A thick-walled metal pipe cutting machine

Abstract

The present invention discloses a thick-walled metal pipe cutting machine, comprising a tool mechanism and a feed mechanism and a rotary mechanism for driving the tool mechanism. The tool mechanism comprises a blade fixedly mounted on a tool holder, the tool holder being embedded in a mounting groove on a tool holder shaft. The rotation of the tool holder shaft is driven by a main shaft behind the tool holder, and the rotation of the main shaft is driven by a rotary mechanism. The rotary mechanism comprises a hollow output shaft, on which a large gear meshing with a power output gear is mounted. The feed of the tool holder is driven by the feed mechanism, which comprises a push rod located within the main shaft for driving the tool holder to feed. The front end of the push rod is an inclined surface, and the bottom end face of the tool holder is an inclined surface that cooperates with the push rod inclined surface for guiding. The push rod is driven by a feed screw mechanism behind the push rod. The present invention adopts a blade rolling extrusion method that does not generate cutting chips, reduces tool wear, can ensure positioning accuracy, improves cutting efficiency, and cuts pipe fittings from the inside of the pipe, resulting in a smooth cut surface.

Description

Technical field:

[0002] The invention relates to the field of pipe cutting machines, and mainly relates to a thick-walled metal pipe cutting machine. Background technology:

[0004] Currently, most handheld pipe cutters on the market use motor-driven grinding wheels or manually fed pipe cutters to cut pipes from the outside. This method is difficult to apply to the removal of large numbers of pipes in large heat exchangers.

[0005] In order to meet the needs of batch pipe cutting, most of them are produced by pipe cutting machines. For example, the existing internal metal pipe cutting machine uses a cutter head to perform circular cutting from the inside of the pipe body to the outside, which is only suitable for cutting thin-walled metal pipes. In addition, a large amount of cutting heat is generated during cutting, the friction and wear of the cutter head are serious, and the tool wear is fast; there is large vibration during cutting, it is difficult to accurately position the pipe, the tool is easy to break, and the incision is difficult to achieve the expected smoothness; a large amount of cutting chips is generated, and the cleaning of the cutting chips is difficult and time-consuming. If the chips are not cleaned up, immeasurable damage will be caused to the unit. As mentioned above, it cannot meet the requirements of cutting thick-walled metal pipe fittings from the inside of the pipeline. Summary of the invention:

[0007] The purpose of the present invention is to remedy the defects of the existing technology and provide a thick-walled metal pipe cutting machine. The cutter rolls along the pipe wall, extruding and cutting the inner wall of the pipe to meet the needs of removing thick-walled metal pipe fittings from the inside of the pipeline.

[0008] The present invention is achieved through the following technical solutions:

[0009] The cam is secured to the drive shaft and is adapted to engage the cutter head and engage with the drive gear to move the cutter head forward, the cam being secured to the drive shaft with respect to the cutter head during movement.

[0010] The blade is a circular blade, which is installed on the tool holder through a pin shaft. The front end of the tool holder shaft is covered with a positioning sleeve, and the front end of the tool holder shaft is fixedly installed with a head screw. The threaded section at the rear of the tool holder shaft that is screwed with the main shaft is a step stage, and a rear auxiliary positioning sleeve is covered between the step transition and the main shaft.

[0011] The power output gear is the output gear of the gearbox, which is outputted by the motor or the power source through the gears in the reduction box at a reduced speed step by step.

[0012] The feed screw mechanism includes a feed screw, which is coaxial with the push rod. The feed screw includes a rod body, and the rod body is provided with a protruding threaded section, and the rear end of the threaded section is screwed into the mounting hole in the middle of the rear cover plate. An opening and closing nut screwed with the feed screw is installed at the corresponding position of the threaded section. The opening and closing movement of the opening and closing nut is driven by the turntable behind it, and the rotation of the feed screw is driven by the ratchet at its front end.

[0013] The front end of the feed screw is provided with a spline, which is installed with the ratchet through a spline guide. The rotation of the ratchet is toggled by the feed pawl, and the feed pawl is driven by the swing arm. The lower end of the swing arm is rotatably installed on one side of the ratchet, and the bottom end of the swing arm is provided with a feed pawl that engages with the ratchet. A non-return ratchet that slides on the tooth back of the ratchet is installed in the inner wall of the middle shell where the ratchet is located. The upper end of the swing arm is installed at the end of the feed shaft, and the feed shaft is installed in the inner cavity of the upper end of the middle shell through a bearing seat. A feed gear is installed at the other end of the feed shaft, and the rotation of the feed gear is driven by the output shaft below it. The rear end of the output shaft is provided with a tooth segment that meshes with the feed gear for transmission.

[0014] The opening and closing nut includes an upper and lower half nut, which are located above and below the feed screw, and the inner sides of which are respectively provided with threads that screw with the feed screw. The upper and lower half nuts are respectively provided with guide grooves, and the guide grooves guide the movement up and down along the guide rails of the rear cover plate. The outer sides of the upper and lower half nuts are provided with drive pins, and the drive pins pass through the holes on the rear cover plate and are inserted into the two arc-shaped guide grooves on the turntable. The turntable is rotatably installed on the outer side of the rear cover plate, and an operating handle is installed on the outer disk.

[0015] The push rod passes through the center holes of the tool holder shaft, the main shaft and the output shaft in sequence, and a push block is provided at its rear end. The inner hole of the output shaft where the rear end of the push rod is located is a step hole. A return spring is installed on the push rod between the push block and the step where the step hole is located. The push block is in contact with the sliding bearing at the front end of the feed screw.

[0016] The guide groove at the bottom end of the knife seat is a T-shaped groove, and the T-shaped groove is inclined from one side of the knife seat to the other side, and its inclination angle is matched with the propulsion guide inclined surface. The front end end of the push rod is a T-shaped structure that cooperates with the T-shaped groove guide, and the upper end face of the T-shaped structure is the propulsion guide inclined surface.

[0017] The feed screw is a hollow rod structure with a nut screwed on its rear end. A proximity rod coaxial with the feed screw is provided behind the nut. A proximity switch is installed on the front end of the proximity rod through a proximity switch seat. A proximity baffle is installed on the rear end of the proximity rod. The proximity rod, proximity switch seat and proximity baffle are all located in the protective cover.

[0018] The principle is: change the traditional cutting method and adopt the rolling extrusion method. The rolling extrusion rotational power is driven by the rotating mechanism, and the radial feed power is driven by the feed mechanism. The total power is used by an electric motor or a pneumatic motor as the power source. The power is output to the gearbox and reduced in speed through the gear. The output gear is engaged with the large gear, and the large gear drives the output shaft, the output shaft drives the main shaft, and the main shaft drives the tool holder shaft to rotate, thereby realizing the rotation of the tool holder. The other end of the output shaft is equipped with a feed gear, which drives the feed shaft to rotate, drives the swing arm to drive the ratchet to rotate, and the ratchet drives the feed screw to rotate. The push rod is driven to move, and the inclined surface at the front end of the push rod cooperates with the inclined surface at the bottom end of the tool holder to achieve radial propulsion, allowing the tool to cut the pipe. The blade is located on the tool holder shaft, and the cross-section of the tool holder shaft is a beveled surface. The push rod inclined surface cooperates with the beveled surface to achieve radial guided movement. An operating handle is provided at the rear end of the mechanism to control the opening and closing nut to complete the feed and retract operations. A positioning sleeve is provided at the front end of the mechanism, which is sleeved on the tool holder shaft to ensure the positioning of the tool. The tool is a circular cutter that rolls along the pipe wall, extruding and cutting the inner wall of the pipe, and feeds at a constant speed until the metal pipe is cut. Throughout the entire process, the blade rolls and extrudes rather than cuts, so no chips are generated and there is no need to clean up the chips, saving time and effort, reducing tool wear and protecting the tool. The rolling extrusion has low vibration, can ensure positioning accuracy, and improve cutting efficiency. Moreover, through speed change, a reasonable feed rate is calculated, and the operating handle controls the automatic feed or automatic retract, cutting the pipe fitting from the inside of the pipe, and the cut surface is smooth.

[0019] The advantages of the present invention are:

[0020] The present invention has a reasonable structural design. The blade rolls and extrudes instead of cutting, so no cutting chips are generated and there is no need to clean the cutting chips, which saves time and effort. The tool wear is small and the tool is protected. The rolling and extruding method has small jitter, which can ensure positioning accuracy and improve cutting efficiency. Moreover, through speed change, a reasonable feed rate is calculated, and the operating handle controls the automatic feed or automatic retraction, so that the pipe fitting is cut from the inside of the pipe, and the cutting surface is smooth. Description of the drawings:

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 for Figure 1 AA section view in.

[0024] Figure 3 for Figure 1 A magnified view of the local structure at point B in the middle.

[0025] Figure 4 This is a side view of the knife holder.

[0026] Figure 5 This is the front view of the push rod.

[0027] Figure 6 for Figure 5 Cross-sectional view of AA in the figure. Specific implementation method:

[0029] See attached figure.

[0030] The cam 4 is provided with an axially extending screw thread of the tool holder 2, and the cam 4 is provided with an axially extending screw thread of the tool holder 2, and the cam 4 is provided with an axially extending screw thread of the tool holder 2, and the cam 4 is provided with an axially extending screw thread of the tool holder 2.

[0031] Furthermore, the blade 1 is a circular blade, which is installed on the tool holder 2 through a pin shaft 8. The front end of the tool holder shaft 3 is fitted with a positioning sleeve 9, and the front end of the tool holder shaft 3 is fixedly installed with a head screw 10. The threaded section at the rear of the tool holder shaft 3 that is screwed with the main shaft 4 is a step stage, and a rear auxiliary positioning sleeve 11 is fitted between the step transition and the main shaft.

[0032] Furthermore, the power output gear is the output gear of the gearbox, which is outputted by the motor or the power source through the gears in the reduction box 12 at a reduced speed step by step.

[0033] Furthermore, the feed screw mechanism includes a feed screw 13, which is coaxial with the push rod 7. The feed screw 13 includes a rod body, a protruding threaded section is provided on the rod body, and the rear end of the threaded section is screwed into the mounting hole in the middle of the rear cover 14. An opening and closing nut 15 screwed with the feed screw 13 is installed at the corresponding position of the threaded section. The opening and closing movement of the opening and closing nut 15 is driven by the turntable 16 behind it, and the rotation of the feed screw 13 is driven by the ratchet 16 at its front end.

[0034] Furthermore, the front end of the feed screw 13 is provided with a spline, which is installed with the ratchet 16 through a spline guide. The rotation of the ratchet 16 is driven by the feed pawl 17, and the feed pawl 17 is driven by the swing arm 18. The lower end of the swing arm 18 is rotatably installed on one side of the ratchet 16, and the bottom end of the swing arm 18 is provided with a feed pawl 17 that engages with the ratchet 16. A check ratchet 30 that slides on the tooth back of the ratchet 16 is installed in the inner wall of the middle shell where the ratchet 16 is located. The upper end of the swing arm 18 is installed at the end of the feed shaft 19. The feed shaft 19 is installed in the inner cavity of the upper end of the middle shell 20 through a bearing seat. The other end of the feed shaft 19 is provided with a feed gear 21. The rotation of the feed gear 21 is driven by the output shaft 5 below it. The rear end of the output shaft 5 is provided with a tooth segment that meshes with the feed gear 21 for transmission.

[0035] Furthermore, the opening and closing nut 15 includes an upper and lower half nut, which are located above and below the feed screw 13, and the inner sides of which are respectively provided with threads that screw into the feed screw 13. The upper and lower half nuts are respectively provided with guide grooves, which guide the movement up and down along the guide rails of the rear cover plate. The outer sides of the upper and lower half nuts are provided with drive pins 22, which pass through the holes on the rear cover plate 14 and are inserted into the two arc-shaped guide grooves on the turntable 16. The turntable is rotatably installed on the outer side of the rear cover plate 14, and an operating handle 31 is installed on the outer disk.

[0036] Furthermore, the push rod 7 passes through the center holes of the tool holder shaft 3, the main shaft 4, and the output shaft 5 in sequence, and a push block 23 is provided at its rear end. The inner hole of the output shaft where the rear end of the push rod 7 is located is a step hole. A return spring 24 is installed on the push rod 7 between the push block 23 and the step where the step hole is located. The push block 23 is in contact with the sliding bearing at the front end of the feed screw 13.

[0037] Furthermore, the guide groove at the bottom end of the tool holder 2 is a T-shaped groove, and the T-shaped groove is inclined from one side of the tool holder to the other side, and its inclination angle is matched with the propulsion guide inclined surface. The front end end of the push rod 7 is a T-shaped structure that cooperates with the T-shaped groove guide, and the upper end face of the T-shaped structure is the propulsion guide inclined surface.

[0038] Furthermore, the feed screw 13 is a hollow rod structure, and a nut 25 is screwed on its rear end. A proximity rod 26 coaxial with the feed screw is provided behind the nut 25. The front end of the proximity rod 26 is installed with a proximity switch 27 through a proximity switch seat, and the rear end of the proximity rod is installed with a proximity baffle 28. The proximity rod, proximity switch seat, and proximity baffle are all located in the protective cover 29.

[0039] In the description of the present invention, it should be noted that the terms "vertical," "upper," "lower," and "horizontal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections. They may also refer to mechanical connections or electrical connections. They may also refer to direct connections or connections through an intermediate medium. They may also refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A thick-walled metal pipe cutting machine, comprising a tool mechanism and a feed mechanism and a rotation mechanism for driving the tool mechanism, characterized in that: The tool mechanism includes a blade, which is fixedly mounted on the knife seat, and the knife seat is embedded in the mounting groove on the knife seat shaft. The rotation of the knife seat shaft is driven by the main shaft behind it, and the main shaft and the knife seat shaft are both hollow tube structures, and the matching ends of the main shaft and the knife seat shaft are fixedly connected by threads. The rotation of the main shaft is driven by a rotating mechanism, and the rotating mechanism includes a hollow output shaft, and a large gear meshing with the power output gear is installed on the output shaft. The feed of the knife seat is driven by the feeding mechanism, and the feeding mechanism includes a push rod located in the main shaft to drive the knife seat to feed, and the front end portion of the push rod is provided with a propulsion guide inclined surface, and the middle portion of the bottom end portion of the knife seat is provided with a guide groove for guiding the push rod guide inclined surface, and the push rod is driven by the feed screw mechanism behind it; The feed screw mechanism includes a feed screw, which is coaxial with the push rod and includes a rod body. The rod body is provided with a protruding threaded section, and the rear end of the threaded section is screwed into the mounting hole in the middle of the rear cover plate. An opening and closing nut screwed with the feed screw is installed at a position corresponding to the threaded section. The opening and closing movement of the opening and closing nut is driven by a rotary disk behind it, and the rotation of the feed screw is driven by a ratchet at its front end. The front end of the feed screw is provided with a spline, which is installed with the ratchet through a spline guide. The rotation of the ratchet is toggled by the feed pawl, and the feed pawl is driven by a swing arm. The lower end of the swing arm is rotatably installed on one side of the ratchet, and the bottom end of the swing arm is provided with a feed pawl meshing with the ratchet. A non-return ratchet that slides on the tooth back of the ratchet is installed in the inner wall of the middle shell where the ratchet is located. The upper end of the swing arm is installed at the end of the feed shaft, and the feed shaft is installed in the inner cavity of the upper end of the middle shell through a bearing seat. A feed gear is installed at the other end of the feed shaft, and the rotation of the feed gear is driven by the output shaft below it. The rear end of the output shaft is provided with a tooth segment meshing with the feed gear for transmission; The split nut includes an upper nut and a lower nut half, the upper nut and the lower nut half are located above and below the feed screw, and the inner sides of the upper nut and the lower nut half are respectively provided with threads that are screwed with the feed screw, and the upper nut and the lower nut half are respectively provided with guide grooves, which guide the movement up and down along the guide rails of the rear cover plate, and the outer sides of the upper nut and the lower nut half are provided with drive pins, which pass through the holes on the rear cover plate and are inserted into the two arc-shaped guide grooves on the turntable, and the turntable is rotatably mounted on the outer side of the rear cover plate, and an operating handle is installed on the outer disk; The push rod passes through the center holes of the tool holder shaft, the main shaft, and the output shaft in sequence, and a push block is provided at its rear end. The inner hole of the output shaft where the rear end of the push rod is located is a stepped hole. A return spring is sleeved on the push rod between the push block and the step where the stepped hole is located. The push block is in contact with the sliding bearing at the front end of the feed screw. The guide groove at the bottom end of the knife seat is a T-shaped groove, and the T-shaped groove is inclined from one side of the knife seat to the other side, and its inclination angle is matched with the guide of the propulsion guide inclined surface. The front end of the push rod is a T-shaped structure that cooperates with the T-shaped groove guide, and the upper end surface of the T-shaped structure is the propulsion guide inclined surface; The feed screw is a hollow rod structure with a nut screwed on its rear end. A proximity rod coaxial with the feed screw is provided behind the nut. A proximity switch is installed on the front end of the proximity rod through a proximity switch seat. A proximity baffle is installed on the rear end of the proximity rod. The proximity rod, proximity switch seat and proximity baffle are all located in the protective cover.

2. The thick-walled metal pipe cutting machine according to claim 1, characterized in that: The blade is a circular blade, which is installed on the tool holder through a pin shaft. The front end of the tool holder shaft is covered with a positioning sleeve, and the front end of the tool holder shaft is fixedly installed with a head screw. The threaded section at the rear of the tool holder shaft that is screwed with the main shaft is a step stage, and a rear auxiliary positioning sleeve is covered between the step transition and the main shaft.

3. The thick-walled metal pipe cutting machine according to claim 1, characterized in that: The power output gear is the output gear of the gearbox, which is outputted by the motor or the power source through the gears in the reduction box at a reduced speed step by step.

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