CN203227995U - Double-stage hydraulic stretcher - Google Patents
Double-stage hydraulic stretcher Download PDFInfo
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- CN203227995U CN203227995U CN 201320214368 CN201320214368U CN203227995U CN 203227995 U CN203227995 U CN 203227995U CN 201320214368 CN201320214368 CN 201320214368 CN 201320214368 U CN201320214368 U CN 201320214368U CN 203227995 U CN203227995 U CN 203227995U
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Abstract
The utility model discloses a double-stage hydraulic stretcher which comprises a hydraulic cylinder, a stretching assembly and a supporting bridge. The hydraulic cylinder is a double-stage hydraulic cylinder with a first piston and a second piston, the first piston and the second piston are arranged from front to back in a stretched direction of a bolt, and the movement directions of the first piston and the second piston of the hydraulic cylinder are identical; a connecting structure which is connected with the bolt to be stretched is arranged at one end of the stretching assembly, and the other end of the stretching assembly moves towards the stretched direction of the bolt under the pushing action of the first piston; the supporting bridge is fixedly connected with one end of the hydraulic cylinder and is provided with a nut cavity, a nut of the bolt to be stretched is accommodated in the nut cavity and is limited by the nut cavity, and a shifting ring which is used for spinning the nut is arranged in the nut cavity. The double-stage hydraulic stretcher has the advantages that shortcomings of high required pressure, power waste and high risks of an existing hydraulic stretcher are overcome, the pressure required by the double-stage hydraulic stretcher can be reduced, accordingly, energy is saved, and the safety performance is improved.
Description
Technical field
The utility model relates to a kind of hydraulic pressure that utilizes as the stretcher of power.Be specially a kind of double-stage hydraulic stretcher.
Background technology
In high pressure, high temperature and other equipment that air-tightness is had relatively high expectations, the connection between the parts relies on a plurality of bolt locking flanges to realize, to satisfy bubble-tight requirement.Because the bolt that these equipment adopt is thicker, its pretightning force is very big, if the fastening and dismounting of bolt by manually finishing, labour intensity is very high.In addition, because that the connection between parts needs is several, tens even tens bolts are realized, manually carry out fastening successively to bolt and dismounting, can cause the stress distribution of each link position inhomogeneous, thereby influence the intensity of connector and the seal degree of equipment.
At present, the hydraulic elongators that adopt stretch to bolt more, its operation principle is to inject hydraulic oil promotion piston bolt is applied tensile force in hydraulic jack, bolt is elongated, afterwards, fastening or the easier realization of disassembling section meeting that bolt is carried out, and can realize that fastening pretightning force is controlled and act on uniformly on flange and the pad.
But the hydraulic pressure of the pressure oil that present hydraulic elongator is required is very high, so the volume of hydraulic elongator can be bigger, usage space is limited to, and the pressure that hydraulic power supply provides also can be very big, and is very high to the requirement of stretcher material and sealing, and have certain danger.
The utility model content
The technical problem that the utility model solves is to overcome the required pressure height of existing hydraulic elongator, it is high and have a dangerous shortcoming to the requirement of material and sealing to cause stretcher to bear the pressure height, a kind of double-stage hydraulic stretcher that reduces the required pressure of hydraulic elongator is provided, thereby energy savings improves security.
Double-stage hydraulic stretcher of the present utility model comprises:
Hydraulic cylinder, described hydraulic cylinder are the double-stage hydraulic cylinder with first piston and second piston, described first piston and second piston on bolt is stretched direction, arrange from front to back and the first piston of described hydraulic cylinder identical with the direction of motion of second piston;
Stretching assembly, described stretching assembly one end has and bolted syndeton to be stretched, and the other end of described stretching assembly moves to the direction that is stretched under the promotion of described first piston;
Supporting bridge, described supporting bridge is fixedlyed connected with described hydraulic cylinder one end, and described supporting bridge has the nut cavity that holds the nut for the treatment of tensile bolt and limit the position of described nut, has the ring for the described nut of rotation in the described nut cavity.
As preferably, the rear end face of described first piston comprises first and second portion at least, and described first is vertical with described first piston travel direction, and offsets with the described second piston nose face; Described hydraulic cylinder also is provided with the first oil pocket wall, the described first oil pocket wall extend between the front end face of the second portion of rear end face of described first piston and described second piston, and the shape of the second portion of the rear end face of the shape of the described first oil pocket wall and first piston is suitable; Described hydraulic cylinder is provided with the first oiling road, and the described first oiling road one end communicates with first pouring orifice on being located at cylinder wall, and the other end extends to the rear end face of described first piston; Described hydraulic cylinder also is provided with the second oil pocket wall relative with the rear end face of described second piston, and the rear end face of the shape of the described second oil pocket wall and described second piston is suitable; Described hydraulic cylinder also is provided with the second oiling road, and the described second oiling road one end communicates with second pouring orifice on being located at described cylinder wall, and the other end extends to the rear end face of described second piston.
As preferably, the second portion of the rear end face of described first piston comprises first parallel walls parallel with described first and second parallel walls, and described first parallel walls, second parallel walls and first arrange according to order from front to back; The second portion of the rear end face of described first piston also comprises the first side wall that connects described first and described first parallel walls, connect second sidewall, parallel with the inwall of described hydraulic cylinder and can be with respect to the 3rd sidewall of the inwall slip of hydraulic cylinder of described first parallel walls and second parallel walls, and the other end in the described first oiling road extends to second parallel walls of the rear end face of described first piston; The shape of the rear end face of described second piston is identical with the shape of the rear end face of described first piston, and the other end in the described second oiling road extends to second parallel walls of the rear end face of described second piston.
As preferably, be provided with first sealing ring between the 3rd sidewall of described first piston and the inwall of described hydraulic cylinder, be provided with second sealing ring between the first side wall of described first piston and the described first oil pocket wall, be provided with the 3rd sealing ring between the 3rd sidewall of described second piston and the inwall of described hydraulic cylinder, be provided with the 4th sealing ring between the first side wall of described second piston and the described second oil pocket wall.
As preferably, described stretching assembly comprises the stretching bar, and described double-stage hydraulic cylinder has first cavity that extends and allow described stretching bar to pass along the direction of motion of described first piston, and described supporting bridge has second cavity that allows described stretching bar to pass.
As preferably, the diameter of part that described stretching bar is positioned at first cavity of described hydraulic cylinder is positioned at the diameter of part of second cavity of described supporting bridge less than described connecting rod, and described stretching assembly also comprises stretching head, the diameter of described stretching head is greater than the diameter of first cavity of described hydraulic cylinder, described stretching head is connected with the end that described stretching bar passes first cavity of described hydraulic cylinder, and between described stretching head and the described stretching bar for removably connecting.
As preferably, between described stretching head and the described stretching bar by being threaded.
As preferably, described syndeton is the internal thread that cooperates with the external screw thread of described bolt.
As preferably, described first pouring orifice is connected by oil fuel tube with described second pouring orifice, and described oil fuel tube is provided with the oiling joint that at least one is used for oiling.
Double-stage hydraulic stretcher of the present utility model is compared with prior art, has following beneficial effect:
1, double-stage hydraulic stretcher of the present utility model is owing to adopted the double-stage hydraulic cylinder, the hydraulic pressure of power source can be decreased to about 1/2 of common hydraulic elongator, thereby saved resource greatly, reduced the pressure that bears of stretcher inner sealing and cylinder body simultaneously, reduced danger, use is safer.
2, first piston and second piston be arranged so that hydraulic cylinder starts the time, the stressed motion simultaneously of first piston and second piston, start-up time is short, the efficient height.
3, the stretching bar diameter of part that is positioned at first cavity of hydraulic cylinder is positioned at the diameter of part of second cavity of supporting bridge less than connecting rod, so can make the diameter of first cavity as far as possible little, make the cross-sectional area of first piston and second piston big as far as possible simultaneously, so that hydraulic cylinder is finished the stretching of bolt under littler hydraulic pressure, thereby further economize on resources.
Description of drawings
Fig. 1 is the structural representation of the double-stage hydraulic stretcher of an embodiment of the utility model.
The 1-hydraulic cylinder, 2-supporting bridge, 3-first piston, 4-second piston, 5-bolt, 6-nut, the 7-ring, 8-first, the 9-first oil pocket wall, the 10-first oiling road, 11-first pouring orifice, the 12-second oil pocket wall, the 13-second oiling road, 14-second pouring orifice, 15-first parallel walls, 16-second parallel walls, 18-the first side wall, 19-second sidewall, 20-the 3rd sidewall, 21-first sealing ring, 22-second sealing ring, 23-the 3rd sealing ring, 24-the 4th sealing ring, 26-stretching bar, 27-stretching head, the 28-oil fuel tube, 29-oiling joint.
The specific embodiment
Double-stage hydraulic stretcher of the present utility model as shown in Figure 1, comprises hydraulic cylinder 1, stretching assembly and supporting bridge 2.In the utility model, hydraulic cylinder 1 is for having the double-stage hydraulic cylinder 1 of first piston 3 and second piston 4.The first piston 3 of hydraulic cylinder 1 is identical with the direction of motion of second piston 4, and arranges from front to back on being stretched direction at bolt 5.In the utility model, " preceding " refers to the direction that bolt 5 is stretched.
Stretching assembly one end has and bolt to be stretched 5 connection structure connecting, and in the present embodiment, syndeton is the internal thread that cooperates with the external screw thread of bolt 5.To the direction motion that is stretched, in the present embodiment, the front end face of the rear end face of the other end of stretching assembly and first piston 3 offsets the other end of stretching assembly under the promotion of first piston 3.
Supporting bridge 2 is fixedlyed connected with hydraulic cylinder 1 one ends, and supporting bridge 2 has the nut cavity that holds the nut 6 for the treatment of tensile bolt 5 and limit the position of nut 6, has the ring 7 for rotation nut 6 in the nut cavity.
Be example so that bolt 5 is fastened on flange and the connector, one end of bolt 5 is connected with nut 6 after passing flange and connector, and namely nut 6 is screwed on the bolt 5, because high-voltage high-temperature equipment is very high to bubble-tight requirement, therefore, the fastening need of bolt 5 reach very high intensity.At this moment, as shown in Figure 1, supporting bridge 2 is contained on the bolt to be stretched 5, nut 6 is placed in the nut cavity.To treat that tensile bolt 5 and stretching assembly couple together, in the present embodiment, namely rotate whole double-stage hydraulic stretcher, stretching assembly and bolt 5 are fixed together.The top motion in the figure of primer fluid cylinder pressure 1, first piston 3 and second piston 4 moves upward thereby drive stretching assembly, because stretching assembly and bolt 5 be fixed together, so bolt 5 is elongated in its regime of elastic deformation.Rotate ring 7 this moment, and nut 6 rotations are fastened on the bolt 5.Behind first piston 3 and second piston, 4 returns, the distortion meeting of bolt 5 partly recovers, and this moment, nut 6 can be against on connector or the flange more tightly, thereby made connector tightr with being connected of flange, and then improves the air-tightness of equipment.Operation during demounting bolt 5 and above-mentioned when fastening class of operation seemingly, the direction of rotation difference of plectrum just.When bolt 5 has when a plurality of, can adopt a plurality of double-stage hydraulic stretchers, carry out aforesaid operations simultaneously, can prevent that bolt 5 from producing unbalanced stress when fastening or dismounting successively.
Stretcher of the present utility model can reduce power source greatly owing to adopted double-stage hydraulic cylinder 1, as needing hydraulic power supply that hydraulic pressure about 100MPa is provided for the bolt 5 of 85mm elongates 8mm diameter.。And in the utility model, only need power source to have hydraulic pressure about 50MPa, be specially, first piston 3 and second piston 4 all are subjected to the hydraulic pressure of 50MPa, and first piston 3 is except being subjected to the pressure of hydraulic pressure, also can be subjected to the jacking force of second piston 4, therefore, the suffered power of the piston of the single stage hydraulic cylinder 1 that the power that first piston 3 is suffered and power source are 100MPa is similar.So, reduced the pressure of power source greatly, thereby can economize on resources greatly, and safer.
As preferably, the rear end face of first piston 3 comprises first 8 and second portion at least, and first 8 is vertical with first piston 3 travel directions, and offsets with the front end face of second piston 4.Hydraulic cylinder 1 also is provided with between the second portion and second piston, 4 front end faces that the first oil pocket wall, 9, the first oil pocket walls 9 extend into first piston 3 rear end faces, and the shape of the second portion of the shape of the first oil pocket wall 9 and first piston 3 rear end faces is suitable.Hydraulic cylinder 1 is provided with 10, the first oiling roads, the first oiling road, 10 1 ends and communicates with first pouring orifice 11 on being located at hydraulic cylinder 1 wall, and the other end extends to the rear end face of first piston 3.It is suitable that hydraulic cylinder 1 also is provided with the rear end face of the shape of second oil pocket wall 12, the second oil pocket walls 12 relative with the rear end face of second piston 4 and second piston 4.Hydraulic cylinder 1 also is provided with 13, the second oiling roads, the second oiling road, 13 1 ends and communicates with second pouring orifice 14 on being located at hydraulic cylinder 1 wall, and the other end extends to the rear end face of second piston 4.
When hydraulic jack starts, hydraulic oil flow to the rear end face of first piston 3 by first pouring orifice 11 and the first oiling road 10, flow to the rear end face of second piston 4 simultaneously by second pouring orifice 14 and the second oiling road 13, and to promote first piston 3 and second piston 4 forwards be top motion among Fig. 1.Between the inwall of rear end face, the first oil pocket wall 9 and the hydraulic cylinder 1 of first piston 3, form the first oil pocket (not shown), between the inwall of rear end face, the second oil pocket wall 12 and the hydraulic cylinder 1 of second piston 4, form the second oil pocket (not shown).
As further preferred, the second portion of the rear end face of first piston 3 comprises that first parallel walls 15 and second parallel walls 16, the first parallel walls 15, second parallel walls 16 and the first 8 parallel with first 8 arrange according to order from front to back.The second portion of the rear end face of first piston 3 also comprises the first side wall 18 that connects first 8 and first parallel walls 15, connect second sidewall 19, parallel with the inwall of hydraulic cylinder 1 and can be with respect to the 3rd sidewall 20 of the inwall slip of hydraulic cylinder 1 of first parallel walls 15 and second parallel walls 16.In the present embodiment, the first side wall 18 is obliquely installed with respect to the 3rd sidewall 20, and the other end in the first oiling road 10 extends to second parallel walls 16 of the rear end face of first piston 3.The shape of the rear end face of second piston 4 is identical with the shape of the rear end face of first piston 3, and the other end in the second oiling road 13 extends to second parallel walls of the rear end face of second piston 4.
As preferably, be provided with first sealing ring 21 between the 3rd sidewall 20 of first piston 3 and the inwall of hydraulic cylinder 1, prevent that hydraulic oil from flowing out first oil pocket between the inwall of the 3rd sidewall 20 of first piston 3 and hydraulic cylinder 1.Be provided with second sealing ring 22 between the first side wall 18 of first piston 3 and the first oil pocket wall 9, prevent that hydraulic oil from flowing out first oil pocket between the first side wall 18 of first piston 3 and the first oil pocket wall 9.Be provided with the 3rd sealing ring 23 between the 3rd sidewall of second piston 4 and the inwall of hydraulic cylinder 1, prevent that hydraulic oil from flowing out second oil pocket between the inwall of the 3rd sidewall of second piston 4 and hydraulic cylinder 1, be provided with the 4th sealing ring 24 between the first side wall of second piston 4 and the second oil pocket wall 12, prevent that hydraulic oil from flowing out second oil pocket between the first side wall of second piston 4 and the second oil pocket wall 12.In addition, in the present embodiment, each sealing ring is provided with pad.
As preferably, stretching assembly comprises stretching bar 26, and double-stage hydraulic cylinder 1 has along the direction of motion of first piston 3 and extends and allow described stretching bar 26 to pass first cavity, and supporting bridge 2 has second cavity that passes that allows stretching bar 26.
In the present embodiment, the diameter of part that stretching bar 26 is positioned at first cavity of hydraulic cylinder 1 is positioned at the diameter of part of second cavity of supporting bridge 2 less than connecting rod, so can make the diameter of first cavity as far as possible little, the cross-sectional area of first piston 3 and second piston 4 is big as far as possible simultaneously, so that hydraulic cylinder 1 is finished the stretching of bolt 5 under littler hydraulic pressure, thereby further economize on resources.
Stretching assembly also comprises stretching head 27, and the diameter of stretching head 27 is greater than the diameter of first cavity of hydraulic cylinder 1, and stretching head 27 is connected with the end that stretching bar 26 passes first cavity of hydraulic cylinder 1, and between stretching head 27 and the stretching bar 26 for removably connecting.In the present embodiment, between stretching head 27 and the stretching bar 26 by being threaded.
The assembling sequence of stretching assembly and hydraulic cylinder 1 is that the end that stretching bar 26 diameters are less passes from second cavity of supporting bridge 2, and makes its first cavity that passes hydraulic cylinder 1, at its end that passes first cavity stretching head 27 is installed.
As preferably, first pouring orifice 11 is connected by oil fuel tube 28 with second pouring orifice 14, and oil fuel tube 28 is provided with the oiling joint 29 that at least one is used for oiling, and in the present embodiment, oil fuel tube 28 is provided with two oiling joints 29, can be simultaneously to hydraulic cylinder 1 oiling.
Above embodiment is exemplary embodiment of the present utility model only, is not used in restriction the utility model, and protection domain of the present utility model is defined by the claims.Those skilled in the art in essence of the present utility model and protection domain, various modifications that the utility model is made or be equal to replacement and also drop in the protection domain of the present utility model.
Claims (9)
1. a double-stage hydraulic stretcher is characterized in that, comprising:
Hydraulic cylinder, described hydraulic cylinder are the double-stage hydraulic cylinder with first piston and second piston, described first piston and second piston on bolt is stretched direction, arrange from front to back and the first piston of described hydraulic cylinder identical with the direction of motion of second piston;
Stretching assembly, described stretching assembly one end has and bolted syndeton to be stretched, and the other end of described stretching assembly moves to the direction that is stretched under the promotion of described first piston;
Supporting bridge, described supporting bridge is fixedlyed connected with described hydraulic cylinder one end, and described supporting bridge has the nut cavity that holds the nut for the treatment of tensile bolt and limit the position of described nut, has the ring for the described nut of rotation in the described nut cavity.
2. double-stage hydraulic stretcher according to claim 1, it is characterized in that, the rear end face of described first piston comprises first and second portion at least, and described first is vertical with described first piston travel direction, and offsets with the front end face of described second piston; Described hydraulic cylinder also is provided with the first oil pocket wall, the described first oil pocket wall extend between the front end face of the second portion of rear end face of described first piston and described second piston, and the shape of the second portion of the shape of the described first oil pocket wall and first piston rear end face is suitable; Described hydraulic cylinder is provided with the first oiling road, and the described first oiling road one end communicates with first pouring orifice on being located at cylinder wall, and the other end extends to the rear end face of described first piston; Described hydraulic cylinder also is provided with the second oil pocket wall relative with the rear end face of described second piston, and the rear end face of the shape of the described second oil pocket wall and described second piston is suitable; Described hydraulic cylinder also is provided with the second oiling road, and the described second oiling road one end communicates with second pouring orifice on being located at described cylinder wall, and the other end extends to the rear end face of described second piston.
3. double-stage hydraulic stretcher according to claim 2, it is characterized in that, the second portion of the rear end face of described first piston comprises first parallel walls parallel with described first and second parallel walls, and described first parallel walls, second parallel walls and first arrange according to order from front to back; The second portion of the rear end face of described first piston also comprises the first side wall that connects described first and described first parallel walls, connect second sidewall, parallel with the inwall of described hydraulic cylinder and can be with respect to the 3rd sidewall of the inwall slip of hydraulic cylinder of described first parallel walls and second parallel walls, and the other end in the described first oiling road extends to second parallel walls of the rear end face of described first piston; The shape of the rear end face of described second piston is identical with the shape of the rear end face of described first piston, and the other end in the described second oiling road extends to second parallel walls of the rear end face of described second piston.
4. double-stage hydraulic stretcher according to claim 3, it is characterized in that, be provided with first sealing ring between the 3rd sidewall of described first piston and the inwall of described hydraulic cylinder, be provided with second sealing ring between the first side wall of described first piston and the described first oil pocket wall, be provided with the 3rd sealing ring between the 3rd sidewall of described second piston and the inwall of described hydraulic cylinder, be provided with the 4th sealing ring between the first side wall of described second piston and the described second oil pocket wall.
5. according to each described double-stage hydraulic stretcher among the claim 1-4, it is characterized in that, described stretching assembly comprises the stretching bar, described double-stage hydraulic cylinder has first cavity that extends and allow described stretching bar to pass along the direction of motion of described first piston, and described supporting bridge has second cavity that allows described stretching bar to pass.
6. double-stage hydraulic stretcher according to claim 5, it is characterized in that, the diameter of part that described stretching bar is positioned at first cavity of described hydraulic cylinder is positioned at the diameter of part of second cavity of described supporting bridge less than described connecting rod, and described stretching assembly also comprises stretching head, the diameter of described stretching head is greater than the diameter of first cavity of described hydraulic cylinder, described stretching head is connected with the end that described stretching bar passes first cavity of described hydraulic cylinder, and between described stretching head and the described stretching bar for removably connecting.
7. double-stage hydraulic stretcher according to claim 6 is characterized in that, between described stretching head and the described stretching bar by being threaded.
8. according to each or claim 6 or the described double-stage hydraulic stretcher of claim 7 among the claim 1-4, it is characterized in that described syndeton is the internal thread that cooperates with the external screw thread of described bolt.
9. according to each described double-stage hydraulic stretcher among the claim 2-4, it is characterized in that described first pouring orifice is connected by oil fuel tube with described second pouring orifice, and described oil fuel tube is provided with the oiling joint that at least one is used for oiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320214368 CN203227995U (en) | 2013-04-25 | 2013-04-25 | Double-stage hydraulic stretcher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320214368 CN203227995U (en) | 2013-04-25 | 2013-04-25 | Double-stage hydraulic stretcher |
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| Publication Number | Publication Date |
|---|---|
| CN203227995U true CN203227995U (en) | 2013-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320214368 Expired - Lifetime CN203227995U (en) | 2013-04-25 | 2013-04-25 | Double-stage hydraulic stretcher |
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| CN (1) | CN203227995U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109048314A (en) * | 2018-10-15 | 2018-12-21 | 扬州市神力吊具制造有限公司 | A kind of self-adaptive hydraulic stretcher |
| CN111922690A (en) * | 2020-08-14 | 2020-11-13 | 马鞍山市罗泰特机械制造有限公司 | Spring is from restoring to throne doublestage hydraulic stretcher with meter function |
| CN111922691A (en) * | 2020-08-14 | 2020-11-13 | 马鞍山市罗泰特机械制造有限公司 | Hydraulic bolt stretcher capable of counting |
| CN112045400A (en) * | 2020-08-28 | 2020-12-08 | 三门核电有限公司 | Large-scale shielding main pump main bolt stretching device and stretching method |
-
2013
- 2013-04-25 CN CN 201320214368 patent/CN203227995U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109048314A (en) * | 2018-10-15 | 2018-12-21 | 扬州市神力吊具制造有限公司 | A kind of self-adaptive hydraulic stretcher |
| CN109048314B (en) * | 2018-10-15 | 2024-02-27 | 扬州市神力吊具制造有限公司 | Self-adaptive hydraulic stretcher |
| CN111922690A (en) * | 2020-08-14 | 2020-11-13 | 马鞍山市罗泰特机械制造有限公司 | Spring is from restoring to throne doublestage hydraulic stretcher with meter function |
| CN111922691A (en) * | 2020-08-14 | 2020-11-13 | 马鞍山市罗泰特机械制造有限公司 | Hydraulic bolt stretcher capable of counting |
| CN112045400A (en) * | 2020-08-28 | 2020-12-08 | 三门核电有限公司 | Large-scale shielding main pump main bolt stretching device and stretching method |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131009 |
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| CX01 | Expiry of patent term |