Pipeline cutting machine and cutting method thereof

Abstract

The invention relates to the field of metal cutting, in particular to a pipeline cutting machine and a cutting method thereof. A pipeline cutting machine comprises a rotating tool rest, two sliding grooves are oppositely formed in the rotating tool rest, each sliding groove is connected with a tool apron in a sliding mode, cutting tools are fixed to the tool aprons, and the opposite ends of the two cutting tools are the cutting ends of the cutting tools. The pipeline cutting method comprises the steps that S1, a pipeline penetrates through the rotary tool rest; s2, a cutting knife is mounted on each of two knife holders on the rotary knife rest; s3, the left end of the pipeline abuts against the first cone, and the right end of the pipeline abuts against the second cone; s4, two V-shaped pieces on the first cone are driven to clamp the left end of the pipeline; s5, the first cone and the second cone are driven to move left and right, and the cutting position of the pipeline is aligned with the two cutters; and S6, the rotating tool rest is driven to rotate to drive the two cutting tools to rotate, the two cutting tools approach each other while rotating, and the pipeline is cut.

Description

Technical Field

[0001] The present invention relates to the field of metal cutting, and more specifically to a pipe cutting machine and a cutting method thereof. Background Art

[0002] In the field of pipe processing, the performance of the pipe cutting machine directly affects the processing efficiency and quality. At present, there are various types of pipe cutting machines on the market, which to a certain extent meet the needs of different users for pipe cutting. However, the existing pipe cutting machines generally have a significant technical defect, that is, the rotating tool rest structure is not provided. In the traditional design of pipe cutting machines, the cutting tool usually adopts a fixed position or only a linear motion method to realize the pipe cutting operation. This design makes the cutting tool only able to cut into the pipe from one side during the cutting process and cut along a fixed direction. This results in low cutting efficiency, and for some pipes with a large diameter or a thick wall, the cutting difficulty increases significantly. Summary of the Invention

[0003] To overcome the deficiencies of the prior art, the present invention provides a pipe cutting machine and a cutting method thereof, and the beneficial effect is that a rotating tool rest is provided, and the cutting tool can be driven by the rotating tool rest to rotate in a circular trajectory for pipe cutting operation, so as to improve the cutting efficiency.

[0004] A pipe cutting machine includes a rotating tool rest, two sliding grooves are oppositely arranged on the rotating tool rest, a tool holder is slidably connected to each sliding groove, a cutting tool is fixed on the tool holder, and the opposite ends of the two cutting tools are the cutting ends of the cutting tools.

[0005] A hole corresponding to the cutting tool is provided on the tool holder, the cutting tool is inserted into the tool holder with a clearance fit, and a fastening screw is threadedly connected to the tool holder, and the fastening screw presses on the cutting tool.

[0006] A side rod is fixed in the middle of the rotating tool rest, a slider is slidably connected to the side rod, two connecting rods are hinged to the slider, the other ends of the two connecting rods are respectively hinged to the two tool holders, and a first telescopic rod is fixed on the side rod, and the movable end of the first telescopic rod is fixed to the slider.

[0007] A cylinder is fixed on the right side of the rotating tool rest, a bearing is sleeved on the outside of the cylinder, a collar is sleeved on the outer ring of the bearing, a support rod is fixed at the lower end of the collar, two stop pins are fixed on the cylinder, the two stop pins respectively block both sides of the collar, and a support rod is fixed at the lower end of the collar.

[0008] A method for a pipe cutting machine to perform pipe cutting includes the following steps: S1: Pass the pipe through the rotating tool rest; S2: Install a cutting tool on each of the two tool holders on the rotating tool rest; S3: Press the left end of the pipe against Cone 1 and the right end of the pipe against Cone 2; S4: Drive the two V-shaped pieces on Cone 1 to clamp the left end of the pipe; S5: Drive Cone 1 and Cone 2 to move left and right to align the cutting position of the pipe with the two cutting tools; S6: Drive the rotary tool rest to rotate to drive the two cutting tools to rotate. While rotating, the two cutting tools move closer to each other to cut the pipe. Description of the Drawings

[0009] The present invention will be further described in detail below with reference to the drawings and specific implementation methods.

[0010] Figure 1 Structural schematic of a pipe cutting machine Figure 1 ; Figure 2 Structural schematic of a pipe cutting machine Figure 2 ; Figure 3 Structural schematic of a pipe cutting machine Figure 3 ; Figure 4 Structural schematic of a pipe cutting machine Figure 4 ; Figure 5 Structural schematic of the rotary tool rest Figure 1 ; Figure 6 Structural schematic of the rotary tool rest Figure 2 ; Figure 7 Structural schematic of the cylinder Figure 1 ; Figure 8 Structural schematic of the cylinder Figure 2 ; Figure 9 Structural schematic of the base; Figure 10 Structural schematic of Vertical Strip 1 and Vertical Strip 2.

[0011] In the figure: Rotary tool rest 101; Connecting rod 102; Slide block 103; Telescopic rod 1 104; Side rod 105; Tool holder 106; Cutting tool 107; Fastening screw 108; Slide groove 109; Cylinder 201; Stop pin 202; Motor 203; Gear 204; Tooth ring 205; Support rod 206; Collar 207; Base 301; Telescopic rod 2 302; Track 303; Vertical Strip 1 401; Cone 1 402; L-shaped frame 403; Slide rod 404; Telescopic rod 3 405; V-shaped piece 406; Telescopic rod 4 407; T-shaped part 408; Guide rod 409; Vertical bar two 501; screw 502; rotating head 503; mating block 504; cone two 505. Specific implementation mode

[0012] As Figure 5-6 shown; As shown; since the pipe cutting machine includes a rotating tool rest 101, two sliding grooves 109 are oppositely arranged on the rotating tool rest 101, a tool holder 106 is slidably connected to each sliding groove 109, a cutting tool 107 is fixedly pressed on the tool holder 106 by screws. The screws used to press the cutting tool 107 are selected from stainless steel or alloy materials, which have higher shear and tensile strength, can withstand greater cutting force, and are not easily deformed or loosened during the cutting process. The thread shape of fine thread is adopted to increase the friction and self-locking performance of the thread, preventing the screws from loosening by themselves under the action of vibration or cutting force. The installation surfaces of the tool holder 106 and the cutting tool 107 are precisely machined to improve the matching accuracy between the two, ensure close and uniform contact, reduce the gap, enable the cutting force to be more effectively transmitted to the tool holder 106, and prevent the cutting tool 107 from displacing on the tool holder 106. The opposite ends of the two cutting tools 107 are the cutting ends of the cutting tool 107. Both tool holders 106 can slide radially on the corresponding sliding grooves 109, thereby adjusting the distance between the two cutting tools 107. The pipe is passed through the rotating tool rest 101, the rotating tool rest 101 is driven to rotate, and while the rotating tool rest 101 is rotating, the two tool holders 106 are driven to slide closer to each other, thereby driving the two cutting tools 107 to approach each other, so that the two cutting tools 107 contact the outer wall of the pipe. The pipe is cut by the continuous rotation and cutting of the two cutting tools 107. The two cutting tools 107 are driven by the rotating tool rest 101 to rotate in a circular track for pipe cutting operation, improving the cutting efficiency.

[0013] As Figure 5-6 shown; As shown; since the tool holder 106 is provided with a hole corresponding to the cutting tool 107, the cutting tool 107 is inserted into the tool holder 106 with a clearance fit, and a fastening screw 108 is threadedly connected to the tool holder 106, and the fastening screw 108 presses on the cutting tool 107. The fastening screw 108 can press on the cutting tool 107, thereby fixing the cutting tool 107 on the tool holder 106. After loosening the fastening screw 108, the cutting tool 107 can be removed from the tool holder 106, thereby facilitating the replacement of the cutting tool 107.

[0014] Furthermore, in a preferred embodiment, to further enhance the stability of the cutting process, a tool cap can be added to the tool holder 106. The tool cap is firmly installed on the tool holder 106 by means of bolt connection. Threaded holes are pre-set at corresponding positions on the tool holder 106, and corresponding perforations are also provided on the tool cap. By passing bolts through the perforations of the tool cap in sequence and screwing them into the threaded holes of the tool holder 106, a tight connection between the two is achieved. The non-cutting end of the cutting tool 107 is accurately positioned in a specific accommodation space inside the tool cap. During the cutting operation, the tool is subjected to cutting forces, and the presence of the tool cap can effectively prevent the cutting tool 107 from moving reversely due to the force, thus ensuring the accuracy and stability of the cutting process and improving the machining quality and efficiency.

[0015] The tool cap can be set to a cylindrical shape. After it is connected to the tool holder 106, it can provide comprehensive and uniform wrapping support for the non-cutting end of the cutting tool 107, effectively preventing the cutting tool 107 from wobbling due to uneven force during the cutting process, thereby improving the cutting accuracy.

[0016] The tool cap can also be set to a conical shape. This shape helps to guide the chips generated by cutting to be discharged smoothly, avoiding chip accumulation from affecting the cutting effect. During the cutting operation, the conical surface can change the movement trajectory of the chips, making them slide along the conical surface, reducing the interference of the chips on the cutting tool 107 and the workpiece, ensuring the smoothness of the cutting process, and improving the machining efficiency.

[0017] As Figure 5-6 shown; Since a side rod 105 is connected to the middle of the rotary tool rest 101 by bolts, a slider 103 is slidably connected to the side rod 105, two connecting rods 102 are hinged to the slider 103, the other ends of the two connecting rods 102 are respectively hinged to two tool holders 106, a first telescopic rod 104 is connected to the side rod 105 by a flange, and the movable end of the first telescopic rod 104 is connected to the slider 103 by a flange. When the first telescopic rod 104 expands and contracts, it drives the slider 103 to slide back and forth on the side rod 105. When the slider 103 slides, it simultaneously drives the two tool holders 106 to move equidistantly through the two connecting rods 102, so that the two tool holders 106 and the two cutting tools 107 approach or move away from each other synchronously. While the rotary tool rest 101 rotates, it drives the two cutting tools 107 to continuously approach each other, thereby driving the two cutting tools 107 to cut the outer wall of the pipeline layer by layer until the pipeline is cut off, improving the cutting efficiency. The first telescopic rod 104 is an electric telescopic rod, and the first telescopic rod 104 is driven by a battery. The battery is arranged on the outer wall of the rotary tool rest 101. The purpose of this is that the first telescopic rod 104 does not need to be connected to the wires outside the pipe cutting machine, effectively avoiding the risk of the wires being repeatedly wound and pulled by the rotary tool rest 101 and breaking, reducing the incidence of equipment failures, extending the overall service life of the equipment, and reducing the maintenance frequency and cost. Without the restraint of wires, the rotary tool rest can rotate more freely by 360 degrees, and can adapt to the pipeline cutting requirements of various complex angles and spatial positions during pipe cutting operations, expanding the application scenarios of the equipment.

[0018] As Figure 5-8 shown; Since a cylinder 201 is welded to the right side of the rotary tool rest 101, a bearing is sleeved outside the cylinder 201, a collar 207 is sleeved on the outer ring of the bearing, a support rod 206 is welded to the lower end of the collar 207, two stop pins 202 are inserted into the cylinder 201, and the two stop pins 202 are respectively blocked on both sides of the collar 207. The cylinder 201 can rotate around its own axis on the collar 207 through the bearing, thereby enabling the rotary tool rest 101 to rotate around its own axis, and further driving the two tool holders 106 and the two cutting tools 107 to rotate around the axis of the rotary tool rest 101, realizing driving the two cutting tools 107 to rotate and cut along a circular track. The two stop pins 202 are respectively blocked on both sides of the collar 207 to prevent the cylinder 201 from moving left and right relative to the collar 207 randomly.

[0019] As Figure 7-8 shown; Since a toothed ring 205 is connected to the outer side of the right end of the cylinder 201 by a key, a motor 203 is connected to the upper end of the collar 207 by bolts, a gear 204 is connected to the output shaft of the motor 203 by a key, the gear 204 meshes with the toothed ring 205 for transmission, the motor 203 drives the gear 204 to rotate, the rotation of the gear 204 drives the toothed ring 205 to rotate, and further drives the cylinder 201 to rotate around its own axis on the collar 207.

[0020] As Figure 7-10 shown; Since the lower end of the support rod 206 is connected to the middle of the base 301 by bolts, a track 303 is provided on the base 301, the lower end of the first vertical strip 401 is slidably connected to the left part of the track 303, the left part of the base 301 is connected to the second telescopic rod 302 by a flange, the movable end of the second telescopic rod 302 is connected to the lower end of the first vertical strip 401 by a flange, two L-shaped frames 403 arranged vertically are connected to the upper part of the first vertical strip 401 by bolts, a sliding rod 404 is slidably connected to each L-shaped frame 403, V-shaped pieces 406 are welded to the opposite ends of the two sliding rods 404, a third telescopic rod 405 is connected to each L-shaped frame 403 by a flange, and the movable end of the third telescopic rod 405 is connected to the corresponding V-shaped piece 406 by a flange. A first cone 402 is connected to the upper part of the first vertical strip 401 by bolts. The first cone 402 is located between the two V-shaped pieces 406. The first cone 402 is coaxially arranged with the rotary tool holder 101. The left end of the pipe is inserted onto the first cone 402. The first cone 402 can be used for pipes with different inner diameters. The first cone 402 can be inserted onto pipes with different inner diameters. Then, the two third telescopic rods 405 drive the two sliding rods 404 to slide on the two L-shaped frames 403 respectively, thereby driving the two V-shaped pieces 406 to slide closer to each other. The two V-shaped pieces 406 clamp the left end of the pipe, and at the same time press the left end of the pipe onto the first cone 402, so that the pipe is centered and fixed on the first cone 402, and further the pipe is centered and passes through the rotary tool holder 101, facilitating the rotation of the two cutting tools 107 to cut the pipe. Due to the provision of the two V-shaped pieces 406, when the pipe is cut, the pipe is divided into two parts. The left-side pipe will be tightly clamped by the two V-shaped pieces 406 to prevent it from falling and breaking, especially for fragile ceramic pipes, and at the same time prevent larger pipes from falling and damaging the equipment. Similarly, a set of L-shaped frames 403, sliding rods 404, third telescopic rods 405 and V-shaped pieces 406 can be respectively provided at the upper and lower ends of the second cone 505. After the pipe is cut, the right-side pipe will be tightly clamped by the two right-side V-shaped pieces 406, and can cooperate with the second cone 505 to prevent the pipe from falling and breaking.

[0021] As Figure 9-10 shown; Since two guide rods 409 are welded to the lower right side of the vertical bar 401, a mating block 504 is slidably connected to the right ends of the two guide rods 409. The mating block 504 is bolted to the right side of the vertical bar 501. The lower end of the vertical bar 501 is slidably connected to the track 303. A second cone 505 is provided at the upper part of the vertical bar 501. The second cone 505 is disposed opposite to the first cone 402. A T-shaped member 408 is welded between the right ends of the two guide rods 409. A fourth telescopic rod 407 is flange-connected to the T-shaped member 408. The end of the fourth telescopic rod 407 is flange-connected to the vertical bar 501. When the fourth telescopic rod 407 expands and contracts, it drives the mating block 504 to move left and right on the two guide rods 409, thereby adjusting the distance between the vertical bar 501 and the vertical bar 401, and further adjusting the distance between the first cone 402 and the second cone 505, so that the first cone 402 and the second cone 505 are respectively inserted into both ends of the pipeline to stably center and support the pipeline. When the pipeline to be cut is long, the distance between the vertical bar 501 and the vertical bar 401 is adjusted to be larger. When the pipeline to be cut is short, the distance between the vertical bar 501 and the vertical bar 401 is adjusted to be smaller, which is convenient for cutting pipelines of different lengths.

[0022] Further, in a preferred embodiment, a layer of rubber is covered on the outer surfaces of the second cone 505 and the first cone 402. When the two are blocked at both ends of the pipeline, the pipeline will be sealed. The first cone 402 can be provided with a through-hole in the middle. Gas is input into the hole through an air pump. When a crack is about to be cut out on the pipeline, the high-pressure gas will spray out from the crack at a high speed, which can achieve rapid cooling of the cut. The high-pressure gas spraying out at a high speed can blow away impurities such as metal chips and powders generated during the cutting process from the cut, avoiding the residue of impurities adhering to the surface of the cut, affecting the quality of the cut and subsequent processing, and being beneficial to keeping the cut clean and flat.

[0023] The spraying of the high-pressure gas can form a protective gas film on the surface of the cut, reducing the contact between the metal at the cut and the air, thereby reducing the degree of oxidation of the cut at high temperature, helping to improve the corrosion resistance and oxidation resistance of the metal at the cut, and maintaining the good performance of the cut.

[0024] When a crack is about to be cut out on the pipeline, the impact force of the high-pressure gas can have a certain expanding and pushing effect on the crack, assisting the pipeline to break along the crack to a certain extent during the pipe cutting process, making the pipe cutting process smoother. Especially for some thicker or harder pipelines, it can play a certain assisting role, reducing the burden on the cutting tool and prolonging the service life of the tool.

[0025] In pipeline cutting operations, the traditional cooling method usually sprays coolant or gas from the outside of the pipeline to the cutting tool. This conventional method has many obvious defects, which is in sharp contrast to the unique internal ventilation cooling method of the first cone 402. In terms of the cooling coverage, it is very difficult for the traditional external spraying method to ensure that the coolant or gas can act evenly and deeply on all parts of the cut. Especially when cutting pipes with a large diameter or complex structure, the areas inside the pipe far from the spraying nozzle often cannot be cooled sufficiently. For example, when cutting large-diameter industrial oil pipelines, the traditional cooling method can often only cool the area near the outer wall of the pipe, and the temperature at the inner wall cut of the pipe remains high, which greatly affects the overall cut quality. However, Cone-402 can accurately deliver high-pressure gas directly to the cut that is about to form through the internal air holes. Regardless of the pipe diameter and structure, it can ensure that every part of the cut can be efficiently cooled. In terms of maintaining the cut quality, the traditional cooling method is difficult to effectively reduce the oxidation of metal at high temperatures. The externally sprayed coolant or gas cannot form a continuous and stable protective gas film on the cut surface. The high temperature generated during the cutting process causes a large amount of contact between the metal at the cut and the air, accelerating oxidation and seriously reducing the corrosion resistance and oxidation resistance of the metal at the cut. In the cutting of stainless steel pipes in the construction industry, the cut is prone to rusting after traditional cooling, affecting the service life of the pipe. The protective gas film formed by Cone-402 tightly wraps the cut, greatly reducing the contact between the metal and the air and significantly improving the performance of the metal at the cut. For the process of assisting in pipe cutting, the traditional cooling method is of no help. When facing thicker or harder pipes, the cutting tool bears a heavy burden and its service life is significantly shortened. However, the impact force of the high-pressure gas of Cone-402 can expand the crack, assist in pipe disconnection, reduce the burden on the tool, and extend the service life of the tool, demonstrating excellent pipe cutting assistance ability.

[0026] If the method of directly spraying coolant or gas into the pipe is adopted, in terms of the cooling effect, the uniformity and comprehensiveness of cooling can be greatly improved. Compared with spraying from the outside of the pipe, internal spraying can allow the coolant or gas to quickly diffuse in the internal space of the pipe and contact all parts being cut in all directions. Especially for pipes with a large diameter, it can ensure that the cut areas of the inner and outer walls of the pipe are effectively cooled at the same time. For example, in the cutting operation of large-diameter cast iron pipes for urban water supply, spraying coolant internally can quickly reduce the temperature of the entire cut, avoid material deformation caused by local overheating, and significantly improve the flatness and quality of the cut.

[0027] In terms of impurity cleaning, the coolant or gas injected internally can, relying on the relatively enclosed space environment inside the pipeline, more efficiently wash away and carry out the metal chips and powder impurities generated by cutting from the pipeline. Different from the dispersed direction during external injection, internal injection can utilize the internal space of the pipeline to guide the flow direction of the fluid, directly flush the impurities towards the open end of the pipeline for discharge, reducing the probability of impurities remaining at the incision. Taking the pipeline cutting in the chemical industry as an example, precise internal injection can ensure that there are no cutting impurities remaining in the pipeline, avoiding the pollution of the subsequent transported chemical substances by the impurities, and ensuring the safety and stability of chemical production. From the perspective of maintaining the incision quality, the coolant or gas injected internally can form a more effective protective layer on the incision surface. The coolant can form a water film on the metal surface of the incision, isolating the air and reducing the metal oxidation rate; while gas injection can form a protective gas film like the high-pressure gas in the cone - 402, reducing the contact between the metal and oxygen. In the cutting of titanium alloy pipelines in the aerospace field, injecting protective gas internally can effectively prevent the titanium alloy from reacting with air at high temperatures, ensuring that the properties such as high strength and corrosion resistance of the metal at the incision are not affected, meeting the stringent requirements of aerospace components for material properties. During the process of assisting in pipe cutting, when injecting coolant or gas with a certain pressure into the pipeline, as the cutting progresses, the part of the pipeline about to be disconnected is affected by the internal fluid pressure, which can produce an expansion and pushing effect on the crack similar to the high-pressure gas in the cone - 402. For some thicker or more ductile pipelines, the internal fluid pressure assists in the crack expansion, making the pipe cutting process smoother, reducing the load on the cutting tool, extending the tool life, and improving the overall efficiency of the pipeline cutting operation.

[0028] Furthermore, in a preferred embodiment, during pipeline cutting operations, reasonably selecting the type of gas injected into the pipeline according to the different pipeline materials can significantly improve the cutting effect. For aluminum pipes, nitrogen is an ideal injection gas. Aluminum has relatively active chemical properties and is extremely prone to reacting with oxygen to form aluminum oxide during high-temperature cutting, affecting the incision quality and the performance of aluminum pipes. Nitrogen has stable chemical properties. Injecting nitrogen can form a tight protective gas film on the incision surface, effectively isolating oxygen and greatly reducing the formation of aluminum oxide. When cutting aluminum pipes commonly used in electronic device manufacturing, nitrogen injection can ensure that the properties such as the electrical conductivity of aluminum at the incision are not affected, the incision surface is smooth, avoiding resistance changes caused by the oxide layer, and meeting the high-precision requirements of electronic components for the connection parts of aluminum pipes. At the same time, the rapid cooling effect of nitrogen can quickly reduce the incision temperature, prevent the aluminum pipe from deforming due to local overheating, improve the cutting accuracy, and reduce the scrap rate. When cutting copper pipes, argon is an excellent choice. Copper is easily oxidized at high temperatures to form oxides such as copper oxide, which not only reduces the electrical conductivity of copper but also affects the appearance and corrosion resistance of copper pipes. As an inert gas, argon can provide reliable protection for the cut of the copper pipe during the cutting process, preventing oxygen from contacting the copper and maintaining the excellent properties of copper. In the cutting of copper pipes in the field of power transmission, argon injection can ensure the stable electrical conductivity of the copper at the cut, avoid the increase in resistance caused by oxidation, and ensure the high efficiency of power transmission. Moreover, the high-speed injection of argon can effectively blow away the copper chips generated during cutting, prevent the copper chips from accumulating and sticking at the cut, keep the cut clean and flat, and is conducive to subsequent welding or connection processes of copper pipes. When cutting steel pipes, carbon dioxide gas has unique advantages. Steel is mainly composed of elements such as iron and carbon. During the cutting process, high temperatures can easily cause iron to oxidize and rust. Carbon dioxide gas can, to a certain extent, inhibit the oxidation of iron. At the same time, its relatively high density can better fill the internal space of the pipe to achieve uniform cooling. In the cutting of steel pipes used in building structures, carbon dioxide injection can reduce the degree of oxidation of the steel at the cut, improve the corrosion resistance of the cut, and extend the service life of the steel pipe in outdoor environments. In addition, carbon dioxide gas has a certain pressure. In terms of assisting in pipe cutting, it can have an obvious expanding effect on the cracks of thicker steel pipes, help the steel pipe break along the cracks, reduce the wear of the cutting tool, improve the cutting efficiency, and reduce the construction cost.

[0029] Furthermore, in a preferred embodiment, a set of L-shaped frames 403, sliding rods 404, telescopic rods three 405, and V-shaped pieces 406 are also respectively arranged at the upper and lower ends of the second cone 505. After the pipe is cut off, the pipe on the right side will be tightly clamped by the two V-shaped pieces 406 on the right side, and can cooperate with the second cone 505 to prevent the pipe from falling and being damaged.

[0030] As Figure 10 shown; Since the upper part of the second vertical strip 501 is connected by a thread to a horizontally arranged screw rod 502, a rotating head 503 is fixed to the right end of the screw rod 502, and the second cone 505 is fixed to the left end of the screw rod 502. By rotating the rotating head 503, the screw rod 502 can be driven to rotate on the second vertical strip 501 through the thread, and then drive the screw rod 502 and the second cone 505 to move left and right relative to the second vertical strip 501, thereby slightly adjusting the distance between the first cone 402 and the second cone 505. When fine-tuning the distance between the first cone 402 and the second cone 505 is required, it can be achieved by rotating the screw rod 502, and the operation is more convenient; at the same time, rotating the screw rod 502 can drive the second cone 505 to move to the left, so that the first cone 402 and the second cone 505 can press on the left and right ends of the pipe, applying a certain pressure in the left and right directions to the pipe to prevent the pipe from shaking when stressed during cutting.

[0031] In the pipe cutting machine, the design of connecting the upper part of the vertical bar 501 and the screw 502 by threads has many delicate considerations. From the overall structure, the screw 502 is horizontally arranged, with a rotary head 503 fixed at its right end and a second cone 505 connected to its left end. This layout enables the operator to conveniently adjust the position of the second cone 505 by rotating the rotary head 503 on one side of the equipment. Compared with setting the adjustment device inside the equipment or in a difficult-to-reach position, this external and intuitive operation design greatly improves the operation convenience. The staff does not need to use additional tools to reach deep inside the equipment for complex operations, and simply rotating the rotary head can complete the spacing adjustment.

[0032] During the design process, various potential problems are avoided. For example, in terms of movement interference, when adjusting the spacing of the pipe support components in traditional cutting machines, due to unreasonable structural design, the adjustment mechanism often interferes with other components such as the transmission device and the pipe conveying mechanism. For some early cutting machines, chain drive is used to adjust the spacing of the support points. During operation, the chain is prone to scratching with the surrounding protective structure and lubrication pipeline, which not only affects the normal operation of the equipment but also poses risks such as chain breakage and component damage. In this design, by independently setting the screw adjustment structure outside the upper part of the vertical bar 501, it cleverly avoids interference with the rotating components of the rotary tool holder 101 and other moving components such as the telescopic rod, ensuring that each component does not interfere with each other during operation and works stably.

[0033] Regarding the problem of inserting long pipes, in conventional settings, if the spacing of the support points cannot be adjusted flexibly and accurately, when inserting a long pipe, it is difficult to ensure that the pipe is always centered and stable. Some traditional cutting machines use support blocks with fixed spacing. For pipes with large length variations, either they cannot support the too-long pipes, resulting in the middle part of the pipe sagging and affecting the cutting accuracy; or when cutting shorter pipes, the spacing of the support blocks is too large, and the pipe is prone to shaking during cutting. In this design, by adjusting the spacing between the second cone 505 and the first cone 402 with the screw 502, it can easily adapt to pipes of different lengths. Whether it is an industrial gas transmission pipe several meters long or a shorter household water supply pipe, the spacing can be accurately adjusted to keep the pipe stable during cutting, avoiding adverse effects on the cutting quality caused by pipe shaking or sagging.

[0034] Compared with some patented technologies, such as the "Optical Fiber Laser Pipe Cutting Machine Connected with a Lifting Arm" with the authorized announcement number CN222679825U, its main innovation lies in adjusting the position of the optical fiber laser cutting machine through the lifting arm and related structures to improve the pipe cutting efficiency and accuracy. However, in terms of pipe support and spacing adjustment, it does not involve the technical solution in this design that, for pipes of different lengths, ensures stable pipe support through a simple and precise thread adjustment structure. Another example is the "Steel Pipe Cutting Machine" with the authorized announcement number CN222725583U, which focuses on the design of aspects such as the steel pipe fixing and rotating mechanism. It also does not adopt the simple and effective thread adjustment method in this design to flexibly adjust the support spacing when dealing with the change in pipe length. This design solution shows different innovation and practicality from conventional designs in solving practical problems such as motion interference and adapting to the insertion of long pipes, providing a strong guarantee for improving the cutting quality and application range of the pipe cutting machine.

[0035] A pipe cutting machine and a method for cutting pipes, comprising the following steps: S1: Pass the pipe through the rotating tool holder 101; S2: Install a cutting tool 107 on each of the two tool seats 106 on the rotating tool holder 101; S3: Press the left end of the pipe against the first cone 402 and the right end of the pipe against the second cone 505; S4: Drive the two V-shaped pieces 406 on the first cone 402 to clamp the left end of the pipe; S5: Drive the first cone 402 and the second cone 505 to move left and right to align the cutting position of the pipe with the two cutting tools 107; S6: Drive the rotating tool holder 101 to rotate to drive the two cutting tools 107 to rotate, and the two cutting tools 107 approach each other while rotating to cut the pipe.

[0036] Furthermore, in a preferred embodiment, when cutting an aluminum alloy pipe, due to the relatively soft texture of the aluminum alloy material, the phenomenon of sticking to the tool is likely to occur. In view of this characteristic, before cutting, the cutting edges of the cutting tools 107 are oiled to reduce the friction during the cutting process. When cutting an aluminum alloy pipe with a diameter of 80 mm, after adjusting the spacing between the two cutting tools 107, the pipe is inserted into the rotating tool holder 101. Start the pipe cutting machine, and the rotating tool holder 101 rotates at a relatively high speed of 80 revolutions per minute to quickly cut the pipe and reduce the adhesion time of the aluminum alloy on the cutting edge. The speed at which the two tool seats 106 slide inward is 0.3 mm per second. After cutting, check the cutting surface and find that the surface is smooth, without obvious aluminum sticking marks, and the cutting quality is good, which is suitable for the application of aluminum alloy pipes in fields with extremely high surface quality requirements such as aerospace component manufacturing.

[0037] Further, in a preferred embodiment, for the cutting of polyvinyl chloride plastic pipes, considering the thermal sensitivity of the plastic material, during the cutting process, an air-cooling method is adopted to cool the cutting part. When cutting a PVC pipe with a diameter of 150 mm, the rotation speed of the rotary tool holder 101 is set at 60 revolutions per minute, and the inward sliding speed of the two tool holders 106 is 0.2 mm per second. During the cutting process, the blower continuously blows air towards the cutting area to take away the heat generated by cutting, preventing the PVC pipe from deforming due to overheating. Finally, the PVC pipe is neatly cut, the cutting surface is flat, and there is no phenomenon of charred edges, meeting the cutting requirements of PVC pipes in the fields of building water supply and drainage and chemical transportation, etc.

[0038] Further, in a preferred embodiment, for a copper pipe with a diameter of 30 mm, it is fixed before cutting. First, adjust the pipe cutting machine to the appropriate position and place the copper pipe between the first cone 402 and the second cone 505. Due to the small diameter, the operator holds the rotating head 503 and slowly rotates it clockwise. The screw 502 rotates rightward on the second vertical bar 501 through the thread, driving the second cone 505 to gradually approach the first cone 402. When the first cone 402 and the second cone 505 gently touch the left and right ends of the copper pipe, continue to finely adjust the rotating head 503 so that the first cone 402 and the second cone 505 exert a pressure of about 5 N on the copper pipe. During the subsequent cutting process, the copper pipe is stable and does not show any jitter. The cut pipe orifice is neat, meeting the high-precision cutting requirements of the copper pipe connection part in electronic equipment.

[0039] Further, in a preferred embodiment, when facing a steel pipe with a diameter of 250 mm, due to its large weight, higher requirements for fixing stability are needed. Initially, the distance between the first cone 402 and the second cone 505 is much larger than 250 mm. The operator uses a wrench to assist in rotating the rotating head 503, and the screw 502 rotates quickly, causing the second cone 505 to quickly approach the first cone 402. When the second cone 505 approaches the steel pipe, switch to manually rotating the rotating head 503 slowly. To ensure that the steel pipe is firmly fixed, make the first cone 402 and the second cone 505 exert a pressure of about 50 N on the steel pipe. During the cutting process, the steel pipe does not undergo displacement or jitter, and the cutting work is successfully completed. The flatness of the cutting surface meets the quality standards of steel pipes for building structures.

[0040] Furthermore, in a preferred embodiment, when cutting a ceramic pipeline, due to its high brittleness, it is prone to cracking during the fixing and cutting processes. For a ceramic pipeline with a diameter of 80 mm, more caution is required during fixing. The operator gently rotates the rotating head 503 to slowly bring the second cone 505 closer to the first cone 402. After the first cone 402 and the second cone 505 come into contact with the ceramic pipeline, a professional pressure detection device is used to precisely control the pressure exerted by the first cone 402 and the second cone 505 on the ceramic pipeline to be approximately 2 N, which can not only ensure that the pipeline does not displace during cutting but also prevent the pipeline from cracking due to excessive pressure. During the cutting process, the ceramic pipeline is stable, and the cut pipe mouth has no cracks, meeting the usage requirements of the ceramic pipeline in the chemical corrosion-resistant conveying system.

[0041] Furthermore, in a preferred embodiment, for the fixing of a rubber pipeline, considering its flexible characteristics, the fixing method needs to be appropriately adjusted. Taking a rubber pipeline with a diameter of 150 mm as an example, the operator first adjusts the distance between the first cone 402 and the second cone 505 to be slightly greater than 150 mm, and then places the rubber pipeline between them. Rotate the rotating head 503 to bring the second cone 505 closer to the first cone 402. After the cone comes into contact with the rubber pipeline, apply a pressure of approximately 3 N. Since the rubber pipeline has a certain elasticity, during the cutting process, to prevent its elastic deformation from affecting the cutting accuracy, the operator continuously observes during the cutting process and, if necessary, fine-tunes the rotating head 503 to maintain the stability of the pressure exerted by the first cone 402 and the second cone 505 on the rubber pipeline. Finally, the rubber pipeline is successfully cut, and the shape of the cut pipe mouth is regular, meeting the application requirements of the rubber pipeline in fields such as shock absorption and fluid transportation.

[0042] Furthermore, in a preferred embodiment, in the pipeline installation project on the exterior wall of a building, the pipeline needs to be cut at high altitude. The operator fixes the pipe cutting machine on a special high-altitude operation platform, which is equipped with safety protection devices. For a galvanized steel pipe with a diameter of 100 mm, during high-altitude operation, the operator rotates the rotating head 503 through a remote control device. Due to the complex high-altitude operation environment, the operator needs to more carefully control the pressure exerted by the first cone 402 and the second cone 505 on the steel pipe. After multiple fine-tuning operations, the pressure exerted by the first cone 402 and the second cone 505 on the steel pipe is approximately 8 N to ensure the stability of the steel pipe during high-altitude cutting. After cutting is completed, the operator installs the cut steel pipe at the designated position on the exterior wall. The entire process is safe and efficient, demonstrating the practicality of this fixing method in special high-altitude scenarios.

Claims

1. A pipe cutting machine, comprising a rotating tool holder (101), characterized in that: The rotating tool holder (101) is provided with two slide grooves (109) opposite to each other, each slide groove (109) is slidably connected to a tool holder (106), a cutting tool (107) is fixed to the tool holder (106), and the opposite ends of the two cutting tools (107) are cutting ends of the cutting tools (107).

2. A pipe cutting machine according to claim 1, characterized in that: The tool holder (106) is provided with a hole corresponding to the cutting tool (107); the cutting tool (107) is inserted into the tool holder (106) with a clearance fit; a fastening screw (108) is threadedly connected to the tool holder (106); the fastening screw (108) is pressed onto the cutting tool (107).

3. A pipe cutting machine according to claim 2, characterized in that: A side rod (105) is fixed to the middle of the rotating tool holder (101), a slider (103) is slidably connected to the side rod (105), two connecting rods (102) are hinged to the slider (103), the other ends of the two connecting rods (102) are respectively hinged to two tool seats (106), a telescopic rod (104) is fixed to the side rod (105), and the movable end of the telescopic rod (104) is fixed to the slider (103).

4. A pipe cutting machine according to claim 3, characterized in that: A cylinder (201) is fixed to the right side of the rotating tool holder (101), a bearing is sleeved on the outer side of the cylinder (201), a collar (207) is sleeved on the outer ring of the bearing, a support rod (206) is fixed to the lower end of the collar (207), and two stop pins (202) are fixed to the cylinder (201), and the two stop pins (202) are respectively blocked on two sides of the collar (207).

5. A pipe cutting machine according to claim 4, characterized in that: A gear ring (205) is fixed on the outer side of the right end of the cylinder (201), a motor (203) is fixed on the upper end of the collar (207), a gear (204) is fixed on the output shaft of the motor (203), and the gear (204) and the gear ring (205) are meshed for transmission.

6. A pipe cutting machine according to claim 5, characterized in that: The lower end of the support rod (206) is fixed to the middle part of the base (301), a track (303) is arranged on the base (301), the lower end of the vertical bar (401) is slidably connected to the left part of the track (303), a telescopic rod (302) is fixed to the left part of the base (301), the movable end of the telescopic rod (302) is fixed to the lower end of the vertical bar (401), and two L-shaped frames (403) arranged vertically are fixed to the upper part of the vertical bar (401), each L-shaped frame (403) is slidably connected to a sliding rod (404), and V-shaped plates (406) are fixed to the opposite ends of the two sliding rods (404), and a telescopic rod (405) is fixed to each L-shaped frame (403), and the movable end of the telescopic rod (405) is fixed to the corresponding V-shaped plate (406).

7. A pipe cutting machine according to claim 6, characterized in that: A cone (402) is fixed to the upper portion of the vertical strip (401); the cone (402) is located between two V-shaped sheets (406); and the cone (402) is coaxially arranged with the rotating tool holder (101).

8. A pipe cutting machine according to claim 7, characterized in that: Two guide rods (409) are fixed on the right side of the lower part of the vertical bar (401), and the right ends of the two guide rods (409) are slidably connected to a matching block (504), which is fixed to the right side of the vertical bar (501). The lower end of the vertical bar (501) is slidably connected to the track (303), and the upper part of the vertical bar (501) is provided with a cone (505), which is arranged opposite to the cone (402). A T-shaped piece (408) is fixed between the right ends of the two guide rods (409), and a telescopic rod (407) is fixed on the T-shaped piece (408), and the end of the telescopic rod (407) is fixed to the vertical bar (501).

9. A pipe cutting machine according to claim 8, characterized in that: The upper part of the second vertical bar (501) is connected to a transversely arranged screw rod (502) through a threaded connection, a screw head (503) is fixed to the right end of the screw rod (502), and the second cone (505) is fixed to the left end of the screw rod (502).

10. A method for cutting a pipe using the pipe cutting machine according to claim 9, characterized in that: The following steps are involved: S1: passing the pipe through the rotating tool holder (101); S2: installing a cutting tool (107) on each of the two tool holders (106) on the rotating tool holder (101); S3: Place the left end of the pipe on cone 1 (402) and the right end of the pipe on cone 2 (505); S4: The two V-shaped pieces (406) on the driving cone 1 (402) are clamped on the left end of the pipe; S5: driving cone 1 (402) and cone 2 (505) to move left and right, aligning the cutting position of the pipe with the two cutting knives (107); S6: driving the rotating tool holder (101) to rotate and driving the two cutting knives (107) to rotate, and the two cutting knives (107) approach each other while rotating to cut the pipe.

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