CN109531187B - Built-in self-centering steady rest - Google Patents
Built-in self-centering steady rest Download PDFInfo
- Publication number
- CN109531187B CN109531187B CN201811604848.XA CN201811604848A CN109531187B CN 109531187 B CN109531187 B CN 109531187B CN 201811604848 A CN201811604848 A CN 201811604848A CN 109531187 B CN109531187 B CN 109531187B
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- arm
- center
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- center arm
- piston
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- 239000003921 oil Substances 0.000 claims description 38
- 230000000670 limiting effect Effects 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 claims description 4
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/72—Auxiliary arrangements; Interconnections between auxiliary tables and movable machine elements
- B23Q1/76—Steadies; Rests
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
- Actuator (AREA)
Abstract
The invention provides a built-in self-centering center frame, and belongs to the technical field of machine tool center frames. This concealed is from centering center frame includes the casing, but the activity is provided with vertical displacement's center arm on the casing, still the activity is provided with two support arms of distribution in center arm both sides on the casing, the support arm middle part is articulated with the casing, the center arm passes through connection structure and the lower extreme of two support arms is connected, drive two support arms and swing around its pin joint when the center arm reciprocates, when the center arm moves up, two support arm upper ends fold inwards, when the center arm moves down, two support arm upper ends outwards open, are provided with the hydro-cylinder structure that is used for driving the center arm to reciprocate in the casing. The concealed self-centering center frame has the advantages of more compact structure, large clamping range and high reliability.
Description
Technical Field
The invention belongs to the technical field of machine tool center frames, and relates to an inner concealed self-centering center frame.
Background
The machine tool is often provided with a center frame for clamping a workpiece, the mechanical three-jaw transfer center frame is widely adopted in the market at present, the size of the machine tool is large, the time for loading and unloading the workpiece is long, the center of the workpiece also needs to be adjusted during working, and the machine tool is not suitable for the applicable environment with small installation space and large clamping range and has poor reliability.
In summary, the invention designs the concealed self-centering center frame which has the advantages of more compact structure, large clamping range and high reliability.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides the built-in self-centering center frame which is more compact in structure, large in clamping range and high in reliability.
The invention aims at realizing the technical scheme that the concealed self-centering center frame comprises a shell, wherein a center arm capable of vertically moving up and down is movably arranged on the shell, two support arms distributed on two sides of the center arm are movably arranged on the shell, the middle parts of the support arms are hinged with the shell, the center arm is connected with the lower ends of the two support arms through a connecting structure, the two support arms are driven to swing around a hinging point when the center arm moves up and down, the upper ends of the two support arms are folded inwards when the center arm moves up, the upper ends of the two support arms are outwards opened when the center arm moves down, and an oil cylinder structure for driving the center arm to move up and down is arranged in the shell.
As a further improvement of the invention, the upper ends of the support arms always extend out of the shell, the upper ends of the center arms extend out of the shell when the center arms move upwards, the upper ends of the center arms retract into the shell when the center arms move downwards, and the middle parts and the lower end parts of the center arms and the two support arms are always positioned in the shell.
As a further improvement of the invention, the oil cylinder structure is provided with a hydraulic oil cylinder structure, the oil cylinder structure comprises an oil cylinder shell, a piston shaft and an oil cylinder piston arranged outside the upper end of the piston shaft, the central arm main body is the oil cylinder shell of the oil cylinder structure, a movable cavity with a downward opening is arranged at the position from the middle part to the lower end of the central arm, a piston limiting block positioned at the opening of the movable cavity is fixed at the end part of the lower end of the central arm, the piston shaft is inserted on the movable cavity, the lower end of the piston shaft is fixed with the shell, the oil cylinder piston is arranged in the movable cavity and is connected with the inner wall of the movable cavity, and when the central arm moves up to a preset position, the piston limiting block and the oil cylinder piston are propped against each other.
As a further improvement of the invention, the shell comprises a cavity and a front cover plate covered on the surface of the cavity, a piston shaft cover plate and a cylinder cover positioned outside the piston shaft cover plate are connected to the lower part of the cavity, and the lower end of the piston shaft is detachably arranged between the piston Zhou Gaiban and the cylinder cover.
As a further improvement of the invention, the end part of the lower end of the support arm is hinged with a needle bearing, the connecting structure comprises a curved boss, the curved boss comprises a fixed part and two sliding parts fixed on two sides of the fixed part, the two sliding parts are in one-to-one correspondence with the two support arms, the fixed part is fixedly connected with the center arm, the sliding parts are provided with curved slide ways for the needle bearing at the lower end of the corresponding support arm to move, the face part of each sliding part is detachably provided with a regression plate, the back surface of the regression plate is provided with a limit chute matched with the corresponding curved slide way, and the needle bearing at the lower end of the support arm is positioned in the corresponding limit chute.
As a further improvement of the invention, a limiting pin is arranged at the lower end of at least one sliding part, and when the center arm moves down to a preset position, the limiting pin is propped against the lower end of the shell.
As a further improvement of the invention, needle bearings are respectively hinged at the upper end part of the central arm and the upper end part of the support arm, and the upper end part of the central arm/support arm is also provided with protective sheets distributed on the periphery of the corresponding needle bearings.
As a further development of the invention, a manual fine adjustment mechanism is provided in the central arm in connection with the corresponding needle bearing.
Based on the technical scheme, the oil cylinder structure for driving the center arm of the built-in self-centering center frame is hidden in the shell, has obvious difference with the existing oil cylinder driving scheme adopting the external oil cylinder, namely, the built-in oil cylinder is adopted, the whole structure is more compact, the oil cylinder is adopted to push the middle center arm, and simultaneously drives the two support arms to swing, namely, the motion quantity of the two chucks and one support head is realized.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of an open configuration of a support arm according to a preferred embodiment of the present invention.
FIG. 3 is a schematic diagram of a closed arm structure according to a preferred embodiment of the present invention.
FIG. 4 is a schematic view of a portion of a support arm in a closed state according to a preferred embodiment of the invention.
Fig. 5 is a cross-sectional view taken along A-A in fig. 4.
FIG. 6 is a partial schematic view of an arm in an expanded state according to a preferred embodiment of the present invention.
Fig. 7 is a partial schematic view of the structure of fig. 6.
Fig. 8 is a schematic view of a curved boss according to a preferred embodiment of the present invention.
FIG. 9 is a schematic diagram of a regression plate according to a preferred embodiment of the invention.
In the figure, 100 parts of a shell, 110 parts of a cavity, 120 parts of a front cover plate, 130 parts of a piston shaft cover plate, 140 parts of a cylinder cover, 200 parts of a center arm, 210 parts of a movable cavity, 300 parts of a support arm, 410 parts of a curved surface boss, 411 parts of a fixed part, 412 parts of a sliding part, 413 parts of a curved surface slideway, 420 parts of a return plate, 421 parts of a limiting chute, 510 parts of a piston shaft, 520 parts of a cylinder piston, 530 parts of a piston limiting block, 600 parts of a needle bearing, 700 parts of a protection plate, 810 parts of a limiting pin, 820 parts of a plug.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The technical solution provided by the present invention is described in more detail below with reference to fig. 1 to 9.
As shown in fig. 1 to 9, the built-in self-centering center frame comprises a housing 100, a center arm 200 capable of vertically moving up and down is movably arranged on the housing 100, two support arms 300 distributed on two sides of the center arm 200 are movably arranged on the housing 100, the middle parts of the support arms 300 are hinged with the housing 100, the center arm 200 is connected with the lower ends of the two support arms 300 through a connecting structure, the two support arms 300 are driven to swing around the hinging point when the center arm 200 moves up and down, when the center arm 200 moves up, the upper ends of the two support arms 300 are folded inwards, when the center arm 200 moves down, the upper ends of the two support arms 300 are outwards opened, and an oil cylinder structure for driving the center arm 200 to move up and down is arranged inside the housing 100.
The invention protects an inner self-centering center frame, the oil cylinder structure for driving the center arm 200 is hidden in the shell 100, and has obvious difference with the existing oil cylinder driving scheme adopting the outer arrangement, namely the scheme adopts the inner oil cylinder design, the whole structure is more compact, the oil cylinder (preferably a hydraulic oil cylinder) is adopted to push the middle center arm 200, and simultaneously the two support arms 300 are driven to swing, so that the motion quantity of the two chucks and one support head is realized.
In the present invention, in order to make the structural layout more compact and to ensure the reliability of the overall operation, it is preferable that the upper ends of the arms 300 extend out of the housing 100 all the time, the upper ends of the arms 200 extend out of the housing 100 when the center arm 200 moves upward, the upper ends of the arms 200 retract into the housing 100 when the center arm 200 moves downward, and the middle and lower end portions of the center arm 200 and the two arms 300 are always located in the housing 100.
As a preferred or alternative embodiment, the cylinder structure is configured as a hydraulic cylinder structure, the cylinder structure includes a cylinder housing 100, a piston shaft 510, and a cylinder piston 520 disposed outside the upper end of the piston shaft 510, the main body of the center arm 200 is the cylinder housing 100 of the cylinder structure, a movable cavity 210 with a downward opening is disposed in the middle to the lower end of the center arm 200, a piston stopper 530 located at the opening of the movable cavity 210 is fixed at the end of the lower end of the center arm 200, the piston shaft 510 is inserted into the movable cavity 210, the lower end of the piston shaft 510 is fixed with the housing 100, the cylinder piston 520 is disposed in the movable cavity 210 and is connected with the inner wall of the movable cavity 210, and when the center arm 200 moves up to a preset position, the piston stopper 530 and the cylinder piston 520 are abutted, because the piston shaft 510 is attached to the cylinder piston 520 above the piston housing 100, and the center arm 200 is at the highest upward position due to the limiting effect of the piston stopper 530.
In this case, the main structure of the center arm 200 is the cylinder housing 100 of the cylinder structure, which omits to separately set the cylinder housing 100 and the connection and coordination structure thereof, and the center arm 200 also forms a component part of the cylinder structure, so that the structure is more compact and the operation is more reliable.
Further, the casing 100 includes a cavity 110 and a front cover plate 120 covering the surface of the cavity 110, the lower part of the cavity 110 is connected with a piston shaft 510 cover plate 130 and a cylinder cover 140 located outside the piston shaft 510 cover plate 130, the lower end of the piston shaft 510 is detachably installed between the piston Zhou Gaiban and the cylinder cover 140, so that maintenance is convenient, and the whole central frame area occupied by the piston shaft 510 cover plate 130 and the cylinder cover 140 is small.
An oil path system is arranged on the shell 100, a channel for communicating the oil path system with the movable cavity 210 is arranged in the middle of the piston shaft 510, and an oil path communicated with the channel is further arranged on the oil cylinder cover 140, so that oil inlet and oil outlet are facilitated, and the reliability of work and the compactness of the whole layout are ensured.
As a preferable or alternative implementation manner, the lower end of the support arm 300 is hinged with a needle bearing 600, the connection structure comprises a curved boss 410, the curved boss 410 comprises a fixing part 411 and two sliding parts 412 fixed on two sides of the fixing part 411, further preferably the fixing part 411 and the sliding parts 412 are connected into a whole to ensure reliable connection and stability of integral movement, the two sliding parts 412 are in one-to-one correspondence with the two support arms 300, the fixing part 411 and the center arm 200 are fixedly connected, the sliding parts 412 are provided with curved slide ways 413 for the needle bearing 600 at the lower end of the corresponding support arm 300 to move, the two curved slide ways 413 are distributed like a splayed shape, a regression plate 420 is detachably arranged on the face of each sliding part 412, a limit slide way 421 matched with the corresponding curved slide way 413 is arranged on the back of the regression plate 420, and the needle bearing 600 at the lower end of the support arm 300 is positioned in the corresponding limit slide way 421.
The needle bearing 600 may be configured to accommodate rolling such as a roller, and is not limited to a single bearing configuration, and has good flexibility. The above-mentioned connection structure arrangement makes the connection between the support arm 300 and the center arm 200 more compact and reliable, when the center arm 200 moves, the curved boss 410 is driven to move up and down synchronously, the needle bearing 600 at the lower end of the support arm 300 slides on the corresponding curved slideway 413 all the time and is limited by the corresponding limiting chute 421, and when moving, the corresponding needle bearing 600 is driven to roll passively by the limiting chute 421, so as to drive the support arm 300 to swing.
Further, needle bearings 600 are hinged to the upper end of the center arm 200 and the upper end of the arm 300, respectively, and a protection plate 700 is further provided at the upper end of the center arm 200/the arm 300, which is distributed around the corresponding needle bearings 600.
Preferably, a limiting pin 810 is disposed at the lower end of the at least one sliding portion 412, and when the center arm 200 moves down to a preset position, the limiting pin 810 abuts against the lower end of the housing 100, so that the center arm 200 has the lowest position of moving down under the limitation of the limiting pin 810, and has the effects of vibration isolation, buffering, noise reduction, and the like.
The case can also preferably set up limit nut and plug 820 that fit with stop pin 810 on casing 100, open plug 820 can adjust or install and change stop pin 810.
A manual fine adjustment mechanism is provided on the center arm 200 in connection with the corresponding needle bearing 600.
In summary, the center frame automatically adjusts the center position of the workpiece according to the conditions of the outer circle or the swing axis of the workpiece and the like in the rotation process of the workpiece, prevents additional deformation caused by interaction between internal forces caused by the rigid support and oscillation of the whole system caused by the interaction, ensures constant supporting force, and ensures that the support is more stable.
The working principle of the center frame is that the center arm 200 connected with the piston shaft 510 is forced to drive the two support arms 300 to move back and forth under the action of pressure oil, the center arm 200 simultaneously drives the two support arms 300 to synchronously move, the workpiece is always controlled in a circle formed by three supporting points, when the center frame does not work, the center frame is in a non-contact state with the workpiece (according to the situation), at the moment, the piston is in an oil unloading state, the whole mechanism is controlled to be in a retracted state preferably by a spring, when the center frame is required to work (the workpiece is clamped on a machine tool), the piston is controlled by a hydraulic system, oil is injected into the movable cavity 210, the top head of the center arm 200 overcomes the elasticity of the spring, the chuck (support arm 300) of the center frame is moved to a position where the workpiece is required to be supported, the two support arms 300 support the shaft workpiece to be processed, the center arm 200 in the middle is propped against the workpiece to prevent the workpiece from transversely moving, when the center frame does not work, the diameter of the workpiece is continuously reduced, the angle between the chucks of the two support arms 300 is also reduced, the top head of the center arm 200 moves forwards and always props against the workpiece, and the workpiece is always supported by the three support heads, and the center frame is not supported by the concentric device, and the workpiece can be fully supported by the center frame.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811604848.XA CN109531187B (en) | 2018-12-26 | 2018-12-26 | Built-in self-centering steady rest |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811604848.XA CN109531187B (en) | 2018-12-26 | 2018-12-26 | Built-in self-centering steady rest |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109531187A CN109531187A (en) | 2019-03-29 |
| CN109531187B true CN109531187B (en) | 2024-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811604848.XA Active CN109531187B (en) | 2018-12-26 | 2018-12-26 | Built-in self-centering steady rest |
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| Country | Link |
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| CN (1) | CN109531187B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110842594B (en) * | 2019-12-11 | 2024-12-03 | 郑州恒天重型装备有限公司 | A machine tool and its self-centering center frame |
| CN112318153A (en) * | 2020-12-17 | 2021-02-05 | 宁波市精恒凯翔机械有限公司 | A lengthened roller type lathe center frame |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4546681A (en) * | 1982-11-15 | 1985-10-15 | Owsen Paul J | Multi-purpose steady rest |
| SU1337228A1 (en) * | 1986-01-21 | 1987-09-15 | Дальневосточный политехнический институт им.В.В.Куйбышева | Hydraulic follow-rest |
| CN106584136A (en) * | 2016-12-28 | 2017-04-26 | 宁波市精恒凯翔机械有限公司 | Self-centering center frame |
| CN209407938U (en) * | 2018-12-26 | 2019-09-20 | 宁波市精恒凯翔机械有限公司 | Built-in centering center rest |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3544961A1 (en) * | 1985-12-19 | 1987-07-02 | Smw Spanneinrichtungen | SELF-CENTERING LUENETTE |
| US5222421A (en) * | 1992-01-24 | 1993-06-29 | Dainichi Kinzoku Kogyo Kabushiki Kaisha | Centering device |
| DE4209241A1 (en) * | 1992-03-21 | 1993-09-23 | Smw Spanneinrichtungen | LUENETTE |
| ATE429305T1 (en) * | 2007-05-26 | 2009-05-15 | Smw Autoblok Spannsysteme Gmbh | BEZEL |
| CN202053086U (en) * | 2011-04-21 | 2011-11-30 | 烟台环球数控装备有限公司 | Numerical control self-centering center frame |
| DE102012217001A1 (en) * | 2012-09-21 | 2014-03-27 | ADVO-Carillon UG (haftungsbeschränkt) | Self-centering bezel |
| CN102922311B (en) * | 2012-10-30 | 2015-09-02 | 烟台环球机床附件集团有限公司 | A kind of segmented numerical control self-centering center frame |
| CN204397378U (en) * | 2015-01-12 | 2015-06-17 | 滁州微秒精密机械有限公司 | Hydraulic self-centering centre frame |
| EP3093102B1 (en) * | 2015-05-12 | 2017-09-27 | SMW-Autoblok Spannsysteme GmbH | Stationary support |
| EP3093103B1 (en) * | 2015-05-12 | 2017-07-12 | SMW-Autoblok Spannsysteme GmbH | Stationary support |
| CN205614362U (en) * | 2016-05-16 | 2016-10-05 | 黄河科技学院 | Gripper -like lathe center holder |
-
2018
- 2018-12-26 CN CN201811604848.XA patent/CN109531187B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4546681A (en) * | 1982-11-15 | 1985-10-15 | Owsen Paul J | Multi-purpose steady rest |
| SU1337228A1 (en) * | 1986-01-21 | 1987-09-15 | Дальневосточный политехнический институт им.В.В.Куйбышева | Hydraulic follow-rest |
| CN106584136A (en) * | 2016-12-28 | 2017-04-26 | 宁波市精恒凯翔机械有限公司 | Self-centering center frame |
| CN209407938U (en) * | 2018-12-26 | 2019-09-20 | 宁波市精恒凯翔机械有限公司 | Built-in centering center rest |
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| Publication number | Publication date |
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| CN109531187A (en) | 2019-03-29 |
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