Fastening device for high-strength bolt

Abstract

The utility model relates to a fastening device for a high-strength bolt, and belongs to the technical field of auxiliary tools. Comprising an extension rod, a sleeve fixed to the bottom end of the extension rod, a mounting mechanism mounted in the sleeve, a fastener slidably connected to the interior of the sleeve, a circular plate fixed to the top end of the extension rod and a tightening mechanism mounted on the circular plate. The mounting mechanism comprises two mounting grooves formed in the sleeve. According to the fastening device for the high-strength bolt, the mounting mechanism is arranged in the sleeve, fasteners with different inner diameter sizes can be mounted, accordingly, the fasteners with different sizes can be replaced conveniently according to bolts with different outer diameter sizes, and the application range of the device is widened; and the device can adjust the extension length of the rotating rod relative to the circular plate according to the working space, so that the rotating rod is extended when the working space is large, and labor is saved when a worker tightens the device conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary tooling, in particular to a fastening device for high-strength bolts. Background Art

[0002] Bolts made of high-strength steel or that require a large pre-tightening force are called high-strength bolts. High-strength bolts are mostly used for the connection of bridges, rails, high-pressure and ultra-high-pressure equipment. The fracture of such bolts is mostly brittle fracture. High-strength bolts used in ultra-high-pressure equipment require a large prestress to ensure the sealing of the container.

[0003] For example, a fastening device for high-strength bolts in a Chinese patent (CN209551582U) belongs to the field of auxiliary tooling, and includes a sleeve, which is a plum blossom sleeve; an extension rod, one end of which is fixedly provided with a sleeve, and the center line of the sleeve is collinear with the center line of the extension rod; and a handle, which is provided at the other end of the extension rod, and includes a first handle and a second handle orthogonal to the first handle, the first handle and the second handle both vertically penetrate the extension rod, and there is a gap between the first handle and the second handle. The utility model can be used for high-strength bolts with high pressure levels but small space that cannot be tightened by using a percussion wrench, and there is no space to use a high-strength hydraulic wrench to tighten. It solves the technical problem that high-strength bolts cannot be effectively tightened due to insufficient position and space, so that valve flanges, flanges, and pipe flange bolts meet the strength requirements when tightened, and avoids problems such as secondary leakage. It is simple to make, easy to operate, and low in cost.

[0004] The above scheme also has the following technical deficiencies: the above scheme is not convenient for disassembling bolts with different outer diameters. Since different bolts have different outer diameters, sleeves with different inner diameters are required to tighten and disassemble the bolts. However, the size of the sleeve in the above scheme is fixed, and it can only disassemble bolts of the same size, and its scope of application is very limited. Based on this, a fastening device for high-strength bolts is proposed. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a fastening device for high-strength bolts, which has the advantage of being convenient for installing and disassembling bolts with different outer diameters, and solves the problem that the device can only disassemble bolts of fixed sizes.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fastening device for a high-strength bolt, comprising an extension rod, a sleeve fixed at the bottom end of the extension rod, a mounting mechanism installed inside the sleeve, a fastener slidably connected inside the sleeve, a circular plate fixed at the top end of the extension rod, and a tightening mechanism installed on the circular plate;

[0007] The installation mechanism comprises two installation grooves provided inside the sleeve, a reset assembly installed in the installation grooves, a handle fixed on the reset assembly and a connecting plate fixed on the top end of the fastener.

[0008] By adopting this technical solution, it is convenient to install fasteners with different inner diameters.

[0009] Furthermore, the tightening mechanism includes a movable groove opened inside the circular plate, a rotating rod slidably connected to the movable groove, a limiting assembly installed inside the rotating rod, a plurality of limiting holes opened at the top of the circular plate, a sliding block fixed at the bottom end of the rotating rod, and an anti-slip sleeve fixed on the outer surface of the rotating rod.

[0010] By adopting this technical solution, it is convenient to adjust the extension length of the rotating rod according to the working space.

[0011] Furthermore, the reset assembly includes a limit rod slidably connected to the inside of the installation groove, a movable plate fixed to the outer surface of the limit rod, and a first spring sleeved on the outer surface of the limit rod.

[0012] By adopting this technical solution, it is convenient to drive the limiting rod into the connecting groove.

[0013] Furthermore, the limiting assembly includes a second spring fixed inside the rotating rod, a connecting block fixed at the top end of the second spring, and a pressing block fixed at the top end of the connecting block.

[0014] By adopting this technical solution, it is convenient to limit the rotating rod by abutting the connecting block and the pressing block against the limiting hole.

[0015] Furthermore, two connecting grooves are provided inside the sleeve, and the two connecting plates are placed in the corresponding connecting grooves.

[0016] By adopting this technical solution, it is convenient to use the connecting plate to fix the fastener in the sleeve.

[0017] Furthermore, a connecting hole is provided inside the connecting plate, and the two limiting rods can abut against the corresponding connecting holes.

[0018] By adopting this technical solution, the connection plate can be fixed by abutting the limiting rod in the connection hole.

[0019] Furthermore, two sliding grooves are provided inside the circular plate, and the sliding block slides in the corresponding sliding grooves.

[0020] By adopting this technical solution, the sliding block can be used to slide in the sliding groove to limit the rotating rod.

[0021] Furthermore, a placement slot is provided inside the rotating rod, the bottom end of the second spring is fixed to the bottom side of the placement slot, and the pressing block and the connecting block are located in one of the limiting holes.

[0022] By adopting this technical solution, it is convenient to press the connecting block and the pressing block, thereby facilitating the adjustment of the extension length of the rotating rod.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0024] The fastening device for high-strength bolts is capable of installing fasteners with different inner diameters by providing an installation mechanism inside the sleeve, thereby facilitating replacement of fasteners of different sizes according to bolts of different outer diameters, thereby improving the application range of the device. By providing a tightening mechanism on the circular plate, the device can adjust the protruding length of the rotating rod relative to the circular plate according to the working space, thereby extending the rotating rod when the working space is large, which is convenient for workers to save effort when tightening. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 It is a structural schematic diagram of the installation mechanism of the utility model;

[0027] Figure 3 It is a three-dimensional schematic diagram of the structural fastener connection structure of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the tightening mechanism of the utility model.

[0029] In the figure: 1. extension rod; 2. sleeve; 300. installation mechanism; 301. installation groove; 302. limit rod; 303. moving plate; 304. first spring; 305. handle; 306. connecting plate; 4. fastener; 5. round plate; 600. tightening mechanism; 601. moving groove; 602. rotating rod; 603. second spring; 604. connecting block; 605. pressing block; 606. limit hole; 607. slider; 608. anti-slip sleeve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] See also Figure 1-4 The fastening device for high-strength bolts in this embodiment includes an extension rod 1, a sleeve 2 fixed at the bottom end of the extension rod 1, a mounting mechanism 300 installed inside the sleeve 2, a fastener 4 slidably connected inside the sleeve 2, a circular plate 5 fixed at the top end of the extension rod 1, and a tightening mechanism 600 installed on the circular plate 5.

[0032] The installation mechanism 300 in this embodiment is used to facilitate the installation of fasteners 4 of different sizes, the tightening mechanism 600 is used to increase the force arm to facilitate the tightening of the bolts, and the circular plate 5 is used to facilitate the installation of the tightening mechanism 600.

[0033] See also Figure 1-3 In order to facilitate the replacement of fasteners 4 with different inner diameters, the mounting mechanism 300 in this embodiment includes two mounting grooves 301 provided inside the sleeve 2, a reset assembly installed in the mounting grooves 301, a handle 305 fixed on the reset assembly, and a connecting plate 306 fixed on the top of the fastener 4, the reset assembly includes a limit rod 302 slidably connected inside the mounting grooves 301, a movable plate 303 fixed on the outer surface of the limit rod 302, and a first spring 304 sleeved on the outer surface of the limit rod 302, two connecting grooves are provided inside the sleeve 2, two connecting plates 306 are placed in the corresponding connecting grooves, a connecting hole is provided inside the connecting plate 306, and the two limit rods 302 can abut against the corresponding connecting holes.

[0034] The installation mechanism 300 in this embodiment fixes the connecting plate 306 and the fastener 4 by abutting the limiting rod 302 against the connecting hole of the connecting plate 306, the first spring 304 is used to drive the limiting rod 302 to reset, the handle 305 is used to facilitate pulling the limiting rod 302 to move, and the movable plate 303 is used to facilitate compressing the first spring 304.

[0035] It should be noted that one side of the first spring 304 abuts against one side of the movable plate 303 , and the other side of the first spring 304 abuts against the other side of the installation groove 301 . The connection groove is used to facilitate the placement of the connection plate 306 .

[0036] See also Figure 1 and Figure 4In order to facilitate tightening the bolts, the tightening mechanism 600 in this embodiment includes a moving groove 601 opened in the circular plate 5, a rotating rod 602 slidably connected to the moving groove 601, a limiting assembly installed in the rotating rod 602, a plurality of limiting holes 606 opened at the top of the circular plate 5, a slider 607 fixed at the bottom end of the rotating rod 602 and an anti-slip sleeve 608 fixed to the outer surface of the rotating rod 602, the limiting assembly includes a second spring 603 fixed in the rotating rod 602, a connecting block 604 fixed at the top of the second spring 603 and a pressing block 605 fixed at the top of the connecting block 604, two sliding grooves are opened in the circular plate 5, the slider 607 slides in the corresponding sliding grooves, a placement groove is opened in the rotating rod 602, the bottom end of the second spring 603 is fixed to the bottom side of the placement groove, and the pressing block 605 and the connecting block 604 are located in one of the limiting holes 606.

[0037] The tightening mechanism 600 in this embodiment fixes the rotating rod 602 by abutting the pressing block 605 and the connecting block 604 in the limiting hole 606. The second spring 603 is used to facilitate pressing the pressing block 605 and the connecting block 604 into the movable groove 601, thereby facilitating the extension and contraction of the rotating rod 602. The pressing block 605 is used to facilitate pressing the pressing block 605 and the connecting block 604 downward.

[0038] It should be noted that the anti-slip sleeve 608 is used to prevent the rotating rod 602 from slipping during rotation, and the sliding block 607 can limit the rotating rod 602 by sliding in the sliding groove.

[0039] The working principle of the above embodiment is:

[0040] When the bolt needs to be tightened, a fastener 4 with a suitable inner diameter is selected and the handle 305 is pulled. The handle 305 drives the limiting rod 302 to move. The limiting rod 302 drives the moving plate 303 to compress the first spring 304. At the same time, the limiting rod 302 leaves the connecting groove, and the connecting plate 306 is placed in the connecting groove. The fastener 4 is placed in the interior of the sleeve 2, and the handle 305 is released. The limiting rod 302 enters the connecting hole under the action of the deformation recovery of the first spring 304 to fix the connecting plate 306. When the bolt needs to be tightened, the fastener 4 is placed on the outer surface of the bolt, and then the pressing block 60 is squeezed downward. 5. The pressing block 605 drives the connecting block 604 to move downward, and the connecting block 604 squeezes the second spring 603 to move the rotating rod 602. The rotating rod 602 drives the pressing block 605, the connecting block 604 and the second spring 603 to move. When the pressing block 605 moves to the position corresponding to the next limiting hole 606, the second spring 603 recovers its deformation and drives the connecting block 604 and the pressing block 605 to reset. At this time, according to the size of the working space and the difficulty of tightening, you can choose to continue to adjust the extension length of the rotating rod 602 or rotate the rotating rod 602 at this length to tighten the bolt.

Claims

1. A fastening device for a high-strength bolt, comprising an extension rod (1), a sleeve (2) fixed at the bottom end of the extension rod (1), a mounting mechanism (300) mounted inside the sleeve (2), a fastener (4) slidably connected inside the sleeve (2), a circular plate (5) fixed at the top end of the extension rod (1), and a tightening mechanism (600) mounted on the circular plate (5); The mounting mechanism (300) comprises two mounting grooves (301) provided inside the sleeve (2), a reset assembly mounted in the mounting grooves (301), a handle (305) fixed on the reset assembly, and a connecting plate (306) fixed on the top end of the fastener (4).

2. The fastening device for high-strength bolts according to claim 1, characterized in that: The tightening mechanism (600) comprises a movable groove (601) provided inside the circular plate (5), a rotating rod (602) slidably connected inside the movable groove (601), a limiting assembly installed inside the rotating rod (602), a plurality of limiting holes (606) provided at the top end of the circular plate (5), a sliding block (607) fixed at the bottom end of the rotating rod (602), and an anti-slip sleeve (608) fixed to the outer surface of the rotating rod (602).

3. The fastening device for high-strength bolts according to claim 1, characterized in that: The reset assembly comprises a limit rod (302) slidably connected to the interior of the installation groove (301), a movable plate (303) fixed to the outer surface of the limit rod (302), and a first spring (304) sleeved on the outer surface of the limit rod (302).

4. The fastening device for high-strength bolts according to claim 2, characterized in that: The limiting assembly comprises a second spring (603) fixed inside the rotating rod (602), a connecting block (604) fixed at the top end of the second spring (603), and a pressing block (605) fixed at the top end of the connecting block (604).

5. The fastening device for high-strength bolts according to claim 3, characterized in that: Two connection grooves are provided inside the sleeve (2), and the two connection plates (306) are placed in the corresponding connection grooves.

6. The fastening device for high-strength bolts according to claim 3, characterized in that: A connection hole is provided inside the connection plate (306), and the two limit rods (302) can abut against the corresponding connection holes.

7. The fastening device for high-strength bolts according to claim 2, characterized in that: Two sliding grooves are provided inside the circular plate (5), and the sliding block (607) slides in the corresponding sliding grooves.

8. The fastening device for high-strength bolts according to claim 4, characterized in that: A placement slot is provided inside the rotating rod (602), the bottom end of the second spring (603) is fixed to the bottom side of the placement slot, and the pressing block (605) and the connecting block (604) are located in one of the limiting holes (606).

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