CN116441583A - Self-centering tensioning mechanism - Google Patents
Self-centering tensioning mechanism Download PDFInfo
- Publication number
- CN116441583A CN116441583A CN202310492903.5A CN202310492903A CN116441583A CN 116441583 A CN116441583 A CN 116441583A CN 202310492903 A CN202310492903 A CN 202310492903A CN 116441583 A CN116441583 A CN 116441583A
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- China
- Prior art keywords
- conical surface
- centering
- self
- tensioning mechanism
- cavity
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- 238000009434 installation Methods 0.000 claims abstract description 7
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/40—Expansion mandrels
- B23B31/404—Gripping the work or tool by jaws moving radially controlled by conical surfaces
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
Abstract
The invention relates to a self-centering tensioning mechanism. The invention comprises a body, wherein an installation cavity is arranged along the axial direction of the body, and a plurality of grooves communicated with the installation cavity are arranged along the circumferential direction of the body; the centering mandrel is axially and movably connected with the mounting cavity, and at least one pushing inclined plane is axially arranged along the centering mandrel; the inclined wedge block is arranged in the mounting cavity and beside each groove, and comprises a driven inclined surface in sliding fit with the pushing inclined surface; the ejector rod is axially and movably connected with the mounting cavity and is used for driving the centering mandrel to axially move along the mounting cavity; the elastic piece is arranged between the body and the inclined wedges and is used for providing force for the inclined wedges to move along the radial direction in the groove; wherein, the axial movement of the centering mandrel can be converted into radial movement of the plurality of wedge blocks along the outside of the groove. The invention can be used for turning or grinding the inner circle of the sleeve part for clamping the thin wall, and effectively solves the problem of positioning, clamping and deformation of the part.
Description
Technical Field
The invention relates to the technical field of tool clamps, in particular to a self-centering tensioning mechanism.
Background
The processing of thin-wall sleeve parts with roundness, coaxiality and ellipticity is difficult, and due to the poor rigidity of the parts, the traditional expansion sleeve is adopted for positioning and clamping, so that the problems of small contact area and uneven stress exist between the parts, and after the expansion is released, the parts can be elastically deformed at the corresponding stress positions, so that the precision requirement of the parts is not met.
Disclosure of Invention
In order to solve the technical problems, the invention provides a self-centering tensioning mechanism which can be used for turning or grinding the inner circle of a sleeve part for clamping a thin wall and effectively solves the problem of positioning, clamping and deformation of the part.
To this end, the present invention provides a self-centering tensioning mechanism comprising:
the device comprises a body, a plurality of mounting cavities and a plurality of grooves, wherein the mounting cavities are arranged along the axial direction of the body, and the grooves are communicated with the mounting cavities;
the centering mandrel is axially and movably connected with the mounting cavity, and at least one pushing inclined plane is axially arranged along the centering mandrel;
the inclined wedge block is arranged in the mounting cavity and beside each through groove, and comprises a driven inclined surface in sliding fit with the pushing inclined surface;
the ejector rod is axially and movably connected with the mounting cavity and is used for driving the centering mandrel to axially move along the mounting cavity;
the elastic piece is arranged between the body and the inclined wedges and is used for providing force for the inclined wedges to move along the radial direction in the through groove;
the axial movement of the centering mandrel can be converted into radial movement of the wedge blocks along the outside of the through groove.
In one embodiment of the invention, the mounting cavity comprises a via hole, a driving cavity and a sliding cavity, wherein the driving cavity and the sliding cavity are respectively arranged on the upper side and the lower side of the via hole, a driving spring is arranged in the driving cavity, the ejector rod is movably arranged in the driving cavity through the driving spring, the ejector rod penetrates through the via hole and is connected with the centering mandrel, and the centering mandrel is connected with the sliding cavity in a sliding manner.
In one embodiment of the present invention, the pushing inclined plane is a conical surface, and the driven inclined plane is an inclined plane or a partial conical surface matched with the conical surface.
In one embodiment of the present invention, a first cylinder, a first cone connected to the first cylinder, a second cylinder connected to the first cone, and a second cone connected to the second cylinder are sequentially disposed along an axial direction of the centering mandrel, the pushing inclined plane includes a first conical surface disposed on the first cone and a second conical surface disposed on the second cone, respective inclination directions and inclination angles of the first conical surface and the second conical surface are the same, and respective diameters of the first cylinder and the second cylinder are equal.
In one embodiment of the invention, the respective diameters of the first and second vertebral bodies decrease gradually in a direction away from the ejector pin.
In one embodiment of the present invention, the driven inclined surface includes a first conical surface and a second conical surface, the wedge includes a block, and the first conical surface and the second conical surface are provided on the block, and each of the first conical surface and the second conical surface has the same inclination direction and inclination angle, and the first conical surface are abutted, and the second conical surface are abutted.
In one embodiment of the invention, the side of the block facing the through groove is an arc surface and is embedded with an alloy layer.
In one embodiment of the invention, a first circular arc groove and a second circular arc groove are arranged along the upper end and the lower end of the inclined wedge, a first annular groove corresponding to the first circular arc groove and a second annular groove corresponding to the second circular arc groove are arranged on the upper side wall and the lower side wall of the body, and the elastic piece comprises a first annular spring arranged between the first annular groove and the first circular arc groove and a second annular spring arranged between the second annular groove and the second circular arc groove.
In one embodiment of the present invention, the plurality of through slots are uniformly distributed in the circumferential direction of the body and have an even number.
In one embodiment of the invention, a threaded connection hole is formed in the top end of the centering mandrel, and the ejector rod is in threaded connection with the centering mandrel through the threaded connection hole.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the self-centering tensioning mechanism, the plurality of telescopic wedge blocks are arranged around the main body, so that the positioning clamping contact area with a machined part is increased, and the clamping deformation of the machined part is reduced; the telescopic wedge blocks are symmetrically distributed, so that the stress of the clamped part is uniform, and the cutting stability is good; different materials can be embedded in the inclined wedge block, so that the processing of sleeve parts with different materials can be adapted, and the problems of scratching, crushing and the like are avoided.
The invention has simple structure, is convenient to assemble, disassemble and maintain, is used for turning or grinding the inner circle of the sleeve part for clamping the thin wall, and effectively solves the problem of positioning, clamping and deformation of the part.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.
FIG. 1 is a schematic view of a self-centering tensioning mechanism of the present invention.
Fig. 2 is a front cross-sectional view of the self-centering tensioning mechanism of the present invention.
Fig. 3 is a top cross-sectional view of the self-centering tensioning mechanism of the present invention.
Fig. 4 is a front cross-sectional view of the self-centering tensioning mechanism body of the present invention.
Fig. 5 is a top cross-sectional view of the self-centering tensioning mechanism body of the present invention.
FIG. 6 is a cross-sectional view of a centering mandrel of the self-centering tensioning mechanism of the present invention.
FIG. 7 is a schematic view of a wedge of the self-centering tensioning mechanism of the present invention.
Description of the specification reference numerals:
1. a body; 1.1, a via hole; 1.2, a driving cavity; 1.3, sliding cavity; 1.4, a first annular groove; 1.5, through grooves; 1.6, a second annular groove; 2. centering the mandrel; 2.1, a threaded connecting hole; 2.2, a first cylinder; 2.3, a first vertebral body; 2.4, a second vertebral body; 2.5, a second cylinder; 3. a push rod; 4. a drive spring; 51. an annular spring; 52. an annular spring; 6. wedge block; 6.1, a first arc groove; 6.2, a second arc groove; 6.3, a first conical surface; 6.4, a second conical surface; 7. an alloy layer; 8. parts.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
In the present invention, if directions (up, down, left, right, front and rear) are described, they are merely for convenience of description of the technical solution of the present invention, and do not indicate or imply that the technical features must be in a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, "a plurality of" means one or more, and "a plurality of" means two or more, and "greater than", "less than", "exceeding", etc. are understood to not include the present number; "above", "below", "within" and the like are understood to include this number. In the description of the present invention, the description of "first" and "second" if any is used solely for the purpose of distinguishing between technical features and not necessarily for the purpose of indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the present invention, unless clearly defined otherwise, terms such as "disposed," "mounted," "connected," and the like should be construed broadly and may be connected directly or indirectly through an intermediate medium, for example; the connecting device can be fixedly connected, detachably connected and integrally formed; can be mechanically connected, electrically connected or capable of communicating with each other; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the invention can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Referring to fig. 1 to 7, a self-centering tensioning mechanism of the present invention comprises:
the device comprises a body 1, wherein an installation cavity is arranged along the axial direction of the body 1, and a plurality of grooves communicated with the installation cavity are arranged along the circumferential direction;
the centering mandrel 2 is axially and movably connected with the mounting cavity, and at least one pushing inclined plane is axially arranged along the centering mandrel 2;
the inclined wedge blocks 6 are arranged in the mounting cavity and beside each through groove 15, and the inclined wedge blocks 6 comprise driven inclined planes which are in sliding fit with the pushing inclined planes;
the ejector rod 3 is axially and movably connected with the mounting cavity and is used for driving the centering mandrel 2 to axially move along the mounting cavity;
an elastic member, disposed between the body 1 and the plurality of wedges 6, for providing a force for moving the plurality of wedges 6 along a radial direction in the through slot 15;
the axial displacement of the centering mandrel 2 can be converted into a radial displacement of the plurality of wedges 6 out of the through-slot 15.
Specifically, the installation cavity comprises a through hole 11, a driving cavity 12 and a sliding cavity 13, wherein the driving cavity 12 and the sliding cavity 13 are respectively arranged on the upper side and the lower side of the through hole 11, a driving spring 4 is arranged in the driving cavity 12, the ejector rod 3 is movably arranged in the driving cavity 12 through the driving spring 4, the ejector rod 3 penetrates through the through hole 11 and is connected with the centering mandrel 2, and the centering mandrel 2 is in sliding connection with the sliding cavity 13. In this embodiment, a threaded connection hole 21 is formed at the top end of the centering mandrel 2, and the ejector rod 3 is in threaded connection with the centering mandrel 2 through the threaded connection hole 21.
Specifically, the pushing inclined plane is a conical surface, and the driven inclined plane is an inclined plane or a partial conical surface matched with the conical surface, preferably a partial conical surface.
Specifically, a first cylinder 22, a first cone 23 connected with the first cylinder 22, a second cylinder 25 connected with the first cone 23, and a second cone 24 connected with the second cylinder 25 are sequentially arranged along the axial direction of the centering mandrel 2, the pushing inclined plane comprises a first conical surface arranged on the first cone 23 and a second conical surface arranged on the second cone 24, the respective inclination directions and inclination angles of the first conical surface and the second conical surface are the same, the respective diameters of the first cylinder 22 and the second cylinder 25 are equal, and the respective diameters of the first cone 23 and the second cone 24 gradually decrease along the direction away from the ejector rod 3.
Specifically, the driven inclined plane includes a first conical surface 63 and a second conical surface 64, the wedge 6 includes a block, and the first conical surface 63 and the second conical surface 64 are provided on the block, the respective inclination directions and inclination angles of the first conical surface 63 and the second conical surface 64 are the same, the first conical surface 63 and the first conical surface are abutted, and the second conical surface 64 and the second conical surface are abutted.
Specifically, the block body is a cambered surface on one side facing the through groove 15 and is embedded with the alloy layer 7, and can be in contact fit with the inner wall of the part 8, and the through grooves 15 are uniformly distributed in the circumferential direction of the body 1 and have even numbers, and ten through grooves (1.5.1-1.5.10 in fig. 5) are formed in the embodiment. Through the arrangement, the traditional wedge self-centering is generally three-point or two-point telescopic, and the traditional wedge self-centering is mainly used for positioning the part 8, so that the automatic clamping device has a positioning function and a good clamping function, so that the clamping force is uniformly applied to the inner wall of the sleeved part 8, the effective contact surface with the part 8 can be increased, the rigidity of the part 8 is enhanced, the part 8 cannot generate elastic deformation after processing, the processing precision of the part 8 is improved, different materials can be embedded into the wedge 6 to adapt to processing of the sleeve part 8 made of different materials, and the problems of scratching, crushing the part 8 and the like are avoided.
Specifically, a first circular arc groove 61 and a second circular arc groove 62 are arranged along the upper end and the lower end of the wedge block 6, a first annular groove 14 corresponding to the first circular arc groove 61 and a second annular groove 16 corresponding to the second circular arc groove 62 are arranged on the upper side wall and the lower side wall of the body 1, and the elastic piece comprises a first annular spring 52 arranged between the first annular groove 14 and the first circular arc groove 61 and a second annular spring 52 arranged between the second annular groove 16 and the second circular arc groove 62.
The principle of the invention is as follows:
referring to fig. 2, the sleeve part 8 is sleeved on the body 1, the ejector rod 3 is pressed down, the ejector rod 3 drives the centering mandrel 2 to move downwards in the cavity of the body 1, the contact diameter between the pushing inclined surface of the centering mandrel 2 and the driven inclined surface of the inclined wedge 6 is increased, the centering mandrel expands outwards in the groove of the body 1, the part 8 is tensioned, and at the moment, the first annular spring 52 and the second annular spring 52 on the body 1 are stretched; the ejector rod 3 is pushed down to cancel, the driving spring 4 in the driving cavity 12 resets and drives the centering mandrel 2 to move upwards along the driving cavity 12, the first annular spring 52 and the second annular spring 52 shrink and drive the inclined wedges 6 of the grooves around the body 1 to retract, the pushing inclined planes and the driven inclined planes are always kept in contact, the inner wall of the part 8 is tightly supported by the inclined wedges 6, and therefore the rigidity of the thin-wall sleeve part 8 can be effectively improved, and the machining deformation of the part 8 is avoided.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (10)
1. A self-centering tensioning mechanism, comprising:
the device comprises a body (1), wherein an installation cavity is formed in the axial direction of the body (1), and a plurality of through grooves (15) communicated with the installation cavity are formed in the circumferential direction of the body;
the centering mandrel (2) is axially and movably connected with the mounting cavity, and at least one pushing inclined plane is axially arranged along the centering mandrel (2);
the inclined wedge blocks (6) are arranged in the mounting cavity and are positioned beside each through groove (15), and the inclined wedge blocks (6) comprise driven inclined planes which are in sliding fit with the pushing inclined planes;
the ejector rod (3) is axially and movably connected with the mounting cavity and is used for driving the centering mandrel (2) to axially move along the mounting cavity;
the elastic piece is arranged between the body (1) and the inclined wedges (6) and is used for providing a force for the inclined wedges (6) to move along the radial direction in the through groove (15);
wherein, the axial movement of the centering mandrel (2) can be converted into radial movement of a plurality of wedge blocks (6) along the outside of the through groove (15).
2. The self-centering tensioning mechanism according to claim 1, wherein the mounting cavity comprises a through hole (11), a driving cavity (12) and a sliding cavity (13) which are respectively arranged on the upper side and the lower side of the through hole (11), a driving spring (4) is arranged in the driving cavity (12), the ejector rod (3) is movably arranged in the driving cavity (12) through the driving spring (4), and the ejector rod (3) penetrates through the through hole (11) and is connected with the centering mandrel (2), and the centering mandrel (2) is slidably connected with the sliding cavity (13).
3. The self-centering tensioning mechanism of claim 1, wherein the pushing ramp is a conical surface and the driven ramp is a ramp or partial conical surface that mates with the conical surface.
4. A self-centering tensioning mechanism according to claim 1, characterized in that a first cylinder (22), a first cone (23) connected with the first cylinder (22), a second cylinder (25) connected with the first cone (23) and a second cone (24) connected with the second cylinder (25) are sequentially arranged along the axial direction of the centering mandrel (2), the pushing inclined plane comprises a first conical surface arranged on the first cone (23) and a second conical surface arranged on the second cone (24), the respective inclination directions and inclination angles of the first conical surface and the second conical surface are the same, and the respective diameters of the first cylinder (22) and the second cylinder (25) are equal.
5. A self-centering tensioning mechanism as claimed in claim 4, wherein the respective diameters of said first (23) and second (24) vertebrae decrease progressively in a direction away from said carrier rod (3).
6. The self-centering tensioning mechanism according to claim 4, wherein the driven inclined surface comprises a first conical surface (63) and a second conical surface (64), the inclined wedge (6) comprises a block body, the first conical surface (63) and the second conical surface (64) are arranged on the block body, the inclination directions and the inclination angles of the first conical surface (63) and the second conical surface (64) are the same, the first conical surface (63) and the first conical surface are abutted, and the second conical surface (64) and the second conical surface are abutted.
7. A self-centering tensioning mechanism as claimed in claim 4, wherein the side of the block facing the through slot (15) is cambered and embedded with an alloy layer (7).
8. The self-centering tensioning mechanism according to claim 1, wherein a first circular arc groove (61) and a second circular arc groove (62) are formed along the upper end and the lower end of the inclined wedge block (6), a first annular groove (14) which is arranged corresponding to the first circular arc groove (61) and a second annular groove (16) which is arranged corresponding to the second circular arc groove (62) are formed on the upper side wall and the lower side wall of the body (1), and the elastic piece comprises a first annular spring (52) which is arranged between the first annular groove (14) and the first circular arc groove (61) and a second annular spring (52) which is arranged between the second annular groove (16) and the second circular arc groove (62).
9. A self-centering tensioning mechanism according to claim 1, characterized in that a plurality of said through slots (15) are uniformly distributed in the circumferential direction of said body (1) and are even in number.
10. Self-centering tensioning mechanism according to claim 1, characterized in that the top end of the centering mandrel (2) is provided with a threaded connection hole (21), and the ejector rod (3) is in threaded connection with the centering mandrel (2) through the threaded connection hole (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310492903.5A CN116441583A (en) | 2023-05-04 | 2023-05-04 | Self-centering tensioning mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310492903.5A CN116441583A (en) | 2023-05-04 | 2023-05-04 | Self-centering tensioning mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116441583A true CN116441583A (en) | 2023-07-18 |
Family
ID=87128578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310492903.5A Pending CN116441583A (en) | 2023-05-04 | 2023-05-04 | Self-centering tensioning mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116441583A (en) |
-
2023
- 2023-05-04 CN CN202310492903.5A patent/CN116441583A/en active Pending
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