CN209740589U

CN209740589U - Hollow double-acting oil jack

Info

Publication number: CN209740589U
Application number: CN201920432019.1U
Authority: CN
Inventors: 杨佩红; 刘江河
Original assignee: NINGBO SAIVS MACHINERY CO Ltd
Current assignee: NINGBO SAIVS MACHINERY CO Ltd
Priority date: 2019-04-01
Filing date: 2019-04-01
Publication date: 2019-12-06
Anticipated expiration: 2029-04-01

Abstract

The utility model discloses a two effect hydraulic jack of cavity aims at providing the hydraulic jack that difficult wearing and tearing, leakproofness are good and life is high, and its technical scheme main points are including hydro-cylinder, hollow tube and piston rod, hollow tube one end is installed on the hydro-cylinder seat surface of hydro-cylinder bottom, and the hollow tube other end runs through the hydro-cylinder seat and extends to hydro-cylinder inner chamber, the piston rod axial slides and installs between hollow tube and hydro-cylinder, be provided with the confession between hollow tube and the piston rod the clearance of hollow tube towards the radial offset of piston rod, the guide ring that is used for the guide piston rod is installed to the hydro-cylinder upper end, be provided with the confession between guide ring and the hydro-cylinder the piston rod is towards the clearance of the radial offset of hydro-cylinder.

Description

Hollow double-acting oil jack

Technical Field

The utility model relates to a jack technical field more exactly relates to a two effect hydraulic jack of cavity.

Background

The jack is a common pre-lifting device in industrial production processes or machine manufacturing, and the sealing performance of a sealing part of the jack is directly related to whether the jack can work normally or not. The jacking and the off-load of jack usually are accomplished through piston rod reciprocating in the hydro-cylinder inner wall, the piston promotes the piston rod and rises the load, in the process of rising, the piston rod easily takes place radial offset because the load is great, and current jack is because the hollow tube adopts fixed structural design usually, lacks the clearance of offsetting the piston rod skew, at the in-process that the piston rod removed, the piston rod directly offsets with hollow tube or hydro-cylinder inner wall, easily arouse piston rod, hollow tube and hydro-cylinder inner wall wearing and tearing, lead to the leakproofness decline in the past, the problem of life reduction.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide an oil jack that difficult wearing and tearing, leakproofness are good and life is high.

The technical solution of the utility model is that, a two effect hydraulic jack of cavity with following structure is provided, including hydro-cylinder, hollow tube and piston rod, hollow tube one end is installed on the hydro-cylinder seat surface of hydro-cylinder bottom, and the hollow tube other end runs through the hydro-cylinder seat and extends to hydro-cylinder inner chamber, the piston rod axial slides and installs between hollow tube and hydro-cylinder, be equipped with the dog that is used for separating into process oil pocket and return oil pocket with the hydro-cylinder oil circuit on the piston rod, install the guide unit who is used for the guide piston pole on the dog, be provided with the confession between hollow tube and the piston rod the clearance of hollow tube radial offset towards the piston rod, the guide ring that is used for the guide piston pole is installed to the hydro-cylinder upper end, be provided with the conf.

After the structure above adopting, the utility model discloses a two effect hydraulic jack of cavity compares with prior art, has following advantage: a gap (a: 0.1 mm-0.5 mm) for radially offsetting the hollow pipe towards the piston rod by a certain amount of a is formed between the hollow pipe and the piston rod, the guide ring has a movement trend (b: 0.45 mm-1.8 mm) for radially offsetting the hollow pipe towards the oil cylinder by a certain amount of b, and the guide ring and the oil cylinder are combined to enable the piston rod to generate proper radial offset in the sliding process along the hollow pipe, so that the abrasion among the piston rod, the hollow pipe and the oil cylinder is reduced, and the service lives of the oil cylinder, the hollow pipe and the piston rod.

As an improvement of the utility model, hollow tube bottom integrated into one piece has the fender shoulder, keep off the shoulder along the radial setting of hollow tube week side, seted up on the hydro-cylinder seat and kept off shoulder matched with clearance groove, the clearance groove is provided with the confession keep off the clearance of the radial offset of shoulder, still install in the clearance groove and keep off the circlip that shoulder bottom terminal surface offseted. The clearance groove is provided with a certain amount of clearance d (d: 0.25 mm-1 mm) for radial deviation of the retaining shoulder towards the oil cylinder seat, so that the hollow pipe can obtain certain radial deviation, and the radial deviation generated in the sliding process of the piston rod along the hollow pipe can be properly offset by the clearance; the upper end face of the elastic check ring is abutted to the end face of the bottom of the outer side of the retaining shoulder, so that the hollow pipe is axially limited, and the hollow pipe can be conveniently aligned in a deviation manner.

As an improvement of the utility model, the shoulder hole has been seted up to the hydro-cylinder upper end, the guide ring is installed in the shoulder hole, the guide ring week side be provided with shoulder hole matched with flange, be formed with the confession between flange and the hydro-cylinder inner wall the piston rod has the clearance of radial offset. The flange matched with the stepped hole is arranged on the guide ring, and a certain amount of b clearance (b: 0.45 mm-1.8 mm) is radially offset between the flange and the inner wall of the oil cylinder, so that the guide ring has the offset tendency towards the oil cylinder, and the piston rod can be offset towards the oil cylinder.

As an improvement of the utility model, still install screw thread protective sheath and direction lid on the hydro-cylinder of shoulder hole upper end, the screw thread protective sheath is installed in the hydro-cylinder outside, the direction lid cover is established between piston rod and hydro-cylinder, and the bottom terminal surface of direction lid tightly supports the terminal surface that is close to flange one side on the guide ring, the internal diameter of direction lid is greater than the external diameter of piston rod. The thread protective sleeve improves the structural strength of the device, and a movement trend (c: 0.25 mm-1 mm) for radially offsetting the piston rod towards the guide cover by a certain amount c is arranged between the guide cover and the piston rod.

As an improvement of the utility model, the notch has all been seted up to the dog inboard and direction lid inboard, install the dustproof packing ring in the notch. Inside the dustproof gasket on direction lid and the dog effectively isolated impurity such as dust got into the hydro-cylinder, the two combines to avoid hydraulic medium to receive the pollution in the hydro-cylinder, promoted the jacking precision of hydro-cylinder.

As an improvement of the utility model, a top plate is fixed on the upper end of the piston rod.

As an improvement of the utility model, the guide unit includes preceding inner guide sleeve and the back inner guide sleeve that set up between dog and hollow tube and sets up preceding outer guide sleeve and the back outer guide sleeve between dog and hydro-cylinder.

As an improvement of the utility model, all install sealing washer and retaining ring between preceding inner guide cover and the back inner guide cover, between preceding outer guide cover and the back outer guide cover, the dog inboard is installed and is used for the interior semi-ring that the inner guide cover slided in the restriction before and back inner guide cover axial, and still installs the outer semi-ring that is used for the restriction before outer guide cover and the back outer guide cover axial to slide outside the dog. The sealing ring and the check ring between the front inner guide sleeve and the rear inner guide sleeve and the sealing ring and the check ring between the front outer guide sleeve and the rear outer guide sleeve improve the sealing performance between the process oil cavity and the return oil cavity; the inner half ring and the outer half ring improve the degree of stability of the guide unit mounted on the stopper.

As an improvement of the utility model, the hydro-cylinder upper end is provided with the return stroke oil feed joint with return stroke oil pocket intercommunication, and the hydro-cylinder lower extreme is provided with the process oil feed joint with process oil pocket intercommunication. The hydraulic reset is adopted, and the service life is prolonged by multiple times compared with the reset of a common spring.

As an improvement of the utility model, the solenoid valve that is used for switching the oil circuit is installed respectively to return stroke oil feed joint and process oil feed joint.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged schematic view of a structure in fig. 1 according to the present invention.

Fig. 3 is an enlarged schematic view of the structure at B in fig. 1 according to the present invention.

FIG. 4 is an enlarged schematic view of the structure at C in FIG. 1 of the present invention

Fig. 5 is a front view of the present invention.

Shown in the figure: the oil cylinder comprises an oil cylinder 1, an oil cylinder seat 11, a 111 clearance groove, a thread protection sleeve 13, a hollow tube 2, a retaining shoulder 21, a piston rod 3, a stop dog 31, an inner half ring 311, an outer half ring 312, a top disc 32, a guide unit 4, a front inner guide sleeve 41, a rear inner guide sleeve 42, a front outer guide sleeve 43, a rear outer guide sleeve 44, a guide ring 5, a flange 51, a guide cover 6, a dustproof gasket 7, a return oil inlet joint 8, a process oil inlet joint 9 and an electromagnetic valve 10.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

Referring to fig. 1, 2, 3, 4 and 5, the hollow double-acting hydraulic jack of the present invention comprises an oil cylinder 1, a hollow tube 2 and a piston rod 3, wherein one end of the hollow tube 2 is mounted on the surface of an oil cylinder seat 11 at the bottom end of the oil cylinder 1, the other end of the hollow tube 2 penetrates through the oil cylinder base 11 and extends to the inner cavity of the oil cylinder 1, the piston rod 3 is axially installed between the hollow tube 2 and the oil cylinder 1 in a sliding manner, the piston rod 3 is provided with a stop block 31 which is used for dividing the oil path of the oil cylinder 1 into a process oil cavity and a return oil cavity, the stopper 31 is provided with a guide unit 4 for guiding the piston rod 3, a gap for radial offset of the hollow tube 2 towards the piston rod 3 is arranged between the hollow tube 2 and the piston rod 3, the piston rod 3 is characterized in that a guide ring 5 used for guiding the piston rod 3 is installed at the upper end of the oil cylinder 1, and a gap for guiding the piston rod 3 to move towards the radial offset of the oil cylinder 1 is formed between the guide ring 5 and the oil cylinder 1.

The bottom end of the hollow tube 2 is integrally formed with a retaining shoulder 21, the retaining shoulder 21 is radially arranged on the periphery of the hollow tube 2 along the hollow tube 2, the cylinder block 11 is provided with a clearance groove 111 matched with the retaining shoulder 21, the clearance groove 111 is provided with a clearance for radial offset of the retaining shoulder 21, and an elastic check ring which is abutted against the end face of the bottom of the retaining shoulder 21 is further arranged in the clearance groove 111. The shoulder hole has been seted up to 1 upper end of hydro-cylinder, 5 install in the shoulder hole of uide ring, 5 week sides of uide ring are provided with shoulder hole matched with flange 51, be formed with the confession between flange 51 and the 1 inner wall of hydro-cylinder 3 has the clearance of radial offset. Still install screw thread protective sheath 13 and direction lid 6 on the hydro-cylinder 1 of shoulder hole upper end, screw thread protective sheath 13 is installed in the hydro-cylinder 1 outside, the cover is established between piston rod 3 and hydro-cylinder 1 to direction lid 6, and the bottom terminal surface of direction lid 6 supports the terminal surface that is close to flange 51 one side tightly on guide ring 5, the internal diameter of direction lid 6 is greater than the external diameter of piston rod 3. The inboard notch of all having seted up of dog 31 and direction lid 6 inboard, install dust washer 7 in the notch. The upper end of the piston rod 3 is fixedly provided with a top disc 32. The guide unit 4 includes a front inner guide sleeve 41 and a rear inner guide sleeve 42 disposed between the stopper 31 and the hollow tube 2, and a front outer guide sleeve 43 and a rear outer guide sleeve 44 disposed between the stopper 31 and the cylinder 1. Sealing rings and retaining rings are respectively arranged between the front inner guide sleeve 41 and the rear inner guide sleeve 42 and between the front outer guide sleeve 43 and the rear outer guide sleeve 44, an inner half ring 311 used for limiting the axial sliding of the front inner guide sleeve 41 and the rear inner guide sleeve 42 is arranged on the inner side of the stop block 31, and an outer half ring 312 used for limiting the axial sliding of the front outer guide sleeve 43 and the rear outer guide sleeve 44 is also arranged on the outer side of the stop block 31. And the upper end of the oil cylinder 1 is provided with a return oil inlet joint 8 communicated with the return oil cavity, and the lower end of the oil cylinder 1 is provided with a process oil inlet joint 9 communicated with the process oil cavity. And the return oil inlet joint 8 and the progress oil inlet joint 9 are respectively provided with an electromagnetic valve 10 for opening and closing an oil way.

The working principle is as follows: during installation, an operator firstly fixes the oil cylinder base 11 in the installation hole at the bottom of the oil cylinder 1, further, the operator inserts the hollow tube 2 along the oil cylinder base 11 and extends to the inner cavity of the oil cylinder 1, the tail end of the hollow tube 2 is connected with the oil cylinder base 11, a sealing structure is installed between the hollow tube 2 and the oil cylinder base 11, further, the operator installs an elastic retainer ring matched with the retaining shoulder 21 at the bottom of the hollow tube 2 on the oil cylinder base 11, further, the operator inserts the piston rod 3 along the stepped hole at the upper end of the oil cylinder 1, installs the piston rod between the hollow tube 2 and the oil cylinder 1 and enables the stop block 31 and the oil cylinder base 11 to be correspondingly arranged (the inner diameter of the piston rod 3 is larger than the outer diameter of the hollow tube 2 and the outer diameter of the stop block 31 is smaller than the inner, a dustproof gasket 7 (arranged in a groove of a stop block 31 at the upper end of the guide unit 4) and a sealing ring and a check ring for sealing a process oil cavity oil way, a return oil cavity oil way and the check ring; further, a worker firstly installs a guide ring 5 in a stepped hole between the piston rod 3 and the oil cylinder 1, a seal ring for sealing a return oil cavity oil way is installed on the guide ring 5, the guide ring 5 is matched with the outer peripheral surface of the piston rod 3 to support the radial offset of the piston rod 3 and limit the piston rod 3; further, install direction lid 6 at guide ring 5 upper end, the inboard of direction lid 6 is provided with dust washer 7, and finally, the staff installs screw thread protective sheath 13 in hydro-cylinder 1 upper end and between screw thread protective sheath 13 and direction lid 6 the installation pin can. The dustproof gasket 7 on the direction lid 6 and the dog 31 all adopts J-shaped dustproof gasket 7, the impurity such as effectively isolated dust of the J-shaped dustproof gasket 7 that sets up between dog 31 and hollow tube 2 gets into from between hollow tube 2 and dog 31, the impurity such as effectively isolated dust of the J-shaped dustproof gasket 7 that sets up between direction lid 6 and piston rod 3 gets into from between direction lid 6 and the piston rod 3, hydraulic medium pollution in the hydro-cylinder 1 is avoided in the two combination, promote the jacking precision of hydro-cylinder 1. When the hydraulic lifting device is used, a worker respectively connects the electromagnetic valves 10 of the return oil inlet joint 8 and the progress oil inlet joint 9 with a hydraulic pump station, when a load is inserted on the surface of the top plate 32, the worker opens the conduction between the electromagnetic valves 10 on the return oil inlet joint 8 and the progress oil inlet joint 9 and the hydraulic pump station, and injects a hydraulic medium into the progress oil inlet joint 9 through the hydraulic pump station, the hydraulic medium is injected into a progress oil cavity along the progress oil inlet joint 9 to increase the pressure between the bottom end face of the stopper 31 and the oil cylinder seat 11, between the hollow tube 2 and the oil cylinder 1, the piston rod 3 slides upwards in the axial direction between the hollow tube 2 and the oil cylinder 1 under the action of the guide unit 4, the hydraulic medium in the return oil cavity returns to the hydraulic pump station along the return oil inlet joint 8 and the electromagnetic valves 10 at the return oil inlet joint 8, the top plate 32 at the top of the piston, the piston rod 3 is easy to deviate in the radial direction; the cylinder base 11 enables the hollow tube 2 to have a movement trend which deviates a certain amount d in the radial direction of the cylinder base 11 and is matched with the movement trend which is deviated a certain amount b in the radial direction of the cylinder 1 of the flange 51 on the guide ring 5, the piston rod 3 has a movement trend which deviates a certain amount c in the radial direction of the guide cover 6, meanwhile, a gap (a: 0.1 mm-0.5 mm, b: 0.45 mm-1.8 mm, c: 0.25 mm-1 mm and d: 0.25 mm-1 mm) which enables the hollow tube 2 to deviate a certain amount a in the radial direction of the piston rod 3 is formed between the hollow tube 2 and the piston rod 3, the radial deviation generated in the sliding process of the piston rod 3 along the hollow tube 2 can be properly offset by the gap, the abrasion between the piston rod 3 and the hollow tube 2 and the cylinder 1 is reduced, and the service lives of the cylinder 1. When the top plate 32 needs to fall back, the worker stops the hydraulic pump station to inject the hydraulic medium into the in-process oil inlet joint 9, and the load on the top plate 32 enables the hydraulic medium in the in-process oil cavity to return into the hydraulic pump station along the in-process oil inlet joint 9. When the piston rod 3 slides to the installation end of the hollow tube 2, the hollow tube 2 coincides with the center line of the piston rod 3, the central tube 2 and the piston rod 3 lose the deviation condition, the hollow tube 2 and the piston rod 3 are gradually aligned, and the normal operation of the interference device is avoided. The device adopts hydraulic reset, and the service life is prolonged by multiple times compared with that of the common spring reset.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a two effect hydraulic jack of cavity, includes hydro-cylinder (1), hollow tube (2) and piston rod (3), hollow tube (2) one end is installed on hydro-cylinder seat (11) surface of hydro-cylinder (1) bottom, and hollow tube (2) other end runs through hydro-cylinder seat (11) and extends to hydro-cylinder (1) inner chamber, piston rod (3) axial slides and installs between hollow tube (2) and hydro-cylinder (1), be equipped with dog (31) that are used for separating into process oil pocket and return stroke oil pocket with hydro-cylinder (1) oil circuit on piston rod (3), install guide unit (4) that are used for guide piston rod (3) on dog (31), its characterized in that: a gap for guiding the radial offset of the hollow tube (2) towards the piston rod (3) is arranged between the hollow tube (2) and the piston rod (3), a guide ring (5) for guiding the piston rod (3) is installed at the upper end of the oil cylinder (1), and a gap for guiding the radial offset of the piston rod (3) towards the oil cylinder (1) is arranged between the guide ring (5) and the oil cylinder (1).

2. A hollow double acting hydraulic jack as claimed in claim 1, wherein: hollow tube (2) bottom integrated into one piece has fender shoulder (21), keep off shoulder (21) and radially set up in hollow tube (2) week side along hollow tube (2), seted up on cylinder block (11) and keep off shoulder (21) matched with clearance groove (111), clearance groove (111) are provided with the confession keep off the clearance of shoulder (21) radial offset, still install in clearance groove (111) and keep off the circlip that shoulder (21) bottom terminal surface offseted.

3. A hollow double acting hydraulic jack as claimed in claim 1, wherein: the shoulder hole has been seted up to hydro-cylinder (1) upper end, install in the shoulder hole guide ring (5), guide ring (5) week side is provided with flange (51) with shoulder hole complex, be formed with the confession between flange (51) and hydro-cylinder (1) inner wall piston rod (3) have the clearance of radial offset.

4. A hollow double acting hydraulic jack according to claim 3, wherein: still install screw thread protective sheath (13) and direction lid (6) on hydro-cylinder (1) of shoulder hole upper end, install in the hydro-cylinder (1) outside screw thread protective sheath (13), direction lid (6) cover is established between piston rod (3) and hydro-cylinder (1), and the bottom terminal surface of direction lid (6) supports the terminal surface that is close to flange (51) one side tightly on guide ring (5), the internal diameter of direction lid (6) is greater than the external diameter of piston rod (3).

5. A hollow double acting hydraulic jack according to claim 4, wherein: the inboard and the direction lid (6) inboard notch of all having seted up of dog (31), install dust washer (7) in the notch.

6. A hollow double acting hydraulic jack as claimed in claim 1, wherein: the upper end of the piston rod (3) is fixedly provided with a top disc (32).

7. A hollow double acting hydraulic jack as claimed in claim 1, wherein: the guide unit (4) comprises a front inner guide sleeve (41) and a rear inner guide sleeve (42) which are arranged between the stop block (31) and the hollow pipe (2), and a front outer guide sleeve (43) and a rear outer guide sleeve (44) which are arranged between the stop block (31) and the oil cylinder (1).

8. A hollow double acting hydraulic jack according to claim 7, wherein: sealing rings and retaining rings are respectively arranged between the front inner guide sleeve (41) and the rear inner guide sleeve (42) and between the front outer guide sleeve (43) and the rear outer guide sleeve (44), an inner half ring (311) used for limiting the axial sliding of the front inner guide sleeve (41) and the rear inner guide sleeve (42) is arranged on the inner side of the stop block (31), and an outer half ring (312) used for limiting the axial sliding of the front outer guide sleeve (43) and the rear outer guide sleeve (44) is further arranged on the outer side of the stop block (31).

9. A hollow double acting hydraulic jack as claimed in claim 1, wherein: the upper end of the oil cylinder (1) is provided with a return oil inlet joint (8) communicated with the return oil cavity, and the lower end of the oil cylinder (1) is provided with a process oil inlet joint (9) communicated with the process oil cavity.

10. A hollow double acting hydraulic jack as claimed in claim 9, wherein: and the return oil inlet joint (8) and the progress oil inlet joint (9) are respectively provided with an electromagnetic valve (10) for opening and closing an oil way.