CN205061459U - Center hole jack - Google Patents
Center hole jack Download PDFInfo
- Publication number
- CN205061459U CN205061459U CN201520489350.9U CN201520489350U CN205061459U CN 205061459 U CN205061459 U CN 205061459U CN 201520489350 U CN201520489350 U CN 201520489350U CN 205061459 U CN205061459 U CN 205061459U
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- China
- Prior art keywords
- piston rod
- ring
- urceolus
- centre
- inner core
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Abstract
The utility model discloses a center hole jack, including jack body and displacement sensor, the jack body includes barrel and piston rod, displacement sensor includes outer cylinder base, urceolus and inner tube, is provided with adjustable resistance, grating chi or metal induced magnetic field between inner tube and the urceolus, the barrel includes cylinder, jar seat, mandrel and gland, be provided with the mandrel sealing washer between mandrel and the piston rod, be provided with piston seal between piston rod and the cylinder, the mandrel sealing washer includes that U -type sealing ring and si te seal, piston seal includes that two at least check enclose, go back fixedly connected with retaining ring seat on the free end of urceolus, be provided with the dust -separation retaining ring on the retaining ring seat. The utility model discloses simple structure, sealed reliable, little, the long service life of piston rod movement resistance of hydraulic oil cavity.
Description
Technical field
The utility model relates to construction implement field, particularly relates to a kind of centre-hole jack.
Background technology
Jack is widely used in highway, railway, particularly at the bridge of express highway, high speed railway, steel strand stringing in tunnel slope construction, in the stretching process of steel strand, the pressure of hydraulic oil may reach 60Mpa even more than, the hermetically-sealed construction of piston rod upper piston is larger on the impact of the actuating pressure of jack, running stability, load-carrying capacity, anti-temporary impact and pressure maintaining performance.
For weighing the top lifting height to steel strand in prior art, to reflect the stretch-draw degree of steel strand, jack arranges mechanical displacement sensor with Measurement accuracy piston rod extension elongation.Outside the flexible moving part of the synchronous piston bar of mechanical displacement sensor is chronically exposed to, the easy attachment grains of sand, cause occurring bite phenomenon between inside and outside cylinder, cut appears in the fitting surface of the inside and outside cylinder of sensor in the course of time, causes the too early precise decreasing of displacement pickup or inefficacy.The jack structure applying to the tensioning of building operation steel strand in prior art awaits further optimization.
Summary of the invention
For the hermetically-sealed construction of piston rod, piston in above-mentioned prior art, larger on the impact of the actuating pressure of jack, running stability, load-carrying capacity, anti-temporary impact and pressure maintaining performance, in sensor use procedure inside and outside cylinder fitting surface on easily there is cut, cause the too early precise decreasing of displacement pickup or inefficacy, the jack structure applying to the tensioning of building operation steel strand awaits the problem optimized further, and the utility model provides a kind of centre-hole jack.
For the problems referred to above, a kind of centre-hole jack that the utility model provides solves problem by following technical essential: a kind of centre-hole jack, comprise jack body and be fixed on the displacement pickup on jack body, described jack body comprises cylindrical shell and is arranged on the piston rod in cylindrical shell, institute's displacement sensors comprises outer cylinder base, urceolus and inner core, described outer cylinder base is fixed on cylindrical shell, urceolus is fixed on outer cylinder base, inner core and urceolus free-running fit, variable resistance is provided with between inner core and urceolus, grating scale or metal induced field, inner core is fixing on the piston rod by connecting plate relative to the external part of urceolus, described cylindrical shell comprises and is provided with centre hole and the cylinder barrel of centre hole axis collinear, cylinder seat, axle and gland, described cylinder barrel cylindrically, gland is connected with the threaded one end of cylinder barrel, piston rod is stretched out by the other end of cylinder barrel, cylinder seat is fastened between the piston end of piston rod and gland, one end of axle is fixedly connected with cylinder seat, the other end of axle is positioned at the centre hole of piston rod, and cylinder seat is fixed relative to the position of cylinder barrel axis, described cylinder barrel is also provided with hydraulic oil inlet, described hydraulic oil inlet is between cylinder seat and the piston end of piston rod,
Be provided with axle seal ring between described axle and piston rod, be provided with piston packing ring between piston rod and cylinder barrel, described axle seal ring comprises U-shaped seal ring and Si Te envelope, and described piston packing ring comprises at least two lattice to enclose;
The free end of described urceolus is also fixedly connected with back-up ring seat, described back-up ring seat is provided with dust-separation back-up ring, and the outside face of the inner ring of dust-separation back-up ring and inner core is fitted.
Concrete, the piston rod of the jack body of setting is used for acting as steel strand with steel strand provides stretching force, and the displacement pickup of setting is for measuring the extension elongation of piston rod.In the utility model, by one end of inner core is connected with piston rod by connecting plate, the version of inner core and urceolus free-running fit, in the process that piston rod stretches out, by the effect of connecting plate, inner core synchronous piston bar stretches out from urceolus, and the variable resistance arranged between inner core and urceolus, grating scale or metal induced field are for measuring the extension elongation of inner core relative to urceolus, and finally output numeral or analog signal are to quantize piston rod extension elongation in the course of the work.
In the utility model, axle seal ring comprises U-shaped seal ring and Si Te envelope, the structure design that described piston packing ring comprises at least two lattice to enclose, Si Te envelope is axle Assembled sealer, it is made up of the filled polytetrafluoroethylene cascade ring of a low friction and a rubber elastomer (O shape circle), is coaxial type seal ring; Glais ring is hole combined seal ring, is also enclosed by a wear-resistant filled polytetrafluoroethylene ring and an O shape, composition; U-shaped seal ring performs HG4-336-66 standard, is the hermetically-sealed construction of the main lip and secondary lip with collaborative work.In the process that piston rod moves relative to axle and cylinder barrel, the hermetically-sealed construction of above version is adopted to realize axle and piston rod, sealing between piston rod and cylinder barrel, the resistance due to seal ring production that in piston rod, outside is subject to is little, when making piston rod actuating pressure of the present utility model low, solve the phenomenon that jack applies to the leakage of oil that steel strand tensioning easily occurs, above hermetically-sealed construction be arranged so that the utility model run more steady, higher operation pressure and temporary impact pressure can be carried, actual displacement precision is at 1mm, pressure precision is within 3%, adopt the leakproofing material of suitable material simultaneously, can make the seal form normal workweek phase of above version more than 2 years, be longer than existing centre-hole jack piston rod seal and be generally the trimestral period of inspection and repair.
The dust-separation back-up ring arranged enters between inner core and urceolus for stoping the extraneous grains of sand or other impurity; avoid the fitting surface of the utility model inner core and urceolus in severe working environment occurs cut because of impurity in the process of relative motion, cause the too early precise decreasing of displacement pickup or inefficacy.
Further technical scheme is:
Also comprise spring, the two ends of described spring are fixedly connected with the external part of inner core with one end of connecting plate respectively, and the other end of connecting plate connects on the piston rod.Adopt the version that inner core is connected by spring with connecting plate; when making piston rod produce distortion under external force; in jack body working process; connecting plate causes the smooth or connecting plate distortion of both relative motions relative to piston rod bite; under spring all avoids above two kinds of situations by the distortion of its radial direction, larger external force is passed between inner core and urceolus; to reach both maintenances relative position and the object reducing interaction force between the two, can safeguard bit displacement sensor.
For ensureing the type of attachment of clean and simplification axle and cylinder seat in hydraulic cavities, between described axle and cylinder seat, be also provided with dust ring.
As a kind of simple and can produce the former dust-separation back-up ring so with good dust-separation effect of radial motion at inner core, described dust-separation back-up ring is pad or the hairbrush of ring-type.
As a kind of U-shaped seal ring of long service life, described U-shaped seal ring is the U-shaped seal ring of polyurethane.
For simplifying structure of the present utility model and being convenient to I& M of the present utility model, the end of described piston rod free end is provided with annular groove, the coupling end of described connecting plate and piston rod is split-type structural, and each several part of the split-type structural end of connecting plate forms annular anchor ear, the annular groove place of described piston rod and annular anchor ear free-running fit realize the connection of connecting plate and piston rod.Above structure is simple, processing and manufacturing easy, realizes connecting plate and is connected and convenient separation with piston rod.
Because existing jack body generally makes piston rod bounce back by unloading hydraulic oil, for reducing the resistance of piston rod in retraction process, also comprise retracing spring, one end that one end and the inner core of retracing spring go deep into urceolus is fixedly connected with, and the other end of retracing spring is fixedly connected on urceolus or outer cylinder base.
The utility model has following beneficial effect:
1, the utility model structure is simple, the resistance due to seal ring production that in piston rod, outside is subject to is little, when making piston rod actuating pressure of the present utility model low, solve the phenomenon that jack applies to the leakage of oil that steel strand tensioning easily occurs, above hermetically-sealed construction be arranged so that the utility model run more steady, higher operation pressure and temporary impact pressure can be carried, actual displacement precision is at 1mm, pressure precision is within 3%, adopt the leakproofing material of suitable material simultaneously, can make the seal form normal workweek phase of above version more than 2 years, be longer than existing centre-hole jack piston rod seal and be generally the trimestral period of inspection and repair.
2, the dust-separation back-up ring arranged enters between inner core and urceolus for stoping the extraneous grains of sand or other impurity; avoid the fitting surface of the utility model inner core and urceolus in severe working environment occurs cut because of impurity in the process of relative motion, cause the too early precise decreasing of displacement pickup or inefficacy.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of centre-hole jack described in the utility model specific embodiment;
Fig. 2 is in a kind of centre-hole jack described in the utility model specific embodiment, the front view of connecting plate.
Figure acceptance of the bid note is respectively: 1, gland, and 2, cylinder seat, 3, cylinder barrel, 4, piston rod, 41, axle seal ring, 42, axle, 43, piston packing ring, 44, dust ring, 5, connecting plate, 51, annular anchor ear, 6, spring, 7, dust-separation back-up ring, 8, back-up ring seat, 9, inner core, 10, urceolus, 11, outer cylinder base, 12, retracing spring.
Detailed description of the invention
Below in conjunction with embodiment, the utility model is described in further detail, but structure of the present utility model is not limited only to following examples:
Embodiment 1:
As depicted in figs. 1 and 2, a kind of centre-hole jack, comprise jack body and be fixed on the displacement pickup on jack body, described jack body comprises cylindrical shell and is arranged on the piston rod 4 in cylindrical shell, institute's displacement sensors comprises outer cylinder base 11, urceolus 10 and inner core 9, described outer cylinder base 11 is fixed on cylindrical shell, urceolus 10 is fixed on outer cylinder base 11, inner core 9 and urceolus 10 free-running fit, variable resistance is provided with between inner core 9 and urceolus 10, grating scale or metal induced field, inner core 9 is fixed on piston rod 4 relative to the external part of urceolus 10 by connecting plate 5, described cylindrical shell comprises and is provided with centre hole and the cylinder barrel 3 of centre hole axis collinear, cylinder seat 2, axle 42 and gland 1, described cylinder barrel 3 cylindrically, gland 1 is connected with the threaded one end of cylinder barrel 3, piston rod 4 is stretched out by the other end of cylinder barrel 3, cylinder seat 2 is fastened between the piston end of piston rod 4 and gland 1, one end of axle 42 is fixedly connected with cylinder seat 2, the other end of axle 42 is positioned at the centre hole of piston rod 4, and cylinder seat 2 is fixed relative to the position of cylinder barrel 3 axis, described cylinder barrel 3 is also provided with hydraulic oil inlet, described hydraulic oil inlet is between cylinder seat 2 and the piston end of piston rod 4,
Be provided with axle seal ring 41 between described axle 42 and piston rod 4, be provided with piston packing ring 43 between piston rod 4 and cylinder barrel 3, described axle seal ring 41 comprises U-shaped seal ring and Si Te envelope, and described piston packing ring 43 comprises at least two lattice to enclose;
The free end of described urceolus 10 is also fixedly connected with back-up ring seat 8, described back-up ring seat 8 is provided with dust-separation back-up ring 7, and the outside face of the inner ring of dust-separation back-up ring 7 and inner core 9 is fitted.
In the present embodiment, the piston rod 4 of the jack body of setting provides stretching force for acting as steel strand with steel strand, and the displacement pickup of setting is for measuring the extension elongation of piston rod 4.In the utility model, by one end of inner core 9 is connected with piston rod 4 by connecting plate 5, the version of inner core 9 and urceolus 10 free-running fit, in the process that piston rod 4 stretches out, by the effect of connecting plate 5, inner core 9 synchronous piston bar 4 stretches out from urceolus 10, the variable resistance arranged between inner core 9 and urceolus 10, grating scale or metal induced field are for measuring the extension elongation of inner core 9 relative to urceolus 10, and finally output numeral or analog signal are to quantize piston rod 4 extension elongation in the course of the work.
In the present embodiment, axle seal ring 41 comprises U-shaped seal ring and Si Te envelope, the structure design that described piston packing ring 43 comprises at least two lattice to enclose, Si Te envelope is axle Assembled sealer, it is made up of the filled polytetrafluoroethylene cascade ring of a low friction and a rubber elastomer (O shape circle), is coaxial type seal ring; Glais ring is hole combined seal ring, is also enclosed by a wear-resistant filled polytetrafluoroethylene ring and an O shape, composition; U-shaped seal ring performs HG4-336-66 standard, is the hermetically-sealed construction of the main lip and secondary lip with collaborative work.In the process that piston rod 4 moves relative to axle 42 and cylinder barrel 3, the hermetically-sealed construction of above version is adopted to realize axle 42 and piston rod 4, sealing between piston rod 4 and cylinder barrel 3, the resistance due to seal ring production that in piston rod 4, outside is subject to is little, when making piston rod 4 actuating pressure of the present utility model low, solve the phenomenon that jack applies to the leakage of oil that steel strand tensioning easily occurs, above hermetically-sealed construction be arranged so that the utility model run more steady, higher operation pressure and temporary impact pressure can be carried, actual displacement precision is at 1mm, pressure precision is within 3%, adopt the leakproofing material of suitable material simultaneously, can make the seal form normal workweek phase of above version more than 2 years, be longer than existing centre-hole jack piston rod 4 hermetically-sealed construction and be generally the trimestral period of inspection and repair.
The dust-separation back-up ring 7 arranged enters between inner core 9 and urceolus 10 for stoping the extraneous grains of sand or other impurity; avoid the fitting surface of the utility model inner core 9 and urceolus 10 in severe working environment occurs cut because of impurity in the process of relative motion, cause the too early precise decreasing of displacement pickup or inefficacy.
In the present embodiment, axle seal ring 41 and piston packing ring 43 are embedded in the inside and outside both sides of piston rod 4 respectively, to move with piston rod 4 in piston rod 4 motion process.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1, as shown in Figure 1, also comprises spring 6, and the two ends of described spring 6 are fixedly connected with the external part of inner core 9 with one end of connecting plate 5 respectively, and the other end of connecting plate 5 is connected on piston rod 4.Adopt the version that inner core 9 is connected by spring 6 with connecting plate 5; when making piston rod 4 produce distortion under external force; in jack body working process; connecting plate 5 causes the smooth or connecting plate 5 of both relative motions to be out of shape relative to piston rod 4 bite; under spring 6 all avoids above two kinds of situations by the distortion of its radial direction, larger external force is passed between inner core 9 and urceolus 10; to reach both maintenances relative position and the object reducing interaction force between the two, can safeguard bit displacement sensor.
Embodiment 3:
The present embodiment is further qualified on the basis of embodiment 1, as shown in Figure 1, for ensureing the type of attachment of clean and simplification axle 42 and cylinder seat 2 in hydraulic cavities, is also provided with dust ring 44 between described axle 42 and cylinder seat 2.
As a kind of simple and can produce the former dust-separation back-up ring 7 so with good dust-separation effect of radial motion at inner core 9, described dust-separation back-up ring 7 is pad or the hairbrush of ring-type.
As a kind of U-shaped seal ring of long service life, described U-shaped seal ring is the U-shaped seal ring of polyurethane.
Embodiment 4:
The present embodiment is further qualified on the basis of embodiment 1, as depicted in figs. 1 and 2, for simplifying structure of the present utility model and being convenient to I& M of the present utility model, the end of described piston rod 4 free end is provided with annular groove, described connecting plate 5 is split-type structural with the coupling end of piston rod 4, and each several part of the split-type structural end of connecting plate 5 forms annular anchor ear 51, the annular groove place of described piston rod 4 and annular anchor ear 51 free-running fit realize the connection of connecting plate 5 and piston rod 4.Above structure is simple, processing and manufacturing easy, realizes connecting plate 5 and is connected and convenient separation with piston rod 4.
Embodiment 5:
The present embodiment is further qualified on the basis of embodiment 1, as shown in Figure 1, because existing jack body generally makes piston rod 4 bounce back by unloading hydraulic oil, for reducing the resistance of piston rod 4 in retraction process, also comprise retracing spring 12, one end that one end and the inner core 9 of retracing spring 12 go deep into urceolus 10 is fixedly connected with, and the other end of retracing spring 12 is fixedly connected on urceolus 10 or outer cylinder base 11.
Above content is the further description done the utility model in conjunction with concrete preferred implementation, can not assert that detailed description of the invention of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, not departing from other embodiments drawn under the technical solution of the utility model, all should be included in protection domain of the present utility model.
Claims (7)
1. a centre-hole jack, comprise jack body and be fixed on the displacement pickup on jack body, described jack body comprises cylindrical shell and is arranged on the piston rod (4) in cylindrical shell, institute's displacement sensors comprises outer cylinder base (11), urceolus (10) and inner core (9), described outer cylinder base (11) is fixed on cylindrical shell, urceolus (10) is fixed on outer cylinder base (11), inner core (9) and urceolus (10) free-running fit, variable resistance is provided with between inner core (9) and urceolus (10), grating scale or metal induced field, inner core (9) is fixed on piston rod (4) relative to the external part of urceolus (10) by connecting plate (5), it is characterized in that, described cylindrical shell comprises and is provided with centre hole and the cylinder barrel (3) of centre hole axis collinear, cylinder seat (2), axle (42) and gland (1), described cylinder barrel (3) cylindrically, gland (1) is connected with the threaded one end of cylinder barrel (3), piston rod (4) is stretched out by the other end of cylinder barrel (3), cylinder seat (2) is fastened between the piston end of piston rod (4) and gland (1), one end of axle (42) is fixedly connected with cylinder seat (2), the other end of axle (42) is positioned at the centre hole of piston rod (4), and cylinder seat (2) position axial relative to cylinder barrel (3) is fixed, (3) are also provided with hydraulic oil inlet to described cylinder barrel, described hydraulic oil inlet is positioned between the piston end of cylinder seat (2) and piston rod (4),
Axle seal ring (41) is provided with between described axle (42) and piston rod (4), piston packing ring (43) is provided with between piston rod (4) and cylinder barrel (3), described axle seal ring (41) comprises U-shaped seal ring and Si Te envelope, and described piston packing ring (43) comprises at least two lattice to enclose;
The free end of described urceolus (10) is also fixedly connected with back-up ring seat (8), described back-up ring seat (8) is provided with dust-separation back-up ring (7), and the outside face of the inner ring of dust-separation back-up ring (7) and inner core (9) is fitted.
2. a kind of centre-hole jack according to claim 1, it is characterized in that, also comprise spring (6), the two ends of described spring (6) are fixedly connected with the external part of inner core (9) with one end of connecting plate (5) respectively, and the other end of connecting plate (5) is connected on piston rod (4).
3. a kind of centre-hole jack according to claim 1, is characterized in that, is also provided with dust ring (44) between described axle (42) and cylinder seat (2).
4. a kind of centre-hole jack according to claim 1, is characterized in that, the pad that described dust-separation back-up ring (7) is ring-type or hairbrush.
5. a kind of centre-hole jack according to claim 1, is characterized in that, described U-shaped seal ring is the U-shaped seal ring of polyurethane.
6. a kind of centre-hole jack according to claim 1, it is characterized in that, the end of described piston rod (4) free end is provided with annular groove, described connecting plate (5) is split-type structural with the coupling end of piston rod (4), and each several part of the split-type structural end of connecting plate (5) forms annular anchor ear (51), the annular groove place of described piston rod (4) and annular anchor ear (51) free-running fit realize the connection of connecting plate (5) and piston rod (4).
7. a kind of centre-hole jack according to claim 1, it is characterized in that, also comprise retracing spring (12), one end that one end and the inner core (9) of retracing spring (12) go deep into urceolus (10) is fixedly connected with, and the other end of retracing spring (12) is fixedly connected on urceolus (10) or outer cylinder base (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520489350.9U CN205061459U (en) | 2015-07-09 | 2015-07-09 | Center hole jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520489350.9U CN205061459U (en) | 2015-07-09 | 2015-07-09 | Center hole jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205061459U true CN205061459U (en) | 2016-03-02 |
Family
ID=55388040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520489350.9U Expired - Fee Related CN205061459U (en) | 2015-07-09 | 2015-07-09 | Center hole jack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205061459U (en) |
-
2015
- 2015-07-09 CN CN201520489350.9U patent/CN205061459U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20210709 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |