving anti-vibration stopper comprises a plunger (e.g., plunger 23) that abuts against the moving anti-vibration portion when in the locked position, and a biasing member (e.g., compression spring 25) that biases the plunger when the operating portion is operated.

(Fourth Invention)
A fourth invention is the drilling machine described in the second invention, characterized in that the moving anti-vibration stopper comprises a rod (e.g., rod 33a) that presses the moving anti-vibration portion, a nut (e.g., nut 33b) attached to the rod, and a male screw (e.g., male screw 33c) into which the nut is tightened, and by pushing in the rod and tightening the nut onto the male screw, the moving anti-vibration portion is prevented from falling under its own weight.

The above embodiments and variations are merely examples and may be modified as appropriate without departing from the scope of the present invention.

REFERENCE SIGNS LIST 1 Drilling machine 2 Body 2a Top body 2b Underbody 2c Inner circumferential surface 3 Spindle 3a Head 3b Hexagonal portion 3c Tip portion 3d Tip groove portion 3e Octagonal portion 3f R portion 4 Feed handle 5 Purge port coupler 7 Knob 7a Positioning line 8 Power switch 9 Power plug 10 Moving anti-vibration portion 11 Moving anti-vibration ring 12 Ball plunger 13 O-ring 14 Dust seal 14a Storage recess 14b Convex portion 15 Moving anti-vibration stopper 16 Spindle stopper 17 Cutter 18 Center drill 19 Closing confirmation cover 20 Casing 21 First display portion 22 Second display portion 23 Plunger 23a Plunger tip 24 Plunger holder 25 Compression spring 26 Airtight member 27 Parallel pin 28 Abutment wall 29 Vent 30 Mesh portion 31 Feed clutch 31a Cam cap 31b Half nut fixing ring 31c Half nut base 32 Rotation clutch knob 33 Anti-vibration stopper 33a Rod 33b Nut 33c Male screw 34 Anti-vibration portion 40 Large drill 41 Large cutter 42 Large drill H Screw hole P Piping

Claims (3)

A drilling machine capable of drilling a bottom surface of a pipe,
a body having a top body and an underbody;
a spindle to which the cutter is attached;
A movable vibration prevention part that is attached to an outer periphery of the spindle inside the underbody and prevents the spindle from vibrating.
a moving vibration-proof stopper that prevents the moving vibration-proof part from falling under its own weight when drilling a hole in the lower surface of the pipe;
Equipped with
The moving vibration stopper is
The movable anti-vibration unit is displaceable between a locked position where the falling movement of the movable anti-vibration unit is restricted and a free position where the falling movement of the movable anti-vibration unit is not restricted,
The drilling machine further comprises an operating unit that switches the position of the movable anti-vibration stopper between the locked position and the free position . The moving vibration stopper is
a plunger that comes into contact with the moving anti-vibration portion when the plunger is in the locked position;
a biasing member that biases the plunger when the operating portion is operated;
2. The drilling machine according to claim 1 , further comprising: The moving vibration stopper is
A rod that presses the moving anti-vibration part;
A nut attached to the rod;
A male screw into which the nut is fastened;
It is equipped with
2. The drilling machine according to claim 1 , wherein the movable anti-vibration part is prevented from falling under its own weight by pushing in the rod and tightening the nut onto the male screw.