Automatic beveling machine for double gun automatic welding of natural gas pipeline and method of using the same

Abstract

The application provides an automatic beveling machine for double-gun automatic welding of a natural gas pipeline and a use method thereof, and relates to a metal or non-metal pipe orifice end face shaping and beveling device, which comprises a center cylinder, the center cylinder is used for moving along the axis of the pipeline, a work slide rail group is arranged at one end of the center cylinder and is the same as the radial extension direction of the center cylinder, the work slide rail group can rotate relative to the center cylinder, a track slide block group is arranged on the work slide rail group and can slide along the extension direction of the work slide rail group, a cutter is arranged on the track slide block group, and an infeed shifting piece group is arranged. The application can realize the adaptation to the pipeline diameters within a certain range, one beveling machine can process the pipelines within a certain diameter range, the number of beveling machines of different types carried in the construction site of different pipeline diameters is reduced, and the carrying amount of spare parts of various specifications is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of metal or non-metal pipe orifice end face shaping processing and bevel processing equipment, in particular, it is related to the automatic beveling machine for natural gas pipeline double gun automatic welding and its use method. BACKGROUND

[0002] Liquid or gas in industry is transported by continuous pipeline, for example, oil and gas is transported by continuous large-diameter thick-wall pipeline. Pipeline transport distance is far, generally hundreds of kilometers or even thousands of kilometers, and continuous pipeline is assembled and connected by a section of pipeline. In order to ensure the quality of pipeline connection, some pipelines are opened in high-precision bevel and variable diameter at the assembly and connection site, and then assembled and connected. Because the transport pipeline spans a wide area, the terrain and topography are complex, especially the heavy machinery transfer is difficult in the terrain and topography conditions such as desert, hilly land and wetland, the existing heavy pipeline beveling equipment cannot reach or is difficult to transfer or cannot adapt to various pipeline inclination conditions, so that pipeline site processing bevel in adverse environment becomes a difficult task. The existing manual assembly cutting equipment is time-consuming in installation process, and the centering accuracy is limited, which is difficult to be popularized in a large area. SUMMARY

[0003] To solve the above problems, the present application provides an automatic beveling machine for natural gas pipeline double gun automatic welding, comprising: a center cylinder, the center cylinder is used to move along the axis of the pipeline; a work slide rail group is arranged at one end of the center cylinder, and the work slide rail group is the same as the radial extension direction of the center cylinder, the work slide rail group can rotate relative to the center cylinder; a track slide block group is arranged on the work slide rail group, and the track slide block group can slide along the extension direction of the work slide rail group, when the work slide rail group rotates, the track slide block group rotates synchronously, and the track slide block group and the work slide rail group remain relatively static, a cutter is arranged on the track slide block group; an infeed tab group is arranged on the center cylinder, and the infeed tab group is used to drive the track slide block group to move along the axis of the center cylinder when the track slide block group rotates one revolution.

[0004] Optionally, one end of the center cylinder is processed into a cylinder flange end, an inner ring and an outer ring are arranged on the cylinder flange end, the inner ring comprises an inner ring structure, an inner ring mounting hole for mounting a fastener and an inner ring ball surface for cooperating with a ball, the outer ring comprises an outer ring structure, an outer ring ball surface for cooperating with a ball and an outer ring gear surface, the inner ring ball surface and the outer ring gear surface are matched by ball rolling, so that the outer ring can rotate relative to the center cylinder, and the inner ring is fixedly connected to the center cylinder by the fastener.

[0005] Optionally, the work slide rail set comprises a slide rail structure, a contour spring and a limiting rod, one end of the slide rail structure is fixedly connected with the outer ring, the other end of the slide rail structure is provided with a threaded hole, the limiting rod is an adjusting screw rod and is threadedly connected with the threaded hole, one end of the slide rail structure abuts against one end of the contour spring, and the other end of the contour spring is used for abutting against the track slider set.

[0006] Optionally, the track slider set comprises a track slider, a tool slider and an infeed screw rod, the track slider set is clamped and held in a predetermined position of the work slide rail set by the limiting rod and the contour spring, the track slider is slidingly nested in a predetermined track of the slide rail structure and can slide along the extension direction of the slide rail structure, the tool slider is slidingly nested in the track slider and can slide along the central cylinder in the axial direction, one end of the tool slider is provided with an internal thread matched with the infeed screw rod, the other end of the tool slider is provided with a hole for mounting the tool, the infeed screw rod is threadedly connected in the tool slider, one end of the infeed screw rod is rotatably connected to the track slider, and the other end of the infeed screw rod is provided with a gear.

[0007] Optionally, the infeed knob set comprises an infeed knob seat and an infeed knob, the infeed knob seat is internally provided with a sliding groove for adjusting the extension length of the infeed knob, one end of the infeed knob seat is fixedly connected to the inner ring, and the radial extension direction of the infeed knob seat is the same as that of the inner ring, one end of the infeed knob is embedded in the sliding groove of the infeed knob seat, and the other end of the infeed knob is integrally formed as a tooth structure matched with the gear at the end of the infeed screw rod.

[0008] Optionally, the hydraulic motor is further provided, the hydraulic motor comprises a motor body and a motor gear, the central cylinder has a cylinder front section, the motor body is fixedly installed in the cylinder front section, an output shaft of the motor body penetrates through the cylinder front section and is provided with the motor gear, and the motor gear is engaged with the outer ring.

[0009] Optionally, the hydraulic oil cylinder is further provided, the hydraulic oil cylinder comprises an oil cylinder body, an oil cylinder piston rod and a friction block, the oil cylinder body is fixedly connected to the central cylinder, and the end of the oil cylinder piston rod in the oil cylinder body is provided with the friction block.

[0010] Optionally, the guide wheel set is further provided, the guide wheel set comprises a wheel set support frame and a roller, one end of the wheel set support frame is fixedly connected to the central cylinder, and the other end of the wheel set support frame is rotatably connected to the roller.

[0011] Optionally, the front section of the barrel is provided with a mounting hole for mounting the motor body, the center barrel further has a middle section and a rear section of the barrel, the middle section and the rear section of the barrel are provided with mounting holes for mounting the hydraulic cylinders, and the mounting holes of the front section, the middle section and the rear section of the barrel are further provided with lifting rings.

[0012] The method for using the automatic beveling machine for double-gun automatic welding of natural gas pipelines comprises the following steps:

[0013] S1: selecting a beveling machine with appropriate processing capacity according to the diameter of the pipeline to be processed, and selecting a tool shape suitable for the beveling form of the pipeline to be processed;

[0014] S2: reinforcing the storage state of the pipeline to be processed to ensure that the beveling machine is relatively stable during installation and processing;

[0015] S3: retracting all the hydraulic cylinders, so that the outer contour circle of the retracted hydraulic cylinder group is smaller than the outer contour circle diameter of the guide wheel group, and as many feed knobs as possible are retracted into the feed knob seat, which is beneficial to adjusting the position of the track slider group on the operation slide rail group;

[0016] S4: lifting the beveling machine by using the lifting ring, at this time the feed knob group is downward, and the operation slide rail group is rotated to make the beveling machine be at the lower end position:

[0017] S5: adjusting the contour spring, loosening the contour spring to make the track slider group away from the center barrel, or adjusting the contour spring, compressing the contour spring to make the track slider group close to the center barrel, so that the track slider group is as far away from the pipeline wall as possible when the beveling machine is lifted and inserted into the pipeline, avoiding the shaking of the track slider group during lifting and insertion to avoid the collision between the track slider group and the pipeline wall;

[0018] S6: slowly moving the lifted beveling machine into the pipeline, at this time the guide wheel group located in the rear section of the barrel contacts the bottom of the pipeline to form a support point, gradually reducing the support force of the lifting ring located in the middle section of the barrel, until the lifting ring connection point located in the middle section of the barrel is separated, at this time the weight of the beveling machine is balanced by the lifting ring of the front section of the barrel and the guide wheel group of the rear section of the barrel;

[0019] S7: further pushing the beveling machine into the pipeline until reaching a predetermined position H, the predetermined position H is preferably the distance between the proximal end face of the operation slide rail group and the end face of the pipeline, the value of H is the distance between the tool protruding from the operation slide rail group and the distance between the tool edge and the end face of the pipeline h, the value of h is preferably the theoretical tolerance band value of the flatness of the pipeline end, so that the predetermined distance after installation, the first cutting depth of the beveling tool will not exceed the maximum feed amount set by the beveling machine, and will not leave too large gap to cause waste of too much stroke gap time for the first tool;

[0020] S8: Adjust the limit rod, so that the track slider group moves to a predetermined position on the working slide rail group, and the predetermined position is a position where the cutter on the cutter slider is opposite the pipe wall thickness:

[0021] S9: After the beveling machine reaches the predetermined position, the hydraulic cylinder oil pipe quick connector is connected, the hydraulic motor oil pipe quick connector is connected, all hydraulic cylinders are pumped, the predetermined pressure is reached, and the pressure is maintained. During the pressurization process, several oil cylinders are extended, and the friction block is in contact with the inner wall of the pipe. Since all the hydraulic cylinders are connected in series, the force of each oil cylinder piston rod is the same. Since the oil cylinder group located in the middle section of the cylinder and the oil cylinder group located in the rear section of the cylinder are both odd numbers, the mechanical balance of each oil cylinder is achieved when the center cylinder is relatively located in the center of the pipe. During the automatic expansion process of the beveling machine, the centering work is also completed, and the lifting rig is separated;

[0022] S10: Start the hydraulic motor and run at low speed to make the track slider group rotate for several weeks, check the interference between the cutter and the pipe end face, manually rotate the feed screw to make the cutter blade close to the pipe end face, and the working slide rail runs to the lowest position. Close to the feed knob group;

[0023] S11: Extend the feed knob to a suitable meshing position with the gear at the end of the feed screw, and lock the position of the feed knob;

[0024] S12: Start the hydraulic motor to work, and every time the track slider rotates one circle, the feed knob drives the gear at the end of the feed screw by one tooth, and the cutter feeds a small distance, until the predetermined machining bevel size is reached;

[0025] S13: After completing the machining of the pipe end, the hydraulic motor is reversed for several turns, the feed knob is retracted, the limit rod is adjusted to move the cutter slider away from the pipe wall, the working slide rail is rotated to the lowest end, the lifting rig is connected to the front section of the cylinder, the hydraulic cylinder is depressurized and reversely supplied to retract the piston rod, the hydraulic pipe connector is separated, the front section of the beveling machine is slowly lifted and gradually extracted, and when the lifting ring in the middle section of the cylinder is exposed, the rig is connected at this position. Slowly lift away from the pipe, and thus one working cycle is completed.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] 1. The whole carrying weight is relatively light, the whole structure is compact, easy to transport and install, and has convenient benefits in the pipeline environment of desert, hilly wetland and other sites. 2. The invention integrates clamping, centering, cutting and feeding functions in one, is hoisted into the pipeline, and clamping and centering can be completed by starting the hydraulic source. After manual tool setting, flat end face, opening and breaking are performed by starting the hydraulic motor. The installation is convenient, the equipment is simple, and the assembly time of the beveling machine is shortened. 3. The beveling machine can be installed and operated at any angle, and is not affected by the space position and inclination state of the pipeline placement. 4. By adjusting the position of the track slider group on the operation slide rail group and the position of the feeding piece on the feeding piece seat, the diameter of the pipeline within a certain range can be adapted, and one beveling machine can process the pipeline within a certain diameter range. For different pipeline diameter construction sites, the number of different type beveling machines carried is reduced, and the carrying amount of each type of spare parts is reduced. 5. The invention has high automation integration degree, less manual auxiliary operation, and shortens the equipment preparation time of the operation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The structure of the embodiment of the invention is shown in the figure;

[0029] Figure 2 is Figure 1 A partial section in the direction of A in Figure 1 ;

[0030] Figure 3 is Figure 1 A partial section in the direction of A in Figure 2 ;

[0031] Figure 4 is Figure 1 A partial section in the direction of B in

[0032] Figure 5 is Figure 1 A partial section in the direction of A in Figure 3 .

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 1, center cylinder; 11, cylinder flange end; 12, cylinder front section; 13, cylinder middle section; 14, cylinder rear section; 2, inner ring; 21, inner ring structure; 22, inner ring mounting hole; 23, inner ring ball surface; 3, outer ring; 31, outer ring structure; 32, outer ring ball surface; 33, outer ring gear surface; 4, operation slide rail group; 41, slide rail structure; 42, profiled spring; 43, limiting rod; 5, track slider group; 51, track slider; 52, cutter slider; 53, feed screw; 6, feed knob group; 61, feed knob seat; 62, feed knob; 7, hydraulic motor; 71, motor body; 72, motor gear; 8, hydraulic oil cylinder; 81, oil cylinder body; 82, oil cylinder piston rod; 83, friction block; 9, guide wheel group; 91, wheel group support frame; 92, roller; 10, lifting ring. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] In combination Figure 1 Figure 5 As shown in the drawings, the embodiments of the present application provide an automatic beveling machine (hereinafter referred to as an automatic beveling machine) for automatic welding of a double-gun natural gas pipeline, which comprises:

[0037] A center cylinder 1 is used to move along the axis of the pipeline;

[0038] An operation slide rail group 4 is arranged at one end of the center cylinder 1 and has the same radial extension direction as the center cylinder 1, and the operation slide rail group 4 can rotate relative to the center cylinder 1;

[0039] A track slider group 5 is arranged on the operation slide rail group 4 and can slide along the extension direction of the operation slide rail group 4, and when the operation slide rail group 4 rotates, the track slider group 5 rotates synchronously, and the track slider group 5 and the operation slide rail group 4 remain relatively stationary, and a cutter is arranged on the track slider group 5;

[0040] A feed knob group 6 is arranged on the center cylinder 1, and every time the track slider group 5 rotates one revolution, the feed knob group 6 is used to drive the track slider group 5 to displace along the axial direction of the center cylinder 1.

[0041] ​Specifically, the present application takes the central cylinder 1 as the main component, the cylinder flange end 11 is provided with the inner ring 2 and the outer ring 3, the outer ring 3 rotates relative to the central cylinder 1 and the inner ring 2 under the drive of the hydraulic motor 7, the cylinder front section 12 and the cylinder rear section 14 are provided with a plurality of hydraulic oil cylinders 8 and guide wheel sets 9, the outer ring 3 is provided with the operation slide rail set 4, the operation slide rail set 4 is provided with the track slide block set 5, the track slide block 51 is embedded with the cutter slide block 52, the cutter is installed on the cutter slide block 52, the inner ring 2 is provided with the feed gear shifting piece set 6, the hydraulic oil cylinder 8 is elongated to expand the beveling machine in the inner wall of the pipeline, the outer ring 3 is rotated by the hydraulic motor 7, further drives the operation slide rail set 4, further drives the operation track slide block set 5, further drives the cutter operation movement, so as to realize the purpose of cutting the pipeline, the beveling machine is a complete pre-assembled set, is hoisted to the pipeline end and is directly inserted into the pipeline, the guide wheel set 9 can assist the beveling machine to be quickly and smoothly inserted into the pipeline, the hydraulic pipe installed in the central cylinder 1 applies oil pressure to the hydraulic oil cylinder 8, the plurality of hydraulic oil cylinders 8 can be elongated and expanded to the inner wall of the pipeline, so that the beveling machine is relatively fixed with the pipeline, the relative position of the cutter and the pipeline end is adjusted, and the pipeline end surface machining operation is realized by starting the hydraulic motor 7. The installation reference of the beveling machine is on the pipeline, and is not affected by the inclination of the pipeline. The expansion, cutting and other devices of the beveling machine are compact and light, and have high integration degree, so that the beveling machine can be conveniently transported and hoisted.

[0042] Optionally, one end of the central cylinder 1 is processed into the cylinder flange end 11, the cylinder flange end 11 is provided with the inner ring 2 and the outer ring 3, the inner ring 2 comprises an inner ring structure 21, an inner ring mounting hole 22 for mounting a fastener and an inner ring ball surface 23 for cooperating with a ball, the outer ring 3 comprises an outer ring structure 31, an outer ring ball surface 32 for cooperating with a ball and an outer ring gear surface 33, the inner ring ball surface 23 and the outer ring gear surface 33 are in rolling cooperation through a ball, so that the outer ring 3 can rotate relative to the central cylinder 1, and the inner ring 2 is fixedly connected to the central cylinder 1 through a fastener.

[0043] Specifically, the installed inner ring 2 is rigidly fixed relative to the central cylinder 1, the outer ring 3 can move relative to the central cylinder 1, the cylinder flange end 11, the inner ring 2 and the outer ring 3 form a rotary support structure, so as to realize the rotation of the beveling machine cutter and the fixation relative to the pipeline; the cylinder flange end 11 is processed with a plurality of pin holes and internal thread holes, the inner ring mounting hole 22 is a plurality of through holes and internal thread holes, and each pin hole or thread hole corresponds one by one. During installation, the balls of the cylinder flange end 11 are first laid, then the outer ring 3 is installed, then the balls in contact with the inner ring 2 are laid, and finally the inner ring 2 is installed, the positioning pin and the fastener are installed, the precise assembly of the central cylinder 1, the inner ring 2 and the outer ring 3 is realized, and the outer ring 3 can only rotate, and other degrees of freedom are constrained.

[0044] Optionally, the work slide rail group 4 comprises a slide rail structure 41, a contour spring 42 and a limiting rod 43, one end of the slide rail structure 41 is fixedly connected with the outer ring 3, the other end of the slide rail structure 41 is provided with a threaded hole, the limiting rod 43 is an adjusting screw rod and is threadedly connected with the threaded hole, one end of the slide rail structure 41 abuts against one end of the contour spring 42, and the other end of the contour spring 42 is used for abutting against the track slide block group 5.

[0045] Specifically, the slide rail structure 41 can be precisely and rigidly connected with the outer ring 3 by using a positioning pin and a screw, the work slide rail group 4 is used for supporting and positioning the relative position of the track slide block group 5 and providing a clamping force, the displacement of the limiting rod 43 is adjusted by rotating, the track slide block group 5 is moved and kept at a predetermined position of the work slide rail group 4, so as to adapt to the pipe with a corresponding pipe diameter; by adjusting the displacement of the limiting rod 43, the diameter of the pipe in the adjusting range can be adapted, the advantage that the machining caliber transverse range is large is realized, and the contour spring 42 can also be compressed and deformed when subjected to a large reaction force of the track slide block group 5, so as to realize that the tool running track is highly consistent with the shape of the pipe end face.

[0046] Optionally, the track slide block group 5 comprises a track slide block 51, a tool slide block 52 and an advancing screw 53, the track slide block group 5 is clamped and kept at a predetermined position of the work slide rail group 4 by the limiting rod 43 and the contour spring 42, the track slide block 51 is slidingly nested in a predetermined track of the slide rail structure 41 and can slide along the extension direction of the slide rail structure 41, the tool slide block 52 is slidingly nested in the track slide block 51 and can slide along the axial direction of the central cylinder 1, one end of the tool slide block 52 is machined with an internal thread matched with the advancing screw 53, the other end of the tool slide block 52 is machined with a hole used for installing a tool, the advancing screw 53 is threadedly connected in the tool slide block 52, one end of the advancing screw 53 is rotationally connected to the track slide block 51, and the other end of the advancing screw 53 is provided with a gear.

[0047] Specifically, the rotation of the gear at the end of the advancing screw 53 can drive the rotation of the advancing screw 53, further drive the sliding of the tool slide block 52 in the track slide block 51, and realize the tool feeding machining operation.

[0048] Optionally, the advancing lever group 6 comprises an advancing lever seat 61 and an advancing lever 62, the advancing lever seat 61 is internally provided with a sliding groove for adjusting the extension length of the advancing lever 62, one end of the advancing lever seat 61 is fixedly connected to the inner ring 2 and the radial extension direction of the advancing lever seat 61 is the same as that of the inner ring 2, one end of the advancing lever 62 is embedded in the sliding groove of the advancing lever seat 61, and the other end of the advancing lever 62 is integrally formed as a tooth structure matched with the gear at the end of the advancing screw 53.

[0049] Specifically, when the track slider assembly 5 and the cutter are adjusted to the predetermined position, the extension length of the feed lever seat 61 is adjusted so that the toothed structure at its end meshes with the gear at the end of the feed screw 53. That is, every time the cutter slider 52 rotates, the gear at the end of the feed screw 53 contacts and meshes with the toothed structure at the end of the feed lever 62, causing the cutter slider 52 to be propelled forward a certain distance by the feed lever seat 61. As the cutter slider 52 continues to rotate, the gear at the end of the feed screw 53 and the toothed structure at the end of the feed lever 62 gradually move away from each other, thereby disengaging and realizing the feed of the cutter. The relative installation position of the feed lever assembly 6 on the outer ring 3 is far away from the combined force of the lifting ring 10, so that when the beveling machine is lifted by several lifting rings 10, the feed lever assembly 6 is always downward. At the same time, rotating the outer ring 3 also lowers the working slide rail assembly 4, so as to keep the center of the beveling machine in a relatively low position during lifting and avoid rollover during lifting.

[0050] Optionally, a hydraulic motor 7 is also included. The hydraulic motor 7 includes a motor body 71 and a motor gear 72. The central cylinder 1 has a front section 12. The motor body 71 is fixedly installed inside the front section 12. The output shaft of the motor body 71 passes through the front section 12 and is equipped with a motor gear 72. The motor gear 72 meshes with the outer ring 3.

[0051] Specifically, the hydraulic motor 7 is driven by the oil pipe, which in turn drives the motor gear 72 to rotate. The motor gear 72 then drives the outer ring 3 to rotate, which in turn drives the rotation of the working slide rail assembly 4 and the track slider assembly 5, as well as the feed of the tool.

[0052] Optionally, it also includes a hydraulic cylinder 8, which includes a cylinder body 81, a cylinder piston rod 82, and a friction block 83. The cylinder body 81 is fixedly connected to the central cylinder 1, and the end of the cylinder piston rod 82 in the cylinder body 81 is equipped with a friction block 83.

[0053] Specifically, the cylinder body 81 can be rigidly fixed to the central cylinder 1 by fasteners and locating pins. The oil circuits of the array of hydraulic cylinders 8 are connected in series. During hydraulic drive, the piston rod 82 of each cylinder experiences the same pressure. Figure 3 and Figure 4 As shown, several hydraulic cylinders 8 of the same size are evenly distributed in the front section 12 of the cylinder. This number should preferably be odd. Several hydraulic cylinders 8 of the same size are evenly distributed in the rear section 14 of the cylinder. This number should also preferably be odd. When the odd number of hydraulic cylinders 8 are driven by the same hydraulic oil, they can provide the same supporting force, so that the central cylinder 1 under the state of multi-point supporting force is located as close as possible to the centroid of the pipe. This avoids the situation where the centroid of the pipe section deviates too much from the centroid of the same section of the central cylinder 1 due to the mechanical balance of the two axisymmetric cylinders. The relative distance between the hydraulic cylinders 8 located in the front section 12 of the cylinder and the hydraulic cylinders 8 located in the rear section 14 of the cylinder should be as far as possible to improve the coaxiality of the central cylinder 1 and the pipe.

[0054] Optionally, it also includes a guide wheel assembly 9, which includes a wheel assembly support frame 91 and a roller 92. One end of the wheel assembly support frame 91 is fixedly connected to the central cylinder 1, and the other end of the wheel assembly support frame 91 is rotatably connected to the roller 92.

[0055] Specifically, such as Figure 1 , Figure 3 , Figure 4 As shown, the wheel assembly support frame 91 and the central cylinder 1 can be rigidly fixed with positioning pins and fasteners. The roller 92 can rotate freely on the wheel assembly support frame 91, and the overall height of the guide wheel assembly 9 is slightly higher than that of the hydraulic cylinder 8 in its retracted state, so that when the beveling machine is hoisted into the pipe, the roller 92 always contacts the inner wall of the pipe first, avoiding damage to the hydraulic cylinder 8 from collision with the inner wall of the pipe. Figure 3 and Figure 4 As shown, the guide wheel assembly 9 should be arranged alternately with the hydraulic cylinder 8. The distance between the guide wheel assembly 9 located in the front section 12 of the cylinder and the guide wheel assembly 9 located in the rear section 14 of the cylinder should be as large as possible to provide a larger protection range when the beveling machine tilts.

[0056] Optionally, the front section 12 of the cylinder is provided with a mounting hole for mounting the motor body 71. The central cylinder 1 also has a middle section 13 and a rear section 14. The middle section 13 and the rear section 14 are provided with mounting holes for mounting the hydraulic cylinder 8. Lifting rings 10 are also installed in the mounting holes of the front section 12, the middle section 13 and the rear section 14.

[0057] Specifically, the mounting holes on the front section 12, middle section 13 and rear section 14 of the cylinder can also be used to install hydraulic pipes and other related components, and the central cylinder 1 should have high strength to resist the torque generated during processing.

[0058] The operating method of the automatic beveling machine for dual-gun automatic welding of natural gas pipelines includes the following steps:

[0059] S1: Select a beveling machine with appropriate processing capacity according to the diameter of the pipe to be processed, and select a suitable cutting tool shape according to the beveling method of the pipe diameter to be processed.

[0060] S2: Reinforce the storage condition of the pipe to be processed to ensure that the beveling machine is placed relatively stably after installation and during processing;

[0061] S3: Retract all the hydraulic cylinders 8 so that the outer contour circle of the retracted hydraulic cylinder group 8 is smaller than the outer contour circle diameter of the guide wheel group 9, and retract the feed cutter 62 into the feed cutter seat 61 as much as possible, which is conducive to adjusting the position of the track slider group 5 on the working slide rail group 4.

[0062] S4: Use lifting ring 10 to lift the beveling machine. At this time, the feed cutter assembly 6 is downward, and the working slide rail assembly 4 is rotated to be at the lower end of the beveling machine.

[0063] S5: Adjust the conformal spring 42, loosen the conformal spring 42 to move the track slider assembly 5 away from the central cylinder 1, or adjust the conformal spring 42 to compress the conformal spring 42 to move the track slider assembly 5 closer to the central cylinder. This way, when the beveling machine lifts and inserts the pipe, the track slider assembly 5 is kept as far away from the pipe wall as possible, avoiding the shaking during the lifting process that causes the track slider assembly 5 to collide with the pipe wall.

[0064] S6: The hoisted beveling machine is slowly moved into the pipe and inserted. During insertion, the guide wheel group 9 located in the rear section 14 of the cylinder contacts the bottom of the pipe as appropriate to form a support point. The supporting force of the lifting ring 10 located in the middle section 13 of the cylinder is gradually reduced until the lifting ring 10 in the middle section 13 of the cylinder is no longer under force. Then the connection point of the lifting ring 10 located in the middle section 13 of the cylinder is separated. At this time, the weight of the beveling machine itself is supported and balanced by the lifting ring 10 in the front section 12 of the cylinder and the guide wheel group 9 in the rear section 14 of the cylinder.

[0065] S7: Push the beveling machine further into the pipe until it reaches the predetermined position H. The predetermined position H should be the distance between the near end face of the working slide rail group 4 and the pipe end face. The value of H is the distance of the tool protruding from the working slide rail group 4 plus the distance h between the tool tip and the pipe end face. The value of h should be the theoretical tolerance value of the pipe end flatness. In this way, when the beveling machine is started after the installation is completed, the first cut depth will not exceed the maximum feed rate set by the beveling machine, and there will not be too large a gap, which will cause too much travel gap time to be wasted during the first cut.

[0066] S8: Adjust the limit rod 43 so that the track slider group 5 moves on the working slide rail group 4 to the predetermined position, which is the position where the cutter on the cutter slider 52 is directly opposite the pipe wall thickness:

[0067] S9: After the beveling machine reaches the predetermined position, connect the quick-connect couplings of the hydraulic cylinder 8 and the hydraulic motor 7 to pump pressure into all hydraulic cylinders 8 until the predetermined pressure is reached and maintained. During the pressurization process, several cylinders extend and the friction block 83 contacts the inner wall of the pipe. Since all hydraulic cylinders 8 are connected in series, the piston rod 82 of each cylinder has the same force. Since the cylinder group located in the middle section 13 of the cylinder and the cylinder group located in the rear section 14 of the cylinder are both odd numbers, when the central cylinder 1 is relatively at the center of the pipe, the cylinders are mechanically balanced. The centering work is also completed during the automatic tightening process of the beveling machine, and the lifting slings are separated.

[0068] S10: Start the hydraulic motor 7 and run it at low speed to make the track slider group 5 run for several cycles. Check the interference between the tool and the pipe end face. Manually rotate the feed screw 53 to make the tool edge close to the pipe end face. The working slide rail runs to the lowest position and approaches the feed lever group.

[0069] S11: Extend the feed lever 62 to a suitable meshing position with the gear at the end of the feed screw 53, and lock the feed lever 62 in position;

[0070] S12: Start the hydraulic motor 7 to perform the processing operation. For each rotation of the track slider, the feed paddle 62 moves the end face gear of the feed screw 53 by one tooth, and the tool feeds a short distance until the predetermined processing bevel size is reached.

[0071] S13: After completing the pipe end processing, the hydraulic motor 7 reverses several times, retracts the feed cutter 62, adjusts the limit rod 43 to make the cutter slider 52 away from the pipe wall, the working slide rail group 4 rotates to the lowest end, connects the lifting slings of the front section of the cylinder, the hydraulic cylinder 8 depressurizes and reverses oil supply to retract the cylinder piston rod 82, separates the hydraulic pipe connector, slowly lifts the front section of the beveling machine and gradually pulls it out, when the lifting ring 10 of the middle section 13 of the cylinder is exposed, connect the slings at that position, and slowly lift it away from the pipe, thus completing one work cycle.

[0072] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. An automatic beveling machine for double gun automatic welding of natural gas pipelines, characterized in that, The utility model relates to a center tube (1) for moving along the axis of the pipeline, a work slide rail group (4) arranged at one end of the center tube (1) and extending radially from the center tube (1), the work slide rail group (4) being rotatable relative to the center tube (1), a track slide block group (5) arranged on the work slide rail group (4) and slidable along the extension direction of the work slide rail group (4), the track slide block group (5) rotating synchronously with the work slide rail group (4) and remaining relatively stationary relative to the work slide rail group (4) when the work slide rail group (4) rotates, the track slide block group (5) being provided with a cutter, an infeed shifting piece group (6) arranged on the center tube (1) and used to drive the track slide block group (5) to move axially along the center tube (1) every time the track slide block group (5) rotates one revolution, one end of the center tube (1) being processed into a flange end (11), the flange end (11) being provided with an inner ring (2) and an outer ring (3), the inner ring (2) including an inner ring structure (21), an inner ring mounting hole (22) for mounting a fastener, and an inner ring ball rolling surface (23) for cooperating with a ball, the outer ring (3) including an outer ring structure (31), an outer ring ball rolling surface (32) for cooperating with a ball, and an outer ring gear surface (33), the inner ring ball rolling surface (23) and the outer ring gear surface (33) being in rolling cooperation through a ball to enable the outer ring (3) to rotate relative to the center tube (1), the inner ring (2) being fixedly connected to the center tube (1) through a fastener, the work slide rail group (4) including a slide rail structure (41), a conformable spring (42), and a limiting rod (43), one end of the slide rail structure (41) being fixedly connected to the outer ring (3), the other end of the slide rail structure (41) being provided with a threaded hole, the limiting rod (43) being an adjusting screw and being in threaded connection with the threaded hole, one end of the slide rail structure (41) close to the outer ring (3) abutting against one end of the conformable spring (42), the other end of the conformable spring (42) being used to abut against the track slide block group (5). ​ ​ ​ ​ ​ ​ The track slider group (5) includes a track slider (51), a tool slider (52) and a feed screw (53). The track slider group (5) is clamped and held in a predetermined position of the operation slide rail group (4) by the limit rod (43) and the contour spring (42). The track slider (51) is slidingly nested in a predetermined track of the slide rail structure (41) and can slide along the extension direction of the slide rail structure (41). The tool slider (52) is slidingly nested in the track slider (51) and can slide axially along the central cylinder (1). One end of the tool slider (52) is machined with an internal thread adapted to the feed screw (53). The other end of the tool slider (52) is machined with a hole for mounting the tool. The feed screw (53) is threadedly connected in the tool slider (52). One end of the feed screw (53) is rotatably connected to the track slider (51). The other end of the feed screw (53) is provided with a gear. The feed knob group (6) includes a feed knob seat (61) and a feed knob (62). The feed knob seat (61) is internally provided with a sliding groove for adjusting the extension length of the feed knob (62). One end of the feed knob seat (61) is fixedly connected to the inner ring (2), and the radial extension direction of the feed knob seat (61) is the same as that of the inner ring (2). One end of the feed knob (62) is embedded in the sliding groove of the feed knob seat (61). The other end of the feed knob (62) is integrally formed as a tooth structure adapted to the gear at the end of the feed screw (53).

2. The automatic beveler for double gun automatic welding of natural gas pipelines according to claim 1, characterized in that, The hydraulic motor (7) includes a motor body (71) and a motor gear (72). The central cylinder (1) has a cylinder front section (12). The motor body (71) is fixedly installed inside the cylinder front section (12). The output shaft of the motor body (71) penetrates the cylinder front section (12) and is provided with the motor gear (72). The motor gear (72) is engaged with the outer ring (3).

3. The automatic beveler for double gun automatic welding of natural gas pipelines according to claim 2, characterized in that, The hydraulic oil cylinder (8) includes a cylinder body (81), a cylinder piston rod (82) and a friction block (83). The cylinder body (81) is fixedly connected to the central cylinder (1). The end of the cylinder piston rod (82) in the cylinder body (81) is provided with the friction block (83).

4. The automatic beveler for double gun automatic welding of natural gas pipelines according to claim 3, characterized in that, The guide wheel group (9) includes a wheel group support frame (91) and a roller (92). One end of the wheel group support frame (91) is fixedly connected to the central cylinder (1). The other end of the wheel group support frame (91) is rotatably connected to the roller (92).

5. The automatic beveler for double gun automatic welding of natural gas pipelines according to claim 4, characterized in that, The front section (12) of the barrel is provided with a mounting hole for mounting the motor body (71), and the center barrel (1) further has a middle barrel section (13) and a rear barrel section (14), which are provided with mounting holes for mounting the hydraulic oil cylinder (8) and the hydraulic oil cylinder (8), and the mounting holes of the front section (12), the middle barrel section (13) and the rear barrel section (14) are further provided with lifting rings (10).

6. A method of using the automatic beveling machine for double gun automatic welding of natural gas pipelines as claimed in claim 5, characterized in that, The method comprises the steps of: S1: selecting a beveling machine with appropriate processing capacity according to the diameter of the pipe to be processed, and selecting a suitable tool shape according to the bevel form of the pipe to be processed; S2: reinforcing the storage state of the pipe to be processed to ensure that the beveling machine is relatively stable after installation and during processing; S3: retracting all hydraulic oil cylinders (8) to make the outer contour circle of the retracted hydraulic oil cylinder (8) group smaller than the outer contour circle diameter of the guide wheel group (9), and as many feed knobs (62) as possible are retracted into the feed knob seat (61) to facilitate the adjustment of the position of the track slider group (5) on the operation slide rail group (4); S4: lifting the beveling machine by using the lifting ring (10), at this time the feed knob group (6) is downward, and the operation slide rail group (4) is rotated to make the beveling machine at the lower end position: S5: adjusting the contour spring (42), loosening the contour spring (42) to make the track slider group (5) away from the center barrel (1), or adjusting the contour spring (42), compressing the contour spring (42) to make the track slider group (5) close to the center barrel, so that the track slider group (5) is as far away from the pipe wall as possible when the beveling machine is lifted and inserted into the pipe, avoiding the collision between the track slider group (5) and the pipe wall caused by shaking during lifting and inserting; S6: slowly moving the lifted beveling machine into the pipe to insert, the guide wheel group (9) located in the rear barrel section (14) contacts the pipe bottom to form a support point as needed, the support force of the lifting ring (10) located in the middle barrel section (13) is gradually reduced, and when the lifting ring (10) located in the middle barrel section (13) is not stressed, the lifting ring (10) connection point located in the middle barrel section (13) is separated, at this time the weight of the beveling machine is balanced by the lifting ring (10) of the front barrel section (12) and the guide wheel group (9) of the rear barrel section (14); S7: further pushing the beveling machine into the pipe until reaching a predetermined position H, the predetermined position H is preferably the distance between the proximal end surface of the operation slide rail group (4) and the pipe end surface, and the value of H is the distance between the tool protruding operation slide rail group (4) and the distance between the tool edge and the pipe end surface h, the value of h is preferably the theoretical tolerance band value of the pipe end flatness, so that the predetermined distance after installation is started, the first cutting depth does not exceed the maximum feed amount set by the beveling machine, and does not leave a too large gap to cause too much travel gap time for the first tool; S8: adjusting the limiting rod (43) to make the track slider group (5) move to a predetermined position on the operation slide rail group (4), and the predetermined position is the position where the tool on the tool slider (52) is opposite to the pipe wall thickness: S9: After the groove machine reaches the predetermined position, connect the hydraulic cylinder (8) oil pipe quick connector, connect the hydraulic motor (7) oil pipe quick connector, pump all the hydraulic cylinders (8), reach the predetermined pressure, and keep, several oil cylinders extend during the pressurization process, the friction block (83) is in contact with the inner wall of the pipeline, because all the hydraulic cylinders (8) are connected in series, so the force of each oil cylinder piston rod (82) is the same, because the oil cylinder group located in the middle section (13) of the cylinder and the oil cylinder group located in the rear section (14) of the cylinder are both odd, when the center cylinder (1) is relative to the center of the pipeline, the mechanical balance of each oil cylinder is balanced, and the centering work is also completed during the automatic expansion process of the groove machine, and the lifting rigging is separated; S10: Start the hydraulic motor (7), run the track slider group (5) for several weeks at low speed, check the interference between the cutter and the pipeline end face, manually rotate the feed screw (53), make the cutter blade close to the pipeline end face, and the operation slide rail runs to the lowest position. Close to the feed knob group; S11: Extend the feed knob (62) to the appropriate meshing position with the end gear of the feed screw (53), lock the position of the feed knob (62); S12: Start the hydraulic motor (7) for the operation, and the track slider rotates one circle, the feed knob (62) drives the end gear of the feed screw (53) one tooth, and the cutter feeds a small distance, until the predetermined machining groove size is reached; S13: After the pipeline end machining is completed, the hydraulic motor (7) is reversed for several turns, the feed knob (62) is retracted, the limit rod (43) is adjusted to make the cutter slide block (52) away from the pipeline wall, the operation slide rail group (4) is rotated to the lowest end, the front section lifting rigging is connected, the hydraulic cylinder (8) is depressurized and reversely supplied to retract the oil cylinder piston rod (82), the hydraulic pipe connector is separated, the groove machine front section is slowly lifted and gradually extracted, when the cylinder middle section (13) lifting ring (10) is exposed, the rigging at this position is connected, and the groove machine is slowly lifted away from the pipeline. At this point, a work cycle is completed.

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