Drilling machine

Abstract

To provide a drilling machine which can easily control a cutter advance speed by manual handle rotation operation.SOLUTION: A drilling machine 5 for drilling a part of a fluid pipe 1 in a non-interrupted flow state comprises: a shaft member 54 to a tip of which a cutter 52 is attached; driving means 55 which enables rotational motion of the cutter 52 and the shaft member 54 around an axis of the shaft member 54; advance / retreat operation means 56 which enables advance / retreat motion of the cutter 52 and the shaft member 54 in an axial direction of the shaft member 54 by manual rotation operation of a handle 56a; and an advance / retreat case 57 which accommodates at least a part of the driving means 55. The advance / retreat operation means 56 can change a feed amount of the cutter 52 and the shaft member 54 in the axial direction according to a rotation amount of the handle 56a between at least two stages, and an open hole 57c, through which the shaft member 54 is inserted, is formed in the advance / retreat case 57.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a drilling machine for forming a through hole in a fluid pipe. [Background technology]

[0002] In the case of an existing fluid pipe that constitutes a pipeline through which water, gas, etc. flows, a drilling machine may be used to drill a portion of the fluid pipe while the flow is uninterrupted in order to form a new branch passage.

[0003] This method of drilling a fluid pipe primarily uses a branch housing, an operation valve, and a drilling machine. Specifically, first, the covering portion of the branch housing is hermetically attached to the wall of the existing fluid pipe. Next, a operation valve is hermetically attached to the branch portion of the branch housing, which extends from the covering portion of the branch housing in a direction different from the axial direction of the fluid pipe. Next, a drilling machine is connected to the operation valve via a mounting flange. Next, the cutter of the drilling machine is advanced and moved toward the fluid pipe within the branch portion, and while rotating it with a drive unit, a portion of the fluid pipe is cut with the cutter to form a through hole. Additionally, by appropriately opening and closing the operation valve during drilling with the drilling machine, a portion of the fluid pipe can be removed without interrupting the flow.

[0004] For example, as shown in Patent Document 1, a drilling machine includes a connection flange, a shaft member, and a cutter. The connection flange is fixed in a sealed manner to a mounting flange attached to a branching portion of a branching housing. The shaft member is movable forward and backward relative to the connection flange. The cutter is fixed to the tip of the shaft member and is movable forward and backward together with the shaft member relative to the connection flange.

[0005] The cutter and shaft member are advanced and retracted by manually rotating a handle attached to an advance / retract mechanism provided at the opposite end of the shaft member. Specifically, manually rotating the handle attached to the advance / retract mechanism rotates a screw shaft (not shown) inserted inside the shaft member. A female thread corresponding to the screw shaft is threaded on the inner periphery of the shaft member. Rotation of the screw shaft moves the cutter and shaft member relative to the axial direction of the screw shaft without rotating the cutter and shaft member. The cutter and shaft member can be rotated by a drive unit (not shown) independently of the rotation of the handle. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2015-42894 A (page 5, Figure 3) Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, when forming a through hole in a fluid pipe using a drilling machine such as that described in Patent Document 1, the cutter and shaft member are rotated by a drive unit, and the handle attached to the operating unit is manually rotated to move the cutter forward and backward, bringing the cutter into contact with the peripheral wall of the fluid pipe and cutting a portion of the peripheral wall. In other words, the axial movement of the cutter and shaft member depends on the rotation of the handle. Furthermore, a drilling machine such as that described in Patent Document 1 is equipped with a work valve for cutting the fluid pipe under uninterrupted flow conditions, and the cutter, which is attached outward of the work valve, is positioned far away from the existing fluid pipe. Therefore, in order to move the cutter forward and backward within the branch section in a short time, the cutter feed amount is set to be large for a given amount of rotation of the handle.

[0008] On the other hand, in a drilling machine such as that described in Patent Document 1, the contact state between the cutter and the peripheral wall of the fluid pipe in the branch section is intuitively grasped by the change in resistance force transmitted to the operator's hand via the handle. Furthermore, the contact state between the cutter and the peripheral wall of the fluid pipe changes depending on the degree of advancement of the cutter. For example, when the cutter begins to contact the peripheral wall at the top of the fluid pipe, the contact area (resistance force transmitted to the operator's hand) is small. Subsequently, as the cutter advances, the contact area (resistance force transmitted to the operator's hand) increases, and as the cutter penetrates the entire peripheral wall of the fluid pipe, the contact area (resistance force transmitted to the operator's hand) decreases. Therefore, in a drilling machine such as that described in Patent Document 1, it is difficult to appropriately control the advancement speed of the cutter by manually fine-tuning the rotation of the handle. Therefore, if the advancement speed of the cutter is too fast while the cutter is in contact with the peripheral wall of the fluid pipe, the friction force generated between the cutter and the fluid pipe becomes excessively large, resulting in wear and damage to the cutter.

[0009] The present invention has been made in view of these problems, and has as its object to provide a drilling machine in which the cutter advancement speed can be easily controlled by manually rotating the handle. [Means for solving the problem]

[0010] In order to solve the above problems, the drilling machine of the present invention comprises: A drilling machine for drilling a portion of a fluid pipe in an uninterrupted flow state, comprising: a shaft member having a cutter attached to a tip thereof; a driving means for rotating the cutter and the shaft member around the axis of the shaft member; and an advancing / retracting operation means for advancing / retracting the cutter and the shaft member in the axial direction of the shaft member by manually rotating a handle, The advance / retract operation means is characterized in that it is possible to switch the axial feed amount of the cutter and the shaft member in at least two stages in accordance with the rotation amount of the handle. According to this feature, by increasing the axial feed rate of the cutter and shaft member in response to the amount of rotation of the handle, the advancement speed of the cutter and shaft member until they approach the existing fluid pipe can be increased. Furthermore, by decreasing the axial feed rate of the cutter and shaft member in response to the amount of rotation of the handle, the advancement speed of the cutter and shaft member when cutting the peripheral wall of the fluid pipe can be decreased. Therefore, the advancement speed of the cutter can be easily controlled by manually rotating the handle.

[0011] The cutter is characterized by having a center drill that protrudes in the advancing direction. According to this feature, when it is determined that the center drill has come into contact with the existing fluid pipe, the feed rate of the cutter and the shaft member in the axial direction can be switched to be reduced.

[0012] The center drill is characterized by having a recovery means for recovering the cut pieces of the fluid pipe. According to this feature, after cutting an existing fluid pipe, the axial feed amount of the cutter and shaft member can be increased by rotating the handle, so that the cut pieces of the fluid pipe can be recovered in a short time by the recovery means.

[0013] The advancing / retreating operation means is characterized by including at least a first input shaft and a second input shaft that have different axial feed amounts per one rotation of the handle. According to this feature, the axial feed amount of the cutter and the shaft member can be changed by rotating the handles connected to the input shafts.

[0014] The handle is characterized in that it is attachable to and detachable from the first input shaft and the second input shaft. According to this feature, one handle can be detached and connected to multiple input shafts, allowing the drilling machine to be configured compactly, and by removing the handle from an unused input shaft, interference caused by the rotational movement of the unused input shaft can be avoided when manually rotating the handle.

[0015] The first input shaft and the second input shaft are each provided with a cover member that surrounds the outer periphery of the shaft in the circumferential direction. According to this feature, since each input shaft is surrounded by a cover member, it is possible to prevent accidents caused by contact with or getting caught in an unused input shaft to which a handle is not attached when rotating the handle. [Brief explanation of the drawings]

[0016] [Figure 1] 10 is a side cross-sectional view showing a branch housing and an operation valve attached to a fluid pipe in the embodiment. FIG. [Figure 2] FIG. 10 is a side cross-sectional view showing the state in which the hydraulic lid is attached to the branch housing. [Figure 3] FIG. 10 is a side cross-sectional view showing a state in which a drilling machine is attached to an opening of a branch housing. [Figure 4] FIG. 2 is a side cross-sectional view showing the structure of a drilling machine. [Figure 5] FIG. 2 is a front cross-sectional view showing the structure of the drilling machine. [Figure 6] 10 is a side cross-sectional view showing a state in which a center drill comes into contact with a peripheral wall of a fluid pipe during a process of drilling the fluid pipe using a drilling machine. FIG. [Figure 7] 10 is a side cross-sectional view showing a state in which a cutting blade of a cutter cuts a peripheral wall of a fluid pipe during a process of drilling a fluid pipe using a drilling machine. FIG. [Figure 8] 10 is a cross-sectional side view showing how cut pieces of the fluid pipe are collected during the process of drilling the fluid pipe using a drilling machine. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drilling machine according to an embodiment of the present invention will be [Example]

[0018] In the embodiment, a series of steps up to cutting a predetermined portion of an existing fluid pipe 1 constituting a flow path component by a drilling machine 5 in a state where the flow is not interrupted will be described with reference to FIGS.

[0019] As shown in Figure 1, excavation is performed around a predetermined location of a fluid pipe 1 buried underground, and a branch housing 2 having a two-part structure with a branch portion 2a opening upward is sealed around the excavation. The fluid in the fluid pipe 1 may be, for example, tap water, industrial water, sewage, or a gas or a gas-liquid mixture of gas and liquid. Furthermore, although the branch housing 2 has a two-part structure in this embodiment, it may also have a multi-part structure. The split housings may be joined together by welding or by bolts via packing.

[0020] The fluid pipe 1 is a ductile cast iron pipe formed into a straight pipe with a generally circular cross section. The fluid pipe according to the present invention may also be made of other metals such as cast iron or steel, or concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner circumferential surface of the fluid pipe may be coated with an epoxy resin layer, mortar, plating, or the like, or may be coated with an appropriate material by powder coating.

[0021] Furthermore, when attaching the branch housing 2 to the fluid pipe 1, a concrete foundation (not shown) is formed below the branch housing 2 to support the weight around the branch housing 2 and prevent bending of the fluid pipe 1. Note that the foundation is not limited to a concrete foundation, and a jack or the like may be used as long as it can support the weight of the branch housing 2 and the drilling machine 5 (described later).

[0022] Furthermore, a packing (not shown) is pressed in the circumferential direction between the pipe wall of the fluid pipe 1 and the branch housing 2, thereby ensuring a tight seal between the fluid pipe 1 and the branch housing 2. The packing may be press-fitted into a recessed groove provided on the branch housing 2 side, or may be press-fitted into a recessed groove provided on the fluid pipe 1 side.

[0023] In addition, the branching housing 2 has an open end 2b that opens upward at the upper end of the branching portion 2a.

[0024] Next, as shown in Fig. 1, the working valve 4 is fixed with bolts and nuts to the branch section 2a of the branch housing 2. The working valve 4 is capable of closing the inside of the branch section 2a. The branch housing 2 with the working valve 4 connected thereto may be attached to the fluid pipe 1 in advance, or the branch housing 2 may be integrally provided with a working valve capable of closing the inside of the branch section 2a.

[0025] The working valve 4 is mainly composed of a valve cover 41 , a valve body 42 , and a valve stem 43 .

[0026] The valve cover 41 is sealed to an opening 2c formed on the side of the branch portion 2a. The valve element 42 is housed in the valve cover 41 and can be seated on a valve seat 2d formed on the inner periphery of the branch portion 2a. The valve stem 43 connects the valve element 42 to the valve cover 41 so that the valve element 42 can move back and forth.

[0027] More specifically, by rotating the working valve handle 44 and rotating the valve stem 43 forward, the working valve 4 can advance the valve element 42 toward the branch section 2a and seat it on the valve seat 2d, thereby closing the inside of the branch housing 2. Furthermore, by rotating the working valve handle 44 and rotating the valve stem 43 in the reverse direction, the working valve 4 can retract the valve element 42 toward the valve cover 41, thereby opening the inside of the branch housing 2.

[0028] Next, as shown in Figure 2, a drain pipe is connected to a drain port (not shown) of the branch housing 2, and the branch housing 2 and the work valve 4 are filled with water. In addition, a water pressure lid 63 is fixed with bolts and nuts above the open end 2b of the branch section 2a of the branch housing 2. In this state, water is further poured into the branch housing 2 and the work valve 4 to increase the pressure to a predetermined level, and the presence or absence of water leakage is confirmed. After confirmation is complete, the water pressure lid 63 is removed, and the water inside the branch housing 2 and the work valve 4 is drained through the drain pipe. A drain hose and a chip collection machine may be connected to the drain pipe.

[0029] Next, as shown in Fig. 3, a drilling machine 5 is fixed with bolts and nuts above the open end 2b of the branch section 2a of the branching housing 2 via a mounting flange tube 7. The drilling machine 5 is capable of cutting a portion of the peripheral wall of the fluid pipe 1 inside the branching housing 2 with a cutter 52 for drilling without interrupting flow.

[0030] As shown in FIG. 4, the drilling machine 5 is mainly composed of a cutter 52, a connection flange 53, a shaft member 54, a drive mechanism 55 as a driving means, and an advance / retract mechanism 56 as an advance / retract operation means.

[0031] As shown in FIGS. 4 and 5, the cutter 52 is mainly composed of a cylindrical member 52a and a center drill 52b.

[0032] The cylindrical member 52a, also known as a hole saw, is provided with a cutting blade 52e extending circumferentially at its lower end, and the interior of the cylindrical member 52a is open downward. The center drill 52b is disposed coaxially with the cylindrical member 52a and protrudes downward beyond the cutting blade 52e, i.e., in the direction in which the cutter 52 advances. The cylindrical member 52a and the center drill 52b are fixed together.

[0033] Furthermore, holders 52c are provided at two locations, one above the other, in the middle of the center drill 52b as recovery means. The holders 52c are expandable in the outer diameter direction of the center drill 52b and are capable of locking and holding the cut piece 1a of the fluid pipe 1 (see FIG. 8).

[0034] Above the cutter 52, a shaft member 54 is attached so as to be unable to rotate relative to the cutter.

[0035] As shown in FIGS. 4 and 5, the connection flange 53 is placed above the cylindrical portion 7a (see FIG. 3) that protrudes upward at the center of the mounting flange tube 7, and is fixed with bolts and nuts.

[0036] Furthermore, a packing (not shown) is pressed circumferentially between the cylindrical portion 7a of the mounting flange tube 7 and the connection flange 53, ensuring a tight seal between the mounting flange tube 7 and the connection flange 53. The packing may be press-fitted into a groove provided on the connection flange 53 side, or may be press-fitted into a groove provided on the mounting flange tube 7 side.

[0037] Furthermore, a through-hole 53a is formed in the center of the connection flange 53, penetrating in the up-down direction, and a shaft member 54 is inserted into the through-hole 53a. A bearing 53b is provided on the inner periphery of the through-hole 53a, and the shaft member 54 inserted into the through-hole 53a can smoothly move forward and backward and rotate while maintaining a sealed state relative to the connection flange 53.

[0038] 4 and 5, the shaft member 54 is mainly composed of a cylindrical portion 54a and an adapter 54b. The cylindrical portion 54a and the adapter 54b are fixed together.

[0039] An upwardly recessed recess 54c is formed at the bottom end of the adapter 54b. A protrusion 52d protruding upward from the center of the cutter 52 is inserted into the recess 54c.

[0040] 4, the drive mechanism 55 is mainly composed of a rotary motor 55a, a first gear 55b, and a second gear 55c. The first gear 55b and the second gear 55c are spur gears.

[0041] The rotary motor 55a is a hydraulic motor and is equipped with an inlet port 55d and an outlet port (not shown) for hydraulic oil. The rotary motor 55a transmits rotational force to the shaft member 54 by hydraulic oil supplied to the rotary motor 55a at a predetermined pressure and a predetermined flow rate from a hydraulic unit (not shown). More specifically, the rotary motor 55a has a first gear 55b attached to the tip of the drive shaft. The first gear 55b is externally circumscribed by a second gear 55c. The second gear 55c is fixed to the end of the cylindrical portion 54a of the shaft member 54.

[0042] In this way, the drive mechanism 55 can rotate the shaft member 54 via the second gear 55c by applying a rotational force to the first gear 55b using the rotary motor 55a. Furthermore, the rotation of the shaft member 54 can rotate the cutter 52 together. In this embodiment, the drive mechanism 55 transmits rotation to the shaft member 54 via the first gear 55b and the second gear 55c, but other configurations may be used as long as they can transmit rotation to the shaft member 54.

[0043] As shown in FIGS. 4 and 5, the advancing / retreating mechanism 56 is mainly composed of an advancing / retreating case 57, a screw shaft 58, an operation box 59, and an advancing / retreating operation handle 56a serving as a handle.

[0044] The retractable case 57 is mainly composed of a first separate case 57a and a second separate case 57b. The first separate case 57a and the second separate case 57b are fixed together with bolts. The retractable case 57 also houses a part of the rotary motor 55a, which constitutes the drive mechanism 55, as well as the first gear 55b and the second gear 55c.

[0045] First separate case 57a has a through hole 57c formed in the center thereof that passes through in the up-down direction, and a screw shaft 58 is inserted into through hole 57c. An internal thread that corresponds to screw shaft 58 is formed on the inner periphery of through hole 57c. In other words, as screw shaft 58 inserted into through hole 57c rotates, first separate case 57a can move forward and backward relative to screw shaft 58 without rotating.

[0046] Furthermore, a bearing 57d is provided between the first separate case 57a and the upper end of the shaft member 54, allowing the shaft member 54 to rotate smoothly relative to the first separate case 57a.

[0047] A through-hole 57e that penetrates the second separate case 57b in the vertical direction is formed in the center, and a screw shaft 58 and a shaft member 54 are inserted into the through-hole 57e. The screw shaft 58 is inserted into the center of the shaft member 54 from above. A bearing 57f is provided on the inner periphery of the through-hole 57e, allowing the shaft member 54 inserted into the through-hole 57e to smoothly advance and retreat and rotate relative to the second separate case 57b.

[0048] 5, the advance / retract case 57 is attached to a pair of support columns 56c, 56d so as to be slidable along the longitudinal direction. Both ends of the support columns 56c, 56d in the longitudinal direction are fixed by bolts between the connection flange 53 and the operation box 59. One of the support columns, 56c, is provided with a scale.

[0049] As shown in FIGS. 4 and 5, the operation box 59 is mainly composed of an operation case 59a, a first input shaft 59b, and a second input shaft 59c.

[0050] The operation case 59a is open upward, and a first input shaft 59b protrudes upward from the opening. The operation case 59a also has a branch portion 59d that opens to the side, and a second input shaft 59c protrudes laterally from the opening of the branch portion 59d. Furthermore, the operation case 59a is provided with cover members 59e and 59f that surround the outer peripheries of the first input shaft 59b and the second input shaft 59c in the circumferential direction, respectively.

[0051] The first input shaft 59b is the upper end of the screw shaft 58 formed in a rectangular parallelepiped shape. That is, the screw shaft 58 can be rotated by attaching the advance / retract operation handle 56a to the first input shaft 59b and rotating it. In this embodiment, the end face of the first input shaft 59b is recessed into a rectangular shape in a plan view. As shown in the area enclosed by a chain line in FIG. 4, the first input shaft 59b can be rotated by fitting the rectangular protruding tip end 56b of the advance / retract operation handle 56a onto the first input shaft 59b.

[0052] 4, the second input shaft 59c is formed in the same rectangular parallelepiped shape as the first input shaft 59b. A second gear 59h is fixed to the tip of the second input shaft 59c, which extends perpendicular to the first input shaft 59b.

[0053] The second gear 59h is externally circumscribed by a first gear 59g fixed to the screw shaft 58. The first gear 59g and the second gear 59h are bevel gears. That is, the screw shaft 58 can be rotated by attaching an advance / retract operation handle 56a to the second input shaft 59c and rotating it. The end face of the second input shaft 59c is recessed in a rectangular shape, the same shape as the first input shaft 59b. The tip end 56b of the advance / retract operation handle 56a is fitted onto this second input shaft 59c, enabling rotation.

[0054] The number of teeth of the second gear 59h is smaller than the number of teeth of the first gear 59g. In this embodiment, the number of teeth of the second gear 59h is half the number of teeth of the first gear 59g. As a result, the rotation of the threaded shaft 58 when the advance / retract operation handle 56a is attached to the second input shaft 59c and rotated once is half the rotation of the threaded shaft 58 when the advance / retract operation handle 56a is attached to the first input shaft 59b and rotated once, i.e., a 180-degree rotation. In other words, the axial feed amount of the cutter 52 and the shaft member 54 when the advance / retract operation handle 56a is attached to the second input shaft 59c and rotated once is half the axial feed amount of the cutter 52 and the shaft member 54 when the advance / retract operation handle 56a is attached to the first input shaft 59b and rotated once.

[0055] By attaching a forward / backward operation handle 56a to the first input shaft 59b or the second input shaft 59c and rotating it, the screw shaft 58 rotates, and the forward / backward movement case 57 and the drive mechanism 55 move forward and backward together with the cutter 52 and the shaft member 54. Therefore, the forward / backward movement case 57 comes into contact with the connection flange 53 (see the dashed line portions in Figures 4 and 5), making it possible to restrict the movement of the cutter 52 and the shaft member 54.

[0056] Next, the process of drilling the fluid pipe 1 using the drilling machine 5 will be described.

[0057] First, connect the drain hose and chip collector to the drain pipe. In this state, as shown in FIG. 6 , manually rotate the advance / retract operation handle 56a attached to the first input shaft 59b to rotate the screw shaft 58 forward, thereby advancing the cutter 52 and shaft member 54 toward the fluid pipe 1 within the branch section 2a of the branch housing 2. When the tip of the center drill 52b contacts the top of the peripheral wall of the fluid pipe 1, and the change in resistance transmitted to the hand via the advance / retract operation handle 56a is detected, the rotation of the advance / retract operation handle 56a is stopped. After confirming that the tip of the center drill 52b has contacted the top of the peripheral wall of the fluid pipe 1, the advance / retract operation handle 56a may be rotated back several times to slightly retract the tip of the center drill 52b from the top of the peripheral wall of the fluid pipe 1.

[0058] Then, the hydraulic unit and the rotary motor 55a (not shown) are started to rotate the cutter 52 and the shaft member 54. At this time, the screw shaft 58 does not rotate due to the influence of vibrations transmitted from the drive mechanism 55 or changes in the fluid pressure acting on the cutter 52 inside the branch portion 2a, so that the cutter 52 and the shaft member 54 are prevented from moving back and forth unexpectedly.

[0059] Next, as shown in Figure 7, the advance / retract operation handle 56a is removed from the first input shaft 59b and attached to the second input shaft 59c. After the advance / retract operation handle 56a is attached to the second input shaft 59c, the hydraulic unit and the rotary motor 55a may be started to rotate the cutter 52 and the shaft member 54. By rotating the advance / retract operation handle 56a attached to the second input shaft 59c and rotating the screw shaft 58 in the forward direction, the cutter 52 and the shaft member 54 are advanced further toward the fluid pipe 1 within the branch section 2a of the branch housing 2, thereby cutting the fluid pipe 1. Cutting chips generated when the cutter 52 cuts the fluid pipe 1 can be discharged to the outside together with the fluid through a drain port (not shown) of the branch housing 2.

[0060] In this way, by rotating the handle 56a for advancing and retreating operation attached to the second input shaft 59c, the axial feed amount of the cutter 52 and the shaft member 54 becomes smaller compared to when the handle 56a for advancing and retreating operation attached to the first input shaft 59b is rotated (see Figure 6), and therefore the advancement speed of the cutter 52 and the shaft member 54 can be slowed down.

[0061] The resistance force transmitted to the operator's hand via the advance / retract operation handle 56a changes gradually as the cutter 52 cuts the peripheral wall of the fluid pipe 1. Specifically, the resistance force is small while the center drill 52b advances, drilling a hole in the top of the peripheral wall of the fluid pipe 1. As the cutter 52 advances, the resistance force begins to increase when the cutting blades 52e of the cylindrical member 52a come into contact with the peripheral wall of the fluid pipe 1 at two points in the axial direction of the peripheral wall of the fluid pipe 1 that sandwich the center drill 52b. As the cutter 52 advances, the resistance force changes depending on the state of contact between the cutting blades 52e of the cylindrical member 52a and the peripheral wall of the fluid pipe 1. Then, as the cutting blades 52e of the cylindrical member 52a penetrate the peripheral wall of the fluid pipe 1 along its entire circumference, cutting off a portion of the peripheral wall of the fluid pipe 1, the resistance force decreases.

[0062] By appropriately adjusting the rotation of the advance / retract operation handle 56a while understanding the change in the resistance force transmitted to the hand through the advance / retract operation handle 56a and controlling the advancement speed of the cutter 52 and the shaft member 54, it is possible to prevent the friction force generated between the cutter 52 and the peripheral wall of the fluid pipe 1 from becoming excessively large.

[0063] Incidentally, in conjunction with the rotational operation of the forward / backward operation handle 56a, the rotation speed and torque of the cutter 52 and the shaft member 54 by the drive mechanism 55 may be appropriately adjusted to further prevent the frictional force generated between the cutter 52 and the peripheral wall of the fluid pipe 1 from becoming excessively large. For example, the aforementioned hydraulic unit connected to the rotary motor 55a may have a flow rate adjustment unit and a pressure adjustment unit for the hydraulic oil, and the operator may operate these adjustment units to appropriately adjust the pressure and flow rate of the hydraulic oil supplied to the rotary motor 55a, that is, to appropriately adjust the rotation speed and torque of the shaft member 54.

[0064] In addition, the axial feed amount of the cutter 52 and the shaft member 54 from the position where the tip of the center drill 52b contacts the top of the peripheral wall of the fluid pipe 1 until a portion of the peripheral wall of the fluid pipe 1 is cut off, and the drilling status of the fluid pipe 1 by the cutter 52 can be visually grasped from outside the branch housing 2 by using the scale provided on the support 56c.

[0065] 8, the handle 56a for movement operation is removed from the second input shaft 59c and attached to the first input shaft 59b. The handle 56a for movement operation attached to the first input shaft 59b is rotated to reversely rotate the screw shaft 58, thereby causing the cutter 52 and the shaft member 54 to move backward within the branch section 2a of the branch housing 2.

[0066] At this time, as shown by the solid line within the dashed line in Figure 8, the holder 52c expands radially outward from the outer circumferential surface of the center drill 52b. As a result, the piece 1a of the fluid pipe 1 cut by the cutter 52 is locked by the holder 52c and held inside the cylindrical member 52a. Note that while the center drill 52b is drilling the peripheral wall of the fluid pipe 1, the holder 52c is stored radially inward from the outer circumferential surface of the center drill 52b.

[0067] In this way, by rotating the handle 56a for advancing and retreating operation attached to the first input shaft 59b, the feed amount of the cutter 52 and the shaft member 54 becomes larger than when the handle 56a for advancing and retreating operation attached to the second input shaft 59c is rotated (see Figure 7), and therefore the advancement speed of the cutter 52 and the shaft member 54 can be increased.

[0068] Finally, the working valve handle 44 of the working valve 4 is rotated to rotate the valve stem 43 in the forward direction, causing the valve body 42 to advance toward the branching portion 2a and seat on the valve seat 2d, thereby closing the inside of the branching housing 2.

[0069] In this way, while maintaining an uninterrupted flow state, a portion of the peripheral wall of the fluid pipe 1 can be cut, the drilling machine 5 together with the mounting flange tube 7 can be removed from the branching portion 2a of the branching housing 2, and the cut piece 1a can be recovered.

[0070] As described above, in the drilling machine 5 of this embodiment, by rotating the advance / retraction operation handle 56a attached to the first input shaft 59b of the advance / retraction mechanism 56, the axial feed amount of the cutter 52 and the shaft member 54 increases, and the advancement speed of the cutter 52 and the shaft member 54 until they approach the fluid pipe 1 can be increased. Furthermore, by rotating the advance / retraction operation handle 56a attached to the second input shaft 59c, the axial feed amount of the cutter 52 and the shaft member 54 decreases, and the advancement speed of the cutter 52 and the shaft member 54 in the process of cutting the peripheral wall of the fluid pipe 1 can be slowed. In other words, the drilling machine 5 can switch the axial feed amount of the cutter 52 and the shaft member 54 between two stages depending on the rotation amount of the advance / retraction operation handle 56a, and the advancement speed of the cutter 52 can be easily controlled by manually rotating the advance / retraction operation handle 56a. Therefore, during the process of cutting the peripheral wall of the fluid pipe 1, the friction force generated between the cutter 52, particularly the cutting blade 52e of the cylindrical member 52a, and the peripheral wall of the fluid pipe 1 is prevented from becoming excessively large, thereby preventing wear and damage to the cutter 52.

[0071] The cutter 52 also has a center drill 52b that protrudes in the advancing direction. As a result, when it is determined that the center drill 52b has come into contact with the top of the peripheral wall of the fluid pipe 1, the axial feed amount of the cutter 52 and the shaft member 54 can be switched to be reduced.

[0072] Furthermore, by penetrating the center drill 52b into the peripheral wall of the fluid pipe 1, the peripheral wall of the fluid pipe 1 can be cut while the position of the cutting blade 52e of the cylindrical member 52a relative to the fluid pipe 1 is stabilized.

[0073] The center drill 52b also includes a holder 52c for collecting the cut piece 1a of the fluid pipe 1. As a result, after cutting a portion of the peripheral wall of the fluid pipe 1, the advance / retract operation handle 56a is attached to the first input shaft 59b, and the advance / retract operation handle 56a is rotated to increase the axial feed amount of the cutter 52 and the shaft member 54, thereby allowing the section 1a of the fluid pipe 1 held by the holder 52c to be collected in a short time.

[0074] The advancing / retreating mechanism 56 also includes a first input shaft 59b and a second input shaft 59c that have different axial feed amounts per rotation of the advancing / retreating operation handle 56a. This makes it possible to switch the axial feed amount of the cutter 52 and the shaft member 54 by rotating the advancing / retreating operation handle 56a attached to the first input shaft 59b or the second input shaft 59c. In other words, the advancing / retreating mechanism 56 can switch the axial feed amount of the cutter 52 and the shaft member 54 with a simple structure.

[0075] Furthermore, since the advance / retract operation handle 56a is detachable from the first input shaft 59b or the second input shaft 59c, one advance / retract operation handle 56a can be connected to multiple input shafts, thereby enabling a compact configuration of the drilling machine 5. Furthermore, by removing the advance / retract operation handle 56a from an unused input shaft, interference caused by the rotation of the unused input shaft can be avoided when manually rotating the advance / retract operation handle 56a.

[0076] Furthermore, since the first input shaft 59b and the second input shaft 59c are each surrounded by cover members 59e and 59f in the circumferential direction on their outer peripheries, it is possible to prevent accidents caused by contact with or getting caught in an unused input shaft to which the advance / retract operation handle 56a cannot be attached when rotating the advance / retract operation handle 56a.

[0077] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0078] For example, in the above embodiment, the tip of the center drill 52b comes into contact with the top of the peripheral wall of the fluid pipe 1, and the axial feed amount of the cutter 52 and the shaft member 54 is switched by rotating the advance / retract operation handle 56a. However, this is not limited to this. The axial feed amount of the cutter 52 and the shaft member 54 may be switched when the center drill 52b advances while drilling the top of the peripheral wall of the fluid pipe 1, and the cutting blade 52e of the cylindrical member 52a comes into contact with the peripheral wall of the fluid pipe 1, and the resistance force transmitted to the hand via the advance / retract operation handle 56a becomes large.

[0079] In addition, by using the scale provided on the support 56c as a reference to determine the relative position between the cutter 52 and the peripheral wall of the fluid pipe 1, the axial feed amount of the cutter 52 and the shaft member 54 can be switched when the cutter 52 approaches the top of the peripheral wall of the fluid pipe 1.

[0080] Furthermore, in the above embodiment, the drilling machine 5 has been described as being capable of switching the axial feed amount of the cutter 52 and the shaft member 54 between two stages by rotating the forward / backward operation handle 56a, but this is not limited to this, and the drilling machine may also be capable of switching the feed amount between three or more stages.

[0081] In addition, in the above embodiment, the number of teeth of the second gear 59h fixed to the second input shaft 59c is half the number of teeth of the first gear 59g fixed to the first input shaft 59b, that is, the axial feed amount of the cutter 52 and the shaft member 54 by rotating the advance / retract operation handle 56a attached to the second input shaft 59c is half the axial feed amount of the cutter 52 and the shaft member 54 by rotating the advance / retract operation handle 56a attached to the first input shaft 59b. However, this is not limited to this, and by changing the number of teeth of each gear, the reduction ratio by switching the axial feed amount of the cutter 52 and the shaft member 54 may be, for example, 1 / 3 or 1 / 4.

[0082] Furthermore, in the above embodiment, the axial feed amount of the cutter 52 and the shaft member 54 is switched by changing the input shaft that is rotated using the advance / retract operation handle 56a. However, this is not limited to this. The advance / retract operation handle may be fixedly attached to one input shaft, and the advance / retract operation means may be configured to be able to switch the type of gear circumscribing the gear fixed to the input shaft, thereby making it possible to switch the axial feed amount of the cutter 52 and the shaft member 54.

[0083] In addition, in the above embodiment, an example was described in which at least a portion of the peripheral wall of the fluid pipe 1 was cut off using a drilling machine 5 having a cutter 52, but this is not limited to this, and the drilling machine may also be configured to cut off a portion of the fluid pipe 1 in the circumferential direction.

[0084] Furthermore, the cutter 52 may be formed of only the cylindrical member 52a and may not include a center drill. [Explanation of symbols]

[0085] 1 Fluid tube 1a intercept Two-part housing 4. Working valve 5 Drilling machine 7 Mounting flange cylinder 52 cutter 52a Cylindrical member 52b center drill 52c Retainer (recovery means) 53 Connection flange 54 Shaft member 55 Drive mechanism (drive means) 56 Advancement / retraction mechanism (advancement / retraction operation means) 56a Advance / retreat handle (handle) 57 Advance / Retreat Case 58 Screw shaft 59 Operation box 59b First input shaft 59c Second input shaft 59e, 59f Cover member 59g 1st gear 59h 2nd gear

Claims

1. A drilling machine for drilling a portion of a fluid pipe in an uninterrupted flow state, comprising: a shaft member having a cutter attached to a tip thereof; a driving means for rotating the cutter and the shaft member around the axis of the shaft member; an advancing / retracting operation means for advancing / retracting the cutter and the shaft member in the axial direction of the shaft member by manually rotating a handle; and an advancing / retracting case for accommodating at least a portion of the driving means, The advance / retract operation means is capable of switching the axial feed amount of the cutter and the shaft member between at least two stages in accordance with the amount of rotation of the handle, and the advance / retract case is formed with a through hole through which the shaft member is inserted.

2. The drilling machine according to claim 1, wherein the cutter is provided with a center drill that protrudes in the advancing direction.

3. 3. The drilling machine according to claim 2, wherein the center drill is provided with a recovery means for recovering the cut pieces of the fluid pipe.

4. 4. The drilling machine according to claim 1, wherein the forward / backward operation means comprises at least a first input shaft and a second input shaft which have different axial feed amounts per one rotation of the handle.

5. 5. The drilling machine according to claim 4, wherein the handle is detachable from the first input shaft and the second input shaft.

6. The drilling machine according to claim 4 or 5, further comprising a cover member that surrounds the outer periphery of each of the first input shaft and the second input shaft in the circumferential direction.

7. 2. The drilling machine according to claim 1, wherein an internal thread corresponding to the shaft member is formed on the inner periphery of the through hole.

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