Hand-held automatic pipe cutting machine

Abstract

The application relates to a handheld automatic pipe cutting machine, belonging to the technical field of straight pipe cutting, which is characterized in that a driving assembly is arranged to drive a cutter holder to drive a cutting knife to rotate in an inner cam ring, and meanwhile, the driving assembly drives a cutter rod to drive the cutting knife to switch between a first position far away from the center of the inner cam ring and a second position close to the center of the inner cam ring, so that the cutting of the pipe and the retreat of the cutting knife are realized, automatic cutting is realized, and in addition, at least one of the cutter rods is an eccentric shaft rod, the cutting knife is arranged in the same plane, the cutting opening of the pipe is smooth, subsequent rework is reduced, and the machining efficiency is improved.

Description

Technical Field

[0001] This invention relates to a handheld automatic pipe cutting machine, belonging to the field of straight pipe cutting technology. Background Technology

[0002] Traditional automatic steel pipe cutting machines are inconvenient to operate, requiring manual control of the rotating cutting wheel to cut the steel pipe. The cutting process generates debris, which can easily damage the surface of the steel pipe. Moreover, most current automatic cutting machines are heavy and bulky, making them inconvenient to carry. They also have low cutting precision, and when cutting small-diameter steel pipes, burrs are prone to appear at the cut. Furthermore, the cutting process may generate heat, causing metal deformation or increased internal stress, which affects subsequent processes and the appearance of the product. Summary of the Invention

[0003] The purpose of this invention is to provide a handheld automatic pipe cutting machine to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a handheld automatic pipe cutting machine, the handheld automatic pipe cutting machine comprising:

[0005] A housing having a cavity formed therein and inlets and outlets symmetrically formed on both sides of the housing communicating with the cavity; a pipe enters from the inlet and extends out from the outlet;

[0006] A cutting mechanism is disposed within the accommodating cavity. The cutting mechanism includes an inner cam ring coaxially disposed with the inlet, at least one pair of cutting assemblies circumferentially spaced within the inner cam ring, and a drive assembly for rotating the cutting assemblies within the inner cam ring. The cutting assembly includes a blade rod radially abutting against the inner wall of the inner cam ring, a cutting blade connected to the blade rod, and a blade holder slidably connected to the blade rod. At least one of the blade rods is an eccentric shaft to arrange the cutting blade in the same plane.

[0007] The drive assembly is connected to the cutter holder. Under the drive of the drive assembly, the cutter has a first position away from the center of the inner cam ring and a second position close to the center of the inner cam ring. The cutter is located in the first position away from the tube passing through the inner cam ring. The cutter is located in the second position with part of the cutter extending into the inside of the tube.

[0008] Furthermore, the inner cam ring has a plurality of circular tracks arranged radially in a one-to-one configuration with the cutting assembly, the centers of the plurality of circular tracks do not coincide, and the end of the cutter bar abuts against the inner wall of the circular tracks.

[0009] Furthermore, a roller is provided at the end of the tool holder that abuts against the circular track.

[0010] Furthermore, the drive assembly includes a drive member and a transmission bevel gear meshing with the output shaft of the drive member. The center of the transmission bevel gear is provided with a through hole that is collinear with the inlet axis for the pipe to pass through. The tool holder is fixedly connected to the back of the transmission bevel gear.

[0011] Furthermore, the tool holder includes a fixed base and a linear bearing disposed within the fixed base, the linear bearing being sleeved on the tool holder.

[0012] Furthermore, the handheld automatic pipe cutting machine also includes a pipe locking assembly disposed at the inlet. The pipe locking assembly includes a screwing part located outside the housing and a locking part disposed inside the housing. The locking part is configured to clamp or release the pipe under the drive of the screwing part.

[0013] Furthermore, an engaging connection structure is formed between the screwing part and the locking part, and the screwing part drives the locking part to clamp or loosen the pipe fitting through the engaging connection structure.

[0014] Furthermore, the locking part includes a fixing sleeve sleeved on the outside of the pipe fitting and a plurality of clamping teeth arranged obliquely through the fixing sleeve at intervals along the circumference of the fixing sleeve. A frustum-shaped cavity is formed inside the fixing sleeve. One end of the clamping teeth located outside the fixing sleeve is threadedly connected to the screwing part. The outer wall of the end of the clamping teeth located inside the fixing sleeve is adapted to the shape of the frustum-shaped cavity and the inner wall is in contact with the outer wall of the pipe fitting.

[0015] Furthermore, a support member is provided between the pipe locking assembly and the cutting assembly. The support member includes a support base fixedly connected to the housing and a bearing disposed within the support base. The axis of the bearing is collinear with the axis of the inlet.

[0016] Furthermore, the housing is provided with a handle, and the handle is provided with a switch assembly for controlling the drive assembly to be turned on or off.

[0017] The beneficial effects of this invention are as follows: This application sets up a drive assembly to drive the cutter holder to rotate the cutting blade inside the inner cam ring, while simultaneously driving the cutter bar to switch the cutting blade between a first position far from the center of the inner cam ring and a second position close to the center of the inner cam ring, thereby achieving the cutting of the pipe fitting and the retraction of the cutting blade, thus realizing automated cutting. In addition, by using at least one of the cutter bars as an eccentric shaft to arrange the cutting blade in the same plane, the cut of the pipe fitting is flat and smooth, reducing subsequent rework and improving processing efficiency.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a handheld automatic pipe cutting machine according to an embodiment of this application;

[0020] Figure 2 for Figure 1 Schematic diagram of the cutting mechanism;

[0021] Figure 3 for Figure 1 Exploded view of the locking assembly of the pipe fittings in the middle cutting mechanism. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Please refer to Figures 1 to 3 The handheld automatic pipe cutting machine shown in one embodiment of this application includes a housing 10 and a cutting mechanism 20 disposed within the housing 10.

[0026] The housing 10 has a cavity, and inlets and outlets that communicate with the cavity are symmetrically formed on both sides of the housing 10. The pipe enters from the inlet and extends from the outlet.

[0027] The cutting mechanism 20 is disposed within the accommodating cavity. The cutting mechanism 20 includes an inner cam ring 24 coaxially arranged with the inlet, at least one pair of cutting components spaced circumferentially within the inner cam ring 24, and a drive component for rotating the cutting components within the inner cam ring 24. Each cutting component includes a blade shank 27 radially abutting against the inner wall of the inner cam ring 24, a cutting blade 26 connected to the blade shank 27, and a blade holder 25 slidably connected to the blade shank 27. At least one of the blade shanks 27 is an eccentric shaft to arrange the cutting blade 26 in the same plane. In this embodiment, the cutting blade 26 is a circular blade, and the cutting blade 26 is hinged to the blade shank 27 so that during the cutting process, the cutting blade 26 can gradually cut into the pipe by slowly rotating on its own, avoiding the cutting blade 26 always cutting the pipe at a single point and preventing the cutting blade 26 from breaking.

[0028] The drive assembly is connected to the blade holder 25. Driven by the drive component 21, the cutting blade 26 has a first position away from the center of the inner cam ring 24 and a second position close to the center of the inner cam ring 24. In the first position, the cutting blade 26 is away from the pipe fitting that passes through the inner cam ring 24. In the second position, the cutting blade 26 partially extends into the pipe fitting. The drive assembly drives the cutting blade 26 to revolve and simultaneously drives it to move radially along the inner cam ring 24 for cutting or retraction. This avoids the heat generated by the high-speed rotation of the cutting blade 26 and friction with the pipe fitting, which could cause deformation of the pipe fitting or increase in internal stress. At the same time, the cutting process does not produce debris and does not damage the inner or outer surfaces of the steel pipe. It is easy to operate and can achieve automatic cutting without the need for manual control of the cutting amount.

[0029] In one embodiment, a plurality of circular tracks 241 are formed radially within the inner cam ring 24, arranged one-to-one with the cutting components. The centers of the circular tracks 241 do not coincide, and the end of the cutter bar 27 abuts against the inner wall of the circular track 241. Each circular track 241 includes a starting position where the cutting blade 26 is in a first position, a transition segment from the first position to a second position, and a cutting segment that is always in the second position. A pair of cutting components and circular tracks 241 are provided, symmetrically arranged within the inner cam ring 24. The centers of the pair of circular tracks 241 do not coincide, and the projection of the cutting segment of one cutting blade 26 exactly covers the starting position and transition segment of the other cutting blade 26 along the axial direction of the inner cam ring 24. This allows for the synchronous advance and retraction of the pair of cutting blades 26, enabling complete cutting of the pipe and preventing incomplete cutting at the starting position and transition segment. Admittedly, in other embodiments, more sets of cutting components can be provided, as long as the above functions are achieved; no specific limitation is made here.

[0030] In one embodiment, a roller 28 is provided at the end of the cutter bar 27 that abuts against the circular track 241. By providing the roller 28 at the end of the cutter bar 27, the sliding friction between the cutter bar 27 and the circular track 241 during its revolution is transformed into rolling friction, which can effectively reduce the friction between the two and thus reduce the load pressure on the drive component.

[0031] In one embodiment, the drive assembly includes a drive member 21 and a transmission bevel gear 23 meshing with the output shaft of the drive member 21. The center of the transmission bevel gear 23 is provided with a through hole colinear with the inlet axis for the pipe to pass through. The cutter holder 25 is fixedly connected to the back of the transmission bevel gear 23. The drive member 21 is a motor, and the output shaft of the motor is provided with a drive bevel gear 22. The motor drives the drive bevel gear 22 to drive the transmission bevel gear 23 to drive the cutter holder 25 to rotate, thereby driving the cutting blade 26 to rotate. At the same time, the cutting blade 26 moves between a first position and a second position, and continues to rotate while maintaining the second position until the positions of the pair of cutting blades 26 are interchanged after one revolution, thereby completing the cutting of the pipe.

[0032] In one embodiment, the tool holder 25 includes a fixed base and a linear bearing disposed within the fixed base, the linear bearing being sleeved on the tool shank 27. By providing a sliding connection between the linear bearing and the tool shank 27, the frictional force during relative sliding between the tool holder 25 and the tool shank 27 is reduced, effectively reducing the load on the motor.

[0033] In one embodiment, the handheld automatic pipe cutter further includes a pipe locking assembly 30 disposed at the inlet. The pipe locking assembly 30 includes a screwing part 31 located outside the housing 10 and a locking part disposed inside the housing 10. The locking part is configured to clamp or release the pipe under the drive of the screwing part 31. By providing the pipe locking assembly 30, the pipe is locked during cutting, preventing relative sliding between the pipe and the cutting blade 26 during the cutting process, which could lead to incomplete cutting of the pipe and affect subsequent processing.

[0034] In one embodiment, a meshing connection structure is formed between the screwing part 31 and the locking part, and the screwing part 31 drives the locking part to clamp or loosen the pipe fitting through the meshing connection structure. The locking part includes a fixing sleeve 33 sleeved on the outside of the pipe fitting and a plurality of clamping teeth 32 arranged obliquely through the fixing sleeve 33 at intervals along the circumference of the fixing sleeve 33. A frustum-shaped cavity 332 is formed inside the fixing sleeve 33. One end of the clamping teeth 32 located outside the fixing sleeve 33 is threadedly connected to the screwing part 31. The outer wall of the end of the clamping teeth 32 located inside the fixing sleeve 33 is adapted to the shape of the frustum-shaped cavity 332 and the inner wall is in contact with the outer wall of the pipe fitting. The fixed sleeve 33 is inclinedly provided with a channel 331 connecting the inner wall and the outer wall. Clamping teeth 32 are arranged within the channel 331. By rotating the screwing part 31, the clamping teeth 32 are driven to move within the channel to extend or retract, thereby securing the ends of the clamping teeth 32 between the pipe and the frustum-shaped cavity 332, thus ensuring a tight clamp and preventing rotation during cutting. Admittedly, in other embodiments, the locking part can be configured similarly to a blade bar and inner cam ring structure. The screwing part 31 drives the inner cam ring to rotate, causing the blade bar to abut against the outside of the pipe, thereby clamping the pipe. Of course, other structures can also be provided, as long as the above effect is achieved; no specific limitation is made here.

[0035] In one embodiment, a support member 111 is provided between the pipe locking assembly 30 and the cutting assembly. The support member 111 includes a support base fixedly connected to the housing 10 and a bearing disposed within the support base, the axis of the bearing being collinear with the axis of the inlet. By providing the support member 111 between the pipe locking assembly 30 and the cutting assembly to support the pipe, preferably, when the cutting blade 26 is in the first position, the projection of its axial direction onto the bearing does not exceed the inner ring of the bearing, so as to avoid the pipe shaking and colliding, damaging the cutting blade 26.

[0036] In one embodiment, a handle 121 is provided on the housing 10, and a handle 122 is provided on the handle 121 to control the opening or closing of the drive assembly. The housing 10 includes an upper housing 12 and a lower housing 11 that are detachably connected. The handle 121 is located on the top of the upper housing 12 for easy gripping, and a handle 122 is provided at the end of the handle 121 to facilitate starting or stopping the machine with one hand, freeing up the other hand to move the pipe, reducing the difficulty of operation, and making it suitable for single-person cutting.

[0037] This application achieves automated cutting by setting a drive assembly to drive the cutter holder to rotate the cutting blade within the inner cam ring, and by driving the cutter bar to switch the cutting blade between a first position far from the center of the inner cam ring and a second position close to the center of the inner cam ring. In addition, by using at least one of the cutter bars as an eccentric shaft to arrange the cutting blade in the same plane, the cut of the pipe is smooth and flat, reducing subsequent rework and improving processing efficiency.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A handheld automatic pipe cutting machine, characterized in that, The handheld automatic pipe cutting machine includes: A housing having a cavity formed therein and inlets and outlets symmetrically formed on both sides of the housing communicating with the cavity; a pipe enters from the inlet and extends out from the outlet; A cutting mechanism is disposed within the accommodating cavity. The cutting mechanism includes an inner cam ring coaxially disposed with the inlet, at least one pair of cutting assemblies circumferentially spaced within the inner cam ring, and a drive assembly for rotating the cutting assemblies within the inner cam ring. The cutting assembly includes a blade rod radially abutting against the inner wall of the inner cam ring, a cutting blade connected to the blade rod, and a blade holder slidably connected to the blade rod. At least one of the blade rods is an eccentric shaft to arrange the cutting blade in the same plane. The inner cam ring has a plurality of circular tracks arranged radially in a one-to-one configuration with the cutting assembly. The centers of the plurality of circular tracks do not coincide, and the end of the cutter bar abuts against the inner wall of the circular tracks. The circular track includes a starting position where the cutting blade is in a first position, a transition segment from the first position to a second position and from the second position to the first position, and a cutting segment that is always in the second position, to completely cut the pipe fitting and avoid incomplete cutting of the pipe fitting at the starting position and the transition segment; The drive assembly is connected to the cutter holder. Under the drive of the drive assembly, the cutter has a first position away from the center of the inner cam ring and a second position close to the center of the inner cam ring. The cutter is located in the first position away from the pipe fitting that passes through the inner cam ring. The cutter is located in the second position with part of the cutter extending into the inside of the pipe fitting.

2. The handheld automatic pipe cutting machine as described in claim 1, characterized in that, A roller is provided at the end of the cutter bar that abuts against the circular track.

3. The handheld automatic pipe cutting machine as described in claim 1, characterized in that, The drive assembly includes a drive member and a transmission bevel gear meshing with the output shaft of the drive member. The center of the transmission bevel gear is provided with a through hole that is collinear with the inlet axis for the pipe to pass through. The tool holder is fixedly connected to the back of the transmission bevel gear.

4. The handheld automatic pipe cutting machine as described in claim 3, characterized in that, The tool holder includes a fixed base and a linear bearing disposed within the fixed base, the linear bearing being sleeved on the tool holder.

5. The handheld automatic pipe cutting machine as described in claim 1, characterized in that, The handheld automatic pipe cutting machine also includes a pipe locking assembly located at the inlet. The pipe locking assembly includes a screwing part located outside the housing and a locking part located inside the housing. The locking part is configured to clamp or release the pipe under the drive of the screwing part.

6. The handheld automatic pipe cutting machine as described in claim 5, characterized in that, A meshing connection structure is formed between the screwing part and the locking part, and the screwing part drives the locking part to clamp or loosen the pipe fitting through the meshing connection structure.

7. The handheld automatic pipe cutting machine as described in claim 6, characterized in that, The locking part includes a fixing sleeve sleeved on the outside of the pipe fitting and a plurality of clamping teeth arranged obliquely through the fixing sleeve at intervals along the circumference of the fixing sleeve. A frustum-shaped cavity is formed inside the fixing sleeve. One end of the clamping teeth located outside the fixing sleeve is threadedly connected to the screwing part. The outer wall of the end of the clamping teeth located inside the fixing sleeve is adapted to the shape of the frustum-shaped cavity and the inner wall is in contact with the outer wall of the pipe fitting.

8. The handheld automatic pipe cutting machine as described in claim 6, characterized in that, A support member is provided between the pipe locking assembly and the cutting assembly. The support member includes a support base fixedly connected to the housing and a bearing disposed in the support base. The axis of the bearing is collinear with the axis of the inlet.

9. The handheld automatic pipe cutting machine as described in claim 1, characterized in that, The housing is provided with a handle, and the handle is provided with a switch component for controlling the drive component to be turned on or off.

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