CN212822725U - Multi-purpose quick change live center - Google Patents
Multi-purpose quick change live center Download PDFInfo
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- CN212822725U CN212822725U CN202021440332.9U CN202021440332U CN212822725U CN 212822725 U CN212822725 U CN 212822725U CN 202021440332 U CN202021440332 U CN 202021440332U CN 212822725 U CN212822725 U CN 212822725U
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- center
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- elastic jacket
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- 210000004907 gland Anatomy 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 6
- 238000003754 machining Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 7
- 239000000428 dust Substances 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a multi-purpose quick-change live center structure, which comprises a center seat, a center shaft, a bearing, a gland, an elastic jacket, a press cap and a center head; the center seat and the center shaft are connected together through a bearing, and the center shaft can stably rotate in the center seat; the center shaft, the elastic jacket and the pressing cap are matched for use, so that the elastic jacket can contract or expand, and the center or the workpiece can be clamped or loosened by the elastic jacket; the utility model is provided with a plurality of top points with different angles and diameters, and can process a plurality of workpieces with different center holes or orifice chamfers only by replacing the top points; furthermore, the utility model discloses the different elasticity in a plurality of apertures that have supporting use press from both sides the cover, can carry out the centre gripping to the slender axles class work piece of different diameters, prevent that the work piece from warping, improve the machining precision of work piece, the utility model discloses the structure sets up novelty, and is safe high-efficient, practices thrift the cost, improves the machining precision, is an ideal machining appurtenance.
Description
Technical Field
The utility model belongs to the technical field of machining appurtenance, concretely relates to multi-purpose quick change live center.
Background
It is known that, in the field of machining, a live center is a widely used machine tool accessory product, and mainly plays a role in supporting and pressing a workpiece, the current live center generally comprises a live center seat, a bearing and a live center shaft, the live center matched with a workpiece central hole or an orifice chamfer needs to be used when the workpiece is machined, and if the workpiece with various central holes or orifice chamfers is machined, a plurality of live centers need to be integrally replaced, for example: when a pipe fitting with a larger diameter is processed, the larger umbrella-shaped tip needs to be replaced, so that the use cost is very high; the main damaged part of the live center in the use process is the center shaft, if the damaged center shaft needs to be replaced, the bearing is easily damaged in the disassembly process, so that not only is great waste caused, but also the precision cannot be ensured after the center shaft is replaced and assembled; in addition, when some slender shaft type workpieces are machined, the workpieces are slender and easy to bend, and therefore machining precision and quality of the workpieces are low.
In view of the above drawbacks, as a technical worker in the industry, how to design a multi-purpose quick-change live center through technical improvement is to solve the technical problems that the existing live center is high in use cost and difficult to ensure precision, and the technical worker in the industry needs to solve urgently.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a multi-purpose quick-change live center, which can process various workpieces with different central holes or orifice chamfers by only replacing the apex head with the same live center, and only needs to replace the apex head when the apex head is damaged, the structure of the live center body is unchanged, and the precision of the live center after the apex head is replaced can be ensured; when some slender shaft type workpieces are machined, the mode that the live center supports the workpieces is changed from top pressing into clamping, the deformation of the workpieces is effectively prevented, and the machining precision of the workpieces is guaranteed.
In order to achieve the technical purpose, the utility model adopts the following technical scheme: a multi-purpose quick-change live center comprises a center seat, a bearing, a center shaft, an elastic jacket, a pressing cap and a center head, wherein a cone is arranged at the rear end of the center seat and is matched and connected with a main shaft hole of an equipment tailstock, the middle part of the cone is provided with threads and a through hole, a protective screw is arranged at the tail end of the cone, and a threaded hole and an inner cavity hole are arranged at the front end of the center seat; the threaded hole is positioned outside the inner cavity hole, and the inner cavity hole is a step hole and is positioned outside the large hole; a plurality of bearings are arranged in the inner cavity hole, ball bearings with different sizes are arranged at two ends, a thrust bearing is arranged in the middle, annular gaskets are respectively arranged among the three bearings for isolation, and a tip shaft penetrates through the middle of the three bearings; the rear end of the center shaft is provided with a two-stage step shaft, a large ball bearing and a thrust bearing are assembled on the large shaft, a small ball bearing is assembled on the small shaft, the front end of the center shaft is provided with an external thread and an internal taper hole, the thread is used for connecting a press cap, and the internal taper hole is used for installing an elastic jacket; a center hole of the elastic jacket is internally provided with a center point, and the center point is connected to a center point shaft through the elastic jacket and a pressing cap; the gland is installed on the internal thread hole of apex seat, the gland has the screw thread outward, and there is the annular in, installation dustproof sealing ring in the annular, and the big excircle of front end of apex axle is being wrapped to dustproof sealing, and the purpose prevents the invasion of dust and fluid, has two rectangle recesses of symmetry on the gland terminal surface.
The elastic jacket is a cone, an outer ring groove is arranged on the cone, a through hole is arranged in the middle of the cone, and a plurality of blind grooves communicated with the middle hole are uniformly arranged on the cone, so that when the pressing cap is screwed down or loosened, the elastic jacket is enabled to move in the conical hole of the center shaft, the contraction and the expansion are realized, and the center shaft or a workpiece is clamped or loosened; the pressing cap is characterized in that a plurality of grooves are uniformly formed in the outer circle of the pressing cap, an internal thread is formed in the pressing cap, an eccentric circle and an internal conical surface are formed, the diameter of the eccentric circle is smaller than the diameter of the large outer circle of the elastic clamping sleeve, the thickness of the eccentric circle is smaller than the width of the outer annular groove in the cone of the elastic clamping sleeve, the internal thread is in external threaded connection with the tip shaft, the eccentric circle is clamped into the outer annular groove of the elastic clamping sleeve, the internal conical surface of the pressing cap is in contact with the front conical surface of the elastic clamping sleeve, and.
The tail part of the tip head is a cone or a truncated cone with different angles and diameters, the tail part of the tip head is arranged in a middle hole of the elastic jacket, the elastic jacket and the pressing cap connect or separate the tip head and the tip shaft, and the elastic jacket and the pressing cap can clamp or release workpieces by the same method.
In addition, the utility model discloses have the elasticity that a plurality of apertures that can form a complete set and use are different and press from both sides the cover, the purpose is used for the slender axles class work piece of different diameters of centre gripping.
The utility model has the advantages that: through the arrangement, the elastic clamping sleeve is contracted or released through the matching of the inner taper hole on the top tip shaft and the elastic clamping sleeve and the pressing cap, so that the top tip or a workpiece is clamped or loosened; moreover, the utility model is provided with a plurality of top heads with different angles and diameters, and can realize the processing of various workpieces with different center holes or orifice chamfers only by replacing the top heads, the structure of the utility model is novel, safe and efficient, and saves the cost; the machining precision of the slender shaft type workpiece is improved, and the auxiliary tool is an ideal machining auxiliary tool.
Drawings
Fig. 1 is an exploded view of the three-dimensional structure of the present invention;
FIG. 2 is a schematic view of the front view of the small apex head assembly of the present invention;
FIG. 3 is a schematic view of the main view of the fully-sectioned structure of the large apex head assembly of the present invention;
in the attached drawing, 1, a protection screw, 2, a tip seat, 3, a ball bearing, 4, a gasket, 5, a thrust bearing, 6, a gasket, 7, a ball bearing, 8, a tip shaft, 9, a gland, 10, an elastic jacket, 11, a pressing cap, 12, a small tip, 13 and a large tip are shown.
Detailed Description
Referring to the attached drawings, the multipurpose quick-change live center comprises a live center seat 2, wherein a Morse No. 5 cone is arranged at the rear end of the live center seat 2, the Morse No. 5 cone is matched and connected with a spindle hole of an equipment tailstock, and the middle part of the cone is provided with internal threads and a through hole; the protection screw 1 is arranged at the tail end of the cone and plays a role of protecting the cone when the live center is disassembled; the front end of the tip seat 2 is provided with an internal threaded hole and an internal cavity hole, the internal threaded hole is positioned outside the internal cavity hole, the internal cavity hole is a secondary step hole and is positioned outside a large hole, 6205 ball bearings 3 and 51206 thrust bearings 5 and 6206 ball bearings 7 are respectively assembled in the secondary step hole, a secondary step shaft at the rear end of the tip shaft 8 penetrates through the middle holes of the 6205 ball bearings 3 and 51206 thrust bearings 5 and 6206 ball bearings 7, the 6205 ball bearings 3 are assembled on the small outer circle of the tip shaft 8, the middle is isolated by a gasket 4, the gasket 4 presses on the outer ring wall of the 6205 ball bearings 3, 51206 thrust bearings 5 and 6206 ball bearings are assembled on the large outer circle of the tip shaft 8, the 51206 thrust bearing 5 is positioned between the 6205 ball bearings 3 and 6206 ball bearings, the 51206 thrust bearing 5 and the ball bearings 6 ball bearings are isolated by the gasket 6, and the gasket 6 presses on the inner ring wall of the 6206 ball bearings 7, thus the tip seat 2 and the tip shaft 6208 ball bearings are connected together through the 6205 and 51206 thrust bearings 6206 ball bearings, the center shaft 8 can stably rotate in the hole of the center seat 2, the front end of the center shaft 8 is provided with an external thread and an internal taper hole, the internal taper hole of the center shaft 8 is provided with a flexible jacket 10, and the external thread of the center shaft 8 is connected with a pressing cap 11; the gland 9 is installed in the internal thread hole of the front end of the center seat 2, the inside of the gland 9 is provided with a ring groove, a dustproof sealing ring is installed in the ring groove, and the sealing ring coats the large outer circle of the front end of the center shaft, so that the dust and oil can be prevented from intruding.
The elastic clamping sleeve 10 is in a double-cone shape, an outer annular groove is formed in the double cone, the depth of the outer annular groove is 1.5mm, a through hole is formed in the middle of the double cone, and a plurality of blind grooves communicated with the middle hole are uniformly formed in the double cone, so that when the pressing cap 11 is screwed down or loosened, the elastic clamping sleeve 10 can move in the conical hole of the center shaft 8, the elastic clamping sleeve 10 can contract or expand, and the center head 12 or 13 or a workpiece can be clamped or loosened; the outer circle of the pressure cap 11 is uniformly provided with 6 grooves, the purpose is to screw or loosen the pressure cap 11 by using a hook wrench, the pressure cap 11 is internally provided with internal threads, an eccentric circle and an internal conical surface, the eccentric circle and the central line of the pressure cap 11 have an offset of 1.2mm, the diameter of the eccentric circle is 0.1-0.2mm smaller than the diameter of the large excircle of the elastic jacket 10, the thickness of the eccentric circle is smaller than the width of the outer ring groove of the large excircle of the elastic jacket 10, thus, the eccentric circle of the pressing cap 11 can be clamped into the outer annular groove of the elastic jacket 10, the inner end thread of the pressing cap 11 is connected with the outer thread of the apical axis 8, the inner conical surface of the pressing cap 11 is contacted with the front outer conical surface of the elastic jacket 10, the pressing cap 11 can move under the driving of the thread when rotating, thus, the elastic jacket 10 can move in the taper hole of the apical axis 8 under the driving of the pressing cap 11, so that the elastic jacket 10 contracts or expands to clamp or release the apical end 12 or 13 or the workpiece; firstly, an elastic jacket 10 is arranged in a pressing cap 11, an inner eccentric circle of the pressing cap 111 is clamped into an outer annular groove of the elastic jacket 10, then the elastic jacket 10 is arranged in a taper hole of a tip shaft 8, the taper hole of the tip shaft 8 is in contact with a rear conical surface of the elastic jacket 10, the tip shaft 8 is connected with the pressing cap 11 through threads, when the pressing cap 11 is screwed down, the pressing cap 11 can drive the elastic jacket 10 to move inwards in the taper hole of the tip shaft 8, the elastic jacket 10 contracts, and positioning and clamping of a tip 12 or 13 or a workpiece are achieved; on the contrary, when the pressing cap 11 is loosened, the eccentric circle clamped into the outer ring groove of the elastic jacket 10 drives the elastic jacket 10 to move outwards in the taper hole of the center shaft 8, and the elastic jacket 10 is opened, so that the center 12 or 13 or the workpiece is loosened.
The tail part of the tip 12 or 13 is a cylinder with the same size, the head part is a cone or a truncated cone with different angles and diameters, the tail part of the tip 12 or 13 is arranged in a middle hole of the elastic jacket 10, the elastic jacket 10 is matched with the pressing cap 11 for use, and the tip 12 or 13 is connected with or separated from the tip shaft 8; the elastic jacket 10 and the pressing cap 11 are matched for use in the same method, and can clamp or release the slender shaft workpiece; the diameter of the cylinder at the rear part of the apical cap 12 or 13 is the same as the aperture of the elastic jacket 10, and the axial length of the cylinder is 3-5mm greater than the distance between the front end surface of the pressure cap 11 and the bottom surface of the taper hole in the apical shaft 8, so as to ensure the stability of the axial position of the apical cap 12 or 13 after being assembled on the apical shaft 8.
The utility model discloses have the different elasticity in a plurality of apertures of supporting use and press from both sides cover 10, its purpose is used for the slender axles class work piece of the different diameters of centre gripping, prevents the deformation of work piece, improves the machining precision of work piece.
After the arrangement is completed, the elastic clamping sleeve 10 clamps or releases the ejector pin 12 or 13 or a workpiece through the cooperation of the ejector pin shaft 8, the elastic clamping sleeve 10 and the pressing cap 11; moreover, the utility model is provided with a plurality of top points 12 or 13 with different angles and diameters, and can process a plurality of workpieces with different central holes or orifice chamfers only by replacing the required top points 12 or 13; the utility model discloses the structure sets up novelty, and is safe high-efficient, practices thrift the cost to can improve the machining precision of work piece, be an ideal machining appurtenance.
Claims (6)
1. A multi-purpose quick change live center which is characterized in that: the rear end of the center seat is provided with a cone, the middle part of the cone is provided with threads and a through hole, the front end of the center seat is provided with internal threads and an inner cavity hole, the threaded hole is positioned outside the inner cavity hole, and the inner cavity hole is a step hole and is positioned outside a large hole; three bearings are arranged in the cavity hole, ball bearings with different sizes are arranged at two ends, a thrust bearing is arranged in the middle, and the three bearings are isolated by gaskets respectively; the rear end of the center shaft is provided with a secondary step shaft which penetrates through the middle holes of the three bearings, the center shaft and the center seat are connected together through the bearings, the center shaft rotates stably in the center seat, the front end of the center shaft is provided with an external thread and an internal taper hole, an elastic jacket is arranged in the internal taper hole, the center head is arranged in the middle hole of the elastic jacket, a pressing cap is connected to the external thread of the center shaft, and the elastic jacket can be driven to move by screwing or loosening the pressing cap; the gland is arranged at the internal thread of the center seat, the inner annular groove of the gland is internally provided with a dustproof sealing ring, and the sealing ring coats the large excircle at the front end of the center shaft.
2. A multi-purpose quick-change live center according to claim 1, wherein: the rear cone of the center seat is a Morse No. 5 cone, and a bearing arranged in an inner cavity hole of the center seat is as follows: 6205 ball bearings and 51206 thrust bearings and 6206 ball bearings.
3. A multi-purpose quick-change live center according to claim 1, wherein: the tip shaft is provided with an external thread and an internal taper hole.
4. A multi-purpose quick-change live center according to claim 1, wherein: the elastic jacket is a cone, an outer ring groove is formed in the cone, a through hole is formed in the middle of the cone, and a plurality of blind grooves communicated with the middle hole are uniformly formed in the cone.
5. A multi-purpose quick-change live center according to claim 1, wherein: the pressing cap is internally provided with an internal thread, an eccentric circle and an internal conical surface, the excircle of the pressing cap is uniformly provided with a plurality of grooves, and the end surface of the pressing cap is provided with two symmetrical rectangular grooves.
6. A multi-purpose quick-change live center according to claim 1, wherein: the tail part of the apical tip is a cylinder, and the head part of the apical tip is a cone or a frustum of a cone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021440332.9U CN212822725U (en) | 2020-07-08 | 2020-07-08 | Multi-purpose quick change live center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021440332.9U CN212822725U (en) | 2020-07-08 | 2020-07-08 | Multi-purpose quick change live center |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212822725U true CN212822725U (en) | 2021-03-30 |
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ID=75119233
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021440332.9U Active CN212822725U (en) | 2020-07-08 | 2020-07-08 | Multi-purpose quick change live center |
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| Country | Link |
|---|---|
| CN (1) | CN212822725U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120940684A (en) * | 2025-10-16 | 2025-11-14 | 南通曼克机械有限公司 | A precision machining device for roller structures |
-
2020
- 2020-07-08 CN CN202021440332.9U patent/CN212822725U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120940684A (en) * | 2025-10-16 | 2025-11-14 | 南通曼克机械有限公司 | A precision machining device for roller structures |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A multi-purpose quick exchange top Effective date of registration: 20211105 Granted publication date: 20210330 Pledgee: Dezhou Bank Co.,Ltd. Pingyuan sub branch Pledgor: SHANDONG ZHENG ZHOU MACHINERY CO.,LTD. Registration number: Y2021980012000 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20221026 Granted publication date: 20210330 Pledgee: Dezhou Bank Co.,Ltd. Pingyuan sub branch Pledgor: SHANDONG ZHENG ZHOU MACHINERY CO.,LTD. Registration number: Y2021980012000 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |