Drilling fishing tool

Abstract

A drilling fishing tool comprises a coring bit and a magnetic attraction assembly arranged in the coring bit, the coring bit comprises a middle barrel, an annular cutter is arranged at one end of the middle barrel, and a connector is arranged at the other end of the middle barrel. The magnetic attraction assembly is located on the inner side of the middle cylinder and provided with a second annular check ring, a magnetic attraction part and a first annular check ring from outside to inside along the axis. The magnetic attraction part comprises a plurality of magnets which are annularly arranged at intervals, spacers are annularly arrayed between the adjacent magnets, the contact surfaces of the two sides of each spacer and the magnets are different in height, one side of each spacer is a high end, the other side of each spacer is a low end, the inner surface of the low end is flush with the inner surface of the corresponding magnet, and the inner surface of the high end exceeds the inner surface of the corresponding magnet by the distance of the thickness of one composite sheet. Through the magnets and the spacers which are arranged at intervals, on one hand, magnet cost can be saved, and installation and later maintenance are facilitated; on the other hand, the attracted drill bit composite sheet or drill bit crushing piece can slide by the width of one magnet at most, and the sliding distance on the surface of the magnet is reduced.

Description

Technical Field

[0001] This utility model relates to the field of drilling technology, specifically to a drilling and retrieval tool for soil or rock. Background Technology

[0002] During routine drilling operations, situations may arise such as drill bit composite plates falling off, drill bits being damaged, or foreign metal objects falling into the hole, causing accidents. In order to retrieve these foreign metal objects from the bottom of the hole, special retrieval equipment is required.

[0003] Combining a core drill bit with a magnet is an effective technique for retrieving metallic foreign objects from the bottom of a hole. Magnets can attract magnetic materials such as iron, nickel, and cobalt. When the magnet is combined with the core drill bit, the magnet can attract metallic foreign objects such as composite pieces, iron filings, and steel balls from the bottom of the hole as the drill bit operates.

[0004] Current coring drill bits are combined with magnets in two ways: with internal magnets and with external magnets.

[0005] Built-in magnet: A dedicated magnet mounting slot can be designed inside the core drill bit to fix the magnet inside the drill bit, making the magnet and drill bit an integral unit. This design does not affect the drilling function of the drill bit, while the magnet can continuously attract metal foreign objects during the drilling process.

[0006] External magnet: The magnet is mounted on the outside of the core drill bit, such as on the shank or side of the drill bit. This method facilitates the installation and replacement of magnets, but may affect the balance of the drill bit and drilling accuracy.

[0007] Therefore, existing technologies often use built-in magnets. For example, the patent with application number CN202020771866.3, entitled "Drilling Mechanism," discloses such a built-in magnet.

[0008] However, a problem with using built-in magnets for retrieval is that after the magnet attracts the drill bit composite piece, as the drill bit rotates and drills, the drill bit composite piece or drill bit fragments will slide on the magnet surface, thus scratching the magnet surface. Utility Model Content

[0009] To address the technical problems mentioned above and reduce the sliding distance of drill bit composite pieces or drill bit fragments on the magnet surface, this utility model provides a drilling and retrieval tool.

[0010] The technical solution of this utility model is as follows:

[0011] A drilling and retrieval tool includes a core drill bit and a magnetic suction assembly disposed inside it. The core drill bit includes a middle cylinder, one end of which is provided with an annular cutter, and the other end of which is provided with a connector.

[0012] The magnetic attraction component is located inside the middle cylinder, and along the axis from the outside to the inside are respectively provided a second annular retaining ring, a magnetic attraction part and a first annular retaining ring;

[0013] The magnetic attraction part includes several magnets arranged in a ring at intervals. There are spacers in a ring array between adjacent magnets. The two sides of the spacer have different heights in contact with the magnet. One side is the high end and the other side is the low end. The inner surface of the low end is flush with the inner surface of the magnet, and the inner surface of the high end extends beyond the inner surface of the magnet by a distance equal to the thickness of a composite sheet.

[0014] The number of magnets should not be too many; 3-5 are sufficient for quick installation. During installation, a small sleeve can be inserted into the middle of the cylinder to prevent the magnets from tipping over and falling out, further aiding in rapid installation.

[0015] By using spaced magnets and spacers, the cost of magnets can be saved, and installation and maintenance can be made easier. On the other hand, the adsorbed drill bit composite or drill bit fragments can slide at most the width of one magnet, reducing the sliding distance on the magnet surface.

[0016] Preferably, the magnet has an arc-shaped structure with both end faces pointing towards the central axis of the middle cylinder, and the radius of the outer side is matched with the inner diameter of the middle cylinder.

[0017] The spacer also adopts an arc-shaped structure, with both end faces pointing towards the central axis of the middle cylinder. The outer side radius matches the inner diameter of the middle cylinder, and the inner side transitions from the high end to the low end in an arc, with the center of the arc facing inward.

[0018] In this way, the contact surfaces of the magnet and the spacer are flush and tightly connected.

[0019] The magnets of the magnetic attraction part are inserted and assembled with the spacers inside the inner cylinder. During installation, they can be inserted one by one along the inner wall of the middle cylinder. After assembly, a tight connection is formed, and then it is pressed tight by the annular retaining ring.

[0020] Regarding the connection method of the annular retaining ring, an internal thread is provided on the inner side of the upper and lower ends of the middle cylinder, which is used to connect the first annular retaining ring and the second annular retaining ring.

[0021] Preferably, two second annular retaining rings are provided, stacked together, which can effectively prevent the magnetic suction assembly from loosening.

[0022] Preferably, the width of the first and second annular retaining rings is greater than the thickness of the magnet, so as to minimize the impact on the magnet.

[0023] The connector is provided with external threads for connecting the drill rod.

[0024] The inner diameter of the ring cutter is not less than the inner diameter of the middle cylinder, which facilitates the insertion of the magnetic suction assembly.

[0025] Through the above design, the drilling and retrieval tool of this utility model improves the traditional integral ring magnet into multiple arc magnets. The spacers with different heights on both sides are set between adjacent magnets. After the magnet attracts the drill bit composite piece or drill bit fragment, the attracting piece can slide at most the width of one magnet, reducing the sliding distance on the magnet surface and thus extending the service life of the magnet.

[0026] Moreover, the cost of distributed magnets is lower than that of monolithic magnets, and when a part is damaged, it can be replaced individually, instead of replacing the whole magnet as in existing technologies. Attached Figure Description

[0027] In the attached diagram:

[0028] Figure 1 This is an external view of the drilling and retrieval tool;

[0029] Figure 2 This is a cross-sectional view of the middle cylinder;

[0030] Figure 3 A top view showing the location of the magnet;

[0031] The components represented by the various reference numerals in the diagram are:

[0032] 1. Core drill bit; 11. Ring cutter; 12. Middle cylinder; 13. Connector; 2. Magnetic suction assembly; 21. First annular retaining ring; 22. Magnet; 23. Spacer; 24. Second annular retaining ring. Detailed Implementation

[0033] See Figures 1-3 This embodiment provides a drilling and retrieval tool, including a core drill bit 1 and a magnetic suction assembly 2 disposed inside it. The core drill bit 1 includes a middle cylinder 12, see [link to documentation]. Figure 1 As shown, the upper end of the middle cylinder 12 is provided with a ring cutter 11, and the lower end is provided with a connector 13.

[0034] The connector 13 is provided with external threads for connecting the drill rod. The annular cutter 11 is used to remove material only from the periphery of the hole, while leaving the center intact, thereby optimizing the drilling process. During drilling, the drill bit can reach deep into the hole, allowing the magnet to contact metallic foreign objects at the bottom of the hole.

[0035] The magnetic suction assembly 2 is located inside the middle cylinder 12. Along the axis from the outside to the inside, there are a second annular retaining ring 24, a magnetic suction part and a first annular retaining ring 21 respectively. The outer side is the side of the annular cutter 11.

[0036] The inner diameter of the ring cutter 11 is not less than the inner diameter of the middle cylinder 12, which facilitates the insertion of the magnetic suction assembly 2.

[0037] The magnetic attraction part includes several magnets 22 arranged in a ring at intervals. Spacers 23 are arranged in a ring array between adjacent magnets 22. The contact surfaces of the spacers 23 with the magnets 22 are at different heights on both sides, with one side being the high end and the other the low end. (See [reference]). Figure 3 As shown, the lower inner surface is flush with the inner surface of magnet 22, and the upper inner surface extends beyond the inner surface of magnet 22 by a distance equal to the thickness of a composite sheet, which is used to intercept the drill bit composite sheet.

[0038] The number of magnets 22 should not be too large, 3-5 is sufficient for quick installation. This embodiment uses 4 magnets. During installation, a small sleeve can also be inserted in the middle of the middle cylinder 12 to prevent the magnets 22 from flipping and falling off, thus assisting in quick installation.

[0039] Preferably, the width of the first annular retaining ring 21 and the second annular retaining ring 24 is greater than the thickness of the magnet 22, so that the magnet can be supported and the magnet 22 can be protected inside, so as to minimize the impact of collisions on the magnet 22.

[0040] This invention, through the spaced magnets 22 and spacers 23, can save the cost of magnets 22 and facilitate installation and subsequent maintenance; on the other hand, it can make the adsorbed drill bit composite piece or drill bit fragment slide at most the width of one magnet 22, reducing the sliding distance on the surface of magnet 22.

[0041] In this embodiment, the magnet 22 is preferably an arc-shaped structure with both end faces pointing towards the central axis of the middle cylinder 12, and the outer side radius matching the inner diameter of the middle cylinder 12.

[0042] The spacer 23 also adopts an arc-shaped structure, with both end faces pointing towards the central axis of the middle cylinder 12. The outer side radius matches the inner diameter of the middle cylinder 12, and the inner side transitions from the high end to the low end in an arc, with the center of the arc facing inward.

[0043] In this way, the contact surfaces of magnet 22 and spacer 23 are flush and tightly connected.

[0044] The magnet 22 of the magnetic attraction part is inserted and assembled with the spacer 23 inside the inner cylinder. During installation, they can be inserted one by one along the inner wall of the middle cylinder 12. After assembly, a tight connection is formed, and then it is pressed tight by the annular retaining ring.

[0045] Regarding the connection method of the annular retaining ring, the inner sides of the upper and lower ends of the middle cylinder 12 are respectively provided with an internal thread for connecting the first annular retaining ring 21 and the second annular retaining ring 24.

[0046] Preferably, two second annular retaining rings 24 are provided and stacked to effectively prevent the magnetic suction component 2 from becoming loose.

[0047] Through the above design, the drilling and retrieval tool of this utility model improves the traditional integral ring magnet 22 into multiple arc magnets 22. The spacers 23 with different heights on both sides are set between adjacent magnets 22. After the magnet 22 attracts the drill bit composite piece or drill bit fragment, the attracting piece can slide at most the width of one magnet 22, reducing the sliding distance on the surface of the magnet 22, thereby extending the service life of the magnet 22.

[0048] Moreover, the cost of the distributed magnet 22 is lower than that of the integral type, and when a part is damaged, it can be replaced individually, instead of replacing the whole unit as in the existing technology.

Claims

1. A drilling and retrieval tool, comprising a core drill bit (1) and a magnetic suction assembly (2) disposed therein, characterized in that, The core drill bit (1) includes a middle cylinder (12), one end of which is provided with an annular cutter (11), and the other end is provided with a connector (13); The magnetic suction assembly (2) is located inside the middle cylinder (12), and is provided with a second annular retaining ring (24), a magnetic suction part and a first annular retaining ring (21) from the outside to the inside along the axis. The magnetic attraction part includes several magnets (22) arranged in a ring at intervals. There are spacers (23) arranged in a ring between adjacent magnets (22). The two sides of the spacer (23) have different contact surfaces with the magnets (22), one side is the high end and the other side is the low end. The inner surface of the low end is flush with the inner surface of the magnet (22), and the inner surface of the high end extends beyond the inner surface of the magnet (22) by a distance equal to the thickness of a composite sheet.

2. The drilling and fishing tool according to claim 1, characterized in that, The magnet (22) has an arc-shaped structure with its two end faces pointing towards the central axis of the middle cylinder (12), and the radius of its outer side is matched with the inner diameter of the middle cylinder (12).

3. The drilling and fishing tool according to claim 2, characterized in that, The spacer (23) has an arc-shaped structure with its two end faces pointing towards the central axis of the middle cylinder (12). The radius of its outer side matches the inner diameter of the middle cylinder (12), and its inner side transitions from the high end to the low end in an arc, with the center of the arc facing inward.

4. A drilling and fishing tool according to any one of claims 1-3, characterized in that, The magnet (22) of the magnetic attraction part is inserted and assembled with the spacer (23) inside the inner cylinder.

5. A drilling and fishing tool according to claim 4, characterized in that, The inner sides of the upper and lower ends of the middle cylinder (12) are respectively provided with a section of internal thread for connecting the first annular retaining ring (21) and the second annular retaining ring (24).

6. A drilling and fishing tool according to claim 5, characterized in that, There are two second annular retaining rings (24), which are stacked.

7. A drilling and fishing tool according to claim 1, characterized in that, The width of the first annular retaining ring (21) and the second annular retaining ring (24) is greater than the thickness of the magnet (22).

8. A drilling and fishing tool according to claim 1, characterized in that, The connector (13) is provided with external threads for connecting the drill rod.

9. A drilling and fishing tool according to claim 1, characterized in that, The inner diameter of the ring cutter (11) is not less than the inner diameter of the middle cylinder (12).

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