Keel leveling screw, keel leveling waterproof hollow screw rod and assembly comprising keel leveling screw and keel leveling waterproof hollow screw rod

Abstract

The utility model discloses a keel leveling screw, a keel leveling waterproof hollow screw rod and an assembly comprising the keel leveling waterproof hollow screw rod. The keel leveling screw comprises a screw thread tip part and a screw nut which are connected with each other. The end, away from the screw thread tip part, of the screw nut is provided with a screw thread opening. A fixed isolation piece is arranged at the joint of the screw thread tip part and the screw nut. The fixed spacer is of an annular sheet structure, and the outer diameter of the fixed spacer is larger than the maximum outer diameter of a screw cap and a screw thread tip part; and the screw thread tip part, the screw cap and the fixed spacer are integrally formed. The assembly comprises a keel leveling screw and an expansion pipe. According to the keel leveling screw, the fixed isolation piece additionally arranged between the screw thread tip part and the screw cap can provide support for the keel, the whole screw is manufactured by adopting an integral forming process, the cost is low, the fixed isolation piece can be prevented from shifting under the gravity action of the keel so as to level the keel and a plate, the operation is simple and convenient, and the construction efficiency is high; and the applicability is improved by adding the expansion pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture and building materials accessories, and relates to a keel leveling screw, a waterproof hollow keel leveling screw and a component including the same, in particular to a keel leveling screw, a waterproof hollow keel leveling screw, a keel leveling expansion screw and a waterproof hollow keel leveling expansion screw. Background Art

[0002] At present, with the improvement of living standards, people pay more and more attention to indoor decoration. The main purpose of floor and wall decoration is to protect the floor / wall and beautify the floor / wall environment. The most common floor / wall decoration on the market at present is decorative panel finishing. The forms of decorative panels mainly include ceramic tiles and functional panels. The traditional construction process of ceramic tiles at present is to bond them to the floor / wall through cement. To ensure the overall flatness of the ceramic tiles, it is often necessary to accurately align the ceramic tiles, which is not only time-consuming and laborious, but also the construction quality is greatly affected by the construction level of the construction personnel. The construction of functional panels is mainly to erect keels on the floor / wall and then fix the functional panels on the floor / wall by using hangers fixed on the functional panels. However, the erection of keels requires high precision. Generally, it is relatively simple to determine the horizontal position of the keels. However, since the floor / wall, that is, the installation surface, is often uneven, it is relatively complex to determine the flatness of the keels relative to the floor / wall (installation surface), and there are many inconveniences in operation.

[0003] CN219386889U discloses a keel leveling bracket, CN211949368U discloses a portable wall keel leveling and fixing member, and CN113802797B discloses a leveling mechanism for installing wall decorative panels, a keel leveling component and an assembled wall system. Although the above prior arts provide keel leveling components and can achieve keel leveling to a certain extent, their structures are complex, the costs are high and the operations are inconvenient, which greatly affects the on-site construction efficiency and the overall cost.

[0004] Therefore, it is of great practical significance to develop a keel leveling part with simple operation, low cost and high construction efficiency. Summary of the Utility Model

[0005] Due to the above-mentioned defects in the prior art, the utility model provides a keel leveling part with simple operation, low cost and high construction efficiency, specifically a keel leveling screw, a keel leveling screw rod and a component including the same, so as to solve the problems that the existing keel leveling parts have complex structures, high costs and many inconveniences in operation, which in turn affect the on-site construction efficiency and the overall cost.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A keel leveling screw, comprising a screw thread tip part I and a screw nut I which are connected to each other;

[0008] A screw thread opening I is provided at the end of the screw nut I away from the screw thread tip part I, and a fixed spacer I is provided at the connection between the screw thread tip part I and the screw nut I;

[0009] The fixed spacer I is of an annular sheet structure, the outer diameter of the fixed spacer I is greater than the maximum outer diameter of the screw nut I, and the outer diameter of the fixed spacer I is greater than the maximum outer diameter of the screw thread tip part I;

[0010] The screw thread tip part I, the screw nut I and the fixed spacer I are integrally formed.

[0011] The application method is as follows: After fixing the keel leveling screw to the fixed position, place the keel on the keel leveling screw, so that the screw nut I of the keel leveling screw passes through the keel fixing hole and the size of the fixed spacer I is greater than the keel fixing hole, that is, at this time the fixed spacer I is in contact with the keel. By rotating the keel leveling screw, the height adjustment of the keel at this position can be completed. The operation is simple and can greatly improve the construction efficiency.

[0012] The keel leveling screw of the present utility model, the fixed spacer I added between the screw thread tip part I and the screw nut I can provide support for the keel. The whole screw is made by an integral forming process, with low cost and can avoid the fixed spacer I from shifting under the gravity of the keel to achieve the leveling effect of the keel and the plate parts. Its operation is simple, the construction efficiency is high, and it has great application prospects.

[0013] The present utility model provides a keel leveling expansion screw, comprising the keel leveling screw as described above and an expansion tube;

[0014] An internal thread structure I matching the external thread structure I of the screw thread tip part I is provided on the expansion tube. After burying the expansion tube at the pre-buried place, screwing the keel leveling screw into the expansion tube can complete the fixation of the keel leveling screw, improving the applicability of the keel leveling screw and enabling it to be applied to working environments such as concrete.

[0015] The present utility model also provides a keel leveling screw, comprising a screw thread tip part II and an upper screw rod II which are connected to each other;

[0016] The screw thread tip part II and the upper screw rod II are coaxial, and a fixed spacer II is provided at the connection between the screw thread tip part II and the upper screw rod II. A screw thread opening II is provided at the end of the upper screw rod II away from the screw thread tip part II;

[0017] The fixed spacer II is in a ring-shaped sheet structure. The outer diameter of the fixed spacer II is larger than the outer diameter of the upper screw II, and the outer diameter of the fixed spacer II is larger than the maximum outer diameter of the screw thread tip II.

[0018] The screw thread tip II, the upper screw II, and the fixed spacer II are integrally formed.

[0019] The application method is as follows: After fixing the keel leveling screw to the fixed position, place the keel on the keel leveling screw, so that the upper screw II of the keel leveling screw passes through the keel fixing hole and the size of the fixed spacer II is larger than the keel fixing hole, that is, at this time the fixed spacer II contacts the keel. By rotating the keel leveling screw, the height adjustment of the keel at this position can be completed. The operation is simple and can greatly improve the construction efficiency.

[0020] As a preferred technical solution:

[0021] For a keel leveling screw as described above, the maximum outer diameter of the screw thread tip II is larger than the outer diameter of the upper screw II.

[0022] For a keel leveling screw as described above, it further includes a keel fixing nut matching with the upper screw II. An internal thread structure II matching the external thread structure II of the upper screw II is provided on the keel fixing nut. The keel can be fixed to the keel leveling screw by using the keel fixing nut, avoiding the shaking of the keel position.

[0023] The present utility model also provides a keel leveling expansion screw, including the keel leveling screw as described above and an expansion tube;

[0024] An internal thread structure III matching the external thread structure III of the screw thread tip II is provided on the expansion tube. The addition of the expansion tube improves the applicability of the keel leveling screw, enabling it to be applied to working environments such as concrete.

[0025] In addition, the present utility model also provides a keel leveling waterproof hollow screw, including a hollow lower screw III and a hollow upper screw III connected to each other;

[0026] The hollow lower screw III and the hollow upper screw III are coaxial and the outer diameter of the hollow lower screw III is larger than that of the hollow upper screw III. A fixed spacer III is provided at the connection of the hollow lower screw III and the hollow upper screw III. A screw thread III is provided at the end of the hollow upper screw III away from the hollow lower screw III;

[0027] The fixed spacer III is a ring-shaped sheet structure. The outer diameter of the fixed spacer III is larger than the outer diameter of the hollow upper screw III, and the outer diameter of the fixed spacer III is larger than the outer diameter of the hollow lower screw III.

[0028] The hollow lower screw III, the hollow upper screw III and the fixed spacer III are integrally formed.

[0029] The keel leveling waterproof hollow screw is applicable to the situation where a fixed nut is provided at the installation location. Of course, those skilled in the art can select a suitable product according to actual needs to meet the usage requirements. Of course, it can also be a non-hollow structure. The hollow structure is mainly to facilitate filling with waterproof agent to improve the waterproof performance.

[0030] As a preferred technical solution:

[0031] A keel leveling waterproof hollow screw as described above further includes a keel fixing nut that matches the hollow upper screw III. The keel fixing nut is provided with an internal thread structure IV that matches the external thread structure IV of the hollow upper screw III.

[0032] The hollow parts of the hollow lower screw III and the hollow upper screw III are communicated. The keel can be fixed to the keel leveling waterproof hollow screw by using the keel fixing nut, avoiding the position of the keel from shaking.

[0033] In addition, the present invention also provides a keel leveling waterproof hollow expansion screw, which includes the keel leveling waterproof hollow screw as described above and an expansion tube.

[0034] The expansion tube is provided with an internal thread structure V that matches the external thread structure V of the lower screw III. The addition of the expansion tube improves the applicability of the keel leveling waterproof hollow screw, enabling it to be applied to working environments such as concrete.

[0035] The above technical solutions are only a feasible technical solution of the present invention. The protection scope of the present invention is not limited thereto. Those skilled in the art can reasonably adjust the specific design according to actual needs.

[0036] The above-mentioned utility model has the following advantages or beneficial effects:

[0037] (1) For the keel leveling screw of the present invention, the fixed spacer added between the screw thread tip and the screw nut can provide support for the keel. The screw is integrally formed by an integral molding process, with low cost and can prevent the fixed spacer from shifting under the gravity of the keel to achieve the leveling of the keel and the plate members. Its operation is simple and the construction efficiency is high.

[0038] (2) The leveling expansion screw of the present utility model is added with an expansion tube, which greatly improves the applicability of the leveling screw of the keel, enabling it to be applied to working environments such as concrete;

[0039] (3) The present utility model provides a variety of keel leveling parts (screw rod / screw / expansion screw rod / expansion screw), with good applicability and capable of meeting the usage needs of different application scenarios. The waterproof hollow screw rod for keel leveling is particularly suitable for wall and floor surfaces with water stains, humidity, and easy penetration, and has great application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, the present utility model and its features, appearance, and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, and the focus is on showing the gist of the present utility model.

[0041] Figure 1 It is a schematic structural diagram of the leveling screw of the keel for Embodiment 1;

[0042] Figure 2 It is a top view of the nut of the leveling screw of the keel for Embodiment 1;

[0043] Figure 3 It is a top view of the fixed spacer I;

[0044] Figure 4 It is an application schematic diagram of the leveling screw of the keel for Embodiment 1;

[0045] Figure 5 It is a schematic structural diagram of the leveling screw of the keel for Embodiment 3;

[0046] Figure 6 It is a top view of the top of the leveling screw of the keel for Embodiment 3;

[0047] Figure 7 It is a top view of the fixed spacer II;

[0048] Figure 8 It is an application schematic diagram of the leveling screw of the keel for Embodiment 3;

[0049] Figure 9 and 10 are respectively the top view and the front view of the keel fixing nut;

[0050] Figure 11 It is an application schematic diagram of the leveling expansion screw of the keel for Embodiment 4;

[0051] Figure 12 It is a schematic structural diagram of the waterproof hollow screw rod for keel leveling of Embodiment 5;

[0052] Figure 13Top view of the top of the keel leveling waterproof hollow screw of Example 5;

[0053] Figure 14 Top view of the fixed spacer III;

[0054] Figure 15 Application schematic diagram of the keel leveling waterproof hollow screw of Example 5;

[0055] Figure 16 Application schematic diagram of the keel leveling waterproof hollow expansion screw of Example 6;

[0056] Among them, 1 is the keel leveling screw I, 11 is the screw thread tip I, 12 is the fixed spacer I, 13 is the screw nut I, 14 is the screw thread I, 2 is the keel, 3 is the keel leveling screw II, 31 is the screw thread tip II, 32 is the fixed spacer II, 33 is the upper screw II, 34 is the screw thread II, 4 is the keel fixing nut, 5 is the expansion tube, 6 is the keel leveling waterproof hollow screw, 61 is the hollow lower screw III, 62 is the fixed spacer III, 63 is the hollow upper screw III, 64 is the screw thread III. Detailed implementation method

[0057] The following combines the drawings and specific embodiments to further illustrate the structure in the present invention, but it is not a limitation of the present invention.

[0058] Example 1

[0059] A keel leveling screw, namely the keel leveling screw I1, as Figures 1 to 3 shown, includes a screw thread tip I11 and a screw nut I13 that are connected to each other;

[0060] A screw thread I14 is opened at the end of the screw nut I13 away from the screw thread tip I11, and a fixed spacer I12 is provided at the connection between the screw thread tip I11 and the screw nut I13;

[0061] The fixed spacer I12 is a ring-shaped sheet structure. The outer diameter of the fixed spacer I12 is greater than the maximum outer diameter of the screw nut I13, and the outer diameter of the fixed spacer I12 is greater than the maximum outer diameter of the screw thread tip I11;

[0062] The screw thread tip I11, the screw nut I13, and the fixed spacer I12 are integrally formed.

[0063] Its application is as Figure 4As shown: After fixing the keel leveling screw I1 to the fixed position, place the keel 2 on the keel leveling screw I1, so that the screw nut I13 of the keel leveling screw I1 passes through the keel fixing hole and the size of the fixing spacer I12 is larger than the keel fixing hole, that is, at this time the fixing spacer I12 contacts the keel 2. By rotating the keel leveling screw I1, the height adjustment of the keel 2 at this position can be completed. The operation is simple and can greatly improve the construction efficiency.

[0064] Embodiment 2

[0065] A keel leveling expansion screw, including the same keel leveling screw I as in Embodiment 1 and an expansion tube;

[0066] The expansion tube is provided with an internal thread structure I that matches the external thread structure I of the screw thread tip part I.

[0067] Its application is as follows: After burying the expansion tube at the specified position, screw the keel leveling screw I into the expansion tube, place the keel on the keel leveling screw I, so that the screw nut I of the keel leveling screw I passes through the keel fixing hole and the size of the fixing spacer I is larger than the keel fixing hole, that is, at this time the fixing spacer I contacts the keel. By rotating the keel leveling screw I, the height adjustment of the keel at this position can be completed. The operation is simple and can greatly improve the construction efficiency.

[0068] Embodiment 3

[0069] A keel leveling screw, that is, the keel leveling screw II 3, as Figures 5 to 7 shown, includes a screw thread tip part II 31 and an upper screw rod II 33 that are connected to each other. The maximum outer diameter of the screw thread tip part II 31 is larger than the outer diameter of the upper screw rod II 33;

[0070] The screw thread tip part II 31 and the upper screw rod II 33 are coaxial, and a fixing spacer II 32 is provided at the connection between the screw thread tip part II 31 and the upper screw rod II 33. A screw thread II 34 is opened at the end of the upper screw rod II 33 away from the screw thread tip part II 31;

[0071] The fixing spacer II 32 is an annular sheet structure. The outer diameter of the fixing spacer II 32 is larger than the outer diameter of the upper screw rod II 33, and the outer diameter of the fixing spacer II 32 is larger than the maximum outer diameter of the screw thread tip part II 31;

[0072] The screw thread tip part II 31, the upper screw rod II 33 and the fixing spacer II 32 are integrally formed;

[0073] It further includes a keel fixing nut 4 that matches the upper screw rod II 33 (as Figure 9 and 10As shown, an internal thread structure II that matches the external thread structure II of the upper screw II 33 is provided on the keel fixing nut 4.

[0074] Its application is as Figure 8 shown: After fixing the keel leveling screw II 3 to the fixed position, place the keel 2 on the keel leveling screw II 3, which enables the upper screw II 33 of the keel leveling screw II 3 to pass through the keel fixing hole and the size of the fixing spacer II 32 is larger than the keel fixing hole, that is, at this time the fixing spacer II 32 contacts the keel 2. By rotating the keel leveling screw II 3, the height adjustment of the keel 2 at this position can be completed, and then the keel fixing nut 4 is screwed onto the upper screw II 33 to lock the keel 2.

[0075] Example 4

[0076] A keel leveling expansion screw includes the same keel leveling screw II 3 as in Example 3 and an expansion tube 5;

[0077] An internal thread structure III that matches the external thread structure III of the screw thread tip part II is provided on the expansion tube 5.

[0078] Its application is as Figure 11 shown: After burying the expansion tube 5 at the specified position, screw the keel leveling screw II 3 into the expansion tube 5, place the keel 2 on the keel leveling screw II 3, which enables the upper screw II 33 of the keel leveling screw II 3 to pass through the keel fixing hole and the size of the fixing spacer II 32 is larger than the keel fixing hole, that is, at this time the fixing spacer II 32 contacts the keel 2. By rotating the keel leveling screw II 3, the height adjustment of the keel at this position can be completed, and then the keel fixing nut 4 is screwed onto the upper screw II 33 to lock the keel 2.

[0079] Example 5

[0080] A keel leveling waterproof hollow screw 6, as Figures 12 to 14 shown, includes a hollow lower screw III 61 and a hollow upper screw III 63 that are connected to each other, and the hollow parts of the hollow lower screw III 61 and the hollow upper screw III 63 are communicated;

[0081] The hollow lower screw III 61 and the hollow upper screw III 63 are coaxial and the outer diameter of the hollow lower screw III 61 is larger than that of the hollow upper screw III 63. A fixing spacer III 62 is provided at the connection of the hollow lower screw III 61 and the hollow upper screw III 63. A screw thread opening III 64 is provided at the end of the hollow upper screw III 63 away from the hollow lower screw III 61. The screw thread opening III 64 is a hollow structure and it is also the inlet for injecting waterproofing agent;

[0082] The fixed spacer III 62 is in an annular sheet structure. The outer diameter of the fixed spacer III 62 is larger than the outer diameter of the hollow upper screw III 63, and the outer diameter of the fixed spacer III 62 is larger than the outer diameter of the hollow lower screw III 61.

[0083] The hollow lower screw III 61, the hollow upper screw III 63 and the fixed spacer III 62 are integrally formed.

[0084] It further includes a keel fixing nut 4 (as shown in Figure 9 and 10 ) that matches the hollow upper screw III 63. The keel fixing nut 4 is provided with an internal thread structure IV that matches the external thread structure IV of the hollow upper screw III 63.

[0085] Its application is as shown in Figure 15 : After fixing the keel leveling and waterproof hollow screw 6 to the fixed position, place the keel 2 on the keel leveling and waterproof hollow screw 6, so that the hollow upper screw III 63 of the keel leveling and waterproof hollow screw 6 passes through the keel fixing hole and the size of the fixed spacer III 62 is larger than the keel fixing hole, that is, at this time, the fixed spacer III 62 contacts the keel 2. By rotating the keel leveling and waterproof hollow screw 6, the height adjustment of the keel 2 at this position can be completed. Then, screw the keel fixing nut 4 onto the hollow upper screw III 63 to lock the keel 2. Then, inject the waterproof agent from the hollow screw III 64, and let the waterproof agent penetrate into the wall from the hollow screw. The waterproof agent can block the moisture and water stains penetrating from the outside of the screw, so as to achieve the waterproof function. This keel leveling and waterproof hollow screw is commonly used for wall and floor with relatively high humidity or water stain penetration, and thus can achieve very good waterproof effect.

[0086] Embodiment 6

[0087] A keel leveling and waterproof hollow expansion screw, including the same keel leveling and waterproof hollow screw 6 and expansion tube 5 as in Embodiment 3.

[0088] The expansion tube 5 is provided with an internal thread structure V that matches the external thread structure V of the hollow lower screw III 61.

[0089] Its application is as shown in Figure 16As shown in the figure: After embedding the expansion tube 5 into the specified position, screw the leveling and waterproof hollow screw 6 for the keel into the expansion tube 5, place the keel 2 on the leveling and waterproof hollow screw 6 for the keel, so that the hollow upper screw III 63 of the leveling and waterproof hollow screw 6 for the keel passes through the keel fixing hole and the size of the fixed spacer III 62 is larger than the keel fixing hole, that is, at this time the fixed spacer III 62 contacts the keel 2. By rotating the leveling and waterproof hollow screw 6 for the keel, the height adjustment of the keel 2 at this position can be completed. Then screw the keel fixing nut 4 onto the hollow upper screw III 63 to lock the keel 2. Then inject the waterproof agent from the hollow screw III 64, and let the waterproof agent penetrate into the wall from the hollow screw. The waterproof agent can block the moisture and water stains penetrating from the outside of the screw, so as to achieve the waterproof function. This leveling and waterproof hollow expansion screw for the keel is commonly used for wall and floor with relatively high humidity or water stain penetration, and thus can achieve very good waterproof effect.

[0090] It has been verified that the leveling screw for the keel of the present utility model can provide support for the keel by the fixed spacer added between the tip of the screw thread and the screw nut of the screw. The whole screw is made by an integral molding process, with low cost and can avoid the offset of the fixed spacer under the gravity of the keel to achieve the leveling of the keel and the plate. Its operation is simple and the construction efficiency is high; the leveling and expansion screw for the keel, with the addition of the expansion tube, greatly improves the applicability of the leveling screw for the keel, making it applicable to working environments such as concrete and various masonry brick walls; the present utility model provides a variety of leveling parts for the keel (screw / bolt / expansion screw / expansion bolt), with good applicability and can meet the usage needs of different application scenarios. The leveling and waterproof hollow screw for the keel is especially suitable for wall and floor with water stains, humidity and easy penetration, and has great application prospects.

[0091] Those skilled in the art should understand that those skilled in the art can realize the variation examples in combination with the prior art and the above embodiments, which will not be elaborated here. Such variation examples do not affect the essential content of the present utility model and will not be elaborated here.

[0092] The preferred embodiments of the present utility model have been described above. It should be understood that the present utility model is not limited to the above specific implementation manners. The equipment and structures not described in detail should be understood to be implemented in the ordinary manner in the art; any person skilled in the art, without departing from the scope of the technical solution of the present utility model, can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essential content of the present utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of the protection of the technical solution of the present utility model.

Claims

1. A keel leveling screw, characterized in that, It includes a screw thread tip part I and a screw nut I which are connected to each other; At the end of the screw nut I away from the screw thread tip part I, there is a screw thread I, and a fixed separator I is provided at the connection between the screw thread tip part I and the screw nut I; The fixed separator I is in a ring-shaped sheet structure. The outer diameter of the fixed separator I is greater than the maximum outer diameter of the screw nut I, and the outer diameter of the fixed separator I is greater than the maximum outer diameter of the screw thread tip part I; The screw thread tip part I, the screw nut I and the fixed separator I are integrally formed.

2. A keel leveling expansion screw, characterized in that, It includes the keel leveling screw as described in claim 1 and an expansion tube; On the expansion tube, there is an internal thread structure I that matches the external thread structure I of the screw thread tip part I.

3. A keel leveling screw, characterized in that, It includes a screw thread tip part II and an upper screw rod II which are connected to each other; The screw thread tip part II and the upper screw rod II are coaxial, and a fixed separator II is provided at the connection between the screw thread tip part II and the upper screw rod II. At the end of the upper screw rod II away from the screw thread tip part II, there is a screw thread II; The fixed separator II is in a ring-shaped sheet structure. The outer diameter of the fixed separator II is greater than the outer diameter of the upper screw rod II, and the outer diameter of the fixed separator II is greater than the maximum outer diameter of the screw thread tip part II; The screw thread tip part II, the upper screw rod II and the fixed separator II are integrally formed.

4. A leveling screw for keel according to claim 3, characterized in that, The maximum outer diameter of the screw thread tip part II is greater than the outer diameter of the upper screw rod II.

5. A leveling screw for keel according to claim 3, characterized in that, It further includes a keel fixing nut that matches the upper screw rod II. On the keel fixing nut, there is an internal thread structure II that matches the external thread structure II of the upper screw rod II.

6. A keel leveling expansion screw, characterized in that, It includes the keel leveling screw and the expansion tube as described in any one of claims 3 to 5; On the expansion tube, there is an internal thread structure III that matches the external thread structure III of the screw thread tip part II.

7. A keel leveling and waterproof hollow screw, characterized in that, It includes a hollow lower screw rod III and a hollow upper screw rod III which are connected to each other; The hollow lower screw rod III and the hollow upper screw rod III are coaxial, the outer diameter of the hollow lower screw rod III is greater than that of the hollow upper screw rod III, and a fixed separator III is provided at the connection between the hollow lower screw rod III and the hollow upper screw rod III. At the end of the hollow upper screw rod III away from the hollow lower screw rod III, there is a screw thread III; The fixed separator III is in a ring-shaped sheet structure. The outer diameter of the fixed separator III is greater than the outer diameter of the hollow upper screw rod III, and the outer diameter of the fixed separator III is greater than the outer diameter of the hollow lower screw rod III; The hollow lower screw rod III, the hollow upper screw rod III and the fixed separator III are integrally formed.

8. A leveling and waterproof hollow screw for keel according to claim 7, characterized in that, It further includes a keel fixing nut that matches the hollow upper screw rod III. On the keel fixing nut, there is an internal thread structure IV that matches the external thread structure IV of the hollow upper screw rod III; The hollow parts of the hollow lower screw rod III and the hollow upper screw rod III are communicated.

9. A keel leveling waterproof hollow expansion screw, characterized in that, It includes the keel leveling waterproof hollow screw and the expansion tube as described in any one of claims 7 to 8; On the expansion tube, there is an internal thread structure V that matches the external thread structure V of the hollow lower screw rod III.

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