CN221047858U - Friction locking type clamp - Google Patents
Friction locking type clamp Download PDFInfo
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- CN221047858U CN221047858U CN202322623439.7U CN202322623439U CN221047858U CN 221047858 U CN221047858 U CN 221047858U CN 202322623439 U CN202322623439 U CN 202322623439U CN 221047858 U CN221047858 U CN 221047858U
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- 230000006378 damage Effects 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 238000003754 machining Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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Abstract
The utility model relates to the technical field of workpiece fixtures, and discloses a friction locking type fixture, which is used for locking a stator, wherein the inner side surface of the stator is provided with a plurality of arc-shaped surfaces along the circumferential direction, the arc-shaped surfaces gradually approach to a rotation center from one end to the other end, and the two ends of the locking stator are in sliding fit with arc-shaped grooves on a rotating end plate through limiting blocks; the two rotating end plates are connected near the edges through connecting rods, reset springs are arranged between the connecting rods and the locking stators, a plurality of limit springs are arranged on the rotating end plates along the radial direction, the end parts of the limit springs of the two rotating end plates are connected through locking rollers, the locking rollers are matched with the arc-shaped surfaces, and one end of each locking stator is connected with the connecting disc; the clamping state of the workpiece is friction locking; no matter how large the cutting resistance is, the clamp will not slip relative to the workpiece. The clamp is simple to use, and can reduce the clamping labor intensity of operators; the surface of the finished workpiece is free from clamping injury; the thin-wall part is clamped and does not deform.
Description
Technical Field
The utility model relates to the technical field of workpiece clamps, in particular to a friction locking type clamp.
Background
The chuck commonly used in the machining industry clamps and positions a revolving body workpiece, and the transmission of the chuck is divided into a three-jaw (two-jaw or multi-jaw) linkage self-centering type and a four-jaw (two-jaw or multi-jaw) single-action centering type. The clamping jaws are moved along radial grooves of the chuck by power to press the workpiece, and when the chuck rotates, the clamping jaws drag the workpiece to rotate by friction. This clamping method has the following problems:
1. The friction coefficient between the claw and the workpiece is approximately a fixed value, and the friction drag force is proportional to the positive pressure. So that during the work piece turning process, the work piece is at risk of moving or flying once the pressure is lost (electric, pneumatic and hydraulic chucks) or the clamping force is too low (manual chucks).
2. Because of the friction force generated by positive pressure, the clamping precision and the working safety are affected by the abrasion of the clamping jaws; and the risk of clamping deformation is increased for thin-wall parts.
Disclosure of utility model
Aiming at the defects existing in the prior art, the utility model aims to provide a friction locking type clamp, wherein the clamping state of a part is friction locking; no matter how large the cutting resistance is, the clamp will not slip relative to the workpiece. The clamp is simple to use, and can reduce the clamping labor intensity of operators; the surface of the finished workpiece is free from clamping injury; the thin-wall part is clamped and does not deform.
In order to achieve the above object, the present utility model is realized by the following technical scheme:
a friction locking type clamp comprises a locking stator, wherein the inner side surface of the locking stator is provided with a plurality of sections of arc surfaces along the circumferential direction, the arc surfaces are gradually close to a rotation center from one end to the other end, and two ends of the locking stator are in sliding fit with arc grooves on a rotating end plate through limiting blocks; the two rotating end plates are connected near the edges through connecting rods, reset springs are arranged between the connecting rods and locking stators, a plurality of limit springs are arranged on the rotating end plates along the radial direction, the end parts of the limit springs of the two rotating end plates are connected through locking rollers, the locking rollers are matched with the arc-shaped surfaces, and one end of each locking stator is connected with the connecting disc.
As a further implementation mode, a plurality of limiting blocks are arranged at two ends of the locking stator along the circumferential direction, the cross sections of the limiting blocks are arc-shaped, the arc-shaped grooves are arranged along the circumferential direction of the rotating end plate, the limiting blocks at one end of the locking stator penetrate through the arc-shaped grooves and are fixedly connected with the connecting disc, the size of the arc-shaped grooves is larger than that of the limiting blocks, and the rotating end plate and the locking stator can rotate relatively.
As a further implementation mode, the rotating end plate between the locking stator and the connecting disc is a first rotating end plate, the rotating end plate of the locking stator far away from one end of the connecting disc is a second rotating end plate, and the connecting rod is located outside the locking stator.
As a further implementation mode, the first rotating end plate is provided with a plurality of threaded holes, the second rotating end plate is provided with a plurality of through holes, one end of the connecting rod is in threaded connection with the threaded holes, and the other end of the connecting rod penetrates through the through holes and then is connected with the fixing piece.
As a further implementation mode, a plurality of through grooves are formed in the rotating end plate in the radial direction, the limiting springs are arranged in the through grooves, one ends of the limiting springs are connected with the tail ends of the through grooves, the other ends of the limiting springs are connected with the moving blocks, and the corresponding moving blocks on the first rotating end plate and the second rotating end plate are connected through locking rollers.
As a further implementation mode, a cover plate is arranged on one side, far away from the locking stator, of the second rotating end plate, a hole is formed in the center of the cover plate, and the edge of the cover plate is fixedly connected with the connecting rod.
As a further implementation manner, the through grooves and the arc-shaped grooves are staggered.
As a further implementation mode, the reset spring extends annularly along the outer side face of the locking stator, one end of the reset spring is connected with the outer side face of the locking stator, and the other end of the reset spring is connected with the middle position of the connecting rod.
As a further implementation mode, a round hole is formed in the middle of the rotating end plate, and the through groove is communicated with the round hole.
As a further implementation, the return spring acts on the rotating end plate so that the locking roller is always located at one end of the arc-shaped surface close to the rotation center in a natural state.
The beneficial effects of the utility model are as follows:
According to the utility model, through the arrangement of the structures such as the circular arc surface on the inner side of the locking stator, the rotating end plate, the connecting rod, the locking roller and the like, and the circular arc surface gradually approaches the rotation center from one end to the other end, the clamp becomes a rotation clamp, and the clamping state of a workpiece is friction locking; no matter how large the cutting resistance is, the clamp does not slip relative to the workpiece; the clamp is simple to use, and the surface of the finished workpiece is free from clamping injury; the thin-wall part is clamped and does not deform.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
Fig. 1 is a schematic view of the overall structure of a friction locking type clamp according to an embodiment of the present utility model.
FIG. 2 is a schematic top view of a friction locking clamp according to an embodiment of the present utility model;
FIG. 3 is an isometric view of a friction locking clamp in accordance with an embodiment of the utility model;
FIG. 4 is an exploded view of a friction locking clamp in accordance with an embodiment of the present utility model;
FIG. 5 is a schematic view of a rotating end plate according to an embodiment of the present utility model;
FIG. 6 is a schematic structural view of a land in an embodiment of the utility model;
fig. 7 is a schematic diagram of the locking of a friction locking clamp in an embodiment of the utility model.
In the figure: the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustration is only schematic.
Wherein: 1. the locking stator, 2, the rotating end plate, 3, the connecting disc, 4, the cover plate, 5, the connecting rod, 6, the return spring, 7, the fixing piece and 8, the workpiece; 11. the device comprises a limiting block, a limiting spring, a moving block, a locking roller, an arc-shaped groove, a through groove and a threaded hole.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
Example 1
In an exemplary embodiment of the present utility model, referring to fig. 1, a friction locking type clamp includes a locking stator 1, a connection disc 3, and a rotating end plate 2. The locking stator 1 is arranged in a hollow way, the center is a rotation center, three arc-shaped surfaces are arranged on the inner side surface of the locking stator 1 along the circumferential direction, and the three arc-shaped surfaces are gradually close to the rotation center from one end to the other end.
Three limiting blocks 11 are uniformly arranged at two ends of the locking stator 1 along the circumferential direction, the sections of the limiting blocks 11 are arc-shaped, the limiting blocks 11 have set heights, and gaps are reserved between adjacent limiting blocks 11.
The two ends of the locking stator 1 are in sliding fit with the arc-shaped grooves 24 on the rotating end plate 2 through limiting blocks 11, as shown in fig. 5, the arc-shaped grooves 24 are arranged along the circumferential direction of the rotating end plate, and three arc-shaped grooves 24 are correspondingly arranged, and the number of the arc-shaped grooves is the same as the number of the three limiting blocks at one end of the locking stator 1. As shown in fig. 7, three arc-shaped grooves are correspondingly arranged on the end face of the first end of the connecting disc 3, and the second end is used for being connected with a main shaft of a machine tool.
The two ends of the locking stator 1 are respectively matched with the rotating end plate 2, namely a first rotating end plate and a second rotating end plate, wherein the first rotating end plate is arranged between the locking stator 1 and the connecting disc 3, and the second rotating end plate is arranged at the other end of the locking stator 1 and is matched with the limiting block through an arc-shaped groove. The outer diameter of the two rotating end plates 2 is larger than the outer diameter of the locking stator 1, and the two rotating end plates 2 are connected near the edges by a connecting rod 5. The connecting rod 5 is located on the outer side of the locking stator 1.
The size of the arc-shaped groove 24 in this embodiment is larger than the size of the limiting block 11, so that the two rotating end plates 2 and the locking stator 1 can rotate relatively, and the two rotating end plates 2 are connected through the connecting rod 5, so that synchronous rotation is realized.
As shown in fig. 5, a schematic structural diagram of the rotating end plate 2 is shown, three through grooves 25 are radially arranged on the first rotating end plate, a round hole is formed in the middle of the rotating end plate 2, the through grooves 25 are communicated with the round hole, and the through grooves and the arc-shaped grooves 24 are staggered.
The first rotating end plate is provided with three threaded holes 26, and the second rotating end plate is correspondingly provided with three through holes, wherein the threaded holes 26 and the corresponding through holes are arranged between the arc-shaped grooves 24 and the edges of the rotating end plates. As shown in fig. 1, one end of the connecting rod 5 is in threaded connection with the threaded hole, and the other end of the connecting rod passes through the through hole and then is connected with the fixing piece 7.
One side of the second rotating end plate far away from the locking stator 1 is provided with a cover plate 4, the center of the cover plate 4 is provided with a hole, a workpiece is convenient to enter the locking stator 1 to be clamped, the edge of the cover plate 4 is fixedly connected with a connecting rod, namely, the connecting rod 5 penetrates through a through hole of the second rotating end plate and the cover plate 4 and is fixed through a nut and a gasket.
The limiting block of the locking stator 1, which is close to the first rotating end plate, passes through the arc-shaped groove 24 to be matched with and fixedly connected with the arc-shaped groove on the connecting disc, and the sum of the depth of the arc-shaped groove and the depth of the arc-shaped groove 24 on the first rotating end plate is matched with the height of the limiting groove.
As shown in fig. 2, 3 and 5, three limit springs 21 are radially arranged on the rotary end plate 2, the limit springs 21 are arranged in the through grooves 25, one ends of the limit springs 21 are connected with the tail ends of the through grooves 25, the other ends of the limit springs are connected with the movable blocks 22, the corresponding movable blocks 22 on the first rotary end plate and the second rotary end plate are connected through locking rollers 23, and the cover plate 4 is used for preventing the movable blocks from being axially separated from hurting people.
Wherein the locking rollers 23 are engaged with the arcuate surfaces of the inner sides of the locking stators 1, each locking roller 23 is engaged with the arcuate surface of one locking stator, and the locking rollers 23 are movable along the arcuate surfaces of the inner sides of the locking stators 1 when the two rotating end plates 2 are rotated.
As shown in fig. 1, a return spring 6 is arranged between the connecting rod 5 and the locking stator 1, the return spring 6 extends annularly along the outer side surface of the locking stator 1, one end of the return spring 6 is connected with the outer side surface of the locking stator, the other end of the return spring is connected with the middle position of the connecting rod, and the return spring 6 acts on the rotating end plate to enable the locking roller to be always located at one end of the arc-shaped surface close to the rotation center in a natural state.
The moving block 22 of the present embodiment can slide along the through groove 25 on the rotating end plate 2 and be reset by the limiting spring 21, and the limiting spring 21 can also ensure that the locking roller always contacts the locking arc surface of the locking stator no matter in any state.
The return spring 6 is used for applying a force to the rotating end plate through the connecting rod so that the locking roller is always kept at one end of the arc surface of the locking stator close to the rotation center, and also is used for resetting the locking roller and the rotating end plate.
As shown in fig. 7, the section of the arc surface of the inner cavity of the locking stator is formed by connecting a plurality of arcs, each arc surface is formed by arcs at two ends, the first section is a basic arc, the center is O, and the center is the rotation center after the workpiece is clamped; the centers of the second long circular arcs (locking circular arcs) are respectively O 1、O3、O4 clamps (O 3、O4 is not drawn, and is obtained by O 1 by using O as a center and 3 parts of circular arrays) and the radius of the second long circular arcs is R; the eccentric amount is H.
The center of the clamped workpiece 8 is O, which is also the rotation center of the clamp; the radius of which is R 1. The turning radius of the locking roller is r, and the turning center is O 2; the initial phase angle is B (the other two are not shown, which are derived from an array of 3 circles centered on O by O 2).
The included angle between the locking roller 23 and the common tangent of the workpiece 8 and the locking stator 1 is A, and if A is smaller than 2 times of equivalent friction angle, no sliding is indicated among the locking stator 1, the locking roller 23 and the workpiece 8; the workpiece can be effectively locked.
And (3) calculating locking conditions:
it is easy to push out from the figure:
H＝(R1+r)X{cosAtg(A+B)-sinA}
R＝{(R1+r)XcosA/cos(A+B)}+r
equivalent friction angle formula ψ= arctgf;
Wherein f-the coefficient of sliding friction of the material, steel-to-steel f=0.15, ψ is approximately equal to 8.5 DEG
B=16° is taken by b.ltoreq.2ψ.about.17°
Therefore: h= (R 1 +r) X { cosAtg (a+16°) -sinA }
R＝{(R1+r)XcosA/cos(A+16°)}+r
Calculating the maximum locking amount:
By the principle of three-point rounding, the workpiece is locked by three rollers more safely. When r=0.35R 1, the ratio of the maximum to minimum locking diameter is 1.602; the standard number sequence R5 (r5= 5 =v10=1.60) is satisfied, and a series of products can be produced.
Working principle:
The left hand rotates the rotating end plate (locking roller retainer assembly) clockwise, and the roller moving block 22 moves to the large diameter direction under the action of the locking roller limit spring; the diameter of the inscribed circle of the locking roller is increased, and the workpiece is put into the right hand. The left hand releases the locking roller retainer component to rotate anticlockwise under the action of the reset spring; the diameter of the inscribed circle of the locking roller is reduced; locking the workpiece 8. After the processing is stopped, the locking roller retainer component is rotated clockwise; and removing the workpiece. A clamping cycle is completed.
The clamp is suitable for clamping a turning and grinding rotary body workpiece in machining, and is used for clamping the outer diameter part of the workpiece; partially replacing the function of a mechanical clamping chuck. The method is applied to mass production of shaft, sleeve and thin-wall sleeve parts in the machining industry, and can effectively reduce auxiliary time and clamping deformation (thin-wall sleeve parts); but is not applicable to workpieces with shorter clamping parts and larger weight.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The friction locking type clamp is characterized by comprising a locking stator, wherein the inner side surface of the locking stator is provided with a plurality of sections of arc surfaces along the circumferential direction, the arc surfaces gradually approach the rotation center from one end to the other end, and the two ends of the locking stator are in sliding fit with arc grooves on a rotating end plate through limiting blocks; the two rotating end plates are connected near the edges through connecting rods, reset springs are arranged between the connecting rods and locking stators, a plurality of limit springs are arranged on the rotating end plates along the radial direction, the end parts of the limit springs of the two rotating end plates are connected through locking rollers, the locking rollers are matched with the arc-shaped surfaces, and one end of each locking stator is connected with the connecting disc.
2. The friction locking type clamp according to claim 1, wherein a plurality of limiting blocks are arranged at two ends of the locking stator along the circumferential direction, the cross sections of the limiting blocks are arc-shaped, the arc-shaped grooves are arranged along the circumferential direction of the rotating end plate, the limiting blocks at one end of the locking stator penetrate through the arc-shaped grooves to be fixedly connected with the connecting disc, the size of the arc-shaped grooves is larger than that of the limiting blocks, and the rotating end plate and the locking stator can rotate relatively.
3. The friction locking clamp according to claim 1, wherein the rotating end plate between the locking stator and the connecting disc is a first rotating end plate, the rotating end plate at the end of the locking stator away from the connecting disc is a second rotating end plate, and the connecting rod is located outside the locking stator.
4. A friction locking clamp according to claim 3, wherein the first rotating end plate is provided with a plurality of threaded holes, the second rotating end plate is provided with a plurality of through holes, one end of the connecting rod is in threaded connection with the threaded holes, and the other end of the connecting rod is connected with the fixing piece after passing through the through holes.
5. A friction locking type clamp according to claim 3, wherein a plurality of through grooves are formed in the rotating end plate in the radial direction, the limiting springs are arranged in the through grooves, one ends of the limiting springs are connected with the tail ends of the through grooves, the other ends of the limiting springs are connected with the moving blocks, and the corresponding moving blocks on the first rotating end plate and the second rotating end plate are connected through locking rollers.
6. The friction locking type clamp according to claim 4, wherein a cover plate is arranged on one side of the second rotating end plate away from the locking stator, a hole is formed in the center of the cover plate, and the edge of the cover plate is fixedly connected with the connecting rod.
7. A friction locking clamp according to claim 5 wherein said through slots and said arcuate slots are staggered.
8. A friction locking clamp according to claim 1, wherein the return spring extends annularly along the outer side of the locking stator, one end of the return spring being connected to the outer side of the locking stator, and the other end of the return spring being connected to the intermediate position of the connecting rod.
9. A friction locking clamp according to claim 5 wherein a circular aperture is provided in the middle of the rotatable end plate and the through slot communicates with the circular aperture.
10. A friction locking clamp according to claim 1 wherein the return spring acts on the rotating end plate to cause the locking roller to be normally located at the end of the arcuate surface near the centre of rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322623439.7U CN221047858U (en) | 2023-09-26 | 2023-09-26 | Friction locking type clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322623439.7U CN221047858U (en) | 2023-09-26 | 2023-09-26 | Friction locking type clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221047858U true CN221047858U (en) | 2024-05-31 |
Family
ID=91200644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322623439.7U Active CN221047858U (en) | 2023-09-26 | 2023-09-26 | Friction locking type clamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221047858U (en) |
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2023
- 2023-09-26 CN CN202322623439.7U patent/CN221047858U/en active Active
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