Variable diameter bore centralizer

Abstract

The present application belongs to the technical field of spraying equipment, and particularly relates to a variable-diameter inner hole centralizer, which aims to solve the problem of long replacement time of the centralizer. The present application comprises a central support rod, a fixed sleeve and a moving assembly; the central support rod is in a circular tube type and penetrates through both ends; the fixed sleeve is detachably connected to one end of the central support rod; a fixed rod is hinged to one side end face of the fixed sleeve; the moving assembly comprises a moving sleeve which is sleeved on the central support rod, one side end face of the moving sleeve is hinged with a moving rod, and the moving rod is hinged with the fixed rod; a plurality of fixed rods and moving rods are respectively arranged and are arranged in a circumferential direction along the central support rod; and the moving sleeve can be clamped on the central support rod. The present application can adjust the inner diameter size in real time during the machining process, ensure that the centralizer places the spraying device at the central position of the pipe, and improve the performance and reliability of the whole system.

Description

Technical Field

[0001] This invention belongs to the technical field of spraying equipment, and specifically relates to a variable diameter inner hole centralizer. Background Technology

[0002] Screw drills are commonly used drilling tools, applied for drilling speed enhancement, anti-deviation drilling, directional drilling, directional drilling, and azimuth correction. They are one of the most frequently used downhole tools in drilling engineering today. The pipe inner diameter spraying device is a special piece of equipment used in screw drill production. It is used for spraying rubber-metal adhesive onto the inner surface of stator casings with large length-to-diameter ratios. Its non-standard structure determines its special characteristics. The pipe inner diameter spraying device undertakes the adhesive spraying task for at least 3,500 stator tubes annually for screw drill manufacturers.

[0003] A centralizer is installed at the front end of the cantilever beam structure of the spray nozzle connecting rod. However, due to the different sizes of stator tubes, the centralizer needs to be frequently replaced when stator tubes of different specifications are produced simultaneously. Each replacement of the centralizer takes 10-15 minutes. Based on the current daily production of four specifications of stators, replacing the centralizers on both the A and B spraying systems takes a total of 80-120 minutes, which seriously affects production efficiency. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, namely the long replacement time of the centralizer, the present invention provides a centralizer with a variable diameter inner bore.

[0005] This application discloses a variable-diameter inner bore centralizer, which adopts the following technical solution:

[0006] A variable-diameter inner bore centralizer includes a central support rod, a fixed sleeve, and a movable component;

[0007] The central support rod is a circular tube with both ends connected.

[0008] The fixing sleeve is detachably connected to one end of the central support rod; a fixing rod is hinged to one end face of the fixing sleeve;

[0009] The movable component includes a movable sleeve fitted onto the central support rod, and a movable rod is hinged to one end face of the movable sleeve, the movable rod being hinged to a fixed rod.

[0010] Multiple fixed rods and multiple movable rods are provided, and they are arranged around the central support rod.

[0011] The movable sleeve can be snapped onto the central support rod.

[0012] By adopting the above technical solution, the centralizer is installed on the spray pipe, and a nozzle is installed on the other end. When spraying the inner wall of a stator tube with a larger diameter is required, the moving sleeve is pushed closer to the fixed sleeve, and the hinge point of the fixed rod and the moving rod is moved away from the central support rod, thereby increasing the diameter of the centralizer. The hinge point of the fixed rod and the moving rod supports the nozzle in the stator tube. When it is necessary to reduce the diameter of the centralizer, it is only necessary to move the moving sleeve away from the fixed sleeve, so that the hinge point of the fixed rod and the moving rod is closer to the central support rod, thereby reducing the diameter of the centralizer.

[0013] Optionally, the movable component further includes a sliding sleeve sleeved on the central support rod, the sliding sleeve being rotatably connected to the movable sleeve; a sliding screw is provided on the wall of the sliding sleeve, the sliding screw being threadedly connected to the wall of the sliding sleeve, and the sliding screw penetrating the wall of the sliding sleeve.

[0014] The central support rod is provided with a sliding groove, and multiple sliding grooves are provided. The multiple sliding grooves are arranged at equal intervals along the circumference of the central support rod, and the sliding grooves are also provided along the length of the central support rod. The outer wall of the central support rod is provided with a slot that communicates with the sliding groove. Each sliding groove is connected to multiple slots. The slots are perpendicular to the sliding groove, and the multiple slots on each sliding groove are arranged at intervals along the length of the sliding groove.

[0015] When the sliding sleeve is installed on the central support rod, the end of the sliding screw passes into the groove opened on the central support rod.

[0016] By adopting the above technical solution, the centralizer is installed on the spray pipe, and a nozzle is installed on the other end. When spraying the inner wall of a stator tube with a larger diameter is required, the sliding sleeve is rotated, and the sliding screw on the sliding sleeve slides out of a slot. The sliding sleeve, along with the moving sleeve, is pushed towards the fixed sleeve, causing the sliding sleeve and the moving sleeve to slide along the length of the central support rod. The moving sleeve moves closer to the fixed sleeve, and the hinge between the fixed rod and the moving rod moves away from the central support rod, thereby increasing the diameter of the centralizer. Then, the sliding sleeve is rotated again, and the sliding screw on the sliding sleeve is turned into another slot, restricting the position of the sliding sleeve on the central support rod. The hinge between the fixed rod and the moving rod supports the nozzle in the stator tube. When it is necessary to reduce the diameter of the centralizer, it is only necessary to move the sliding sleeve and the moving sleeve away from the fixed sleeve, so that the hinge between the fixed rod and the moving rod moves closer to the central support rod, thereby reducing the diameter of the centralizer.

[0017] Optionally, a stepped groove is provided on the inner wall of the sliding sleeve, and a plug-in part is provided on one end face of the movable sleeve. After the movable sleeve and the sliding sleeve are installed on the central support rod, the plug-in part on the movable sleeve is inserted into the stepped groove of the sliding sleeve.

[0018] A connecting screw is provided on the sliding sleeve, and the connecting screw penetrates the sleeve wall;

[0019] A circumferential groove is provided on the plug-in part, and the circumferential groove is provided along the circumference of the plug-in part;

[0020] When the movable sleeve and the sliding sleeve are connected together by inserting the connector into the stepped groove, the end of the connecting screw enters the circumferential groove.

[0021] By adopting the above technical solution, the sliding sleeve and the moving sleeve are rotatably connected together, which facilitates the movement of the moving sleeve on the central support rod and adjusts the diameter of the centralizer.

[0022] Optionally, a pivot is provided through the ends of the fixed rod and the movable rod; an enlarged tube is installed at the hinge joint between the movable rod and the fixed rod; the enlarged tube is sleeved on the pivot.

[0023] Optionally, the outer wall of the expanding tube is spherical.

[0024] Optionally, a pin is provided on the fixed rod, and the pin is perpendicularly inserted on the rotating shaft; the pin is arranged outside the hinge point of the moving rod and the fixed rod.

[0025] Optionally, an adjustment hole is provided on the end face of the sliding sleeve opposite to the moving sleeve. The adjustment hole is provided along the length of the sliding sleeve and extends through the sliding sleeve.

[0026] An adjusting spring and a steel ball are arranged in the adjusting hole, and an adjusting screw that is threaded into the adjusting hole is also inserted in the adjusting hole.

[0027] The steel ball, adjusting spring, and adjusting screw are arranged sequentially in the adjusting hole.

[0028] Optionally, a receiving groove is provided on the end face of the plug.

[0029] Optionally, one end of the central support rod is provided with a mounting part, which protrudes along the outer wall of the central support rod; a mounting hole is provided on the mounting part;

[0030] The fixing sleeve is fitted onto the mounting part, and the fixing sleeve is provided with mounting screws that pass through the mounting holes.

[0031] Optionally, the mounting hole is a blind hole.

[0032] The beneficial effects of this invention are:

[0033] (1) The inner diameter of the entire product can be adjusted in real time during processing to ensure that the centralizer places the spraying device in the center of the pipe, thereby improving the performance and reliability of the entire system.

[0034] (2) By adapting to the machining needs of internal holes of different sizes and specifications through the variable diameter design, the versatility and flexibility are enhanced, production preparation time is reduced, and work efficiency is greatly improved.

[0035] (3) It has a simple and easy-to-operate aperture adjustment mechanism, which makes it convenient for operators to quickly adjust according to the inner hole size; the design makes the wear part only the enlarged tube, which can be replaced by removing the pin, thus achieving the effect of simple maintenance, low cost and high efficiency. Attached Figure Description

[0036] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0037] Figure 1 This is a schematic diagram of the variable diameter inner bore centralizer in this embodiment;

[0038] Figure 2 This is a schematic diagram of the central support rod in this embodiment;

[0039] Figure 3 This is a schematic diagram of the fixing sleeve in this embodiment;

[0040] Figure 4 This is a schematic diagram of the sliding sleeve in this embodiment;

[0041] Figure 5 This is a schematic diagram of the movable sleeve in this embodiment.

[0042] Explanation of reference numerals in the attached drawings: 1. Central support rod; 11. Mounting part; 12. Mounting hole; 13. Slide groove; 14. Slot; 2. Fixed sleeve; 21. Fixed groove; 22. Fixed rod; 23. Fixed shaft; 3. Moving component; 31. Sliding sleeve; 311. Step groove; 312. Adjustment hole; 32. Moving sleeve; 321. Insertion part; 322. Circumferential groove; 323. Receiving groove; 324. Moving groove; 33. Moving rod; 34. Moving shaft; 35. Rotating shaft; 36. Enlarging tube. Detailed Implementation

[0043] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] This invention provides a variable diameter inner bore stabilizer, with reference to... Figure 1 The variable diameter inner bore straightener includes a central support rod 1, a fixed sleeve 2, and a moving component 3. The fixed sleeve 2 and the moving component 3 are installed on the central support rod 1. By adjusting the position of the moving component 3 on the central support rod 1, the diameter of the straightener can be adjusted, thus facilitating the adjustment of the diameter of the straightener.

[0046] The central support rod 1 is a round tube with both ends open, which can be connected to the nozzle and the paint tube, so that the paint can pass through the central support rod 1 into the nozzle and be sprayed out through the nozzle to coat the inner wall of the stator tube.

[0047] Reference Figure 1 , Figure 2 A mounting portion 11 is provided at one end of the central support rod 1, protruding along the outer wall of the central support rod 1. A mounting hole 12 is provided on the mounting portion 11 for mounting the fixing sleeve 2. The mounting portion 11 increases the diameter of the central support rod 1 and is used to connect the centralizer to the nozzle. The mounting hole 12 is a blind hole to prevent paint entering the central support rod 1 from leaking out through the mounting hole 12.

[0048] A plurality of sliding grooves 13 are provided on the outer wall of the central support rod 1. The sliding grooves 13 are arranged at equal intervals along the circumference of the central support rod 1 and along the length of the central support rod 1. The initial opening point of the sliding groove 13 is located on the end face of the other end of the central support rod 1. When the moving component 3 is installed on the central support rod 1, the moving component 3 slides along the length of the sliding groove 13 and slides into the sliding groove 13 along the end face of the central support rod 1.

[0049] A slot 14 communicating with a slide groove 13 is formed on the outer wall of the central support rod 1. Each slide groove 13 is connected to multiple slots 14, and the slots 14 are perpendicularly connected to the slide groove 13. The multiple slots 14 on each slide groove 13 are arranged at intervals along the length direction of the slide groove 13. When the moving component 3 slides along the length direction of the slide groove 13, it slides into the slot 14, thus restricting the position of the moving component 3 on the central support rod 1.

[0050] Reference Figure 1 , Figure 3 The fixing sleeve 2 is fitted onto the mounting part 11. A mounting screw passes through the fixing sleeve 2 and is inserted into the mounting hole 12. The mounting screw is threaded into the wall of the mounting hole 12, thus fixing the fixing sleeve 2 onto the mounting part 11, thereby completing the installation of the fixing sleeve 2 on the central support rod 1. The inner wall of the fixing sleeve 2 is in contact with the side of the mounting part 11.

[0051] The length of the fixing sleeve 2 is greater than the length of the mounting part 11. When the fixing sleeve 2 is installed on the central support rod 1, one end face of the fixing sleeve 2 is aligned with the end face of the central support rod 1, and a fixing groove 21 is provided at the other end of the fixing sleeve 2. Multiple fixing grooves 21 are provided and are arranged at equal intervals along the circumference of the fixing sleeve 2. The fixing groove 21 penetrates the wall of the fixing sleeve 2 and communicates with the end face of the fixing sleeve 2. The fixing groove 21 is provided along the length direction of the central support rod 1.

[0052] A fixing rod 22 is installed in the fixing groove 21. One end of the fixing rod 22 is arranged in the fixing groove 21, and a fixing shaft 23 is passed through the fixing sleeve 2. The fixing shaft 23 passes through the fixing rod 22, and the fixing rod 22 is hinged in the fixing groove 21 so that the fixing rod 22 can rotate in the fixing groove 21 with the fixing shaft 23 as the axis. The other end of the fixing rod 22 is connected to the moving component 3.

[0053] Reference Figure 1 The movable component 3 is installed at the other end of the central support rod 1. The movable component 3 includes a sliding sleeve 31, a movable sleeve 32, and a movable rod 33.

[0054] Reference Figure 1 , Figure 4 A sliding sleeve 31 is fitted onto the central support rod 1, with its inner wall fitting against the side of the central support rod 1. A sliding screw is threaded through the wall of the sliding sleeve 31, and when the sliding sleeve 31 is installed on the central support rod 1, the end of the sliding screw enters the groove 13 on the central support rod 1. This allows the sliding sleeve 31 to slide along the central support rod 1, as the sliding sleeve 31 slides along the central support rod 1, with the sliding screw engaging with the groove 13. When the sliding screw rotates the sliding sleeve 31 into the retaining groove 14, the retaining groove 14 is perpendicular to the groove 13, thus restricting the sliding of the sliding sleeve 31 along the length of the central support rod 1.

[0055] A stepped groove 311 is formed on the inner wall of the sliding sleeve 31. The stepped groove 311 communicates with one end face of the sliding sleeve 31. When the sliding sleeve 31 is fitted onto the central support rod 1, the stepped groove 311 faces the fixed sleeve 2. A connecting screw is inserted through the sliding sleeve 31, penetrating the sleeve wall, and the connecting screw is inserted at the stepped groove 311. Both the connecting screw and the sliding screw are inserted from the outside in.

[0056] Reference Figure 1 , Figure 5The movable sleeve 32 is fitted between the fixed sleeve 2 and the sliding sleeve 31, and the inner wall of the movable sleeve 32 is in contact with the side of the central support rod 1. A plug-in portion 321 protrudes from one end face of the movable sleeve 32. After the movable sleeve 32 and the sliding sleeve 31 are installed on the central support rod 1, the plug-in portion 321 on the movable sleeve 32 is inserted into the stepped groove 311 of the sliding sleeve 31. A circumferential groove 322 is provided on the plug-in portion 321. The circumferential groove 322 is opened around the plug-in portion 321. When the movable sleeve 32 and the sliding sleeve 31 are connected together by plugging the plug-in portion 321 into the stepped groove 311, the end of the connecting screw enters the circumferential groove 322, so that the movable sleeve 32 and the sliding sleeve 31 are connected together. When the sliding sleeve 31 slides along the length direction of the central support rod 1, it drives the movable sleeve 32 to slide on the central support rod 1. The circumferential groove 322 on the plug-in portion 321 prevents the movable sleeve 32 from rotating when the sliding sleeve 31 rotates.

[0057] To adjust the tightness of the connection between the movable sleeve 32 and the sliding sleeve 31, and to make the movable sleeve 32 more stable on the central support rod 1 and improve its positioning strength, an adjustment hole 312 is provided on the end face of the sliding sleeve 31 opposite to the movable sleeve 32. The adjustment hole 312 is provided along the length of the sliding sleeve 31 and extends through it. An adjustment spring and a steel ball are arranged in the adjustment hole 312, and an adjustment screw threaded into the adjustment hole 312 is also provided. After connecting the movable sleeve 32 and the sliding sleeve 31, a steel ball and an adjusting spring are placed in the adjusting hole 312. An adjusting screw is then inserted after the adjusting spring is placed. The adjusting spring is positioned between the adjusting screw and the steel ball. The steel ball contacts the movable sleeve 32, causing the adjusting screw to press against the adjusting spring. As the adjusting screw penetrates deeper into the adjusting hole 312, it gradually presses the adjusting spring and pushes it towards the insertion part 321. Under the action of the adjusting spring's own elasticity, the connection between the movable sleeve 32 and the sliding sleeve 31 becomes tighter. Conversely, turning the adjusting screw in the opposite direction loosens the adjusting spring, thus making the connection between the movable sleeve 32 and the sliding sleeve 31 looser. Multiple adjusting holes 312 are arranged at equal intervals along the circumference of the sliding sleeve 31.

[0058] In addition, to prevent the sliding sleeve 31 from rotating too easily due to a tighter connection between the movable sleeve 32 and the sliding sleeve 31, and to prevent the sliding sleeve 31 from rotating automatically on the central support rod 1, a receiving groove 323 is provided on the end face of the insertion part 321. When the movable sleeve 32 stops, the steel ball on the movable sleeve 32 is transferred into the receiving groove 323, changing the friction between the movable sleeve 32 and the sliding sleeve 31 from sliding friction to rotational friction, which facilitates the rotation of the sliding sleeve 31. Moreover, the movement of the steel ball into the receiving groove 323 can limit the automatic rotation of the sliding sleeve 31 on the central support rod 1, thereby making the movable sleeve 32 more stably arranged on the central support rod 1 and improving the positioning strength.

[0059] A movable groove 324 is provided on the other end face of the movable sleeve 32. Multiple movable grooves 324 are provided, and the number of movable grooves 324 corresponds to the number of fixed grooves 21. When the movable sleeve 32 is installed on the central support rod 1, the movable grooves 324 are aligned with the fixed grooves 21.

[0060] One end of the movable rod 33 is inserted into the movable groove 324, and a movable shaft 34 is inserted into the movable sleeve 32. The movable shaft 34 passes through the movable rod 33, and the movable rod 33 is hingedly installed in the movable groove 324, so that the movable rod 33 can rotate in the movable groove 324 with the movable shaft 34 as the axis.

[0061] The other end of the movable rod 33 is hinged to the end of the fixed rod 22. Specifically, a pivot 35 is inserted through the ends of the fixed rod 22 and the movable rod 33, and a pin is inserted through the fixed rod 22. The pin is perpendicularly inserted through the pivot 35 and is arranged outside the hinge point of the movable rod 33 and the fixed rod 22, preventing the pivot 35 from disengaging from the fixed rod 22 and the movable rod 33. As the movable sleeve 32 moves closer to the fixed sleeve 2 along the central support rod 1, the hinge point of the movable rod 33 and the fixed rod 22 gradually moves away from the central support rod 1, thereby expanding the diameter of the centralizer. In use, the hinge point of the movable rod 33 and the fixed rod 22 contacts the inner wall of the stator tube, thereby effectively supporting the nozzle.

[0062] Furthermore, an expanding tube 36 is installed between the fixed rod 22 and the moving rod 33. The expanding tube 36 is sleeved on the rotating shaft 35. The outer wall of the expanding tube 36 is spherical. When the hinge point of the moving rod 33 and the fixed rod 22 contacts the inner wall of the stator tube, the expanding tube 36 increases the contact area with the inner wall of the stator tube, thereby facilitating the support of the nozzle by the centralizer. Moreover, setting the outer wall of the expanding tube 36 to be spherical not only facilitates the support of the nozzle by the centralizer, but also facilitates the movement of the centralizer within the stator tube.

[0063] This application discloses a method for using a variable-diameter inner bore stabilizer: The stabilizer is installed on a spray pipe, and a nozzle is installed on the other end. When it is necessary to spray the inner wall of a stator tube with a larger diameter, the sliding sleeve 31 is rotated, and the sliding screw on the sliding sleeve 31 is slid out of a slot 14, so that the end of the sliding screw enters the slot 13. Then, the sliding sleeve 31 together with the movable sleeve 32 is pushed towards the fixed sleeve 2, so that the sliding sleeve 31 and the movable sleeve 32 slide along the length direction of the central support rod 1. The movable sleeve 32 is close to the fixed sleeve 2, and the hinge of the fixed rod 22 and the movable rod 33 is away from the central support rod 1, thereby expanding the diameter of the stabilizer. Then, the sliding sleeve 31 is rotated again, and the sliding screw on the sliding sleeve 31 is turned into another slot 14, which restricts the position of the sliding sleeve 31 on the central support rod 1. The hinge of the fixed rod 22 and the movable rod 33 supports the nozzle in the stator tube. When it is necessary to reduce the diameter of the centralizer, simply move the sliding sleeve 31 and the moving sleeve 32 away from the fixed sleeve 2, so that the hinge of the fixed rod 22 and the moving rod 33 is closer to the central support rod 1, thereby reducing the diameter of the centralizer. By changing the diameter of the centralizer, the inner diameter of the entire product can be adjusted in real time during the processing, ensuring that the centralizer places the spraying device in the center of the pipe, improving the performance and reliability of the entire system. The variable diameter design of this invention can adapt to the processing requirements of inner holes of different sizes and specifications, greatly improving versatility and flexibility. The centralizer no longer needs to be frequently replaced during production, reducing production preparation time and improving work efficiency. This invention can provide stable support and guidance, effectively reducing the phenomenon of the enlarged tube 36 rubbing against the colloid, thereby improving the stability and consistency of the processing process. This invention has a simple and easy-to-operate hole diameter adjustment mechanism, which allows operators to easily and quickly adjust according to the inner hole size, making operation simple. The only wear part designed in this invention is the enlarged tube 36, which can be replaced simply by removing the pin, making maintenance simple, cost-effective, and efficient.

[0064] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0065] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A variable-diameter inner bore centralizer, characterized in that: It includes a central support rod (1), a fixed sleeve (2), and a moving assembly (3); The central support rod (1) is a circular tube with both ends connected. The fixing sleeve (2) is detachably connected to one end of the central support rod (1); a fixing rod (22) is hinged to one side end face of the fixing sleeve (2); The movable component (3) includes a movable sleeve (32) sleeved on the body of the central support rod (1), and a movable rod (33) is hinged to one end face of the movable sleeve (32), and the movable rod (33) is hinged to the fixed rod (22). Multiple fixed rods (22) and movable rods (33) are provided and arranged around the central support rod (1); The movable sleeve (32) can be snapped onto the central support rod (1); The moving component (3) further includes a sliding sleeve (31) sleeved on the central support rod (1), the sliding sleeve (31) being rotatably connected to the moving sleeve (32); a sliding screw is provided on the cylinder wall of the sliding sleeve (31), the sliding screw being threadedly connected to the cylinder wall of the sliding sleeve (31), and the sliding screw penetrating the cylinder wall of the sliding sleeve (31). The central support rod (1) is provided with a sliding groove (13), and multiple sliding grooves (13) are provided. The multiple sliding grooves (13) are arranged at equal intervals along the circumference of the central support rod (1), and the sliding grooves (13) are opened along the length direction of the central support rod (1). On the outer wall of the central support rod (1), there are slots (14) that communicate with the sliding grooves (13). Each sliding groove (13) is connected to multiple slots (14). The slots (14) are perpendicularly connected to the sliding grooves (13), and the multiple slots (14) on each sliding groove (13) are arranged at intervals along the length direction of the sliding groove (13). When the sliding sleeve (31) is installed on the central support rod (1), the end of the sliding screw is inserted into the groove (13) opened on the central support rod (1); The inner wall of the sliding sleeve (31) is provided with a stepped groove (311), and a plug-in part (321) is provided on one end face of the movable sleeve (32). After the movable sleeve (32) and the sliding sleeve (31) are installed on the central support rod (1), the plug-in part (321) on the movable sleeve (32) is inserted into the stepped groove (311) of the sliding sleeve (31). A connecting screw is provided on the sliding sleeve (31), and the connecting screw penetrates the cylinder wall of the sliding sleeve (31); A circumferential groove (322) is provided on the plug-in part (321), and the circumferential groove (322) is provided along the circumference of the plug-in part (321); When the movable sleeve (32) and the sliding sleeve (31) are connected together by inserting the plug (321) into the stepped groove (311), the end of the connecting screw enters the circumferential groove (322).

2. The variable diameter inner bore centralizer according to claim 1, characterized in that: A rotating shaft (35) is provided on the ends of the fixed rod (22) and the moving rod (33); an enlarging tube (36) is installed at the hinge of the moving rod (33) and the fixed rod (22); the enlarging tube (36) is sleeved on the rotating shaft (35).

3. The variable diameter inner bore centralizer according to claim 2, characterized in that: The outer wall of the enlarged tube (36) is spherical.

4. The variable diameter inner bore centralizer according to claim 2, characterized in that: A pin is provided on the fixed rod (22), and the pin is perpendicularly inserted on the rotating shaft (35); the pin is arranged outside the hinge point of the moving rod (33) and the fixed rod (22).

5. The variable diameter inner bore centralizer according to claim 1, characterized in that: An adjustment hole (312) is provided on the end face of the sliding sleeve (31) opposite to the moving sleeve (32). The adjustment hole (312) is provided along the length of the sliding sleeve (31) and passes through the sliding sleeve (31). An adjusting spring and a steel ball are arranged in the adjusting hole (312), and an adjusting screw that is threadedly connected to the adjusting hole (312) is inserted in the adjusting hole (312); The steel ball, adjusting spring, and adjusting screw are arranged sequentially in the adjusting hole (312).

6. The variable diameter inner bore centralizer according to claim 5, characterized in that: A receiving groove (323) is provided on the end face of the plug-in part (321).

7. The variable diameter inner bore centralizer according to claim 1, characterized in that: One end of the central support rod (1) is provided with a mounting part (11), which protrudes along the outer wall of the central support rod (1); a mounting hole (12) is provided on the mounting part (11); The fixing sleeve (2) is fitted onto the mounting part (11), and the fixing sleeve (2) is provided with mounting screws, which are inserted into the mounting hole (12).

8. The variable diameter inner bore centralizer according to claim 7, characterized in that: The mounting hole (12) is a blind hole.

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