Perforator

Abstract

To provide a piercing machine which can prevent chips from entering the piercing machine when a lower surface of a pipe is pierced.SOLUTION: When a lower surface of a pipe P is pierced by using a piercing machine 1 of the invention, a blade of a cutter 17 digs into the pipe P to generate chips C. The generated chips C fall due to its self-weight and are accumulated in a housing recessed part 14a of a dust seal 14 provided at a movement stop part 10. The structure can prevent the chips C from entering the piercing machine 1.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a drilling machine for drilling pipes.

Background Art

[0002] Conventionally, chips are generated when drilling pipes. These chips may have an adverse effect when drilling pipes. In contrast, a drilling machine capable of efficiently drilling even when chips are generated is known (for example, Patent Document 1).

[0003] Such a drilling machine forms a deep hole that opens to the cutting edge side inside the drill bit, forms a groove communicating with this deep hole, and has a spiral groove engraved on the opening side of the deep hole. As a result, since the chips are stored in the deep hole, no adverse effects caused by the chips occur, and thus the pipe can be drilled efficiently.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventional drilling machines including the drilling machine disclosed in Patent Document 1 are generally used for branch work of pipes supported on the ground or underground. Here, when drilling the upper surface of a pipe using the drilling machine disclosed in Patent Document 1, the chips are stored in the deep hole. On the other hand, when drilling the lower surface of the pipe, there is a risk that the chips will fall due to their own weight and enter the drilling machine. If the chips enter the drilling machine, it may lead to damage to the drilling machine. In addition, there is a problem that it is difficult to remove the chips if fine powdery chips enter the drilling machine.

[0006] In view of such problems, an object of the present invention is to provide a drilling machine capable of preventing chips from entering the drilling machine when drilling the lower surface of a pipe.

Means for Solving the Problems

[0007] In order to solve such problems, the drilling machine according to the present invention drills the lower surface of a pipe Do and is a drilling machine, A body having a top body and an underbody, a cutter for drilling the pipe, A spindle to which the cutter is attached, a movement stopper that is inside the underbody, attached to the outer periphery of the spindle, and prevents the core breakage of the spindle, and a movement stopper that prevents the movement stopper from falling by its own weight when piercing the lower surface of the pipe, a dust seal for storing chips generated when the cutter drills the lower surface of the pipe, The movement stopper is displaceable between a lock position where the downward movement of the movement stopper is restricted and a free position where the downward movement of the movement stopper is not restricted, and further includes an operation unit for switching the position of the movement stopper between the lock position and the free position. The dust seal is provided on the movement stopper which is characterized in that.

[0008] Further, the drilling machine according to the present invention includes a spindle to which the cutter is attached, and a movement restraint portion for preventing the core of the spindle from vibrating, and the dust seal is provided in the movement restraint portion.

[0009] Further, in the drilling machine according to the present invention, the dust seal is characterized by including a storage recess for storing the chips.

Effects of the Invention

[0010] According to the present invention, it is possible to provide a drilling machine capable of preventing chips from entering the drilling machine when drilling the lower surface of a pipe.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Best Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

[0013] (External view of the drilling machine 1) First, with reference to FIG. 1, an external view of the drilling machine 1 will be described.

[0014] The drilling machine 1 includes 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 an underbody 2b provided below the top body 2a and housing a movement restraint portion 10 described later. The spindle 3 includes a head 3a, a hexagonal portion 3b, a tip portion 3c, and a tip groove portion 3d.

[0015] The drilling machine 1 also includes a feed handle 4 that can be rotated in the release direction and the drilling direction, a purge port coupler 5 for checking the airtight performance of the drilling machine 1 by applying pressure, and a knob 7 for switching the position of a vibration restraint ring stopper 15 described later between a locked position and a free position.

[0016] (Cross-sectional view of the drilling machine 1) Next, with reference to FIG. 2, a partial cross-sectional view of the drilling machine 1 will be described. Note that FIG. 2(A) is a partial cross-sectional view of the movement restraint portion 10, and FIG. 2(B) is an enlarged cross-sectional view of the movement restraint portion 10.

[0017] As shown in FIG. 2(A), the drilling machine 1 is provided with a power switch 8 for switching the ON / OFF of the power supply of the drilling machine 1 and a power plug 9, and a movement restraint portion 10 is provided inside the underbody 2b. Here, the movement restraint portion 10 includes a movement restraint ring 11 for preventing the core runout of the spindle 3 during the drilling operation, a ball plunger 12 incorporated in the inner diameter of the movement restraint ring 11, an O-ring 13 for elastically relaxing the impact when the movement restraint portion 10 and the inner peripheral surface 2c of the underbody 2b collide when the spindle 3 is pulled up, a dust seal 14 made of an elastic body (for example, urethane rubber), and a vibration restraint ring stopper 15 for preventing the movement restraint ring 11 from falling by its own weight.

[0018] Here, as shown in FIG. 2(B), the dust seal 14 includes a storage recess 14a for storing the chips C generated when the pipe P described later is drilled and a convex portion 14b that abuts against the inner peripheral surface 2c of the underbody 2b.

[0019] Also, as shown in FIG. 2(B), the movement restraint portion 10 includes a vent hole 20 that is a passage for discharging the gas inside the drilling machine 1 to the outside of the drilling machine 1 and taking in the air outside the drilling machine 1 into the inside of the drilling machine 1, and a mesh portion 21 for preventing the chips C described later from entering the inside of the drilling machine 1 from the vent hole 20.

[0020] (Procedure for preparing the drilling machine 1 for drilling) Next, with reference to FIG. 3, the procedure for preparing the drilling machine 1 for drilling will be described.

[0021] First, as shown in FIG. 3(A), the center drill 18 is inserted into the cutter 17 for attachment, and the cutter 17 with the center drill 18 attached is attached to the tip portion 3c of the spindle 3.

[0022] Next, as shown in FIG. 3(B), after confirming that the vibration stop ring stopper 15 is in the free position by checking the position of the knob 7, the clutch (not shown) installed in the punching machine 1 is released. Then, the spindle 3 is pulled up to the uppermost position in the direction of arrow A, and the cutter 17 is housed within the inner peripheral surface 2c of the underbody 2b.

[0023] Next, as shown in FIG. 3(C), the spindle stopper 16 is inserted, and after confirming that the spindle 3 and the moving vibration stop ring 11 have been securely pulled up to the uppermost position, the punching machine 1 is attached to the pipe P described later.

[0024] Next, as shown in FIG. 3(D), while maintaining the feed handle 4 in the release direction, the hexagonal portion 3b of the spindle 3 is aligned and pushed in the direction of arrow B, and at the same time, the tip groove portion 3d of the spindle 3 and the ball plunger 12 are fitted together, thereby pushing the moving vibration stop ring 11 to the outermost front surface of the underbody 2b, and the vibration stop ring stopper 15 is set from the free position to the locked position by rotating the knob 7. At this time, it is advisable to check the airtightness of the punching machine 1 from the purge port coupler 5.

[0025] Next, as shown in FIG. 3(E) 、 The feed handle 4 is rotated in the punching direction, and it is confirmed that the spindle 3 interlocks. Then, the feed handle 4 is rotated in the punching direction to lower the center drill 18 to the pipe surface of the pipe P described later.

[0026] (Punching procedure of the punching machine 1) Next, with reference to FIG. 4, the punching procedure of the punching machine 1 will be described.

[0027] First, as shown in FIG. 4(A), with the power plug 9 inserted into an outlet (not shown), the power switch 8 is operated to turn it ON.

[0028] Next, as shown in FIG. 4(B), place the center drill 18 against the lower surface of the pipe P, and rotate the feed handle 4 in the drilling direction to perform drilling. At this time, it is advisable to perform a purge operation to check the pressure inside the pipe P from the purge port coupler 5.

[0029] Next, as shown in FIG. 4(C), when the drilling using the drilling machine 1 is completed, operate the power switch 8 to turn it off, remove the power plug 9, and the drilling operation is completed.

[0030] (Method for removing the chips C accumulated in the dust seal 14) Next, with reference to FIG. 5, a method for removing the chips C accumulated in the dust seal 14 will be described.

[0031] FIG. 5(A) is an enlarged cross-sectional view of the movement stopper 10 after drilling the lower surface of the pipe P using the drilling machine 1 in the present embodiment. When drilling the lower surface of the pipe P using the drilling machine 1 in the present embodiment, the chips C fall due to their own weight, but since the chips C accumulate in the storage recess 14a of the dust seal 14, it is possible to prevent the chips C from entering the inside of the drilling machine 1. Further, since the convex portion 14b of the dust seal 14 is in contact with the inner peripheral surface 2c of the underbody 2b, it is possible to prevent the chips C from entering the inside of the drilling machine 1. By these means, it is possible to prevent in advance the damage that may occur due to the chips C entering the drilling machine 1.

[0032] Then, as shown in FIG. 5(B), use the magnet M to remove and clean the chips C accumulated in the storage recess 14a of the dust seal 14.

[0033] Note that when drilling the pipe P using the drilling machine 1, it is conceivable that chips C exceeding the capacity that can be stored in the storage recess 14a of the dust seal 14 are generated. However, the chips C exceeding the capacity that can be stored in the storage recess 14a of the dust seal 14 will accumulate near the dust seal 14. Therefore, by using the magnet M, it is possible to clean up the chips C stored in the storage recess 14a of the dust seal 14 and the chips C exceeding the capacity that can be stored in the storage recess 14a of the dust seal 14 together.

[0034] (Other Embodiments) In the following, other embodiments will be described.

[0035] In the above-described embodiment, the shape of the groove of the storage recess 14a of the dust seal 14 is U-shaped, but it is not limited thereto. For example, the shape of the groove of the storage recess 14a of the dust seal 14 may be V-shaped or other shapes.

[0036] In the above-described embodiment, the chips C accumulated in the storage recess 14a of the dust seal 14 are removed and cleaned using the magnet M, but it is not limited thereto. For example, it may be removed and cleaned using a waste cloth, or may be removed and cleaned using other things.

[0037] In particular, when the pipe P to be drilled is made of metal, since the chips C are also metal, it is preferable to remove and clean the chips C using the magnet M as described above. On the other hand, when the pipe P to be drilled is made of resin, it is preferable to remove and clean the chips C using a waste cloth or the like.

[0038] Thus, when the lower surface of the pipe P is drilled using the drilling machine 1 in the present invention, the blade of the cutter 17 bites in and chips C are generated. Then, the generated chips C fall by their own weight and accumulate in the storage recess 14a of the dust seal 14 provided in the movement stopper 10. Thereby, it is possible to prevent the chips C from entering the drilling machine 1.

[0039] (First Invention) The first invention is a drilling machine capable of drilling the lower surface of a pipe (for example, pipe P), comprising a cutter (for example, cutter 17) for drilling the pipe, and a dust seal (for example, dust seal 14) for storing chips (for example, chips C) generated when the cutter drills the lower surface of the pipe.

[0040] (Second Invention) The second invention includes a spindle (for example, spindle 3) to which the cutter is attached, and a movement damping portion (for example, movement damping portion 10) that prevents the core of the spindle from vibrating, and the dust seal is provided on the movement damping portion, and is a drilling machine according to the first invention.

[0041] (Third Invention) In the third invention, the dust seal includes a storage recess (for example, storage recess 14a) for storing the chips, and is a drilling machine according to the first invention or the second invention.

[0042] Note that the matters shown in the above embodiments and modifications are merely examples, and can be appropriately changed without departing from the scope of the present invention.

Explanation of Reference Numerals

[0043] 1 Drilling machine 2 Body 2a Top body 2b Under body 2c Inner peripheral surface 3 Spindle 3a Head 3b Hexagonal portion 3c Tip portion 3d Tip groove portion 4 Feed handle 5 Purge port coupler 7 Knob 8 Power switch 9 Power plug 10 Movement damping portion 11 Movement damping ring 12 Ball plunger 13 O-ring 14 Dust seal 14a Storage recess 14b Protrusion 15 Damping ring stopper 16 Spindle stopper 17 Cutter 18 Center drill 20 Vent hole 21 Mesh part C Cutting powder M Magnet P Pipe

Claims

1. A drilling machine for drilling the lower surface of a pipe, comprising: a body having a top body and an under body; a cutter for drilling the pipe; a spindle to which the cutter is attached; a moving vibration damper disposed inside the under body, attached to the outer periphery of the spindle, and preventing core breakage of the spindle; a moving vibration damper stopper for preventing the moving vibration damper from falling and moving under its own weight when drilling the lower surface of the pipe; a dust seal for storing chips generated when the cutter drills the lower surface of the pipe; The drilling machine is characterized in that: The moving vibration damper stopper: is displaceable between a lock position where the falling movement of the moving vibration damper is restricted and a free position where the falling movement of the moving vibration damper is not restricted; further comprises an operating part for switching the position of the moving vibration damper stopper between the lock position and the free position; The dust seal: is provided on the moving vibration damper.

2. The dust seal: The drilling machine according to claim 1, further comprising a storage recess for storing the chips.

Images