CN111408931B

CN111408931B - Hydraulic bolt stretcher

Info

Publication number: CN111408931B
Application number: CN202010278553.9A
Authority: CN
Inventors: 马爱明; 陈守荣; 戚凤梅; 王德志
Original assignee: Jangsu Minglu Stainless Steel Co ltd
Current assignee: Jiangsu Minglu Metal Resources Co.,Ltd.
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2021-09-21
Anticipated expiration: 2040-04-10
Also published as: CN111408931A

Abstract

The invention relates to the field of bolt tensioning tools, and discloses a hydraulic bolt tensioner, comprising a support ring, a bolt and a first nut, wherein the first nut is threadedly sleeved on the bolt, the first nut is threadedly sleeved, and the support ring The top of the cylinder is fixedly sleeved with an oil cylinder, a piston is movably sleeved in the cylinder, the top of the piston is fixedly connected to the top ring, and the top of the top ring extends out of the top of the cylinder, and the bottom of the side of the cylinder is fixedly sleeved with an oil cylinder, And the oil cylinder is connected with the annular oil cylinder. The hydraulic bolt tensioner, through the structural design of the six limit wedge blocks and the pull rod in the pull ring sleeve, utilizes the force transmission of the limit wedge blocks and the pull rod, so that the bolt can be stretched upward at the second nut. Therefore, the length of the stretched bolt is reduced, so that the proportion of the stretched portion of the bolt at the first nut is sufficiently large, the effective utilization rate of the stretched bolt is improved, and the work efficiency is improved.

Description

Hydraulic bolt stretcher

Technical Field

The invention relates to the field of bolt stretching tools, in particular to a hydraulic bolt stretcher.

Background

The bolt stretcher is a hydraulic source provided by means of a hydraulic booster pump, the stretching force is determined according to the tensile strength, yield coefficient and elongation of a material, the stretching force generated by an ultrahigh pressure oil pump is utilized, a bolt with a force applied is stretched in an elastic deformation area, the diameter of the bolt slightly deforms, so that a nut is easy to loosen or tighten, no torsional shear force and lateral force exist, no friction damage exists on a connected contact surface, and the bolt stretcher is widely applied to the fields of petrochemical industry, nuclear power, wind power, hydropower, thermal power, ships, railways, aerospace, mining, heavy machinery and the like

However, when the existing bolt stretcher is used, the ring pulling thread sleeve is positioned at the head of the bolt for stretching, when the length of the part of the bolt extending out of the nut is long, the length of the stretched bolt is large, the proportion of the part occupied by the nut is not large enough, so that many parts of the stretched bolt are not utilized, the stretching efficiency of the bolt is low, and the whole stretching working efficiency of the bolt is influenced.

Disclosure of Invention

Aiming at the defects of the background technology, the invention provides a hydraulic bolt stretcher which has the advantage of high utilization rate of a stretched bolt and solves the problems in the background technology.

The invention provides the following technical scheme: a hydraulic bolt stretcher comprises a support ring, a bolt and a first nut, wherein the first nut is sleeved on the bolt in a threaded manner, the first nut is sleeved in a threaded manner, an oil cylinder is fixedly sleeved on the top of the support ring, a piston is movably sleeved in the oil cylinder, the top of the piston is fixedly connected with a top ring, the top of the top ring extends out of the top end of the oil cylinder, the bottom of the side surface of the oil cylinder is fixedly sleeved with the oil cylinder, and the oil cylinder is communicated with an annular oil cylinder; the inner ring of the oil cylinder is movably sleeved with a pull ring sleeve, the outer edge of the top of the pull ring sleeve is in contact with the top of the top ring, the bottom of the inner ring of the pull ring sleeve is provided with six limiting wedge blocks which are symmetrically distributed, a pull rod is correspondingly arranged on the inclined plane of each limiting wedge block, the bottom of the inner side of each pull rod is provided with a right-angled bulge, a second nut is clamped between the six pull rods and completely identical to the first nut, the bottom of the second nut is in contact with the right-angled bulge on the side face of each pull rod, and the other side of each pull rod is completely attached to the inclined plane of the corresponding limiting wedge block; a half-circle through groove is formed in the bottom of the support ring, a tightening ring clamped on the first nut is arranged in the support ring, and a notch is formed in the outer ring of the tightening ring.

Preferably, the middle part of the inclined plane of the limiting wedge-shaped block is provided with a sliding groove, the side surface of the pulling rod is provided with a sliding block matched with the sliding groove, and the sliding block is movably sleeved with the sliding groove.

Preferably, the dead man and slider, spacing wedge and the ring cover of pulling out are the integral type design, and the inclined plane of dead man is close to the right angle arch of its bottom, the dead man and slider, spacing wedge and the ring cover of pulling out carry out whole production through the mould.

Preferably, the contact inclined plane of spacing wedge and dead lever is the arc inclined plane, and the height value of dead lever is three times of its biggest second nut of internal ruler footpath.

The invention has the following beneficial effects:

this hydraulic pressure bolt stretcher, structural design through six spacing wedge blocks in the pull-out ring cover and dead lever, utilize spacing wedge block, the biography power of dead lever, be convenient for upwards stretch the bolt in second nut department, thereby the length by tensile bolt has been reduced, make the tensile partial proportion of occuping of first nut department bolt enough big, the effective utilization ratio of by tensile bolt improves, and then work efficiency has been improved, and simultaneously, stretch the bolt through the second nut to with bolt looks adaptation, the quantity of second nut is sufficient and easy, need not to make supporting nut cover to the bolt of not unidimensional, the convenience of use of bolt stretcher has been improved, and need not to change because of the damage pertinence of nut cover, the later stage cost has been saved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the lever of the structure of FIG. 1 according to the present invention;

FIG. 3 is a bottom view of the pull ring sleeve of the structure of FIG. 1 in accordance with the present invention;

FIG. 4 is a top view of the pull ring sleeve of the structure of FIG. 1 of the present invention.

In the figure: 1. a support ring; 2. an oil cylinder; 3. a piston; 4. a top ring; 5. an oil delivery pipe; 6. pulling out the ring sleeve; 7. a limiting wedge block; 701. a chute; 8. pulling a rod; 801. a slider; 9. a bolt; 10. a first nut; 11. a second nut; 12. and (5) tightening the ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a hydraulic bolt stretcher includes a supporting ring 1, a bolt 9, a first nut 10, the first nut 10 is screwed on the bolt 9, an oil cylinder 2 is fixedly sleeved on the top of the supporting ring 1, a piston 3 is movably sleeved in the oil cylinder 2, the top of the piston 3 is fixedly connected with a top ring 4, the top of the top ring 4 extends out of the top end of the oil cylinder 2, the oil cylinder 2 is fixedly sleeved on the bottom of the side surface of the oil cylinder 2, the oil cylinder 2 is communicated with the annular oil cylinder, a pull ring sleeve 6 is movably sleeved on the inner ring of the oil cylinder 2, the outer edge of the top of the pull ring sleeve 6 contacts with the top of the top ring 4, six symmetrically distributed limiting wedge blocks 7 are arranged at the bottom of the inner ring of the pull ring sleeve 6, a pull rod 8 is correspondingly arranged on the inclined plane of each limiting wedge block 7, a right-angle protrusion is arranged at the bottom of the inner side of the pull rod 8, a second nut 11 is clamped between the six pull rods 8, namely, the inner sides of six pulling rods 8 are respectively contacted and jointed with six surfaces of a second nut 11, the bottom of the second nut 11 is contacted with a right-angled bulge on the side surface of the pulling rod 8, the other side of the pulling rod 8 is completely jointed with the inclined surface of a limiting wedge block 7, the pulling rod 8 slides up and down on the inclined surface of the limiting wedge block 7, the distance between the six pulling rods 8 is controlled by moving the six pulling rods 8 up and down on the inclined surface of the limiting wedge block 7, so that the second nuts 11 with different sizes in a certain range are clamped and jointed, the range is determined by the length value of the inclined surface of the limiting wedge block 7, the pulling ring sleeve 6 is rotated to drive the second nut 11 to rotate on a bolt 9, the second nut 11 is rotated to be close to a first nut 10, so that hydraulic oil is injected into the oil conveying pipe 5 through hydraulic equipment, the top ring 4 props the pulling ring sleeve 6 to move upwards, the six limiting wedge blocks 7 on the inner ring of the pulling ring 6 act on the inclined surface of the pulling rod 8, the six pulling rods 8 drive the second nuts 11 to move upwards, the bolts 9 are upwards stretched at the second nuts 11 under the action of the threads between the second nuts 11 and the bolts 9, so that the length of the stretched bolts 9 is reduced, the proportion of the stretched parts of the bolts 9 at the first nuts 10 is large enough, the effective utilization rate of the stretched screws is improved, and further the working efficiency is improved, meanwhile, the bolts 9 are completely the same as the first nuts 10 by stretching the second nuts 11 matched with the bolts 9, the number of the second nuts 11 and the number of the first nuts 10 are sufficient, matched nut sleeves do not need to be manufactured for the bolts 9 with different sizes, the use convenience of the bolt stretcher is improved, targeted replacement caused by damage of the nut sleeves is not needed, the later cost is saved, and the upward acting force of the pulling ring sleeve 6 and the limiting wedge block 7 is utilized, make every spacing wedge 7 to the direct effort direction of dead lever 8 for tilt up, spacing wedge 7 provides dead lever 8 to second nut 11 to the ascending component force of dead lever 8, the upwards tensile force of bolt 9, and spacing wedge 7 provides the horizontal pressure of dead lever 8 to second nut 11 when tensile to the horizontal component force of dead lever 8, thereby ensure that second nut 11 is stable when stretching bolt 9 shifts up, half a circle logical groove has been seted up to support ring 1 bottom, and be equipped with the tightring 12 of card on first nut 10 in the support ring 1, the notch has been seted up to the outer lane of tightring 12, insert the notch through special spanner, rotate tightring 12 and drive first nut 10 rotatory, tighten or loosen.

Wherein, spout 701 has been seted up at the middle part on 7 inclined planes of spacing wedge, the side of dead lever 8 is equipped with the slider 801 with spout 701 looks adaptation, and slider 801 cup joints with the activity of spout 701, spout 701 through on 7 spacing wedge carries on spacingly to slider 801, make dead lever 8 only can reciprocate relatively the inclined plane of spacing wedge 7, thereby be at rotatory spacing wedge 7, dead lever 8 is rotatory along with it, utilize six dead levers 8 to act on six sides of second nut 11, thereby be convenient for drive second nut 11 and rotate on bolt 9

The pulling rod 8, the sliding block 801, the limiting wedge-shaped block 7 and the pulling ring sleeve 6 are designed in an integrated mode, the inclined surface of the pulling rod 8 is close to a right-angle protrusion at the bottom of the pulling rod, the pulling rod 8, the sliding block 801, the limiting wedge-shaped block 7 and the pulling ring sleeve 6 are integrally produced through a die, and the pulling rod 8, the sliding block 801, the limiting wedge-shaped block 7 and the pulling ring sleeve 6 are integrally designed, so that the bearing capacity of the pulling rod 8, the sliding block 801, the limiting wedge-shaped block 7 and the pulling ring sleeve 6 is improved, and.

Wherein, the contact inclined plane of spacing wedge 7 and dead lever 8 is the arc inclined plane, it is further spacing to carry out the dead lever 8 of 7 inclined planes departments of spacing wedge, when guaranteeing that dead lever 8 reciprocates in the inclined plane department of spacing wedge 7, rotate along with the rotation of spacing wedge 7, the height value of dead lever 8 is three times of the height value of its interior biggest second nut 11 of footpath, when the height value of second nut 11 is less, through the quantity that increases second nut 11, thereby ensure the bolt elongator when using, dead lever 8 and second nut 11 homoenergetic are in the stable trend that shifts up, thereby carry out stretching work to bolt 9.

When the device is used, the support ring 1 and the oil cylinder 2 are fixed to a bolt 9 to be stretched, a second nut 11 which is matched with the bolt 9, namely completely same as the first nut 10 is placed between six pull rods 8 in the pull ring sleeve 6, six faces of the second nut 11 are attached to the side faces of the six pull rods 8, then the pull ring sleeve 6 is rotated above the bolt 9, the second nut 11 is rotated on the bolt 9 until the second nut 11 rotates to a position close to the first nut 10, then hydraulic equipment is connected to the oil pipeline 5, hydraulic oil is injected into the annular oil cylinder in the oil cylinder 2 through the hydraulic equipment, so that the piston 3 drives the top ring 4 to move upwards, the top ring 4 props against the pull ring sleeve 6 to move upwards integrally, the limiting wedge 7 in the pull ring sleeve 6 drives the pull rods 8 and the second nut 11 to move upwards integrally, the second nut 11 drives the bolt 9 to stretch, and then, thereby in the notch of support ring 1 bottom, utilize the spanner to rotate second nut 11 and drive first nut 10 rotatory, screw up or loosen first nut 10, can.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A hydraulic bolt tensioner, comprising a support ring (1), a bolt (9), a first nut (10), and the first nut (10) is threadedly sleeved on the bolt (9), characterized in that: An oil cylinder (2) is fixedly sleeved on the top of the support ring (1), a piston (3) is movably sleeved in the oil cylinder (2), and the top of the piston (3) is fixedly connected to the top ring (4), and the top ring The top of (4) extends out of the top of the oil cylinder (2), the bottom of the side of the oil cylinder (2) is fixedly sleeved with an annular oil cylinder, and the oil cylinder (2) is connected to the annular oil cylinder; the inner part of the oil cylinder (2) The ring movable sleeve is provided with a pulling ring sleeve (6), and the outer edge of the top of the pulling ring sleeve (6) is in contact with the top of the top ring (4). The bottom of the inner ring of the pulling ring sleeve (6) is provided with six symmetrically distributed The limit wedge block (7), the slope of each limit wedge block (7) is correspondingly provided with a pull rod (8), the bottom of the inside of the pull rod (8) is provided with a right-angle protrusion, and the six A second nut (11) is clamped between the pulling rods (8), the second nut (11) is exactly the same as the first nut (10), and the bottom of the second nut (11) and the side surface of the pulling rod (8) The right-angled protrusions of the pull rod (8) are in contact with each other, and the other side of the pull rod (8) is completely fitted with the inclined surface of the limiting wedge block (7). A tightening ring (12) clamped on the first nut (10) is provided inside, and a notch is provided on the outer ring of the tightening ring (12).

2. A hydraulic bolt tensioner according to claim 1, characterized in that: a chute (701) is provided in the middle of the inclined surface of the limiting wedge block (7), and a side surface of the pulling rod (8) is provided with a chute (701). A sliding block (801) matched with the sliding groove (701) is provided, and the sliding block (801) is movably sleeved with the sliding groove (701).

3 . The hydraulic bolt tensioner according to claim 2 , wherein the pull rod ( 8 ) and the slider ( 801 ), the limit wedge block ( 7 ) and the pull ring sleeve ( 6 ) are the same as 3 . One-piece design, and the inclined surface of the pulling rod (8) is close to the right-angled protrusion at the bottom, and the pulling rod (8) passes through the slider (801), the limiting wedge block (7) and the pulling ring sleeve (6) The mold is produced as a whole.

4. A hydraulic bolt tensioner according to claim 1, characterized in that: the contact slope between the limit wedge block (7) and the pull rod (8) is an arc slope, and the pull rod (8) The height value is three times the inner diameter of the second nut (11).