Bolt with step-by-step screwing-out structure after nut head is damaged

Abstract

The utility model relates to a bolt with a step-by-step screwing-out structure after a nut head is damaged, which comprises a nut head and a screw rod part, the screw rod part is fixedly connected with the nut head, an external thread is arranged on the screw rod part far away from the nut head, and a nut end is arranged on the screw rod part close to the nut head; a middle hole and a middle rod are arranged on the screw rod part, the middle rod is connected with the screw rod part through the middle hole, and the middle hole penetrates through the screw rod part; a middle groove is formed in the nut end, and the middle groove and the middle hole intersect; an internal thread is arranged on the middle rod, the spiral direction of the internal thread is opposite to that of the external thread, and the internal thread is located on the portion, close to the nut head, of the middle rod. The internal thread is located in the nut end. According to the bolt with the step-by-step screwing-out structure after the nut head is damaged, a broken screw rod can be taken away from a threaded hole quickly, and the time for taking away the broken screw rod from the threaded hole is saved.

Description

Technical Field

[0001] The utility model relates to the field of bolts, in particular to a bolt with a structure that can be unscrewed in steps after a nut head is damaged. Background Art

[0002] Fasteners are a type of connector commonly used in industrial production, used to stably connect two separate parts together; fasteners include rivets, keys, pins, bolts and other connectors, among which bolts are the most commonly used fasteners; bolts include nut heads and screw parts.

[0003] During the use of bolts, in order to tighten the bolts, the operator will use as much force as possible to rotate the bolts through a wrench. Since the force on the bolts is certain, they will deform when subjected to excessive force until the nut head falls off the screw, leaving the screw in the threaded hole. It is very troublesome to remove the broken screw in the threaded hole, and it is very time-consuming to use an electric spark machine to burn the screw left in the threaded hole. This problem is urgently needed. Utility Model Content

[0004] The utility model aims to provide a bolt with a structure that can be unscrewed in steps after the nut head is damaged, so as to solve the above problems.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A bolt with a structure that can be unscrewed in steps after a nut head is damaged, comprising a nut head and a screw portion, wherein the screw portion is fixedly connected to the nut head, an external thread is arranged on the screw portion away from the nut head, and a nut end is arranged on the screw portion close to the nut head; a middle hole and a middle rod are arranged on the screw portion, the middle rod is connected to the screw portion through the middle hole, and the middle hole passes through the screw portion;

[0007] A middle groove is provided on the nut end, and the middle groove intersects with the middle hole;

[0008] The middle rod is provided with an internal thread, the spiral direction of the internal thread is opposite to that of the external thread, and the internal thread is located on the middle rod near the nut head; the internal thread is located inside the nut end.

[0009] Furthermore, the middle rod is located in the middle of the screw rod portion, and the middle rod is made of a rigid material.

[0010] Furthermore, the cross section of the middle rod is circular, the axis of the middle rod coincides with the axis of the screw portion, and the material of the middle rod is metal.

[0011] Furthermore, the middle rod and the middle hole are interference fit, the surface of the middle rod is a smooth surface, and the material of the middle rod is specifically carbon steel.

[0012] Furthermore, the cross-sectional diameter of the middle rod close to the nut head is not greater than the cross-sectional diameter of the middle rod away from the nut head, and the inner wall of the middle hole is a smooth inner wall.

[0013] Furthermore, the length of the internal thread matches the length of the nut end.

[0014] Furthermore, the middle hole is a circular hole, and the middle groove passes through the radial direction of the nut end.

[0015] Furthermore, the middle groove passes through one end of the nut end toward the nut head.

[0016] Furthermore, the cross section of the middle groove is rectangular, the middle groove coincides with the diameter direction of the screw portion, and the middle groove is separated from the external thread.

[0017] Furthermore, the middle groove is in a straight line shape, and a chamfer is arranged on the middle groove, the chamfer is located at the place where the nut end contacts the nut head, and the width of the middle groove is one quarter of the diameter of the screw part.

[0018] The beneficial effects of the utility model are as follows: a structural bolt with a function of unscrewing out in steps after a nut head is damaged is provided; the nut head, the screw rod part, the middle groove, the middle hole and the middle rod are used in coordination with each other to manufacture a structural bolt with a function of unscrewing out in steps after a nut head is damaged to replace a traditional bolt, so that the screw rod can be taken out from the threaded hole in steps after the nut head of the bolt is damaged, so that a broken screw rod can be quickly removed from the threaded hole, and the time for removing the broken screw rod from the threaded hole is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axonometric diagram of the overall structure of a structural bolt with a step-by-step unscrewing structure after a nut head is damaged according to the utility model.

[0020] Figure 2 It is a partial structural axonometric diagram of a structural bolt with a step-by-step unscrewing function after a nut head is damaged according to the utility model.

[0021] Figure 3 It is a partial structural front view of a structural bolt with a step-by-step unscrewing function after a nut head is damaged according to the utility model.

[0022] In the figure: 1. nut head; 2. screw part; 3. middle hole; 4. middle groove; 5. middle rod; 6. internal thread; 7. external thread; 8. nut end. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described in the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0024] In the description of the present utility model, it is necessary to understand that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features, and in the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] refer to Figures 1 to 3 , a structural bolt with a step-by-step unscrewing function after a nut head is damaged, comprising a nut head 1 and a screw portion 2, the screw portion 2 being fixedly connected to the nut head 1, the screw portion 2 being provided with an external thread 7 away from the nut head 1, for connecting with a threaded hole when the bolt is used, and the screw portion 2 being provided with a nut end 8 near the nut head 1; characterized in that: a middle hole 3 and a middle rod 5 are provided on the screw portion 2, the middle rod 5 being connected to the screw portion 2 through the middle hole 3, for first removing the middle rod 5 before removing the screw portion 2, so as to facilitate the later removal of the screw portion 2, and the middle hole 3 passes through the screw portion 2;

[0026] The nut end 8 is provided with a middle groove 4 for facilitating the use of a flat screwdriver to rotate the screw portion 2, and the middle groove 4 intersects with the middle hole 3;

[0027] The middle rod 5 is provided with an internal thread 6 for facilitating the removal of the middle rod using a screw. The spiral direction of the internal thread 6 is opposite to the spiral direction of the external thread 7. When the middle rod 5 is removed, the firmness of the external thread 7 and the threaded hole on the screw part 2 can be reduced. The internal thread 6 is located on the middle rod 5 near the nut head 1; the internal thread 6 is located inside the nut end 8 for facilitating the connection between the screw and the internal thread 6.

[0028] The middle rod 5 is located in the middle of the screw rod portion 2 and is made of a rigid material to prevent the middle rod 5 from being deformed.

[0029] The cross-section of the middle rod 5 is circular, which is used to ensure that the middle rod 5 can be removed from the middle hole 3 when it is rotated. The axis of the middle rod 5 coincides with the axis of the screw part 2. The material of the middle rod 5 is metal, which is used to prevent the middle rod 5 from deformation.

[0030] The middle rod 5 and the middle hole 3 are interference fit to ensure the stability of the connection. The surface of the middle rod 5 is a smooth surface. The material of the middle rod 5 is specifically carbon steel to prevent the middle rod 5 from deformation.

[0031] The cross-sectional diameter of the middle rod 5 close to the nut head 1 is not larger than the cross-sectional diameter of the middle rod 5 away from the nut head 1, so as to ensure that the middle rod 5 can be removed from the middle hole 3 when being rotated. The inner wall of the middle hole 3 is a smooth inner wall.

[0032] The length of the internal thread 6 matches the length of the nut end 8 .

[0033] The middle hole 3 is a circular hole, and the middle groove 4 passes through the radial direction of the nut end 8 to ensure that the middle rod 5 can be removed from the middle hole 3 when it is rotated.

[0034] The middle groove 4 passes through one end of the nut end 8 toward the nut head 1 , so as to facilitate the insertion of a flat-blade screwdriver into the middle groove 4 .

[0035] The cross section of the middle groove 4 is rectangular, which is used to facilitate the insertion of a flat-blade screwdriver into the middle groove 4 . The diameter direction of the middle groove 4 coincides with that of the screw portion 2 , and the middle groove 4 is separated from the external thread 7 .

[0036] The middle groove 4 is a straight groove, and a chamfer is provided on the middle groove 4 to facilitate the insertion of a flat-blade screwdriver into the middle groove 4. The chamfer is located where the nut end 8 contacts the nut head 1. The width of the middle groove 4 is one-fourth of the diameter of the screw portion 2.

[0037] The working principle of the utility model is as follows: before using a structural bolt with a nut head that can be unscrewed step by step after being damaged, the structural bolt with a nut head that can be unscrewed step by step after being damaged is taken out, and when using a structural bolt with a nut head that can be unscrewed step by step after being damaged; the screw rod part 2 is inserted into the threaded hole, and then the operator rotates the bolt through the wrench and the nut head 1. When the bolt is subjected to excessive force, the nut head 1 separates from the screw rod part 2, and the screw rod part 2 needs to be removed from the threaded hole; in this process, the operator first locks a screw that matches the internal thread 6 on the middle rod 5, and then the operator continues to rotate the screw. In this process, the screw drives the middle rod 5 to rotate in the middle hole 3, and the operator applies a pulling force to make the middle rod 5 leave the middle hole 3 of the screw during the rotation. Further, the operator places the flat-blade screwdriver into the middle groove 4, and then the operator rotates the flat-blade screwdriver, thereby rotating the remaining part of the screw rod out of the threaded hole; the above process is maintained until the screw rod part 2 is completely rotated out of the threaded hole.

[0038] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field of the present invention, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A bolt with a structure that can be unscrewed in steps after a nut head is damaged, comprising a nut head (1) and a screw portion (2), wherein the screw portion (2) is fixedly connected to the nut head (1), an external thread (7) is provided on the screw portion (2) away from the nut head (1), and a nut end (8) is provided on the screw portion (2) close to the nut head (1); characterized in that: The screw portion (2) is provided with a middle hole (3) and a middle rod (5), the middle rod (5) is connected to the screw portion (2) through the middle hole (3), and the middle hole (3) passes through the screw portion (2); The nut end (8) is provided with a middle groove (4), and the middle groove (4) and the middle hole (3) intersect; The middle rod (5) is provided with an internal thread (6), the spiral direction of the internal thread (6) is opposite to the spiral direction of the external thread (7), and the internal thread (6) is located on the middle rod (5) near the nut head (1); the internal thread (6) is located inside the nut end (8).

2. A structural bolt with step-by-step unscrewing after the nut head is damaged according to claim 1, characterized in that: The middle rod (5) is located in the middle of the screw rod portion (2), and the middle rod (5) is made of a rigid material.

3. A bolt with a structure for unscrewing the nut head in steps after it is damaged according to claim 2, characterized in that: The cross section of the middle rod (5) is circular, the axis of the middle rod (5) coincides with the axis of the screw portion (2), and the material of the middle rod (5) is metal.

4. A bolt with a structure for unscrewing the nut head in steps after it is damaged according to claim 3, characterized in that: The middle rod (5) and the middle hole (3) are interference fit, the surface of the middle rod (5) is a smooth surface, and the material of the middle rod (5) is specifically carbon steel.

5. A structural bolt with step-by-step unscrewing after the nut head is damaged according to claim 4, characterized in that: The cross-sectional diameter of the middle rod (5) close to the nut head (1) is not greater than the cross-sectional diameter of the middle rod (5) away from the nut head (1), and the inner wall of the middle hole (3) is a smooth inner wall.

6. A bolt with a structure for unscrewing the nut head in steps after it is damaged according to claim 1, characterized in that: The length of the internal thread (6) matches the length of the nut end (8).

7. A structural bolt with step-by-step unscrewing after the nut head is damaged according to claim 1, characterized in that: The middle hole (3) is a circular hole, and the middle groove (4) passes through the radial direction of the nut end (8).

8. A bolt with a structure for unscrewing the nut head in steps after it is damaged according to claim 7, characterized in that: The middle groove (4) passes through the nut end (8) and faces one end of the nut head (1).

9. A structural bolt with step-by-step unscrewing after the nut head is damaged according to claim 8, characterized in that: The cross section of the middle groove (4) is rectangular, the middle groove (4) coincides with the diameter direction of the screw portion (2), and the middle groove (4) is separated from the external thread (7).

10. A structural bolt with step-by-step unscrewing after the nut head is damaged according to claim 9, characterized in that: The middle groove (4) is a straight groove, and a chamfer is provided on the middle groove (4). The chamfer is located at the place where the nut end (8) contacts the nut head (1). The width of the middle groove (4) is one quarter of the diameter of the screw part (2).

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