Portable pipeline beveling machine

Abstract

The invention provides a portable pipeline beveling machine which comprises a machine shell assembly, a driving shaft, a rotary driving assembly, a driving gear, a clutch, a sliding gear installed on the driving shaft in a sliding mode and sliding in the axial direction of the driving shaft, and a shifting rod assembly used for driving the sliding gear to move to be connected with the clutch or separated from the clutch. The cutter feeding gear is rotationally connected with the machine shell assembly, the gear sleeve is rotationally connected with the machine shell assembly and meshed with the driving gear, the cutter feeding shaft is movably installed in the gear sleeve, can rotate around the axial direction of the cutter feeding gear and can slide in the axial direction of the cutter feeding gear, the cutter head is installed on the cutter feeding shaft, and the cutter feeding shaft is in key connection with the gear sleeve. The feed gear is meshed with the sliding gear and is in threaded connection with the feed shaft, the transmission ratio of the driving gear to the gear sleeve is larger than that of the sliding gear to the feed gear, and the output end of the rotary driving assembly rotates anticlockwise. The beveling device can improve the beveling quality and improve the beveling efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline beveling, in particular to a portable pipeline beveling machine. Background Art

[0002] A beveling machine is a special tool for chamfering the front face of a pipe before welding. It solves the shortcomings of flame cutting and grinding with a grinder, such as irregular angles, rough bevels, and loud operating noise. It has the advantages of easy operation, standard angles, and smooth surfaces. Currently, pipes of different diameters are often processed, welded, and repaired during pipeline installation and on-site maintenance in industries such as electricity, petroleum, chemical industry, and construction.

[0003] The pipe beveling machine used in the prior art adopts manual feed when beveling, which is labor-intensive and technically difficult to operate. It is very easy to cause misoperation and damage the tool or the beveling machine, resulting in poor beveling quality and low work efficiency. Summary of the Invention

[0004] The object of the present invention is to provide a portable pipe beveling machine to solve the problems of poor beveling quality and low working efficiency of existing portable pipe beveling machines.

[0005] To solve the above technical problems, the present invention provides a portable pipe beveling machine, comprising a housing assembly, a drive shaft rotatably connected to the housing assembly, a rotary drive assembly for driving the drive shaft to rotate, a drive gear fixedly mounted on the drive shaft, a clutch mounted on the drive shaft, a sliding gear slidably mounted on the drive shaft and sliding along the axial direction of the drive shaft, a lever assembly for driving the sliding gear to engage with or disengage from the clutch, a feed gear rotatably connected to the housing assembly, a gear sleeve rotatably connected to the housing assembly and meshing with the drive gear, a feed shaft movably mounted in the gear sleeve and capable of rotating around the axial direction of the feed gear and sliding along the axial direction of the feed gear, and a cutter disc mounted on the feed shaft, the feed shaft being keyed to the gear sleeve, the feed gear meshing with the sliding gear, the feed gear being threadedly connected to the feed shaft, a transmission ratio between the drive gear and the gear sleeve being greater than a transmission ratio between the sliding gear and the feed gear, and the output end of the rotary drive assembly rotates counterclockwise.

[0006] Optionally, it further includes a first friction disc and a second friction disc installed on the drive shaft, and a friction elastic member installed on the housing assembly for pressing the first friction disc against the second friction disc along the axial direction of the drive shaft. The second friction disc is fixedly mounted on the sliding gear. When the shift rod assembly separates the sliding gear from the clutch, the sliding gear and the friction elastic member press the first friction disc and the second friction disc together.

[0007] Optionally, the clutch includes a clutch body mounted on the drive shaft and capable of sliding axially relative to the drive shaft along the drive shaft, and a clutch elastic member for limiting the axial sliding of the clutch body relative to the drive shaft along the drive shaft. The clutch body is key-connected to the drive shaft, and a limit block is fixed on the feed shaft for separating the clutch from the sliding gear when the feed shaft moves to the feed limit position.

[0008] Optionally, a limiting protrusion that cooperates with the limiting block is provided on a side of the feed gear facing the gear sleeve.

[0009] Optionally, the casing assembly includes a casing, a first positioning plate, a second positioning plate, a gear box and an upper cover, the first positioning plate and the second positioning plate are installed on the casing, the gear box is installed on the first positioning plate and the second positioning plate, and the upper cover covers the gear box.

[0010] Optionally, it also includes a first ball bearing and a second ball bearing, one end of the drive shaft is mounted on the casing through the first ball bearing, and the other end is mounted on the upper cover through the second ball bearing, the outer ring of the first ball bearing is axially limited by the casing, the inner ring of the first ball bearing is axially limited by the gear washer, the outer ring of the second ball bearing is limited by the upper cover, and the inner ring of the second ball bearing is limited by the shoulder of the drive shaft.

[0011] Optionally, the rotary drive assembly includes a motor, a driving bevel gear and a driven bevel gear, the motor is mounted on the casing, the driving bevel gear is rotatably mounted on the casing, the driving bevel gear is mounted on the output shaft of the motor, and the driven bevel gear is mounted on the drive shaft.

[0012] Optionally, it also includes a first bevel gear bearing, a second bevel gear bearing and an elastic retaining ring for the first shaft, and the casing assembly also includes a motor mounting seat installed on the casing. The active bevel gear is rotatably mounted on the casing through the first bevel gear bearing and the second bevel gear bearing. The inner rings of the first bevel gear bearing and the second bevel gear bearing are respectively limited by the elastic retaining ring for the first shaft and the shoulder of the active bevel gear, and the outer rings of the first bevel gear bearing and the second bevel gear bearing are respectively limited by the casing and the motor mounting seat.

[0013] Optionally, a second shaft elastic retaining ring is further included, one end of the clutch body is pressed against the end face of the driving gear through a clutch spring, and the other end is limited by the second shaft elastic retaining ring.

[0014] Optionally, the shift rod assembly includes a shift rod shaft seat, a shift rod shaft, a shift rod and a shift rod bearing, the shift rod shaft seat is mounted on the first positioning plate, the shift rod shaft is rotatably mounted on the shift rod shaft seat, the shift rod is mounted on the shift rod shaft, the shift rod shaft includes a main body shaft section and an eccentric shaft section connected to the main body shaft section, and the eccentric shaft section is rotatably mounted on the sliding gear through the shift rod bearing.

[0015] The portable pipe beveling machine provided by the present invention has the following beneficial effects: When the clutch and the sliding gear are engaged, since the rotary drive assembly is used to drive the drive shaft to rotate, the drive shaft can drive the clutch and the drive gear to rotate synchronously, thereby dividing the power into two transmission paths through the clutch and the drive gear, one path is transmitted to the gear sleeve through the drive gear, and then to the feed shaft through the gear sleeve, and the other path is transmitted to the sliding gear through the clutch, and then to the feed gear through the sliding gear. Since the transmission ratio of the drive gear and the gear sleeve is greater than the transmission ratio of the sliding gear and the feed gear, the speed of the feed shaft is less than the speed of the feed gear, and the output end of the rotary drive assembly rotates counterclockwise, so the feed shaft can be moved away from the feed gear. In this way, automatic feeding can be achieved, thereby improving feeding efficiency and improving groove quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 2. It is a cross-sectional view of the portable pipe beveling machine according to the embodiment of the present invention when the tool is retracted to the limit position; Figure 2 is a cross-sectional view of the portable pipe beveling machine during the cutting process according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the portable pipe beveling machine according to an embodiment of the present invention when the cutting tool reaches the limit position; Figure 4 This is a front view of the lever assembly of the portable pipe beveling machine in the embodiment of the present invention during the cutting process; Figure 5 is a cross-sectional view of the lever assembly of the portable pipe beveling machine according to an embodiment of the present invention during the feeding process; Figure 6 This is a front view of the lever assembly of the portable pipe beveling machine in the embodiment of the present invention when the tool is retracted; Figure 7 It is a cross-sectional view of the lever assembly of the portable pipe beveling machine in the embodiment of the present invention when the tool is retracted.

[0017] Description of reference numerals: 1- housing; 17- first positioning plate; 36- second positioning plate; 32- gear box; 29- upper cover; 13- motor mounting base; 45-drive shaft; 11-driving bevel gear; 9-driven bevel gear; 12- driving gear; 16-clutch body; 15-clutch elastic member; 23-sliding gear; 33-feed gear; 38-gear sleeve; 44-feed shaft; 43- knife disc; 35-limiting block; 25-first friction disc; 24-second friction disc; 28-friction elastic member; 7-first ball bearing; 27-second ball bearing; 8-gear washer; 10-1-first bevel gear bearing; 10-2-second bevel gear bearing; 14-elastic retaining ring for the first shaft; 19- Elastic retaining ring for the second shaft; 40-first gear sleeve bearing; 37-second gear sleeve bearing; 41-sealing cover; 34- Circlip for the third shaft; 31-feed gear bearing; 30-elastic retaining ring for the fourth axis; 18-shift lever shaft seat; 20-shift lever shaft; 22-shift lever; 21-shift lever bearing; 2-Fixed clamping head; 3-Movable clamping head; 5-Clamping screw; 6-Force rod. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0021] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0023] 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 refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0024] refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , Figure 1 This is a cross-sectional view of the portable pipe beveling machine in the embodiment of the present invention when the tool is retracted to the limit position. Figure 2 1 is a cross-sectional view of the portable pipe beveling machine during the cutting process according to an embodiment of the present invention. Figure 3 This is a cross-sectional view of the portable pipe beveling machine according to the embodiment of the present invention when the cutting tool reaches the limit position. Figure 4 This is a front view of the lever assembly of the portable pipe beveling machine in the embodiment of the present invention when the cutting is in progress. Figure 5 1 is a cross-sectional view of the lever assembly of the portable pipe beveling machine according to an embodiment of the present invention during the cutting process. Figure 6This is a front view of the lever assembly of the portable pipe beveling machine in the embodiment of the present invention when the tool is retracted. Figure 7 2 is a cross-sectional view of a lever assembly of a portable pipe beveling machine in an embodiment of the present invention when the tool is retracted. This embodiment provides a portable pipe beveling machine, comprising a housing assembly, a drive shaft 45 rotatably connected to the housing assembly, a rotary drive assembly for driving the drive shaft 45 to rotate, a drive gear 12 fixedly mounted on the drive shaft 45, a clutch mounted on the drive shaft 45, a sliding gear 23 slidably mounted on the drive shaft 45 and slidable along the axial direction of the drive shaft 45, a lever assembly for driving the sliding gear 23 to move to engage with or disengage from the clutch, and a feed gear 33 rotatably connected to the housing assembly. A gear sleeve 38 is rotatably connected to the housing assembly and meshed with the drive gear 12, a feed shaft 44 is movably installed in the gear sleeve 38 and can rotate around the axial direction of the feed gear 33 and can slide along the axial direction of the feed gear 33, and a cutter disc 43 is installed on the feed shaft 44, the feed shaft 44 is keyed to the gear sleeve 38, the feed gear 33 is meshed with the sliding gear 23, and the feed gear 33 is threadedly connected to the feed shaft 44, the transmission ratio of the drive gear 12 and the gear sleeve 38 is greater than the transmission ratio of the sliding gear 23 and the feed gear 33, and the output end of the rotary drive assembly rotates counterclockwise.

[0025] When the clutch and the sliding gear 23 are engaged, since the rotary drive assembly is used to drive the drive shaft 45 to rotate, the drive shaft 45 can drive the clutch and the drive gear 12 to rotate synchronously, thereby dividing the power into two transmission paths through the clutch and the drive gear 12, one path is transmitted to the gear sleeve 38 through the drive gear 12, and then to the feed shaft 44 through the gear sleeve 38, and the other path is transmitted to the sliding gear 23 through the clutch, and then to the feed gear 33 through the sliding gear 23. Since the transmission ratio of the drive gear 12 and the gear sleeve 38 is greater than the transmission ratio of the sliding gear 23 and the feed gear 33, the rotation speed of the feed shaft 44 is less than the rotation speed of the feed gear 33, and the output end of the rotary drive assembly rotates counterclockwise, so that the feed shaft 44 can be moved away from the feed gear 33. In this way, automatic feeding can be achieved, thereby improving feeding efficiency and improving groove quality.

[0026] Furthermore, the clutch includes a clutch body 16 mounted on the drive shaft 45 and capable of axially sliding relative to the drive shaft 45 along the drive shaft 45, and a clutch elastic member 15 for limiting the axial sliding of the clutch body 16 relative to the drive shaft 45 along the drive shaft 45. The clutch body 16 is keyed to the drive shaft 45. A stop block 35 is fixed to the feed shaft 44 for disengaging the clutch from the sliding gear 23 when the feed shaft 44 moves to the feed limit position. Thus, when the feed shaft 44 moves to the feed limit position, the stop block 35 disengages the clutch from the sliding gear 23, preventing the feed gear 33 from rotating relative to the feed shaft 44, thereby stopping the feed and preventing the cutter head 43 from damaging the fuselage fixture. Specifically, when the feed reaches the limit position, the stop block 35 moves the clutch body 16 toward the drive gear 12, thereby disengaging the clutch body 16 from the sliding gear 23.

[0027] The portable pipe beveling machine also includes a first friction disc 25 and a second friction disc 24 mounted on the drive shaft 45, and a friction elastic member 28 mounted on the housing assembly for pressing the first friction disc 25 against the second friction disc 24 along the axial direction of the drive shaft 45. The second friction disc 24 is fixedly mounted on the sliding gear 23. When the shift lever assembly separates the sliding gear 23 from the clutch, the sliding gear 23 and the friction elastic member 28 press the first friction disc 25 and the second friction disc 24 together. That is to say, when the lever assembly separates the sliding gear 23 from the clutch, the sliding gear 23 hardly rotates under the action of the first friction plate 25 and the second friction plate 24, and the rotary drive assembly can drive the drive shaft 45 to rotate, thereby driving the gear 12 sleeve to rotate through the drive gear 12, and then driving the feed shaft 44 to rotate through the gear sleeve 38, that is, the feed shaft 44 rotates, and the feed gear 33 hardly rotates. Therefore, the feed shaft 44 can be moved in the direction close to the feed gear 33, so that automatic retraction can be achieved, thereby improving the retraction efficiency and improving the groove quality.

[0028] Furthermore, when the feed shaft 44 retracts until the feed gear 33 contacts the stop block 35, the engagement between the feed gear 33 and the stop block 35 is tighter than the engagement between the first friction disc 25 and the second friction disc 24. Therefore, the feed gear 33 and the feed shaft 44 rotate synchronously, the feed gear 33 drives the sliding gear 23 to rotate, and the sliding gear 23 drives the second friction disc 24 to rotate, thereby stopping the retraction and protecting the feed shaft 44 from colliding with the housing 1. Specifically, during retraction, the contact pressure exerted by the stop block between the feed gear 33 and the stop block 35 causes the first friction disc 25 to rotate relative to the second friction disc 24, and causes the feed gear 33 and the stop block 35 to rotate synchronously, thereby stopping the retraction.

[0029] Preferably, a limiting protrusion that cooperates with the limiting block 35 is provided on a surface of the feed gear 33 facing the gear sleeve 38 .

[0030] The casing assembly includes a casing 1, a first positioning plate 17, a second positioning plate 36, a gear box 32 and an upper cover 29. The first positioning plate 17 and the second positioning plate 36 are installed on the casing 1, the gear box 32 is installed on the first positioning plate 17 and the second positioning plate 36, and the upper cover 29 covers the gear box 32.

[0031] The portable pipe beveling machine also includes a first ball bearing 7, a second ball bearing 27 and a gear washer 8. One end of the drive shaft 45 is mounted on the housing 1 through the first ball bearing 7, and the other end is mounted on the upper cover 29 through the second ball bearing 27. The outer ring of the first ball bearing 7 is axially limited by the housing 1, and the inner ring of the first ball bearing 7 is axially limited by the gear washer 8. The outer ring of the second ball bearing 27 is limited by the upper cover 29, and the inner ring of the second ball bearing 27 is limited by the shoulder of the drive shaft 45.

[0032] In this embodiment, the rotary drive assembly includes a motor, a driving bevel gear 11, and a driven bevel gear 9. The motor is mounted on the housing 1, the driving bevel gear 11 is rotatably mounted on the housing 1, the driving bevel gear 11 is mounted on the output shaft of the motor, and the driven bevel gear 9 is mounted on the drive shaft 45. The motor drives the driving bevel gear 11 to rotate, thereby driving the driven bevel gear 9 to rotate, and then driving the drive shaft 45 to rotate.

[0033] The portable pipe beveling machine also includes a first bevel gear bearing 10-1, a second bevel gear bearing 10-2 and a first shaft elastic retaining ring 14. The casing assembly also includes a motor mounting base 13 mounted on the casing 1. The active bevel gear 11 is rotatably mounted on the casing 1 through the first bevel gear bearing 10-1 and the second bevel gear bearing 10-2. The inner rings of the first bevel gear bearing 10-1 and the second bevel gear bearing 10-2 are respectively limited by the first shaft elastic retaining ring 14 and the shaft shoulder of the active bevel gear 11, and the outer rings of the first bevel gear bearing 10-1 and the second bevel gear bearing 10-2 are respectively limited by the casing 1 and the motor mounting base 13.

[0034] The driving gear 12 is integrally provided with the driving shaft 45 .

[0035] The portable pipe beveling machine further includes a second shaft circlip 19 . One end of the clutch body 16 abuts against the end face of the driving gear 12 via the clutch elastic member 15 , and the other end is limited by the second shaft circlip 19 .

[0036] The portable pipe beveling machine also includes a first gear sleeve bearing 40, a second gear sleeve bearing 37 and a sealing cover 41. One end of the gear sleeve 38 is mounted on the housing 1 through the first gear sleeve bearing 40, and the other end is mounted on the second positioning plate 36 through the second gear sleeve bearing 37. The inner ring of the first gear sleeve bearing 40 is limited by the shaft shoulder of the gear sleeve 38, and the outer ring of the first gear sleeve bearing 40 is limited by the sealing cover 41. The outer ring of the second gear sleeve bearing 37 is limited by the second positioning plate 36, and the inner ring of the second gear sleeve bearing 37 is limited by the shaft shoulder on the gear sleeve 38.

[0037] The portable pipe beveling machine further includes a third shaft elastic circlip 34 , and the limiting block 35 is limited by the shaft shoulder of the feed shaft 44 and the third shaft elastic circlip 34 .

[0038] The portable pipe beveling machine also includes a feed gear bearing 31 and a fourth shaft elastic retaining ring 30. The feed gear 33 is installed in the gear box 32 through the feed gear bearing 31, and the outer ring of the feed gear bearing 31 is supported by the gear box 32, and the inner ring is supported by the upper cover 29. The feed gear 33 is hung on the inner ring of the feed gear bearing 31 through the fourth shaft elastic retaining ring 30.

[0039] The shift lever assembly includes a shift lever shaft seat 18, a shift lever shaft 20, a shift lever 22, and a shift lever bearing 21. The shift lever shaft seat 18 is mounted on the first positioning plate 17. The shift lever shaft 20 is rotatably mounted on the shift lever shaft seat 18. The shift lever 22 is mounted on the shift lever shaft 20. The shift lever shaft 20 includes a main shaft section and an eccentric shaft section connected to the main shaft section. The eccentric shaft section is rotatably mounted on the sliding gear 23 via the shift lever bearing 21. In this way, the eccentric shaft section can be rotated by shifting the shift lever 22. When the rotation causes the sliding gear 23 to engage with the clutch, the tool can be fed. Figure 4 and Figure 5 When the sliding gear 23 is rotated to separate from the clutch and the friction between the first friction plate 25 and the second friction plate 24 increases, the tool can be retracted, reference Figure 6 and Figure 7 .

[0040] The portable pipe beveling machine further comprises a clamping assembly for clamping the pipe.

[0041] Specifically, the clamping assembly includes a fixed clamping head 2 mounted on the housing 1, a movable clamping head 3 slidably connected to the housing 1, and a clamping drive rod that drives the movable clamping head 3 to slide in a direction close to and away from the fixed clamping head 2.

[0042] The clamping drive rod includes a clamping screw 5 and a force rod 6 . The clamping screw 5 is threadedly connected to the housing 1 and one end is connected to the movable clamping head 3 . The force rod 6 is connected to the other end of the clamping screw 5 .

[0043] In this embodiment, the working process of the portable pipe beveling machine during cutting is as follows: The lever 22 is moved until the sliding gear 23 engages with the clutch. The motor drives the active bevel gear 11 to rotate, which in turn drives the driven bevel gear 9 to rotate. The driven bevel gear 9 drives the drive shaft 45 to rotate, which in turn drives the clutch and the drive gear 12 to rotate. The drive gear 12 drives the gear 12 sleeve to rotate, and the gear sleeve 38 drives the feed shaft 44 to rotate. The clutch drives the sliding gear 23 to rotate, which in turn drives the feed gear 33 to rotate. The feed shaft 44 moves relative to the feed gear 33 and moves away from the feed gear 33, thereby achieving feed. When the feed shaft 44 moves until the limit block 35 abuts the clutch and the clutch and sliding gear 23 are disengaged, the feed shaft 44 drives the feed gear 33 to rotate, which in turn drives the sliding gear 23 to rotate, thereby stopping feed.

[0044] In this embodiment, the working process of the portable pipe beveling machine when retracting the cutter is as follows: The lever 22 is moved until the sliding gear 23 is disengaged from the clutch, and the sliding gear 23 and the friction elastic member 28 compress the first friction disc 25 and the second friction disc 24, thereby slowing the rotation speed of the sliding gear 23 to a minimum or almost zero. The motor then drives the driving bevel gear 11 to rotate, which in turn drives the driven bevel gear 9 to rotate, which in turn drives the drive shaft 45 to rotate. The drive shaft 45 then drives the clutch and the drive gear 12 to rotate, which in turn drives the gear 12 sleeve to rotate, which in turn drives the feed shaft 44 to rotate. The feed shaft 44 then moves relative to the feed gear 33 and toward the feed gear 33, thereby retracting the cutter. When the feed shaft 44 retracts until the feed gear 33 contacts the stop block 35, the friction between the feed gear 33 and the stop block 35 is greater than the friction between the first friction disc 25 and the second friction disc 24. Consequently, the feed gear 33 and the feed shaft 44 rotate synchronously, thereby stopping the retraction.

[0045] In this embodiment, the feed rate is 6.12 mm per minute and the feed rate per revolution is 0.028 mm.

[0046] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A portable pipe beveling machine, comprising a housing assembly, characterized in that: The transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the sliding gear, and the transmission gear is engaged with the feeding shaft.

2. The portable pipe beveling machine according to claim 1, characterized in that: It also includes a first friction disc and a second friction disc installed on the drive shaft, and a friction elastic member installed on the housing assembly for pressing the first friction disc against the second friction disc along the axial direction of the drive shaft. The second friction disc is fixedly mounted on the sliding gear. When the shift rod assembly separates the sliding gear from the clutch, the sliding gear and the friction elastic member press the first friction disc and the second friction disc together.

3. The portable pipe beveling machine according to claim 1, characterized in that: The clutch includes a clutch body mounted on the drive shaft and capable of sliding axially relative to the drive shaft along the drive shaft, and a clutch elastic member for limiting the axial sliding of the clutch body relative to the drive shaft along the drive shaft. The clutch body is key-connected to the drive shaft, and a limit block is fixed on the feed shaft for separating the clutch from the sliding gear when the feed shaft moves to the feed limit position.

4. The portable pipe beveling machine according to claim 3, characterized in that: A limiting protrusion that cooperates with the limiting block is provided on a side of the feed gear facing the gear sleeve.

5. The portable pipe beveling machine according to claim 3, characterized in that: The housing assembly includes a housing, a first positioning plate, a second positioning plate, a gear box and an upper cover. The first positioning plate and the second positioning plate are installed on the housing, the gear box is installed on the first positioning plate and the second positioning plate, and the upper cover is covered on the gear box.

6. The portable pipe beveling machine according to claim 5, characterized in that: It also includes a first ball bearing and a second ball bearing. One end of the drive shaft is mounted on the casing through the first ball bearing, and the other end is mounted on the upper cover through the second ball bearing. The outer ring of the first ball bearing is axially limited by the casing, and the inner ring of the first ball bearing is axially limited by the gear washer. The outer ring of the second ball bearing is limited by the upper cover, and the inner ring of the second ball bearing is limited by the shoulder of the drive shaft.

7. The portable pipe beveling machine according to claim 5, characterized in that: The rotary drive assembly includes a motor, a driving bevel gear and a driven bevel gear. The motor is mounted on the housing. The driving bevel gear is rotatably mounted on the housing. The driving bevel gear is mounted on the output shaft of the motor. The driven bevel gear is mounted on the drive shaft.

8. The portable pipe beveling machine according to claim 5, characterized in that: It also includes a first bevel gear bearing, a second bevel gear bearing and a first shaft elastic retaining ring. The housing assembly also includes a motor mounting seat mounted on the housing. The active bevel gear is rotatably mounted on the housing through the first bevel gear bearing and the second bevel gear bearing. The inner rings of the first bevel gear bearing and the second bevel gear bearing are respectively limited by the first shaft elastic retaining ring and the shaft shoulder of the active bevel gear, and the outer rings of the first bevel gear bearing and the second bevel gear bearing are respectively limited by the housing and the motor mounting seat.

9. The portable pipe beveling machine according to claim 5, characterized in that: It also includes a second shaft elastic retaining ring. One end of the clutch body is pressed against the end surface of the driving gear through a clutch spring, and the other end is limited by the second shaft elastic retaining ring.

10. The portable pipe beveling machine according to claim 5, characterized in that: The shift rod assembly includes a shift rod shaft seat, a shift rod shaft, a shift rod and a shift rod bearing. The shift rod shaft seat is installed on the first positioning plate. The shift rod shaft is rotatably installed on the shift rod shaft seat. The shift rod is installed on the shift rod shaft. The shift rod shaft includes a main shaft section and an eccentric shaft section connected to the main shaft section. The eccentric shaft section is rotatably installed on the sliding gear through the shift rod bearing.

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