Beveling Machine

Abstract

The present invention relates to a beveling machine, which belongs to the field of processing equipment. The beveling machine includes a frame, a main shaft, a tensioning mechanism and a cutting mechanism, and is characterized in that the frame is connected to the main shaft, and the tensioning mechanism and the cutting mechanism are arranged on the main shaft; the tensioning mechanism includes: a first push rod, a second push rod, a first piston and a second piston, the first piston includes a first piston body and a first piston cylinder; the first piston body is fixed on the main shaft, the first piston body is the cylinder of the second piston, and the second piston is arranged superimposed on the first piston; the first piston cylinder is movably connected to the first push rod to drive the first push rod, and the second piston is movably connected to the second push rod to drive the second push rod. The beveling machine provided by the present invention reduces the requirements of the beveling machine on the length of the straight pipe section of the pipeline, while enhancing the stability and safety during the processing.

Description

Technical Field

[0001] The present invention relates to the field of processing equipment, in particular to a beveling machine. Background Art

[0002] With the development of the natural gas, oil, and chemical industries, internal expansion beveling machines have become indispensable beveling equipment in pipeline construction operations. The existing double-piston internal expansion beveling machines, affected by the size of the tensioning mechanism, have requirements for the minimum length of the straight pipe section of the pipeline. When the straight pipe section is less than this length, it cannot be clamped. For example, the length of the straight pipe section of the pipeline is required to be greater than 1 meter. However, according to technical specifications, the minimum length of the straight pipe section on the elbow in actual construction is often less than the minimum length required by the internal expansion beveling machine. For example, the length of the straight pipe section in actual construction may be only 500mm or less. For elbows with a straight pipe section length less than the minimum length required by the beveling machine, it cannot be used. External clamping beveling machines are mostly used in construction. However, external clamping pipe beveling machines cannot automatically align and center, and have low beveling efficiency and poor beveling stability.

[0003] CN103358144B discloses an internal expansion clamping mechanism for a beveling machine. The mechanism features a hydraulic cylinder that pushes the front and rear push rods out synchronously during operation, achieving tension and clamping. A problem with this technology is that, in practical applications, the inner wall cross-section of the pipe being processed may not be a perfect circle due to factors such as casting errors and transportation and stacking. If the pipe cross-section is elliptical or concave, the front and rear push rods of this internal expansion clamping mechanism may be fully expanded, hindering the continued movement of the hydraulic cylinder and preventing the other push rod from fully expanding. In this case, the clamping effect of the tensioning mechanism is greatly reduced, further affecting the stability and safety of the entire beveling process. Furthermore, the tensioning mechanism utilizes an integrated hydraulic cylinder, which places high demands on the hydraulic pressure of the single cylinder. This increases the manufacturing difficulty and manufacturing cost of the beveling machine's tensioning mechanism.

[0004] Furthermore, during pre-welding preparation, the inner wall of the pipe joint often needs to be internally bored to ensure that the thickness of the pipe wall at the joint meets the technical specifications. Existing beveling machines fail to achieve the required depth during internal boring. There is a need for a beveling machine that can both bevel the pipe end faces and bore the inner wall of the pipe joint to a greater depth. Summary of the Invention

[0005] According to the first aspect of the present invention, the present invention provides a beveling machine that uses two superimposed pistons to drive the front and rear push rods respectively, shortening the distance between the front and rear push rods, thereby reducing the requirement for the straight pipe length of the internal expansion beveling machine. In addition, the method of asynchronously driving the front and rear push rods of the tensioning mechanism by the dual pistons enhances the clamping effect of the tensioning mechanism of the internal expansion beveling machine compared to the prior art, thereby improving the stability and safety of the beveling machine. Furthermore, by improving the tool holder assembly in the cutting mechanism of the beveling machine, while achieving greater depth internal boring using the beveling machine, the strength of the tool holder assembly is increased, thereby improving the stability of the internal boring.

[0006] (1) A beveling machine comprises a frame, a main shaft, a tensioning mechanism and a cutting mechanism, wherein the frame is connected to the main shaft, and the tensioning mechanism and the cutting mechanism are arranged on the main shaft; the tensioning mechanism comprises: a first push rod, a second push rod, a first piston and a second piston, wherein the first piston comprises a first piston body and a first piston cylinder; the first piston body is fixed to the main shaft, the first piston body is the cylinder of the second piston, and the second piston is arranged to overlap with the first piston; the first piston cylinder is movably connected to the first push rod to drive the first push rod, and the second piston is movably connected to the second push rod to drive the second push rod.

[0007] (2) According to the beveling machine described in (1), the second piston includes a second piston body and a second piston rod, the second piston rod is fixedly connected to the second piston body and movably connected to the second push rod, and the second piston body drives the second piston rod and then drives the second push rod.

[0008] (3) According to the beveling machine described in (1) or (2), the first piston also includes a first cylinder head, and the second piston also includes a second cylinder head; the first cylinder head is fixedly connected to the first piston cylinder barrel, serving as the cylinder head of the piston cylinder corresponding to the first piston; the second cylinder head is fixedly connected to the first piston body, serving as the cylinder head of the piston cylinder corresponding to the second piston.

[0009] (4) In the beveling machine according to any one of (1) to (3), the second piston body moves in a space formed by the main shaft and the first piston body; and the first piston cylinder moves on the first piston body.

[0010] (5) In the beveling machine according to any one of (1) to (4), the first piston cylinder and the second piston body move in the axial direction.

[0011] (6) According to any one of (1) to (5) of the beveling machine, the fixing method of the first piston body on the main shaft includes bolt connection, riveting and welding; the fixing connection method between the first cylinder head and the first piston cylinder includes bolt connection, riveting and welding; the fixing connection method between the second cylinder head and the first piston body includes bolt connection, riveting and welding; the first piston cylinder and the first push rod are movably connected by a hinge; the second piston rod and the second push rod are movably connected by a hinge; the connection method of the second piston rod and the second piston body includes: threaded connection, bolt connection, welding, snap connection and riveting.

[0012] (7) According to any one of (1) to (6), when the beveling machine is working, the first piston cylinder moves to drive the first push rod to extend radially, and the second piston body moves to drive the second push rod to extend radially, thereby clamping the inner wall of the pipe to be processed; after the beveling machine finishes working, the first piston cylinder moves to drive the first push rod to retract radially, and the second piston body moves to drive the second push rod to retract radially, thereby releasing the clamping of the pipe to be processed.

[0013] (8) According to any one of (1) to (7), the driving forces of the first piston and the second piston are independent of each other, that is, the movement of the first piston cylinder and the movement of the second piston body are independent of each other.

[0014] (9) According to any one of (1) to (8) of the beveling machine, the cutting mechanism includes a cutter disc and a tool holder assembly arranged on the cutter disc; the tool holder assembly includes a cutter rod and a follower wheel arranged in the axial direction, the cutter rod is provided with a blade, the follower wheel is spaced a certain distance from the cutter rod, the follower wheel is arranged radially outside the cutter rod, and the follower wheel abuts against the outer wall of the pipe to be processed during the cutting process.

[0015] (10) According to any one of (1) to (9) of the beveling machine, the tool holder assembly further includes a tool holder mounted on the cutter disc, and the tool rod and the follower wheel are fixed on the tool holder.

[0016] (11) According to any one of (1) to (10), the distance between the follower wheel and the cutter bar is adjustable.

[0017] (12) According to any one of (1) to (11), a groove is provided on the tool holder at the position where the tool rod is fixed, and a screw hole is provided on the radial outer wall of the groove. After the tool rod is placed in the groove, it is fixed to the tool holder by screws. The method of adjusting the distance between the follower wheel and the tool rod includes: replacing tool rods of different sizes, adjusting screws, or adding or removing adjustment gaskets.

[0018] (13) According to any one of (1) to (12), the beveling machine is provided with multiple sets of tensioning mechanisms and multiple sets of cutting mechanisms, and the multiple sets of tensioning mechanisms are symmetrically arranged on the main shaft.

[0019] (14) The beveling machine according to any one of (1) to (13), wherein the working process of the beveling machine is as follows: before the beveling machine works, the first push rod and the second push rod of the tensioning mechanism are extended to tighten and clamp the inner wall of the pipe to be processed, the follower wheel of the cutting mechanism is pressed against the outer wall of the pipe to be processed, and the cutting tip of the blade is placed at the lower part of the inner wall side of the center of the wall thickness of the pipe end face of the pipe to be processed; after the beveling machine is started, the cutter disc drives the tool holder assembly to rotate to perform beveling cutting on the pipe to be processed.

[0020] (15) According to any one of the beveling machines described in (1) to (14), the length of the tool rod is adjustable. When the beveling machine is used for internal boring, the length of the tool rod or the protruding length of the tool rod on the tool holder can be adjusted according to the required internal boring depth.

[0021] (16) The beveling machine according to any one of (1) to (15), wherein the working process of the beveling machine is as follows: before the beveling machine works, the first push rod and the second push rod of the tensioning mechanism are extended to tighten and clamp the inner wall of the pipe to be processed, and the follower wheel of the cutting mechanism is pressed against the outer wall of the pipe to be processed, and the blade is placed on the inner wall of the pipe to be processed by adjusting the length of the tool rod or adjusting the extension length of the tool rod on the tool holder; after the beveling machine is started, the cutter disc drives the tool holder assembly to rotate, and the pipe to be processed is internally bored and cut.

[0022] (17) A tool holder assembly is arranged on the cutter disc of a beveling machine, comprising a tool rod and a follower wheel arranged in the axial direction, wherein the tool rod is provided with a blade, the follower wheel is spaced a certain distance from the tool rod, and the follower wheel is arranged radially outside the tool rod. During the cutting process, the follower wheel abuts against the outer wall of the pipe to be processed.

[0023] (18) According to the tool holder assembly described in (17), the tool holder assembly also includes a tool holder installed on the tool disc, and the tool rod and the follower wheel are fixed on the tool holder.

[0024] (19) In the tool holder assembly according to (17) or (18), the distance between the follower wheel and the tool rod is adjustable.

[0025] (20) According to the tool holder assembly described in (17) to (19), a groove is provided on the tool holder at the position where the tool rod is fixed, and a screw hole is provided on the radial outer wall of the groove. After the tool rod is placed in the groove, it is fixed to the tool holder by screws. The method of adjusting the distance between the follower wheel and the tool rod includes: replacing tool rods of different sizes, adjusting screws, or adding or removing adjustment gaskets.

[0026] (21) According to the tool holder assembly described in (17) to (20), the length of the tool rod is adjustable. When the beveling machine is used for internal boring, the length of the tool rod or the protruding length of the tool rod on the tool holder can be adjusted according to the required internal boring depth.

[0027] The beveling machine provided by the present invention has the following beneficial technical effects:

[0028] (1) The use of two superimposed pistons shortens the distance between the front and rear push rods, thereby reducing the requirement of the internal expansion beveling machine for the straight pipe section length;

[0029] (2) The clamping effect of the tensioning mechanism of the internal expansion beveling machine is enhanced, thereby improving the stability and safety of the beveling machine;

[0030] (3) While realizing the use of the groove machine to perform large-depth internal boring cutting, the safety of large-depth internal boring cutting is guaranteed, the strength of the tool holder assembly is increased, and the stability of the internal boring is improved.

[0031] Explanation of relevant terms involved in this invention:

[0032] (1) Beveling machine: A professional machine that bevels the workpiece before welding to ensure welding quality during the welding manufacturing process;

[0033] (2) Internal expansion beveling machine: When beveling the pipe, the beveling machine uses a tensioning mechanism to clamp the inner wall of the pipe for fixing;

[0034] (3) Ejector rod: The internal expansion beveling machine needs to clamp the pipe (the workpiece to be processed) when it is working. The function of the ejector rod is to clamp the pipe (internal expansion clamping);

[0035] (4) Internal boring: Cutting the wall of the original pipe (the workpiece to be processed) from the inner wall of the pipe to make it thinner;

[0036] (5) Tool bar: a part that clamps and fixes the blade;

[0037] (6) Tool holder: a device for holding the tool bar;

[0038] (7) Cutter head: a device that fixes the cutter holder. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Figure 1 Schematic diagram of the tensioning mechanism of the internal expansion beveling machine in the prior art;

[0041] Figure 2 A schematic diagram of a beveling machine according to one embodiment of the present invention;

[0042] Figure 3 A schematic diagram of a tensioning mechanism of a beveling machine according to an embodiment of the present invention;

[0043] Figure 4 is a schematic diagram of a tensioning mechanism in a clamping state according to one embodiment of the present invention;

[0044] Figure 5 Schematic diagram of the tool holder assembly of the beveling machine in the prior art;

[0045] Figure 6 Schematic diagram of the structure of a tool holder assembly according to one embodiment of the present invention.

[0046] In the figure, 101 is the main shaft, 103 is the rear push rod, 105 is the rear piston cylinder, 107 is the front piston cylinder, 109 is the front push rod, 210 is the frame, 220 is the main shaft, 230 is the tensioning mechanism, 240 is the cutting mechanism, 241 is the tool holder assembly, 242 is the tool disc, 260 is the feeding mechanism, 290 is the pipe to be processed, 291 is the inner wall of the pipe to be processed, 1 is the second push rod, 3 is the second piston rod, 4 is the second cylinder head, 5 is The second piston body, 6 is the first cylinder head, 7 is the first piston cylinder, 8 is the first piston body, 9 is the first push rod, 11 is the tool holder tray, 12 is the tool holder shaft, 13 is the tool holder, 14 is the bearing, 15 is the spring, 16 is the follower wheel, 17 is the tool rod, 510 is the tool holder assembly in the prior art, 511 is the follower wheel, 513 is the tool rod, 515 is the tool holder shaft, 516 is the bearing, 518 is the tool holder tray, 519 is the tool holder, and 520 is the tool disc. DETAILED DESCRIPTION

[0047] Figure 1 Schematic diagram of the tensioning mechanism of the internal expansion beveling machine in the prior art. Figure 1 As shown, the tensioning mechanism includes a rear push rod 103, a rear piston cylinder 105, a front piston cylinder 107 and a front push rod 109. The rear piston cylinder 105 and the front piston cylinder 107 are sequentially arranged on the main shaft 101 along the axial direction.

[0048] During pipe beveling, the rear piston cylinder 105 and the front piston cylinder 107, respectively, extend to clamp the inner wall of the pipe being processed. The front and rear piston cylinders are coaxial and asynchronously driven, enabling automatic alignment and centering. Due to size constraints, this tensioning mechanism requires a straight pipe section greater than one meter. If the straight section of a curved pipe is less than one meter long, it cannot be clamped, making it impossible to use a beveling machine with this tensioning mechanism.

[0049] Figure 2 Schematic diagram of a beveling machine according to one embodiment of the present invention. Figure 2 As shown, the beveling machine provided by the present invention mainly includes a frame 210, a main shaft 220, a tensioning mechanism 230 and a cutting mechanism 240. The frame 210 is connected to the main shaft 220, and the tensioning mechanism 230 and the cutting mechanism 240 are arranged on the main shaft 220.

[0050] The tensioning mechanism 230 is used to tighten and clamp the pipe 290 to be processed on the inner wall 291 of the pipe to be processed by extending the front and rear push rods when processing the pipe 290, thereby fixing the beveling machine on the pipe 290 to be processed.

[0051] The cutting mechanism 240 is used to perform groove processing on the end surface of the pipe 290 and / or perform internal boring processing on the pipe inner wall 291 when processing the pipe 290. The cutting mechanism 240 can include a tool holder assembly 241 and a cutter head 242.

[0052] The beveling machine may be provided with multiple sets of tensioning mechanisms 230 and multiple sets of cutting mechanisms 240, and the multiple sets of tensioning mechanisms 230 are symmetrically arranged on the main shaft 220. Preferably, four sets of tensioning mechanisms 230 are symmetrically arranged on the main shaft 220.

[0053] In some embodiments, the beveling machine provided by the present invention may further include a feeding mechanism 260 for performing an axial feeding operation when processing the pipe 290 to meet the accuracy requirements of the pipe end face beveling and / or the depth requirements of the inner boring of the pipe inner wall.

[0054] Figure 3 FIG. 2 is a schematic diagram of a tensioning mechanism 230 of a beveling machine according to an embodiment of the present invention. Figure 3 As shown, the tensioning mechanism 230 may include: a first push rod 9 , a second push rod 1 , a first piston and a second piston, wherein the first piston may include a first piston body 8 and a first piston cylinder 7 .

[0055] The first piston body 8 is fixed on the main shaft 220. With respect to the second piston, the first piston body 8 is the cylinder of the second piston. The second piston and the first piston are overlapped and arranged radially inward of the first piston. Figure 3In the example, the first piston is the front row piston and the second piston is the rear row piston. Optionally, the first piston can also be the rear row piston and the second piston can also be the front row piston. That is, the stacking order of the above two pistons can be interchanged, that is, the front row piston can be stacked and arranged on the radial inner side of the rear row piston. The application does not limit the stacking order of the two pistons.

[0056] It should be noted that the front and rear rows referred to herein are relative to the direction of the beveling machine's nose. The side closer to the nose is referred to as the front row, and the side closer to the body is referred to as the rear row. The piston in the embodiments of the present invention may be a hydraulic piston, a pneumatic piston, or other piston-type fluid pressure cylinder, preferably a hydraulic piston.

[0057] According to some embodiments of the present invention, the first piston cylinder 7 is movably connected to the first push rod 9 to drive the first push rod 9, and the second piston body 5 is movably connected to the second push rod 1 to drive the second push rod 1. The driving includes extending or retracting the corresponding push rod in the radial direction.

[0058] In some embodiments of the present invention, the second piston may include a second piston body 5 and a second piston rod 3. The second piston rod 3 is fixedly connected to the second piston body 5 and movably connected to the second push rod 1. The second piston body 5 drives the second piston rod 3, which in turn drives the second push rod 1. The second piston rod 3 may be assembled with the second piston body 5 in a fixed connection. Alternatively, the second piston rod 3 may be integrally cast with the second piston body 5, which is not a limitation of the present invention.

[0059] In some embodiments, the first piston may further include a first cylinder head 6, and the second piston may further include a second cylinder head 4. The first cylinder head 6 is fixedly connected to the first piston cylinder 7, serving as the cylinder head of the piston cylinder corresponding to the first piston; the second cylinder head 4 is fixedly connected to the first piston body 8, serving as the cylinder head of the piston cylinder corresponding to the second piston.

[0060] The second piston body 5 moves within the space formed by the main shaft 220 and the first piston body 8, and the first piston cylinder 7 moves on the first piston body 8. In some embodiments, the first piston cylinder 7 and the second piston body 5 move axially in opposite directions. In other embodiments, the movement direction of the first piston cylinder 7 and the movement direction of the second piston body 5 can also be the same.

[0061] In some embodiments, the fixing method of the first piston body 8 on the main shaft 220 may include but is not limited to bolt connection, riveting and welding, etc., preferably bolt connection is adopted. The fixing connection method between the first cylinder head 6 and the first piston cylinder 7, and between the second cylinder head 4 and the first piston body 8 may include but is not limited to bolt connection, riveting and welding, etc., preferably bolt connection is adopted. The first piston cylinder 7 and the first push rod 9 can be connected by, but not limited to, a hinge. When the second piston rod 3 and the second piston body 5 are assembled together, the second piston rod 3 and the second push rod 1 can be connected by, but not limited to, a hinge, and the connection method of the second piston rod 3 and the second piston body 5 includes but is not limited to threaded connection, bolt connection, welding, snap connection and riveting, preferably threaded connection; when the second piston rod 3 and the second piston body 5 are integrated, the second piston body 5 and the second push rod 1 can be connected by, but not limited to, a hinge.

[0062] like Figure 3 As shown, in the non-operating state, the first push rod 9 and the second push rod 1 of the tensioning mechanism 230 are retracted. Before the beveling machine is in operation, the operating handle can be manipulated to cause the first piston cylinder 7 and the second piston body 5 to move axially, respectively pushing the first push rod 9 and the second push rod 1 to extend radially, tightening and clamping them against the inner wall of the pipe to be processed, thereby fixing the beveling machine to the pipe 290 to be processed.

[0063] like Figure 4 Figure 2 shows a schematic diagram of a tensioning mechanism 230 in a clamped state according to one embodiment of the present invention. In the figure, the first piston cylinder 7 moves axially toward the machine head, pushing the first push rod 9 to extend. The second piston body 5 also moves axially toward the machine body, pushing the second push rod 1 to extend. After the first and second push rods 9 and 1 are extended, they are tensioned and clamped against the inner wall of the pipe being processed, securing the beveling machine.

[0064] After the beveling machine is finished working, the first piston cylinder 7 is moved axially toward the machine body by operating the operating handle; the second piston body 5 is moved axially toward the machine head, and the first push rod 9 and the second push rod 1 are respectively retracted radially, thereby releasing the clamping of the pipe 290 to be processed, and the tensioning mechanism 230 can be restored to the state as shown in FIG. Figure 3 Shown in non-operating state.

[0065] In the above embodiment, the moving direction of the first piston cylinder 7 is opposite to the moving direction of the second piston body 5. Optionally, the moving directions of the first piston cylinder 7 and the second piston 5 can be the same by adding other components or changing the layout.

[0066] According to some embodiments of the present invention, the driving forces of the first and second pistons are independent of each other, that is, the movement of the first piston cylinder 7 and the movement of the second piston body 5 are independent of each other, which can be achieved by providing relatively independent pressure fluid supply pipelines. For example, when the pistons are hydraulic pistons, relatively independent oil circuits can be provided to achieve asynchronous driving of the two pistons.

[0067] In the above-described embodiment of the present invention, by stacking two asynchronous pistons, the distance between the front and rear push rods of the internal expansion beveling machine is shortened, reducing the required straight pipe length. This allows the internal expansion beveling machine to be used for pipe bending operations where the straight pipe length is shorter than the minimum required by existing beveling machines. Compared to existing technologies, the use of two stacked asynchronous pistons reduces the manufacturing difficulty and cost of the tensioning mechanism while enhancing the clamping capacity of the beveling machine's tensioning mechanism and improving the stability and safety of the beveling machine during operation.

[0068] During pre-welding of pipe joints before welding, internal boring is often required to ensure that the pipe wall thickness at the joint meets technical specifications. For example, according to current technical specifications, the internal boring depth is typically 120 mm from the pipe joint inward. This depth may change with technological advancements.

[0069] Figure 5 Schematic diagram of the tool holder assembly of the beveling machine in the prior art, as shown in FIG. Figure 5 As shown in Figure (b), during internal boring on a conventional beveling machine, the follower wheel 511 in the tool holder assembly 510 rests against the inner wall of the pipe 290, using the inner wall 291 as a reference for boring. During internal boring, the follower wheel 511 and the cutter bar 513, which is equipped with a blade, are first placed on the inner wall 291 of the pipe. The beveling machine is then started, rotating the cutterhead 520. This, in turn, drives the tool holder assembly 510, and the cutter bar 513, which is equipped with a blade, in the tool holder assembly 510, begins boring. When the internal boring depth is deep, the axle of the follower wheel 511 and the cutter bar 513 need to be lengthened. This lengthened follower wheel 511 may interfere with the tensioning mechanism's ejector pin, thereby impacting the safety of the internal boring process. In order to prevent the knife from vibrating, the knife rod 513 will be thickened while being lengthened. In order to avoid the thickened knife rod 513, the diameter of the corresponding follower wheel 511 also needs to be increased. After the follower wheel 511 is increased, the weight of the knife holder assembly 510 is heavier, and the centrifugal force during operation becomes larger, which affects the service life of the knife disc 520.

[0070] In response to the above problems, the beveling machines provided in other embodiments of the present invention have improved the tool holder assembly 241 of the cutting mechanism 240 .

[0071] Figure 6 FIG. 2 is a schematic structural diagram of a tool holder assembly 241 according to an embodiment of the present invention. Figure 6 As shown, the tool holder assembly 241 may include: a tool holder tray 11 , a tool holder shaft 12 , a tool holder 13 , a bearing 14 , a spring 15 , a follower wheel 16 and a tool rod 17 .

[0072] The tool holder tray 11 is fixed to the cutter disc 242. The tool holder shaft 12 secures the tool holder tray 11 and the cutter disc 242 simultaneously. The tool holder 13 is connected to the cutter disc 242 via the tool holder shaft 12. The tool holder 13 can rotate about the tool holder shaft 12 via a bearing 14. The tool holder 13 is also connected to a spring 15, allowing the internal boring tool holder 13 to float. A follower wheel 16 is positioned on the tool holder 13 at a distance from the tool bar 17. The follower wheel 16 is positioned radially outward from the tool bar 17. During cutting, the follower wheel 16 abuts against the outer wall of the pipe 291 being machined. A blade is mounted on the tool bar 17.

[0073] In some embodiments, the tool holder assembly may only include a follower wheel 16 and a tool rod 17. In this case, the follower wheel 16 and the tool rod 17 do not need to be installed on the tool holder 13, that is, the follower wheel 16 and the tool rod 17 can be directly set on the cutter disc 242 at a certain distance, and the follower wheel 16 is set on the radial outside of the tool rod 17.

[0074] The distance between the follower wheel 16 and the cutter bar 17 determines the size of the internal boring groove. In other embodiments, the distance between the follower wheel 16 and the cutter bar 17 is adjustable. A groove is provided on the tool holder 13 at the position where the cutter bar 17 is fixed, and a screw hole is provided on the radial outer wall of the groove. After the cutter bar 17 is placed in the groove, it can be fixed to the tool holder 13 by a clamping screw. The distance between the follower wheel 16 and the cutter bar 17 can be adjusted by replacing cutter bars 17 of different sizes, or by adjusting the screw. In some embodiments, an adjustment shim is provided between the cutter bar 17 and the clamping screw. In this case, the distance between the follower wheel 16 and the cutter bar 17 can be adjusted by adding or removing the adjustment shim.

[0075] According to some embodiments of the present invention, the working process of the above-mentioned beveling machine is as follows: before the beveling machine works, the first push rod 9 and the second push rod 1 of the tensioning mechanism 230 are extended to tighten and clamp the inner wall 291 of the pipe to be processed, and the follower wheel 16 of the cutting mechanism 240 is pressed against the outer wall of the pipe to be processed, and the cutting tip of the blade on the tool rod 17 is placed at the lower part of the inner wall side of the center of the wall thickness of the end face of the pipe mouth of the pipe to be processed 290. After the beveling machine is started, the cutter disc 242 drives the tool holder assembly 241 to rotate to perform bevel cutting on the end face of the pipe to be processed 290.

[0076] In some embodiments, the length of the cutter bar 17 or the extension length of the cutter bar 17 relative to the tool holder 13 is adjustable. When the beveling machine is used for internal boring, the length of the cutter bar 17 or the extension length of the cutter bar 17 on the tool holder 13 can be adjusted according to the desired internal boring depth. In this case, the working process of the beveling machine is as follows: before the beveling machine is operated, the first push rod 9 and the second push rod 1 of the tensioning mechanism 230 are extended to tighten and clamp the inner wall 291 of the pipe to be processed. The follower wheel 16 of the cutting mechanism 240 is pressed against the outer wall of the pipe to be processed. By adjusting the length of the cutter bar 17 or the extension length of the cutter bar 17 on the tool holder 13, the blade on the cutter bar 17 is placed on the inner wall 291 of the pipe to be processed 290. After the beveling machine is started, the cutter head 242 drives the tool holder assembly 241 to rotate, performing internal boring and cutting on the pipe to be processed 290.

[0077] A beveling machine equipped with the tool holder assembly 241 and tensioning mechanism 230 provided in the above-described embodiment of the present invention is capable of internally boring curved pipes whose straight pipe sections are shorter than the minimum length required by existing beveling machines. However, the above-described embodiment does not necessarily require that the tool holder assembly 241 provided by the present invention and the tensioning mechanism 230 be assembled together in the same beveling machine. Alternatively, the tool holder assembly 241 provided by the present invention can also be used in existing beveling machines. For example, by replacing the tool holder assembly of an existing beveling machine with the tool holder assembly 241 provided by the present invention, internal boring of pipes can be achieved.

[0078] In the above-mentioned embodiment of the present invention, by improving the components such as the tool rod and the follower wheel in the tool holder assembly, the problem in the prior art that the internal boring processing depth of the groove machine cannot meet the technical requirements is solved. At the same time, the follower wheel for selecting the boring reference during internal boring is moved from the inner wall of the pipe to be processed to the outer wall of the pipe to be processed, thereby avoiding interference between the follower wheel and the push rod during the boring process. While improving the safety of the internal boring processing, the strength of the improved tool holder assembly is also further improved, thereby enhancing the stability of the groove machine during internal boring grooves.

[0079] The above embodiments are not exhaustive of specific implementation methods, and there may be other embodiments. The above embodiments are intended to illustrate the present invention rather than to limit the scope of protection of the present invention. All applications derived from simple variations of the present invention fall within the scope of protection of the present invention.

[0080] This patent specification uses examples to illustrate the invention, including the best mode, and to enable those skilled in the art to make and use the invention. The patentable scope of this invention includes the contents of the claims and the specific embodiments and other examples in the specification. These other examples should also fall within the scope of the patent claims of this invention as long as they contain technical features described in the same literal language as the claims, or they contain technical features described in similar literal language that are not substantially different from the claims.

[0081] The entire contents of all cited patents, patent applications and other references in this application should be incorporated into this application document by reference. However, if a term in this application conflicts with a term in an incorporated reference, the term in this application takes precedence.

[0082] It is important to note that the terms "first," "second," or similar expressions do not denote any order, quality, or importance; they are used only to distinguish between different technical characteristics. The modifier "about" used in conjunction with a quantity includes the stated value and the meaning dictated by the context (e.g., it includes the error in measuring the specified quantity).

Claims

1. A beveling machine, comprising a frame (210), a spindle (220), a tensioning mechanism (230) and a cutting mechanism (240), characterized in that: The frame (210) is connected to the main shaft (220), and the tensioning mechanism (230) and the cutting mechanism (240) are arranged on the main shaft (220); The tensioning mechanism (230) comprises: a first push rod (9), a second push rod (1), a first piston and a second piston, wherein the first piston comprises a first piston body (8) and a first piston cylinder (7); The first piston body (8) is fixed on the main shaft (220), the first piston body (8) is the cylinder of the second piston, and the second piston is arranged to overlap with the first piston; The first piston cylinder (7) is movably connected to the first push rod (9) to drive the first push rod (9), and the second piston is movably connected to the second push rod (1) to drive the second push rod (1).

2. The beveling machine according to claim 1, characterized in that: The second piston comprises a second piston body (5) and a second piston rod (3); the second piston rod (3) is fixedly connected to the second piston body (5) and movably connected to the second push rod (1); the second piston body (5) drives the second piston rod (3) and further drives the second push rod (1).

3. The beveling machine according to claim 2, characterized in that: The first piston further comprises a first cylinder cover (6), and the second piston further comprises a second cylinder cover (4); the first cylinder cover (6) is fixedly connected to the first piston cylinder barrel (7), serving as a cylinder cover of the piston cylinder corresponding to the first piston; the second cylinder cover (4) is fixedly connected to the first piston body (8), serving as a cylinder cover of the piston cylinder corresponding to the second piston.

4. The beveling machine according to claim 3, characterized in that: The second piston body (5) moves in a space formed by the main shaft (220) and the first piston body (8); and the first piston cylinder (7) moves on the first piston body (8).

5. The beveling machine according to claim 4, characterized in that: The first piston cylinder (7) and the second piston body (5) move in the axial direction.

6. The beveling machine according to claim 5, characterized in that: The first piston body (8) is fixed to the main shaft (220) in a manner including bolt connection, riveting and welding; The fixing connection between the first cylinder cover (6) and the first piston cylinder (7) includes bolt connection, riveting and welding; the fixing connection between the second cylinder cover (4) and the first piston body (8) includes bolt connection, riveting and welding; The first piston cylinder (7) and the first push rod (9) are movably connected via a hinge; the second piston rod (3) and the second push rod (1) are movably connected via a hinge; the second piston rod (3) and the second piston body (5) are connected in the following ways: threaded connection, bolt connection, welding, snap connection and riveting.

7. The beveling machine according to any one of claims 2 to 6, characterized in that: When the beveling machine is working, the first piston cylinder (7) moves to drive the first push rod (9) to extend radially, and the second piston body (5) moves to drive the second push rod (1) to extend radially, thereby clamping the inner wall of the pipe to be processed; After the beveling machine finishes working, the first piston cylinder (7) moves to drive the first push rod (9) to retract radially, and the second piston body (5) moves to drive the second push rod (1) to retract radially, thereby releasing the clamping of the pipe to be processed.

8. The beveling machine according to any one of claims 2 to 6, characterized in that: The driving forces of the first piston and the second piston are independent of each other, that is, the movement of the first piston cylinder (7) and the movement of the second piston body (5) are independent of each other.

9. The beveling machine according to any one of claims 1 to 6, characterized in that: The cutting mechanism (240) includes a cutter disc (242) and a cutter head assembly (241) disposed on the cutter disc (242); The tool holder assembly (241) includes a tool rod (17) and a follower wheel (16) arranged in the axial direction, wherein the tool rod (17) is provided with a blade, the follower wheel (16) is spaced a certain distance from the tool rod (17), and the follower wheel (16) is arranged radially outside the tool rod (17). During the cutting process, the follower wheel (16) abuts against the outer wall of the pipe to be processed.

10. The beveling machine according to claim 9, characterized in that: The tool holder assembly (241) further includes a tool holder (13) mounted on the tool disc (242), and the tool rod (17) and the follower wheel (16) are fixed on the tool holder (13).

11. The beveling machine according to claim 9, characterized in that: The distance between the follower wheel (16) and the knife rod (17) is adjustable.

12. The beveling machine according to claim 10, characterized in that: A groove is provided on the tool holder (13) at a position where the tool rod (17) is fixed, and a screw hole is provided on the radial outer wall of the groove. After the tool rod (17) is placed in the groove, it is fixed to the tool holder (13) by screws. The distance between the follower wheel (16) and the tool rod (17) can be adjusted by replacing a tool rod (17) of different sizes, adjusting screws, or adding or removing adjustment gaskets.

13. The beveling machine according to claim 9, characterized in that: The beveling machine is provided with multiple sets of tensioning mechanisms (230) and multiple sets of cutting mechanisms (240), and the multiple sets of tensioning mechanisms (230) are symmetrically arranged on the main shaft (220).

14. The beveling machine according to claim 9, characterized in that: The working process of the beveling machine is as follows: Before the beveling machine is operated, the first push rod (9) and the second push rod (1) of the tensioning mechanism (230) are extended to tighten and clamp the inner wall of the pipe to be processed, the follower wheel (16) of the cutting mechanism (240) is pressed against the outer wall of the pipe to be processed, and the cutting tip of the blade is placed at the lower part of the inner wall side of the center of the wall thickness of the pipe end face of the pipe to be processed; After the beveling machine is started, the cutter head (242) drives the tool holder assembly (241) to rotate, and performs beveling cutting on the pipe to be processed.

15. The beveling machine according to claim 10, characterized in that: The length of the tool rod (17) is adjustable. When the groove machine is used for internal boring, the length of the tool rod (17) or the extension length of the tool rod (17) on the tool holder (13) can be adjusted according to the required internal boring depth.

16. The beveling machine according to claim 15, characterized in that: The working process of the beveling machine is as follows: Before the beveling machine is operated, the first push rod (9) and the second push rod (1) of the tensioning mechanism (230) are extended to tighten and clamp the inner wall of the pipe to be processed, and the follower wheel (16) of the cutting mechanism (240) is pressed against the outer wall of the pipe to be processed. By adjusting the length of the tool rod (17) or adjusting the extension length of the tool rod (17) on the tool holder (13), the blade is placed on the inner wall of the pipe to be processed; After the groove machine is started, the cutter head (242) drives the tool holder assembly (241) to rotate, and performs internal boring and cutting on the pipe to be processed.

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