CN216131175U

CN216131175U - Hollow rotary oil hydraulic cylinder applied to cradle turntable

Info

Publication number: CN216131175U
Application number: CN202121876830.2U
Authority: CN
Inventors: 袁杰; 邬伟军; 徐凯; 张旭龙; 周浩东; 王晓锋
Original assignee: Ningbo Haitian Precision Machinery Co Ltd
Current assignee: Ningbo Haitian Precision Machinery Co Ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2022-03-25
Anticipated expiration: 2031-08-11

Abstract

The utility model discloses a hollow rotary oil hydraulic cylinder applied to a cradle turntable, which comprises a fixed support, an outer sleeve, a cylinder body and a hollow piston rod, wherein the outer sleeve is fixed on the fixed support, the cylinder body is rotatably arranged on the inner side of the outer sleeve, the piston rod is vertically arranged on the inner side of the cylinder body in a vertically movable manner, a radial convex ring is integrally arranged on the outer peripheral wall of the piston rod, an upper gland and a lower gland are respectively fixed at the upper end and the lower end of the cylinder body, the upper gland and the lower gland are respectively sleeved on the outer side of the piston rod, the outer sleeve, the upper gland, the piston rod and the radial convex ring form a first oil cavity in a surrounding manner, the outer sleeve, the lower gland, the piston rod and the radial convex ring form a second oil cavity in a surrounding manner, a first oil port and a second oil port are formed in the outer sleeve, the first oil port is communicated with the first oil cavity, and the second oil port is communicated with the second oil cavity. The hollow rotary oil hydraulic cylinder is simple and compact in structure, convenient to assemble, small in occupied space, convenient to produce, low in cost, capable of being vertically installed and applied to cradle rotating tables and adaptive to cradle rotating tables of different models, and strong in universality.

Description

Hollow rotary oil hydraulic cylinder applied to cradle turntable

Technical Field

The utility model relates to a rotary oil hydraulic cylinder, in particular to a hollow rotary oil hydraulic cylinder applied to a cradle turntable.

Background

With the rapid development of the manufacturing industry, chucks for clamping workpieces in numerically controlled machine tools are gradually upgraded from manual chucks to pneumatic chucks, hydraulic chucks, and the like. For the hydraulic chuck, the rotary oil hydraulic cylinder is used in cooperation with the hydraulic chuck to provide tension for the hydraulic chuck, the rotary oil hydraulic cylinder is commonly used for lathes, the installation mode is generally horizontal installation, and meanwhile, the rotary oil hydraulic cylinder needs to meet the requirement of high rotating speed. When the three-axis machine tool is provided with the cradle turntable, the workbench is matched with the hydraulic chuck, the installation mode of the rotary oil pressure cylinder is vertical installation, the space of the cradle turntable is short, the appearance size of the rotary oil pressure cylinder cannot be too large, and the cost is not reasonable due to the fact that the rotary shaft of the workbench rotates at an unpleasant speed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the hollow rotary oil hydraulic cylinder applied to the cradle rotary table is provided aiming at the defects of the prior art, has the advantages of simple and compact structure, convenient assembly, small occupied space, convenient production, low cost, capability of being vertically installed and applied to the cradle rotary table, suitability for cradle rotary tables of different models and strong universality.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a be applied to cavity gyration hydraulic cylinder of cradle revolving stage, includes fixed bolster, overcoat, cylinder body and hollow piston rod, the overcoat fix the fixed bolster on, the cylinder body rotationally install the inboard of overcoat, the piston rod can vertically install with reciprocating in the inboard of cylinder body, the periphery wall an organic whole of piston rod be provided with radial bulge loop, the upper end and the lower extreme of cylinder body be fixed with gland and lower gland respectively, last gland with lower gland overlap respectively the outside of piston rod, overcoat, last gland, piston rod and radial bulge loop enclose into first oil pocket, overcoat, lower gland, piston rod and radial bulge loop enclose into the second oil pocket, the overcoat on seted up first hydraulic fluid port and second hydraulic fluid port, first hydraulic fluid port with first communicating, the second oil port is communicated with the second oil cavity, after the cradle is installed, the fixed support is fixedly connected with the inclined shaft of the cradle rotary table, the upper gland is fixedly connected with the lower end of the rotary shaft of the workbench, and the upper end of the piston rod is fixedly connected with the hydraulic chuck installed on the workbench through a connecting pipe.

The hollow rotary oil hydraulic cylinder is divided into a rotary part and a fixed part according to whether the parts rotate or not, wherein the rotary part comprises a cylinder body, a piston rod, an upper gland, a lower gland and the like, and the fixed part comprises an outer sleeve, a fixed support and the like.

The working principle of the hollow rotary oil hydraulic cylinder is as follows: when a workpiece on a workbench provided with a cradle turntable needs to be fixed by a hydraulic chuck, oil is fed from a first oil port, hydraulic oil is filled in a first oil cavity, a piston rod moves downwards under the action of oil pressure to pull the hydraulic chuck, and the workpiece is fastened by the hydraulic chuck; when the workpiece needs to be loosened, the second oil port is filled with oil, the first oil port returns oil, the second oil cavity is filled with hydraulic oil, the piston rod moves upwards under the action of the oil pressure, and the hydraulic chuck is loosened, so that the workpiece is loosened. During the process of processing the workpiece, the rotary part can rotate along with the rotary shaft of the workbench.

The hollow rotary oil hydraulic cylinder has the advantages of simple and compact structure, convenience in assembly, small occupied space, convenience in production, low cost, capability of being vertically installed and applied to cradle rotating tables and being adaptive to cradle rotating tables of different models, and strong universality.

Preferably, a rotary pressure seal is arranged between the cylinder body and the outer sleeve, and the rotary pressure seal is fixed on the outer sleeve; a first O-shaped sealing ring is arranged between the cylinder body and the upper gland and is fixed on the upper gland; a second O-shaped sealing ring is arranged between the cylinder body and the lower pressing cover and is fixed on the lower pressing cover; a bidirectional piston seal is arranged between the cylinder body and the radial convex ring and is fixed on the radial convex ring; the upper gland and the piston rod are provided with a first U-shaped sealing ring between, the first U-shaped sealing ring is fixed on the upper gland, the lower gland and the piston rod are provided with a second U-shaped sealing ring between, and the second U-shaped sealing ring is fixed on the lower gland. The sealing rings can achieve a good sealing effect, the overall sealing performance of the hollow rotary oil hydraulic cylinder is guaranteed, and oil leakage is prevented.

Preferably, two positioning pins are vertically arranged on two side walls of the radial convex ring in a penetrating mode respectively, two first concave holes which are concave upwards are formed in the lower end of the upper pressing cover, two second concave holes which are concave downwards are formed in the upper end of the lower pressing cover, and the upper end and the lower end of each positioning pin are fixed in the first concave hole and the second concave hole respectively. In the up-and-down moving process of the piston rod, the positioning pin plays a guiding role in the linear motion of the piston rod, the piston rod can be prevented from rotating, and the up-and-down moving reliability of the piston rod and the loosening action of the hydraulic chuck are ensured.

Preferably, a first longitudinal gap is formed between the upper end of each positioning pin and the top surface of the first concave hole where the positioning pin is located, and a second longitudinal gap is formed between the lower end of each positioning pin and the bottom surface of the second concave hole where the positioning pin is located. The design of the first longitudinal gap and the second longitudinal gap can avoid unnecessary part damage caused by the positioning pin pushing the upper gland or the lower gland under the unexpected condition.

Preferably, a third O-ring is disposed between each positioning pin and the radial protruding ring, and the third O-ring is fixed to the positioning pin. The third O-shaped sealing ring is used for effectively isolating the first oil cavity from the second oil cavity and preventing hydraulic oil in the first oil cavity and hydraulic oil in the second oil cavity from mutually permeating.

Preferably, the upper gland covers the upper side of the outer sleeve, a first wear-resistant gasket is arranged between the upper gland and the upper side of the outer sleeve, the first wear-resistant gasket is fixed on the upper gland, the outer sleeve covers the upper side of the lower gland, a second wear-resistant gasket is arranged between the outer sleeve and the lower gland, and the second wear-resistant gasket is fixed on the lower gland. The upper gland and the lower gland play a further role in protecting the outer sleeve and parts in the outer sleeve, and can prevent chips and cutting fluid generated in the process of processing workpieces from entering the inner part of the outer sleeve. Meanwhile, the first wear-resistant gasket and the second wear-resistant gasket can play a role in lubrication, and abrasion to the outer sleeve in the rotation process of the rotation part is reduced.

Preferably, the upper end of the inner hole of the piston rod is an internal thread part, and the internal thread part is in threaded connection with the lower end of the connecting pipe, so that the assembly is convenient.

Compared with the prior art, the utility model has the following advantages: the hollow rotary oil hydraulic cylinder has the advantages of simple and compact structure, convenience in assembly, small occupied space, convenience in production, low cost, capability of being vertically installed and applied to cradle rotating tables and being adaptive to cradle rotating tables of different models, and strong universality.

Drawings

FIG. 1 is a schematic view of a hollow rotary hydraulic cylinder with a piston rod moving downward to tighten a hydraulic chuck;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a schematic view of the hollow rotary hydraulic cylinder with the piston rod moved upward to release the hydraulic chuck;

fig. 4 is a schematic diagram illustrating the effect of the hollow rotary oil hydraulic cylinder after installation in the embodiment.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

The hollow rotary oil pressure cylinder applied to the cradle turntable of the embodiment comprises a fixed support 1, an outer sleeve 2, a cylinder body 3 and a hollow piston rod 4, wherein the outer sleeve 2 is fixed on the fixed support 1, the cylinder body 3 is rotatably arranged on the inner side of the outer sleeve 2, the piston rod 4 is vertically arranged on the inner side of the cylinder body 3 in a way of moving up and down, a radial convex ring 41 is integrally arranged on the peripheral wall of the piston rod 4, an upper gland 5 and a lower gland 6 are respectively fixed on the upper end and the lower end of the cylinder body 3 through screws, the upper gland 5 and the lower gland 6 are respectively sleeved on the outer side of the piston rod 4, the outer sleeve 2, the upper gland 5, the piston rod 4 and the radial convex ring 41 enclose a first oil cavity 42, the outer sleeve 2, the lower gland 6, the piston rod 4 and the radial convex ring 41 enclose a second oil cavity 43, a first oil port 21 and a second oil port 22 are arranged on the outer sleeve 2, the first oil port 21 is communicated with the first oil cavity 42, the second port 22 communicates with the second oil chamber 43.

In the embodiment, a rotary pressure seal 23 is arranged between the cylinder body 3 and the outer sleeve 2, and the rotary pressure seal 23 is fixed on the outer sleeve 2; a first O-shaped sealing ring 51 is arranged between the cylinder body 3 and the upper gland 5, and the first O-shaped sealing ring 51 is fixed on the upper gland 5; a second O-shaped sealing ring 61 is arranged between the cylinder body 3 and the lower gland 6, and the second O-shaped sealing ring 61 is fixed on the lower gland 6; a bidirectional piston seal 44 is arranged between the cylinder body 3 and the radial convex ring 41, and the bidirectional piston seal 44 is fixed on the radial convex ring 41; a first U-shaped sealing ring 52 is arranged between the upper gland 5 and the piston rod 4, the first U-shaped sealing ring 52 is fixed on the upper gland 5, a second U-shaped sealing ring 62 is arranged between the lower gland 6 and the piston rod 4, and the second U-shaped sealing ring 62 is fixed on the lower gland 6.

In this embodiment, two positioning pins 45 are vertically inserted through two side walls of the radial convex ring 41, two first concave holes 53 which are concave upwards are formed in the lower end of the upper pressing cover 5, two second concave holes 63 which are concave downwards are formed in the upper end of the lower pressing cover 6, and the upper end and the lower end of each positioning pin 45 are respectively fixed in one first concave hole 53 and one second concave hole 63; a first longitudinal gap 54 is formed between the upper end of each positioning pin 45 and the top surface of the first concave hole 53 where the positioning pin is located, and a second longitudinal gap 64 is formed between the lower end of each positioning pin 45 and the bottom surface of the second concave hole 63 where the positioning pin is located; a third O-ring seal 46 is disposed between each positioning pin 45 and the radial convex ring 41, and the third O-ring seal 46 is fixed to the positioning pin 45.

In this embodiment, the upper gland 5 covers the upper side of the jacket 2, a first wear-resistant gasket 55 is arranged between the upper gland 5 and the upper side of the jacket 2, the first wear-resistant gasket 55 is fixed on the upper gland 5 through a screw, the jacket 2 covers the upper side of the lower gland 6, a second wear-resistant gasket 65 is arranged between the jacket 2 and the lower gland 6, and the second wear-resistant gasket 65 is fixed on the lower gland 6 through a screw.

In the present embodiment, the upper end of the inner bore of the piston rod 4 is a female screw 47, and the female screw 47 is screwed to the lower end of the connecting pipe 74.

After the hollow rotary hydraulic cylinder is mounted, as shown in fig. 4, the fixing bracket 1 is fixedly connected to the inclined shaft 73 of the cradle turntable 71, the upper cover 5 is fixedly connected to the lower end of the rotating shaft (not shown) of the table 72, and the upper end of the piston rod 4 is fixedly connected to the hydraulic chuck 75 mounted on the table 72 through a connecting pipe 74.

The working principle of the hollow rotary oil hydraulic cylinder is as follows: when a workpiece (not shown in the figure) on the workbench 72 provided with the cradle turntable 71 needs to be fixed by the hydraulic chuck 75, the first oil port 21 is filled with oil, and the first oil chamber 42 is filled with hydraulic oil, the piston rod 4 moves downwards under the action of oil pressure to pull the hydraulic chuck 75, and the workpiece is fastened through the hydraulic chuck 75, and at the moment, the state diagram of the hollow rotary oil cylinder is shown in fig. 1; when a workpiece needs to be loosened, the second oil port 22 is filled with oil, the first oil port 21 returns oil, the second oil chamber 43 is filled with hydraulic oil, the piston rod 4 moves upwards under the action of the oil pressure, the hydraulic chuck 75 is loosened, and the workpiece is loosened, and at the moment, the state diagram of the hollow rotary oil pressure cylinder is shown in fig. 3. The revolving portion can follow the rotation axis of the table 72 for revolving movement during processing of the workpiece.

Claims

1. The utility model provides a be applied to cavity gyration hydraulic cylinder of cradle revolving stage, its characterized in that, includes fixed bolster, overcoat, cylinder body and hollow piston rod, the overcoat fix the fixed bolster on, the cylinder body rotationally install the inboard of overcoat, the piston rod can vertically install with reciprocating in the inboard of cylinder body, the periphery wall an organic whole of piston rod be provided with radial bulge loop, the upper end and the lower extreme of cylinder body be fixed with gland and lower gland respectively, upper gland with lower gland overlap respectively the outside of piston rod, overcoat, upper gland, piston rod and radial bulge loop enclose into first oil pocket, overcoat, lower gland, piston rod and radial bulge loop enclose into the second oil pocket, the overcoat on seted up first hydraulic fluid port and second hydraulic fluid port, first hydraulic fluid port with first oil pocket communicate with each other, the second oil port is communicated with the second oil cavity, after the cradle is installed, the fixed support is fixedly connected with the inclined shaft of the cradle rotary table, the upper gland is fixedly connected with the lower end of the rotary shaft of the workbench, and the upper end of the piston rod is fixedly connected with the hydraulic chuck installed on the workbench through a connecting pipe.

2. The hollow rotary oil hydraulic cylinder applied to the cradle turntable as claimed in claim 1, wherein a rotary pressure seal is arranged between the cylinder body and the outer sleeve, and the rotary pressure seal is fixed on the outer sleeve; a first O-shaped sealing ring is arranged between the cylinder body and the upper gland and is fixed on the upper gland; a second O-shaped sealing ring is arranged between the cylinder body and the lower pressing cover and is fixed on the lower pressing cover; a bidirectional piston seal is arranged between the cylinder body and the radial convex ring and is fixed on the radial convex ring; the upper gland and the piston rod are provided with a first U-shaped sealing ring between, the first U-shaped sealing ring is fixed on the upper gland, the lower gland and the piston rod are provided with a second U-shaped sealing ring between, and the second U-shaped sealing ring is fixed on the lower gland.

3. The hollow rotary oil hydraulic cylinder for cradle turntable according to claim 1 or 2, wherein two positioning pins are respectively vertically inserted through two side walls of the radial convex ring, two first concave holes are formed at the lower end of the upper gland, two second concave holes are formed at the upper end of the lower gland, and the upper end and the lower end of each positioning pin are respectively fixed in one first concave hole and one second concave hole.

4. The hollow rotary oil pressure cylinder applied to the cradle turntable as claimed in claim 3, wherein a first longitudinal gap is formed between the upper end of each positioning pin and the top surface of the first concave hole where the positioning pin is located, and a second longitudinal gap is formed between the lower end of each positioning pin and the bottom surface of the second concave hole where the positioning pin is located.

5. The hollow rotary oil pressure cylinder applied to a cradle turntable as claimed in claim 3, wherein a third O-ring is disposed between each positioning pin and the radial protruding ring, and the third O-ring is fixed on the positioning pin.

6. The hollow rotary oil hydraulic cylinder applied to a cradle turntable according to claim 1, wherein the upper gland covers the upper side of the outer sleeve, a first wear-resistant gasket is arranged between the upper gland and the upper side of the outer sleeve, the first wear-resistant gasket is fixed on the upper gland, the outer sleeve covers the upper side of the lower gland, a second wear-resistant gasket is arranged between the outer sleeve and the lower gland, and the second wear-resistant gasket is fixed on the lower gland.

7. The hollow rotary oil pressure cylinder applied to a cradle turntable according to claim 1, wherein the upper end of the inner hole of the piston rod is an internal thread part, and the internal thread part is in threaded connection with the lower end of the connecting pipe.