CN112427690B

CN112427690B - Electric tapping machine

Info

Publication number: CN112427690B
Application number: CN202011474547.7A
Authority: CN
Inventors: 焦祥静
Original assignee: ANHUI TONGFA EQUIPMENT CO LTD
Current assignee: ANHUI TONGFA EQUIPMENT CO LTD
Filing date: 2020-12-14
Publication date: 2024-07-02
Anticipated expiration: 2040-12-14

Abstract

The invention provides an electric tapping machine, wherein a drill rod is arranged in a pipe cavity of a tubular body, the drill rod connected with a feed mechanism and a rotary driving mechanism performs circumferential rotation and axial displacement movement in a sealed cavity of the tubular body, the rotary driving mechanism comprises a motor, the motor is connected with the drill rod through a transmission mechanism, a composite drilling tool is arranged at the end part of the drill rod exposed at the lower end of the tubular body, the composite drilling tool comprises a drilling cutter disc with a tool arranged at the disc edge, a positioning hole drilling tool is arranged at the center of the drilling cutter disc, a cutting blade of the positioning hole drilling tool protrudes below a cutting surface at the lower end of the drilling cutter disc, the positioning hole drilling tool, the drilling cutter disc and the drill rod are arranged in the same core, a pipe clamp or a half joint B is connected on a pipe joint on the pipe clamp or the half joint B in a sealing way, and the ball valve C is connected with the lower end of the tubular body in a sealing way. Solves the problem of large hole opening and improves the operation efficiency.

Description

Electric tapping machine

Technical Field

The invention relates to a perforating device, in particular to a perforating device which is used for perforating through holes on parts such as pipelines and the like installed and on site so as to input or output media.

Background

In the prior art, similar components such as pipelines are installed, holes are formed in the pipelines for accessing branches for various reasons, and obviously, the holes are formed in the field, so that the problem to be solved is urgent, large or professional hole forming equipment is difficult to reach the field for implementation, and particularly, the pipelines installed in the field are always in a working state of normally conveying media, and the holes are limited by various factors. Since the pipe fitting of the pipe a to be perforated is sometimes large, it is quite common that the pipe diameter is 300mm or even larger, and for the large pipe fitting, the pipe a to be perforated sometimes needs a branch pipe pipeline adapted to the pipe a, and the situation that the aperture of the perforated pipe is 200mm is quite common. Because the aperture of the drilled hole is large, the drill bit is generally difficult to be qualified, and more chip scraps are generated during the drilling, and the chip scraps are left in the pipeline A to be drilled and are obviously not enough, because the pipeline is seriously blocked and even safety accidents occur, and the chip scraps are taken out to be a new problem; in addition, the resistance is also large when a large-aperture hole needs to be formed, so manual operation is very difficult, time and labor are wasted, and the efficiency is low.

Disclosure of Invention

The invention discloses an electric tapping machine, which utilizes external power to drive a cutter to rotate so as to improve tapping efficiency.

In order to achieve the above purpose, the invention adopts the following technical scheme that an electric tapping machine is provided with a drill rod in a pipe cavity of a tubular body, and the drill rod connected with a feed mechanism and a rotary driving mechanism performs circumferential rotation and axial displacement movement in a sealed cavity of the tubular body, and is characterized in that: the rotary driving mechanism comprises a motor, the motor is connected with a drill rod through a transmission mechanism, a composite drilling tool is arranged at the end part of the drill rod exposed at the lower end of the tubular body, the composite drilling tool comprises a drilling cutter disc arranged at the disc edge, a locating hole drilling tool is arranged at the center of the drilling cutter disc, a cutting blade of the locating hole drilling tool protrudes to the lower part of a cutting face at the lower end of the drilling cutter disc, the locating hole drilling tool, the drilling cutter disc and the drill rod are arranged in a concentric manner, a pipe clamp or a half joint B is connected to a pipe to be drilled on a pipeline A in a sealing manner, a ball valve C is connected to a pipe joint on the pipe clamp or the half joint B in a sealing manner, and the ball valve C is connected with the lower end of the tubular body in a sealing manner.

According to the scheme, the composite drilling tool is provided, the positioning hole is formed in the pipeline A to be drilled by the positioning hole drilling tool, then the drilling cutter head is used for forming holes with required hole diameters, the operation of forming holes and adding the branch pipes is ensured to be finished on line under the condition that the pipeline A to be drilled normally runs and conveys media through sealing connection among all the components, and the composite drilling tool is driven to rotate by electric power, so that the problem of forming large holes is solved, and the operation efficiency is improved. Drawings

FIG. 1 is a schematic diagram of the structure of the invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3a, 3b are schematic structural views of another embodiment.

Detailed Description

In the tapping machine shown in fig. 1, a drill rod 20 is arranged in a pipe cavity of a tubular body 10, the drill rod 20 connected with a feed mechanism 60 and a rotary driving mechanism 70 performs circumferential rotation and axial displacement movement in a sealed cavity of the tubular body 10, the rotary driving mechanism 70 comprises a motor 71, the motor 71 is connected with the drill rod 20 through a transmission mechanism, a compound drilling tool is arranged at the end part of the drill rod 20 exposed at the lower end of the tubular body 10, the compound drilling tool comprises a drilling cutter disc 30 with a tool 31 arranged at a disc edge, a positioning hole drilling tool 40 is arranged at the center of the drilling cutter disc 30, a cutting blade 41 of the positioning hole drilling tool 40 protrudes below a cutting surface at the lower end of the drilling cutter disc 30, the positioning hole drilling tool 40, the drilling cutter disc 30 and the drill rod 20 are concentrically arranged, a pipe clamp or a half joint B is connected on a pipe joint on the pipe clamp or the half joint B in a sealing way, and a ball valve C is connected with the lower end of the tubular body 10 in a sealing way.

In the present invention, the definition of the positional relationship between the upper and lower parts is described based on the state shown in the drawings. Alternatively, the ball valve C may be a gate valve.

For the occasion with larger pipe diameter, if the pipe diameter of the pipe A to be perforated is 300mm or even larger, the pipe diameter of the pipe joint on the pipe clamp or the half joint B can reach 200mm, the composite drilling tool provided by the invention is utilized to firstly drill a positioning hole by the positioning hole drilling tool 40 and then drill a hole with a required aperture by the drilling cutter disc 30, thereby effectively solving the practical requirements of perforating and additionally installing a branch pipe pipeline. The pipe clamp or the half joint B can be reliably and fixedly connected to the pipeline A to be drilled, sealing is established around the area to be drilled, the pipe joint on the pipe clamp or the half joint B is in sealing connection with the ball valve C, sealing connection is implemented between the ball valve C and the tubular body 10, the composite drilling tool is ensured to be positioned in a complete sealing cavity, the ball valve C is opened to form a passage in the valve, and the tool can directly reach the pipeline A to be drilled through the ball valve C.

The preferred scheme is that the drilling cutterhead 30 is cylindrical, and the central part of the cylinder top 32 of the drilling cutterhead 30 and the upper end of the locating hole drilling tool 40 are connected with the lower end of the drill rod 20. The choice of the cylindrical shape of the drill cutterhead 30 not only ensures the problem of arranging the hole drilling tools, but also ensures sufficient torsion resistance when subjected to a large reaction torque during the drilling process, and in addition reserves space for fixing the hole drilling tools 40. In addition, in order to form large holes, save physical strength and improve the punching efficiency, it is necessary to drive the drill cutterhead 30 by electric power.

The invention aims to take out the chip scraps as much as possible because the aperture to be drilled is large, and therefore, the invention provides the following preferred scheme that a cutter bar body at the upper part of a cutting knife 41 of a positioning hole drilling cutter 40 is provided with a one-way check claw 42, and the one-way check claw 42 is radially folded to be in a radial protruding state when being radially restrained to be in a flush position with the rod body of the drill rod 20 and the radial restraint is released when the drill rod 20 moves downwards; when the one-way check claw 42 is higher than the height of the cutting surface at the lower end of the drill cutterhead 30, the height difference between the one-way check claw 42 and the cutting surface at the lower end of the drill cutterhead 30 is smaller than the height difference between the highest position and the lowest position of the drilled hole, which is also the highest position of the one-way check claw 42 relative to the drill cutterhead 30, and below the highest position, the one-way check claw 42 can reach the bottom surface of the hole drilled by the positioning hole drilling tool 40, and at the moment, the drill cutterhead 30 does not completely drill through the pipe wall yet. The waste materials cut off during the hole opening of the invention are annular whole bodies, so that Xu Feixie generated by drilling of the positioning hole drilling tool 40 is omitted temporarily, the annular waste materials cannot fall off from the positioning hole drilling tool 40 through the free radial protruding unfolding posture of the unidirectional check claw 42 during the return stroke of the drill rod 20, the annular waste materials are lifted to the upper part of the ball valve C by the whole bodies along with the further lifting of the drill rod 20, the ball valve C is closed, the tapping machine is disassembled, and the annular waste materials are taken out, therefore, the composite tool provided by the invention is beneficial to accurately positioning the hole opening, and particularly, the waste materials can be cut into an annular whole block shape and can be taken out smoothly.

The present invention provides a simple and reliable embodiment for the check pawl 42:

the method comprises the following steps: one end of the one-way check claw 42 is hinged on the rod body of the locating hole drilling tool 40, the other end is in a free state, and the free end of the one-way check claw 42 extends to the outside of the rod body of the locating hole drilling tool 40 in a free state.

One end of the one-way check claw 42 is hinged on the rod body of the locating hole drilling tool 40 by a hinge shaft 43, and the upper and lower parts of the notch part on the rod body of the locating hole drilling tool 40 form upper and lower limit stops 44 and 45 for limiting the rotation range of the one-way check claw 42.

The arrangement of the concave part provides a furled accommodating space for the unidirectional check claw 42, ensures that the unidirectional check claw 42 leans against the rod body of the locating hole drilling tool 40 when furled, so as to ensure that the rod body of the locating hole drilling tool 40 is prevented from interfering and obstructing the perforating operation when drilling, meanwhile, the upper and lower concave wall surfaces of the concave part naturally form upper and lower limit stops 44 and 45, the upper limit stop 44 ensures that the gravity center of the unidirectional check claw 42 is positioned at the outer side of the hinging shaft when furled within the section range of the rod body, and the free state only has the movement trend of outward swinging when in the free state, so that the free end of the unidirectional check claw is overhanging to the outside of the rod body of the locating hole drilling tool 40.

And two,: the one-way check claw 42 is a U-shaped or L-shaped rod, the shaft of the positioning hole drilling tool 40 is provided with a radial through hole for the bottom rod 421 of the one-way check claw 42 to pass through, the arm rod 422 of the one-way check claw 42 is positioned outside the through hole and is in free swing state, the shaft of the positioning hole drilling tool 40 is provided with a groove part, the through hole is arranged on the bottom of the groove, and the lower groove wall is highly matched with the lower edge of the through hole. As shown in fig. 3a and 3b, the shaft of the pilot hole drilling tool 40 has a radial through hole, the bottom bar 421 of the U-shaped bar forming the one-way check claw 42 is located in the through hole, the arm bar 422 is located outside the through hole, the groove portion of the shaft of the pilot hole drilling tool 40 can ensure that the arm bar can be flush with the groove bottom portion when swinging upwards, and the arm bar 422 is located in the groove cavity, so that the hole can be smoothly opened, the arm bar 422 falls down and is attached to the lower groove wall under the dead weight after passing through, and the annular waste can be lifted up together during return. In the case of the L-shaped rod, only one end of the bottom rod is required to be considered to be provided with an anti-drop cap.

In order to maintain the cut-off posture and position of the annular waste substantially maintained for removal, the one-way check claws 42 are arranged at intervals of 2 to 3 in the circumferential direction, so that it is ensured that the annular waste is restrained on the shaft of the pilot hole drilling tool 40 at the upper portion of the one-way check claws 42 in a smooth posture. The broken line in fig. 2 is a state in which the one-way check pawl 42 is convexly suspended.

Another aspect of the pilot hole drilling tool 40 of the present invention functions to locate the annular scrap which would otherwise be difficult to remove.

The upper end of the pilot hole drilling tool 40 is provided with a radially extending flange 46, the lower end of the drill rod 20 is provided with a T-shaped head 21, and the T-shaped head 21, the cylinder top 32 and the flange 46 are sequentially bonded from top to bottom and are connected by bolts 47.

The middle part of the cylinder top 32 is provided with a positioning hole 321, and a lower convex column 211 at the lower end of the T-shaped head 21 and an upper convex column 461 at the upper end of the flange 46 are concentrically inserted into the positioning hole 321. When the one-way check claw 42 is higher than the height of the cutting surface at the lower end of the drill cutterhead 30, the height difference between the one-way check claw 42 and the cutting surface at the lower end of the drill cutterhead 30 is smaller than the height difference between the highest position and the lowest position of the perforated hole edge. The scheme realizes concentric positioning among the three by a very simple scheme.

In view of the fact that the pipe diameter of the pipe A to be perforated is large, in order to ensure the connection reliability and also adapt to the connection of the large-size ball valve C, the invention adopts the following preferred connection scheme, the lower end of the pipe tubular body 10 is provided with a connection ring 50, the upper end face of the connection ring 50 and the lower end face of the pipe tubular body 10 are detachably connected by bolts, and the lower end of the connection ring 50 is provided with a threaded hole 51 and a ball valve C

The flange is connected through bolts. The connecting ring 50 is a transition piece, and only one standard tapping machine is needed to adapt to the ball valve C with various standards.

Referring to fig. 1, the transmission mechanism between the motor 71 and the drill rod 20 includes a flexible shaft 80 with one end connected to a motor shaft 711, the flexible shaft 80 is disposed in an outer sheath 81, the outer sheath 81 is in threaded connection with a pipe joint 712 connected to a machine base at the periphery of the motor shaft 711, the other end of the inner sheath 81 is connected to a pipe seat 911 on a casing 91 of the gear transmission mechanism 90, a bevel gear 92 and a bevel gear 93 meshed with each other are disposed in the casing 91, the bevel gear 92 is connected to the flexible shaft 80, the bevel gear 93 is fixed at the end of the drill rod 20, an outer pipe 100 is disposed outside the drill rod 20, the casing 91 is fixedly connected to the upper end of the outer pipe 100, a rack 101 is disposed on the outer wall of the outer pipe 100, a transmission case 61 is disposed at the upper portion of the tubular body 10, a handle 62 and a gear 63 are disposed on the transmission case 61, the gear 63 is meshed with the rack 101, a guide bar 102 disposed along the length direction of the pipe is fitted with a guide groove on the inner pipe wall of the tubular body 10 to form a circumferential limit displacement of the outer pipe 100.

As shown, the pipe joint 712 is an externally threaded inner cone pipe type pipe joint, the end of the outer sheath 81 has a nut sleeve connected with the pipe joint 712, and the outer cone pipe section at the end of the outer sheath 81 is matched with the inner cone pipe section of the pipe joint 712, and the connection structure between the other end of the outer sheath 81 and the pipe seat 911 on the chassis 91 is also basically the same, and will not be described in detail. A worm and gear transmission mechanism can be additionally arranged between the handle 62 and the gear 63 to realize turning, speed changing and torque amplification, so that the outer tube 100 is driven to synchronously move downwards along with the drill rod 20 for feeding.

The top 32 of the cutter 30 is provided with a through hole 322, and the lower part of the tubular body 10 is connected with the side switch valve 110 to be communicated with the lower chamber of the tubular body 10. The switch valve 110 and the through hole 322 are arranged, so that arc extinguishing medium or fire extinguishing agent and cooling liquid can be conveyed to the drilling part of the cutter, sparks are avoided, and the cutter is cooled.

Upper and lower end face thrust bearings 103 and 104 are arranged between the upper and lower ends of the outer tube 100 and the drill rod 20, sealing is arranged between the outer tube 100 and the drill rod 20 at the positions of the upper and lower end face thrust bearings 103 and 104, a sealing piece 105 is arranged at the matching position of the lower end of the outer tube 100 and the tubular body 10, the outer tube 100 is sleeved on the inner tube 106, and the guide bars 102 are matched with guide grooves on the inner tube wall of the inner tube 106. The end face thrust bearing is arranged, so that the axial force in the up-down direction is transmitted, and friction generated by mutual rotation between the end face thrust bearing and the end face thrust bearing can be reduced; in addition, the inner tube 106 added in the outer tube 100 can be made of a material with excellent wear resistance to improve the guiding cooperation with the guide bar 102, and in addition, under the cooperation of the guide bar 102 and the guide groove, the outer tube 100 has no possibility of circumferential rotation, so that the gear 63 and the rack 101 are meshed stably and reliably, and as shown in the figure, the rack 101 and the guide bar 102 are arranged on the tube wall of the outer tube 100 opposite to each other.

Claims

1. An electric tapping machine, a drill rod (20) is arranged in a pipe cavity of a tubular body (10), and the drill rod (20) connected with a feed mechanism (60) and a rotary driving mechanism (70) performs circumferential rotation and axial displacement movement in a sealed cavity of the tubular body (10), and is characterized in that: the rotary driving mechanism (70) comprises a motor (71), the motor (71) is connected with the drill rod (20) through a transmission mechanism, a compound drilling tool is arranged at the end part of the drill rod (20) exposed at the lower end of the tubular body (10), the compound drilling tool comprises a drilling cutter disc (30) with a tool (31) arranged at the disc edge, a positioning hole drilling tool (40) is arranged at the center of the drilling cutter disc (30), a cutting tool (41) of the positioning hole drilling tool (40) protrudes to the lower part of a cutting surface at the lower end of the drilling cutter disc (30), the positioning hole drilling tool (40), the drilling cutter disc (30) and the drill rod (20) are concentrically arranged, a pipe clamp or a half joint B is connected to a pipe joint on a pipeline to be perforated in a sealing manner, a ball valve C is connected to the pipe joint on the pipe clamp or the half joint B in a sealing manner, and the ball valve C is connected with the lower end of the tubular body (10) in a sealing manner.

2. The electric tapping machine according to claim 1, wherein: the drilling cutterhead (30) is cylindrical, and the central part of a cylinder top (32) of the drilling cutterhead (30) and the upper end of the positioning hole drilling tool (40) are connected with the lower end of the drill rod (20).

3. An electric tapping machine according to claim 1 or 2, characterized in that: a one-way check claw (42) is arranged on the cutter bar body at the upper part of the cutting knife (41) of the positioning hole drilling cutter (40), and the one-way check claw (42) is radially restrained to be folded to be flush with the rod body of the drill rod (20) along with the downward movement of the drill rod (20); when the one-way check claw (42) is higher than the height of the cutting surface at the lower end of the drilling cutter head (30), the height difference between the one-way check claw (42) and the cutting surface at the lower end of the drilling cutter head (30) is smaller than the height difference between the highest position and the lowest position of the perforated hole edge.

4. An electric tapping machine as claimed in claim 3, characterized in that: one end of the one-way check claw (42) is hinged on the rod body of the locating hole drilling tool (40), the other end of the one-way check claw is in a free state, the free end of the one-way check claw (42) is cantilevered to the outside of the rod body of the locating hole drilling tool (40) in the free state, one end of the one-way check claw (42) is hinged on the rod body of the locating hole drilling tool (40) through a hinge shaft (43), the upper part and the lower part of a notch part on the rod body of the locating hole drilling tool (40) form an upper limit stop (44) and a lower limit stop (45) for limiting the rotation range of the one-way check claw (42), and 2-3 one-way check claws (42) are arranged at intervals in the circumferential direction.

5. An electric tapping machine as claimed in claim 3, characterized in that: the one-way check claw (42) is a U-shaped or L-shaped rod, a radial through hole is formed in the rod body of the positioning hole drilling tool (40) for the bottom rod (421) of the one-way check claw (42) to pass through, the arm rod (422) of the one-way check claw (42) is positioned outside the through hole and is in free swing state, a groove part is formed in the rod body of the positioning hole drilling tool (40), the through hole is formed in the bottom of the groove, and the lower groove wall is in high fit with the lower edge of the through hole.

6. An electric tapping machine according to claim 1 or 2, characterized in that: the upper end of the locating hole drilling tool (40) is provided with a radial extending flange disc (46), the lower end of the drill rod (20) is provided with a T-shaped head (21), and the T-shaped head (21), the cylinder top (32) and the flange disc (46) are sequentially bonded from top to bottom and are connected through bolts (47).

7. The electric tapping machine according to claim 6, wherein: the middle part of the cylinder top (32) is provided with a positioning hole (321), and a lower convex column (211) at the lower end of the T-shaped head (21) and an upper convex column (461) at the upper end of the flange disc (46) are concentrically inserted into the positioning hole (321).

8. The electric tapping machine according to claim 1, wherein: the lower end of the tubular body (10) is provided with a connecting ring (50), the upper end face of the connecting ring (50) is detachably connected with the lower end face of the tubular body (10) through bolts, and the lower end of the connecting ring (50) is provided with a threaded hole (51) which is connected with a flange plate of the ball valve C through bolts.

9. The electric tapping machine according to claim 1, wherein: the transmission mechanism between the motor (71) and the drill rod (20) comprises a flexible shaft (80) with one end connected with a motor shaft (711), the flexible shaft (80) is arranged in an outer sheath (81), the outer sheath (81) is in threaded connection with a pipe joint (712) which is arranged on the outer periphery of the motor shaft (711) and is connected with a pipe seat (911) on a machine case (91) of the gear transmission mechanism (90), a first bevel gear (92) and a second bevel gear (93) which are meshed with each other are arranged in the machine case (91), the first bevel gear (92) is connected with the flexible shaft (80), the second bevel gear (93) is fixed at the end part of the drill rod (20), an outer pipe (100) is arranged outside the drill rod (20), the machine case (91) is fixedly connected with the upper end of the outer pipe (100), a rack (101) is arranged on the outer wall of the outer pipe (100), a transmission case (61) is arranged at the upper part of a tubular body (10), a handle (62) and a gear (63) which is connected with each other are arranged on the transmission case (61), the gear (63) is meshed with a pipe seat (911) on the machine case (91), a guide pipe is arranged on the side of the outer pipe (100) along the length direction, the guide bars (102) are matched with guide grooves on the inner pipe wall of the tubular body (10) to form up-and-down displacement matching of the circumferential limit of the outer pipe (100).

10. The electric tapping machine according to claim 2, wherein: the cylinder top (32) of the drilling cutter head (30) is provided with a through hole (322), and the lower part of the tubular body (10) is connected with a side switch valve (110) which is communicated with a cavity at the lower part of the tubular body (10).

11. The electric tapping machine according to claim 9, wherein: upper and lower end face thrust bearings (103, 104) are arranged between the upper and lower ends of the outer tube (100) and the drill rod (20), sealing is arranged between the outer tube (100) and the drill rod (20) at the positions of the upper and lower end face thrust bearings (103, 104), a sealing piece (105) is arranged at the matching position of the lower end of the outer tube (100) and the tubular body (10), the outer tube (100) is sleeved on the inner tube (106), and the guide bar (102) is matched with a guide groove on the inner tube wall of the inner tube (106).