Cutting pipe inner cutter with recycling function

Abstract

The utility model discloses a cutting pipe body internal cutter with recovery function, including center shaft, the cutting assembly that is equipped in proper order on center shaft, anchor buffer subassembly, friction centralizing assembly, lower joint and lead cone, is equipped with recovery tray between lower joint and lead cone, the cutting assembly for cutting that is equipped in proper order on the center shaft, and the anchor buffer subassembly of pushing cutter in cutting assembly to spread, and the whole device basic main part that constitutes as the friction centralizing assembly of providing driving force, utilize the recovery tray that lower joint outer joins one, can when the iron filings particle that the blade drop or cut off is too big in the cutting process, the recovery tray that sets up will recover blade or the iron filings that drop, avoid falling to the well bottom and have the accident, the lead cone of setting up in the most lower end, the end face is the inclined plane setting and forms the variable diameter guide cone surface, and the tool is conveniently guided and goes down and enters.

Description

Technical Field

[0001] This utility model relates to the field of mechanical internal cutting tools for oil well workover, and in particular to an internal cutting tool for cutting pipes with a recovery function. Background Technology

[0002] Currently, the main types of pipe cutting tools in China are mechanical and hydraulic. However, a drawback is that during pipe cutting operations, due to differences in pipe material, when encountering harder pipes, significant vibration can cause the cutting tool and other small connecting parts to loosen and fall to the bottom of the well, resulting in downhole accidents or requiring secondary retrieval. Another issue is that large metal fragments cut off may also fall to the bottom of the well. Summary of the Invention

[0003] The purpose of this invention is to provide a cutting blade for a cutting pipe with a recycling function, in order to solve the problem in the prior art where small parts loosen and fall off during processing, causing downhole accidents or requiring secondary retrieval, and large metal fragments cut off also fall to the bottom of the well.

[0004] The technical solution of this utility model is as follows: a cutting blade for a tube with a recycling function, including a central shaft, on which a cutting assembly, an anchoring buffer assembly, a friction straightening assembly, a lower connector and a guide cone are arranged in sequence. The cutting assembly includes a blade holder and a blade. The blade holder is fixedly connected to the outer sidewall of the central shaft, and one end of the blade is rotatably connected to the blade holder.

[0005] A recovery disc is provided between the lower connector and the pilot cone.

[0006] Furthermore, the recycling disc has a recessed collection groove on the end face facing the blade.

[0007] Furthermore, the inner bottom wall of the collection tank is provided with multiple sets of through-hole filters.

[0008] Furthermore, the anchoring buffer assembly includes:

[0009] A cone, which is slidably connected to the outer sidewall of the central shaft and located at the other end of the blade, and a pusher block is provided between the cone and the blade;

[0010] The locator is slidably connected to the outer sidewall of the central shaft, and its open end forms a positioning sliding connection structure with the cone.

[0011] Furthermore, the positioning sliding connection structure includes:

[0012] A limiting protrusion is provided on the cone and engages with the latch;

[0013] A limiting groove is provided on the latch and engages with the cone limiting protrusion, and is slidably connected to the outer side of the limiting protrusion.

[0014] Furthermore, a reset cavity is formed between the cone and the outer sidewall of the central shaft, and a reset spring is provided inside the reset cavity.

[0015] Furthermore, the friction straightening assembly includes:

[0016] A friction base is slidably connected to the outer sidewall of the central shaft. A friction sliding sleeve is provided between the friction base and the outer sidewall of the central shaft. The contact end face of the friction sliding sleeve and the friction base is threaded.

[0017] A friction block is disposed on the outer end face of the friction base, forming a buffer cavity between the friction block and the friction base. Multiple sets of buffer springs are provided inside the buffer cavity.

[0018] The sliding tooth plate is threadedly engaged with the friction sliding tooth sleeve and is located on the opposite side of the friction block.

[0019] Furthermore, a positioning ring is provided between the friction base and the friction sliding sleeve, at the end away from the slip.

[0020] The advantages of this utility model compared with the prior art are as follows: The main body of the device consists of a cutting component for cutting, an anchoring buffer component for pushing the cutting tool in the cutting component to unfold, and a friction straightening component for providing driving force, arranged sequentially on the central axis. A recovery disc is connected to the lower connector. When the blade falls or the cut iron filings are too large during the cutting process, the recovery disc will recover the blade or the fallen iron filings, preventing them from falling to the bottom of the well and causing an accident. The guide cone at the bottom end is set with an inclined end face to form a variable diameter guide cone surface, which facilitates the smooth lowering of the guide tool. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 for Figure 1 Enlarged view at point B in the middle;

[0024] Figure 4 This diagram shows the combined use of the recovery disc and the guide cone in this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0028] See Figure 1-4This utility model discloses a tube-cutting blade with a recycling function, comprising a central shaft 1. A cutting assembly, an anchoring and buffering assembly, a friction-aligning assembly, a lower connector 13, and a guide cone 15 are sequentially mounted on the central shaft. The cutting assembly includes a tool holder 18 and a blade 3. The tool holder 18 is fixedly connected to the outer sidewall of the central shaft 1, and one end of the blade 3 is rotatably connected to the tool holder 18. A recycling disc 14 is provided between the lower connector 13 and the guide cone 15. The recycling disc 14 has a concave collection groove 140 on its end face facing the blade 3. The inner bottom wall of the collection groove 140 has multiple sets of through-holes 1400. One end face of the recycling disc 14 is a concave connecting groove for easy connection with the protruding end of the lower connector 13, and the other end face is a protruding connecting part for connection with the guide cone 15. The two can be connected using a common threaded connection method. In use, the friction-aligning component is used to press and fix the inner side of the pipe to be processed, and the anchoring buffer component is subjected to upward pressure, allowing the cutting component to cut and separate the inner side of the pipe. To ensure that the blade 3 can extend or retract, it is rotatably connected to the tool holder 18 via a rotating shaft 30. The tool holder 18 is fixedly connected to the outer sidewall of the central shaft via a positioning shaft 108, and a leaf spring 18 extending towards the blade 3 is provided on the tool holder 18 to facilitate the retraction of the blade 3. A lower connector 13 is provided, which is connected to the end of the central shaft by a threaded connection. A guide cone 15 is provided, and the end face of the guide cone 15 is set as an inclined surface on the side of the lower connector to guide the tool to enter smoothly. A recovery disc 14 with a collection groove 140 is provided between the connector 13 and the guide cone 15 to collect fallen blades, other small parts, or metal shavings. The bottom of the disc is provided with evenly distributed filter holes 1400 to filter and prevent the accumulation of mud and sand, which would reduce the holding space.

[0029] Specifically, the anchoring buffer assembly includes a cone 5, which is slidably connected to the outer sidewall of the central shaft 1 and located at the other end of the blade 3. A pusher block 4 is provided between the cone 5 and the blade 3. A slip 7 is slidably connected to the outer sidewall of the central shaft 1, with one end open to form a positioning sliding connection structure that cooperates with the cone 5. The positioning sliding connection structure includes a limiting protrusion 17, which is disposed on the cone 5 and cooperates with the slip 7; and a limiting groove 70, which is disposed on the slip 7 and cooperates with the limiting protrusion 17 of the cone 5, and is slidably connected to the outer side of the limiting protrusion 17. A reset cavity 50 is formed between the cone 5 and the outer sidewall of the central shaft 1, and a reset spring 51 is provided inside the reset cavity 50. The friction straightening assembly includes a friction base 9, which is slidably connected to the outer sidewall of the central shaft 1. A friction sliding sleeve 11 is provided between the friction base 9 and the outer sidewall of the central shaft 1, and the contact end face of the friction sliding sleeve 11 with the friction base 9 is threaded. A friction block 10 is disposed on the outer end face of the friction base 9, forming a buffer cavity 90 between the friction block 10 and the friction base 9. Multiple sets of buffer springs 19 are provided inside the buffer cavity 90. The two ends of the friction block 10 can be fixedly connected to the two ends of the friction base 9 by connecting bolts 8. A sliding tooth 16 is threadedly engaged with the friction sliding sleeve 11 and is located on the opposite side of the friction block 10.

[0030] In use, the internal cutter is lowered to the inside of the pipe to be processed, and its central axis rotates clockwise. The contact end face of the friction sliding sleeve 11 with the sliding tooth 16 is engaged with the threaded teeth. The spiral saw teeth rotate and climb, pushing the friction block 10 of the tool to contact the inner wall of the pipe to be cut. The central axis 1 rotates clockwise. Due to the frictional resistance between the friction block 6 and the inner wall of the pipe to be cut (such as a sleeve), the friction support assembly moves upward under the action of the meshing teeth of the spiral saw teeth between the sliding tooth 16 and the friction sliding sleeve 11. This pushes the anchoring buffer assembly to move upward together. Under the action of the limiting protrusion 17 and the limiting groove 70 between the cone 5 and the slip 7, the working outer diameter of the slip 7 of the anchoring buffer assembly gradually expands until it abuts against the inner wall of the pipe to be cut (such as a sleeve) and locks it in place. After the sliding tooth 16 and the friction sliding sleeve 11 continue to rotate, the large spiral saw teeth between the sliding tooth 16 and the friction sliding sleeve 16 inside the friction support assembly completely disengage. The blade 3 is fixed to the inner wall of the pipe (such as a casing) being cut by the slip 7. Simultaneously with the lowering of the blade 3, the anchoring buffer assembly moves upward relative to the pusher block 4, pushing the blade 3 of the cutting assembly to gradually open outward. Under the elastic force of the pusher block 4 and the return spring 51, the central axis of the inner cutter rotates, and the blade 3 on the central axis of the inner cutter can then cut. During the cutting process, if the blade falls off unexpectedly or the cut metal chips are too large, the recovery disc 14 will recover the blade or the fallen metal chips to prevent them from falling to the bottom of the well and causing an accident. After cutting is completed, the tool is lifted, and the friction centering assembly and the anchoring buffer assembly move downward relative to the central axis until they stop against the lower connector. The cutter head retracts, the slip loses its wedging effect, and the cutter can then be pulled out of the well. Any accidentally fallen blades will also be pulled out simultaneously.

[0031] Specifically, a positioning ring 12 is provided between the friction base 9 and the friction sliding sleeve 11, at the end away from the slip 7. The positioning ring 12 and the contact end face of the friction sliding sleeve 11 are engaged with helical teeth to ensure the stability of the friction sliding sleeve 11.

[0032] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A tube-cutting blade with a recyclable function, comprising a central shaft (1), wherein a cutting assembly, an anchoring buffer assembly, a friction straightening assembly, a lower connector (13), and a guide cone (15) are sequentially arranged on the central shaft (1), characterized in that: The cutting assembly includes a tool holder (18) and a blade (3). The tool holder (18) is fixedly connected to the outer sidewall of the central shaft (1), and one end of the blade (3) is rotatably connected to the tool holder (18). A recovery disc (14) is provided between the lower connector (13) and the pilot cone (15).

2. The tube cutter with a recycling function according to claim 1, characterized in that, The recycling tray (14) has a recessed collection groove (140) on the end face facing the blade (3).

3. The tube cutter with a recycling function according to claim 2, characterized in that, The inner bottom wall of the collection tank (140) is provided with multiple sets of internal and external through filter holes (1400).

4. A tube cutter with a recycling function according to claim 1 or 2, characterized in that, The anchoring buffer assembly includes: A cone (5) is slidably connected to the outer sidewall of the central shaft (1) and located at the other end of the blade (3). A pusher block (4) is provided between the cone (5) and the blade (3). The slid (7) is slidably connected to the outer sidewall of the central shaft (1), and its opening at one end forms a positioning sliding connection structure with the cone (5) to cooperate with each other.

5. A tube cutter with a recycling function according to claim 4, characterized in that, The positioning sliding connection structure includes: A limiting protrusion (17) is provided on the cone (5) and cooperates with the slip (7); The limiting groove (70) is disposed on the slip (7) and cooperates with the limiting protrusion (17) of the cone (5), and is slidably connected to the outside of the limiting protrusion (17).

6. The tube cutter with a recycling function according to claim 5, characterized in that, A reset cavity (50) is formed between the cone (5) and the outer sidewall of the central shaft (1), and a reset spring (51) is provided inside the reset cavity (50).

7. A tube cutter with a recycling function according to claim 5, characterized in that, The friction straightening component includes: Friction base (9), the friction base (9) is slidably connected to the outer side wall of the central shaft (1), and a friction sliding sleeve (11) is provided between the friction base (9) and the outer side wall of the central shaft (1). The friction sliding sleeve (11) and the contact end face of the friction base (9) are threaded. Friction block (10), the friction block (10) is disposed on the outer end face of the friction base (9), and a buffer cavity (90) is formed between it and the friction base (9). Multiple sets of buffer springs (19) are provided inside the buffer cavity (90). The sliding tooth plate (16) is threadedly engaged with the friction sliding tooth sleeve (11) and is located on the opposite side of the friction block (10).

8. A tube cutter with a recycling function according to claim 7, characterized in that, A positioning ring (12) is provided between the friction base (9) and the friction sliding sleeve (11), and at the end away from the slip (7).

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