CN205021137U - Double -stage bolt stretching device - Google Patents

Abstract

The utility model discloses a two-stage bolt tensioner, which comprises a support, a pull rod placed inside the support, a cylinder body 1 fixedly installed with the support, a cylinder body 2 fixedly installed with the cylinder body 1, and a cylinder body connected with the cylinder body. Two fixedly installed cylinder heads, cylinder body one and cylinder body two are respectively sealed with piston one and piston two, and piston one and piston two are in contact with each other; the center of piston two is fitted with a nut, and the nut is fixedly installed with the pull rod; the nut A reset spring is fixed between the upper surface and the cylinder head; the pull rod passes through the piston 1 and the piston 2, and is mounted on the nut; the end of the pull rod is provided with a bolt interface; the cylinder body 1 and the cylinder body 2 are installed There is an oil circuit assembly, and the oil circuit pipeline is connected; a series gear set is fixedly arranged on the support, one end gear of the gear set is fixed on the support, and the other end is fixedly provided with a wrench shaft.

Description

A two-stage bolt tensioner

technical field

The utility model relates to the technical field of bolt fastening devices, in particular to a two-stage bolt tensioner.

Background technique

At present, in some large-scale operations, especially during aerial operations, it is necessary to rely on manpower to fasten the bolts to meet the required requirements during the bolt installation process, resulting in excessive labor intensity and low efficiency. Moreover, there will also be uneven torque during the fastening process, which will cause the fastening effect of the bolts to not be well exerted, resulting in low installation quality, and also increase the number of times and difficulty of maintenance.

Therefore, developing a bolt fastening device with labor-saving and uniform torque has become an urgent problem to be solved by people in the industry.

Utility model content

Aiming at the above-mentioned technical problems in the related art, the utility model proposes a two-stage bolt tensioner, which can save labor, and the torque is uniform and accurate during tightening, reducing labor intensity.

For realizing above-mentioned technical purpose, technical scheme of the present utility model is realized like this:

A two-stage bolt tensioner, comprising a support, a tie rod placed inside the support, cylinder one fixedly installed with the support, cylinder two fixedly installed with the cylinder one, and the cylinder two fixedly installed with the cylinder The cylinder head fixedly installed in the cylinder body two, wherein:

The cylinder body 1 and the cylinder body 2 are respectively sealed with piston 1 and piston 2, and the piston 1 and piston 2 are in contact with each other;

The two centers of the piston are fitted with a nut, and the nut is fixedly installed with the pull rod;

A return spring is fixedly arranged between the upper surface of the nut and the cylinder head;

The pull rod passes through the first piston and the second piston, and is fitted on the nut;

The end of the tie rod is provided with a bolt interface;

The cylinder body 1 and the cylinder body 2 are installed with an oil circuit assembly, and the oil circuit pipeline is connected;

A gear set in series is fixedly arranged on the support, one end of the gear set is fixed on the support, and a wrench shaft is fixed at the other end.

Further, the support is fixedly connected to the cylinder body through a top screw.

Further, the centers of the first piston and the second piston are respectively provided with holes that cooperate with the pull rods.

Further, the upper end of the pull rod is provided with an external thread that cooperates with the nut.

Further, the first cylinder is provided with an external thread fixedly connected with the second cylinder, and the second cylinder is cooperatingly provided with an internal thread.

Further, the cylinder body 2 is provided with external threads fixedly connected with the cylinder head, and the cylinder head is provided with internal threads.

Further, there is hydraulic oil between the inside of the first cylinder and the first piston, and between the second cylinder and the second piston.

Further, the outer surfaces of the cylinder body 1, the cylinder body 2 and the cylinder head are all provided with anti-skid lines.

The beneficial effects of the utility model: when tightening the bolts, the hydraulic oil enters the cylinder body, pushes the pull rod upward to press the bolts, and tightens the bolts by turning the lever, which is convenient to use, improves efficiency, reduces labor intensity, and the bolt tightening torque is even. Accurate, greatly improving the quality of installation and maintenance, shortening the maintenance cycle, improving work efficiency, convenient and practical.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is a cross-sectional view of a two-stage bolt tensioner according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of a two-stage bolt tensioner according to an embodiment of the present invention.

In the picture:

1. Support; 2. Cylinder block 1; 3. Piston 1; 4. Nut; 5. Return spring; 6. Cylinder head; 7. Oil circuit assembly; 8. Wrench shaft; 9. Gear; 10. Pull rod; 11 , Cylinder body two; 12, Piston two; 13, Bolt interface.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

As shown in Figures 1 and 2, a two-stage bolt tensioner according to an embodiment of the present invention includes a support 1, a pull rod 10 placed inside the support 1, and the support 1 Cylinder body one 2 fixedly installed, cylinder body two 11 fixedly installed with described cylinder body one 2 and cylinder head 6 fixedly installed with described cylinder body two 11, described cylinder body one 2 and described cylinder body two 11 Piston 1 3 and piston 2 12 are respectively sealed inside, and the piston 1 3 and piston 2 12 are in contact with each other; the center of the piston 2 12 is fitted with a nut 4, and the nut 4 is fixedly installed with the pull rod 10; A return spring 5 is fixedly arranged between the upper surface of the nut 4 and the cylinder head 6; the pull rod 10 passes through the piston one 3 and the piston two 12, and is mounted on the nut 4; the end of the pull rod 10 Bolt interface 13 is provided on the upper part; oil circuit assembly 7 is installed on the cylinder body one 2 and cylinder body two 11, and the oil circuit pipelines are respectively connected; the gear set 9 connected in series is fixedly arranged on the support, and the One end of the gear set is fixed on the support 1, and the other end is fixedly provided with a wrench shaft 8.

In one embodiment, the support 1 is fixedly connected to the cylinder body 1 through jacking screws.

In one embodiment, the centers of the first piston 3 and the second piston 12 are respectively provided with holes matched with the pull rod 10 .

In one embodiment, the upper end of the pull rod 10 is provided with an external thread that cooperates with the nut 4 .

In one embodiment, the first cylinder 2 is provided with external threads fixedly connected with the second cylinder 11 , and the second cylinder 11 is cooperatingly provided with internal threads.

In one embodiment, the cylinder body 2 11 is provided with external threads fixedly connected with the cylinder head 6 , and the cylinder head 6 is cooperatingly provided with internal threads.

In one embodiment, there is hydraulic oil between the inside of the first cylinder 2 and the first piston 3 , and between the second cylinder 11 and the second piston 12 .

In one embodiment, the outer surfaces of the first cylinder body 2 , the second cylinder body 11 and the cylinder head 6 are provided with anti-skid lines.

In order to facilitate the understanding of the above-mentioned technical solution of the present utility model, the above-mentioned technical solution of the present utility model will be described in detail below through specific usage modes.

In specific use, the two-stage bolt tensioner is seated on the bolt and nut to be locked (the internal gear 9 of the support 1 is matched with the lock nut hexagonally), so that it is screwed with the bolt interface 13 on the pull rod, Start the special pump for the tensioner. When pressurized, the hydraulic oil enters the first cylinder 2 and the second cylinder 11 through the oil circuit assembly 7, respectively pushes the first piston 3 and the second piston 12 to move upward, and pushes the nut 4 and the pull rod 10 Move upwards together, the movement distance is less than 10mm, and the bolts are tightened. Then the gear set is driven by the wrench shaft, and the locking nut is driven to rotate to achieve the locking of the bolt and the nut. After losing pressure, the return spring resets the nut 4, the first piston 3, the second piston 12 and the pull rod 10.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (8)

1. A two-stage bolt tensioner, characterized in that it includes a support (1), a tie rod (10) placed inside the support (1), and a cylinder fixed to the support (1) Body one (2), cylinder body two (11) fixedly installed with the cylinder body one (2) and cylinder head (6) fixedly installed with the cylinder body two (11), wherein: The first cylinder (2) and the second cylinder (11) are respectively sealed with piston one (3) and piston two (12), and the first piston (3) and the second piston (12) are in contact with each other; The center of the second piston (12) is fitted with a nut (4), and the nut (4) is fixedly installed with the pull rod (10); A return spring (5) is fixedly arranged between the upper surface of the nut (4) and the cylinder head (6); The pull rod (10) passes through the first piston (3) and the second piston (12), and is mounted on the nut (4); The end of the tie rod (10) is provided with a bolt interface (13); The first cylinder (2) and the second cylinder (11) are installed with an oil circuit assembly (7), and are respectively connected to the oil circuit; A series gear set (9) is fixedly arranged on the support, one end gear of the gear set is fixed on the support (1), and a wrench shaft (8) is fixedly arranged at the other end. 2. The two-stage bolt tensioner according to claim 1, characterized in that, the support (1) is fixedly connected to the cylinder body one (2) by a top screw. 3 . The two-stage bolt tensioner according to claim 1 , characterized in that, the centers of the first piston ( 3 ) and the second piston ( 12 ) are respectively provided with holes that cooperate with the pull rods ( 10 ). 4 . 4. The two-stage bolt tensioner according to claim 1, characterized in that, the upper end of the pull rod (10) is provided with an external thread that cooperates with the nut (4). 5. The two-stage bolt tensioner according to claim 4, characterized in that, the first cylinder (2) is provided with an external thread fixedly connected with the second cylinder (11), and the cylinder Two (11) are equipped with internal thread. 6. The two-stage bolt tensioner according to claim 5, characterized in that, the second cylinder (11) is provided with an external thread fixedly connected with the cylinder head (6), and the cylinder head ( 6) The upper fit is provided with internal threads. 7. The two-stage bolt tensioner according to claim 6, characterized in that, between the interior of the first cylinder (2) and the first piston (3), the interior of the second cylinder (11) and the There is hydraulic oil between the two pistons (12). 8. The two-stage bolt tensioner according to claim 7, characterized in that, the outer surfaces of the first cylinder (2), the second cylinder (11) and the cylinder head (6) are all set Has anti-slip texture.