CN214815454U - Self-centering clamping device - Google Patents
Self-centering clamping device Download PDFInfo
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- CN214815454U CN214815454U CN202120704470.1U CN202120704470U CN214815454U CN 214815454 U CN214815454 U CN 214815454U CN 202120704470 U CN202120704470 U CN 202120704470U CN 214815454 U CN214815454 U CN 214815454U
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Abstract
The utility model relates to a processing technology field of work piece discloses a from centering clamping device, including connecting seat, pull rod subassembly, radial positioning subassembly, hydraulic lifting unit, compress tightly subassembly and lathe lifting unit, during hydraulic lifting unit release, first elastic component can promote the pole cover and drive the up end butt that compresses tightly cover and cone and extrude the cone downwards so that the work piece radial positioning is on the connecting seat, lathe lifting unit can drive and compress tightly the work piece after the subassembly compresses tightly on the connecting seat with radial positioning. The utility model discloses a from radial positioning and the axial positioning that centering clamping device can realize the work piece, be applicable to the work piece of various models, carry out the clamping with the school table with the manual work and compare, it is long when having shortened the supplementary of processing work piece, improved the processing speed of work piece.
Description
Technical Field
The utility model relates to a processing technology field of work piece especially relates to a from centering clamping device.
Background
At present, for an external gear with a large modulus, hobbing, gear milling, gear shaping and gear grinding are mostly adopted to process the tooth part of a gear blank, the tooth part processing process of the gear blank comprises lifting, clamping, meter correcting, processing and measuring, the total time length of the lifting, the clamping and the meter correcting is called as auxiliary time length, and the proportion of the time length of the clamping and the meter correcting to the auxiliary time length is the largest.
Along with the continuous promotion of lathe and cutter performance, the tooth portion process time of tooth base shortens by a wide margin, and length accounts for the longer and more big proportion of the length of work piece tooth portion process when supplementary, to small-size large batch tooth base, can realize automatic clamping through the robot, nevertheless to large-scale tooth base, is subject to the robot and bears weight, and at present most still through artifical clamping and school table, the processing degree of difficulty of tooth base is great.
SUMMERY OF THE UTILITY MODEL
Based on it is above, an object of the utility model is to provide a from centering clamping device, reduced the processing degree of difficulty of large-scale work piece, shortened when processing work piece's supplementary length, improved the processing speed of work piece.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a self-centering clamping device, comprising: a connecting seat; the pull rod assembly comprises a rod body and a rod sleeve, wherein the rod sleeve comprises a threaded sleeve and a connecting sleeve, the threaded sleeve and the connecting sleeve are fixedly connected, and a convex ring is formed between the threaded sleeve and the connecting sleeve; the radial positioning assembly is sleeved on the rod sleeve and comprises a cone, a first elastic piece and a pressing sleeve; the hydraulic lifting assembly is connected with the connecting sleeve, and when the hydraulic lifting assembly is relieved of pressure, the first elastic piece can push the rod sleeve through the convex ring to drive the pressing sleeve to abut against the upper end face of the cone and downwards press the cone so as to enable a workpiece to be radially positioned on the connecting seat; a compression assembly disposed on the rod body; and the machine tool lifting assembly is connected with the rod body and can drive the pressing assembly to press the workpiece which is positioned in the radial direction onto the connecting seat.
As a preferred scheme of the self-centering clamping device, a tapered hole is formed in the connecting seat, the cone is arranged in the tapered hole, the workpiece can be sleeved on the connecting seat at the part where the tapered hole is arranged, and the lower end face of the workpiece can abut against the connecting seat.
As a preferred scheme of the self-centering clamping device, the self-centering clamping device further comprises a second elastic piece, the second elastic piece is sleeved on the threaded sleeve, one end of the second elastic piece is abutted to the connecting seat, the other end of the second elastic piece is abutted to the lower end face of the cone, and when the hydraulic lifting assembly is pressurized, the second elastic piece can push the cone to move upwards so that the part provided with the tapered hole is reduced in outer diameter of the connecting seat.
As a preferred aspect of a self-centering clamping device, the coupling socket includes: a base; the taper sleeve is fixedly arranged on the base, and the taper hole penetrates through the taper sleeve; at least two tight cover that expands, every the tight cover that expands all is fixed on the outer wall of taper sleeve, the tight cover that expands can with the protruding butt in order to follow of location of work piece the radial location of work piece the work piece.
As a preferred scheme of a self-centering clamping device, a step surface is arranged on the base, the connecting seat further comprises a supporting plate used for supporting the workpiece, the supporting plate is fixedly arranged on the step surface, and the upper end face of the supporting plate can be attached to the lower end face of the workpiece.
As a preferred scheme of the self-centering clamping device, the pressing sleeve is in threaded connection with the threaded sleeve, and the connecting sleeve is in threaded connection with the movable end of the hydraulic lifting assembly.
As a preferred aspect of a self-centering clamping device, the hydraulic lifting assembly comprises: a hydraulic pump; the jack is communicated with the hydraulic pump, and the hydraulic pump can drive the movable end of the jack to drive the rod sleeve to move along the length direction of the rod body.
As a preferred aspect of a self-centering clamping device, the compression assembly comprises: the pressing plate is sleeved on the pull rod assembly, and a spherical groove is formed in the pressing plate; the fixing piece is fixedly arranged on the pull rod assembly, a spherical protrusion corresponding to the spherical groove is arranged on the fixing piece, and the spherical protrusion can be abutted against the spherical groove to enable the pressing plate to axially position the workpiece along the axial direction of the workpiece.
As a preferred aspect of a self-centering clamping device, the platen includes: the spherical groove is formed in one side, close to the fixing piece, of the first pressing plate; and the second pressing plate is abutted against the upper end face of the workpiece and clamped between the workpiece and the first pressing plate.
As a preferred scheme of the self-centering clamping device, the self-centering clamping device further comprises a limiting piece, the limiting piece is connected with the connecting seat through a second fastening piece which penetrates through the cone and is fixed on the connecting seat, the limiting piece and the cone are arranged at an interval, and the limiting piece is used for limiting the cone along the radial direction.
The utility model has the advantages that: the utility model discloses a from centering clamping device compact structure, can realize the radial positioning and the axial positioning and the mutual noninterference of axial positioning of work piece, be applicable to the work piece of various models, wherein the pole body, first elastic component, compress tightly cover and hydraulic lifting unit and can realize the radial positioning to the work piece, the pole cover, compress tightly subassembly and lathe lifting unit and can realize the axial positioning to the work piece, carry out the clamping with the manual work and compare with the school table, it is long when having shortened the supplementary of processing work piece, the processing speed of work piece has been improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a cross-sectional view of a self-centering clamping device provided in accordance with an embodiment of the present invention;
fig. 2 is a cross-sectional view of a workpiece according to an embodiment of the present invention.
In the figure:
1. a connecting seat; 11. a base; 111. a base; 112. positioning seats; 110. a step surface; 12. a taper sleeve; 13. expanding and tightening the sleeve; 14. a support plate;
2. a cone;
31. a rod body; 321. a rod sleeve; 3211. a threaded sleeve; 3212. a connecting sleeve; 322. a convex ring; 3221. a first connecting projection; 3222. a second connecting projection;
4. a first elastic member;
5. a compression sleeve;
6. a second elastic member;
7. a hydraulic lifting assembly; 71. a hydraulic pump; 72. a jack;
8. a compression assembly; 81. pressing a plate; 811. a first platen; 812. a second platen; 82. a fixing member; 821. spherical surface is convex;
9. a machine tool lifting assembly;
10. a limiting member;
100. a workpiece; 1001. and a positioning projection.
Detailed Description
In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provides a self-centering clamping device, as shown in fig. 1, which includes a connecting seat 1, a pull rod assembly, a radial positioning assembly, a hydraulic lifting assembly 7, a pressing assembly 8 and a machine tool lifting assembly 9, wherein the pull rod assembly includes a rod body 31 and a rod sleeve 321 sleeved on the rod body 31, the rod sleeve 321 includes a threaded sleeve 3211 and a connecting sleeve 3212, the threaded sleeve 3211 and the connecting sleeve 3212 are fixedly connected and form a convex ring 322, the radial positioning assembly is sleeved on the rod sleeve 321 and includes a cone 2, a first elastic element 4 and a pressing sleeve 5, a movable end of the hydraulic lifting assembly 7 is connected with the connecting sleeve 3212, when the hydraulic lifting assembly 7 is released, the first elastic element 4 can push the rod sleeve 321 through the convex ring 322 to drive the pressing sleeve 5 to abut against an upper end face of the cone 2 and press the cone 2 downward to radially position the workpiece 100 on the connecting seat 1, the pressing assembly 8 is disposed on the rod body 31 and can abut against an upper end face of the workpiece 100, the movable end of the machine tool lifting component 9 is connected with the rod body 31, and the machine tool lifting component 9 can drive the pressing component 8 to press the workpiece 100 which is positioned in the radial direction on the connecting seat 1.
Specifically, the connecting seat 1 of the present embodiment is provided with a tapered hole, the workpiece 100 can be sleeved on a portion of the connecting seat 1 where the tapered hole is provided, the lower end surface of the workpiece 100 can abut against the connecting seat 1, and the cone 2 is provided in the tapered hole. The pressing sleeve 5 is in threaded connection with the threaded sleeve 3211, the position of the pressing sleeve 5 on the threaded sleeve 3211 is adjustable, and the movable end of the hydraulic lifting assembly 7 is in threaded connection with the connecting sleeve 3212.
Further, as shown in fig. 1, a first connecting protrusion 3221 is disposed at an end of the threaded sleeve 3211 of the present embodiment, one end of the connecting sleeve 3212 is threadedly connected to the movable end of the hydraulic lifting assembly 7, a second connecting protrusion 3222 is disposed at the other end of the connecting sleeve 3212, the first connecting protrusion 3221 and the second connecting protrusion 3222 form a convex ring 322, and the first connecting protrusion 3221 and the second connecting protrusion 3222 are fixedly connected by a first fastening member.
First elastic component 4 of this embodiment is the dish spring, and the dish spring is in compression state after 7 pressurizations of hydraulic pressure elevating assembly and before the pressure release, and cone 2 is in free stress state this moment, and when 7 pressure releases of hydraulic pressure elevating assembly, first elastic component 4 promotes rod cover 321 and drives and compress tightly 5 down and press cone 2, and the part connecting seat 1 that sets up the bell mouth expands and with work piece 100 butt, realizes the radial automatic positioning of work piece 100. After the radial positioning is completed, the pressing component 8 is installed on the rod body 31, and the rod body 31 is pulled down through the machine tool lifting component 9 so as to press the pressing component 8 on the workpiece 100, thereby ensuring that the workpiece 100 does not move axially in the machining process. By adjusting the number and the combination mode of the first elastic pieces 4, the axial movement stroke of the rod sleeve 321 and the pressure of the pressing sleeve 5 on the cone 2 can be flexibly adjusted, so that the self-centering clamping device can meet the radial positioning requirements of various workpieces 100. In other embodiments, the first elastic element 4 may also be a spring or other elastic structure, which is selected according to actual needs.
The first elastic component 4 of this embodiment is established on threaded sleeve 3211, and the one end of first elastic component 4 can with bulge loop 322 butt, the other end can with connecting seat 1 butt, the work piece 100 of this embodiment is the tooth base, the dotted line in fig. 1 represents work piece 100, from centering clamping device be used for along the axial of tooth base and radial positioning tooth base to the realization is to the processing of the tooth portion of tooth base. The sleeve and the rod body 31 of the present embodiment are not in contact with each other, so as to prevent the sleeve and the rod body 31 from being worn by each other due to friction force generated when the sleeve and the rod body are opposite to each other, and increase the smoothness of movement of the sleeve and the rod body 31.
The self-centering clamping device provided by the embodiment is compact in structure, can realize radial positioning and axial positioning of the workpiece 100, and the radial positioning and the axial positioning are not interfered with each other, and is suitable for workpieces 100 of various models, wherein the rod body 31, the first elastic piece 4, the pressing sleeve 5 and the hydraulic lifting assembly 7 can realize the radial positioning of the workpiece 100, the rod sleeve 321, the pressing assembly 8 and the machine tool lifting assembly 9 can realize the axial positioning of the workpiece 100, and compared with manual clamping and meter calibration, the auxiliary time length for processing the workpiece 100 is shortened, and the processing speed of the workpiece 100 is improved.
As shown in fig. 1, the self-centering clamping device further includes a second elastic member 6, the second elastic member 6 is a disc spring, the second elastic member 6 is sleeved on the threaded sleeve 3211, one end of the second elastic member 6 abuts against the connecting seat 1, and the other end abuts against the lower end surface of the cone 2, when the hydraulic lifting assembly 7 is pressurized, the second elastic member 6 can push the cone 2 to move upward so as to reduce the outer diameter of the portion of the connecting seat 1 where the tapered hole is formed. In other embodiments, the second elastic element 6 may also be a spring or other elastic structure, which is selected according to actual needs.
Specifically, before pressurizing hydraulic lifting unit 7, when compressing sleeve 5 is screwed into rod sleeve 321, compressing sleeve 5 moves downward to act on cone 2, part of connecting seat 1 provided with the tapered hole expands outward after being stressed, second elastic element 6 is compressed, the expanded outer diameter of part of connecting seat 1 provided with the tapered hole is larger than the diameter of the inner hole of workpiece 100, and the screwing depth of compressing sleeve 5 is within the effective stroke range of hydraulic lifting unit 7. When the hydraulic lifting assembly 7 is pressurized, the second elastic piece 6 can push the cone 2 to move upwards, the taper sleeve 12 and the part of the connecting seat 1 provided with the taper hole are contracted and reset, and the cone 2 is in a free stress state.
As shown in fig. 1, the connecting seat 1 of this embodiment includes the base 11, the taper sleeve 12 and four expansion sleeves 13, the base 11 includes base 111 and positioning seat 112, base 111 and positioning seat 112 pass through bolt fixed connection, taper sleeve 12 is fixed to be set up on base 11, the bell mouth runs through taper sleeve 12 and sets up, four expansion sleeves 13 are along fixing on the outer wall of taper sleeve 12 in the circumference of taper sleeve 12 is fixed to be set up, as shown in fig. 2, expansion sleeve 13 can with the protruding butt of location 1001 butt of work piece 100 with radial location work piece 100 along work piece 100, prevent that work piece 100 from moving along self radial direction. When workpieces 100 with different inner diameters are processed, the expansion sleeve 13 with different outer diameters can be replaced, so that the expansion sleeve 13 can be suitable for the workpieces 100, and the applicability of the self-centering clamping device is improved. In other embodiments, the expansion sleeve 13 may abut against the inner wall surface of the workpiece 100 to achieve radial positioning of the workpiece 100, specifically, the radial positioning may be selected according to the machining accuracy of the inner wall surface of the workpiece 100.
Specifically, the cone 2 and the taper sleeve 12 interact through a conical surface, the taper sleeve 12 has an expansion and contraction amount of 2mm at the maximum diameter under the acting force of the cone 2, and the up-and-down movement amount of the cone 2, the expansion and contraction amount of the taper sleeve 12 and the elastic deformation amount of the second elastic element 6 can be adjusted by adjusting different positions of the pressing sleeve 5 on the rod sleeve 321.
As shown in fig. 1, the base 11 of the present embodiment is provided with a step surface 110, the connecting base 1 further includes a supporting plate 14 for supporting the workpiece 100, the supporting plate 14 is fixedly disposed on the step surface 110, and an upper end surface of the supporting plate 14 can be attached to a lower end surface of the workpiece 100. The number of the support plates 14 in the embodiment is six, each support plate 14 is positioned on the base 11 through a positioning pin and is fixed on the base 11 through a bolt, and a gap exists between two adjacent support plates 14, so that the arrangement can ensure that a mechanical claw can extend into the gap between the two support plates 14, and the arrangement is favorable for placing an unprocessed workpiece 100 on the support plates 14 and removing a processed workpiece 100 from a support. Further, the size and thickness of the support plate 14 may be determined according to the diameter and height of the workpiece 100 to be machined, so as to ensure that the self-centering clamping device is suitable for workpieces 100 with different diameters and different thicknesses, and improve the applicability of the self-centering clamping device to the workpiece 100.
As shown in fig. 1, the hydraulic lifting assembly 7 of this embodiment includes a hydraulic pump 71 and a jack 72, the jack 72 communicates with the hydraulic pump 71 through an oil pipe, interfaces of the jack 72 and the hydraulic pump 71 with the oil pipe are quick-change interfaces, which are convenient to install and remove, the movable end of the jack 72 is provided with an internal threaded hole, the outer wall of the connecting sleeve 3212 is provided with an external thread matching with the internal threaded hole of the movable end of the jack 72, the connecting sleeve 3212 is in threaded connection with the jack 72, and the connecting hydraulic pump 71 can drive the movable end of the jack 72 to drive the rod sleeve 321 to move along the length direction of the rod body 31. The jack 72 is hollow and has a pressure maintaining function, the hydraulic pump 71 can be either manual or electric, and the hydraulic pump 71 and the jack 72 belong to the prior art and can be obtained by outsourcing.
As shown in fig. 1, the self-centering clamping device of the present embodiment further includes a limiting member 10, the limiting member 10 is connected by a second fastening member (not shown in the drawings) penetrating through the cone 2 and fixed on the connecting base 1, the limiting member 10 is disposed at a distance from the cone 2, and the limiting member 10 is used for radially limiting the cone 2, that is, the limiting member 10 is fixed on the connecting base 1 and is used for radially limiting the cone 2. Before a hydraulic pump 71 is used for pressurizing a jack 72, a pressing sleeve 5 is screwed on a threaded sleeve 3211, the pressing sleeve 5 is abutted against a cone 2, a cone sleeve 12 is in an expanded state, a second elastic piece 6 is in a compressed state, then the hydraulic pump 71 continuously pressurizes the jack 72, a movable end of the jack 72 drives a rod sleeve 321 to move upwards along the length direction of a rod body 31, the pressing sleeve 5 moves upwards along with the rod sleeve 321 until the pressing sleeve 5 is separated from the cone 2, at the moment, the cone 2 is in a free stress state, the second elastic piece 6 pushes the cone 2 to move upwards, the second elastic piece 6 only bears the pressure same as the gravity of the cone 2, the cone sleeve 12 contracts and resets, after a workpiece 100 is placed on a supporting plate 14, the hydraulic pump 71 releases pressure, the jack 72 retracts, the threaded sleeve 3211 moves downwards under the elastic action of a first elastic piece 4 to drive the upper pressing sleeve 5 to press the cone 2 downwards, the taper sleeve 12 expands, and the expansion sleeve 13 abuts against the positioning protrusion 1001 of the workpiece 100, so that the workpiece 100 is automatically positioned in the radial direction.
As shown in fig. 1, the pressing assembly 8 of the present embodiment includes a pressing plate 81 and a fixing member 82, the pressing plate 81 is sleeved on the pull rod assembly, a spherical groove is disposed on the pressing plate 81, the fixing member 82 is fixedly disposed on the pull rod assembly, a spherical protrusion 821 corresponding to the spherical groove is disposed on the fixing member 82, and the spherical protrusion 821 can abut against the spherical groove to enable the pressing plate 81 to position the workpiece 100 along the axial direction of the workpiece 100. The spherical protrusion 821 is abutted to the spherical groove to ensure that the pressing plate 81 is in surface-to-surface contact with the upper end surface of the workpiece 100, so that the pressing plate 81 and the workpiece 100 are uniformly stressed. The machine tool lifting assembly 9 in the embodiment is a hydraulic stretching structure of a machine tool, the machine tool lifting assembly 9 can drive the rod body 31 and the fixing piece 82 to move along the length direction of the rod body 31, the rod body 31 can be pulled to move downwards when the machine tool lifting assembly 9 is pressurized, and the rod body 31 can be driven to reset when the pressure is released.
As shown in fig. 1, the pressing plate 81 of the present embodiment includes a first pressing plate 811 and a second pressing plate 812, a spherical groove is provided on a side of the first pressing plate 811 close to the fixing member 82, the second pressing plate 812 abuts against an upper end surface of the workpiece 100, and the second pressing plate 812 is interposed between the workpiece 100 and the first pressing plate 811. The first pressing plate 811 is an open C-shaped plate, the second pressing plate 812 is a circular plate with an avoidance hole in the middle, and the diameter of the second pressing plate 812 is selected according to the outer diameter of the workpiece 100 to be processed, so as to ensure that the second pressing plate 812 can press the workpiece 100 against the supporting plate 14, and thus, the axial positioning of the workpiece 100 is realized.
When the workpiece 100 is positioned along the radial direction and the axial direction, the self-centering clamping device is pre-positioned firstly, then the workpiece 100 is processed, and the specific operation steps of pre-positioning the self-centering clamping device are as follows:
s1, mounting the self-centering clamping device except the second pressure plate 812, the first pressure plate 811, the fixing piece 82, the hydraulic pump 71, the expansion sleeve 13 and the support plate 14 on a machine tool;
s2, selecting and installing a supporting plate 14 matched with the height of the workpiece 100, and requiring that a positioning bulge 1001 of an inner hole of the workpiece 100 is in full contact with the inner wall surface of the expansion sleeve 13;
s3, selecting and installing an expansion sleeve 13 matched with the workpiece 100, wherein the expansion sleeve 13 is required to be in full contact with the positioning protrusion 1001 of the workpiece 100 when the taper sleeve 12 expands;
s4, the jack 72 is in a pressure relief state, and the extending distance of the movable end of the jack 72 is 0 mm;
s5, adjusting the screwing depth of the connecting sleeve 3212 into the jack 72 to ensure that the distance between the upper end face of the first elastic element 4 and the lower end face of the positioning seat 112 is 1mm-2 mm;
s6, after the pressing sleeve 5 is installed on the threaded sleeve 3211, the pressing sleeve 5 is guaranteed not to contact with the cone 2, the distance is 1mm-2mm, and the cone 2 is in a free stress state;
s7, using a dial indicator to correct and adjust the excircle of the expansion sleeve 13, and ensuring the total jump to be within 0.01 mm;
s8, screwing the pressing sleeve 5 downwards by using a wrench, wherein the pressing sleeve 5 can push the cone 2 to move downwards in the downward movement process, the cone 2 extrudes the taper sleeve 12, the taper sleeve 12 expands outwards after being stressed, and the downward screwing depth of the pressing sleeve 5 meets the following conditions: the expanded outer diameter of the expansion sleeve 13 is larger than the diameter of the inner hole of the workpiece 100, and the screwing depth of the compression sleeve 5 is within the effective stroke range of the jack 72.
In S7, the full jump of the dial indicator is within 0.01mm, so that the expansion sleeve 13 is ensured to be circular when expanded after expansion, and the contact area between the expansion sleeve 13 and the positioning protrusion 1001 of the workpiece 100 is ensured to be large, thereby radially positioning the workpiece 100 on the expansion sleeve 13.
After the self-centering clamping device finishes the pre-positioning, the steps of processing the tooth part of the workpiece 100 are as follows:
s9, communicating the quick connector of the jack 72 with the hydraulic pump 71 through an oil pipe;
s10, continuously pressurizing by the hydraulic pump 71, increasing the screwing-out length of the jack 72 until the pressing sleeve 5 is separated from the cone 2, maintaining the pressure, wherein the cone 2 moves upwards under the resilience action of the second elastic piece 6, the cone sleeve 12 and the expansion sleeve 13 contract and reset, and the elastic deformation amount of the second elastic piece 6 is reduced;
s11, the workpiece 100 is placed on the supporting plate 14, the hydraulic pump 71 releases pressure, the movable end of the jack 72 retracts, the threaded sleeve 3211 moves downwards under the action of the elastic force of the first elastic piece 4, the threaded sleeve 3211 drives the pressing sleeve 5 to extrude the cone 2 downwards, the cone 2 extrudes the cone sleeve 12, the cone sleeve 12 expands, and the expansion sleeve 13 abuts against the positioning protrusion 1001 of the workpiece 100, so that the workpiece 100 is automatically positioned in the radial direction;
s12, disassembling the oil pipe and the hydraulic pump 71, sequentially sleeving the second pressing plate 812 and the first pressing plate 811 on the rod body 31, installing the fixing piece 82 on the rod body 31, and pressing the second pressing plate 812 on the workpiece 100 by the machine tool lifting assembly 9 through the lower rod body 31 so as to enable the spherical protrusion 821 of the fixing piece 82 to be abutted to the spherical groove on the first pressing plate 811, wherein the machine tool lifting assembly 9 continues to press the lower rod body 31, and the workpiece 100 does not move axially in the machining process.
After one workpiece 100 is machined, another workpiece 100 of the same type is mounted and machined, and the steps S9-S12 are repeated.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A self-centering clamping device, comprising:
a connecting seat (1);
the pull rod assembly comprises a rod body (31) and a rod sleeve (321), wherein the rod sleeve (321) comprises a threaded sleeve (3211) and a connecting sleeve (3212), the threaded sleeve (3211) and the connecting sleeve (3212) are fixedly connected, and both form a convex ring (322);
the radial positioning assembly is sleeved on the rod sleeve (321) and comprises a cone (2), a first elastic piece (4) and a pressing sleeve (5);
the hydraulic lifting assembly (7) is connected with the connecting sleeve (3212), and when the hydraulic lifting assembly (7) releases pressure, the first elastic piece (4) can push the rod sleeve (321) through the convex ring (322) to drive the pressing sleeve (5) to abut against the upper end face of the cone (2) and downwards press the cone (2) so as to radially position the workpiece (100) on the connecting base (1);
a compression assembly (8) disposed on the rod body (31);
the machine tool lifting component (9) is connected with the rod body (31), and the machine tool lifting component (9) can drive the pressing component (8) to press the workpiece (100) which is positioned in the radial direction onto the connecting seat (1).
2. The self-centering clamping device as claimed in claim 1, wherein a tapered hole is provided on the connecting base (1), the cone (2) is disposed in the tapered hole, the workpiece (100) can be sleeved on the portion of the connecting base (1) where the tapered hole is provided, and the lower end surface of the workpiece (100) can abut against the connecting base (1).
3. The self-centering clamping device as claimed in claim 2, further comprising a second elastic member (6), wherein the second elastic member (6) is sleeved on the threaded sleeve (3211), one end of the second elastic member (6) abuts against the connecting seat (1), the other end of the second elastic member abuts against the lower end face of the cone (2), and when the hydraulic lifting assembly (7) is pressurized, the second elastic member (6) can push the cone (2) to move upwards so as to reduce the outer diameter of the connecting seat (1) at the portion where the tapered hole is arranged.
4. The self-centering clamping device according to claim 2, wherein the connection seat (1) comprises:
a base (11);
the taper sleeve (12) is fixedly arranged on the base (11), and the taper hole penetrates through the taper sleeve (12);
at least two tight cover (13) expand, every tight cover (13) expand all fix on the outer wall of taper sleeve (12), the tight cover (13) that expands can with the location arch (1001) butt of work piece (100) is in order to follow the radial location of work piece (100).
5. The self-centering clamping device according to claim 4, wherein a step surface (110) is arranged on the base (11), the connecting base (1) further comprises a supporting plate (14) for supporting the workpiece (100), the supporting plate (14) is fixedly arranged on the step surface (110), and the upper end surface of the supporting plate (14) can be fitted with the lower end surface of the workpiece (100).
6. The self-centering clamping device according to claim 1, wherein the compression sleeve (5) is threadedly connected to the threaded sleeve (3211), and the connecting sleeve (3212) is threadedly connected to the free end of the hydraulic lifting assembly (7).
7. The self-centering clamping device according to any one of claims 1 to 6, wherein the hydraulic lifting assembly (7) comprises:
a hydraulic pump (71);
the jack (72) is communicated with the hydraulic pump (71), and the hydraulic pump (71) can drive the movable end of the jack (72) to drive the rod sleeve (321) to move along the length direction of the rod body (31).
8. The self-centering clamping device according to any one of claims 1 to 6, wherein the pressing assembly (8) comprises:
the pressing plate (81) is sleeved on the pull rod assembly, and a spherical groove is formed in the pressing plate (81);
the fixing piece (82) is fixedly arranged on the pull rod assembly, a spherical protrusion (821) corresponding to the spherical groove is arranged on the fixing piece (82), and the spherical protrusion (821) can be abutted to the spherical groove to enable the pressing plate (81) to position the workpiece (100) along the axial direction of the workpiece (100).
9. The self-centering clamping device according to claim 8, wherein the pressure plate (81) comprises:
the spherical groove is formed in one side, close to the fixing piece (82), of the first pressing plate (811);
and a second pressing plate (812) which abuts against the upper end surface of the workpiece (100) and is interposed between the workpiece (100) and the first pressing plate (811).
10. The self-centering clamping device according to any one of claims 1 to 6, further comprising a retaining member (10), wherein the retaining member (10) is connected to the cone (2) by a second fastening member extending through the cone (2) and fixed to the connecting base (1), the retaining member (10) is spaced apart from the cone (2), and the retaining member (10) is used for radially retaining the cone (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120704470.1U CN214815454U (en) | 2021-04-07 | 2021-04-07 | Self-centering clamping device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114393430A (en) * | 2022-02-23 | 2022-04-26 | 重庆渝江压铸有限公司 | Self-centering fixing device |
| CN114799948A (en) * | 2022-05-18 | 2022-07-29 | 威海职业学院(威海市技术学院) | Multi-shaft machine tool clamp with correction structure |
| CN115338661A (en) * | 2022-08-31 | 2022-11-15 | 湖北三江航天险峰电子信息有限公司 | Multi-station pressing device |
-
2021
- 2021-04-07 CN CN202120704470.1U patent/CN214815454U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114393430A (en) * | 2022-02-23 | 2022-04-26 | 重庆渝江压铸有限公司 | Self-centering fixing device |
| CN114393430B (en) * | 2022-02-23 | 2023-11-07 | 重庆渝江压铸有限公司 | Self-centering fixing device |
| CN114799948A (en) * | 2022-05-18 | 2022-07-29 | 威海职业学院(威海市技术学院) | Multi-shaft machine tool clamp with correction structure |
| CN115338661A (en) * | 2022-08-31 | 2022-11-15 | 湖北三江航天险峰电子信息有限公司 | Multi-station pressing device |
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