CN217290441U

CN217290441U - External live center with replaceable center head

Info

Publication number: CN217290441U
Application number: CN202220715471.0U
Authority: CN
Inventors: 高化民
Original assignee: HENAN MOVABLE CENTRE MACHINERY CO Ltd
Current assignee: HENAN MOVABLE CENTRE MACHINERY CO Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-08-26
Anticipated expiration: 2032-03-30

Abstract

An external live center with a replaceable tip head comprises a shell with openings at two ends, a front end cover, a rear end cover and a tip shaft, wherein the tip shaft is rotatably supported in the shell, the front end and the rear end of the shell are respectively connected with the front end cover and the rear end cover, the front end of the tip shaft is provided with an inner taper hole, the inner taper hole and the tip shaft are coaxial, the rear end of the tip head is provided with a taper handle matched with the taper of the inner taper hole, the taper handle is arranged in the inner taper hole in a conical surface matching mode, and self-locking is formed between the taper handle and the inner taper hole; and a double-layer sealing structure is axially arranged between the front end of the center shaft and the front end cover. The utility model discloses can improve the dismouting efficiency of apex head.

Description

External live center with replaceable center head

Technical Field

The utility model belongs to the technical field of machining, concretely relates to external live center that apex head can be traded.

Background

At present, because the shaft arm of the live center is longer, the shaft arm is stressed greatly and cannot bear the use of large-tonnage equipment, the tip head is difficult to replace after being worn out in use, particularly, when the bearing capacity is larger, the wear rate of the tip head is increased, the frequency of replacement is increased, and therefore the structure and the mode for replacing the tip head in a dismounting mode need to be improved so as to realize quick dismounting after the tip head is worn out.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an external live center with replaceable apex head to improve the disassembly and assembly efficiency of the apex head.

In order to realize the purpose, the utility model discloses the technical scheme who adopts is: an external live center with a replaceable tip head comprises a shell with openings at two ends, a front end cover, a rear end cover and a tip shaft, wherein the tip shaft is rotatably supported in the shell, the front end and the rear end of the shell are respectively connected with the front end cover and the rear end cover, the front end of the tip shaft is provided with an inner taper hole, the inner taper hole and the tip shaft are coaxial, the rear end of the tip head is provided with a taper handle matched with the taper of the inner taper hole, the taper handle is arranged in the inner taper hole in a conical surface matching mode, and self-locking is formed between the taper handle and the inner taper hole; and a double-layer sealing structure is axially arranged between the front end of the center shaft and the front end cover.

The double-layer sealing structure is a double-layer framework sealing structure, the framework sealing structure positioned on the outer side is used for preventing external grinding fluid or grinding particles from entering the tip, and the framework sealing structure positioned on the inner side is used for preventing internal lubricating oil from leaking.

And a double-row cylindrical roller bearing is arranged between the front end of the tip shaft and the inner wall of the shell.

The angle of the tip end of the ejector tip is 60-90 degrees.

Preferably, the angle of the apex tip is 60 °, 70 °, 75 ° or 90 °.

The taper of the pointed-end taper shank is 1:7, 1:10 or 1: 20.

And a needle bearing is arranged between the rear end of the center shaft and the inner wall of the shell.

The utility model has the advantages that: the center head of the utility model forms a self-locking structure through conical surface matching, thereby realizing the quick assembly and disassembly on the center shaft, improving the application range of the live center and reducing the cost investment of customers; and the convenient dismouting mode of apex head can make things convenient for the customer to select the apex head of different specifications as required, reduces customer's cost.

The utility model discloses adopt two skeleton seal structure to seal at the front end of apical axis, first one is sealed can prevent that outside grinding fluid and grinding grain from getting into apical inside, and the second is sealed can prevent that top inside lubricating oil from outwards revealing.

The utility model discloses still pass through double-row cylindrical roller bearing at the apical axis front end for apical axis increases the bulk strength and the bearing capacity of the apical axis of crude height, and more rolling element can be so that the more even dispersion of bearing capacity to the apical axis, improves the life of apical axis.

The utility model provides a tapering of apex point taper shank can form auto-lock structure with the inner taper hole of apex axle, and consequently the dismouting apex point is more convenient.

Drawings

FIG. 1 is a schematic view of the present invention;

the labels in the figure are: 1. the device comprises a shell, 2, a tip shaft, 3, an inner taper hole, 4, a taper shank, 5, a front end cover, 6, a tip, 7, a framework sealing structure, 8, a cylindrical roller bearing, 9, a needle bearing, 10 and a rear end cover.

Detailed Description

The following detailed description of the present invention is provided with reference to the accompanying drawings and examples, but not to be construed as limiting the present invention in any way.

Referring to the attached drawings, the external live center with the replaceable ejector tip comprises a shell 1, an ejector tip shaft 2, a front end cover 5, an ejector tip 6 and a rear end cover 10, wherein the front end cover 5 and the rear end cover 10 are respectively installed at the front end and the rear end of the shell 1 through screws, the rear end cover 10 is a circular cover plate, a sealing ring is arranged between the inner side surface of the rear end cover and the shell, the front end cover 5 is in a circular ring shape, and the sealing ring is also arranged between the inner ring surface of the front end cover and the shell 1. The center shaft 2 is rotatably supported in a cavity formed by the shell 1, the front end cover 5 and the rear end cover 10, the rear end of the center shaft 2 is supported on the shell 1 through a needle bearing 9, and the front end of the center shaft 2 is supported on the shell 1 through double-row cylindrical roller bearings arranged side by side so as to improve the overall strength and the bearing capacity of the center shaft 2; still be equipped with the seal structure that is located between apex axle 2 and the shell 1 at cylindrical roller bearing 8's front end, the utility model discloses a skeleton seal structure 7 to set up twice skeleton seal structure 7 side by side along the axial, first one is sealed can prevent that outside grinding fluid and grinding grain from getting into top inside, and the second is sealed can prevent that top inside lubricating oil from outwards revealing.

The inner diameter of the front end cover 5 is provided with a flange extending radially towards the circle center direction, and the flange is extruded on the end face of the first skeleton sealing structure 7. The end surface of the front end cover 5 is flush with the front end surface of the tip shaft 2.

The center of the front end face of the center shaft 2 is provided with an inner taper hole 3 along the axial direction, the front end of the center head 6 is a tip end, the rear end of the center shaft is a taper shank 4, the taper shank 4 is provided with an outer taper face matched with the taper of the inner taper hole 3, self-locking is formed through the matching of the taper shank 4 and the taper face of the inner taper hole 3, and the center head 6 is installed on the center shaft 2. In order to realize the self-locking of the taper shank 4 and the inner taper hole 3, the taper of the taper shank 4 and the taper hole 3 are set to be 1:7, 1:10 or 1: 20.

The tip angle of the front end of the apex 6 is set to be 60-90 degrees, and further preferably 60 degrees, 70 degrees, 75 degrees or 90 degrees.

The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the embodiments of the present invention can be modified or replaced with equivalents with reference to the above embodiments, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are all within the scope of the claims of the present application.

Claims

1. The utility model provides an external live center that apex head can be traded, includes both ends open-ended shell, front end housing, rear end cap and apex axle, and the rotatable support of apex axle is in the shell, and both ends are connected its characterized in that with front end housing and rear end cap respectively around the shell: the front end of the tip shaft is provided with an inner taper hole, the inner taper hole and the tip shaft are coaxial, the rear end of the tip head is provided with a taper handle matched with the taper of the inner taper hole, the taper handle is installed in the inner taper hole in a taper fit mode, and self-locking is formed between the taper handle and the inner taper hole; and a double-layer sealing structure is axially arranged between the front end of the center shaft and the front end cover.

2. The apex replaceable external live center of claim 1, wherein: the double-layer sealing structure is a double-layer framework sealing structure, the framework sealing structure positioned on the outer side is used for preventing external grinding fluid or grinding particles from entering the tip, and the framework sealing structure positioned on the inner side is used for preventing internal lubricating oil from leaking.

3. The exchangeable apical tip of claim 1, wherein: and a double-row cylindrical roller bearing is arranged between the front end of the tip shaft and the inner wall of the shell.

4. The exchangeable apical tip of claim 1, wherein: the angle of the tip end of the ejector tip is 60-90 degrees.

5. The apex replaceable external live center of claim 1, wherein: the angle of the apex tip is 60 °, 70 °, 75 ° or 90 °.

6. The apex replaceable external live center of claim 1, wherein: the taper of the pointed-end taper shank is 1:7, 1:10 or 1: 20.

7. The apex replaceable external live center of claim 1, wherein: and a needle bearing is arranged between the rear end of the center shaft and the inner wall of the shell.