Tightening and clamping device for paired bolts and bolt fastening method

Abstract

The invention discloses a tightening and clamping device for paired bolts and a bolt fastening method. The clamping device comprises a first connecting arm and a second connecting arm, one end of the first connecting arm is hinged to one end of the second connecting arm through a hinge shaft, a first sleeve is installed at the other end of the first connecting arm, and a second sleeve is installed at the other end of the second connecting arm; a groove is formed in the middle of the hinge shaft, the cross section of the bottom face of the groove is in an arc shape, so that an eccentric wheel face is formed in the middle of the hinge shaft, the first connecting arm is connected with the cylindrical face of the hinge shaft, and the second connecting arm is connected with the eccentric wheel face of the hinge shaft. A rocker arm is fixedly installed at one end of the hinge shaft, and the eccentric wheel face is perpendicular to the longitudinal direction of the rocker arm and is arranged back to back to the rocker arm. The bolt fastening and clamping efficiency and the clamp dismounting efficiency are improved, and damage to workpiece paint is effectively avoided.

Description

Technical Field

[0001] The invention relates to a bolt tightening and clamping device, in particular to a tightening and clamping device for paired bolts and a bolt tightening method. Background Art

[0002] Bolts are fasteners consisting of a head and a threaded rod. Traditionally, bolt tightening involves manually gripping the bolt head with a socket wrench, fork-end wrench, or similar tool, and then tightening the matching nut with a torque wrench. This traditional tightening method makes it difficult to manually grip the bolt head with a socket wrench or fork-end wrench when the torque exceeds 400 Nm. The nut is typically tightened by placing the wrench against the workpiece. However, after the nut is tightened, the wrench holding the bolt head cannot rotate, creating significant stress between the wrench and the workpiece. This makes disassembly difficult and can damage the paint on the workpiece, even causing local deformation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the inconvenience of bolt tightening at high torque, and to provide a tightening clamping device for paired bolts and a bolt tightening method that are easy to disassemble.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A tightening and clamping device for paired bolts, the structural features of which are:

[0006] The first connecting arm comprises a first connecting arm and a second connecting arm, wherein one end of the first connecting arm and one end of the second connecting arm are hingedly connected via a hinge shaft, a first sleeve is mounted on the other end of the first connecting arm, and a second sleeve is mounted on the other end of the second connecting arm;

[0007] A groove is provided in the middle of the hinge shaft, and the cross section of the bottom surface of the groove is arc-shaped, so that the middle of the hinge shaft forms an eccentric wheel surface, the first connecting arm is connected to the cylindrical surface of the hinge shaft, and the second connecting arm is connected to the eccentric wheel surface of the hinge shaft;

[0008] A rocker arm is fixedly mounted on one end of the hinge shaft, and the eccentric wheel surface is perpendicular to the longitudinal direction of the rocker arm and is arranged in the back direction of the rocker arm.

[0009] When the present invention is used, the first and second sleeves are respectively sleeved on the heads of the two bolts to form the interlocking of the first and second connecting arms to achieve clamping of the heads of the two bolts. After the nuts matching the two bolts are tightened, the rocker arm is rotated to make the eccentric wheel surface face away from the second sleeve. During the rotation of the eccentric wheel surface, the distance between the edge contact position and the center point of the eccentric wheel is reduced, which offsets the stress generated between the first and second connecting arms. The clamping device of the present invention can be easily removed from the bolt, thereby achieving the purpose of quick and labor-saving disassembly.

[0010] Preferably, the rocker arm is mounted on the hinge shaft by clamping with a first nut and a second nut.

[0011] Preferably, a spring washer and a flat washer are installed between the second nut and the first and second connecting arms, and the spring washer is in a semi-compressed state. This allows the present invention to lock the rocker arm in place by utilizing the elastic force of the spring washer, preventing the rocker arm from rotating, thereby enabling bolt tightening without having to manually hold the rocker arm.

[0012] Preferably, the depth of the groove is 4-5 mm.

[0013] Preferably, the first sleeve and the second sleeve are plum blossom sleeves.

[0014] Preferably, the connection between the first connecting arm and the first sleeve, and the connection between the second connecting arm and the second sleeve are respectively achieved through quick-release structures to adapt to the fastening use of bolts of different specifications.

[0015] Based on the same inventive concept, the present invention also provides a method for tightening bolts using the paired bolt tightening clamping device, which comprises the following steps:

[0016] 1) Sleeve the first sleeve and the second sleeve onto the heads of the two bolts arranged in pairs, and rotate the rocker arm so that the eccentric wheel faces the first sleeve;

[0017] 2) After tightening the fastening nuts of the two bolts using a torque wrench, rotate the rocker arm so that the eccentric wheel surface faces away from the second sleeve, and then the clamping device can be removed from the bolt head.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) When the present invention is used, the interlocking structure formed by the first and second connecting arms can clamp two bolts at the same time, improving the clamping efficiency by 50%;

[0020] 2) The first and second connecting arms of the present invention are hinged via a hinge shaft, which facilitates adjustment of the distance between the first and second sleeves;

[0021] 3) The present invention utilizes the interlocking structure formed by the first and second connecting arms to replace the original wrench to abut the workpiece for tightening, which not only eliminates internal stress and facilitates disassembly, thereby increasing the disassembly efficiency of the bolt clamp by more than 80%, but also avoids damage to the workpiece paint. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0024] Figure 2 for Figure 1 Schematic diagram of the right view structure.

[0025] Figure 3 for Figure 1 Schematic diagram of the top view structure.

[0026] Figure 4 This is a schematic diagram of the main structure of an embodiment of a hinge shaft.

[0027] Figure 5 for Figure 4 A-A sectional view, where R is the radius of the eccentric wheel surface.

[0028] In the figure: 1. first connecting arm, 2. hinge shaft, 3. second connecting arm, 4. first sleeve, 5. rocker arm, 6. first nut, 7. spring washer, 8. flat washer, 9. second sleeve, 10. second nut, 11. groove, 12. arc, 13. eccentric wheel surface, 14. cylindrical surface. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific preferred embodiments, but the scope of protection of the present invention is not limited thereby.

[0030] In the description of the present invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] See also Figure 1 An embodiment of the tightening and clamping device for paired bolts of the present invention includes a first connecting arm 1 and a second connecting arm 3. One end of the first connecting arm 1 and one end of the second connecting arm 3 are hingedly connected via a hinge shaft 2. A first sleeve 4 is installed at the other end of the first connecting arm 1, and a second sleeve 9 is installed at the other end of the second connecting arm 3.

[0033] A groove 11 with a depth of 4-5 mm is provided in the middle of the articulated shaft 2. The cross section of the bottom surface of the groove 11 is an arc 12, so that an eccentric wheel surface 13 is formed in the middle of the articulated shaft 2. The first connecting arm 1 is connected to the cylindrical surface 14 of the articulated shaft 2, and the second connecting arm 3 is connected to the eccentric wheel surface 13 of the articulated shaft 2.

[0034] The rocker arm 5 is fixedly mounted on one end of the hinge shaft 2 , and the eccentric wheel surface 13 is perpendicular to the longitudinal direction of the rocker arm 5 and is arranged opposite to the rocker arm 5 .

[0035] In this embodiment, the hinge shaft 2 is provided with threads, and the rocker arm 5 is clamped and mounted on the hinge shaft 2 by a first nut 6 and a second nut 10 that are threadedly connected to the hinge shaft 2. The hinge shaft 2 is preferably a bolt.

[0036] Preferably, a spring washer 7 and a flat washer 8 are installed between the second nut 10 and the first connecting arm 1 and the second connecting arm 3, and the spring washer 7 is in a semi-compressed state, so that when the present invention is in use, the elastic force of the spring washer 7 can be used to lock the position of the rocker arm 5 to prevent the rocker arm 5 from rotating, thereby achieving the tightening of the bolt to be tightened without holding the rocker arm 5 by hand.

[0037] The first sleeve 4 and the second sleeve 9 are preferably plum blossom sleeves to facilitate common bolt fastening.

[0038] The connection between the first connecting arm 1 and the first sleeve 4, and the connection between the second connecting arm 3 and the second sleeve 9 are preferably achieved by a quick-release structure to facilitate the replacement of the first sleeve 4 and the second sleeve 9 and adapt to different bolt specifications.

[0039] When the present invention is used, the tightening and clamping device for paired bolts includes the following steps:

[0040] 1) After inserting the first sleeve 4 and the second sleeve 10 onto the heads of the two bolts arranged in pairs, rotate the rocker arm 5 so that the eccentric wheel surface 13 of the hinge shaft 2 faces the first sleeve 4. The interlocking of the first connecting arm 1 and the second connecting arm 3 can then be used to clamp the two bolts (without holding the rocker arm by hand);

[0041] 2) Use a torque wrench to tighten the fastening nuts of the two bolts. Then, rotate the rocker arm 5 so that the eccentric wheel surface faces away from the second sleeve 10. During the rotation of the rocker arm 5, due to the presence of the eccentric wheel surface 13, the second connecting arm 3 is displaced by 4 to 5 mm relative to the hinge shaft 2, which can release the stress generated during the tightening process, thereby easily removing the clamping device of the present invention from the bolt head.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention using the technical content disclosed above, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiment in accordance with the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A tightening and clamping device for paired bolts, characterized in that: The first connecting arm comprises a first connecting arm and a second connecting arm, wherein one end of the first connecting arm and one end of the second connecting arm are hingedly connected via a hinge shaft, a first sleeve is mounted on the other end of the first connecting arm, and a second sleeve is mounted on the other end of the second connecting arm; A groove is provided in the middle of the hinge shaft, and the cross section of the bottom surface of the groove is arc-shaped, so that the middle of the hinge shaft forms an eccentric wheel surface, the first connecting arm is connected to the cylindrical surface of the hinge shaft, and the second connecting arm is connected to the eccentric wheel surface of the hinge shaft; A rocker arm is fixedly mounted on one end of the hinge shaft, and the eccentric wheel surface is perpendicular to the longitudinal direction of the rocker arm and is arranged in the back direction of the rocker arm.

2. The tightening clamping device for paired bolts according to claim 1, characterized in that: The rocker arm is mounted on the hinge shaft by being clamped by a first nut and a second nut.

3. The tightening and clamping device for paired bolts according to claim 2, characterized in that: A spring washer and a flat washer are installed between the second nut and the first connecting arm and the second connecting arm, and the spring washer is in a semi-compressed state.

4. The tightening and clamping device for paired bolts according to claim 1, characterized in that: The depth of the groove is 4-5 mm.

5. The tightening and clamping device for paired bolts according to claim 1, characterized in that: The first sleeve and the second sleeve are plum blossom sleeves.

6. The tightening and clamping device for paired bolts according to claim 1, characterized in that: The connection between the first connecting arm and the first sleeve, and the connection between the second connecting arm and the second sleeve are respectively achieved through quick-release structures.

7. A method for fastening bolts using the tightening and clamping device for paired bolts according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) Sleeve the first sleeve and the second sleeve onto the heads of the two bolts arranged in pairs, and rotate the rocker arm so that the eccentric wheel faces the first sleeve; 2) After tightening the fastening nuts of the two bolts using a torque wrench, rotate the rocker arm so that the eccentric wheel surface faces away from the second sleeve, and then the clamping device can be removed from the bolt head.

Images