CN211219782U

CN211219782U - Hydraulic self-centering expansion shaft

Info

Publication number: CN211219782U
Application number: CN201922007849.2U
Authority: CN
Inventors: 迟德林
Original assignee: Ma'anshan Oulin Machinery Equipment Co ltd
Current assignee: Ma'anshan Oulin Machinery Equipment Co ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-08-11
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses a hydraulic self-centering expansion shaft, which comprises an outer sleeve and an inner shaft, wherein the outer sleeve is coaxially connected with the inner shaft, the outer sleeve consists of a check ring, a clamping surface and a connecting base, and the joint of the check ring and the clamping surface and the joint of the clamping surface and the connecting base form inward blocking edges; the inner shaft comprises a shaft body and a bottom connecting seat, the shaft body, a clamping surface and a blocking edge are enclosed to form a hydraulic oil cavity, two oil injection pressurizing holes are symmetrically arranged in the center of the top of the inner shaft, a circulation groove is transversely communicated with the bottom of each oil injection pressurizing hole, the other end of each circulation groove is communicated with the hydraulic oil cavity after penetrating through the outer surface of the shaft body, and the opening part of each oil injection pressurizing hole is sealed by a sealing plug. When the hydraulic clamping device is used, the effect of expanding the clamping surface can be achieved by increasing the pressure of the hydraulic oil through pressurization, the expansion time is short, and the operation efficiency is high; the hydraulic expansion shaft is simple in structure, convenient and easy to maintain, and meanwhile, the service life of the mandrel is prolonged.

Description

Hydraulic self-centering expansion shaft

Technical Field

The utility model relates to the technical field of machining, especially, relate to a hydraulic pressure is from centering inflation axle.

Background

The expansion shaft as an important precise part for mechanical manufacturing and industrial production occupies an important position in many fields such as printing equipment, gear production, measuring tools and the like, and simultaneously shows a plurality of remarkable advantages in practical application.

At present more common inflation axle is the inflatable axle, the inflatable axle need to inwards rush into a certain amount of compressed air and make the expanded key on inflatable axle surface carry out the effect that the work piece was centering to the bloated key that rises to reach inside at the during operation, the work energy consumption of this kind of inflation axle is great, it is higher to the atmospheric pressure requirement of ventilating, operating time is long, and in case take place to leak gas and just make whole equipment production instability at the during operation easily, and the inner structure of this kind of inflation axle is comparatively complicated, neither do benefit to the maintenance, life also can shorten.

Disclosure of Invention

In order to solve the problem, the utility model provides a hydraulic pressure is from centering inflation axle reaches the effect that the clamping face expanded through pressurizing hydraulic oil, and the inflation time is short, and assembly structure is simple, easy to maintain maintenance.

In order to realize the technical purpose, the technical effect is achieved, the utility model discloses a realize through following technical scheme: a hydraulic self-centering expansion shaft comprises an outer sleeve and an inner shaft, wherein the outer sleeve is coaxially connected with the inner shaft, the outer sleeve consists of a check ring, a clamping surface and a connecting base, and inward blocking edges are formed at the joint of the check ring and the inner part of the clamping surface and the joint of the clamping surface and the inner part of the connecting base; the inner shaft comprises a shaft body and a bottom connecting seat, the shaft body, a clamping surface and a blocking edge are enclosed to form a hydraulic oil cavity, hydraulic oil is filled into the hydraulic oil cavity, two oil injection pressurizing holes are symmetrically arranged in the center of the top of the inner shaft, a circulation groove is transversely communicated with the bottom of each oil injection pressurizing hole, the other end of the circulation groove is communicated with the hydraulic oil cavity after penetrating through the outer surface of the shaft body, and the opening part of each oil injection pressurizing hole is sealed by a sealing plug.

The oil injection pressurizing hole comprises a screwing movable hole communicated with the outside and a hydraulic movable hole arranged in the oil injection pressurizing hole and communicated with the oil injection pressurizing hole, a top tightening screw, a sealing iron core and a rubber sealing core are sequentially arranged in the screwing movable hole from top to bottom, and the top tightening screw is in threaded connection with the screwing movable hole.

The connecting base is provided with a plurality of connecting holes penetrating through the upper surface and the lower surface of the connecting base at the periphery, the bottom connecting seat is provided with a plurality of connecting through holes at the periphery corresponding to the connecting holes, and the connecting holes are fixedly connected with the connecting through holes through bolts.

Two sealing ring assembling grooves are respectively arranged on the outer ring surface of the shaft body corresponding to the retainer ring and the connecting base, and sealing rings are assembled in the sealing ring assembling grooves.

The center positions of the top and the bottom of the shaft body are respectively provided with a center hole.

And a connecting thread is arranged on the outer ring surface of the top of the shaft body, which is higher than the retainer ring.

The retainer ring, the clamping surface and the connecting base which form the outer sleeve are integrally formed workpieces, and the shaft body and the bottom connecting seat which form the inner shaft are also integrally formed workpieces.

The utility model has the advantages that:

the hydraulic self-centering expansion shaft disclosed by the utility model has the advantages that the effect of expanding the clamping surface can be achieved by increasing the pressure of hydraulic oil through pressurization, the expansion time is short, and the operation efficiency is high;

the hydraulic expansion shaft is simple in structure, so that the maintenance and the repair work of the hydraulic expansion shaft are very convenient, parts are easy to disassemble for replacement and repair, and meanwhile, the service life of the mandrel is prolonged;

the hydraulic self-centering expansion shaft is wide in application range, can be used for solving the problem of concentricity in the grinding and manufacturing industry, can also be used for solving the problem that the outer diameter of a cutter in the slitting industry is influenced by the matching tolerance of the outer diameter of the cutter, and can also be used for solving the problem of no-damage locking of a smooth shaft surface and an inner hole surface in other industries.

Drawings

FIG. 1 is a schematic view of the assembly of a hydraulic self-centering expansion shaft;

FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a schematic view of the construction of the outer cover portion of FIG. 2;

FIG. 4 is a schematic bottom view of the jacket;

FIG. 5 is a schematic structural view of the inner shaft portion of FIG. 2;

fig. 6 is a bottom structure diagram of the inner shaft.

Wherein, 1-outer sleeve, 2-inner shaft, 3-hydraulic oil cavity;

11-a retainer ring, 12-a clamping surface, 13-a connecting base, 14-a connecting hole and 15-a retaining edge;

21-shaft body, 22-bottom connecting seat, 23-oil filling pressurizing hole, 24-circulating groove, 25-connecting through hole, 26-sealing ring assembling groove, 27-central hole and 28-connecting screw thread.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be given with reference to the accompanying drawings 1-6, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly and clearly defined.

In order to improve the working efficiency of the expansion shaft and prolong the service life of the expansion shaft, the embodiment discloses a hydraulic self-centering expansion shaft which comprises an outer sleeve 1 and an inner shaft 2, wherein the outer sleeve 1 is coaxially connected with the inner shaft 2, the outer sleeve 1 consists of a check ring 11, a clamping surface 12 and a connecting base 13 which are integrally formed, and inward blocking edges 15 are formed at the joint of the check ring 11 and the clamping surface 12 and the joint of the clamping surface 12 and the connecting base 13; the inner shaft 2 consists of an integrally formed shaft body 21 and a bottom connecting seat 22, the shaft body 21, the clamping surface 12 and the blocking edge 15 are enclosed to form a hydraulic oil cavity 3, hydraulic oil is filled into the hydraulic oil cavity 3, two oil injection pressurizing holes 23 are symmetrically arranged at the center of the top of the inner shaft 2, the bottoms of the oil injection pressurizing holes 23 are transversely communicated with a circulation groove 24, the other end of the circulation groove 24 is communicated with the hydraulic oil cavity 3 after penetrating through the outer surface of the shaft body 21, and the opening part of each oil injection pressurizing hole 23 is sealed by a sealing plug.

The oil injection pressurizing hole 23 comprises a screwing movable hole communicated with the outside and a hydraulic movable hole arranged in the screwing movable hole and communicated with the screwing movable hole, and a top tightening screw, a sealed iron core and a rubber sealed core are sequentially arranged in the screwing movable hole from outside to inside, and the top tightening screw is in threaded connection with the screwing movable hole.

A plurality of connecting holes 14 penetrating through the upper surface and the lower surface of the connecting base 13 are circumferentially arranged on the connecting base, a plurality of connecting through holes 25 are circumferentially arranged on the bottom connecting seat 22 at positions corresponding to the connecting holes 14, the connecting holes 14 and the connecting through holes 25 are connected in a bolt fastening mode, and the inner shaft 2 and the outer sleeve 1 are connected in a detachable bolt connecting mode, so that part maintenance and part replacement are facilitated, and the service life of a workpiece is prolonged.

Two rings of seal ring assembling grooves 26 are respectively arranged on the outer annular surface of the shaft body 21 at positions corresponding to the retainer ring 11 and the connecting base 13, and seal rings are assembled in the seal ring assembling grooves 26.

A center hole 27 for tip grinding is provided at the center of the top and bottom of the shaft body 21, respectively.

And a connecting thread 28 is arranged on the outer annular surface of the top of the shaft body 21 higher than the retainer ring 11 and is used for matching with a nut to fix a workpiece.

When the sealing plug is used, the top-tightening screw is screwed in rightwards to pressurize to the bottom of the hole, the sealing iron core and the rubber sealing core are pushed to the bottom of the hydraulic movable hole, pressure is generated to force the clamping surface to be outwards expanded (a workpiece is locked), after the machining is finished, the top-tightening screw is screwed backwards leftwards, the clamping surface has hardness and material recovery memory, the sealing iron core and the rubber sealing core are made to retreat in the hydraulic movable hole, so that the clamping surface 12 is reset, the clamping surface 12 reaches the size of an inner hole of the workpiece after being expanded, the outer circle is machined after being completely attached to the workpiece, and the expansion shaft is utilized for machining to achieve the coaxiality of less than 0.005. And taking out the workpiece.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The hydraulic self-centering expansion shaft is characterized by comprising an outer sleeve (1) and an inner shaft (2), wherein the outer sleeve (1) is coaxially connected with the inner shaft (2), the outer sleeve (1) consists of a check ring (11), a clamping surface (12) and a connecting base (13), and inward blocking edges (15) are formed at the joint of the check ring (11) and the clamping surface (12) and the joint of the clamping surface (12) and the connecting base (13); interior axle (2) are including axle body (21) and bottom connecting seat (22), axle body (21), clamping face (12) and fender edge (15) enclose to close and form hydraulic oil cavity (3), pour into hydraulic oil in hydraulic oil cavity (3), be equipped with two oiling pressure ports (23) at interior axle (2) top centrosymmetry, transversely communicate one circulation groove (24) in oiling pressure port (23) bottom, the other end of circulation groove (24) link up behind axle body (21) surface with hydraulic oil cavity (3) intercommunication, oiling pressure port (23) oral area is sealed with the sealing plug.

2. The hydraulic self-centering expansion shaft as claimed in claim 1, wherein the oil injection pressurizing hole (23) comprises a screwing movable hole communicating with the outside and a hydraulic movable hole provided in the screwing movable hole and communicating with the same, and a top screw, a seal iron core and a rubber seal core are sequentially provided in the screwing movable hole from the outside to the inside, and the top screw is in threaded connection with the screwing movable hole.

3. A hydraulic self-centering expansion shaft according to claim 2, wherein a plurality of connection holes (14) penetrating through the upper and lower surfaces thereof are circumferentially formed on the connection base (13), a plurality of connection through holes (25) are circumferentially formed on the bottom connection base (22) at positions corresponding to the connection holes (14), and the connection holes (14) and the connection through holes (25) are fastened and connected by bolts.

4. A hydraulic self-centering expansion shaft according to claim 3, wherein two rings of seal ring fitting grooves (26) are formed in the outer circumferential surface of the shaft body (21) at positions corresponding to the retainer ring (11) and the coupling base (13), respectively, and the seal rings are fitted in the seal ring fitting grooves (26).

5. A hydraulic self-centring expansion shaft according to claim 4, characterised in that a central hole (27) is provided in each of the top and bottom of the shaft body (21).

6. A hydraulic self-centring expansion shaft according to claim 5, characterised in that a connecting thread (28) is provided on the outer circumferential surface of the shaft body (21) at the top thereof above the collar (11).

7. A hydraulic self-centering expansion shaft according to claim 6, wherein the retainer ring (11), the clamping surface (12) and the connecting base (13) which form the outer sleeve (1) are integrally formed workpieces, and the shaft body (21) and the bottom connecting base (22) which form the inner shaft (2) are also integrally formed workpieces.