Multistage universal variable-lead all-metal screw motor

Abstract

The invention relates to a multi-stage universal variable-lead all-metal screw motor which comprises a first-stage screw motor, a second-stage screw motor and a third-stage screw motor, a bearing joint is installed at the output end of the first-stage screw motor, and a drill bit is installed on the bearing joint; the first-stage screw motor, the second-stage screw motor and the third-stage screw motor are sequentially arranged in the direction away from the drill bit. Each of the first-stage screw motor, the second-stage screw motor and the third-stage screw motor comprises a stator and a rotor matched with the stator, and the screw pitches and the leads of the rotors corresponding to the first-stage screw motor, the second-stage screw motor and the third-stage screw motor are gradually reduced; a universal connecting joint for connecting the first-stage screw motor with the second-stage screw motor is arranged between the first-stage screw motor and the second-stage screw motor, and a universal connecting joint is also arranged between the second-stage screw motor and the third-stage screw motor; each universal connecting joint is further provided with a deviation rectifying assembly, and the deviation rectifying assemblies can adjust the angle of the first-stage screw motor and the angle of the second-stage screw motor. The driving device has the effect of better driving the drill bit to work.

Description

Technical Field

[0001] This application relates to the field of deep drilling, and in particular to a multi-stage universal variable lead all-metal screw motor. Background Art

[0002] In deep drilling, a screw motor is required to drive the drill bit for drilling. Common screw motors include a stator and a rotor installed in the stator. A bearing section for installing and connecting the drill bit is installed at the output end of the screw motor, and the drill bit is installed on the bearing section. The bushing of the screw motor is made of rubber material, which is prone to cause gap leakage failure of the screw motor under extreme geological conditions such as high temperature and high pressure. Moreover, due to the single lead of common screw motors, the power of the screw motor is insufficient, and it cannot drive the drill bit to work well. Summary of the Invention

[0003] In order to better drive the drill bit to work, this application provides a multi-stage universal variable lead all-metal screw motor.

[0004] The multi-stage universal variable lead all-metal screw motor provided by this application adopts the following technical solutions: A multi-stage universal variable lead all-metal screw motor includes a first-stage screw motor, a second-stage screw motor, and a third-stage screw motor. A bearing section is installed at the output end of the first-stage screw motor, and a drill bit is installed on the bearing section. The first-stage screw motor, the second-stage screw motor, and the third-stage screw motor are arranged in sequence in a direction away from the drill bit; The first-stage screw motor, the second-stage screw motor, and the third-stage screw motor all include a stator and a rotor adapted thereto. The pitches and leads of the rotors corresponding to the first-stage screw motor, the second-stage screw motor, and the third-stage screw motor gradually decrease; A universal joint for connecting the two is provided between the first-stage screw motor and the second-stage screw motor, and a universal joint is also provided between the second-stage screw motor and the third-stage screw motor; A deviation correction component is also provided at each universal joint, and the deviation correction component can adjust the angle between the first-stage screw motor and the second-stage screw motor.

[0005] By adopting the above technical solution, the first-stage screw motor and the second-stage screw motor are connected in series through a universal joint, so that the stators of the first-stage screw motor and the second-stage screw motor are connected in series and communicated, and the medium can flow in the stators of the two without leakage. The rotors of the first-stage screw motor and the second-stage screw motor are also connected in series; in this way, the second-stage screw motor and the third-stage screw motor are also connected in series; when the drill bit drills, the first-stage threaded rod, the second-stage screw motor and the third-stage screw motor work simultaneously to provide power for the drilling of the drill bit. Since the pitch and lead of the rotors of the first-stage screw motor, the second-stage screw motor and the third-stage screw motor gradually decrease, the principle of series superposition is utilized to increase the output torque of the rotor, which can improve the drilling speed of the drill bit, improve the power of the screw motor, and can better drive the drill bit to work.

[0006] Optionally, the universal joint includes two annular connecting ring plates. The inner diameter of the connecting ring plate is smaller than the outer diameter of the stator. One end of the stator corresponding to the connecting ring plate is cut circumferentially to form a groove adapted to the connecting ring plate. A metal bellows is provided between the two connecting ring plates. Both ends of the bellows are fixed to the corresponding connecting ring plates. The universal joint further includes a universal joint for connecting the two rotors. The universal joint is located in the bellows and the connecting ring plate. The universal joint further includes a connecting member for connecting and fixing the connecting ring plate and the corresponding stator.

[0007] By adopting the above technical solution, taking the series connection of the first-stage screw motor and the second-stage screw motor as an example, when connecting the two in series, the universal joint is connected in series with the two rotors, and then the two connecting ring plates are respectively sleeved on the corresponding ends of the stators. The bellows connects the gaps between the two stators. After the connecting ring plates are installed in place, the connecting member is used to connect and fix the connecting ring plates and the stators; in the above manner, the second-stage screw motor and the third-stage screw motor are connected in series.

[0008] Optionally, the connecting member includes mounting rings fixedly connected to the outer walls of each connecting ring plate. The mounting rings and the connecting ring plates are coaxial. A plurality of bolts are threadedly connected to each mounting ring. The length direction of the bolts is arranged along the radial direction of the connecting ring plate. Each bolt penetrates through the corresponding connecting ring plate and is threadedly connected to the corresponding stator.

[0009] By adopting the above technical solution, after the connecting ring plates are installed in place, each bolt is rotated so that the bolt penetrates through the corresponding connecting ring plate and is threadedly connected to the corresponding stator. At this time, the bolt cooperates with the mounting ring to be able to connect and fix the connecting ring plate and the corresponding stator.

[0010] Optionally, a layer of rubber laminate is wrapped on the inner side wall of the connecting ring plate.

[0011] By adopting the above technical solution, the rubber laminate seals the gap between the connecting ring plate and the stator, improving the sealing performance at the connection between the connecting ring plate and the stator.

[0012] Optionally, the inner diameter of the rubber laminated plate is smaller than the outer diameter of the corresponding end of the stator.

[0013] By adopting the above technical solution, when the connecting ring plate is matched with the stator, the deformation of the rubber laminated plate further seals the gap between the two, further improving the sealing performance at the connection between the connecting ring plate and the stator.

[0014] Optionally, the alignment component includes two pairs of fixing plates. The two pairs of fixing plates are respectively fixedly connected to the corresponding two stators, and the two pairs of fixing plates are close to each other. The two mounting rings of the universal joint corresponding to the alignment component are located between the two pairs of fixing plates, and the fixing plates and the stator are coaxial; The alignment component further includes two lead screws. The axial direction of the lead screws is arranged along the axial direction of the stator. The two lead screws are evenly distributed along the circumferential direction of the stator. Each lead screw penetrates through the corresponding fixing plate and is threadedly connected thereto; The alignment component further includes motors corresponding to the lead screws one by one. The motors are fixed on one end face of the fixing plate, and the motors drive the lead screws to rotate.

[0015] By adopting the above technical solution, when adjusting the inclination direction of the first-stage screw motor, control the two motors to work. The two lead screws rotate and cooperate, so that the two fixing plates can move along the axial direction of the stator, thereby changing the distance between the two fixing plates. By controlling the working time of the motors, the working durations of the two motors are not equal, so that an included angle gradually generates between the two fixing plates, thereby causing the first-stage screw motor to deflect relative to the second-stage screw motor, achieving the purpose of changing the advancing direction of the drill bit; according to the above operation method, the included angle between the second-stage screw motor and the third-stage screw motor can be changed.

[0016] Optionally, the plurality of bolts are evenly distributed along the circumferential direction of the mounting ring.

[0017] By adopting the above technical solution, the connecting ring plate and the stator are more evenly stressed, so that the fixing effect between the two is better.

[0018] Optionally, the stator is provided with mounting grooves corresponding to the pressure rods one by one. The length direction of the mounting grooves is arranged along the radial direction of the stator. Each mounting groove communicates with the corresponding threaded hole. A slider is fixedly connected to the side wall of the pressure rod. A sliding groove corresponding to the slider is provided on the groove wall of the mounting groove. The length direction of the sliding groove is arranged along the radial direction of the stator. The slider is slidably inserted into the sliding groove. A connecting spring is connected to the slider. The end of the connecting spring away from the slider is fixed to the groove wall of the mounting groove. The connecting spring supports the pressure rod, so that the surface of the pressure rod is flush with the outer wall of the stator.

[0019] By adopting the above technical solution, since the inner diameter of the rubber layer plate is not less than the outer diameter of the corresponding end of the stator, it enables the operator to more smoothly sleeved the connecting ring plate and the rubber layer plate on the corresponding end of the stator. After the connecting ring plate and the rubber layer plate are installed in place, when the bolt is screwed into the threaded hole, the screw rod moves to make the transmission component work. The transmission component works to make the pressure rod move outward from the stator, so that the pressure rod gradually presses against the rubber layer plate, causing the rubber layer plate to deform. The deformed rubber layer plate presses against the stator and the connecting ring plate, thereby sealing the gap between the two.

[0020] Optionally, the transmission component includes a driving block slidably connected in the threaded hole. A limiting spring is connected to the bottom wall of the threaded hole. The limiting spring is fixed to the driving block and supports the driving block, so that the driving block is located on the side of the threaded hole close to the outer wall of the stator. The transmission component further includes a transmission block slidably connected to the bottom wall of the installation groove. The sliding direction of the transmission block is arranged along the length direction of the pressure rod. An articulated rod is hinged on the transmission block. One end of the articulated rod away from the transmission block is hinged to the driving block. A transmission rod is also hinged on the transmission block. One end of the transmission rod away from the transmission block is hinged to the pressure rod. The transmission rod and the end of the articulated rod away from the transmission block are inclined in opposite directions. When the driving block is not subjected to external force, the driving block, the pressure rod, the connecting spring, the limiting spring, the articulated rod and the transmission rod cooperate to make the transmission block located in the middle of the installation groove.

[0021] By adopting the above technical solution, rotate the bolt to insert the bolt into the corresponding threaded hole. The bolt moves and pushes the driving block to move towards the bottom of the threaded hole. At the same time, the limiting spring is compressed. The driving block pushes the articulated rod to rotate, so that the articulated rod pushes the transmission block to move away from the bolt. When the transmission block moves, it drives the transmission rod to rotate, so that one end of the transmission rod away from the transmission block moves towards the notch of the installation groove, thereby making the pressure rod move outward from the stator and stretching the connecting spring; as the pressure rod continues to move, the pressure rod presses against the rubber layer plate, thereby causing the rubber layer plate to deform.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: By setting the first-stage screw motor, the second-stage screw motor, the third-stage screw motor, the bearing section, the drill bit, the universal joint and the deviation correction component, the drilling speed of the drill bit can be increased, the power of the screw motor can be improved, and the drill bit can be better driven to work; By setting the connecting ring plate, the universal joint, the corrugated pipe, the installation ring and the bolt, the purpose of connecting the first-stage screw motor, the second-stage screw motor and the third-stage screw motor in series is achieved; By setting the fixing plate, the lead screw and the motor, the traveling direction of the drill bit can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram showing the overall structure of the multi-stage universal variable lead all-metal screw motor in Embodiment 1 of the present application.

[0024] Figure 2 It is a cross-sectional view showing the overall structure of the multi-stage universal variable lead all-metal screw motor in Embodiment 1 of the present application.

[0025] Figure 3 It is a cross-sectional view showing the structure of the universal joint and the deviation correction component in Embodiment 1 of the present application.

[0026] Figure 4 It is a cross-sectional view showing the structure of the connecting piece in Embodiment 1 of the present application.

[0027] Figure 5 It is a cross-sectional view showing the structure of the pressure rod and the transmission component in Embodiment 2 of the present application.

[0028] Figure 6 It is a cross-sectional view showing the connection structure between the driving block and the stator in Embodiment 2 of the present application.

[0029] Figure 7 It shows Figure 6 an enlarged view of the structure at A in

[0030] Figure 8 It is a cross-sectional view showing the structure of the transmission component in Embodiment 2 of the present application.

[0031] Explanation of reference numerals: 1, first-stage screw motor; 2, second-stage screw motor; 3, third-stage screw motor; 4, bearing section; 5, drill bit; 6, stator; 61, mounting groove; 62, sliding groove; 63, connecting groove; 64, sliding slot; 7, rotor; 8, universal joint; 81, connecting ring plate; 82, corrugated pipe; 83, rubber laminated plate; 84, universal joint; 85, connecting piece; 851, mounting ring; 852, bolt; 9, deviation correction component; 91, fixing plate; 92, lead screw; 93, motor; 10, pressure rod; 101, slider; 102, connecting spring; 11, transmission component; 111, driving block; 112, connecting block; 113, limiting spring; 114, transmission block; 115, articulated rod; 116, transmission rod. Detailed implementation manners

[0032] The following further Figure 1-8 describes the present application in detail with reference to the

[0033] Embodiment 1 of the present application discloses a multi-stage universal variable lead all-metal screw motor.

[0034] Embodiment 1 Refer to Figure 1 and Figure 2, including a first-stage screw motor 1, a second-stage screw motor 2, and a third-stage screw motor 3 made of all metal. The three are arranged in sequence in the direction away from the drill bit 5. One end of the first-stage screw motor 1 away from the second-stage screw motor 2 is equipped with a bearing section 4, and one end of the bearing section 4 away from the first-stage screw motor 1 is equipped with a drill bit 5. The first-stage screw motor 1, the second-stage screw motor 2, and the third-stage screw motor 3 all include a stator 6 and a rotor 7 installed in the stator 6, and the pitches and leads of the rotors 7 of the three gradually decrease. A universal joint 8 for connecting the two in series is provided between the first-stage screw motor 1 and the second-stage screw motor 2, and a universal joint 8 for connecting the two in series is also provided between the second-stage screw motor 2 and the third-stage screw motor 3.

[0035] When the multi-stage universal variable lead all-metal screw motor works, the three series-connected rotors 7 provide power for the rotation of the drill bit 5. Since the pitches and leads of the rotors 7 of the first-stage screw motor 1, the second-stage screw motor 2, and the third-stage screw motor 3 gradually decrease, the principle of series superposition is utilized to increase the output torque of the rotor 7 while maintaining a stable rotational speed. This design can significantly improve the mechanical drilling speed, thereby increasing the power of the screw motor and enabling better driving of the drill bit 5 to work.

[0036] Refer to Figure 3 And Figure 4 , taking the universal joint 8 connecting the first-stage screw motor 1 and the second-stage screw motor 2 in series as an example, the universal joint 8 includes two annular connecting ring plates 81. The axial direction of the connecting ring plate 81 is the same as the axial direction of the stator 6. When in use, the two connecting ring plates 81 are sleeved on one end of the two stators 6 close to each other. The outer walls of one end of the two stators 6 close to each other are cut to form a groove adapted to the connecting ring plate 81. The inner diameter of the connecting ring plate 81 is larger than the outer diameter of the grooved end of the stator 6; in order to improve the sealing performance at the connection between the connecting ring plate 81 and the stator 6, a layer of rubber laminate 83 is covered and fixedly connected to the inner wall of the connecting ring plate 81. The inner diameter of the rubber laminate 83 is smaller than the outer diameter of the grooved end of the stator 6. Therefore, when the corresponding ends of the connecting ring plate 81 and the stator 6 are fitted, the rubber laminate 83 deforms to seal the fitting part between the connecting ring plate 81 and the stator 6, reducing the leakage of the medium from the connection between the two.

[0037] A metal bellows 82 is provided between the two connecting ring plates 81. One end face of the bellows 82 is fixed to the corresponding end face of one of the connecting ring plates 81, and the other end of the bellows 82 is fixed to the corresponding end face of the other connecting ring plate 81; the universal joint 8 further includes a universal joint 84 located in the bellows 82 and the connecting ring plate 81. The two connecting ends of the universal joint 84 are respectively fixedly connected to the corresponding rotors 7, thereby connecting the rotors 7 of the first-stage screw motor 1 and the second-stage screw motor 2 in series.

[0038] The universal joint 8 further includes a connecting member 85 for fixing the connecting ring plate 81 to the corresponding stator 6. The connecting member 85 includes a mounting ring 851 fixedly connected to the outer wall of the connecting ring plate 81. The mounting ring 851 is coaxial with the corresponding connecting ring plate 81. A plurality of bolts 852 are threadedly connected to the mounting ring 851 and penetrate through it. The length direction of the bolts 852 is arranged along the radial direction of the mounting ring 851. The bolts 852 penetrate through the corresponding connecting ring plate 81 and are threadedly connected to the corresponding stator 6, so as to achieve the purpose of fixedly connecting the connecting ring plate 81 and the stator 6. In order to better fix the connecting ring plate 81 and the stator 6, make the force between them more uniform, and reduce the occurrence of deformation of the two, the plurality of bolts 852 are evenly distributed along the circumferential direction of the mounting ring 851.

[0039] Referring to Figure 3 With Figure 4 , during deep drilling, in order to correct the running direction of the drill bit 5 and improve the perpendicularity of the drilling path, a deviation correction assembly 9 is provided at each universal joint 8. The angles between the first-stage screw motor 1 and the second-stage screw motor 2 can be adjusted through the deviation correction assembly 9, so that the drill bit 5 can travel at a predetermined angle. Here, the deviation correction assembly 9 at the connection between the first-stage screw motor 1 and the second-stage screw motor 2 is taken as an example for illustration. The deviation correction assembly 9 includes two pairs of fixing plates 91. The two pairs of fixing plates 91 are respectively fixed at the mutually approaching ends of the two stators 6. The two fixing plates 91 of one pair are respectively distributed on the upper and lower sides of the stator 6, and the two mounting rings 851 of the universal joint 8 here are both located between the two pairs of fixing plates 91.

[0040] The deviation correction assembly 9 further includes two lead screws 92. The two lead screws 92 are parallel to each other, and the axial direction of the lead screws 92 is arranged along the axial direction of the stator 6. The two lead screws 92 are evenly distributed along the circumferential direction of the stator 6. The two lead screws 92 are respectively located on the upper and lower sides of the stator 6. The two lead screws 92 simultaneously penetrate through the corresponding two fixing plates 91 and are threadedly connected to the fixing plates 91. On the end face of one of the fixing plates 91 corresponding to the lead screw 92, a motor 93 corresponding to the lead screw 92 is installed. The output shaft of the motor 93 is coaxial with the corresponding lead screw 92, and the output shaft of the motor 93 is fixedly connected to the corresponding lead screw 92.

[0041] When the stators 6 of the first-stage screw motor 1 and the second-stage screw motor 2 are coaxial, the two lead screws 92 cooperate with the corresponding motors 93 to make the end faces of the two pairs of fixing plates 91 close to each other parallel. At this time, the traveling direction of the drill bit 5 is axially consistent with the stators 6 of the first-stage screw motor 1, the second-stage screw motor 2, and the third-stage screw motor 3. When adjusting the inclination direction of the first-stage screw motor 1, control the two motors 93 to work. The two lead screws 92 rotate and cooperate to change the distance between the two pairs of fixing plates 91. By controlling the working time of the motors 93, an included angle gradually generates between the two fixing plates 91, so that the first-stage screw motor 1 deflects relative to the second-stage screw motor 2, achieving the purpose of changing the traveling direction of the drill bit 5.

[0042] The implementation principle of Embodiment 1 of this application is as follows: When connecting the first-stage screw motor 1 and the second-stage screw motor 2, use a universal joint 84 to connect the two rotors 7 in series, and then sleeved the connecting ring plates 81 on the corresponding stators 6 respectively, and rotate the bolts 852 on the mounting ring 851 to make the bolts 852 penetrate the corresponding connecting ring plates 81 and be threadedly connected to the corresponding stators 6. Referring to the above method, the second-stage screw motor 2 and the third-stage screw motor 3 are connected in series.

[0043] After the series connection is completed, install the deviation correction assembly 9 to make the lead screws 92 cooperate with the corresponding fixing plates 91. During the drilling process, when it is necessary to change the inclination angle of the drill bit 5, control the motors 93 to work to make the lead screws 92 rotate, thereby changing the distance between the two fixing plates 91 and making the drilling angle of the drill bit 5 deflect. When the drilling angle of the drill bit 5 reaches the predetermined angle, turn off the two motors 93.

[0044] Embodiment 2 The difference between this embodiment and Embodiment 1 is that, referring to Figure 5 and Figure 6 , the rubber layer plate 83 in this embodiment has a cavity, and the inner diameter of the rubber layer plate 83 is not less than the outer diameter of the grooved end of the stator 6, and the two are adapted, which is convenient for the operator to easily sleeve the connecting ring plate 81 and the rubber layer plate 83 on the grooved end of the stator 6. In order to seal the connecting ring plate 81 and the grooved end of the stator 6, a pressure rod 10 corresponding to the bolt 852 is slidably inserted into the grooved end of the stator 6. The stator 6 is also provided with a transmission assembly 11 for moving the pressure rod 10 to press against the rubber layer plate 83. The pressure rod 10 presses against the rubber layer plate 83 to make the rubber layer plate 83 deform. The deformed rubber layer plate 83 presses against the stator 6 and the connecting ring plate 81 to seal the gap between the two.

[0045] Referring to Figure 5 , Figure 7 and Figure 8, at the threaded holes corresponding to the bolts 852 on the stator 6, mounting grooves 61 are provided. The mounting grooves 61 correspond to the pressure rods 10 one by one. The length direction of the pressure rods 10 is arranged along the axial direction of the stator 6. Each mounting groove 61 communicates with the corresponding threaded hole on the stator 6. The pressure rods 10 are slidably inserted into the corresponding mounting grooves 61. At the end of the pressure rod 10 far from the threaded hole, a slider 101 is fixedly connected to the side wall. On the groove wall of the mounting groove 61, a sliding groove 62 adapted to the slider 101 is provided. The length direction of the sliding groove 62 is arranged along the radial direction of the stator 6. The cooperation between the slider 101 and the sliding groove 62 enables the pressure rod 10 to be slidably engaged with the mounting groove 61; a connecting spring 102 is fixedly connected to the slider 101. The end of the connecting spring 102 far from the slider 101 is fixed to the groove wall at the corresponding end of the sliding groove 62. The connecting spring 102 supports the slider 101 and the pressure rod 10, so that the surface of the pressure rod 10 is flush with the outer wall of the grooved end of the stator 6.

[0046] Referring to Figure 5 and Figure 7 , the transmission assembly 11 includes a driving block 111 slidably inserted into the threaded hole. The side wall of the driving block 111 fits against the hole wall of the threaded hole. A connecting block 112 is fixedly connected to the side wall of the driving block 111. On the hole wall of the threaded hole, connection grooves 63 corresponding to the connecting blocks 112 one by one are provided. The length direction of the connection grooves 63 is arranged along the radial direction of the stator 6. Each connecting block 112 is slidably inserted into the corresponding connection groove 63. The cooperation between the connecting block 112 and the connection groove 63 enables the driving block 111 to slide in the threaded hole; a limiting spring 113 is fixedly connected to the connecting block 112. The telescopic direction of the limiting spring 113 is arranged along the radial direction of the stator 6. The end of the limiting spring 113 far from the connecting block 112 is fixed to the groove wall at the corresponding end of the connection groove 63. The limiting spring 113 supports the connecting block 112 and the driving block 111, so that the driving block 111 is located at one end of the threaded hole close to the outer wall of the stator 6.

[0047] Referring to Figure 5 and Figure 8 , a transmission block 114 is slidably connected to the bottom wall of the mounting groove 61. On the bottom wall of the mounting groove 61, a sliding groove 64 adapted to the transmission block 114 is provided. The length direction of the sliding groove 64 is arranged along the length direction of the mounting groove 61. The transmission block 114 is slidably inserted into the sliding groove 64; a hinge rod 115 hinged to the driving block 111 is hinged to the transmission block 114, and a transmission rod 116 hinged to the pressure rod 10 is also hinged to the transmission block 114. The ends of the hinge rod 115 and the transmission rod 116 far from the transmission block 114 are inclined in opposite directions. When the bolt 852 has not entered the threaded hole, that is, when the driving block 111 is not subjected to an external force, at this time, the connecting spring 102, the limiting spring 113, the hinge rod 115 and the transmission rod 116 cooperate to make the transmission block 114 located in the middle of the sliding groove 64.

[0048] After the connecting ring plate 81 and the rubber layer plate 83 are installed in place, turn the bolt 852 so that the bolt 852 is inserted into the corresponding threaded hole. As the bolt 852 gradually enters the threaded hole, the bolt 852 pushes the driving block 111 towards the bottom of the threaded hole. While the driving block 111 moves, the limiting spring 113 is compressed. The driving block 111 pushes the hinged rod 115 to rotate, causing the hinged rod 115 to push the transmission block 114 to move away from the bolt 852. The transmission block 114 drives the transmission rod 116 to rotate, causing the end of the transmission rod 116 away from the transmission block 114 to move towards the outside of the installation groove 61, thereby moving the pressing rod 10 towards the outside of the stator 6 and stretching the connecting spring 102. As the pressing rod 10 moves, the pressing rod 10 presses against the rubber layer plate 83, causing the rubber layer plate 83 to deform and tightly press against the connecting ring plate 81 and the stator 6, capable of sealing the gap between the connecting ring plate 81 and the stator 6.

[0049] The implementation principle of Embodiment 2 of this application is as follows: Move the connecting ring plate 81 and the rubber layer plate 83 into place so that they cooperate with the stator 6. Then, turn each bolt 852 separately so that the bolt 852 cooperates with the corresponding threaded hole of the stator 6. During the movement of the bolt 852, through the transmission of the driving block 111, the hinged rod 115, the transmission block 114, and the transmission rod 116, the pressing rod 10 moves towards the outside of the stator 6. The movement of the pressing rod 10 causes the rubber layer plate 83 to deform, so that the rubber layer plate 83 tightly presses against the stator 6 and the connecting ring plate 81, sealing the gap between the two.

[0050] The above are all preferred embodiments of this application. Without restricting the protection scope of this application based on this, therefore: All equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A multi-stage universal variable lead all-metal screw motor, characterized in that: The invention comprises a first-stage screw motor (1), a second-stage screw motor (2) and a third-stage screw motor (3), wherein a bearing section (4) is installed at the output end of the first-stage screw motor (1), a drill bit (5) is installed on the bearing section (4), and the first-stage screw motor (1), the second-stage screw motor (2) and the third-stage screw motor (3) are arranged in sequence in a direction away from the drill bit (5); The first-stage screw motor (1), the second-stage screw motor (2) and the third-stage screw motor (3) all comprise a stator (6) and a rotor (7) adapted thereto, and the pitch and lead of the rotor (7) corresponding to the first-stage screw motor (1), the second-stage screw motor (2) and the third-stage screw motor (3) gradually decrease; A universal joint (8) is provided between the first-stage screw motor (1) and the second-stage screw motor (2) for connecting the two, and a universal joint (8) is also provided between the second-stage screw motor (2) and the third-stage screw motor (3); Each universal joint (8) is also provided with a deviation correction component (9), and the deviation correction component (9) is capable of adjusting the angle between the first-stage screw motor (1) and the second-stage screw motor (2).

2. A multi-stage universal variable lead all-metal screw motor according to claim 1, characterized in that: The universal joint (8) comprises two annular connecting ring plates (81), the inner diameter of the connecting ring plates (81) being smaller than the outer diameter of the stator (6), the outer walls of the stator (6) and the connecting ring plates (81) corresponding to one end thereof being cut in annularly to form a groove adapted to the connecting ring plates (81), a metal bellows (82) being provided between the two connecting ring plates (81), both ends of the bellows (82) being fixed to the corresponding connecting ring plates (81), the universal joint (8) further comprising a universal joint (84) for connecting the two rotors (7), the universal joint (84) being located between the bellows (82) and the connecting ring plates (81), and the universal joint (8) further comprising a connecting piece (85) for connecting and fixing the connecting ring plates (81) to the corresponding stator (6).

3. A multi-stage universal variable lead all-metal screw motor according to claim 2, characterized in that: The connecting member (85) comprises a mounting ring (851) fixedly connected to the outer wall of each connecting ring plate (81), the mounting ring (851) being coaxial with the connecting ring plate (81), each mounting ring (851) being threadedly connected to a plurality of bolts (852), the length direction of the bolts (852) being arranged along the radial direction of the connecting ring plate (81), each bolt (852) penetrating the corresponding connecting ring plate (81) and being threadedly connected to the corresponding stator (6).

4. A multi-stage universal variable lead all-metal screw motor according to claim 2 or 3, characterized in that: The inner side wall of the connecting ring plate (81) is wrapped with a layer of rubber layer (83).

5. The multi-stage universal variable lead all-metal screw motor according to claim 4, characterized in that: The inner diameter of the rubber layer (83) is smaller than the outer diameter of the corresponding end of the stator (6).

6. The multi-stage universal variable lead all-metal screw motor according to claim 3, characterized in that: The deviation-correcting assembly (9) comprises two pairs of fixing plates (91), the two pairs of fixing plates (91) are respectively fixedly connected to two corresponding stators (6), and the two pairs of fixing plates (91) are close to each other, two mounting rings (851) of the universal joint (8) corresponding to the deviation-correcting assembly (9) are located between the two fixing plates (91), and the fixing plates (91) and the stators (6) are coaxial; The deviation correction assembly (9) further comprises two lead screws (92), the axial direction of the lead screws (92) being arranged along the axial direction of the stator (6), the two lead screws (92) being evenly distributed along the circumference of the stator (6), and each lead screw passing through a corresponding fixing plate (91) and being threadedly connected thereto; The deviation correcting assembly (9) further comprises a motor (93) corresponding one-to-one to the lead screw (92); the motor (93) is fixed to one of the end faces of the fixing plate (91); and the motor (93) drives the lead screw (92) to rotate.

7. The multi-stage universal variable lead all-metal screw motor according to claim 3, characterized in that: The plurality of bolts (852) are evenly distributed along the circumference of the mounting ring (851).

8. The multi-stage universal variable lead all-metal screw motor according to claim 4, characterized in that: The rubber layer (83) has a cavity, the inner diameter of the rubber layer (83) is not less than the outer diameter of a corresponding end of the stator (6), a pressure rod (10) corresponding to the bolt (852) is slidably inserted on the stator (6), the sliding direction of the pressure rod (10) is arranged along the radial direction of the stator (6), and a transmission component (11) for driving the pressure rod (10) to move is also provided on the stator (6), and the transmission component (11) and the pressure rod (10) are arranged in a one-to-one correspondence.

9. The multi-stage universal variable lead all-metal screw motor according to claim 8, characterized in that: The stator (6) is provided with mounting grooves (61) corresponding to the pressure rods (10) in a one-to-one manner, the length direction of the mounting grooves (61) is arranged along the radial direction of the stator (6), and each mounting groove (61) is communicated with a corresponding threaded hole. A slider (101) is fixedly connected to the side wall of the pressure rod (10), and a slide groove (62) corresponding to the slide groove (101) is provided on the groove wall of the mounting groove (61), the length direction of the slide groove (62) is arranged along the radial direction of the stator (6), and the slide groove (101) is slidably inserted in the slide groove (62). A connecting spring (102) is connected to the slide groove (101), and one end of the connecting spring (102) away from the slide groove (101) is fixed to the groove wall of the mounting groove (61), and the connecting spring (102) supports the pressure rod (10) so that the surface of the pressure rod (10) is flush with the outer wall of the stator (6).

10. The multi-stage universal variable lead all-metal screw motor according to claim 9, characterized in that: The transmission assembly (11) comprises a driving block (111) slidably connected in the threaded hole, a limit spring (113) being connected to the bottom wall of the threaded hole, the limit spring (113) being fixed to the driving block (111) and supporting the driving block (111) so that the driving block (111) is located on a side of the threaded hole close to the outer wall of the stator (6); The transmission assembly (11) further comprises a transmission block (114) slidably connected to the bottom wall of the mounting groove (61); the sliding direction of the transmission block (114) is arranged along the length direction of the pressure rod (10); a hinged rod (115) is hingedly connected to the transmission block (114); one end of the hinged rod (115) away from the transmission block (114) is hingedly connected to the driving block (111); a transmission rod (116) is further hingedly connected to the transmission block (114); one end of the transmission rod (116) away from the transmission block (114) is hingedly connected to the pressure rod (10); and the transmission rod (116) and one end of the hinged rod (115) away from the transmission block (114) are inclined in a direction away from each other; When the driving block (111) is not subjected to an external force, the driving block (111), the pressure rod (10), the connecting spring (102), the limit spring (113), the hinge rod (115) and the transmission rod (116) cooperate to position the driving block (114) in the middle of the installation groove (61).

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