CN204339259U - A kind of compact hydraulic pre-tightening device for tightening bolt - Google Patents

A kind of compact hydraulic pre-tightening device for tightening bolt Download PDF

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Publication number
CN204339259U
CN204339259U CN201420834143.8U CN201420834143U CN204339259U CN 204339259 U CN204339259 U CN 204339259U CN 201420834143 U CN201420834143 U CN 201420834143U CN 204339259 U CN204339259 U CN 204339259U
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CN
China
Prior art keywords
cylinder body
piston
thread bush
tightening
support set
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Active
Application number
CN201420834143.8U
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Chinese (zh)
Inventor
李文
王浩先
卓高柱
王志辉
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Jier Machine Tool Group Co Ltd
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Jier Machine Tool Group Co Ltd
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Priority to CN201420834143.8U priority Critical patent/CN204339259U/en
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Abstract

The utility model discloses a kind of compact hydraulic pre-tightening device for tightening bolt, the utility model comprises support set, piston, cylinder body and thread bush, thread bush is arranged on cylinder body, piston is arranged in the hydraulic cavities of cylinder body, the lower end of piston is fixed on support set, cylinder body is provided with the oil-in of hydraulic cavities, and the lower end of support set is provided with opening.Coordinate electrodynamic pump to suppress when the utility model uses, directly drive turnbuckle to move upward pulling by cylinder body, after meeting the requirements of pretightning force, under tightening nut, fill in corresponding pad, turnbuckle can be made to remain on Pre strained state accurately.This practicality is easy to operate, and pretightning force is easy to control.

Description

A kind of compact hydraulic pre-tightening device for tightening bolt
Technical field
The utility model relates to a kind of tools for bolts ' pretension device.
Background technology
In the pre-tightening apparatus of traditional forcing press turnbuckle, adopt screw rod pulling turnbuckle, such complex structure, heavy.And adopt rotating nut to make turnbuckle be in Pre strained state, the bad control of the nut anglec of rotation, it is indefinite whether turnbuckle is in Pre strained state, easily affects complete machine operating accuracy, even can cause mechanical accident time serious.
Utility model content
The technical problems to be solved in the utility model is: provide a kind of being easy to make turnbuckle remain on the compact hydraulic pre-tightening device for tightening bolt of Pre strained state accurately.
In order to solve the problems of the technologies described above, the utility model comprises support set, piston, cylinder body and thread bush, thread bush is arranged on cylinder body, piston is arranged in the hydraulic cavities of cylinder body, the lower end of piston is fixed on support set, cylinder body is provided with the oil-in of hydraulic cavities, and the lower end of support set is provided with opening.
For the ease of discharging the gas in hydraulic cavities, described cylinder body is provided with the air bleeding valve communicated with the hydraulic cavities of cylinder body, and air bleeding valve and oil-in are all arranged on the top of hydraulic cavities.
In order to operationally turnbuckle uniform force can be made, described cylinder body is body, hydraulic cavities is the annular housing be arranged in the annular wall of cylinder body, piston is the body matched with annular housing, support set, piston, cylinder body and thread bush axis are on same straight line, thread bush is arranged in the trepanning of cylinder body, and thread bush is threaded with cylinder body, and thread bush is provided with internal thread.
For the ease of controlling pretightning force more accurately, the outer surface of described piston is carved with scale.
Enter hydraulic cavities for the ease of piston, the piston inlet port of described hydraulic cavities is provided with chamfering.
The beneficial effects of the utility model are: coordinate electrodynamic pump to suppress when the utility model uses, turnbuckle is directly driven to move upward pulling by cylinder body, after meeting the requirements of pretightning force, under tightening nut, fill in corresponding pad, turnbuckle can be made to remain on Pre strained state accurately.This practicality is easy to operate, and pretightning force is easy to control.
Accompanying drawing explanation
Fig. 1 is complete section structural representation of the present utility model;
Fig. 2 is the X partial enlarged drawing of Fig. 1;
Fig. 3 is that figure is reduced in the structural representation that the utility model is connected with electrodynamic pump;
In figure: 1, cylinder body, 2, piston, 3, support set, 4, thread bush, 5, pad, 6, scale, 7, air bleeding valve, 8, hydraulic cavities, 9, oil-in, 10, oil pipe, 11, electrodynamic pump.
Detailed description of the invention
A kind of compact hydraulic pre-tightening device for tightening bolt as depicted in figs. 1 and 2, it comprises support set 3, piston 2, cylinder body 1 and thread bush 4, thread bush 4 is arranged on cylinder body 1, cylinder body 1 is body, be provided with the hydraulic cavities 8 of annular in the annular wall of cylinder body, the piston inlet port of hydraulic cavities 8 is provided with chamfering.Piston 2 is the body matched with hydraulic cavities 8, the outer surface of piston 2 is carved with scale 6, and piston 2 is arranged in hydraulic cavities 8.Support set 3, piston 2, cylinder body 1 and thread bush 4 four axis are on same straight line, and thread bush 4 is arranged in the trepanning of cylinder body 1, and thread bush 4 is threaded with cylinder body 1, and thread bush 4 is provided with internal thread, for being connected with the upper end of bolt.
Piston 2 is arranged in the hydraulic cavities 8 of cylinder body 1, and the lower end of piston 2 is fixed on support set 3, and cylinder body 1 is provided with the air bleeding valve 7 communicated with the hydraulic cavities 8 of cylinder body 1, and air bleeding valve 7 and oil-in 9 are all arranged on the top of hydraulic cavities 8.
Operation principle: as shown in figures 1 and 3, support set 3 lower end of this device is arranged on end face on pressure machine cross-beam, support set 3 covers nut, want the bolt of pretension to enter thread bush 4 and be threaded with thread bush 4, thread bush 4 and bolt axis are on the same line, the oil-in 9 of this device connects electrodynamic pump 11 by oil pipe 10, electrodynamic pump 11 squeezes into hydraulic oil in hydraulic cavities 8, along with pressure constantly raises, cylinder body 1 and thread bush 4 drive turnbuckle upper end to rise gradually, namely realize the pulling to turnbuckle.When the graduation mark that piston 2 presets exposes cylinder body 1 bottom surface, electrodynamic pump 11 can be stopped, stopping buying oil.Then on tightening nut and crossbeam, fill in pad 5 by the opening of support set 3 lower end between end face, now, turnbuckle pulling pretension terminates.

Claims (5)

1. a compact hydraulic pre-tightening device for tightening bolt, it is characterized in that: comprise support set, piston, cylinder body and thread bush, thread bush is arranged on cylinder body, piston is arranged in the hydraulic cavities of cylinder body, the lower end of piston is fixed on support set, cylinder body is provided with the oil-in of hydraulic cavities, and the lower end of support set is provided with opening.
2. compact hydraulic pre-tightening device for tightening bolt according to claim 1, is characterized in that: described cylinder body is provided with the air bleeding valve communicated with the hydraulic cavities of cylinder body, and air bleeding valve and oil-in are all arranged on the top of hydraulic cavities.
3. compact hydraulic pre-tightening device for tightening bolt according to claim 1 and 2, it is characterized in that: described cylinder body is body, hydraulic cavities is the annular housing be arranged in the annular wall of cylinder body, piston is the body matched with annular housing, support set, piston, cylinder body and thread bush axis are on same straight line, thread bush is arranged in the trepanning of cylinder body, and thread bush is threaded with cylinder body, and thread bush is provided with internal thread.
4. compact hydraulic pre-tightening device for tightening bolt according to claim 3, is characterized in that: the outer surface of described piston is carved with scale.
5. compact hydraulic pre-tightening device for tightening bolt according to claim 4, is characterized in that: the piston inlet port of described hydraulic cavities is provided with chamfering.
CN201420834143.8U 2014-12-25 2014-12-25 A kind of compact hydraulic pre-tightening device for tightening bolt Active CN204339259U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420834143.8U CN204339259U (en) 2014-12-25 2014-12-25 A kind of compact hydraulic pre-tightening device for tightening bolt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420834143.8U CN204339259U (en) 2014-12-25 2014-12-25 A kind of compact hydraulic pre-tightening device for tightening bolt

Publications (1)

Publication Number Publication Date
CN204339259U true CN204339259U (en) 2015-05-20

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ID=53222561

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420834143.8U Active CN204339259U (en) 2014-12-25 2014-12-25 A kind of compact hydraulic pre-tightening device for tightening bolt

Country Status (1)

Country Link
CN (1) CN204339259U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113441940A (en) * 2021-06-30 2021-09-28 哈尔滨工业大学 Piezoelectric transducer pre-tightening assembly device and method loaded along axial direction of bolt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113441940A (en) * 2021-06-30 2021-09-28 哈尔滨工业大学 Piezoelectric transducer pre-tightening assembly device and method loaded along axial direction of bolt

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