Cutting device for round tubes

Abstract

The utility model discloses a cutting device for round pipe, support is installed on the round pipe of cutting, and support is distributed around the round pipe of cutting, at least one drive unit is fixed on the support, and the drive unit is equipped with driving wheel, at least one driven unit is fixed on the support, and the driven unit is equipped with driven wheel, and the support is supported on the round pipe of cutting only by driving wheel and driven wheel, and driving wheel drives the support to make the circumferential motion around the axis of the round pipe of cutting, cutting machine unit is installed on the support, and the cutting machine unit is equipped with saw blade for cutting, and the saw blade cutting depth subassembly is equipped between cutting machine unit and the support, and is used for adjusting the spacing between saw blade rotation center line and the axis of the round pipe of cutting. Adjusting saw blade cutting depth, and driving assembly drives the support to carry cutting machine unit to surround the round pipe a circle or surround the setting angle, realizes the cutting to the round pipe, greatly reduces workpiece strength and improves the production efficiency of round pipe cutting, avoids the safety problem of manual cutting.

Description

Technical Field

[0001] This utility model relates to the field of cutting machine technology, and more specifically to a cutting device for round tubes. Background Technology

[0002] When cutting large-diameter pipes at pipeline construction and installation sites, large equipment cannot be used due to site conditions. Currently, electric circular saws, angle grinders, and new pipe cutting machines are mainly used.

[0003] Among these, circular saws involve high work intensity, make it difficult to achieve a smooth cut, and pose significant safety risks when used manually; they cannot be used in special working conditions and must be replaced by angle grinders. However, angle grinders also pose high safety risks, involve high work intensity, and produce uneven cuts.

[0004] The new pipe cutting machine is still entirely manual, requiring two to three people to work together when cutting larger diameter pipes, and cannot be used under special working conditions.

[0005] The tools commonly used for cutting large-diameter pipes mentioned above are inefficient, produce uneven cuts, are difficult to use under special conditions, pose safety risks, and are physically demanding. Furthermore, manual cutting can lead to uneven cuts requiring secondary adjustments due to instability issues; it can also cause safety problems such as saw blade jamming, tooth breakage, and clothing getting caught in the cutting machine. Utility Model Content

[0006] To address the aforementioned shortcomings of existing technologies, a cutting device for round pipes is provided, which improves pipe cutting efficiency and quality while ensuring cutting safety.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: Portable large-diameter round pipe automatic cutting machine, including The bracket is installed on the circular tube to be cut, and the bracket is arranged around the circular tube to be cut; A drive unit, at least one drive unit is fixed on a bracket, and a drive wheel is provided inside the drive unit; At least one driven unit is fixed on the support, and a driven wheel is provided inside the driven unit; the support is supported on the circular tube to be cut by only the driving wheel and the driven wheel, and the driving wheel drives the support to make circular motion around the axis of the circular tube to be cut; The cutting machine unit is mounted on a bracket and contains a saw blade for cutting. A saw blade cutting depth assembly is located between the cutting machine unit and the bracket to adjust the distance between the saw blade rotation center line and the axis of the circular tube to be cut.

[0008] According to the above technical solution, the support includes multiple support units and a locking unit; the multiple support units are hinged together end to end to form a strip structure, and the locking unit is divided into two parts, one part is located at the head of the strip structure and the other part is located at the tail of the strip structure. The strip structure is connected end to end by the locking units to form a ring structure, and the ring structure surrounds the circular tube to be cut; the locking unit adjusts the tightness of the ring structure so that the support is supported on the circular tube to be cut by only the driving wheel and the driven wheel.

[0009] According to the above technical solution, the cutting machine unit and the saw blade cutting depth assembly are installed on one of the support units, and the drive unit and the driven unit are distributed on all the support units.

[0010] According to the above technical solution, the support includes an upper support assembly and a lower support assembly, and the cutting machine unit and the saw blade cutting depth assembly are installed on the upper support assembly; The upper support assembly has at least two driven units, and the lower support assembly has at least one driven unit and at least one driving unit; or, the lower support assembly has at least two driven units, and the upper support assembly has at least one driven unit and at least one driving unit.

[0011] According to the above technical solution, the support unit includes a main support unit and multiple auxiliary support units. The cutting machine unit and the saw blade cutting depth assembly are installed on the main support unit. Each auxiliary support unit is provided with a driven unit or a driving unit to form a driven module or a driving module. The locking unit is connected between the main support unit and the auxiliary support units, or between the auxiliary support units. Determine the number and distribution of the driven and driven modules based on the dimensions of the circular tube to be cut.

[0012] According to the above technical solution, a number of driving units are provided on the main support unit; or, a number of driven units are provided on the main support unit; or, a number of driven units and a number of driving units are provided on the main support unit.

[0013] According to the above technical solution, the locking unit includes a first mounting base fixed on one side of the support unit, a second mounting base fixed on the adjacent support unit on the other side, a first rotating shaft fixed on the first mounting base, a first locking bolt rotatably connected to the first rotating shaft, a first locking nut threaded onto the locking bolt, and a first locking plate fixed on the second mounting base; a locking interface is provided on the first locking plate; the first locking bolt rotates to the locking interface to tighten the first locking nut; or the first locking nut is loosened and the first locking bolt rotates out of the locking interface; thereby realizing the locking or unlocking of the locking unit; It also includes a hinge assembly, which includes a second pivot rotatably connected to one side support unit, a third pivot rotatably connected to an adjacent other side support unit, and a connecting plate fixedly connected to the ends of the first and second pivots.

[0014] According to the above technical solution, two parallel first guide plates are provided on the first mounting base, and two matching second guide plates are provided on the second mounting base; the distance between the inner sides of the first guide plates and the distance between the outer sides of the second guide plates are equal.

[0015] According to the above technical solution, the drive unit includes a drive motor fixed on the bracket, a drive shaft rotatably connected to the bracket, drive wheels fixed on both sides of the drive shaft, and a gear transmission pair connected between the drive motor and the drive shaft; the drive gear of the gear transmission pair is fixed on the output shaft of the drive motor, and the driven gear of the gear transmission pair is fixed on the drive shaft. The driven unit includes a driven shaft rotatably connected to the bracket and driven wheels fixed on both sides of the driven shaft.

[0016] According to the above technical solution, the cutting machine unit includes a cutting machine mounting frame rotatably connected to a bracket at one end, and a cutting machine motor fixed on the cutting machine mounting frame; the saw blade is fixedly connected to the output shaft of the cutting machine motor. The saw blade cutting depth assembly includes a depth adjustment bracket fixed on the support assembly, an adjustment screw fixed on the cutting machine mounting frame, and a fastening nut threaded onto the adjustment screw. The depth adjustment bracket has an arc-shaped groove. One end of the adjustment screw is fixed on the cutting machine mounting frame, and the other end passes through the arc-shaped groove and connects to the fastening nut. After the adjustment screw is adjusted to the set position of the arc-shaped groove, the fastening nut is tightened to fix the adjustment screw and the depth adjustment.

[0017] This utility model has the following beneficial effects: 1. Install the bracket onto the round pipe to be cut, and adjust the bracket so that it is firmly held onto the pipe by the driving and driven wheels. The bracket is supported on the pipe by the driving and driven wheels. Driven by the driving wheels and guided by the driven wheels, the bracket can carry the cutting machine unit and the saw blade cutting depth assembly in a circular motion on the round pipe. After the bracket is installed on the round pipe, start the cutting machine unit, adjust the saw blade cutting depth using the saw blade cutting depth assembly, and then start the drive unit to drive the driving wheel to push the entire cutting machine to rotate at a constant speed in a circular motion along the outer wall of the round pipe until the pipe is cut.

[0018] Based on the above measures, once the drive unit is turned on, the device can operate completely without human intervention, greatly reducing the workpiece strength and improving the production efficiency of round tube cutting, while avoiding the safety issues of manual cutting.

[0019] 2. Two types of support structures are provided to diversify the structure of the cutting machine, meet the needs of different scenarios, and improve the applicability of the cutting machine.

[0020] 3. The support system includes a main support unit housing the cutting machine unit and saw blade cutting depth assembly; an auxiliary support unit with a drive module composed of drive components; and a driven module composed of driven components. Based on the size of the pipe to be cut, a corresponding number of drive modules and driven modules are selected, and the drive modules, driven modules, and main support unit are connected to form a ring support, which is then installed on the pipe to be cut. Based on the above measures, a single device can complete the cutting of various sizes of pipes by selecting a corresponding number of drive modules and driven modules, thus improving the applicability of this cutting machine.

[0021] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0023] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention; Figure 2 This is a usage state diagram of the first embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the second embodiment of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the second embodiment of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the locking unit provided in the first and second embodiments of this utility model; In the diagram: 1. Support; 2. Circular tube to be cut; 3. Drive unit; 3-1. Drive wheel; 3-2. Drive motor; 3-3. Drive shaft; 3-4. Gear transmission pair; 4. Driven unit; 4-1. Driven wheel; 4-2. Driven shaft; 5. Cutting machine unit; 5-1. Saw blade; 5-2. Cutting machine mounting bracket; 5-3. Cutting machine motor; 5-4. Protective cover; 5-5. Rotating shaft; 6. Saw blade cutting depth assembly; 6-1. Depth adjustment bracket; 6-2. Adjusting screw; 6-3. Fastening nut; 6-4. Auxiliary handle 7. Support unit; 7-1. Upper support assembly; 7-2. Lower support assembly; 7-3. Main support unit; 7-4. Auxiliary support unit; 8. Locking unit; 8-1. First mounting base; 8-2. Second mounting base; 8-3. First pivot; 8-4. First locking bolt; 8-5. First locking nut; 8-6. First locking plate; 8-61. Locking interface; 8-7. First guide plate; 8-8. Second guide plate; 9. Hinge assembly; 9-1. Second pivot; 9-2. Third pivot; 9-3. Connecting plate. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-5 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0025] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Reference Figures 1-5As shown, the cutting device for round pipes provided by this utility model is applied to the installation site of a computer hanging construction project.

[0028] Example 1 include Support 1 is installed on the circular tube 2 to be cut, and the support is arranged around the circular tube to be cut; Drive unit 3, at least one drive unit is fixed on the bracket, and the drive unit is provided with a drive wheel 3-1; Driven unit 4, at least one driven unit is fixed on the support, and the driven unit is provided with a driven wheel 4-1; the support is supported on the circular tube to be cut by only the driving wheel and the driven wheel, and the driving wheel drives the support to make circular motion around the axis of the circular tube to be cut; The cutting machine unit 5 is mounted on the support and contains a saw blade 5-1 for cutting. A saw blade cutting depth assembly 6 is provided between the cutting machine unit and the support to adjust the distance between the center line of the saw blade rotation and the axis of the circular tube to be cut.

[0029] In the above structure, the bracket is installed on the circular pipe to be cut, and the bracket is adjusted so that it is firmly held onto the pipe by the driving and driven wheels. The bracket is supported on the pipe by the driving and driven wheels. Driven by the driving wheels and guided by the driven wheels, the bracket can carry the cutting machine unit and the saw blade cutting depth assembly in a circular motion on the pipe. After the bracket is installed on the pipe, the cutting machine unit is started, and the saw blade cutting depth assembly is used to adjust the cutting depth of the cutting machine unit. Then, the drive unit is turned on, driving the driving wheel to push the entire cutting machine to rotate at a constant speed in a circular motion along the outer wall of the pipe until the pipe is cut.

[0030] Based on the above measures, once the drive unit is turned on, the device can operate completely without human intervention, greatly reducing the workpiece strength and improving the production efficiency of round tube cutting, while avoiding the safety issues of manual cutting.

[0031] Example 2 Based on Embodiment 1, the support includes multiple support units 7 and a locking unit 8; the multiple support units are hinged together end to end to form a strip structure, the locking unit is divided into two parts, one part is located at the head of the strip structure and the other part is located at the tail of the strip structure, the strip structure is connected end to end to form a ring structure, the ring structure surrounds the circular tube to be cut; the locking unit adjusts the tightness of the ring structure so that the support is supported on the circular tube to be cut by only the driving wheel and the driven wheel.

[0032] Multiple support units are hinged to form a strip structure, and the adjustment structure is connected into a ring structure by a locking unit to realize the installation on the circular tube to be cut; the tightness of the ring structure is adjusted by the locking unit so that the support holds the circular tube to be cut by each driving wheel and driven wheel.

[0033] Based on the above stent structure, three preferred stent structures are presented: In the first configuration, the cutting machine unit and the saw blade cutting depth assembly are mounted on one of the support units, while the drive unit and the driven unit are distributed on all the support units.

[0034] like Figure 1-2 As shown, the support includes an upper support assembly 7-1 and a lower support assembly 7-2, with the cutting machine unit and saw blade cutting depth assembly mounted on the upper support assembly.

[0035] The upper support assembly has at least two driven units, and the lower support assembly has at least one driven unit and at least one driving unit; or, the lower support assembly has at least two driven units, and the upper support assembly has at least one driven unit and at least one driving unit.

[0036] The upper and lower support assemblies are connected on one side by a hinge and on the other side by a locking unit, which locks the upper and lower support assemblies onto the circular tube. The drive unit drives the support, carrying the cutting machine unit and saw blade cutting depth assembly, to make circular motion on the circular tube via the drive wheel.

[0037] The second type, such as Figure 3-5 As shown, the support unit includes a main support unit 7-3 and multiple auxiliary support units 7-4. The cutting machine unit and the saw blade cutting depth assembly are installed on the main support unit. Each auxiliary support unit is provided with a driven unit or a driving unit to form a driven module or a driving module. The locking unit is connected between the main support unit and the auxiliary support units, or between the auxiliary support units. The number and distribution of the driven modules and driving modules are determined according to the size of the round tube to be cut.

[0038] A second type of cutting machine is used. The number of driven and driven modules is determined based on the size of the circular pipe to be cut. If the pipe diameter is too large, one or more driven modules can be added. Multiple driven modules can be connected adjacent to each other in one location, or multiple driven modules can be placed between two adjacent driven modules. A chain structure composed of driven and driven modules is connected to both sides of the main support unit. Locking units are located within the chain structure, and can be positioned between driven and driven modules, or between driven and driven modules, or between driven and driven modules, depending on requirements. Locking units can also be positioned between the chain structure and the main support unit.

[0039] The third method, to avoid direct contact between the main support unit and the circular tube, involves providing several drive units on the main support unit, building upon the second method; or, providing several driven units on the main support unit; or, providing both several driven units and several drive units on the main support unit. This third method is not shown in the illustrated embodiment. The circular tube contacts the drive wheel or driven wheel located on the main support unit.

[0040] Based on the second and third structural forms of the support, the support includes a main support unit with a cutting machine unit and a saw blade cutting depth assembly, an auxiliary support unit with a drive module composed of a drive assembly, and a driven module composed of a driven assembly. According to the size of the pipe to be cut, a corresponding number of drive modules and driven modules are selected, and the drive modules, driven modules, and main support unit are connected to form a ring support, which is then installed on the circular pipe to be cut. Based on the above measures, a single device can complete the cutting of circular pipes of various sizes and specifications by selecting a corresponding number of drive modules and driven modules, thus improving the applicability of this cutting machine.

[0041] Example 3 Based on Embodiment 2, a preferred structural form of the locking unit is given.

[0042] The locking unit includes a first mounting base 8-1 fixed on one side of the support unit, a second mounting base 8-2 fixed on the adjacent support unit on the other side, a first rotating shaft 8-3 fixed on the first mounting base, a first locking bolt 8-4 rotatably connected to the first rotating shaft, a first locking nut 8-5 threadedly connected to the locking bolt, and a first locking plate 8-6 fixed on the second mounting base; the first locking plate is provided with a locking interface 8-61; the first locking bolt is rotated to the locking interface to tighten the first locking nut; or the first locking nut is loosened and the first locking bolt is rotated out of the locking interface; thus realizing the locking or unlocking of the locking unit.

[0043] When the locking unit needs to be locked, the first locking bolt is rotated into the locking interface of the first locking plate, and then the first locking nut is tightened. The preload between the first locking nut and the first locking plate is used to connect the first mounting base and the second mounting base. When the locking unit needs to be unlocked, the first locking bolt is rotated in the opposite direction to unlock the locking unit.

[0044] In addition, to ensure that the first and second mounting seats move relative to each other in a predetermined direction, the first mounting seat is provided with two parallel first guide plates 8-7, and the second mounting seat is provided with two matching second guide plates 8-8; the distance between the inner sides of the first guide plates and the distance between the outer sides of the second guide plates are equal. When the locking unit is engaged, the inner sides of the first guide plates are abutted against the outer sides of the second guide plates. Alternatively, the distance between the outer sides of the first guide plates and the distance between the inner sides of the second guide plates are equal, and when the locking unit is engaged, the outer sides of the first guide plates are abutted against the inner sides of the second guide plates.

[0045] It also includes a hinge assembly 9, which includes a second pivot 9-1 rotatably connected to one side support unit, a third pivot 9-2 rotatably connected to the adjacent other side support unit, and a connecting plate 9-3 fixedly connected to the ends of the first and second pivots.

[0046] Other hinge structures can also be used, as long as the bracket components can rotate relative to each other.

[0047] Based on embodiments 1-3, a preferred structural form of the drive unit, driven unit, cutting machine unit, and saw blade cutting depth assembly is given.

[0048] The drive unit includes a drive motor 3-2 fixed on a bracket, a drive shaft 3-3 rotatably connected to the bracket, drive wheels 3-1 fixed on both sides of the drive shaft, and a gear transmission pair 3-4 connecting the drive motor and the drive shaft. The drive gear of the gear transmission pair is fixed on the output shaft of the drive motor, and the driven gear of the gear transmission pair is fixed on the drive shaft. The driven unit includes a driven shaft 4-2 rotatably connected to the bracket and driven wheels 4-1 fixed on both sides of the driven shaft. The drive wheels and driven wheels generally use wheel sets with high friction, such as rubber rollers. The drive motor drives the rubber rollers to rotate, so that the drive wheels drive the bracket and all components on the bracket to rotate together around the circular tube.

[0049] The cutting machine unit includes a cutting machine mounting bracket 5-2, one end of which is rotatably connected to a support via a rotating shaft 5-5, and a cutting machine motor 5-3 fixed on the cutting machine mounting bracket; the saw blade is fixedly connected to the output shaft of the cutting machine motor. Preferably, to avoid the splashing of debris generated during pipe cutting, a protective cover 5-4 is provided on the cutting machine mounting bracket around the saw blade, the protective cover covering the side of the saw blade away from the axis of the circular pipe.

[0050] The saw blade cutting depth assembly includes a depth adjustment bracket 6-1 fixed to the support assembly, an adjustment screw 6-2 fixed to the cutting machine mounting bracket, and a fastening nut 6-3 threadedly connected to the adjustment screw. The depth adjustment bracket has an arc-shaped groove. One end of the adjustment screw is fixed to the cutting machine mounting bracket, and the other end passes through the arc-shaped groove and connects to the fastening nut. After the adjustment screw is adjusted to the set position of the arc-shaped groove, the fastening nut is tightened to fix the adjustment screw and the depth adjustment mechanism. The saw blade cutting depth assembly has two arrangement forms, as detailed below: One, such as Figure 1-2 As shown, the arc-shaped groove and the adjusting screw are located on a plane parallel to the rotation surface of the drive wheel. By tightening the locking nut, the friction between the locking nut and the depth-of-cut adjustment bracket achieves a fixed connection between the adjusting screw and the depth-of-cut adjustment bracket. An auxiliary handle 6-4 is also included, fixed to the end of the adjusting nut. The cutting machine mounting bracket is rotatably connected to the bracket via a rotating shaft, changing the position of the adjusting screw on the arc-shaped groove of the depth-of-cut adjustment bracket. Tightening the locking nut with the auxiliary handle fixes the adjusting screw and the depth-of-cut adjustment bracket, thereby controlling the cutting depth of the saw blade.

[0051] Another type, such as Figure 3-5 As shown, the adjusting screw and the drive wheel axis are parallel. By tightening the locking nut, the friction between the locking nut and the depth-of-cut adjustment bracket is used to achieve a fixed connection between the adjusting screw and the depth-of-cut adjustment bracket. An auxiliary handle 6-4 is also included. The auxiliary handle is fixed to the cutting machine mounting bracket, which is rotatably connected to the bracket via a rotating shaft. The auxiliary handle changes the position of the adjusting screw on the arc-shaped groove of the depth-of-cut adjustment bracket, and the locking nut secures the adjusting screw and the depth-of-cut adjustment bracket, thereby controlling the cutting depth of the saw blade.

[0052] The construction process for cutting large-diameter circular pipes using this invention is as follows: Step 1: Select the appropriate cutting machine based on the specifications of the pipe to be cut.

[0053] Step 2: Install the bracket at the required cutting position on the round tube to be cut; lock the bracket by the first locking nut of the locking unit so that the bracket itself does not contact the round tube to be cut, and the bracket is indirectly supported on the outer wall of the round tube to be cut through the driving wheel and the driven wheel.

[0054] Step 3: Power on the cutting machine unit, adjust the angle between the cutting machine mounting bracket and the support, and fix the cutting machine mounting bracket and the depth adjustment bracket by tightening the bolts of the saw blade cutting depth assembly to solidify the current position of the saw blade.

[0055] Step 4: Turn on the drive motor of the drive unit. The drive motor drives the drive wheel to make circular motions around the outer wall of the tube to be cut. The drive unit pushes the bracket and saw blade to circle the tube once, or circle the tube at a set angle, to achieve cutting of the entire tube or a portion of it at a certain angle. Then disconnect the power to the cutting machine and disassemble the equipment.

[0056] If the second or third type of support structure is adopted; the support unit includes a main support unit and multiple auxiliary support units, the cutting machine unit and the saw blade cutting depth assembly are installed on the main support unit, and each auxiliary support unit is provided with a driven unit or a driving unit to form a driven module or a driving module; in step one, according to the size of the round tube to be cut, a set number of driven modules and driving modules are selected, and the driven modules and driving modules are assembled in a set connection order to form the cutting device for the round tube.

[0057] The cutting machine described in this utility model is mainly used for cutting large-diameter pipes; it is most suitable for construction sites of large-diameter PE and steel wire mesh reinforced pipe projects.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A cutting device for round tubes, characterized in that: include The bracket is installed on the round tube to be cut, and the bracket is arranged around the round tube to be cut; A drive unit, at least one drive unit is fixed on a bracket, and a drive wheel is provided inside the drive unit; Driven unit, at least one driven unit is fixed on the bracket, and the driven unit is provided with a driven wheel; The support is supported on the circular tube to be cut by only the driving wheel and the driven wheel. The driving wheel drives the support to make circular motion around the axis of the circular tube to be cut. The cutting machine unit is mounted on a bracket and contains a saw blade for cutting. A saw blade cutting depth assembly is located between the cutting machine unit and the bracket to adjust the distance between the saw blade rotation center line and the axis of the circular tube to be cut.

2. The cutting device for round tubes according to claim 1, characterized in that: The support includes multiple support units and a locking unit; the multiple support units are hinged together end to end to form a strip structure; the locking unit is divided into two parts, one part is located at the head of the strip structure and the other part is located at the tail of the strip structure; the strip structure is connected end to end by the locking units to form a ring structure, and the ring structure surrounds the circular tube to be cut; the locking unit adjusts the tightness of the ring structure so that the support is supported on the circular tube to be cut by only the driving wheel and the driven wheel.

3. The cutting device for round tubes according to claim 2, characterized in that: The cutting machine unit and saw blade cutting depth assembly are mounted on one of the support units, while the drive unit and driven unit are distributed on all the support units.

4. The cutting device for round tubes according to claim 3, characterized in that: The support includes an upper support assembly and a lower support assembly, with the cutting machine unit and saw blade depth-of-cut assembly mounted on the upper support assembly; The upper support assembly has at least two driven units, and the lower support assembly has at least one driven unit and at least one driving unit; or, the lower support assembly has at least two driven units, and the upper support assembly has at least one driven unit and at least one driving unit.

5. The cutting device for round tubes according to claim 2, characterized in that: The support unit includes a main support unit and multiple auxiliary support units. The cutting machine unit and the saw blade cutting depth assembly are mounted on the main support unit. Each auxiliary support unit is provided with a driven unit or a driving unit to form a driven module or a driving module. The locking unit is connected between the main support unit and the auxiliary support units, or between the auxiliary support units. Determine the number and distribution of the driven and driven modules based on the dimensions of the circular tube to be cut.

6. The cutting device for round tubes according to claim 5, characterized in that: The main support unit has several driving units; or, the main support unit has several driven units; or, the main support unit has several driven units and several driving units.

7. The cutting device for round tubes according to any one of claims 2-6, characterized in that: The locking unit includes a first mounting base fixed on one side of the support unit, a second mounting base fixed on the adjacent support unit on the other side, a first rotating shaft fixed on the first mounting base, a first locking bolt rotatably connected to the first rotating shaft, a first locking nut threaded onto the locking bolt, and a first locking plate fixed on the second mounting base. The first locking plate has a locking interface. The first locking bolt rotates to the locking interface to tighten the first locking nut; or the first locking nut is loosened, and the first locking bolt rotates out of the locking interface, thus achieving locking or unlocking of the locking unit. It also includes a hinge assembly, which includes a second pivot rotatably connected to one side support unit, a third pivot rotatably connected to an adjacent other side support unit, and a connecting plate fixedly connected to the ends of the first and second pivots.

8. The cutting device for round tubes according to claim 7, characterized in that: Two parallel first guide plates are provided on the first mounting base, and two matching second guide plates are provided on the second mounting base; the distance between the inner sides of the first guide plates and the distance between the outer sides of the second guide plates are equal.

9. The cutting device for round tubes according to claim 1, characterized in that: The drive unit includes a drive motor fixed on a bracket, a drive shaft rotatably connected to the bracket, drive wheels fixed on both sides of the drive shaft, and a gear transmission pair connected between the drive motor and the drive shaft; the drive gear of the gear transmission pair is fixed on the output shaft of the drive motor, and the driven gear of the gear transmission pair is fixed on the drive shaft. The driven unit includes a driven shaft rotatably connected to the bracket and driven wheels fixed on both sides of the driven shaft.

10. The cutting device for round tubes according to claim 1, characterized in that: The cutting machine unit includes a cutting machine mounting frame rotatably connected to a bracket at one end, and a cutting machine motor fixed to the cutting machine mounting frame; the saw blade is fixedly connected to the output shaft of the cutting machine motor. The saw blade cutting depth assembly includes a depth adjustment bracket fixed on the support assembly, an adjustment screw fixed on the cutting machine mounting frame, and a fastening nut threaded onto the adjustment screw. The depth adjustment bracket has an arc-shaped groove. One end of the adjustment screw is fixed on the cutting machine mounting frame, and the other end passes through the arc-shaped groove and connects to the fastening nut. After the adjustment screw is adjusted to the set position of the arc-shaped groove, the fastening nut is tightened to fix the adjustment screw and the depth adjustment.

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