CN110450077B - A centering clamping device - Google Patents
A centering clamping device Download PDFInfo
- Publication number
- CN110450077B CN110450077B CN201910864931.9A CN201910864931A CN110450077B CN 110450077 B CN110450077 B CN 110450077B CN 201910864931 A CN201910864931 A CN 201910864931A CN 110450077 B CN110450077 B CN 110450077B
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- clamping device
- pressure
- eccentric wheel
- workpiece
- centering clamping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention relates to the technical field of clamping tools, and particularly discloses a centering clamping device. The centering clamping device comprises a bracket; the two clamping arms comprise a cross rod and a vertical rod which are connected in an L shape, and the two cross rods are respectively connected with the bracket through an elastic piece; the two pressure-bearing pieces are connected to each cross rod, and the two pressure-bearing pieces are positioned on the same side of the cross rod; the eccentric wheel is rotatably arranged on the support, the peripheral surface of the eccentric wheel is abutted to the two pressure-bearing pieces, and the eccentric wheel can press the two pressure-bearing pieces downwards, so that the elastic piece is compressed, and the two vertical rods are close to each other to clamp a workpiece. The centering clamping device is used for centering the workpiece in the process of clamping the workpiece, and the distance between the two clamping arms is adjusted according to the size of the workpiece, so that the clamping forces of the workpieces with different sizes are consistent, and the centering clamping device can stably clamp the workpiece.
Description
Technical Field
The invention relates to the technical field of clamping tools, in particular to a centering clamping device.
Background
The clamping device is essential to ensure the stability of the parts during processing. Existing clamping devices include two clamping arms and a cylinder that drives one of the clamping arms to move closer to or farther from the other clamping arm to clamp or release a workpiece.
The existing clamping device has the defects that only one clamping arm moves, the workpiece cannot be centered, the distance between the two clamping arms cannot be adjusted according to the change of the workpiece size when the workpiece is clamped, the clamping force is too large or too small, the stability of the workpiece cannot be ensured, the workpiece can be deformed even, the stability and repeatability of the production and inspection processes are affected, and the quality control of products is not facilitated.
Disclosure of Invention
The invention aims to provide a centering clamping device, which is used for centering a workpiece in the process of clamping the workpiece, adjusting the distance between two clamping arms according to the size of the workpiece, ensuring the consistency of clamping forces of the workpieces with different sizes, and enabling the centering clamping device to stably clamp the workpiece.
To achieve the purpose, the invention adopts the following technical scheme:
A centering and clamping device, comprising:
A bracket;
the two clamping arms comprise a cross rod and a vertical rod which are connected in an L shape, and the two cross rods are respectively connected with the bracket through an elastic piece;
the two pressure-bearing pieces are connected to each cross rod, and the two pressure-bearing pieces are positioned on the same side of the cross rod;
The eccentric wheel is rotatably arranged on the support, the peripheral surface of the eccentric wheel is abutted to the two pressure-bearing pieces, and the eccentric wheel can press the two pressure-bearing pieces downwards, so that the elastic piece is compressed, and the two vertical rods are close to each other to clamp a workpiece.
Preferably, the centering and clamping device further comprises a housing, at least part of the cross bars are located in the housing, each cross bar is connected with a support shaft, the support shafts are located between the elastic piece and the vertical rods, and the support shafts are rotatably connected to the side walls of the housing.
Preferably, the upper end of the vertical rod is detachably connected with a pressing block for abutting against the workpiece.
Preferably, the center line of the pressure-bearing member and the center line of the elastic member intersect and are perpendicular to each other.
Preferably, the centering and clamping device further comprises a rotating shaft rotatably connected with the bracket, and the eccentric wheel is sleeved outside the rotating shaft.
Preferably, the rotating shaft is connected with an indicator, and the indicator can indicate the rotation degree of the eccentric wheel.
Preferably, the indicator is of a cylindrical structure, and the axis of the indicator is perpendicular to the axial direction of the rotating shaft.
Preferably, the cross section of the eccentric is circular or elliptical.
Preferably, the elastic member is connected to an end of the cross bar away from the vertical bar.
Preferably, the support comprises a base and an upright post which are connected, a through hole is formed in the upright post, and the rotating shaft rotatably penetrates through the through hole.
The invention has the beneficial effects that: when the workpiece is required to be clamped, the workpiece is placed between the two vertical rods, the eccentric wheel is rotated, and the distance between the contact point of the eccentric wheel and the pressure bearing piece and the rotation center of the eccentric wheel is gradually increased in the rotation process of the eccentric wheel, so that the eccentric wheel can gradually press the pressure bearing piece. Because the downside of horizontal pole is connected in the support through the elastic component, consequently, the pressure-bearing piece receives the pressure action back, and the pressure is passed through the horizontal pole and is given the elastic component, and the elastic component compresses, and horizontal pole and the position of elastic component connection move downwards, and two montants slope and are close to each other to can clip the work piece. When the acting force between the two vertical rods and the workpiece, the pressure born by the elastic piece and the friction force between the eccentric wheel and the pressure-bearing piece reach balance, the eccentric wheel cannot rotate, and the workpiece is clamped at the moment. The centering clamping device can judge whether the workpiece is clamped by judging whether the eccentric wheel can continuously rotate or not, so that the clamping force applied to the workpieces with different sizes is consistent when the workpieces are clamped. Because the eccentric wheel is simultaneously propped against the two pressure bearing pieces, the inclination degrees of the two vertical rods in the clamping process are the same, and therefore, the two clamping arms can also center the workpiece, and the detection and effect precision of the workpiece are improved.
Drawings
FIG. 1 is a schematic view of a centering and clamping device according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a centering and clamping device according to an embodiment of the present invention with a housing removed;
FIG. 3 is a cross-sectional view of a centering grip provided by an embodiment of the present invention;
FIG. 4 is a cross-sectional view of another position of the centering grip provided by an embodiment of the present invention.
In the figure:
1.a bracket; 11. a base; 12. a column;
2. a clamping arm; 21. a cross bar; 22. a vertical rod; 23. briquetting;
3. a pressure-bearing member; 4. an eccentric wheel; 5. an elastic member; 6. a housing; 7. a support shaft; 8. a rotating shaft; 9. an indicator; 10. a handle.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.
As shown in fig. 1 and 2, the present embodiment provides a centering and clamping device for clamping a workpiece to be machined or inspected, so as to implement centering of the workpiece in the process of clamping the workpiece, and adjust the distance between two clamping arms according to the size of the workpiece, so as to ensure that the clamping forces of the workpieces with different sizes are consistent, and enable the centering and clamping device to stably clamp the workpiece. The centering clamping device provided by the embodiment comprises a shell 6, a bracket 1, two clamping arms 2, two pressure-bearing pieces 3 and an eccentric wheel 4. Wherein, two pressure-bearing pieces 3, elastic piece 5, eccentric wheel 4 and part of clamping arm 2 are all located in casing 6. The housing 6 is provided with a through hole so that the other part of the clamping arm 2 can extend out of the housing 6 to clamp a workpiece.
As shown in fig. 2 and 3, the two clamping arms 2 each include a cross bar 21 and a vertical bar 22 connected in an L-shape, and the two vertical bars 22 are respectively located at ends of the two cross bars 21 away from each other. The two crossbars 21 are each connected to the frame 1 by an elastic element 5. Each cross bar 21 is connected with one pressure bearing piece 3, and the two pressure bearing pieces 3 are positioned on the same side of the cross bar 21. The eccentric 4 is rotatably provided on the bracket 1 to rotate around the rotation center thereof. The peripheral surface of the eccentric wheel 4 is abutted against the surfaces of the two pressure-bearing pieces 3, and the eccentric wheel 4 can rotate to press down the two pressure-bearing pieces 3, so that the elastic piece 5 is compressed, and the two vertical rods 22 are inclined towards each other to be close to the clamped workpiece. Specifically, the included angle between the cross bar 21 and the vertical bar 22 may be 90 °, or may be an acute angle or an obtuse angle, as long as the cross bar 21 is pressed down at the end far from the vertical bar 22, and the two vertical bars 22 can incline and approach each other.
When the workpiece needs to be clamped, the workpiece is placed between the two vertical rods 22, the eccentric wheel 4 is rotated, and the distance between the contact point of the eccentric wheel 4 and the pressure-bearing piece 3 and the rotation center of the eccentric wheel 4 is gradually increased in the rotation process of the eccentric wheel 4, so that the eccentric wheel 4 gradually presses the pressure-bearing piece 3. Since the lower side of the cross bar 21 is connected to the bracket 1 through the elastic member 5, after the pressure bearing member 3 is acted by pressure, the pressure is transmitted to the elastic member 5 through the cross bar 21, the elastic member 5 is compressed, the position where the cross bar 21 is connected with the elastic member 5 moves downwards, and the two vertical bars 22 incline and approach each other, so that the workpiece can be clamped. When the acting force between the two vertical rods 22 and the workpiece, the pressure born by the elastic piece 5 and the friction force between the eccentric wheel 4 and the pressure-bearing piece 3 reach balance, the eccentric wheel 4 cannot rotate, and the workpiece is clamped at the moment. The clamping force of the centering clamping device can be adjusted according to specific requirements to adjust the pressure angle of the eccentric wheel 4, so that different clamping forces are achieved.
The centering clamping device in the embodiment can judge whether the workpiece is clamped by judging whether the eccentric wheel 4 can continuously rotate or not, so that the clamping forces born by the workpieces with different sizes are consistent when the workpieces are clamped, and the problem that the workpieces are deformed or clamped unstably due to overlarge or overlarge clamping forces born by the workpieces caused by different sizes of the workpieces is solved. Because the eccentric wheel 4 is simultaneously propped against the two pressure-bearing pieces 3, the inclination degrees of the two vertical rods 22 in the clamping process are the same, so that the two clamping arms 2 can also automatically center the workpiece, the coarse guiding function can be realized to a certain extent, and the detection and processing precision of the workpiece are improved. Due to the action of the elastic piece 5, the two clamping arms 2 are in a normally open state, compared with a traditional clamping device, the opening step is reduced, the time is saved, and the working efficiency is improved.
The bracket 1 comprises a base 11 and an upright post 12 which are connected, and the upright post 12 is provided with a through hole. The centering clamping device further comprises a rotating shaft 8 rotatably connected to the upright post 12, wherein the rotating shaft 8 penetrates through the through hole of the upright post 12 and can rotate relative to the through hole. The eccentric wheel 4 is sleeved outside the rotating shaft 8, so that the eccentric wheel 4 can rotate relative to the bracket 1. Further, in order to facilitate the rotation of the rotation shaft 8, a handle 10 is provided at an end of the rotation shaft 8.
Since the eccentric wheel 4 is arranged in the housing 6, the operator cannot observe the rotation degree of the eccentric wheel 4, and therefore an indicator 9 is connected to the rotating shaft 8, and the indicator 9 can indicate the rotation degree of the eccentric wheel 4. Specifically, the indicator 9 has a cylindrical structure, and the axis of the indicator 9 is perpendicular to the axial direction of the rotating shaft 8. Illustratively, when the indicator 9 is pointed upwards and in a vertical condition, the point on the eccentric 4 that is in contact with the pressure-bearing member 3 is the point closest to the centre of rotation, where the force of the eccentric 4 with the pressure-bearing member 3 is minimal or no; when the indicator 9 is directed downwards and in a vertical position, the point of contact with the pressure piece 3 on the eccentric 4 is the point furthest from the centre of rotation, where the force of the eccentric 4 against the pressure piece 3 is the greatest.
The acting force for driving the vertical rod 22 to rotate is derived from the eccentric wheel 4, and the main reason for determining the inclination degree of the vertical rod 22 is that the maximum distance and the minimum distance between the peripheral surface of the eccentric wheel 4 and the rotation center are different, so that workpieces with different sizes can be clamped by replacing different eccentric wheels 4, and the applicability of the centering clamping device is improved.
As shown in fig. 3, the center line of the pressure-bearing member 3 and the center line of the elastic member 5 intersect and are perpendicular to each other, so that when the pressure-bearing member 3 is under the same force, the elastic member 5 can have the maximum deformation, and the inclination of the vertical rod 22 can be maximized. The pressure-bearing member 3 is preferably of cylindrical configuration. The elastic member 5 is preferably a spring, and of course, the elastic member 5 may be a rubber column, a spring plate, or the like.
Further, in order to allow the elastic member 5 to be inclined at the maximum angle under the same compression amount, the elastic member 5 is connected to the end of the cross bar 21 away from the vertical member 22.
As shown in fig. 1 and 3, in order to improve the stability of the rotation of the vertical rod 22, in the present embodiment, a support shaft 7 is provided on the clamp arm 2. Specifically, at least part of the cross bars 21 are located in the housing 6, each cross bar 21 is connected with a supporting shaft 7, the supporting shafts 7 are rotatably connected to the side walls of the housing 6, and the supporting shafts 7 are located between the elastic pieces 5 and the vertical rods 22, so that the clamping arms 2 rotate around the supporting shafts 7 relative to the housing 6 by utilizing the lever principle, and the stability of rotation of the vertical rods 22 is improved.
The upper end of the vertical rod 22 is detachably connected with a pressing block 23, so that workpieces with different shapes can be adapted by changing the pressing blocks 23 with different shapes, and the clamping stability and the applicability of the device are improved.
As shown in fig. 4, specifically, in order to gradually press down the pressure-bearing member 3 during the rotation of the eccentric 4, the cross section of the eccentric 4 is circular or elliptical, and when the cross section of the eccentric 4 is circular, the center of the circle is spaced from the center of rotation of the eccentric 4; when the cross section of the eccentric 4 is elliptical, the center of the ellipse coincides with the center of rotation of the eccentric 4.
The working process of the centering and clamping device provided by the embodiment is as follows:
1. The workpiece is placed, the handle 10 is rotated in one direction (e.g. clockwise), and after the pressing block 23 contacts the workpiece, the handle 10 is slowly rotated, so that the eccentric wheel 4 is completely fixed and does not rotate any more, which means that the workpiece is clamped at this time.
2. And carrying out subsequent detection or processing work.
3. After the inspection or machining work is completed, the handle 10 is turned slightly in the opposite direction (counterclockwise direction), and when the friction force between the eccentric wheel 4 and the bearing member 3 is smaller than the elastic force of the elastic member 5, the two clamping arms 2 are automatically opened. It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910864931.9A CN110450077B (en) | 2019-09-12 | 2019-09-12 | A centering clamping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910864931.9A CN110450077B (en) | 2019-09-12 | 2019-09-12 | A centering clamping device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110450077A CN110450077A (en) | 2019-11-15 |
| CN110450077B true CN110450077B (en) | 2024-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910864931.9A Active CN110450077B (en) | 2019-09-12 | 2019-09-12 | A centering clamping device |
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| CN (1) | CN110450077B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111823597B (en) * | 2020-06-28 | 2022-08-02 | 宁夏隆基宁光仪表股份有限公司 | Frame positioning and clamping integrated device for mechanical automation assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105215887A (en) * | 2015-10-30 | 2016-01-06 | 重庆市璧山县振昌汽车配件有限公司 | The linkage clamp device of brake rim |
| CN210499950U (en) * | 2019-09-12 | 2020-05-12 | 上海精智实业股份有限公司 | Centering clamping device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10180580A (en) * | 1996-12-25 | 1998-07-07 | Toyota Motor Corp | Clamping device |
| JP6036725B2 (en) * | 2013-07-18 | 2016-11-30 | Smc株式会社 | Clamping device |
| FI125718B (en) * | 2014-01-22 | 2016-01-29 | Exact Tools Oy | Apparatus for handling tubular or round bar-like bodies |
| CN204431095U (en) * | 2014-12-13 | 2015-07-01 | 重庆中重石油机械有限公司 | Mechanical type oil pipe pressure test fixture |
| CN105269488A (en) * | 2015-10-30 | 2016-01-27 | 重庆市长寿区怡美饰品加工坊 | Cam-type clamping device for processing accessories |
-
2019
- 2019-09-12 CN CN201910864931.9A patent/CN110450077B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105215887A (en) * | 2015-10-30 | 2016-01-06 | 重庆市璧山县振昌汽车配件有限公司 | The linkage clamp device of brake rim |
| CN210499950U (en) * | 2019-09-12 | 2020-05-12 | 上海精智实业股份有限公司 | Centering clamping device |
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| Publication number | Publication date |
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| CN110450077A (en) | 2019-11-15 |
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Application publication date: 20191115 Contract record no.: X2026980001614 Denomination of invention: A centering and clamping device Granted publication date: 20240906 License type: Common License Record date: 20260121 |