CN105414948A - Bolt-tensioning-pretightened device and assembly formed by bolt-tensioning-pretightened device - Google Patents
Bolt-tensioning-pretightened device and assembly formed by bolt-tensioning-pretightened device Download PDFInfo
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- CN105414948A CN105414948A CN201610037573.0A CN201610037573A CN105414948A CN 105414948 A CN105414948 A CN 105414948A CN 201610037573 A CN201610037573 A CN 201610037573A CN 105414948 A CN105414948 A CN 105414948A
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- worm gear
- bolt
- worm
- pull bar
- tightening apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/06—Screw or nut setting or loosening machines
- B23P19/067—Bolt tensioners
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- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
Abstract
The invention discloses a bolt-tensioning-pretightened device and an assembly formed by the bolt-tensioning-pretightened device. The bolt-tensioning-pretightened device comprises a supporting seat and a top plate, wherein hydraulic cylinders are arranged between the supporting seat and the top plate, the bottoms of the hydraulic cylinders are fixedly arranged on the supporting seat, the end parts of ejection ends of the hydraulic cylinders are fixedly arranged on the top plate, and the hydraulic cylinders drive the top plate to be far away from or close to the supporting seat; a tension rod which is vertical to the surface of the supporting seat is arranged on the supporting seat, a through hole is formed in the top plate so as to enable the tension rod to pass through, a groove is formed in one end, far away from the supporting seat, of the tension rod, the groove and the tension rod are coaxial, and internal threads which are matched with external threads of a bolt to be tensioned are formed in the sidewall of the groove; a first rotation driving device which is used for driving the tension rod to rotate forwardly or reversely is arranged on the supporting seat, and a second rotation driving device which is used for driving a nut to rotate is arranged at a groove opening of the groove. According to the bolt-tensioning-pretightened device and the assembly formed by the bolt-tensioning-pretightened device, disclosed by the invention, the work efficiency is high, and the condition that the nut is damaged due to excessive wear during nut tightening can be prevented; the pretightening force for a ring flange is relatively balanced, so that the condition that a local pretightening force is too excessive or too inadequate can be avoided.
Description
Technical field
The present invention relates to bolted, dismantling technology field, the assembly particularly relating to a kind of bolt tension pre-tightening apparatus and be made up of this device.
Background technology
Traditional bolted scheme is mainly tightened by artificial spanner or electric wrench, the threaded pre-tightening when pretightning force of this operation scheme is mainly rotated by nut and bolt circumference, nut circumference under the effect of spanner is rotated, the external screw thread of bolt is driven by its internal thread, and then forcing bolt to be stretched in the axial direction (bolt is stretched vertically or has the trend be stretched), the bolt after being stretched circumferentially shrinks and then reaches fastening object.In the process of tightening, screw thread needs to bear larger frictional force, and then causes the excessive abrasion of screw thread, particularly often needs this damaged condition of bolt repeatedly dismantled with regard to larger for some, often needs periodic replacement nut or screw rod.
Damaged screw in bolted process, technical staff develops the fastening method of main shaft (bolt) stretching swelling, also namely existing by bolt tension predetermined length, then nut driving is put in place, then bolt is discharged, shunk vertically by bolt and reach fastening effect, this fastening method avoids nut makes bolt be stretched by screwing of screw thread, and then it is bad effectively to prevent screw thread to be worn.As Chinese patent literature CN101898299A discloses a kind of synchronous screwing device for connecting main, although they can simultaneously by 14 bolt tension, but it can only go up jack panel with spanner one by one to when bolted, operating efficiency is lower, and adopt spanner to tighten one by one, the degree varies of tightening of each nut certainly will be caused to cause, the pretightning force of each bolt is directly caused to vary in size after release bolt, for ring flange, because the pretightning force of each bolt of its axis is inconsistent, easily cause docking card discontinuity equalization, and then damage bolt, nut or sealing ring etc.
Summary of the invention
For this reason, the technical problem to be solved in the present invention overcomes existing bolt clamp device above shortcomings, so provide that a kind of operating efficiency is high, convenient operation and the bolt tension pre-tightening apparatus of pretightning force equilibrium and the assembly that is made up of this device.
For achieving the above object, the present invention is by the following technical solutions:
A kind of bolt tension pre-tightening apparatus, it comprises bearing and top board, oil cylinder is provided with between described bearing and described top board, the bottom of described oil cylinder is fixed on described bearing, the end winding support ejecting end of described oil cylinder on described top board, top board described in described hydraulic oil cylinder driving away from or near described bearing; Described bearing is provided with the pull bar perpendicular to described abutment surface, described top board is provided with through hole to pass for described pull bar, one end away from described bearing of described pull bar is provided with groove, described groove is coaxial with described pull bar, the sidewall of described groove is provided with the internal thread coordinated with the external screw thread of bolt to be tensioned; Described bearing is provided with and drives described pull bar to rotate described groove screwed in or screw out the first drive rotating device of described bolt to be tensioned forward or backwards, the notch place of described groove is provided with and drives described bolt top nut to be tensioned to rotate with by second drive rotating device of described nut driving to precalculated position.
Preferably, described first drive rotating device comprises the first worm gear being fixed on described tie rod end, described first worm gear and described pull bar are coaxially arranged, the diameter of described first worm gear is greater than the diameter of described pull bar, the axle center place of described bearing is provided with the T-shaped through hole passed for described pull bar, described pull bar passes from described T-shaped through hole, and the end face of described first worm gear is against on the step of described T-shaped through hole, and the side of described first worm gear is provided with the first worm screw driving described first worm gear wheel.
Preferably, the worm-gear toothing of described first worm gear is concave inward structure, and the minimum point of the worm-gear toothing indent of described first worm gear is positioned at the center of described first worm gear thickness direction.
Preferably, the side relative with described first worm screw of described first worm gear is provided with the first support round pin, described first support round pin and described first worm screw be arranged in parallel, described first body supporting round pin embeds in the die cavity of the concave inward structure of described first worm gear, and described first support round pin and described first worm screw are from the first worm gear described in the common support of both sides.
Preferably, the plane bearing for supporting described first worm gear is provided with between the end face of described first worm gear and the step surface of described T-shaped through hole.
Preferably, described first worm gear and described pull bar are integral type structure; Described oil cylinder is provided with two, is symmetrical arranged centered by described pull bar.
Preferably, described second drive rotating device comprises the second worm gear away from described bearing side being arranged on described top board, and the second worm screw driving described second worm gear to rotate forward or backwards, the center of described second worm gear is provided with the interior hexagonal hole being suitable for being enclosed within described nut.
Preferably, the worm-gear toothing of described second worm gear is along the setting that concaves in week of side, the side relative with described second worm screw of described second worm gear be provided with for support second state second of worm gear and support round pin, embed in the worm-gear toothing die cavity of described second worm gear in the middle part of the described second shaft supporting round pin.
A kind of bolt tension pretension assembly, comprise chassis, one side end face on described chassis is provided with several bolt tension pre-tightening apparatus, bolt tension pre-tightening apparatus described in several circumferentially uniform intervals is arranged, described bolt tension pre-tightening apparatus is the arbitrary described bolt tension pre-tightening apparatus of claim 1-8.
Preferably, oil cylinder, the first drive rotating device, the second drive rotating device Synchronization Control respectively of bolt tension pre-tightening apparatus described in several.
Beneficial effect of the present invention:
Bolt tension pre-tightening apparatus of the present invention and bolt tension pretension assembly are in bolted process, the stretching of its bolt and the pretension of nut drive by corresponding drive unit and automatically carry out, and nut only need be screwed to precalculated position in the process of pretension, without the need to the larger power that rotates in a circumferential direction, and do not have between the internal thread of nut and the external screw thread of bolt larger friction occurs, the axial shrinkage of what object fastening was leaned on is bolt, therefore the bolt tension pre-tightening apparatus operating efficiency of the application is higher, more effectively can prevent thread abrasion, and pretension dynamics is convenient to control, simple to operate.
In addition, bolt tension pretension assembly of the present invention is convenient to the articles of flange plate type each bolt circumferentially to stretch identical amount simultaneously, bolt is discharged after pre-load nut, bolt shrinks vertically under the effect of restoring force, the contraction dynamics of each bolt is equal, ensure that the pretightning force of each bolt of circumference is all equal, and then ensure that the pretension stability of fastened object (object of flange plate type), local pretightning force can be avoided excessive or too small.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein:
Fig. 1 is the structural representation of bolt tension pre-tightening apparatus of the present invention;
Fig. 2 is the structural representation of bolt tension pretension assembly of the present invention.
In figure, Reference numeral is expressed as:
1-bearing; 2-top board; 3-oil cylinder; 4-pull bar; 5-through hole; 6-groove; 71-first worm gear; 72-T shape through hole; 73-first worm screw; 74-first supports round pin; 81-second worm gear; 82-second worm screw; 83-second supports round pin; 9-chassis; 10-bolt tension pre-tightening apparatus.
Detailed description of the invention
Embodiment one
See Fig. 1, a kind of bolt tension pre-tightening apparatus, it comprises bearing 1 and top board 2, oil cylinder 3 is provided with between described bearing 1 and top board 2, the bottom of described oil cylinder 3 is fixed on described bearing 1, the end winding support ejecting end of described oil cylinder 3 on described top board 2, described oil cylinder 3 drive described top board 2 away from or near described bearing 1; Described bearing 1 is provided with the pull bar 4 perpendicular to described bearing 1 surface, described top board 2 is provided with through hole 5 to pass for described pull bar 4, one end away from described bearing 1 of described pull bar 4 is provided with groove 6, described groove 6 is coaxial with described pull bar 4, the inner chamber of described groove 6 is cylindrical structural, its sidewall is provided with the internal thread coordinated with the external screw thread of bolt to be tensioned; Described bearing 1 is provided with and drives described pull bar 4 to rotate the first drive rotating device described groove 6 is screwed in or to be screwed out described bolt to be tensioned forward or backwards, the notch place of described groove 6 is provided with and drives described bolt top nut to be tensioned to rotate with the second drive rotating device described nut being screwed to precalculated position.The pull bar of this bolt tension pre-tightening apparatus is driven by the first drive rotating device, the end of bolt to be tensioned can be screwed in voluntarily, then by injecting fluid in oil cylinder, the piston of oil cylinder is ejected, and then make top board to the lateral movement away from bearing, be against on the object to be tightened such as ring flange due to top board away from bearing side, now bolt is stretched vertically, when bolt is stretched to predetermined length, rotated by the second drive rotating device drive nut, the inboard end face of nut is made to against the surface of fastened object, then to oil cylinder pressure release, bolt shrinks vertically under the effect of restoring force, screw in advance nut on bolt to be tensioned then because of the axial shrinkage of bolt just fastened object tighten.Visible, in this fastener cycle, the stretching of bolt and the pretension of nut drive by corresponding drive unit and automatically carry out, and nut only need be screwed to precalculated position in the process of pretension, without the need to the larger power that rotates in a circumferential direction, and do not have between the internal thread of nut and the external screw thread of bolt larger friction occurs, the axial shrinkage of what object fastening was leaned on is bolt, therefore the bolt tension pre-tightening apparatus operating efficiency of the application is higher, more effectively can prevent thread abrasion, and pretension dynamics is convenient to control.
As long as described first drive rotating device can drive the forward and reverse rotation of pull bar to screw in or to screw out the end of bolt, concrete form is not limit.And specific to the present embodiment, described first drive rotating device then comprises the first worm gear 71 being fixed on described pull bar 4 end, described first worm gear 71 is coaxially arranged with described pull bar 4, the diameter of described first worm gear 71 is greater than the diameter of described pull bar 4, the axle center place of described bearing 1 is provided with the T-shaped through hole 72 passed for described pull bar 4, described pull bar 4 passes from described T-shaped through hole 72, the end face of described first worm gear 71 is against on the step of described T-shaped through hole 72, and the side of described first worm gear 71 is provided with the first worm screw 73 driving described first worm gear 71 to rotate.The drive mechanism of worm and gear is adopted to control forward and reverse rotation of pull bar, accuracy and the promptness of transmission process can be ensured on the one hand, the opposing party is then because worm gear is mutually vertical with the center of rotation of worm screw, and then be convenient to arrange transmission mechanism on this stretching pre-tightening apparatus, described worm screw can have the power source transmissions such as servomotor.
In the present embodiment, the worm-gear toothing of described first worm gear 71 is concave inward structure, the minimum point of the worm-gear toothing indent of described first worm gear 71 is positioned at the center of described first worm gear 71 thickness direction, see Fig. 1, also namely from the side of the first turbine 71, the turbo tooth of the first turbine 71 is formed with semicircular groove ring, and this semicircular groove ring is positioned at the center of the first worm gear 71 thickness direction just, and this setup can ensure the transmission stability of turbine and worm.
In the present embodiment, for the ease of installing and ensureing the stability that the first worm gear 71 works, the side relative with described first worm screw 73 of described first worm gear 71 is provided with the first support round pin 74, described first supports round pin 74 be arranged in parallel with described first worm screw 71, described first body supporting round pin 74 embeds in the die cavity of the concave inward structure of described first worm gear 71, see Fig. 1, described first supports round pin 74 with described first worm screw 73 from the first worm gear 71 described in the common support of both sides.
In the present embodiment, in order to avoid when oil cylinder 3 ejects, because the end face of the first turbine 71 and the step surface of T-shaped through hole 72 are excessively conflicted, (conflict power is larger, rub thereupon increasing) and hinder the rotation of pull bar 4, be provided with the plane bearing (not shown) for supporting described first worm gear 71 between the end face of described first worm gear 71 and the step surface of described T-shaped through hole.
In the present embodiment, described first worm gear 71 is integral type structure with described pull bar 4; Described oil cylinder 3 is provided with two, is symmetrical arranged centered by described pull bar, and this setup is convenient to oil cylinder pull bar both sides when jack-up and is had identical driving force.Certainly, three oil cylinders (or other quantity) also can be set, to ensure stability when pull bar pulls bolt further.
In the present embodiment, described second drive rotating device comprises the second worm gear 81 away from described bearing 1 side being arranged on described top board 2, and the second worm screw 82 driving described second worm gear 81 to rotate forward or backwards, the center of described second worm gear 81 is provided with the interior hexagonal hole being suitable for being enclosed within described nut.The worm-gear toothing of described second worm gear 81 is along the setting that concaves in week of side, the side relative with described second worm screw 82 of described second worm gear 81 be provided with for support second state second of worm gear 81 and support round pin 83, embed in the worm-gear toothing die cavity of described second worm gear 81 in the middle part of the shaft of described second support round pin 83, described second support round pin 83 and the second worm screw 82 from both sides common support second worm gear 81, and then ensure the job stability of the second worm gear 81.
Embodiment two
See Fig. 2, a kind of bolt tension pretension assembly, it comprises chassis 9, one side end face on described chassis 9 is provided with several bolt tension pre-tightening apparatus 10, bolt tension pre-tightening apparatus 10 described in several circumferentially uniform intervals is arranged, described bolt tension pre-tightening apparatus 10 is the bolt tension pre-tightening apparatus described in above-described embodiment one, the oil cylinder of bolt tension pre-tightening apparatus 10 described in several, first drive rotating device, second drive rotating device is Synchronization Control respectively, and then be convenient to the articles of flange plate type each bolt circumferentially to stretch identical amount simultaneously, bolt is discharged after pre-load nut, bolt shrinks vertically under the effect of restoring force, the contraction dynamics homogeneous phase etc. of each bolt, and then ensure that the pretightning force of each bolt of circumference is all equal, and then ensure that the pretension of fastened object (object of flange plate type) is stablized.The quantity of the bolt tension pre-tightening apparatus on this bolt tension pretension assembly sets as required.
Above-mentioned detailed description of the invention is just explained in detail technical scheme of the present invention; the present invention has more than and is only confined to above-described embodiment; those skilled in the art should be understood that; every improvement on basis of the present invention according to above-mentioned principle and spirit, substitute, all should within protection scope of the present invention.
Claims (10)
1. a bolt tension pre-tightening apparatus, it is characterized in that: comprise bearing and top board, oil cylinder is provided with between described bearing and described top board, the bottom of described oil cylinder is fixed on described bearing, the end winding support ejecting end of described oil cylinder on described top board, top board described in described hydraulic oil cylinder driving away from or near described bearing; Described bearing is provided with the pull bar perpendicular to described abutment surface, described top board is provided with through hole to pass for described pull bar, one end away from described bearing of described pull bar is provided with groove, described groove is coaxial with described pull bar, the sidewall of described groove is provided with the internal thread coordinated with the external screw thread of bolt to be tensioned; Described bearing is provided with and drives described pull bar to rotate described groove screwed in or screw out the first drive rotating device of described bolt to be tensioned forward or backwards, the notch place of described groove is provided with and drives described bolt top nut to be tensioned to rotate with by second drive rotating device of described nut driving to precalculated position.
2. bolt tension pre-tightening apparatus according to claim 1, it is characterized in that: described first drive rotating device comprises the first worm gear being fixed on described tie rod end, described first worm gear and described pull bar are coaxially arranged, the diameter of described first worm gear is greater than the diameter of described pull bar, the axle center place of described bearing is provided with the T-shaped through hole passed for described pull bar, described pull bar passes from described T-shaped through hole, the end face of described first worm gear is against on the step of described T-shaped through hole, and the side of described first worm gear is provided with the first worm screw driving described first worm gear wheel.
3. bolt tension pre-tightening apparatus according to claim 2, is characterized in that: the worm-gear toothing of described first worm gear is concave inward structure, and the minimum point of the worm-gear toothing indent of described first worm gear is positioned at the center of described first worm gear thickness direction.
4. the bolt tension pre-tightening apparatus according to Claims 2 or 3, it is characterized in that: the side relative with described first worm screw of described first worm gear is provided with the first support round pin, described first support round pin and described first worm screw be arranged in parallel, described first body supporting round pin embeds in the die cavity of the concave inward structure of described first worm gear, and described first support round pin and described first worm screw are from the first worm gear described in the common support of both sides.
5. the bolt tension pre-tightening apparatus according to claim 3 or 4, is characterized in that: be provided with the plane bearing for supporting described first worm gear between the end face of described first worm gear and the step surface of described T-shaped through hole.
6., according to the arbitrary described bolt tension pre-tightening apparatus of claim 2-5, it is characterized in that: described first worm gear and described pull bar are integral type structure; Described oil cylinder is provided with two, is symmetrical arranged centered by described pull bar.
7. according to the arbitrary described bolt tension pre-tightening apparatus of claim 1-6, it is characterized in that: described second drive rotating device comprises the second worm gear away from described bearing side being arranged on described top board, and the second worm screw driving described second worm gear to rotate forward or backwards, the center of described second worm gear is provided with the interior hexagonal hole being suitable for being enclosed within described nut.
8. bolt tension pre-tightening apparatus according to claim 7, it is characterized in that: the worm-gear toothing of described second worm gear is along the setting that concaves in week of side, the side relative with described second worm screw of described second worm gear be provided with for support second state second of worm gear and support round pin, embed in the worm-gear toothing die cavity of described second worm gear in the middle part of the described second shaft supporting round pin.
9. a bolt tension pretension assembly, it is characterized in that: comprise chassis, one side end face on described chassis is provided with several bolt tension pre-tightening apparatus, bolt tension pre-tightening apparatus described in several circumferentially uniform intervals is arranged, described bolt tension pre-tightening apparatus is the arbitrary described bolt tension pre-tightening apparatus of claim 1-8.
10. bolt tension pretension assembly according to claim 9, is characterized in that: the oil cylinder of bolt tension pre-tightening apparatus described in several, the first drive rotating device, the second drive rotating device Synchronization Control respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610037573.0A CN105414948A (en) | 2016-01-19 | 2016-01-19 | Bolt-tensioning-pretightened device and assembly formed by bolt-tensioning-pretightened device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610037573.0A CN105414948A (en) | 2016-01-19 | 2016-01-19 | Bolt-tensioning-pretightened device and assembly formed by bolt-tensioning-pretightened device |
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| CN105414948A true CN105414948A (en) | 2016-03-23 |
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| CN201610037573.0A Pending CN105414948A (en) | 2016-01-19 | 2016-01-19 | Bolt-tensioning-pretightened device and assembly formed by bolt-tensioning-pretightened device |
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| CN (1) | CN105414948A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333042A (en) * | 2017-12-07 | 2018-07-27 | 上海航天精密机械研究所 | A kind of spiral big stroke tensile loading device |
| CN110211714A (en) * | 2019-06-21 | 2019-09-06 | 三门核电有限公司 | A kind of reactor pressure vessel kingbolt tensile loads technique |
| CN113635038A (en) * | 2021-09-01 | 2021-11-12 | 中国船舶重工集团海装风电股份有限公司 | Synchronous pressing device for expansion sleeve and installation method of expansion sleeve |
| CN116117497A (en) * | 2023-01-10 | 2023-05-16 | 中国神华煤制油化工有限公司 | Mounting and dismounting device for bolts |
| US12017332B2 (en) | 2020-03-25 | 2024-06-25 | Milwaukee Electric Tool Corporation | Bolt tensioning tool |
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| CN103252641A (en) * | 2013-05-30 | 2013-08-21 | 太原重工股份有限公司 | Hydraulic pre-tightening tool |
| CN104029007A (en) * | 2014-06-13 | 2014-09-10 | 中科华核电技术研究院有限公司 | Entire bolt stretcher for nuclear reactor pressure vessels and operating process thereof |
| CN205309743U (en) * | 2016-01-19 | 2016-06-15 | 喻明 | Tensile preloading device of bolt and subassembly of constituteing by device |
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| EP0365157A1 (en) * | 1988-10-06 | 1990-04-25 | Hedley Purvis Limited | Hydraulic bolt tensioner |
| CN101649929A (en) * | 2009-07-07 | 2010-02-17 | 哈尔滨工程大学 | Deep sea flange connecting bolt library screwing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333042A (en) * | 2017-12-07 | 2018-07-27 | 上海航天精密机械研究所 | A kind of spiral big stroke tensile loading device |
| CN110211714A (en) * | 2019-06-21 | 2019-09-06 | 三门核电有限公司 | A kind of reactor pressure vessel kingbolt tensile loads technique |
| CN110211714B (en) * | 2019-06-21 | 2020-08-07 | 三门核电有限公司 | Reactor pressure vessel main bolt tension loading process |
| US12017332B2 (en) | 2020-03-25 | 2024-06-25 | Milwaukee Electric Tool Corporation | Bolt tensioning tool |
| CN113635038A (en) * | 2021-09-01 | 2021-11-12 | 中国船舶重工集团海装风电股份有限公司 | Synchronous pressing device for expansion sleeve and installation method of expansion sleeve |
| CN116117497A (en) * | 2023-01-10 | 2023-05-16 | 中国神华煤制油化工有限公司 | Mounting and dismounting device for bolts |
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