CN103231235B - Hydraulic preloader - Google Patents
Hydraulic preloader Download PDFInfo
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- CN103231235B CN103231235B CN201310161578.0A CN201310161578A CN103231235B CN 103231235 B CN103231235 B CN 103231235B CN 201310161578 A CN201310161578 A CN 201310161578A CN 103231235 B CN103231235 B CN 103231235B
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Abstract
The present invention relates to a kind of Hydraulic preloader that accurately can apply pretightning force.This Hydraulic preloader, comprises base, piston, oil cylinder, pull bar, adapter sleeve, nut sleeve, driving lever; Base is hollow, and its one end is pressed on connector when using state; Piston is fixedly connected on the other end of base; Oil cylinder is sleeved on piston, can slide axially along outside piston side face; Described piston exposes oil cylinder and is provided with scale near one end of base; Pull bar runs through the through hole of its centre, and it passes piston and is provided with away from one end of base the collar flange that at least covers the portion end surface of oil cylinder; Pull bar passes piston and is fixedly connected with adapter sleeve near one end of base, and adapter sleeve is fixedly connected with bolt when using state; Nut sleeve is positioned at the endoporus of base, is sleeved on nut when using state, and its side is provided with jack; Base side and nut sleeve side opposite position are provided with and insert opening in nut sleeve jack for driving lever.
Description
Technical field
The present invention relates to a kind of Hydraulic preloader.
Background technology
Between connected compcnent, fastening force requires larger, generally need the pretightning force of bolt applying along bolt direction of axis line.Apply the object of pretightning force and be to strengthen the reliability and compactness that connect, there is gap or Relative sliding between connected compcnent after preventing stand under load.But if too high pretightning force is applied with to bolt, also often can cause the inefficacy connected.Therefore, the pretightning force accurately applying bolt is very important.And our box spanner through being commonly used to apply this pretightning force can not control the length of bolt lengthening exactly, need to rely on the qualification of workman to ensure to apply the accuracy of pretightning force, the pretightning force that general green hand is applied to bolt is larger or fewer.
Summary of the invention
The object of the present invention is to provide a kind of Hydraulic preloader that accurately can apply pretightning force.
Technical scheme of the present invention is: a kind of Hydraulic preloader, comprises base, piston, oil cylinder, pull bar, adapter sleeve, nut sleeve, driving lever; Described base is hollow, and one end of base is pressed on connector when using state; The other end of base is fixedly connected with piston, and oil cylinder is sleeved on piston, can slide axially along piston; Pull bar runs through whole piston, can slide axially along piston; Pull bar passes piston and is provided with a collar flange radially stretched out away from one end of base, and the collar flange of pull bar is at least adjacent to the part of oil cylinder away from the end face of base side when using state; Pull bar passes piston and is fixedly connected with adapter sleeve near one end of base, adapter sleeve near one end of base in using state time be fixedly connected with the thread segment of bolt; Nut sleeve is positioned at the endoporus of base, and its side is provided with jack, is sleeved on nut when using state; The side of base and nut sleeve side opposite position are provided with and insert opening in the jack of nut sleeve for driving lever, can haul driving lever swing towards base circumferencial direction when using state, drive nut rotation.
In use, base is pressed on connector Hydraulic preloader of the present invention, and piston is fixedly connected with base, and when manually pump is to oil cylinder oiling, oil cylinder can deviate from base along the axis of piston and move.When oil cylinder touches the collar flange of pull bar, pull bar also can deviate from base along the axis of piston and move, and because the other end of pull bar is connected with the thread segment of bolt by adapter sleeve, pull bar deviates from that base moves can by bolt lengthening.Because the pretightning force of bolt and the oil pressure of manual pump have certain relation, just oiling can be stopped when the oil pressure of manual pump display reaches predetermined value.Nut sleeve was just set on bolt before base is pressed on connector, as long as now insert driving lever from the opening of base in the jack of nut sleeve side, stir driving lever along base circumferencial direction, make nut to the motion of connector direction, just can complete the pretension of screw bolt and nut.Use this Hydraulic preloader, the pretightning force not only applied is accurate, and hydraulic coupling oil cylinder and piston applying, also saves manpower.
Further preferred embodiment of the present invention is: described piston comprises cock body and towards the body of rod deviating from base direction and extend, be coaxially connected with cock body, described base is fixedly connected with the plug body part of piston; Described oil cylinder forms by cylinder cap with towards the casing wall extending near base direction, be connected with cylinder cap, and the central authorities of cylinder cap are provided with the through hole passed for the body of rod, are equipped with seal between cock body and casing wall, between the body of rod and cylinder cap hole wall.
Further preferred embodiment of the present invention is: described piston and oil cylinder only respectively have 1, and the cock body of described piston is provided with a boss extended radially outward near base end, and described base is fixedly connected with the boss of piston cock body; When piston and oil cylinder be in completely compressive state time, the raised head face of piston is adjacent to the end face of oil cylinder casing wall; When bolt is pulled to predetermined length, occurs one between the raised head face of piston and the casing wall end face of oil cylinder and can fill in the space that thickness equals the predetermined tensile elongation pad of bolt.
Further preferred embodiment of the present invention is: described oil cylinder and piston respectively have 2 or 3, is fixed together between described oil cylinder with the screw rod be located on casing wall; The pouring orifice of described oil cylinder is also all positioned on casing wall, and by the oiling expanding channels be positioned on casing wall together, the opening of oiling passage is positioned at the outer face of cylinder cap to the pouring orifice between each oil cylinder.
Accompanying drawing explanation
The elevation cross-sectional view of the first Hydraulic preloader of Fig. 1
Fig. 2 piston profile
Fig. 3 oil cylinder profile
Fig. 4 bolt tension is to the first Hydraulic preloader elevation cross-sectional view during predetermined length
The elevation cross-sectional view of Fig. 5 the second Hydraulic preloader
The elevation cross-sectional view of the third Hydraulic preloader of Fig. 6
The side view of Fig. 7 second and third kind of Hydraulic preloader
Detailed description of the invention
As shown in Figure 1, the Hydraulic preloader that the present invention relates to comprises base 1, piston 2, oil cylinder 3, pull bar 4, adapter sleeve 5, nut sleeve 6, driving lever 7, seal 9 and oiling path 10.
Base 1 is in hollow form, and its one end is pressed on connector when Hydraulic preloader is in using state.Piston 2 is fixedly connected with marking closely screw with base 1 other end, and the central authorities of piston 2 are provided with through hole.Oil cylinder 3 is set with on the piston 2, with piston 2 matched in clearance, can slide axially along the outer circumference surface of piston 2.Pull bar 4 runs through the whole center through hole of piston 2, can slide axially along this through hole.Pull bar 4 passes piston 2 and is provided with a collar flange radially stretched out 41 away from one end of base 1, and the collar flange 41 of pull bar 4 is at least adjacent to the part of oil cylinder 3 away from the end face of base 1 side when using state.Pull bar 4 passes piston 2 and is provided with external screw thread near one end of base 1.Adapter sleeve 5 central authorities are provided with endoporus, and endoporus is provided with two sections of internal threads, and the external screw thread of the internal thread and pull bar 4 that deviate from base 1 end is connected.Internal thread near base 1 one end in adapter sleeve 5 endoporus is fixedly connected with the thread segment of bolt when using state.Nut sleeve 6 is positioned at the endoporus of base 1, coaxial with adapter sleeve 5, is sleeved on nut when using state.The side of nut sleeve 6 is provided with several jacks 61.Base 1 side and nut sleeve 6 side opposite position are provided with and insert opening in nut sleeve 6 jack 61 for driving lever 7, can haul driving lever 7 and swing towards base 1 circumferencial direction, drive nut rotation when using state.
Shown in composition graphs 2 and 3, piston 2 comprises cock body 21 and towards the body of rod 22 deviating from base 1 direction and extend, be coaxially connected with cock body 21.Oil cylinder 3 forms by cylinder cap 31 with towards the casing wall 32 extending near base 1 direction, be connected with cylinder cap 31.The central authorities of cylinder cap 31 are provided with the through hole passed for the body of rod 22.Seal 9 is equipped with between cock body 21 and casing wall 32, between the body of rod 22 and cylinder cap 31 hole wall.The structure axial dimension of this piston 2 and oil cylinder 3 is less, is adapted to the occasion that the axial installing space of some nuts and bolts is less especially.Cock body 21 is provided with a boss extended radially outward 23 towards base 1 end, and this boss 23 is adjacent to the end face of casing wall 32 when piston 2 and oil cylinder 3 are in complete compressive state.Better mode is marked with a scale at the cock body 23 excircle subscript of piston 2, and scale, increases along deviating from base 1 direction for zero point gradually with cock body 21 and boss 23 junction.More adequately bolt can be moved to the tensile elongation preset together with the oil pressure of manual pump like this.
Bolt tension is to the first Hydraulic preloader elevation cross-sectional view during predetermined length as shown in Figure 4, now occurs between boss 23 end face of piston 2 and casing wall 32 end face of oil cylinder 3 that a width equals the predetermined tensile elongation space of bolt.Now one piece of thickness can be equaled the pad 11 that bolt makes a reservation for draw high length and fill in this gap.The pretightning force of Hydraulic preloader can be kept like this with pad 11, and not by keeping the mode of oil pressure in oil cylinder 3 to keep the pretightning force of Hydraulic preloader with hand oil pump.
As shown in Figure 5 and Figure 6 second and the elevation cross-sectional view of the third Hydraulic preloader, described oil cylinder and piston respectively have 2,3 respectively.Compared to Figure 1, the piston 2 newly increased eliminates boss 23, and the oil cylinder newly increased 3 is similar with oil cylinder 3 before.As shown in Figure 7, the oil cylinder 3 the newly increased screw rod 8 be located on casing wall 32 is fixed together with original oil cylinder 3, and these oil cylinders 3 can link together like this.The pouring orifice of oil cylinder 3 is all positioned on casing wall 32, and the pouring orifice between each oil cylinder 3 is linked together by the oiling path 10 be positioned on casing wall 32, and the opening of oiling path 10 is positioned at the outer face of cylinder cap 31.
The using method of this Hydraulic preloader is:
1, the pretightning force required for selected bolt and nut size and quantity and connector calculates the length L that each bolt needs to stretch, and produces the pad 11 that a thickness is L.
2, be sleeved on nut by nut sleeve 6, be sleeved on nut bolt by base 1, the bottom of base 1 is pressed on connector, adapter sleeve 5 is fixed on the thread segment of bolt, makes the collar flange 41 of pull bar 4 be close to the outer face of oil cylinder 3 cylinder cap 31.
3, from oiling passage to oil cylinder 3 oiling, along with the injection of hydraulic oil, oil cylinder 3 moves to away from base 1 direction, the collar flange 41 that push pull bar 4 drives pull bar 4 along deviating from base 1 direction tensile bolt, when the oil pressure that hand oil pump is read equals predetermined oil pressure, stop to oil cylinder 3 oiling, and fill in pad 11 in the gap of casing wall 33 end face of boss 23 end face of piston 2 and oil cylinder 3, now the hydraulic oil in oil cylinder 3 can be bled off.
4, the circumferencial direction along base 1 stirs driving lever 7, and the nut sleeve 6 be connected with driving lever 7 drives nut to rotate on bolt, and moves towards connector direction.
5, when nut is adjacent to connector again, take off driving lever 7, unclamp the connection of adapter sleeve 5 and bolt thread section, whole Hydraulic preloader removed from connector, extract pad 11, take off nut sleeve 6, tools for bolts ' pretension completes.
Claims (5)
1. a Hydraulic preloader, is characterized in that: comprise base (1), piston (2), oil cylinder (3), pull bar (4), adapter sleeve (5), nut sleeve (6), driving lever (7);
Described base (1) is hollow, is pressed on connector when using state;
The other end of base (1) is fixedly connected with piston (2), and oil cylinder (3) is sleeved on piston (2), can slide axially along piston (2) outer circumference surface;
Pull bar (4) runs through whole piston (2), can slide axially along piston (2);
Pull bar (4) passes piston (2) and is provided with a collar flange radially stretched out (41) away from one end of base (1), and the collar flange (41) of pull bar (4) is at least adjacent to the part of oil cylinder (3) away from the end face of base (1) side when using state;
Pull bar (4) passes piston (2) and is fixedly connected with adapter sleeve (5) near one end of base (1), and adapter sleeve (5) is fixedly connected with the thread segment of bolt when using state near one end of base (1);
Nut sleeve (6) is positioned at the endoporus of base (1), and its side is provided with jack (61), is sleeved on nut when using state;
The side of base (1) and nut sleeve (6) side opposite position are provided with and insert opening in the jack (61) of nut sleeve (6) for driving lever (7), driving lever (7) can be hauled swing towards base (1) circumferencial direction when using state, and then drive nut rotation.
2. Hydraulic preloader according to claim 1, described piston (2) comprises cock body (21) and towards the body of rod (22) deviating from base (1) direction and extend, be coaxially connected with cock body (21), described base (1) is fixedly connected with cock body (21) portion of piston (2); Described oil cylinder (3) forms by cylinder cap (31) with towards the casing wall (32) extending near base (1) direction, be connected with cylinder cap (31), the central authorities of cylinder cap (31) are provided with the through hole passed for the body of rod (22), are equipped with seal (9) between cock body (21) and casing wall (32), between the body of rod (22) and cylinder cap (31) hole wall.
3. Hydraulic preloader according to claim 2, described piston (2) and oil cylinder (3) only respectively have 1, the cock body (21) of described piston (2) is provided with a boss extended radially outward (23) near base (1) end, and described base (1) is fixedly connected with the boss (23) of piston (2) cock body (21); When piston (2) and oil cylinder (3) be in completely compressive state time, boss (23) end face of piston (2) is adjacent to the end face of oil cylinder (3) casing wall (32); When bolt is pulled to predetermined length, occurs one between boss (23) end face of piston (2) and casing wall (32) end face of oil cylinder (3) and the space that thickness equals the predetermined tensile elongation pad (11) of bolt can be filled in.
4. Hydraulic preloader according to claim 2, described oil cylinder and piston respectively have 2 or 3, are fixed together between described oil cylinder (3) with the screw rod (8) be located on casing wall (32); The pouring orifice of described oil cylinder (3) is also all positioned on casing wall (32), and the pouring orifice between each oil cylinder (3) is linked together by the oiling passage (10) be positioned on casing wall (32), and the opening of oiling passage (10) is positioned at the outer face of cylinder cap (31).
5. Hydraulic preloader according to claim 4, piston (2) cock body (21) portion of holding near base (1) is provided with near base (1) end the boss (23) extended radially outward, and described base (1) is fixedly connected with the boss (23) in piston (2) cock body (21) portion; When piston (2) and oil cylinder (3) are in complete compressive state, boss (23) end face of piston (2) is adjacent to casing wall (32) end face of oil cylinder (3); When bolt is pulled to predetermined length, occurs one between boss (23) end face of piston (2) and casing wall (32) end face of oil cylinder (3) and the space that thickness equals the predetermined tensile elongation pad (11) of bolt can be filled in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310161578.0A CN103231235B (en) | 2013-05-04 | 2013-05-04 | Hydraulic preloader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310161578.0A CN103231235B (en) | 2013-05-04 | 2013-05-04 | Hydraulic preloader |
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| Publication Number | Publication Date |
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| CN103231235A CN103231235A (en) | 2013-08-07 |
| CN103231235B true CN103231235B (en) | 2015-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310161578.0A Active CN103231235B (en) | 2013-05-04 | 2013-05-04 | Hydraulic preloader |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113441940B (en) * | 2021-06-30 | 2022-09-27 | 哈尔滨工业大学 | Piezoelectric transducer pre-tightening assembly device and method loaded along axial direction of bolt |
| CN116728352B (en) * | 2023-08-15 | 2023-10-13 | 山东高速轨道交通集团有限公司益羊铁路管理处 | Locomotive diesel engine cylinder cap nut dismounting device and dismounting method |
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| CN101648336A (en) * | 2009-09-11 | 2010-02-17 | 海泰斯（北京）工程设备有限公司 | Bolt fastening system |
| CN201755752U (en) * | 2010-04-27 | 2011-03-09 | 江苏普菲特液压机械有限公司 | Hydraulic bolt tightening device |
| CN201970082U (en) * | 2011-01-25 | 2011-09-14 | 江苏拓盛重工机械有限公司 | Fixed-type hydraulic pre-tightening device for bolt |
| CN102267050A (en) * | 2011-01-25 | 2011-12-07 | 南通高盛机械制造有限公司 | Hydraulic pretightening device for automatic regroup bolts |
| CN202491059U (en) * | 2012-03-20 | 2012-10-17 | 程玉春 | Novel nut dismounting and mounting machine of petroleum machinery equipment |
| CN203254367U (en) * | 2013-05-04 | 2013-10-30 | 中钢集团衡阳重机有限公司 | Hydraulic pretightener |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008025071A1 (en) * | 2008-05-26 | 2009-12-03 | Wirtgen Gmbh | Tool for disassembling a chisel |
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2013
- 2013-05-04 CN CN201310161578.0A patent/CN103231235B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101648336A (en) * | 2009-09-11 | 2010-02-17 | 海泰斯（北京）工程设备有限公司 | Bolt fastening system |
| CN201755752U (en) * | 2010-04-27 | 2011-03-09 | 江苏普菲特液压机械有限公司 | Hydraulic bolt tightening device |
| CN201970082U (en) * | 2011-01-25 | 2011-09-14 | 江苏拓盛重工机械有限公司 | Fixed-type hydraulic pre-tightening device for bolt |
| CN102267050A (en) * | 2011-01-25 | 2011-12-07 | 南通高盛机械制造有限公司 | Hydraulic pretightening device for automatic regroup bolts |
| CN202491059U (en) * | 2012-03-20 | 2012-10-17 | 程玉春 | Novel nut dismounting and mounting machine of petroleum machinery equipment |
| CN203254367U (en) * | 2013-05-04 | 2013-10-30 | 中钢集团衡阳重机有限公司 | Hydraulic pretightener |
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| CN103231235A (en) | 2013-08-07 |
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Effective date of registration: 20180705 Address after: No. 1, Dongfeng Road, Zhu Hui District, Hengyang, Hunan Patentee after: China Steel Group Hengyang Machinery Co., Ltd. Address before: No. 1, Dongfeng Road, Zhu Hui District, Hengyang, Hunan Patentee before: Sinosteel Hengyang Machinery Co., Ltd. |
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