Gravel fishing device

By designing a gravel salvage device that includes a cylinder, a drilling rig connecting bayonet and a gravel anti-detachment device, the problem of difficult gravel is difficult to extract during pile foundation construction, efficient gravel removal is achieved, and construction efficiency and economic benefits are improved.

CN222731511UActive Publication Date: 2025-04-08WUHAN BRIDGE SPECIAL TECH CO LTD CHINA RAILWAY MAJOR BRIDGE ENG BUREAU +1
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Patent Information

Application Number
CN202421425927.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-20
Publication Date
2025-04-08
Estimated Expiration
2034-06-20

AI Technical Summary

Technical Problem

During pile foundation construction, when encountering a sandwich containing gravel, the existing technology is difficult to efficiently extract gravel, resulting in hindering the construction progress and economic losses.

Method used

A gravel salvage device is designed, including a cylinder, a drilling rig connection bayonet and a gravel anti-detachment device. The top plate and connecting steel pipes are installed on the top of the cylinder, and a gravel anti-detachment device of multiple elastic steel wire ropes is welded at the bottom, so that the cylinder can drill the gravel through the elastic steel wire rope during the circulation drilling rig, and remove the gravel by dewetting.

Benefits of technology

The device can efficiently open and remove gravel during the cycle drilling rig, solving the defects in the prior art that the cylinder drilling needs to be removed to bring out gravel, and improving construction efficiency and economic benefits.

✦ Generated by Eureka AI based on patent content.

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Abstract

The broken stone fishing device comprises a cylinder, a drilling machine connecting bayonet and a broken stone anti-falling device, a top plate is installed at one end of the cylinder, a connecting steel pipe is installed on one side of the top plate, and the cylinder and the connecting steel pipe are coaxially arranged; the drilling machine connecting bayonet sleeves one end of the connecting steel pipe; the broken stone anti-falling device is welded to the other end of the cylinder body and comprises a plurality of elastic steel wire ropes, and the elastic steel wire ropes are evenly arranged around the axis of the broken stone anti-falling device. The top plate is mounted at the top of the barrel, the connecting steel pipe is mounted above the top plate, and the drilling machine connecting bayonet sleeves the connecting steel pipe, so that the barrel is connected with the drilling machine for use, the gravel anti-falling device is welded to the barrel, the elastic steel wire ropes are evenly arranged around the axis of the gravel anti-falling device, and the barrel can be expanded through the elastic steel wire ropes to drill gravel; meanwhile, the broken stones can be taken out through the desoldered broken stone anti-falling device, and the technical problem that the broken stones can be taken out of the barrel only by removing a barrel drill when the barrel drill is taken out in the related technology is solved.
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Description

Technical Field

[0001] The present application relates to the technical field of highway engineering, and in particular to a gravel salvaging device. Background Art

[0002] At present, different geological conditions are often encountered in the process of pile foundation construction. Some strata contain gravel interlayers. The drilling of gravel consumes a lot of manpower and time, seriously affecting the construction progress and causing economic losses. The reverse circulation drilling rig cannot extract the gravel, which can easily cause the drill rig to get stuck. The positive circulation drilling rig cannot flush out the gravel, which hinders the drilling of the pile foundation and affects the construction progress.

[0003] In the related art, a stone-removing barrel drill includes a barrel drill body, the top center of the barrel drill body is fixedly connected to the drill rod, a crushed stone carrying out device fixedly connected to the inner wall of the barrel drill body is arranged inside the barrel drill body, and the crushed stone carrying out device includes a long steel wire rope group and a short steel wire rope group arranged alternately, the long steel wire rope group includes a plurality of long steel wire ropes, and the plurality of long steel wire ropes are arranged at annular intervals along the inner wall of the barrel drill body, and the length of the long steel wire rope is greater than the radius of the barrel drill body; the short steel wire rope group includes a plurality of short steel wire ropes, and the plurality of short steel wire ropes are arranged in a ring along the inner wall of the barrel drill body, and the length of the short steel wire rope is less than the radius of the barrel drill body. When the barrel drill rotates, the crushed stone can be squeezed into the gap between the steel wire ropes, but the crushed stone can be brought out of the barrel drill body only by removing the barrel drill.

[0004] Therefore, it is necessary to design a new gravel salvage device. Utility Model Content

[0005] The present application provides a gravel salvaging device, which can solve the technical problem in the related art that the barrel drill must be removed to remove the gravel so that the gravel can be taken out of the barrel drill body.

[0006] In the first aspect, an embodiment of the present application provides a gravel salvage device, which includes: a cylinder, a drilling rig connecting bayonet and a gravel anti-slip device, a top plate is installed at one end of the cylinder, a connecting steel pipe is installed at one side of the top plate, and the cylinder and the connecting steel pipe are coaxially arranged; the drilling rig connecting bayonet is sleeved on one end of the connecting steel pipe; the gravel anti-slip device is welded to the other end of the cylinder, and the gravel anti-slip device includes a plurality of elastic steel wire ropes, and the plurality of elastic steel wire ropes are evenly arranged around the axis of the gravel anti-slip device.

[0007] Wherein, the cylinder can be set as a cylinder, the cavity inside the cylinder can accommodate gravel, the top of the cylinder is installed with the connecting steel pipe through the top plate, the drilling rig connection bayonet is set on one end of the connecting steel pipe, so that the cylinder can be connected with the drilling equipment for use, the bottom of the cylinder can be welded with the gravel anti-slip device, and multiple elastic steel wire ropes are evenly arranged around the axis of the gravel anti-slip device, so that the cylinder can be supported by multiple elastic steel wire ropes to drill gravel during the circulation drilling process, and the gravel can be taken out by unsoldering the gravel anti-slip device, and the welding spacing of the multiple elastic steel wire ropes can be adjusted as needed to salvage gravel of different diameters. In other embodiments, the bottom of the cylinder can be directly welded with multiple elastic steel wire ropes, so that the cylinder can be supported by multiple elastic steel wire ropes to drill gravel during the circulation drilling process, and the gravel can be taken out by unsoldering the multiple elastic steel wire ropes.

[0008] In combination with the first aspect, in one embodiment, the gravel anti-slip device further comprises an anti-slip hoop, the anti-slip hoop is sleeved and welded to the other end of the cylinder, and one side of the anti-slip hoop is provided with a plurality of mounting holes, and a plurality of the elastic steel wire ropes are installed in the plurality of mounting holes. The anti-slip hoop is sleeved and welded to the bottom of the cylinder, and a plurality of the elastic steel wire ropes are installed in the plurality of mounting holes located in the anti-slip hoop, so that the plurality of the elastic steel wire ropes can be firmly installed in the anti-slip hoop, so that the cylinder can be propped open by the plurality of the elastic steel wire ropes to drill gravel during the circulation drilling process, and the gravel can be taken out by unsoldering the anti-slip hoop.

[0009] In combination with the first aspect, in one embodiment, the plurality of elastic steel wire ropes are evenly arranged along the circumferential direction of the anti-dropout hoop, one end of the plurality of elastic steel wire ropes is fixed to the anti-dropout hoop, and the other ends of the plurality of elastic steel wire ropes are gathered at the center of the anti-dropout hoop. Wherein, the plurality of elastic steel wire ropes are evenly arranged along the circumferential direction of the anti-dropout hoop, one end of the plurality of elastic steel wire ropes is fixed to the anti-dropout hoop, and the other ends of the plurality of elastic steel wire ropes are gathered at the center of the anti-dropout hoop, so that the crushed stone can be squeezed to open the plurality of elastic steel wire ropes and enter the internal cavity of the cylinder.

[0010] In combination with the first aspect, in one embodiment, the elastic steel wire rope is made of threaded steel, and the stiffness of the threaded steel is set to 1500-2000MPa. The stiffness of the threaded steel is set to 1500-2000MPa, which can not only make the multiple elastic steel wire ropes deformed by extrusion and stretched, but also make the multiple elastic steel wire ropes restore their shape and effectively support the gravel entering the cylinder. Preferably, the stiffness of the threaded steel can be set to 1770MPa.

[0011] In combination with the first aspect, in one embodiment, the diameter of each of the elastic steel wire ropes is set to 3-4 cm. The diameter of each of the elastic steel wire ropes can be set to 3-4 cm, so that the gap formed by the multiple elastic steel wire ropes is small, so that the gravel entering the cylinder is not easy to leak from the support surface formed by the multiple elastic steel wire ropes.

[0012] In combination with the first aspect, in one embodiment, the top plate is provided with a plurality of drainage holes, and the plurality of drainage holes are connected to the internal cavity of the cylinder. The plurality of drainage holes can be used to discharge water seeping from the internal cavity of the cylinder and excess mud generated during the cyclic drilling process, so that the internal pressure of the cylinder is released.

[0013] In combination with the first aspect, in one embodiment, the diameter of each drainage hole is set to 11-12 cm. The diameter of each drainage hole can be set to 11-12 cm, so that each drainage hole can drain water from the internal cavity of the cylinder and excess mud generated during the circulation drilling process, while ensuring that the gravel entering the cylinder is not easy to escape. Preferably, the diameter of each drainage hole can be set to 10 cm.

[0014] In combination with the first aspect, in one embodiment, a plurality of fixing plates are provided between the connecting steel pipe and the top plate. In this embodiment, the plurality of fixing plates can effectively support the connecting steel pipe to prevent the connecting steel pipe from tilting during the cyclic drilling process, thereby affecting the drilling efficiency.

[0015] In combination with the first aspect, in one embodiment, a plurality of the fixing plates are arranged at equal intervals along the axis of the connecting steel pipe, and a plurality of the fixing plates are arranged perpendicularly to the top plate. Among them, a plurality of the fixing plates can be arranged at equal intervals along the axis of the connecting steel pipe, and a plurality of the fixing plates can be arranged perpendicularly to the top plate, so that the connecting steel pipe is kept upright during the cyclic drilling process, and the drilling rig connection bayonet located on the connecting steel pipe is kept upright, so that the drilling rig installed on the drilling rig connection bayonet is kept upright, and the drilling rig efficiency is prevented from being affected by tilting during the cyclic drilling process.

[0016] In combination with the first aspect, in one embodiment, the gravel salvage device further includes a plurality of drilling rig connection bayonet ports, the inner diameter of each of the drilling rig connection bayonet ports is equal to the outer diameter of the connecting steel pipe, the outer diameters of the plurality of drilling rig connection bayonet ports are different, and the plurality of drilling rig connection bayonet ports are selectively installed on the connecting steel pipe. The inner diameter of each of the drilling rig connection bayonet ports is equal to the outer diameter of the connecting steel pipe, so that each of the drilling rig connection bayonet ports can be installed on the connecting steel pipe without being easily dislodged, and the plurality of drilling rig connection bayonet ports of different outer diameters are selectively installed on the connecting steel pipe, so that the gravel salvage device can match different types of drilling rigs, thereby improving the adaptability of the gravel salvage device.

[0017] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0018] A top plate is installed on the top of the cylinder, a connecting steel pipe is installed above the top plate, and a drilling rig connecting bayonet is sleeved on the connecting steel pipe so that the cylinder and the drilling equipment can be connected for use. A stone crushing anti-slip device is welded on the bottom of the cylinder, and a plurality of elastic steel wire ropes are evenly arranged around the axis of the stone crushing anti-slip device, so that the cylinder can be supported by the plurality of elastic steel wire ropes to drill and extract stone during the circulating drilling process, and the stone crushing anti-slip device can be unsoldered to remove the stone crushing anti-slip device, which solves the technical problem in the related art that the cylinder drill needs to be removed to remove the stone crushing out of the cylinder drill body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a gravel salvage device provided in an embodiment of the present application;

[0021] Figure 2 A top view of a gravel salvaging device provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of the stone chipping prevention device provided in an embodiment of the present application;

[0023] Figure 4 This is a schematic structural diagram of the stone crushing anti-falling device in the expanded state provided in an embodiment of the present application.

[0024] In the figure: 1, cylinder; 2, top plate; 21, drainage hole; 3, connecting steel pipe; 4, drilling rig connection bayonet; 5, gravel anti-slip device; 51, elastic steel wire rope; 52, anti-slip hoop; 521, installation hole; 6, fixing plate. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] The embodiment of the present application provides a gravel salvaging device, which can solve the technical problem that the barrel drill must be removed to remove the gravel from the barrel drill body.

[0027] See also Figure 1 As shown, an embodiment of the present application provides a gravel salvage device, which includes: a cylinder 1, a drilling rig connecting bayonet 4 and a gravel anti-slip device 5, a top plate 2 is installed at one end of the cylinder 1, a connecting steel pipe 3 is installed on one side of the top plate 2, and the cylinder 1 and the connecting steel pipe 3 are coaxially arranged; the drilling rig connecting bayonet 4 is sleeved on one end of the connecting steel pipe 3; the gravel anti-slip device 5 is welded to the other end of the cylinder 1, and the gravel anti-slip device 5 includes a plurality of elastic steel wire ropes 51, and the plurality of elastic steel wire ropes 51 are evenly arranged around the axis of the gravel anti-slip device 5.

[0028] In this embodiment, the cylinder 1 can be set as a cylinder, the cavity inside the cylinder 1 can accommodate gravel, the connecting steel pipe 3 is installed on the top of the cylinder 1 through the top plate 2, the drilling rig connecting bayonet 4 is sleeved on one end of the connecting steel pipe 3, so that the cylinder 1 can be connected with the drilling equipment for use, the gravel anti-slip device 5 can be welded to the bottom of the cylinder 1, and the multiple elastic steel wire ropes 51 are evenly arranged around the axis of the gravel anti-slip device 5, so that the cylinder 1 can be supported by the multiple elastic steel wire ropes 51 to drill gravel during the circulation drilling process, and the gravel can be taken out by desoldering the gravel anti-slip device 5, and the welding spacing of the multiple elastic steel wire ropes 51 can be adjusted as needed to salvage gravel of different diameters. In other embodiments, multiple elastic steel wire ropes 51 can be directly welded to the bottom of the cylinder 1, so that the cylinder 1 can be supported by the multiple elastic steel wire ropes 51 to drill out gravel during the circulation drilling process, and the gravel can be removed by de-welding the multiple elastic steel wire ropes 51.

[0029] In this embodiment, the top plate 2 is installed on the top of the cylinder 1, the connecting steel pipe 3 is installed above the top plate 2, and the drilling rig connecting bayonet 4 is sleeved on the connecting steel pipe 3, so that the cylinder 1 can be connected with the drilling equipment for use, and the stone crushing anti-slip device 5 is welded through the bottom of the cylinder 1, and a plurality of elastic steel wire ropes 51 are evenly arranged around the axis of the stone crushing anti-slip device 5, so that the cylinder 1 can be supported by the plurality of elastic steel wire ropes 51 to drill and extract stone during the circulation drilling process, and the stone crushing anti-slip device 5 can be unsoldered to remove the stone crushing. The technical problem in the related art that the cylinder drill needs to be removed to remove the stone crushing out of the cylinder drill body.

[0030] Further, see Figure 1 and Figure 3 As shown, in some embodiments, the gravel anti-slip device 5 also includes an anti-slip hoop 52, which is sleeved and welded to the other end of the cylinder 1, and a plurality of mounting holes 521 are provided on one side of the anti-slip hoop 52, and a plurality of the elastic steel wire ropes 51 are installed in the plurality of mounting holes 521.

[0031] In this embodiment, the anti-slip hoop 52 is sleeved and welded to the bottom of the cylinder 1, and the multiple elastic steel wire ropes 51 are installed in the multiple installation holes 521 located on the anti-slip hoop 52, so that the multiple elastic steel wire ropes 51 can be firmly installed on the anti-slip hoop 52, so that the cylinder 1 can be supported by the multiple elastic steel wire ropes 51 to drill and extract gravel during the circulation drilling process, and the gravel can be removed by desoldering the anti-slip hoop 52.

[0032] Further, see Figure 3 and Figure 4 As shown, in some embodiments, the plurality of elastic steel wire ropes 51 are evenly arranged along the circumferential direction of the anti-detachment hoop 52 , one end of the plurality of elastic steel wire ropes 51 is fixed to the anti-detachment hoop 52 , and the other ends of the plurality of elastic steel wire ropes 51 converge at the center of the anti-detachment hoop 52 .

[0033] In this embodiment, the plurality of elastic steel wire ropes 51 are evenly arranged along the circumferential direction of the anti-dropout hoop 52, and one end of the plurality of elastic steel wire ropes 51 is fixed to the anti-dropout hoop 52, and the other ends of the plurality of elastic steel wire ropes 51 converge at the center of the anti-dropout hoop 52, so that the gravel can be squeezed to open the plurality of elastic steel wire ropes 51 and enter the internal cavity of the cylinder 1.

[0034] Further, see 3 and Figure 4As shown, in some embodiments, the elastic steel wire rope 51 is made of threaded steel, and the stiffness of the threaded steel is set to 1500-2000MPa. In this embodiment, the stiffness of the threaded steel is set to 1500-2000MPa, which can not only make the multiple elastic steel wire ropes 51 deformed by extrusion and stretched, but also make the multiple elastic steel wire ropes 51 restore their shape and effectively support the gravel entering the cylinder 1. Preferably, the stiffness of the threaded steel can be set to 1770MPa.

[0035] Further, see Figure 1 As shown, in some embodiments, the diameter of each elastic steel wire rope 51 is set to 3-4 cm. In this embodiment, the diameter of each elastic steel wire rope 51 can be set to 3-4 cm, so that the gap formed by the multiple elastic steel wire ropes 51 is small, so that the gravel entering the cylinder 1 is not easy to leak from the support surface formed by the multiple elastic steel wire ropes 51.

[0036] Further, see Figure 1 As shown, in some embodiments, the top plate 2 is provided with a plurality of drainage holes 21, and the plurality of drainage holes 21 are connected to the internal cavity of the cylinder 1. In this embodiment, the plurality of drainage holes 21 can be used to discharge water seeping from the internal cavity of the cylinder 1 and excess mud generated during the cyclic drilling process, so that the internal pressure of the cylinder 1 is released.

[0037] Further, see Figure 1 As shown, in some embodiments, the diameter of each drainage hole 21 is set to 11-12 cm. In this embodiment, the diameter of each drainage hole 21 can be set to 11-12 cm, so that each drainage hole 21 can drain the water seeping from the internal cavity of the cylinder 1 and the excess mud generated during the circulation drilling process, while ensuring that the gravel entering the cylinder 1 is not easy to escape. Preferably, the diameter of each drainage hole 21 can be set to 10 cm.

[0038] Further, see Figure 1 and Figure 2 As shown, in some embodiments, a plurality of fixing plates 6 are provided between the connecting steel pipe 3 and the top plate 2. In this embodiment, the plurality of fixing plates 6 can effectively support the connecting steel pipe 3 to prevent the connecting steel pipe 3 from affecting the drilling efficiency due to tilting during the cyclic drilling process.

[0039] Further, see Figure 1 and Figure 2As shown, in some embodiments, a plurality of the fixing plates 6 are arranged at equal intervals along the axis of the connecting steel pipe 3, and a plurality of the fixing plates 6 are arranged perpendicularly to the top plate 2. In this embodiment, a plurality of the fixing plates 6 can be arranged at equal intervals along the axis of the connecting steel pipe 3, and a plurality of the fixing plates 6 can be arranged perpendicularly to the top plate 2, so that the connecting steel pipe 3 is kept upright during the cyclic drilling process, and the drilling rig connection bayonet 4 located on the connecting steel pipe 3 is kept upright, so that the drilling rig installed on the drilling rig connection bayonet 4 is kept upright, and the drilling rig efficiency is prevented from being affected by tilting during the cyclic drilling process.

[0040] Further, see Figure 1 and Figure 2 As shown, in some embodiments, the gravel salvage device also includes a plurality of drilling rig connection sockets 4, the inner diameter of each of the drilling rig connection sockets 4 is equal to the outer diameter of the connecting steel pipe 3, the outer diameters of the plurality of drilling rig connection sockets 4 are different, and the plurality of drilling rig connection sockets 4 are selectively installed on the connecting steel pipe 3.

[0041] In this embodiment, the inner diameter of each drilling rig connecting socket 4 is equal to the outer diameter of the connecting steel pipe 3, so that each drilling rig connecting socket 4 can be installed on the connecting steel pipe 3 without being easily removed. Multiple drilling rig connecting sockets 4 with different outer diameters are selectively installed on the connecting steel pipe 3, so that the gravel salvage device can match drilling rigs of different models, thereby improving the adaptability of the gravel salvage device.

[0042] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0043] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0044] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A gravel salvage device, characterized in that: It includes: A cylinder (1), a top plate (2) being installed at one end of the cylinder (1), a connecting steel pipe (3) being installed at one side of the top plate (2), and the cylinder (1) and the connecting steel pipe (3) being coaxially arranged; A drilling rig connection bayonet (4), wherein the drilling rig connection bayonet (4) is sleeved on one end of the connecting steel pipe (3); A crushed stone anti-slip device (5) comprises a plurality of elastic steel wire ropes (51) and an anti-slip hoop (52), wherein the anti-slip hoop (52) is sleeved and welded to the other end of the cylinder (1), a plurality of mounting holes (521) are arranged on one side of the anti-slip hoop (52), a plurality of the elastic steel wire ropes (51) are mounted in the plurality of mounting holes (521), the plurality of the elastic steel wire ropes (51) are evenly arranged along the circumferential direction of the anti-slip hoop (52), one end of the plurality of the elastic steel wire ropes (51) is fixed to the anti-slip hoop (52), and the other ends of the plurality of the elastic steel wire ropes (51) converge at the center of the anti-slip hoop (52).

2. The gravel salvaging device according to claim 1, characterized in that: The elastic steel wire rope (51) is made of threaded steel, and the rigidity of the threaded steel is set to 1500-2000 MPa.

3. The gravel salvaging device according to claim 1, characterized in that: The diameter of each elastic steel wire rope (51) is set to 3-4 cm.

4. The gravel salvaging device according to claim 1, characterized in that: The top plate (2) is provided with a plurality of drainage holes (21), and the plurality of drainage holes (21) are connected to the internal cavity of the cylinder (1).

5. The gravel salvaging device according to claim 4, characterized in that: The diameter of each drainage hole (21) is set to 11-12 cm.

6. The gravel salvaging device according to claim 1, characterized in that: A plurality of fixing plates (6) are arranged between the connecting steel pipe (3) and the top plate (2).

7. The gravel salvaging device according to claim 6, characterized in that: The plurality of fixing plates (6) are arranged at equal intervals along the axis of the connecting steel pipe (3), and the plurality of fixing plates (6) are arranged perpendicular to the top plate (2).

8. The gravel salvaging device according to claim 1, characterized in that: The gravel salvaging device further comprises a plurality of drilling rig connection sockets (4), the inner diameter of each of the drilling rig connection sockets (4) being equal to the outer diameter of the connecting steel pipe (3), the outer diameters of the plurality of drilling rig connection sockets (4) being different, and the plurality of drilling rig connection sockets (4) being selectively installed on the connecting steel pipe (3).