CN110480373A - A kind of spring collet mechanism for Fast Installation axial workpiece - Google Patents
A kind of spring collet mechanism for Fast Installation axial workpiece Download PDFInfo
- Publication number
- CN110480373A CN110480373A CN201910682963.7A CN201910682963A CN110480373A CN 110480373 A CN110480373 A CN 110480373A CN 201910682963 A CN201910682963 A CN 201910682963A CN 110480373 A CN110480373 A CN 110480373A
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- China
- Prior art keywords
- spring collet
- spring
- axial workpiece
- lock tube
- rotary sleeve
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Classifications
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- 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
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention discloses a kind of spring collet mechanisms for Fast Installation axial workpiece, comprising: pedestal, rotary sleeve, pushing block, several short mandrils, long mandril；First clamping component, including the first fixed lock tube, the first spring collet, the second clamping component, including the second fixed lock tube, second spring collet and several reset springs and straight line cylinder, straight line cylinder is when retracting, the first spring collet and second spring collet restore under reset spring promotion to the clamped condition to axial workpiece, wherein, the rotary sleeve drives the first spring collet and second spring collet in rotation while rotating.Spring collet mechanism of the invention passes through two groups of clamping components of setting, it can guarantee being fixedly clamped for axial workpiece, while improve the concentricity of axial workpiece installation, pass through the cooperation of rotary sleeve and clamping component, it can be screwed while clamping axial workpiece, complete matching requirements.
Description
Technical field
The present invention relates to gearboxes to install auxiliary mould field, and in particular to a kind of bullet for Fast Installation axial workpiece
Spring collet mechanism.
Background technique
In the measurement of gearbox shafting, needs manually or mechanical system screwing tool bolt reduces and cooperates with axis
Size, to realize the Quick-clamped function of axis.
At present in mechanical system, has and realize axis clamping measurement function using measuring machine, still, since measuring machine wants refinement
Degree is higher, and such mode, which will cause, assembles the problems such as time-consuming, can impact to beat, cost, manpower.
In mechanical system clamping, also two valve clamping components are pulled to realize clamping function using cylinder, but two valves press from both sides
Tight component is not easy to synchronize, and is easy to produce eccentric phenomenon, and which precision is low, is unable to reach the required precision of measuring machine.
In addition, although the technology of existing artificial clamp shaft is simple, since gear-box production line beat is fast, do not have
The excessive time allows and manually clamps workpiece by twisting bolt mode, and working efficiency is low in assembling process, during manual assembly
It has and assembles the problems such as time-consuming, beat, cost, manpower can be impacted.
Summary of the invention
To overcome the shortcomings of existing technologies, the purpose of the present invention is to provide a kind of bullets for Fast Installation axial workpiece
Spring collet mechanism to realize the assembling function of simple and fast clamping axial workpiece, while improving the coaxial of axial workpiece installation
Degree.
The present invention solves technical problem and adopts the following technical scheme that
The invention proposes a kind of spring collet mechanisms for Fast Installation axial workpiece, comprising: pedestal, for rank
The body structure of terraced axis hole；Rotary sleeve is mounted in the pedestal by bearing；Pushing block, be arranged in the rotary sleeve and with
The rotary sleeve is in axial sliding connection, and front end is equipped with several short mandrils and long mandril in the axial direction；First clamping component, including
First spring collet of the first fixation lock tube and the first fixed lock tube cooperation that are fixedly connected with the rotary sleeve inner ring,
And several reset springs；Second clamping component, the second fixed lock tube including being fixedly connected with the rotary sleeve inner ring, setting
Second spring collet and several reset springs in the second fixed lock tube；And straight line cylinder, for pushing the pushing block
It slides axially along the rotary sleeve, wherein first clamping component and the second clamping component are for clamping axial workpiece not
Coaxial position, the straight line cylinder force first spring when the short mandril and long mandril for pushing pushing block move forward simultaneously
Collet and second spring collet discharge clamped axial workpiece, and the straight line cylinder is when retracting, first bullet
Spring collet and second spring collet restore under reset spring promotion to the clamped condition to axial workpiece, wherein the rotation
It covers and drives the first spring collet and second spring collet in rotation while rotating.
Further, the first fixing lock set has the first circular cone locking face, the first spring collet front end setting
There are several first elastic clips, first elastic clip is matched with the first circular cone locking face.
Further, the described first fixed lock tube, the described second inner ring for fixing lock tube are provided with several limiting slots, described
First spring collet, the second spring collet outer ring be provided with several limited blocks, wherein the limiting slot is to the limit
Block has circumferential position-limiting action.
Further, between the first spring collet and the first fixed lock tube, the second spring collet and described the
Spring retainer column is respectively equipped between two fixed lock tubes, wherein the spring retainer column is arranged in the reset spring.
Further, the bearing includes first bearing and second bearing, is equipped on the outside of the first bearing and compresses end cap,
The compression end cap is fixedly connected with the base, and for the axially position of first bearing, the compression end outer side of lid is provided with
Close to switch.
Further, the second bearing side is equipped with the relocation mechanism being made of thrust block pad and compressed spring, described floating
Motivation structure is used to carry out axial floating limit to second bearing.
It further, further include the ring flange being connect with the rotary sleeve, wherein the ring flange outer end is fixed with band
Wheel.
Further, for gearbox shafting measurement when in gearbox be mounted axis clamping and screw.
Compared with prior art, beneficial effects of the present invention:
1, spring collet mechanism of the invention passes through two groups of clamping components of setting, it is ensured that the clamping of axial workpiece is solid
It is fixed, while the concentricity of axial workpiece installation is improved, by the cooperation of rotary sleeve and clamping component, axial workpiece can clamped
While it is screwed, complete matching requirements.
2, the present invention can quickly and easily complete the assembly clamping function of axial workpiece by spring collet mechanism, pass through
Belt wheel, straight line cylinder and close to the semi-automatic control between switch, effective solution that can be simple and quick are grasped because of tooling
Work is slower, and station efficiency greatly improved in problem caused by low precision.
3, it by setting relocation mechanism, can prevent stuck because of axial stress effect in rotary sleeve rotary course.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of internal structure of the spring collet mechanism for Fast Installation axial workpiece of the invention；
Fig. 2 is the external perspective structural representation of the spring collet mechanism for Fast Installation axial workpiece of the invention；
Fig. 3 is the spring collet mechanism broken section structural schematic diagram for Fast Installation axial workpiece of the invention；
Fig. 4 is the structural representation of pushing block and mandril in the spring collet mechanism for Fast Installation axial workpiece of the invention
Figure；
Fig. 5 is that the structure of the first fixed lock tube in the spring collet mechanism for Fast Installation axial workpiece of the invention is shown
It is intended to；
Fig. 6 be Fig. 5 A-A to schematic cross-sectional view；
Fig. 7 is that the structure of the first spring collet in the spring collet mechanism for Fast Installation axial workpiece of the invention is shown
It is intended to；
Fig. 8 is the B-B direction schematic cross-sectional view of Fig. 7；
Fig. 9 is that the structure of the second fixed lock tube in the spring collet mechanism for Fast Installation axial workpiece of the invention is shown
It is intended to；
Figure 10 is the C-C of Fig. 9 to schematic cross-sectional view；
Figure 11 is the structure of second spring collet in the spring collet mechanism for Fast Installation axial workpiece of the invention
Schematic diagram；And
Figure 12 is the D-D of Figure 11 to schematic cross-sectional view.
Description of symbols
1, pedestal；2, long mandril；3, rotary sleeve；4, the second fixed lock tube；5, second spring collet；6, pushing block；7, first
Spring collet；8, the first fixed lock tube；9, thrust block pad；10, ring flange；11, end cap is compressed；12, first bearing；13, belt wheel；
14, close to switch；15, caging bolt；16, straight line cylinder；17, short mandril；18, reset spring；19, compressed spring；20, block
Spring；21, spring retainer column；22, second bearing；41, spring mounting hole；42, the second circular cone locking face；51, the second elastic clip；
52, spring mounting hole；71, the first elastic clip；72, escape groove；81, through-hole；82, the first circular cone locking face；83, spring is installed
Hole；100, it is mounted axis.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1-Figure 12 is shown according to some embodiments of the present invention.
As shown in Figure 1-3, a kind of spring collet mechanism for Fast Installation axial workpiece, is used for Quick-clamped axis class zero
Part simultaneously carries out it to screw installation, and the spring collet mechanism includes: pedestal 1, rotary sleeve 3, ring flange 10, two bearings, band
Wheel 13 etc., pedestal 1 are in body structure, and middle part offers ladder axis hole, and rotary sleeve 3 is mounted on the rank of pedestal 1 by two bearings
In terraced axis hole.
It is equipped on the outside of one end of rotary sleeve 3 and compresses end cap 11, compressed end cap 11 and 1 end of pedestal is bolted company
It connects, by compressing the first bearing 12 close to 3 lateral ends of rotary sleeve, axial limiting is carried out to rotary sleeve 3, is mounted on rotary sleeve
22 side of second bearing of 3 other ends is equipped with the relocation mechanism being made of thrust block pad 9 and compressed spring 19, the relocation mechanism peace
In pedestal 1, for carrying out floating axial limiting to second bearing 22, avoid in 3 rotary course of rotary sleeve because bearing by
Axial stress is stuck and can not operate.
Specifically, ring flange 10 is bolted on 3 rear end of rotary sleeve, and the axle portion of 10 outer end of ring flange is fixedly installed with
Belt wheel 13, belt wheel 13 are axially fixed on ring flange 10 by circlip 20, and belt wheel 13 can drive rotation driven by the motor
3 rotation of set.Wherein, 10 middle part of ring flange offers through-hole in the axial direction, and straight line cylinder 16 is equipped in the through-hole.
Specifically, it is equipped with pushing block 6 in the rotary sleeve 3 inside 10 one end of ring flange, the pushing block 6 is in straight line cylinder
It can be slided in rotary sleeve 3 under 16 promotion, wherein 6 other end of pushing block is arranged in the axial direction there are six short 17 He of mandril
Six long mandril 2, short mandril 17 and long mandril 2 are arranged around 6 end face annular of pushing block, and short mandril 17 is spaced apart with long mandril 2.
Specifically, as shown in Figure 3,4,17 front end of short mandril is equipped with the first clamping component and the second clamping component, and
The front end of the first clamping component is arranged in second clamping component.
Wherein, the first clamping component includes the first fixed lock tube 8 and the first spring collet 7, and described first fixes lock tube 8
The inner hole of external cylindrical surface and the rotary sleeve 3 is interference fitted, and the first spring collet 7 is mounted in the first fixed lock tube 8, In
It can slide axially in the first fixed lock tube 8 under the promotion of short mandril 17, wherein the circular hole front end tool of the first fixed lock tube 8
There is the first circular cone locking face 82, the first circular cone locking face 82 and the first fixed 8 central axis of lock tube are in certain inclination angle, and described the
One spring collet, 7 front end is provided with six piece of first elastic clip 71, and the lateral surface of first elastic clip 71 is also circular cone
Face is matched with the first circular cone locking face 82 inside the first fixed lock tube 8.
Wherein, the first fixed lock tube 8 is equipped with multiple spring mounting holes 83, is equipped with spring retainer on spring mounting hole 83
Column 21, spring retainer column 21 are arranged with reset spring 18 outside；When the first spring collet 7 is in the active force for being not affected by short mandril 17
When, reset spring 18 pushes the first spring collet 7 to slide from inside to outside in the first fixed lock tube 8, first on the first spring collet 7
Extruding of the elastic clip 71 by the first circular cone locking face 82 on the first fixed lock tube 8, internally tightens, axis class zero may be implemented
The clamping of part.
When short mandril 17 pushes the first spring collet 7 slid inward in the first fixed lock tube 8, the first elastic clip 71
Active force by the first circular cone locking face 82 in the first fixed lock tube 8 reduces, even without the first elastic clip 71 is opened outward
It opens, so as to realize the installation or disassembly of axial workpiece.
Specifically, as shown in Figure 5,6, the second clamping component includes the fixed lock tube 4 of second spring collet 5, second, and second is solid
Lock set 4 is arranged in rotary sleeve 3, and can be rotated synchronously with rotary sleeve 3, described second with rotary sleeve 3 by interference fit
Spring collet 5 is slidably mounted in the second fixed lock tube 4, wherein is locked with the second circular cone the circular hole front end of the second fixed lock tube 4
Tight face 42, the front end tool of second spring collet 5 is there are six the second elastic clip 51, and the lateral surface of second elastic clip 51
For circular conical surface, matched with the second circular cone locking face 42 inside the second fixed lock tube 4.
Wherein, second spring collet 5 is equipped with spring mounting hole 52, also is provided with spring mounting hole on the second fixed lock tube 4
41, spring retainer column 21 is provided between two spring mounting holes, and reset spring 18, spring limit are provided on spring retainer column 21
Position column 21 is opened up on the first fixed lock tube 8 for preventing reset spring 18 from deforming by 6 through-holes, is arranged on the first spring collet 7
There is escape groove 72, the long mandril 2 on pushing block 6 can pass through on through-hole 81 and the first spring clip set on the first fixed lock tube 8
Escape groove 72 resists the end face of second spring collet 5.
Wherein, when second spring collet 5 is not affected by long 2 thrust of mandril, reset spring 18 pushes second spring folder
Set 5 slides in and out in the second fixed lock tube 4, and the second elastic clip 51 on second spring collet 5 is by the second fixed lock tube 4
The extruding of upper second circular cone locking face, internally tightens, and the clamping of axial workpiece may be implemented.
When second spring collet 5 is by long 2 thrust of mandril, reset spring 18 compresses, and second spring collet 5 is the
Two fix slid inward in lock tubes 4, and second circular cone locking face is to the second bullet on second spring collet 5 on the second fixed lock tube 4
The active force of property intermediate plate 51 reduces gradually, and the second elastic clip 51 is flared out, so as to realize axial workpiece installation or
Person's disassembly.
Specifically, the outside for compressing end cap 11 is equipped with close to switch 14, described close to switch 14, straight line cylinder
16 and the motor of belt wheel 13 of driving connect with controller signals, for controlling the work of belt wheel 13 and straight line cylinder 16
Sequentially.
In one embodiment, the first fixed lock tube, the second inner ring for fixing lock tube are provided with several limiting slots, the first spring
Collet, second spring collet outer ring be provided with several limited blocks, limited block is matched with limiting slot, and it is fixed to can be realized first
Circumferential the limiting of lock tube and the fixed lock tube of the first spring collet, second spring collet and second, during screwing axial workpiece,
It can prevent the sliding of axial workpiece.
In one embodiment, pushing block 6 is fixedly installed with caging bolt 15, the caging bolt close to 16 one end of straight line cylinder
15 is opposite with the cylinder rod of straight line cylinder, can reduce cylinder to the impact wear of pushing block 6.
The course of work of spring collet mechanism for Fast Installation axial workpiece of the invention is as follows:
Firstly, clamped axial workpiece close to the mechanism, compresses and detects axis class zero close to switch 14 on end cap 11
Part is close, sends a signal to controller, and controller controls straight line cylinder work, and the cylinder rod of straight line cylinder withstands the limit on pushing block
Position bolt 15, and push pushing block 6 mobile, the short mandril 17 on pushing block 6 pushes the first spring collet 7 in the first fixed lock tube 8
Sliding, the active force that the first fixed lock tube 8 covers upper first elastic clip to the first spring clip slowly become smaller, and make the first elastic clip
Piece is slowly flared out, and reaches the size requirement that can place mounted axis 100, while the long mandril on pushing block 6 pushes second
Spring collet 5 moves in the second fixed lock tube, and the second fixed 4 inside conical bore of lock tube is to the second elasticity on second spring collet
The active force of intermediate plate slowly reduces, and the second elastic clip is made to start to be flared out, and reaches the size that can place mounted axis 100
It is required that.
Then, when being completely installed in the mechanism wait be mounted axis 100, straight line cylinder stops working, the first spring collet
It retracts under the promotion of reset spring 18 with second spring collet, exists since the first spring clip covers upper first elastic clip backward
To contract under the circular conical surface extruding of first fixed lock tube, it is mounted axis 100 to clamp, similarly, on second spring collet
Second elastic clip, to contract, mounted axis 100 is clamped under the extruding that the second fixing lock covers upper circular conical surface.
Finally, controller is rotated by motor driven belt wheel 13 after being mounted axis 100 and being clamped, belt wheel 13 drives method
Blue disk, rotary sleeve and the pushing block 6 being mounted in rotary sleeve, the first spring collet, the first fixed lock tube, second spring collet,
Second fixes lock tube rotation, is mounted the rotation of axis 100, so that the mounted axis 100 of realization screws installation.
Application example
This spring collet mechanism be used for gearbox shafting measurement when in gearbox be mounted axis 100 Quick-clamped and
It screws, effective solution is slower because tooling operates, and station efficiency greatly improved in problem caused by low precision.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of spring collet mechanism for Fast Installation axial workpiece characterized by comprising
Pedestal (1), for the body structure with ladder axis hole；
Rotary sleeve (3) is mounted in the pedestal (1) by bearing；
Pushing block (6), setting are in axial sliding connection in the rotary sleeve (3) and with the rotary sleeve (3), and front end is in the axial direction
Equipped with several short mandrils (17) and long mandril (2)；
First clamping component, including first fixed lock tube (8) being fixedly connected with the rotary sleeve (3) inner ring and described first
The first spring collet (7) and several reset springs (18) of fixed lock tube (8) cooperation；
Second clamping component, second including being fixedly connected with the rotary sleeve (3) inner ring fixes lock tube (4), is arranged second
Second spring collet (5) and several reset springs (18) in fixed lock tube (4)；And
Straight line cylinder (16), for pushing the pushing block (6) to slide axially along the rotary sleeve (3),
Wherein, first clamping component and the second clamping component are used to clamp the axially different position of axial workpiece, described straight
Line cylinder (16) forces the first spring collet when the short mandril (17) and long mandril (2) for pushing pushing block (6) move forward simultaneously
(7) clamped axial workpiece is discharged with second spring collet (5), the straight line cylinder (16) is described when retracting
First spring collet (7) and second spring collet (5) restore in the case where reset spring (18) push to the clamping shape to axial workpiece
State,
Wherein, the rotary sleeve (3) drives the first spring collet (7) and second spring collet (5) in rotation while revolving
Turn.
2. the spring collet mechanism according to claim 1 for Fast Installation axial workpiece, which is characterized in that described
One fixed lock tube (8) have the first circular cone locking face (82), and the first spring collet (7) front end is provided with several first elasticity
Intermediate plate (71), first elastic clip (71) match with the first circular cone locking face (82).
3. the spring collet mechanism according to claim 2 for Fast Installation axial workpiece, which is characterized in that described
One fixes lock tube (8), the inner ring of second fixed lock tube (4) is provided with several limiting slots, the first spring collet (7),
The outer ring of the second spring collet (5) is provided with several limited blocks, wherein the limiting slot has the limited block circumferential
Position-limiting action.
4. the spring collet mechanism according to claim 1 for Fast Installation axial workpiece, which is characterized in that described
Between one spring collet (7) and first fixed lock tube (8), the second spring collet (5) and second fixed lock tube (4) it
Between be respectively equipped with spring retainer column (21), wherein the spring retainer column (21) setting is in the reset spring (18).
5. the spring collet mechanism according to claim 1 for Fast Installation axial workpiece, which is characterized in that the axis
It contracts and includes first bearing (12) and second bearing (22), be equipped on the outside of the first bearing (12) and compress end cap (11), the pressure
Tight end cap (11) is fixedly connected with the pedestal (1), is used for the axially position of first bearing (12), the compression end cap (11) is outside
Side is provided with close to switch (14).
6. the spring collet mechanism according to claim 5 for Fast Installation axial workpiece, which is characterized in that described
Two bearings (22) side is equipped with the relocation mechanism that is made of thrust block pad (9) and compressed spring (19), and the relocation mechanism is used for pair
Second bearing (22) carries out axial floating limit.
7. the spring collet mechanism according to claim 1 for Fast Installation axial workpiece, which is characterized in that further include
The ring flange (10) being connect with the rotary sleeve (3), wherein ring flange (10) outer end is fixed with belt wheel (13).
8. the spring collet mechanism according to claim 1 for Fast Installation axial workpiece, which is characterized in that be used for
Gearbox shafting measure when in gearbox be mounted axis (100) clamping and screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910682963.7A CN110480373B (en) | 2019-07-26 | 2019-07-26 | Spring jacket mechanism for rapidly installing shaft parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910682963.7A CN110480373B (en) | 2019-07-26 | 2019-07-26 | Spring jacket mechanism for rapidly installing shaft parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110480373A true CN110480373A (en) | 2019-11-22 |
| CN110480373B CN110480373B (en) | 2021-06-04 |
Family
ID=68548532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910682963.7A Active CN110480373B (en) | 2019-07-26 | 2019-07-26 | Spring jacket mechanism for rapidly installing shaft parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110480373B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111673490A (en) * | 2020-05-07 | 2020-09-18 | 安徽工程大学 | Clamp stable in clamping |
| CN112427981A (en) * | 2020-10-29 | 2021-03-02 | 锦州美联桥汽车部件有限公司 | Automatic pipe end clamping device of spiral forming machine |
| CN114393499A (en) * | 2021-12-13 | 2022-04-26 | 赫比（上海）家用电器产品有限公司 | Displacement support piece, shaft holding clamp displacement follow-up support mechanism and use method |
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| US5070592A (en) * | 1989-09-22 | 1991-12-10 | Hokoku Machinery Co. Ltd. | Spindle unit of a machine tool in which tools changing is available |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111673490A (en) * | 2020-05-07 | 2020-09-18 | 安徽工程大学 | Clamp stable in clamping |
| CN111673490B (en) * | 2020-05-07 | 2021-10-15 | 安徽工程大学 | Clamp stable in clamping |
| CN112427981A (en) * | 2020-10-29 | 2021-03-02 | 锦州美联桥汽车部件有限公司 | Automatic pipe end clamping device of spiral forming machine |
| CN114393499A (en) * | 2021-12-13 | 2022-04-26 | 赫比（上海）家用电器产品有限公司 | Displacement support piece, shaft holding clamp displacement follow-up support mechanism and use method |
| CN114393499B (en) * | 2021-12-13 | 2022-11-15 | 赫比（上海）家用电器产品有限公司 | Displacement support piece, shaft holding clamp displacement follow-up support mechanism and use method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110480373B (en) | 2021-06-04 |
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