Pipe expanding type screw drill stator forming equipment

Abstract

The invention relates to the technical field of oil exploration, in particular to pipe-expanding type screw drill stator forming equipment which comprises an outer mold structure, an inner mold structure, a pipe-expanding type screw drill stator forming device and a pipe-expanding type screw drill stator forming device. The die sleeve driving structure is connected with the outer die structure and used for driving the outer die structure to rotate along the axis of the outer die structure; the inner mold core penetrates through the outer mold sleeve and is provided with a guide neck expansion section and a molded line section, and an outer molded line is arranged on the outer side of the molded line section; the heating structure is arranged on the front side of the guide neck expanding section; the forming supporting structure is used for supporting the outer mold structure, the mold sleeve driving structure, the inner mold core and the heating structure; in the machining state, a to-be-machined pipe blank is heated through the heating structure, the neck expanding section is guided to expand the diameter, then the pipe blank enters the position between the outer die sleeve and the inner die core, the outer die sleeve is driven to rotate through the die sleeve driving structure, and a stator with inner and outer molded lines is formed under the action of the inner molded line and the outer molded line; the problems that the stator precision is unqualified and the processing efficiency is low due to the fact that deviation is prone to occurring during existing stator forming processing can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil exploration, and particularly relates to a stator forming device for an expandable pipe type positive displacement motor drill Background Art

[0002] A positive displacement motor drill (PDM drill) is a positive displacement downhole motor drill that uses drilling fluid as power to convert liquid pressure energy into mechanical energy. When the mud pumped out by the mud pump flows through the bypass valve and enters the motor, a certain pressure difference is formed at the inlet and outlet of the motor, pushing the rotor to rotate around the axis of the stator, and transmitting the rotational speed and torque to the drill bit through the universal joint shaft and the transmission shaft, thereby realizing the drilling operation.

[0003] The stator is formed by injecting nitrile rubber on the inner wall of a common steel pipe or a steel pipe with an inner spiral cavity. At present, the stator is mainly formed by milling process. During the milling process, it is necessary to continuously control the trajectory of the milling cutter and the position of the stator. The control difficulty is large, and it is easy to deviate, resulting in unqualified stator accuracy and low processing efficiency. Summary of the Invention

[0004] An embodiment of the present invention provides a stator forming device for an expandable pipe type positive displacement motor drill, which can solve the problems of easy deviation resulting in unqualified stator accuracy and low processing efficiency existing in the existing forming process of the stator by milling process.

[0005] An embodiment of the present application provides a stator forming device for an expandable pipe type positive displacement motor drill, including:

[0006] An outer mold structure, including an outer mold sleeve, and the inner side of the outer mold sleeve has an inner profile line;

[0007] A mold sleeve driving structure, connected to the outer mold structure, for driving the outer mold structure to rotate along its axis;

[0008] An inner mold core, passing through the outer mold sleeve, having a guiding neck expansion section and a profile section, and an outer profile line is provided on the outer side of the profile section, and the outer profile line corresponds to the inner profile line;

[0009] A heating structure, provided on the front side of the guiding neck expansion section;

[0010] A forming support structure, for supporting the outer mold structure, the mold sleeve driving structure, the inner mold core and the heating structure;

[0011] In the processing state, the to-be-processed pipe blank enters between the outer mold sleeve and the inner mold core after being heated by the heating structure and expanded by the guiding neck expansion section, and the outer mold sleeve is driven to rotate by the mold sleeve driving structure, and a stator with inner and outer profile lines is formed under the action of the inner profile line and the outer profile line.

[0012] In some embodiments, the outer mold structure includes:

[0013] An outer mold sleeve;

[0014] A sleeve support, provided on the forming support structure;

[0015] A connecting sleeve, rotatably provided in the sleeve support, with one end connected to the mold sleeve driving structure and the other end connected to the outer mold sleeve.

[0016] In some embodiments, the mold sleeve driving structure includes:

[0017] A mold sleeve driving motor, provided on the forming support structure;

[0018] A mold sleeve reducer, connected to the mold sleeve driving motor;

[0019] A driving gear, connected to the output shaft of the mold sleeve reducer;

[0020] A driven gear, meshing with the driving gear on the outside and connected to the connecting sleeve on the inside.

[0021] In some embodiments, the inner mold core further includes a transition section and a disassembly section. The transition section is provided between the guiding necking section and the profiling section, and the disassembly section is connected to the profiling section. Wherein, an internal thread for disassembly is provided at the tail end of the disassembly section.

[0022] In some embodiments, the forming support structure includes:

[0023] A forming bed body;

[0024] A mold core support assembly, provided on the forming bed body, including a support upright seat and support wheels. An installation groove is provided on the support upright seat, and the axle shafts on both sides of the support wheels are embedded in the installation groove.

[0025] In some embodiments, the mold core support assembly further includes a slider and a compression spring provided under the slider. A sliding groove is provided on the side wall of the installation groove, the slider is embedded in the sliding groove, and the axle shaft of the support wheel is located above the slider.

[0026] In some embodiments, the heating structure includes a heating coil and a coil support connected to the heating coil. The coil support is connected to the forming support structure, and the heating coil is provided on the front side of the guiding necking section.

[0027] In some embodiments, the stator forming equipment for the expandable type screw drill also includes:

[0028] The tube blank support mechanism is adjacent to one end of the forming support structure where the heating structure is provided, and has a tube blank positioning structure for installing and moving the tube blank to be processed.

[0029] The tube blank pushing mechanism is adjacent to one end of the tube blank support mechanism away from the forming support structure, and has a pushing actuator for pushing the tube blank to be processed between the outer mold sleeve and the inner mold core.

[0030] In some embodiments, the expanding tube type screw drill stator forming device further includes an automatic disassembly mechanism adjacent to one end of the forming support structure away from the heating structure, and the automatic disassembly mechanism includes:

[0031] An automatic disassembly bed body with a guide groove provided thereon;

[0032] A moving structure including a moving frame and a bracket driving assembly. A guide block is provided at the bottom of the moving frame, and the guide block is embedded in the guide groove. The bracket driving assembly is connected to the moving frame for driving the moving frame to move along the guide groove;

[0033] A stator disassembly structure is provided on the moving frame, including a disassembly driving assembly and a stator disassembly shaft connected to the driving structure. One end of the stator disassembly shaft away from the disassembly driving assembly is provided with a disassembly external thread for connecting with the disassembly internal thread.

[0034] In some embodiments, the automatic disassembly mechanism further includes a tube clamping assembly provided on the forming support structure, and the tube clamping assembly includes:

[0035] At least a pair of clamping blocks;

[0036] A clamping block driving oil cylinder is connected to the clamping block for driving the clamping block to clamp or release the stator.

[0037] Compared with the prior art, in the embodiment of the present application, by arranging an inner profile line on the inner side of the outer mold sleeve and an outer profile line on the outer side of the profile section of the inner mold core, passing the inner mold core through the outer mold sleeve, and arranging the heating structure on the front side of the guiding and necking section of the inner mold core, when in the processing state, the tube blank to be processed is heated by the heating structure under the action of an external force, expanded in the guiding and necking section, and then enters between the outer mold sleeve and the inner mold core, and the outer mold sleeve is driven to rotate by the mold sleeve driving structure, and a stator with inner and outer profile lines is formed under the action of the inner profile line and the outer profile line, which can solve the problems of easy deviation and unqualified stator accuracy and low processing efficiency existing in the prior forming processing of the stator, and improve the processing accuracy and processing efficiency of the stator. Description of the Drawings

[0038] The present invention will be described in more detail below based on embodiments with reference to the accompanying drawings.

[0039] Figure 1 is a perspective view of a stator forming device for an expanding tube type positive displacement motor provided by an embodiment of the present invention;

[0040] Figure 2 is a front view of a stator forming device for an expanding tube type positive displacement motor provided by an embodiment of the present invention;

[0041] Figure 3 is Figure 2 an enlarged view of part A in

[0042] Figure 4 is a schematic structural diagram of an outer mold sleeve provided by an embodiment of the present invention;

[0043] Figure 5 is a schematic structural diagram of an inner mold core provided by an embodiment of the present invention;

[0044] Figure 6 is a schematic structural diagram of a mold core support assembly provided by an embodiment of the present invention.

[0045] Reference numerals:

[0046] 110, outer mold structure; 1101, outer mold sleeve; 1102, connecting sleeve; 1103, sleeve support;

[0047] 120, mold sleeve driving structure; 1201, mold sleeve driving motor; 1202, mold sleeve reducer; 1203, driving gear; 1204, driven gear;

[0048] 130, inner mold core; 1301, guiding neck expansion section; 1302, transition section; 1303, profile section; 1304, disassembly section;

[0049] 1401, heating coil;

[0050] 150, forming support structure; 1501, forming bed; 1502, mold core support assembly; 1502A, support wheel; 1502B, slider; 1502C, compression spring; 1502D, support stand; 1502E, installation groove;

[0051] 20, tube blank support mechanism; 210, support bed; 220, tube blank positioning structure; 2201, tube blank positioning lead screw; 2202, tube blank positioning block; 2203, tube blank support groove; 2204, pressing block;

[0052] 30, tube blank pushing mechanism; 310, pushing bed; 320, pushing execution member;

[0053] 40, automatic disassembly mechanism;

[0054] 410. Automatic disassembly bed; 4101. V-shaped guide groove; 4102. Square guide groove;

[0055] 420. Moving structure; 4201. Moving frame; 4202. Bracket drive assembly; 4202A. Moving drive motor; 4202B. Moving limit plate; 4202C. Moving drive lead screw; 4202D. Moving guide optical rod; 4202E. Moving lead screw box;

[0056] 430. Stator disassembly structure; 4301. Disassembly drive motor; 4302. Disassembly reducer; 4303. Stator disassembly shaft; 4304. Disassembly shaft bracket;

[0057] 440. Pipe clamping assembly; 4401. Clamping block drive oil cylinder; 4402. Clamping block;

[0058] 50. Pipe blank to be processed; 510. Unprocessed stage; 520. Stage of enlarging the inner diameter of the blank pipe; 530. Processing stage. Detailed implementation mode

[0059] The present invention will be further described below with reference to the accompanying drawings.

[0060] During underground drilling operations, a positive displacement motor is required to provide power for the drilling activities to complete the overall drilling work. The core parts of the positive displacement motor are the stator and the rotor, and its working principle is to utilize the formation of multiple mutually different sealed cavities between the rotor and the stator during rotation. The sealed cavities move axially from the suction end to the discharge end direction, causing the medium to move along this path.

[0061] The stator is usually formed by injecting nitrile rubber into the inner wall of a common steel pipe or a steel pipe with an inner spiral cavity. Injecting nitrile rubber into the inner wall of the steel pipe with an inner spiral cavity has better performance. Currently, the main methods for processing the stator are forming processing through milling and electrolysis. Due to the large difficulty in controlling the milling and electrolysis processing processes, problems such as deviation easily occur, resulting in unqualified stator accuracy, and the processing efficiency is low.

[0062] In view of the above technical problems, as Figure 1 、 Figure 2 、 Figure 3 shown, this embodiment provides a stator forming device for an expandable pipe positive displacement motor, including:

[0063] An outer mold structure 110, including an outer mold sleeve 1101, and the inner side of the outer mold sleeve 1101 has an inner profile;

[0064] A mold sleeve drive structure 120, connected to the outer mold structure 110, for driving the outer mold structure 110 to rotate along its axis;

[0065] The inner membrane core 130 is inserted into the outer mold sleeve 1101 and has a guiding neck expansion section 1301 and a mold line section 1303. An outer mold line is provided on the outside of the mold line section 1303, and the outer mold line corresponds to the inner mold line;

[0066] The heating structure is arranged on the front side of the guiding neck expansion section 1301;

[0067] The forming support structure 150 is used to support the outer mold structure 110, the mold sleeve driving structure 120, the inner membrane core 130, and the heating structure;

[0068] In the processing state, the tube blank 50 to be processed is heated by the heating structure and expanded in diameter by the guiding neck expansion section 1301, and then enters between the outer mold sleeve 1101 and the inner membrane core 130. The outer mold sleeve 1101 is driven to rotate by the mold sleeve driving structure 120, and a stator with inner and outer mold lines is formed under the action of the inner mold line and the outer mold line.

[0069] It should be noted that, as Figure 5 shown, the guiding neck expansion section 1301 is a conical structure, and the taper of the cone head of the guiding neck expansion section 1301 is 8 - 12°. If the taper is too large, it is difficult to play the role of gradually expanding the diameter. If the taper is too small, the guiding neck expansion section 1301 will be too long. Among them, the inner mold line of the outer mold sleeve 1101 is processed according to the outer wall mold line of the finished stator, and the outer mold line of the inner membrane core 130 is processed according to the inner wall mold line of the finished stator. Usually, the length of the outer mold sleeve 1101 is less than the length of the inner membrane core 130, and the length of the mold line section 1303 on the inner membrane core 130 is one - half of the stator lead, or it can be other ratios. This application does not make specific limitations on this.

[0070] In some embodiments, the outer mold structure 110 includes:

[0071] The outer mold sleeve 1101;

[0072] The sleeve support 1103 is arranged on the forming support structure 150;

[0073] The connecting sleeve 1102 is rotatably arranged in the sleeve support 1103, one end is connected to the mold sleeve driving structure 120, and the other end is connected to the outer mold sleeve 1101.

[0074] It should be noted that, as Figure 1 、 Figure 2 、 Figure 4 shown, the sleeve support 1103 can be a bearing support, and the outer mold sleeve 1101 can be fixedly connected to the rear end, i.e., the left side, of the connecting sleeve 1102 by screws. When the mold sleeve driving structure 120 drives the connecting sleeve 1102 to rotate, the outer mold sleeve 1101 can be driven to rotate by the connecting sleeve 1102. Among them, the outer mold sleeve 1101 is in a circular ring shape, and the inner side of the outer mold sleeve 1101 has an inner mold line.

[0075] In some embodiments, the die sleeve driving structure 120 includes:

[0076] A die sleeve driving motor 1201, which is arranged on the forming support structure 150;

[0077] A die sleeve reducer 1202, which is connected to the die sleeve driving motor 1201;

[0078] A driving gear 1203, which is connected to the output shaft of the die sleeve reducer 1202;

[0079] A driven gear 1204, whose outer side meshes with the driving gear 1203, and whose inner side is connected to the connecting sleeve 1102.

[0080] It should be noted that the die sleeve reducer 1202 can reduce the output of the die sleeve driving motor 1201 and increase the torque to meet the rotation requirement of the outer die sleeve 1101. Among them, the diameter of the driving gear 1203 is smaller than that of the driven gear 1204 to further reduce the rotation speed of the outer die sleeve 1101 and / or the connecting sleeve 1102. The connecting sleeve 1102 and the inner side of the driven gear 1204 are connected by a key.

[0081] In some embodiments, the inner die core 130 further includes a transition section 1302 and a disassembly section 1304. The transition section 1302 is arranged between the guiding necking section 1301 and the profiling section 1303. The disassembly section 1304 is connected to the profiling section 1303. Among them, a disassembly internal thread is provided at the tail end of the disassembly section 1304.

[0082] It should be noted that the transition section 1302 is a cylindrical smooth rod structure. The diameter of the transition section 1302 is larger than the inner diameter of the to-be-processed tube blank 50 and is consistent with the large diameter of the inner hole of the stator product. On the one hand, this can stabilize the to-be-processed tube blank 50 after being necked by the guiding necking section 1301. On the other hand, when the to-be-processed tube blank 50 is heated and extruded into shape, it can be extruded into a finished stator according to the outer profile line on the inner die core 130 and the inner profile line on the outer die sleeve 1101. Among them, the distance between the outer die sleeve 1101 and the inner die core 130 can be set according to the thickness of the stator product.

[0083] In some embodiments, the forming support structure 150 includes:

[0084] A forming bed body 1501;

[0085] A die core support assembly 1502, which is arranged on the forming bed body 1501 and includes a support upright seat 1502D and a support wheel 1502A. An installation groove 1502E is provided on the support upright seat 1502D, and the wheel shafts on both sides of the support wheel 1502A are embedded in the installation groove 1502E.

[0086] It should be noted that as Figure 1 ,Figure 2 As shown, since the inner mold core 130 is relatively long and is inserted into the outer mold sleeve 1101, it is necessary to support it through the mold core support assembly 1502. Among them, as Figure 3 shown, the transition section 1302 of the inner mold core 130 is located inside the connecting sleeve 1102, the guiding necking section 1301 of the inner mold core 130 extends out of the connecting sleeve 1102, and the right end face of the upper mold line section 1303 on the inner mold core 130 is flush with the right end face of the outer mold sleeve 1101. In this way, after the blank tube 50 to be processed is expanded in diameter through the guiding necking section 1301, inner and outer mold lines can be formed simultaneously at the outer mold sleeve 1101 and the inner mold core 130.

[0087] In some embodiments, as Figure 6 shown, the mold core support assembly 1502 further includes a slider 1502B and a compression spring 1502C arranged below the slider 1502B. A chute is provided on the side wall of the installation groove 1502E. The slider 1502B is embedded in the chute, and the wheel axle of the support wheel 1502A is arranged above the slider 1502B.

[0088] It should be noted that since when processing the blank tube 50 to be processed, the processed part of the blank tube 50 to be processed will gradually extend to the rear side of the outer mold sleeve 1101, that is, Figure 1 、 Figure 2 the left side in, at this time the blank tube 50 to be processed is sleeved on the inner mold core 130, and it is necessary to support the extended blank tube 50 to be processed and the inner mold core 130 simultaneously. By setting the slider 1502B and the compression spring 1502C located below the slider 1502B, the roller can move freely up and down according to the weight it bears to support objects of different weights, ensuring that the blank tube 50 to be processed, the inner mold core 130 and the outer mold sleeve 1101 are coaxially arranged.

[0089] It should be noted that the forming support structure 150 usually includes a plurality of mold core support assemblies 1502. The plurality of mold core support assemblies 1502 are arranged at intervals along the length direction of the forming bed 1501. In this way, when a part of the blank tube 50 to be processed extends out, the mold core support assembly 1502 can automatically adjust the height to support the inner mold core 130 and the inner mold core 130 sleeving the blank tube 50 to be processed at the same time, that is, the mold core support assembly 1502 located at the rear supports the inner mold core 130, and the mold core support assembly 1502 located at the front supports the inner mold core 130 sleeving the blank tube 50 to be processed. In this way, the stability of the support can be ensured, and it is ensured that the blank tube 50 to be processed, the inner mold core 130 and the outer mold sleeve 1101 are coaxially arranged. Among them, the mold sleeve driving structure 120 is located on the right side of the outer mold sleeve 1101, the mold core support assembly 1502 is located on the left side of the outer mold sleeve 1101, and the chute usually extends longitudinally along the installation groove 1502E to guide and limit the displacement of the support wheel 1502A.

[0090] In some embodiments, the heating structure includes a heating coil 1401 and a coil support connected to the heating coil 1401. The coil support is connected to the forming support structure 150, and the heating coil 1401 is disposed on the front side of the guiding necking section 1301.

[0091] It should be noted that the specific form of the coil support is not specifically limited in this application. As long as the heating coil 1401 can be coaxial with the outer mold sleeve 1101, the diameter of the heating coil 1401 can be selected according to actual needs.

[0092] In some embodiments, the stator forming device for an expandable screw drill also includes:

[0093] A billet support mechanism 20, adjacent to one end of the forming support structure 150 where the heating structure is provided, having a billet positioning structure 220. The billet positioning structure 220 is used to install and move the billet 50 to be processed.

[0094] A billet pushing mechanism 30, adjacent to one end of the billet support mechanism 20 away from the forming support structure 150, having a pushing actuator 320. The pushing actuator 320 is used to push the billet 50 to be processed between the outer mold sleeve 1101 and the inner mold core 130.

[0095] It should be noted that as Figure 1 shown, the billet support mechanism 20 is disposed on the right side of the forming support structure 150. The billet support mechanism 20 includes a support bed 210 and a billet positioning structure 220 disposed on the support bed 210. Among them, the billet positioning structure 220 includes:

[0096] A plurality of billet positioning lead screws 2201, the two ends of the billet positioning lead screws 2201 are rotatably connected to the support bed 210;

[0097] A billet positioning block 2202, disposed on the billet positioning lead screw 2201;

[0098] A billet support groove 2203, located above the billet positioning lead screw 2201 and connected to the billet positioning block 2202, for placing the billet 50 to be processed;

[0099] A positioning drive structure, used to drive the billet positioning lead screw 2201 to rotate, thereby moving the billet support groove 2203;

[0100] It should be noted that the tube blank support groove 2203 is a V-shaped groove. A plurality of tube blank positioning lead screws 2201 are arranged at intervals along the length direction of the support bed 210. The tube blank positioning block 2202 can be a nut seat. The tube blank positioning block 2202 can move along with the rotation of the tube blank positioning lead screw 2201, thereby driving the tube blank support groove 2203 to move along the width direction of the support bed 210. The positioning drive structure can be a servo motor and a synchronous belt or synchronous gear connected to the servo motor. The servo motor is arranged at the end of one tube blank positioning lead screw 2201 and meshes with other tube blank positioning lead screws 2201 through a synchronous belt or synchronous gear. When using gear meshing transmission, an idler gear can be set for transmission.

[0101] It should be noted that the tube blank positioning structure 220 further includes a pressing block 2204. Symmetric threaded holes are symmetrically arranged on both sides of the tube blank support groove 2203. The pressing block 2204 is installed on the tube blank positioning groove through bolts and the symmetric threaded holes. The pressing block 2204 has a V-shaped pressing groove, and the V-shaped pressing groove cooperates with the tube blank support groove 2203 to limit the tube blank 50 to be processed. Usually, a plurality of symmetric threaded holes are provided on the tube blank support groove 2203, and a plurality of pressing blocks 2204 are respectively installed at a plurality of symmetric threaded holes to fix the tube blank 50 to be processed.

[0102] It should be noted that after the tube blank 50 to be processed is placed on the tube blank support groove 2203 and the pressing block 2204 is installed, usually, there is a certain rotational clearance between the tube blank 50 to be processed and the V-shaped pressing groove of the pressing block 2204, so that the tube blank 50 to be processed can rotate freely.

[0103] It should be noted that when positioning and moving the tube blank 50 to be processed, first, the tube blank support groove 2203 is moved to the front side or the rear side of the outer mold sleeve 1101 through the positioning drive structure, then the tube blank 50 to be processed is placed on the tube blank support groove 2203, and a plurality of pressing blocks 2204 are installed in sequence. Then, the tube blank support groove 2203 is moved to the central axis through the positioning drive structure, that is, coaxially with the outer mold sleeve 1101, and the installation and positioning of the tube blank 50 to be processed are completed.

[0104] It should be noted that the tube blank pushing mechanism 30 includes a pushing bed 310 and a pushing actuator 320 arranged on the pushing bed 310. The pushing actuator 320 is coaxially arranged with the outer mold sleeve 1101. After the tube blank 50 to be processed is installed and positioned, the pushing actuator 320 can push the tube blank 50 to be processed between the outer mold sleeve 1101 and the inner mold core 130 for forming processing. Among them, the pushing actuator 320 can be a pushing oil cylinder, and the pushing bed 310 can be an oil cylinder bracket.

[0105] In some embodiments, the stator forming device of the expandable type positive displacement motor further includes an automatic disassembly mechanism 40 adjacent to the end of the forming support structure 150 far from the heating structure. The automatic disassembly mechanism 40 includes:

[0106] An automatic disassembly bed body 410, which is provided with a guide groove;

[0107] A moving structure 420, including a moving frame 4201 and a bracket driving assembly 4202. A guide block is provided at the bottom of the moving frame 4201, and the guide block is embedded in the guide groove. The bracket driving assembly 4202 is connected to the moving frame 4201 and is used to drive the moving frame 4201 to move along the guide groove;

[0108] A stator disassembly structure 430 is provided on the moving frame 4201, including a disassembly driving assembly and a stator disassembly shaft 4303 connected to the driving structure. Wherein, a disassembly external thread is provided at one end of the stator disassembly shaft 4303 far from the disassembly driving assembly, and the disassembly external thread is used to connect with the disassembly internal thread.

[0109] It should be noted that, as Figure 1 , Figure 2 shown, the automatic disassembly bed body 410 is arranged on the left side of the forming support structure 150. The guide groove includes a V-shaped guide groove 4101 and a square guide groove 4102. Two support plates are provided on the automatic disassembly bed body 410. A V-shaped guide groove 4101 is provided on one support plate, and a square guide groove 4102 is provided on the other support plate. The guide groove can limit the moving direction of the moving frame 4201 to prevent deviation.

[0110] It should be noted that the bracket driving assembly 4202 includes a moving driving motor 4202A, a moving driving lead screw 4202C connected to the moving starting motor, and a moving lead screw box 4202E threadedly connected to the moving driving lead screw 4202C. Wherein, a moving limit plate 4202B is provided at each end of the moving driving lead screw 4202C, and the moving limit plate 4202B is used to limit the displacement of the moving lead screw box 4202E.

[0111] It should be noted that the bracket driving assembly 4202 further includes two moving guide optical rods 4202D. The moving guide optical rods 4202D pass through the moving lead screw box 4202E, and the two ends of the moving guide optical rods 4202D are respectively connected to the two moving limit plates 4202B, and are used to guide the movement of the moving lead screw box 4202E to prevent deviation during the movement.

[0112] It should be noted that the stator disassembly structure 430 includes a disassembly drive motor 4301, a disassembly reducer 4302, a stator disassembly shaft 4303, and a disassembly shaft support 4304. The disassembly drive motor 4301 is provided on the moving frame 4201. The disassembly drive motor 4301 is connected to the disassembly reducer 4302. The disassembly reducer 4302 is connected to the stator disassembly shaft 4303. The disassembly shaft support 4304 is used to support the stator disassembly shaft 4303.

[0113] In some embodiments, the automatic disassembly mechanism 40 further includes a pipe clamping assembly 440 provided on the forming support structure 150. The pipe clamping assembly 440 includes:

[0114] At least a pair of clamping blocks 4402;

[0115] A clamping block driving oil cylinder 4401, connected to the clamping blocks 4402, for driving the clamping blocks 4402 to clamp or release the stator.

[0116] It should be noted that multiple pairs of clamping blocks 4402 can be arranged along the length direction of the forming support structure 150 to clamp or release the inner film core 130 sleeved with the stator. Wherein, the clamping blocks 4402 are provided with V-shaped card slots. When clamping the stator, the clamping block driving oil cylinder 4401 drives the paired clamping blocks 4402 to move inward synchronously to clamp the stator. When releasing the stator, the clamping block driving oil cylinder 4401 drives the paired clamping blocks 4402 to move outward synchronously to release the stator.

[0117] It should be noted that when performing forming processing on the to-be-processed tube blank 50, the to-be-processed tube blank 50 is placed in the tube blank support groove 2203, the pressing block 2204 is fixed on the tube blank support groove 2203, and then the tube blank support groove 2203 is moved to the coaxial position with the outer mold sleeve 1101 through the tube blank positioning structure 220. The to-be-processed tube blank 50 is pushed to the heating structure by the pushing actuator 320. The to-be-processed tube blank 50 softened by heating through the heating coil 1401 enters between the outer mold sleeve 1101 and the inner film core 130. Under the rotation of the outer mold sleeve 1101, through the cooperation of the inner profile line on the outer mold sleeve 1101 and the outer profile line on the inner film core 130, the to-be-processed tube blank 50 is extruded and formed in the radial direction of the to-be-processed tube blank 50. Wherein, such as Figure 3As shown, the blank tube 50 to be processed can be divided into an unprocessed stage 510, a stage 520 of expanding the inner diameter of the blank tube, and a processing stage 530. With the continuous conveyance of the blank tube 50 to be processed, continuous processing of the tube blank is achieved. The formed tube blank or stator part is sleeved on the polished rod part of the inner die core and supported by a plurality of die core support assemblies 1502. When the pushing actuator 320 pushes the blank tube 50 to be processed to a position close to the front end of the heating coil 1401, the pushing actuator 320 stops operating. At this time, the forming process of one blank tube 50 to be processed is completed. Among them, when moving the tube blank support groove 2203, in-place detection can be performed through sensors or travel switches.

[0118] It should be noted that after the forming process of the blank tube 50 to be processed is completed, the moving frame 4201 can be moved to the tail end of the inner die core 130 by the moving drive motor 4202A. The stator disassembly shaft 4303 is connected to the disassembly internal thread on the inner die core 130 by the disassembly drive motor 4301. Then, the moving drive motor 4202A drives the moving frame 4201 to move away from the outer die sleeve 1101, so as to pull out the inner die core 130 with the stator sleeved thereon from the outer die sleeve 1101.

[0119] It should be noted that after the inner die core 130 with the stator sleeved thereon is pulled out from the outer die sleeve 1101, the pair of clamping blocks 4402 can be driven by the clamping block drive oil cylinder 4401 to clamp the inner die core 130 with the stator sleeved thereon. The disassembly drive motor 4301 drives the stator disassembly shaft 4303 to rotate, so that the stator disassembly shaft 4303 is separated from the inner die core 130 with the stator sleeved thereon. When driving the stator disassembly shaft 4303 to rotate, the moving drive motor 4202A can synchronously drive the moving frame 4201 to move away from the outer die sleeve 1101, and then loosen the clamping of the inner die core 130 with the stator sleeved thereon, and the inner die core 130 with the stator sleeved thereon can be removed from the die core support assembly 1502.

[0120] It should be noted that the removed inner die core 130 with the stator sleeved thereon can be placed on the tube blank support groove 2203 and fixed by the pressing block 2204. Then, a disassembly handle is installed at one end of the inner die core 130, and the inner die core 130 can be removed by rotating the disassembly handle, completing the entire forming process of the stator product.

[0121] In summary, compared with the prior art, in the embodiment of the present application, an inner profile line is arranged on the inner side of the outer mold sleeve 1101, and an outer profile line is arranged on the outer side of the profile section 1303 of the inner mold core 130. The inner mold core 130 is inserted into the outer mold sleeve 1101, and the heating structure is arranged on the front side of the guiding neck-expanding section 1301 of the inner mold core 130. When in the processing state, the to-be-processed tube blank 50 is heated by the heating structure under an external force, expanded in diameter by the guiding neck-expanding section 1301, and then enters between the outer mold sleeve 1101 and the inner mold core 130. The outer mold sleeve 1101 is driven to rotate by the mold sleeve driving structure 120, and a stator with inner and outer profile lines is formed under the action of the inner profile line and the outer profile line, which can solve the problems of easy deviation and unqualified stator accuracy and low processing efficiency existing in the prior art during the forming process of the stator, and improve the processing accuracy and processing efficiency of the stator.

[0122] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through other features therebetween.

[0123] In the description of the present invention, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature.

[0124] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication between two elements inside. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0125] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0126] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An expanding tube type stator forming device for a positive displacement motor, characterized in that, it comprises: An outer mold structure (110), including an outer mold sleeve (1101), and the inner side of the outer mold sleeve (1101) has an inner profile line; A mold sleeve driving structure (120), connected to the outer mold structure (110) for driving the outer mold structure (110) to rotate along its axis; An inner mold core (130), inserted into the outer mold sleeve (1101), having a guiding neck-expanding section (1301) and a profile line section (1303), the outer side of the profile line section (1303) has an outer profile line, and the outer profile line corresponds to the inner profile line; A heating structure, arranged on the front side of the guiding neck-expanding section (1301); A forming support structure (150), used for supporting the outer mold structure (110), the mold sleeve driving structure (120), the inner mold core (130) and the heating structure; In the processing state, the to-be-processed tube blank (50) is heated by the heating structure, expanded by the guiding neck-expanding section (1301), and then enters between the outer mold sleeve (1101) and the inner mold core (130). The outer mold sleeve (1101) is driven to rotate by the mold sleeve driving structure (120), and a stator with inner and outer profile lines is formed under the action of the inner profile line and the outer profile line.

2. The expanding tube type stator forming device for a positive displacement motor according to claim 1, characterized in that, the outer mold structure (110) includes: An outer mold sleeve (1101); A sleeve support (1103), arranged on the forming support structure (150); A connecting sleeve (1102), rotatably arranged in the sleeve support (1103), one end is connected to the mold sleeve driving structure (120), and the other end is connected to the outer mold sleeve (1101).

3. The expanding tube type stator forming device for a positive displacement motor according to claim 2, characterized in that, the mold sleeve driving structure (120) includes: A mold sleeve driving motor (1201), arranged on the forming support structure (150); A mold sleeve reducer (1202), connected to the mold sleeve driving motor (1201); A driving gear (1203), connected to the output shaft of the mold sleeve reducer (1202); A driven gear (1204), the outer side of which is meshed with the driving gear (1203), and the inner side of which is connected to the connecting sleeve (1102).

4. The expanding tube type stator forming device for a positive displacement motor according to claim 1, characterized in that, the inner mold core (130) further includes a transition section (1302) and a disassembly section (1304), the transition section (1302) is arranged between the guiding neck-expanding section (1301) and the profile line section (1303), the disassembly section (1304) is connected to the profile line section (1303), and a disassembly internal thread is provided at the tail end of the disassembly section (1304).

5. The expanding tube type stator forming device for a positive displacement motor according to claim 1, characterized in that, the forming support structure (150) includes: A forming bed (1501); The core support assembly (1502) is disposed on the molding bed (1501) and includes a support pedestal (1502D) and support wheels (1502A). An installation groove (1502E) is provided on the support pedestal (1502D), and the wheel axles on both sides of the support wheels (1502A) are embedded in the installation groove (1502E).

6. The stator forming device for an expandable type screw drill according to claim 5, wherein, the core support assembly (1502) further includes a slider (1502B) and a compression spring (1502C) disposed under the slider (1502B). A sliding groove is provided on the side wall of the installation groove (1502E), the slider (1502B) is embedded in the sliding groove, and the wheel axle of the support wheel (1502A) is disposed above the slider (1502B).

7. The stator forming device for an expandable type screw drill according to claim 1, wherein, the heating structure includes a heating coil (1401) and a coil support connected to the heating coil (1401). The coil support is connected to the molding support structure (150), and the heating coil (1401) is disposed on the front side of the guiding neck expansion section (1301).

8. The stator forming device for an expandable type screw drill according to claim 1, wherein, the stator forming device for an expandable type screw drill further includes: a tube blank support mechanism (20), adjacent to one end of the molding support structure (150) where the heating structure is provided, having a tube blank positioning structure (220) for installing and moving the tube blank (50) to be processed; a tube blank pushing mechanism (30), adjacent to one end of the tube blank support mechanism (20) away from the molding support structure (150), having a pushing actuator (320) for pushing the tube blank (50) to be processed between the outer mold sleeve (1101) and the inner mold core (130).

9. The stator forming device for an expandable type screw drill according to claim 4, wherein, the stator forming device for an expandable type screw drill further includes an automatic disassembly mechanism (40) adjacent to one end of the molding support structure (150) away from the heating structure. The automatic disassembly mechanism (40) includes: an automatic disassembly bed (410) provided with a guiding groove; a moving structure (420), including a moving frame (4201) and a bracket driving assembly (4202). A guiding block is provided at the bottom of the moving frame (4201), the guiding block is embedded in the guiding groove, and the bracket driving assembly (4202) is connected to the moving frame (4201) for driving the moving frame (4201) to move along the guiding groove; The stator disassembly structure (430) is provided on the moving frame (4201) and includes a disassembly driving assembly and a stator disassembly shaft (4303) connected to the driving structure. Wherein, a disassembly external thread is provided at one end of the stator disassembly shaft (4303) away from the disassembly driving assembly, and the disassembly external thread is used to connect with the disassembly internal thread.

10. The expanding tube type screw drill stator forming equipment according to claim 9, characterized in that, the automatic disassembly mechanism (40) further includes a pipe clamping assembly (440) provided on the forming support structure (150), and the pipe clamping assembly (440) includes: at least a pair of clamping blocks (4402); a clamping block driving oil cylinder (4401), connected to the clamping block (4402), and used to drive the clamping block (4402) to clamp or loosen the stator.

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