Outdoor numerical control machine tool suitable for opening plugging piece and machining mode

Abstract

The invention relates to the technical field of machining, and discloses an outdoor numerical control machine tool suitable for an opening plugging piece and a machining mode, the outdoor numerical control machine tool comprises a machining machine installed at a pipe opening to be machined and a control system connected with the machining machine through a cable; the machining machine comprises a base, multiple sets of clamping pieces are arranged at the bottom of the base, and the inner sides of the clamping pieces abut against a pipe to be machined. A driving motor is arranged on the outer side of the base; a main shaft turntable is arranged on the base and comprises a rotating bearing, an inner ring of the rotating bearing is connected with the base, and a turntable seat is arranged on an outer ring of the rotating bearing; a conducting ring is arranged on the rotating bearing; the conducting ring comprises a fixed ring and a movable ring which are in rotary contact, the control system is electrically connected with the fixed ring, and the movable ring is electrically connected with the driving motor; and a double-shaft servo mechanism is arranged on the turntable seat. Light weight of outdoor processing equipment is achieved, movement and installation are more convenient, the outdoor processing equipment can be suitable for more complex or special processing scenes, the processing efficiency is higher, the processing quality is guaranteed, and the processing requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to an outdoor numerical control machine tool and a processing method suitable for an open-mouth sealing piece. Background Art

[0002] During the booming period of the oil industry, a large number of oil and gas wells were drilled to meet production needs. When exploitation reaches a certain level, abandoned wells or wells waiting to be produced will be formed. With the continuous expansion of urbanization, some wellheads that were originally in the wilderness have been replanned and rebuilt. At this time, the wellheads need to be safely handled. The specific measures are to cut off the well pipe at a certain depth below the ground level, re-process the tapered circular thread mouth at the retained part of the pipe mouth, and install the matching plugging components. The wellhead after plugging must meet certain pressure requirements, so there are now high requirements for the processing accuracy of the thread mouth.

[0003] At present, the processing of threaded threads generally adopts the method of first putting a tapered countersink on the cut pipe mouth to create an outer cone, and then using a tapered die to tap the thread mouth. However, both steps require the operator to complete them by "pushing the grinding disc", making the processing process time-consuming and labor-intensive. In addition, this method of processing has huge cutting resistance, and a longer grinding disc push rod is required to save effort, which requires a large working space and increases the amount of earth and stone excavation. In addition, this operation is intermittent during the force application process, resulting in unsatisfactory thread quality and difficulty in meeting the pressure-bearing sealing requirements. If a hydraulic drive method is used to replace the grinding process, the hydraulic output is not precise enough, and if the terrain around the wellhead is complex or on the sea surface, its drive device also requires sufficient installation and layout space, making it inapplicable.

[0004] In addition, there is an existing "beveling machine" technology, which is sleeved on the outer wall of the processed pipe and uses a motor-driven tool to radially cut the pipe mouth. However, since the remaining pipe can only be used after processing, and is limited by the usage scenario, it can only achieve cutting of the pipe mouth or cutting and chamfering operations, and cannot perform high-precision and complex operations such as thread processing. Therefore, the processing of the thread still needs to be performed by an operator, resulting in the existing well pipe mouth processing difficulty, low processing efficiency, and difficulty in ensuring the processing quality of the thread mouth.

[0005] For example, the invention patent with the patent number "CN113770459B" discloses an outdoor machining equipment. Although it can realize the thread processing operation on the pipe mouth and meet the processing accuracy requirements, it is large in size and the installation operation is complicated. It is necessary to pay attention to the counterweight of the upper conductive slip ring and the lower mechanism at all times, which affects the operation stability. In addition, when facing special processing scenarios, it will also be restricted by site installation and cannot be applied. And because of its large size, it is also difficult to carry and move, resulting in poor mobility and failure to meet lightweight requirements, which limits its scope of application. Summary of the invention

[0006] The present invention aims to provide an outdoor CNC machine tool and processing method suitable for open-mouth plugging parts, so as to solve the problems of existing well pipe mouth thread processing being difficult, low in processing efficiency, and poor quality stability, especially in the face of complex or special processing scenarios, the processing process is unstable and it is difficult to meet the processing requirements.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme, which is suitable for an outdoor CNC machine tool for open-mouth plugging parts, including a processing machine installed on the pipe mouth to be processed, and a control system connected to the processing machine through a cable; the processing machine includes a base arranged on the pipe to be processed, and a plurality of groups of clamping members are arranged at the bottom of the base, and the inner side of the clamping assembly abuts against the pipe to be processed; a driving motor is arranged on the outer side of the base; a spindle turntable is arranged on the base, and the spindle turntable includes a rotating bearing, the inner ring of the rotating bearing is connected to the base, and a turntable seat is arranged on the outer ring of the rotating bearing; a conductive ring is arranged on the rotating bearing; the conductive ring includes a fixed ring and a moving ring in rotating contact, the control system is electrically connected to the fixed ring, and the moving ring is electrically connected to the driving motor; a dual-axis servo mechanism is arranged on the turntable seat.

[0008] Furthermore, the outer side of the outer ring of the rotating bearing is a gear structure, and is meshed with the driving gear on the driving motor.

[0009] Furthermore, a plurality of contact grooves are provided on the outer side of the fixed ring; a plurality of contact brushes are provided on the inner side of the movable ring, and the contact brushes are in rotational contact with the contact grooves.

[0010] Furthermore, the dual-axis servo mechanism includes an X-axis servo system arranged on the turntable seat, and a Z-axis servo system arranged on the X-axis servo system; a tool structure is arranged on the Z-axis servo system.

[0011] Furthermore, the clamping members include eight groups, and are arranged on the base in two layers, upper and lower circles.

[0012] Furthermore, a counterweight block is provided on the turntable seat, and the counterweight block is symmetrically arranged with the dual-axis servo mechanism.

[0013] At the same time, the present solution also provides an outdoor CNC machine tool processing method suitable for an open-mouth plugging piece, which is applied to the above-mentioned outdoor CNC machine tool and includes the following steps:

[0014] Step 1, determining the position of the cutting point of the pipe to be processed according to the environment where the pipe to be processed is located;

[0015] Step 2, setting the installation position of the processing machine according to the cut-off point; first installing the clamping plate on the tube to be processed according to the installation position, then installing the base and the spindle turntable on the clamping plate, and clamping and fixing them after leveling through the clamping parts;

[0016] Step 3, electrically connecting the control system to the processing machine through cables, and controlling the dual-axis servo mechanism to drive the tool structure to operate according to the set processing flow;

[0017] Step 4: After processing is completed, the pipe mouth to be processed is inspected. If it meets the standards, the processing machine is removed and the processed surface of the pipe mouth is cleaned.

[0018] Furthermore, the position of the cutting point needs to be at least 1.5 m below the ground level; the distance between the upper end surface of the base and the pipe opening of the pipe to be processed is 550 to 650 mm.

[0019] Furthermore, it also includes a leveling step, which includes initial leveling and dynamic leveling; the initial leveling is in step 2, when the processing machine is installed, the rotation center of the processing machine is adjusted to meet the leveling requirements; the dynamic leveling is in step 3, the rotation center of the processing machine is monitored in real time and adjusted.

[0020] Further, in step 3, the processing flow includes the following sub-steps:

[0021] Step 3.1, cutting out a new pipe opening at the determined cutting point;

[0022] Step 3.2, smoothing the pipe mouth to be processed;

[0023] Step 3.3, perform thread processing with multiple tools according to the set radial step distance.

[0024] The principles and advantages of this solution are:

[0025] In the prior art, since the connection requirement of the control system is to keep the position of the cable relatively fixed to the access end, the control system and the processing machine are designed as one to meet this processing requirement. However, this results in a large overall device volume, which is not convenient for movement and installation, and the device also needs to be sufficiently stable to achieve the required processing accuracy. As a result, it is difficult to achieve the requirements of lightweight and high rigidity of the equipment.

[0026] This solution adopts a conductive ring structure, which cleverly divides the machine body into a rotating part and a stationary part. It also changes the past thinking mode that the machine body is stationary, and sets the machine body as the rotating part, while connecting the stationary part with the control system, solving the problem of communication transmission between the control system and the processing machine. In this way, while ensuring that the control system access end is relatively stationary, the separate design of the machine body and the control system is realized, thereby reducing the weight and volume of the overall processing machine, achieving the lightweight and convenience of outdoor processing equipment, and effectively improving its mobility, so that it can be more suitable for a variety of processing scenarios.

[0027] At the same time, while reducing the overall weight of the equipment, a high-power spindle motor can be installed under the base, which can not only increase the stability of the base, but also improve the cutting stability. Therefore, carbide tools with higher hardness but poorer toughness can be used to reduce the risk of tool tip breakage, greatly improving processing quality and efficiency. This solution can replace tools according to the processing scenario, making the operation more convenient and applicable to a wider range, greatly improving processing efficiency, and realizing automated, high-precision processing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of an outdoor CNC machine tool suitable for an open-mouth plugging piece according to the present invention.

[0029] Figure 2 It is a schematic structural diagram of an outdoor CNC machine tool processing machine suitable for an open port plugging piece according to the present invention.

[0030] Figure 3 The present invention is a schematic structural diagram of the clamping claws of an outdoor CNC machine tool suitable for an open-mouth plugging piece.

[0031] Figure 4 The present invention is a schematic structural diagram of the meshing of the outer ring of the rotating bearing of an outdoor CNC machine tool applicable to an open-mouth plugging piece and a driving gear.

[0032] Figure 5 The present invention is a schematic flow chart of an outdoor CNC machine tool processing method for an open-mouth plugging piece. DETAILED DESCRIPTION

[0033] The following is further described in detail through specific implementation methods:

[0034] The figure marks in the accompanying drawings include: tube to be processed 1, processing machine 2, cable 3, control system 4, base 5, clamping part 6, driving motor 7, spindle turntable 8, rotating bearing 9, turntable seat 10, driving gear 11, conductive ring 12, dual-axis servo mechanism 13, X-axis servo system 14, Z-axis servo system 15, tool structure 16, tool holder 17, turning tool 18, counterweight block 19, dust cover 20.

[0035] Embodiment 1

[0036] The outdoor CNC machine tool suitable for the open-mouth plugging piece in this embodiment is a vertical CNC processing machine that can operate on the pipe openings of oil and gas wells outdoors. While cutting the pipe openings, it can complete the precision processing of the threaded thread openings. It has high rigidity, light weight and high stability, improves processing efficiency and ensures processing quality. In this embodiment, as shown in the attached Figure 1 As shown, the outdoor CNC machine tool includes a processing machine 2, and a control system 4 connected to the processing machine 2 through a cable 3. The processing machine 2 and the control system 4 are designed as separate structures, and the two are connected by a quick-change cable. The processing machine 2 is installed on the pipe to be processed 1 and is responsible for the specific execution of the work. The numerical control system of the control system 4 is responsible for outputting control instructions, directing and controlling the processing machine 2 to operate the processing machine 2. In this embodiment, the pipe to be processed 1 is generally buried hundreds of meters or even thousands of meters underground, so the pipe to be processed can be regarded as a stable and fixed "support platform". Therefore, this solution jumps out of the fixed thinking logic that an additional site needs to be set up to meet the installation layout of the drive mechanism, but directly uses the pipe to be processed 1 itself as an installation support to achieve precision processing of the threaded thread.

[0037] In this embodiment, as shown in the attached Figure 2 As shown, the processing machine 2 includes a base 5 sleeved on the tube 1 to be processed, and multiple groups of clamping members 6 are installed at the bottom of the base 5. The inner side of the clamping member 6 abuts against the outer side of the tube 1 to be processed, so that the base 5 is stably installed on the tube 1 to be processed. In the actual installation process, it is also necessary to first install a clamping plate for positioning and fixing on the tube 1 to be processed, and then install the base 5 on the clamping plate. In this embodiment, the clamping plate structure can be implemented using existing equipment technology, which will not be described in detail here. In this embodiment, the clamping member 6 is set to eight groups of clamping claws, as shown in the attached figure. Figure 3 As shown, eight groups of clamping jaws are arranged on the base 5 in two layers, that is, four groups are arranged opposite to each other in each layer, so as to form two pairs of upper and lower structures similar to four-jaw chucks to fix the base 5. In this embodiment, the base 5 is the non-moving part of the processing machine 2. After the processing machine 2 is installed on the working well pipe, the eight groups of clamping jaws hold the pipe wall tightly to provide a stable support for the processing machine 2.

[0038] A driving motor 7 is installed on the outside of the base 5, and a driving gear 11 is provided at the output end of the driving motor 7, and the driving gear 11 is driven to rotate by the driving motor 7. In this embodiment, the driving motor 7 is a high-power spindle motor, which makes it more stable in cutting. However, due to the limitations of volume and weight, low-power driving motors are generally used in outdoor processing equipment at present, resulting in insufficient structural rigidity of existing outdoor processing equipment, forcing it to use only high-speed steel tools instead of cemented carbide tools. Because cemented carbide tools have high hardness and poor toughness, the tip of the tool is very easy to break when in an unstable cutting state. Therefore, it cannot be applied to existing outdoor processing equipment, affecting the cutting efficiency.

[0039] Combined with Figure 4 As shown, a spindle turntable 8 is installed on the base 5, and the spindle turntable 8 is connected to the base 5 through a rotating bearing 9. In this embodiment, the spindle turntable 8 and the base 5 are an integrated structure after manufacturing, which is convenient for overall lifting and disassembly. In this embodiment, the rotating bearing 9 adopts a "cross roller bearing" to enable it to have good axial and radial load resistance. The rotating bearing 9 includes an inner ring and an outer ring, the inner ring of which is fixedly connected to the base 5, and the outer ring of which rotates relative to the inner ring. A turntable seat 10 is sleeved on the outer ring of the rotating bearing 9. In this embodiment, the outer side of the outer ring of the rotating bearing 9 is set as a gear structure, so that the outer ring of the rotating bearing 9 is meshed with the driving gear 11 on the driving motor, so that the outer ring of the rotating bearing 9 is driven to rotate by the rotation of the driving gear 11, and then the entire turntable seat 10 is driven to rotate, so that the turntable seat 10 can rotate freely relative to the base 5, which is convenient for thread processing of the pipe 1 to be processed.

[0040] In this embodiment, since the cable connection of the control system 4 to the machine body requires that the access end of the cable to the machine body remain relatively fixed, and the turntable seat 10 needs to be rotated for processing, the control system 4 is often designed to be integrated with the processing machine 2 to meet the requirement of relative fixation. However, this makes the entire device heavy, the structure more complicated, inconvenient to operate, and less safe.

[0041] Therefore, as attached Figure 2 As shown, in this embodiment, a conductive ring 12 is installed on the rotating bearing 9. The conductive ring 12 includes a fixed ring and a movable ring that are in rotational contact. A plurality of contact grooves are provided on the outer side of the fixed ring, and a plurality of contact brushes are provided on the inner side of the movable ring. The contact brushes are in rotational contact with the contact grooves. In this embodiment, a plurality of contact grooves and contact brushes made of precious metal materials are distributed parallel to the axial direction of the rotating shaft cylindrical surface between the movable ring and the fixed ring according to the number of channels for signal transmission required. The contact grooves and the contact brushes always maintain sliding contact, so that signal transmission can be achieved under the condition that one end rotates while the other end does not rotate.

[0042] Among them, the fixed ring is fixedly installed on the inner ring of the rotating bearing 9 and remains motionless together with the base 5; the moving ring is connected to the turntable seat 10 and moves synchronously with the turntable seat 10. In this embodiment, the control system 4 is electrically connected to the fixed ring through the cable 3, and their relative positions remain unchanged. The cable of the drive motor 7 is electrically connected to the moving ring of the conductive ring 12, and their relative positions also remain unchanged, so as to solve the problem of communication and transmission between the control system 4 and the processing machine 2. Thereby, the perfect coordination of "movement" and "stationary" is achieved without integrating the entire control system 4 into the machine body, effectively reducing the complexity of the processing machine 2, realizing a lightweight design, being more convenient to move and install, and improving its mobility and stability.

[0043] At the same time, in this embodiment, the conductive ring 12 is installed inside the machine body, and the cables inside the machine body are all concealed cables, so that the cable structure is more concealed and safe, effectively reducing heat while reducing mutual interference of signals, ensuring the stability of signal transmission, thereby improving the safety and reliability of the equipment, and also improving the appearance of the equipment. And the cables used are all plug-and-play quick-change socket interfaces, which are more convenient for transportation and use management, and improve their convenience and mobility.

[0044] A dual-axis servo mechanism 13 is installed on the turntable seat 10. In this embodiment, the dual-axis servo mechanism 13 includes an X-axis servo system 14 provided on the turntable seat 10, and a Z-axis servo system 15 provided on the X-axis servo system 14; a tool structure 16 is installed on the Z-axis servo system 15. In this embodiment, the tool structure 16 includes a tool holder 17 and a turning tool 18 provided on the tool holder 17. The turning tool 18 is used to process the tube 1 to be processed. In this embodiment, the tool is a carbide tool. Since the driving motor 7 used in this solution is a high-power spindle motor, which has better cutting stability, this solution can use a carbide tool to reduce the risk of tool tip chipping, thereby improving processing quality and efficiency.

[0045] In this embodiment, as shown in the attached Figure 2 As shown, the X-axis servo system 14 is installed on the turntable seat 10, the Z-axis servo system 15 is installed on the horizontal slide of the X-axis servo system 14 through the column, and the tool structure 16 is installed on the vertical slide of the Z-axis servo system 15. The X-axis slide carries the Z-axis column and can move horizontally, and the Z-axis slide drives the tool holder so that the tool can move vertically. The X-axis and Z-axis can realize the function of a CNC lathe by linkage.

[0046] In this embodiment, a counterweight 19 is also arranged on the turntable seat 10, and the counterweight 19 is symmetrically arranged with the dual-axis servo mechanism 13, and is used to balance the weight of the X-axis and Z-axis components. In actual operation, the spindle turntable 8 drives the X-axis, Z-axis components and the counterweight 19 to rotate and move as a whole, and the base 5 and the drive motor 7 do not rotate. In this embodiment, the drive motor 7 is installed on the outside of the base 5 and below the spindle turntable 8, which can also increase the weight of the base 5 to a certain extent, thereby improving its stability, playing the role of stabilizing the counterweight in the center, ensuring the reliability and support of the base 5, and further improving the safety and stability of the equipment.

[0047] In this embodiment, a dust cover 20 is also installed on the moving parts of the body, specifically, a dust cover 20 is provided on the X-axis servo system 14, the Z-axis servo system 15, the spindle turntable 8 and other structures to reduce the entry of dust and impurities, avoid blockage and wear, effectively increase the service life and reduce the failure rate.

[0048] In this embodiment, since the control system part of the outdoor processing equipment needs to remain relatively fixed with the machine body, it is often set as one with the machine body due to the connection requirements, resulting in a complex overall structure and a large volume, which is difficult to meet the requirements of lightweight and easy to move, and there is a problem of limited use. However, this solution cleverly adopts a conductive ring structure, connects the cable to the fixed ring of the conductive ring, and connects the machine body to the dynamic ring of the conductive ring, thereby realizing a separate design of the machine body and the control system, and perfectly solves the contradiction between "moving" and "not moving", and can reasonably arrange the cables inside the machine body inside the machine body, thereby simplifying the entire machine body structure and internal circuit structure, reducing the overall weight while ensuring its stability and operating efficiency, making it lighter, more mobile, and easy to move and carry, while reducing restrictions on the use and installation scenarios, and using a wider range of scenarios.

[0049] Embodiment 2

[0050] In this embodiment, a method for processing an open-mouth plugging piece using an outdoor CNC machine tool is provided. Figure 5 As shown, the following steps are included:

[0051] S1, determining the position of the cutting point of the tube 1 to be processed according to the environment where the tube 1 to be processed is located.

[0052] In this embodiment, the environment where the pipe 1 to be processed is located can be a complex or special processing site such as the field, a slope, or the sea. According to the processing environment, the position of the cut-off point of the pipe 1 to be processed is determined. In this embodiment, when working on land, the position of the new pipe mouth (i.e., the cut-off point) is required to be at least 1.5m below the ground level, except at sea; it is convenient for construction and maintenance, and also reduces the potential risk of man-made damage or misoperation at the wellhead, and can also protect the integrity and stability of the plugging assembly. And setting it 1.5m below the ground level can reduce the risk of pollution to the ground environment caused by wellhead leakage. If leakage occurs, its pollutants are more easily absorbed and decomposed by the soil, and will not be directly discharged into the atmosphere or water bodies, which helps to maintain the health of water resources and ecological environment. If it is in a special site such as a slope or sea surface, the exposed part of the pipe is the ground level line, and the position and height of the cut-off point are measured to ensure the space required for the operation, which is more convenient for installation, adjustment and disassembly.

[0053] S2, setting the installation position of the processing machine according to the cutting point; first installing the clamping plate on the pipe to be processed according to the installation position, then installing the base and the spindle turntable on the clamping plate, and clamping and fixing them after leveling through the clamping parts.

[0054] After the cutting point is determined, the installation position and installation height of the processing machine 2 are set according to the position of the cutting point. Among them, first, according to the installation position, a clamping disc with a two-petal half structure is installed on the outer wall of the processed pipe 1, and the upper end face of the clamping disc is about 600mm away from the pipe mouth, and it is radially locked. At the same time, it is necessary to pay attention to the same gap between the two half surfaces when locking. In the actual operation process, if it is installed on the ground, the sleepers must be padded between the lower end of the clamp and the ground to prevent the clamp from accidentally slipping, so as to ensure the safety of construction. There are 4 axial adjustment screws on the clamping disc for adjusting the level. After ensuring that the clamping disc is installed stably, the base 5 is installed on the clamping disc. In this embodiment, it is necessary to ensure that the distance between the upper end face of the base 5 and the pipe mouth of the pipe 1 to be processed is 550-650mm. Specifically, the distance between its upper end face and the pipe mouth is 600mm. The base 5 is roughly flat and then installed on the clamping disc. The 4 axial adjustment screws on the clamp are pre-adjusted to make the end face of the main shaft of the processing machine perpendicular to the pipe.

[0055] According to the above method, after the integral lifting base 5 and the spindle turntable 8 are placed on the upper end surface of the clamping plate, horizontal pre-adjustment is performed through four axial adjustment screws on the clamping plate to make the spindle end surface of the processing machine 2 perpendicular to the pipe 1 to be processed.

[0056] In this embodiment, a leveling step is also included, and the leveling step is initial leveling. Initial leveling is in S2, when the processing machine 2 is installed, the rotation center of the processing machine 2 is adjusted by the 8 clamping claws on the base 5 to meet the leveling requirements and complete the clamping and holding of the processed pipe 1. In this embodiment, a magnetic table seat is adsorbed on the tool holder, a dial indicator is used to find the outer circle runout of the pipe, and the rotation center is adjusted by using the 8 locking screws (i.e., 8 clamping claws) on the chassis of the harness, so that the circular runout is less than 0.5mm, and the initial leveling is completed to ensure the stability and accuracy of the operation.

[0057] S3, the control system 4 is electrically connected to the processing machine 2 through the cable 3, and the dual-axis servo mechanism 13 is controlled to drive the tool structure 16 to operate according to the set processing flow.

[0058] In this embodiment, the processing operations include cutting the pipe mouth, processing the outer cone surface, and processing the tapered round thread of API standard. Specifically, the processing flow includes the following sub-steps:

[0059] S3.1, first use a cutting knife to cut out a new pipe mouth at a determined cutting point position. By controlling the movement of the two-axis servo mechanism 13, the cutting of the new pipe mouth is completed.

[0060] In this embodiment, the cutting action is achieved by setting the machine tool itself to rotate and move while the pipe 1 to be processed does not move. This changes the existing operating mode of outdoor vertical processing equipment in which the machine tool does not move and the workpiece to be processed moves. A unique spindle operation mode is adopted to be applicable to the processing scenarios of various wellhead pipes, with a wider range of applications and stronger operability.

[0061] S3.2, perform smooth surface processing on the pipe ends to be processed.

[0062] After completing the cutting of the new pipe mouth, use a smoothing tool to turn the outer periphery of the thread to the set size, and turn a 20mm straight surface at the large end of the cone with the theoretical large diameter to eliminate the possible large error in the outer diameter of the pipe and ensure that the dimensional error of the small end is controlled within ±0.05mm.

[0063] S3.3, thread machining is performed with multiple tools according to the set radial step distance.

[0064] After finishing the smooth surface, switch the tool structure to a thread cutter, and use multiple tools to turn the tapered thread according to the set radial step distances of 0.25, 0.24, 0.19, 0.16, 0.14, 0.14, 0.13, 0.13, 0.13, 0.13, 0.11, and 0.06. In the actual operation, it is also necessary to pay attention to reducing the cutting amount in the last few cuts to reduce the risk of vibration. At the same time, the radial allowance is required to be greater than 0.02mm on one side during finishing.

[0065] In this embodiment, when the dual-axis servo mechanism 13 is specifically controlled to operate, the setting operation is performed through the control system 4. In this embodiment, the host of the control system is integrated with the display, and the machine tool operation panel, that is, the second operation panel, is located below it. The input / output of the system is connected to the IO terminal board through the remote RIO port, and the external input / output components of the device are connected.

[0066] In this embodiment, the control system uses a three-in-one multi-axis driver equipped with three servo motors, which are plugged into the M3 port of the controller through the M3 servo network bus. The handwheel serves as a fine-tuning device for the equipment and is plugged into the MPG port of the controller.

[0067] By allocating the control parameters of the three servo motors, the movement and feed amount of the X-axis servo system 14 and the Z-axis servo system 15 are controlled respectively. For example, the horizontal left and right feed axis is defined as the X-axis, the vertical up and down feed direction is defined as the Z-axis, and the rotation axis of the spindle turntable 8 is defined as the S-spindle. Then, according to the processing requirements, the parameters are configured and the relevant parameters of the X and Z axes are selected to complete the operation parameter setting.

[0068] After completing the parameter setting, set the PLC ladder diagram accordingly to meet the action logic control required for processing, such as working mode selection, feed rate selection, spindle rate selection, handwheel action control, alarm program configuration, processing program start / pause / reset control, auxiliary functions, etc., to complete the system's action coordination and perform processing.

[0069] In this embodiment, before formal processing, trial cutting is required. Specifically, the workpiece is fixed first, the tool position is confirmed with the handwheel, and the cutting starting point coordinates, end point coordinates, rapid speed, feed speed, spindle speed, number of reciprocating cycles, etc. of the X-axis and Z-axis are entered in the processing program window to complete the processing program compilation to ensure the accuracy and stability of the processing.

[0070] S4, after the processing is completed, the processed pipe mouth is inspected, and after it meets the standards, the processing machine is removed and the processed surface of the pipe mouth is cleaned.

[0071] In this embodiment, first visually check whether the outer R of the buckle type is complete. If it is incomplete, it means that the size is not reached. Use a tooth gauge to observe the thread tooth type against the light. If both sides of the tooth type are not transparent, it is qualified. Then use a dial indicator to measure the tooth height. Ensure that the size is 1.81±0.05mm, which is qualified. Finally, the thread ring gauge is adapted. It is best to tighten the ring gauge to the dead point with 3 threads left on the bottom of the pipe. Complete the overall inspection operation. If it is qualified, the processing is completed. If it is unqualified, further processing is required.

[0072] After the operation is completed, the processing machine 2 and the clamping plate are removed in turn, and the processed screw buckle surface is cleaned. The removal operation is convenient, fast and efficient. The cleaning operation mainly includes manually chamfering the small head of the pipe thread with a file to eliminate burrs, and then cleaning the thread buckle surface. To ensure that the plugging component is installed in place and meets the pressure requirements.

[0073] In this embodiment, the CNC machine tool used can not only meet the processing requirements of the API taper circular thread at the wellhead, but can also realize all the processing functions of the CNC lathe by replacing the tool and the CNC program. It is easy and fast to install and operate, and has a wider application scenario, realizing mechanized and automated efficient processing operations.

[0074] Embodiment 3

[0075] In this embodiment, the leveling step also includes dynamic leveling; wherein the dynamic leveling is to monitor and adjust the rotation center of the processing machine 2 in real time in S3. When the processing environment is at the sea surface, although the well pipe deep in the seabed is stable enough, the part of the pipe to be processed located above is still easily affected by the external environment such as wind and waves, resulting in shaking or deviation, which in turn causes errors in the stability and center of the processing machine.

[0076] In this embodiment, in such a processing environment where there are unstable factors, the rotation center of the processing machine is monitored during the processing. When the rotation center deviates from the rotation center of the current processing, it means that the rotation center has changed and is inconsistent with the rotation center of the current processing, which can easily cause the subsequent processed threads to be screwed together. At this time, it is necessary to adjust the locking screw again to ensure the consistency of the rotation center during the processing operation, ensure the stability and accuracy of the processing, and meet the high-precision requirements of thread processing.

[0077] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Suitable for outdoor CNC machine tools with open-mouth plugging parts, characterized by: It comprises a processing machine installed on the pipe mouth to be processed, and a control system connected to the processing machine through a cable; the processing machine comprises a base arranged on the pipe to be processed, a plurality of clamping members are arranged at the bottom of the base, the inner side of the clamping members abuts against the pipe to be processed; a driving motor is arranged on the outer side of the base; a spindle turntable is arranged on the base, the spindle turntable comprises a rotating bearing, the inner ring of the rotating bearing is connected to the base, and a turntable seat is arranged on the outer ring of the rotating bearing; a conductive ring is arranged on the rotating bearing; the conductive ring comprises a fixed ring and a movable ring in rotating contact, the control system is electrically connected to the fixed ring, and the movable ring is electrically connected to the driving motor; a dual-axis servo mechanism is arranged on the turntable seat.

2. The outdoor CNC machine tool suitable for an open port plugging member according to claim 1, characterized in that: The outer side of the outer ring of the rotating bearing is a gear structure, and is meshed with the driving gear on the driving motor.

3. The outdoor CNC machine tool suitable for an open port plugging member according to claim 1, characterized in that: A plurality of contact grooves are arranged on the outer side of the fixed ring; a plurality of contact brushes are arranged on the inner side of the movable ring, and the contact brushes are in rotational contact with the contact grooves.

4. The outdoor CNC machine tool suitable for an open port plugging member according to claim 1, characterized in that: The dual-axis servo mechanism comprises an X-axis servo system arranged on a turntable seat, and a Z-axis servo system arranged on the X-axis servo system; a tool structure is arranged on the Z-axis servo system.

5. The outdoor CNC machine tool suitable for an open port plugging member according to claim 1, characterized in that: The clamping members include eight groups, and are arranged on the base in two layers, upper and lower circles.

6. The outdoor CNC machine tool suitable for an open port plugging member according to claim 1, characterized in that: A counterweight block is also provided on the turntable seat, and the counterweight block is symmetrically arranged with the dual-axis servo mechanism.

7. Suitable for outdoor CNC machine tool processing of open-mouth plugging parts, characterized in that: The outdoor CNC machine tool according to any one of claims 1 to 6 comprises the following steps: Step 1, determining the position of the cutting point of the pipe to be processed according to the environment where the pipe to be processed is located; Step 2, setting the installation position of the processing machine according to the cut-off point; first installing the clamping plate on the tube to be processed according to the installation position, then installing the base and the spindle turntable on the clamping plate, and clamping and fixing them after leveling through the clamping parts; Step 3, electrically connecting the control system to the processing machine through cables, and controlling the dual-axis servo mechanism to drive the tool structure to operate according to the set processing flow; Step 4: After processing is completed, the pipe mouth to be processed is inspected. If it meets the standards, the processing machine is removed and the processed surface of the pipe mouth is cleaned.

8. The outdoor CNC machine tool processing method for an open-mouth plugging member according to claim 7 is characterized in that: The position of the cutting point needs to be at least 1.5m below the ground level; the distance between the upper end surface of the base and the pipe opening of the pipe to be processed is 550-650mm.

9. The outdoor CNC machine tool processing method for an open-mouth plugging member according to claim 7, characterized in that: It also includes a leveling step, which includes initial leveling and dynamic leveling; the initial leveling is in step 2, when the processing machine is installed, the rotation center of the processing machine is adjusted to meet the leveling requirements; the dynamic leveling is in step 3, the rotation center of the processing machine is monitored in real time and adjusted.

10. The outdoor CNC machine tool processing method suitable for an open port plugging piece according to claim 7, characterized in that: In step 3, the processing flow includes the following sub-steps: Step 3.1, cutting out a new pipe opening at the determined cutting point; Step 3.2, smoothing the pipe mouth to be processed; Step 3.3, perform thread processing with multiple tools according to the set radial step distance.

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