Nut with butterfly-shaped head easy to be screwed manually

Abstract

The invention relates to the technical field of nuts, and discloses a nut with a butterfly-shaped head easy to screw manually, which solves the problem that the existing nut is inconvenient to screw manually, and comprises a nut body consisting of a hexagonal nut head, a conical nut head, a first butterfly-shaped side wing and a second butterfly-shaped side wing, the conical nut head is fixedly connected to one end of the hexagonal nut head, the first butterfly-shaped side wing and the second butterfly-shaped side wing are fixedly connected to the two sides of the end, away from the hexagonal nut head, of the conical nut head correspondingly, the first butterfly-shaped side wing and the second butterfly-shaped side wing are of a symmetrical structure, and threaded grooves are formed in the hexagonal nut head and the conical nut head correspondingly. Each of the first butterfly-shaped side wing and the second butterfly-shaped side wing is composed of a butterfly-shaped side wing plate body, a rotating force arm and an inserting vertical arm; by means of the nut, screwing can be conveniently conducted in a manual mode.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuts, and specifically relates to a nut with a butterfly head that is easy to manually tighten. Background Art

[0002] Butterfly nuts are often used for fastening in the connection and fixation of mechanical components. The connection of two or more components is achieved through the cooperation of a butterfly nut and a bolt. The butterfly nut facilitates manual tightening by the staff. However, when the existing butterfly nut is tightened manually to a certain extent, it cannot be tightened further, and at this time, the butterfly nut is not really tightened. Usually, a professional supporting auxiliary tool is used to tighten it. Therefore, how to manually tighten the butterfly nut is an urgent problem to be solved. For this reason, this application proposes a nut with a butterfly head that is easy to manually tighten. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a nut with a butterfly head that is easy to manually tighten, effectively solving the problem that the existing nuts are not convenient for manual tightening.

[0004] To achieve the above object, the present invention provides the following technical solution: A nut with a butterfly head that is easy to manually tighten, including a nut body. The nut body is composed of a hexagonal nut head, a conical nut head, a first butterfly wing and a second butterfly wing. The conical nut head is fixedly connected to one end of the hexagonal nut head. The first butterfly wing and the second butterfly wing are respectively fixedly connected to both sides of the conical nut head away from the hexagonal nut head. The first butterfly wing and the second butterfly wing are symmetrical structures. Thread grooves are provided inside both the hexagonal nut head and the conical nut head. Both the first butterfly wing and the second butterfly wing are composed of a butterfly wing plate body, a rotating force arm and a plugging vertical arm. The butterfly wing plate body is fixedly connected to the conical nut head. The rotating force arm is rotatably connected to the inside of the butterfly wing plate body through a first hinge shaft. The plugging vertical arm is plugged into the inside of the butterfly wing plate body. A plugging groove matching the plugging vertical arm is provided at one end of the rotating force arm away from the first hinge shaft. A plugging head matching the plugging groove is fixedly provided at one end of the plugging vertical arm. A rotating force arm installation groove matching the rotating force arm is provided on one side of the butterfly wing plate body. A plugging vertical arm installation groove matching the plugging vertical arm is provided on the side of the butterfly wing plate body away from the rotating force arm installation groove. A through inner groove communicating with the rotating force arm installation groove and the plugging vertical arm installation groove is provided at the middle position inside the butterfly wing plate body.

[0005] Preferably, a buckle is fixedly arranged at one end of the side of the rotary force arm close to the insertion slot, a semi-circular limiting plate matching the through inner slot is fixedly arranged on the side of the rotary force arm away from the buckle, and a semi-circular limiting groove matching the semi-circular limiting plate is arranged on one side of the insertion vertical arm.

[0006] Preferably, strip-shaped limiting ribs I are fixedly arranged at one ends of the two sides of the rotary force arm adjacent to the semi-circular limiting plate and close to the hinge shaft I, and strip-shaped limiting ribs II matching the strip-shaped limiting ribs I are fixedly arranged at one ends of the two sides inside the installation slot of the rotary force arm and close to the hinge shaft I.

[0007] Preferably, a threaded hole I is arranged at one end of the butterfly-shaped side wing plate body close to the conical nut head, a locking bolt matching the threaded hole I is arranged at one end of the side of the butterfly-shaped side wing plate body close to the conical nut head, a threaded hole II communicating with the insertion slot and matching the locking bolt is arranged at one end of the rotary force arm close to the insertion slot, and a threaded hole III matching the locking bolt is arranged on the plug head.

[0008] Preferably, an arc-shaped groove is arranged at one end of the butterfly-shaped side wing plate body away from the conical nut head, an arc-shaped PVC seal strip is arranged inside the arc-shaped groove, and the arc-shaped PVC seal strip is rotationally connected inside the arc-shaped groove through a hinge shaft II.

[0009] Preferably, a plurality of arc-shaped limiting ribs I are fixedly arranged on both sides inside the arc-shaped groove, and a plurality of arc-shaped limiting ribs II matching the arc-shaped limiting ribs I are fixedly arranged on both sides of the arc-shaped PVC seal strip.

[0010] Preferably, an installation inner slot is arranged at one end of the insertion vertical arm away from the plug head, a pulling limiting component is arranged inside the installation inner slot, and the pulling limiting component is connected with the arc-shaped PVC seal strip through a pulling rope.

[0011] Preferably, an inner buckling groove is arranged at one end of the outer side wall of the arc-shaped PVC seal strip.

[0012] Preferably, the pulling limiting component is composed of a central connecting column, a rope pulley and a winding spring. The central connecting column is fixedly connected to the central position inside the installation inner slot, the rope pulley is sleeved on the central connecting column, the winding spring is connected between the central connecting column and the rope pulley, and one end of the pulling rope is connected with the rope pulley.

[0013] Preferably, two limiting pressure wheels and two limiting guide sleeves are arranged on the side inside the installation inner slot, and the pulling rope is located between the two limiting pressure wheels and penetrates through the inside of the two limiting guide sleeves.

[0014] Compared with the prior art, the beneficial effects of the present invention are: (1) During work, by setting a nut body composed of a hexagonal nut head, a conical nut head, a first butterfly wing, and a second butterfly wing, a butterfly structure can be formed, which facilitates quick rotation manually, enabling the hexagonal nut head and the conical nut head to be connected to the bolt column, improving the convenience of operation. At the same time, a wrench can also be used to tighten the hexagonal nut head to enhance the tightness of the connection. (2) By setting the first butterfly wing and the second butterfly wing composed of a butterfly wing plate body, a rotating force arm, and a plugging vertical arm, without tools such as a wrench, by assembling the rotating force arm and the plugging vertical arm, two extended vertical arms can be formed. The extended vertical arms facilitate the staff to hold tightly with both hands, enabling the nut to be tightened without tools. By setting a plugging slot and a plugging joint, the stability of the connection between the rotating force arm and the plugging vertical arm can be improved, increasing the force-bearing capacity. (3) By setting a buckle, it is convenient to pull out the rotating force arm from the inside of the rotating force arm installation slot. By setting a semi-circular limiting plate and a semi-circular limiting groove, the rotating force arm and the plugging vertical arm can be locked and limited to prevent the plugging vertical arm from falling or shaking inside the butterfly wing plate body. By setting a first threaded hole, a locking bolt, a second threaded hole, and a third threaded hole, the locking and limiting function can be achieved in the state where the first butterfly wing and the second butterfly wing are closed or unfolded. (4) By setting an arc-shaped PVC seal, the arc-shaped groove can be closed to prevent the plugging vertical arm from falling. By setting a pulling rope and a pulling and limiting assembly composed of a central connecting column, a rope pulley, and a winding spring, further limiting of the plugging vertical arm can be achieved to prevent the plugging vertical arm from being lost. Also, when the plugging vertical arm is in the unfolded state, the limiting and tensioning can be realized, making the plugging vertical arm in a vertical state, facilitating the staff to perform the tightening operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0016] In the drawings: Figure 1 is a schematic structural view of the nut with a butterfly head that is easy to manually tighten according to the present invention; Figure 2 is a cross-sectional view of the nut with a butterfly head that is easy to manually tighten according to the present invention; Figure 3 is the present invention Figure 2 partial enlarged view; Figure 4 is a schematic structural view of the unfolded state of the nut body according to the present invention; Figure 5 is the present inventionFigure 4 Partial enlarged view; Figure 6 Cross-sectional view of the unfolded state of the nut body of the present invention; Figure 7 For the present invention Figure 6 Partial enlarged view; Figure 8 Cross-sectional view of the butterfly-shaped wing plate body of the present invention; Figure 9 Schematic diagram of the rotary force arm and the insertion vertical arm structure of the present invention; Figure 10 For the present invention Figure 9 Partial enlarged view; In the figure: 1, nut body; 2, hexagonal nut head; 3, conical nut head; 4, first butterfly-shaped wing; 5, second butterfly-shaped wing; 6, thread groove; 7, butterfly-shaped wing plate body; 8, rotary force arm; 9, insertion vertical arm; 10, first hinge shaft; 11, insertion slot; 12, insertion head; 13, rotary force arm mounting groove; 14, insertion vertical arm mounting groove; 15, through inner groove; 16, buckle; 17, semi-circular limiting plate; 18, semi-circular limiting groove; 19, strip-shaped limiting rib one; 20, strip-shaped limiting rib two; 21, first threaded hole; 22, locking bolt; 23, second threaded hole; 24, third threaded hole; 25, arc-shaped groove; 26, arc-shaped PVC seal; 27, second hinge shaft; 28, arc-shaped limiting rib one; 29, arc-shaped limiting rib two; 30, mounting inner groove; 31, pulling limiting assembly; 32, pulling rope; 33, inner buckle groove; 34, central connecting column; 35, rope pulley; 36, coil spring; 37, limiting pressure wheel; 38, limiting guide sleeve. Detailed implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1, given by Figures 1 to 10 A nut with a butterfly-shaped head that is easy to manually tighten according to the present invention, the nut body 1, the nut body 1 is composed of a hexagonal nut head 2, a conical nut head 3, a first butterfly-shaped wing 4 and a second butterfly-shaped wing 5. The conical nut head 3 is fixedly connected to one end of the hexagonal nut head 2. The first butterfly-shaped wing 4 and the second butterfly-shaped wing 5 are respectively fixedly connected to both sides of the end of the conical nut head 3 away from the hexagonal nut head 2. The first butterfly-shaped wing 4 and the second butterfly-shaped wing 5 are symmetric structures. Thread grooves 6 are provided inside both the hexagonal nut head 2 and the conical nut head 3; The hexagonal nut head 2 can be tightened by a wrench, and the first butterfly wing 4 and the second butterfly wing 5 can be manually tightened quickly by the staff; Both the first butterfly wing 4 and the second butterfly wing 5 are composed of a butterfly wing plate body 7, a rotating force arm 8 and a plug-in vertical arm 9. The butterfly wing plate body 7 is fixedly connected to the conical nut head 3. The rotating force arm 8 is rotatably connected to the inside of the butterfly wing plate body 7 through a hinge shaft one 10. The plug-in vertical arm 9 is inserted into the inside of the butterfly wing plate body 7. A plug-in groove 11 matching the plug-in vertical arm 9 is opened at one end of the rotating force arm 8 away from the hinge shaft one 10. A plug-in head 12 matching the plug-in groove 11 is fixedly arranged at one end of the plug-in vertical arm 9; When manually tightening, the rotating force arm 8 is moved out of the inside of the butterfly wing plate body 7 and rotated into a vertical state. Then, the plug-in vertical arm 9 is taken out of the inside of the butterfly wing plate body 7, and the plug-in head 12 is inserted into the inside of the plug-in groove 11 to form two extended vertical arms. The staff can hold the two extended vertical arms to perform the rotation tightening operation; A rotating force arm installation groove 13 matching the rotating force arm 8 is opened on one side of the butterfly wing plate body 7. A plug-in vertical arm installation groove 14 matching the plug-in vertical arm 9 is opened on the side of the inside of the butterfly wing plate body 7 away from the rotating force arm installation groove 13. A through inner groove 15 communicating with the rotating force arm installation groove 13 and the plug-in vertical arm installation groove 14 is opened at the middle position inside the butterfly wing plate body 7; The rotating force arm installation groove 13 realizes the installation of the rotating force arm 8, and the plug-in vertical arm installation groove 14 can realize the installation of the plug-in vertical arm 9; A buckle 16 is fixedly arranged at one end of the rotating force arm 8 close to the plug-in groove 11 on the side. A semi-circular limiting plate 17 matching the through inner groove 15 is fixedly arranged on the side of the rotating force arm 8 away from the buckle 16. A semi-circular limiting groove 18 matching the semi-circular limiting plate 17 is opened on one side of the plug-in vertical arm 9; The buckle 16 can facilitate the staff to pull the rotating force arm 8 out of the inside of the rotating force arm installation groove 13. When the rotating force arm 8 and the plug-in vertical arm 9 are in the storage state, the semi-circular limiting plate 17 coincides with the semi-circular limiting groove 18 to realize the limitation of the plug-in vertical arm 9 and prevent the plug-in vertical arm 9 from falling or loosening from the inside of the butterfly wing plate body 7; Strip-shaped limiting ribs one 19 are fixedly arranged at both ends of the rotating force arm 8 close to the hinge shaft one 10 on both sides of the semi-circular limiting plate 17. Strip-shaped limiting ribs two 20 matching the strip-shaped limiting ribs one 19 are fixedly arranged at both ends of the inside of the rotating force arm installation groove 13 close to the hinge shaft one 10; When the rotating force arm 8 is unfolded to form a vertical state, the strip-shaped limiting ribs one 19 and the strip-shaped limiting ribs two 20 are staggered to form a limiting effect to prevent the rotating force arm 8 from rotating by itself; One end of the butterfly-shaped side wing plate body 7 close to the conical nut head 3 is provided with a first threaded hole 21. One end of the side of the butterfly-shaped side wing plate body 7 close to the conical nut head 3 is provided with a locking bolt 22 matching the first threaded hole 21. One end of the rotating force arm 8 close to the insertion slot 11 is provided with a second threaded hole 23 communicating with the insertion slot 11 and matching the locking bolt 22. The plug joint 12 is provided with a third threaded hole 24 matching the locking bolt 22; When the rotating force arm 8 and the insertion vertical arm 9 are in the storage state, the locking bolt 22 is connected to the first threaded hole 21 and the second threaded hole 23 to limit the rotating force arm 8, indirectly limiting the insertion vertical arm 9. When the rotating force arm 8 and the insertion vertical arm 9 are in the unfolded state, the locking bolt 22 is connected to the second threaded hole 23 and the third threaded hole 24 to achieve the limiting effect, improving the connection stability between the rotating force arm 8 and the insertion vertical arm 9 and preventing the insertion vertical arm 9 from separating from the rotating force arm 8; One end of the butterfly-shaped side wing plate body 7 far from the conical nut head 3 is provided with an arc-shaped groove 25. An arc-shaped PVC seal 26 is arranged inside the arc-shaped groove 25. The arc-shaped PVC seal 26 is rotatably connected inside the arc-shaped groove 25 through a second hinge shaft 27; The arc-shaped PVC seal 26 can close the arc-shaped groove 25 and simultaneously achieve secondary limitation of the insertion vertical arm 9 to prevent the insertion vertical arm 9 from falling; A number of arc-shaped limiting ribs one 28 are fixedly arranged on both sides inside the arc-shaped groove 25. A number of arc-shaped limiting ribs two 29 matching the arc-shaped limiting ribs one 28 are fixedly arranged on both sides of the arc-shaped PVC seal 26; The arc-shaped limiting ribs one 28 and the arc-shaped limiting ribs two 29 can form a limiting effect when the arc-shaped PVC seal 26 is closed; One end of the insertion vertical arm 9 far from the plug joint 12 is provided with an installation inner groove 30. A pulling and limiting component 31 is arranged inside the installation inner groove 30. The pulling and limiting component 31 is connected to the arc-shaped PVC seal 26 through a pulling rope 32; The pulling rope 32 can further limit the insertion vertical arm 9 to prevent the insertion vertical arm 9 from being lost. The pulling and limiting component 31 can tighten the pulling rope 32. When the insertion vertical arm 9 and the rotating force arm 8 are connected and in a vertical state, it can achieve tight pulling and limiting to prevent the insertion vertical arm 9 and the rotating force arm 8 from swinging automatically, improving the convenience of operation for the staff; One end of the outer side wall of the arc-shaped PVC seal 26 is provided with an inner buckling groove 33, which is convenient for opening the arc-shaped PVC seal 26; The pulling limit component 31 is composed of a central connecting column 34, a rope pulley 35 and a coil spring 36. The central connecting column 34 is fixedly connected to the central position inside the installation inner groove 30. The rope pulley 35 is sleeved on the central connecting column 34. The coil spring 36 is connected between the central connecting column 34 and the rope pulley 35. One end of the pulling rope 32 is connected to the rope pulley 35. The central connecting column 34 and the coil spring 36 can limit the installation of the rope pulley 35, enabling the rope pulley 35 to self-reset, thereby tightening the pulling rope 32. On the side inside the installation inner groove 30, there are two limit pressure wheels 37 and two limit guide sleeves 38. The pulling rope 32 is located between the two limit pressure wheels 37 and passes through the inside of the two limit guide sleeves 38. The limit pressure wheels 37 and the limit guide sleeves 38 can limit the pulling rope 32, improving the stability when the pulling rope 32 contracts.

[0019] During operation, by setting a nut body composed of a hexagonal nut head, a conical nut head, a first butterfly wing and a second butterfly wing, the butterfly structure can facilitate quick rotation by hand, enabling the hexagonal nut head and the conical nut head to be connected to the bolt column, improving the convenience of operation. At the same time, a wrench can also be used to tighten the hexagonal nut head to enhance the tightness of the connection. By setting the first butterfly wing and the second butterfly wing composed of a butterfly wing plate body, a rotating force arm and a plug-in vertical arm, in the absence of tools such as a wrench, by assembling the rotating force arm and the plug-in vertical arm to form two extended vertical arms, it is convenient for the staff to hold tightly with both hands, thus enabling the nut to be tightened without tools. By setting a plug-in slot and a plug-in joint, the stability of the connection between the rotating force arm and the plug-in vertical arm can be improved, increasing the force-bearing capacity. By setting a buckle, it is convenient to pull out the rotating force arm from the inside of the rotating force arm installation groove. By setting a semi-circular limit plate and a semi-circular limit groove, the rotating force arm and the plug-in vertical arm can be locked and limited to prevent the plug-in vertical arm from falling or shaking inside the butterfly wing plate body. By setting a first threaded hole, a locking bolt, a second threaded hole and a third threaded hole, the locking and limiting function can be achieved in the closed or unfolded state of the first butterfly wing and the second butterfly wing. By setting an arc-shaped PVC seal, the arc-shaped groove can be closed to prevent the plug-in vertical arm from falling. By setting a pulling rope and a pulling limit component composed of a central connecting column, a rope pulley and a coil spring, further limitation of the plug-in vertical arm can be achieved to prevent the plug-in vertical arm from being lost, and also to achieve limiting and tensioning when the plug-in vertical arm is in the unfolded state, making the plug-in vertical arm in a vertical state, facilitating the tightening operation by the staff.

Claims

1. A nut having a butterfly-shaped head which is easy to tighten manually, comprising a nut body (1), characterized in that: The nut body (1) is composed of a hexagonal nut head (2), a conical nut head (3), a first butterfly wing (4) and a second butterfly wing (5); the conical nut head (3) is fixedly connected to one end of the hexagonal nut head (2); the first butterfly wing (4) and the second butterfly wing (5) are respectively fixedly connected to two sides of the conical nut head (3) away from one end of the hexagonal nut head (2); the first butterfly wing (4) and the second butterfly wing (5) are symmetrical structures; the hexagonal nut head (2) and the conical nut head (3) are both provided with a thread groove (6) inside. The first butterfly wing (4) and the second butterfly wing (5) are both composed of a butterfly wing plate body (7), a rotating force arm (8) and a plug-in vertical arm (9); the butterfly wing plate body (7) is fixedly connected to the conical nut head (3); the rotating force arm (8) is rotatably connected to the inside of the butterfly wing plate body (7) through a hinge shaft (10); the plug-in vertical arm (9) is plugged into the inside of the butterfly wing plate body (7); an end of the rotating force arm (8) away from the hinge shaft (10) is provided with a plug-in slot (11) matching the plug-in vertical arm (9); and one end of the plug-in vertical arm (9) is fixedly provided with a plug connector (12) matching the plug-in slot (11); A rotating arm mounting groove (13) matching the rotating arm (8) is provided on one side of the butterfly-shaped side wing plate (7), a plug-in vertical arm mounting groove (14) matching the plug-in vertical arm (9) is provided on a side of the butterfly-shaped side wing plate (7) away from the rotating arm mounting groove (13), and a through inner groove (15) communicating with the rotating arm mounting groove (13) and the plug-in vertical arm mounting groove (14) is provided at a middle position of the butterfly-shaped side wing plate (7).

2. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 1, characterized in that: A buckle head (16) is fixedly provided at one end of the side of the rotating force arm (8) close to the plug-in groove (11), a semicircular limiting plate (17) matching the through inner groove (15) is fixedly provided at the side of the rotating force arm (8) away from the buckle head (16), and a semicircular limiting groove (18) matching the semicircular limiting plate (17) is provided at one side of the plug-in vertical arm (9).

3. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 2, characterized in that: The rotating force arm (8) is fixedly provided with a strip-shaped limiting convex rib (19) on both sides of the semicircular limiting plate (17) adjacent to the hinge shaft (10) at one end, and the rotating force arm installation groove (13) is fixedly provided with a strip-shaped limiting convex rib (20) matching the strip-shaped limiting convex rib (19) on both sides of the hinge shaft (10) at one end.

4. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 1, characterized in that: The butterfly wing plate (7) has a threaded hole (21) at one end near the conical nut head (3), a locking bolt (22) matching the threaded hole (21) is provided at one end near the conical nut head (3) on the side of the butterfly wing plate (7), a threaded hole (23) communicating with the plug-in slot (11) and matching the locking bolt (22) is provided at one end near the plug-in slot (11), and a threaded hole (24) matching the locking bolt (22) is provided on the plug connector (12).

5. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 1, characterized in that: An arc-shaped groove (25) is formed at one end of the butterfly-shaped side wing plate (7) away from the conical nut head (3), and an arc-shaped PVC seal (26) is arranged inside the arc-shaped groove (25). The arc-shaped PVC seal (26) is rotatably connected to the inside of the arc-shaped groove (25) via a second hinge shaft (27).

6. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 5, characterized in that: A plurality of arc-shaped limiting convex ribs (28) are fixedly arranged on both sides of the arc-shaped groove (25), and a plurality of arc-shaped limiting convex ribs (29) matching the arc-shaped limiting convex ribs (28) are fixedly arranged on both sides of the arc-shaped PVC sealing strip (26).

7. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 5, characterized in that: An inner installation groove (30) is provided at one end of the plug-in vertical arm (9) away from the plug connector (12), a pulling limit assembly (31) is provided inside the inner installation groove (30), and the pulling limit assembly (31) is connected to the arc-shaped PVC seal strip (26) via a pulling rope (32).

8. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 5, characterized in that: An inner buckle groove (33) is formed at one end of the outer side wall of the arc-shaped PVC sealing strip (26).

9. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 7, characterized in that: The pulling limit assembly (31) is composed of a central connecting column (34), a rope wheel (35) and a coil spring (36); the central connecting column (34) is fixedly connected to the central position inside the mounting inner groove (30); the rope wheel (35) is sleeved on the central connecting column (34); the coil spring (36) is connected between the central connecting column (34) and the rope wheel (35); and one end of the pulling rope (32) is connected to the rope wheel (35).

10. A nut having a butterfly-shaped head that is easy to tighten manually according to claim 7, characterized in that: Two limiting pressure wheels (37) and two limiting guide sleeves (38) are arranged on the side of the interior of the installation inner groove (30), and the pulling rope (32) is located between the two limiting pressure wheels (37) and inserted into the interior of the two limiting guide sleeves (38).

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