Clamp

Abstract

The embodiment of the invention discloses a clamp which comprises a first supporting component with a first working through hole, a second supporting component with a second working through hole and at least three clamping jaws, and a first gear part is arranged on the peripheral wall of the first working through hole; the central axis of the second working through hole is aligned with the central axis of the first working through hole, and the first supporting component and the second supporting component can rotate relatively; the clamping jaws are rotatably connected with the second supporting component and evenly arranged in the circumferential direction of the first working through hole, each clamping jaw is provided with a clamping face, a butt joint face and a second gear part, and in every two adjacent clamping jaws, the butt joint face of one clamping jaw is adjacent to and faces the clamping face of the other clamping jaw, so that a clamping cavity is defined by the clamping faces of at least three clamping jaws; and the first gear part is meshed with the second gear part, so that the at least three clamping jaws synchronously rotate to expand or shrink the clamping cavity. The included angle can be automatically centered, the size change range of the clamping cavity is large, the clamping force is large, and the workpiece applicability is good.

Description

Technical Field

[0001] The invention belongs to the technical field of workpiece clamping, and in particular relates to a clamp. Background Art

[0002] Clamps such as three-jaw chucks, six-jaw chucks, drill chucks and double V-block clamps are widely used for workpiece clamping. In the related art, the gaps between the clamping elements of the clamp are large, and a clamping cavity with a substantially closed periphery cannot be formed, which makes it easy for the workpiece to be misaligned and stuck during use. Due to the large gap between the clamping elements, when the workpiece size is small, the workpiece is easily stuck in the gap between the clamping elements during the clamping process, resulting in the inability to automatically align, and manual operation is required for secondary clamping. In addition, some other clamps in the related art, although the gaps between the clamping elements are small, can achieve automatic centering and clamping of the workpiece, but the clamping cavity size range varies little, and the applicability to the workpiece is poor. For example, the crimping block of the crimping pliers can form a generally closed jaws, but the size variation range of the jaws is small, and it cannot be used to clamp workpieces with a large size variation range. Moreover, the crimping block of the crimping pliers fits in the mating groove of the pliers body, and the crimping block is driven by manually operating the pliers handle. Therefore, the clamping force is small, and it cannot be used in situations that require a large clamping force. In addition, the gap between the crimping block and the mating groove will increase due to wear, affecting use, especially it cannot be used in situations where high clamping accuracy is required. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a clamp that can achieve automatic centering, has a large range of clamping cavity size variation, has a large clamping force, and has good workpiece applicability.

[0005] The clamp of the embodiment of the present invention comprises:

[0006] A first supporting member, wherein the first supporting member has a first working through hole, and a first gear portion is disposed on a peripheral wall of the first working through hole;

[0007] A second supporting member, wherein the second supporting member has a second working through hole, the central axis of the second working through hole is aligned with the central axis of the first working through hole, the second supporting member is connected to the first supporting member, and the first supporting member and the second supporting member can rotate relative to each other;

[0008] At least three clamping jaws are rotatably connected to the second supporting member and are evenly arranged along the circumference of the first working through hole. The clamping jaws have a clamping surface, a docking surface and a second gear portion, wherein the docking surface of one clamping jaw of two adjacent clamping jaws is adjacent to and faces the clamping surface of the other clamping jaw, so that the clamping surfaces of at least three clamping jaws form a clamping cavity for clamping a workpiece, wherein the first gear portion is meshed with the second gear portion, so that when the first supporting member and the second supporting member rotate relative to each other, at least three clamping jaws rotate synchronously to expand or shrink the clamping cavity.

[0009] The clamp of the embodiment of the present invention drives the clamping jaw to rotate by meshing the first gear portion and the second gear portion. The clamping jaw has a large clamping force, high precision, is not easy to wear, and has a prolonged service life. The size variation range of the clamping cavity is large, and automatic centering of the workpiece can be achieved, thereby preventing the workpiece from getting stuck and improving applicability.

[0010] In some embodiments, in two adjacent jaws, the distance between the butt joint surface of one jaw and the clamping surface of the other jaw is greater than or equal to zero and less than or equal to 5 mm.

[0011] In some embodiments, the first gear portion is an inner gear ring formed on the entire circumferential wall of the first working through hole or a plurality of inner gear ring segments spaced apart along the circumference of the first working through hole, and the inner gear ring segments correspond to the second gear portion.

[0012] In some embodiments, the number of the clamping jaws is 3-6.

[0013] In some embodiments, the first supporting component includes a fixed base, the second supporting component includes two rotating arms, the two rotating arms are rotatably mounted on the base and are respectively located on both sides of the base along the axial direction of the first working through hole, and the clamp is rotatably mounted between the two rotating arms through a pivot.

[0014] In some embodiments, the diameters of both ends of the first working through hole are enlarged to form an expanded hole section, and the rotating arm is provided with a flange surrounding the second working through hole, and the flange is rotatably engaged in the expanded hole section directly or through a bearing, and the pivot passes through the jaws and the flanges of the two rotating arms.

[0015] In some embodiments, the clamping jaw has a generally T-shaped structure and includes a clamping portion and a handle portion, one end of the handle portion is connected to the rear surface of the clamping portion, the second gear portion is arranged at the other end of the handle portion, the two ends of the clamping portion are respectively located in the second working through holes of the two rotating arms, the handle portion is provided with a pivot hole that cooperates with the pivot, the end face of the clamping portion is generally trapezoidal, the front surface of the clamping portion away from the handle portion is formed as the docking surface, and the bottom surface of the clamping portion is formed as the clamping surface.

[0016] In some embodiments, the first supporting component is a rotatable turntable, the second supporting component includes two fixed disks, the turntable is rotatably disposed between the two fixed disks along the axial direction of the first working through hole, and the clamp is rotatably installed between the two fixed disks through a pivot.

[0017] In some embodiments, the diameters of both ends of the first working through hole are enlarged to form expanded hole sections, and the two fixed plates are respectively fitted in the expanded hole sections. The side surface of the clamp is generally trapezoidal, and the clamp has a first end and a second end. The end surface area of ​​the first end is smaller than the end surface area of ​​the second end, the end surface of the first end of the clamp is formed as the docking surface, and the bottom surface of the clamp is formed as the clamping surface.

[0018] In some embodiments, the fixture also includes a base plate and a driving assembly for driving the turntable to rotate, the pivot is a hollow shaft, both ends of the pivot are respectively connected to the two fixed plates, the fixed plates are mounted on the base plate by fasteners passing through the fixed plates and the pivot, the driving assembly includes a motor and a worm connected to the motor, and an outer gear ring meshing with the worm is provided on the outer peripheral wall surface of the turntable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 2 is a three-dimensional schematic diagram of a clamp according to an embodiment of the present invention.

[0020] Figure 2 is an exploded view of a clamp according to an embodiment of the present invention.

[0021] Figure 3 2 is a three-dimensional schematic diagram of a clamping jaw of a clamp according to an embodiment of the present invention.

[0022] Figure 4 It is another three-dimensional schematic diagram of the clamping jaws with an included angle according to an embodiment of the present invention.

[0023] Figure 5 It is a partially cutaway stereoscopic schematic diagram of a clamp according to an embodiment of the present invention.

[0024] Figure 6 2 is a schematic cross-sectional view of a clamp according to an embodiment of the present invention.

[0025] Figure 7 The fixture of the embodiment of the present invention is along Figure 6 Schematic cross-sectional view of BB in FIG.

[0026] Figure 8 It is a schematic diagram of a state in which the clamping cavity of the clamp according to an embodiment of the present invention is opened to the maximum.

[0027] Fig. 9It is a schematic diagram of a state where the clamping cavity of the clamp according to an example of the present invention is closed to the minimum.

[0028] Fig.10 is an exploded view of a clamp according to another embodiment of the present invention.

[0029] Fig.11 It is a partially cutaway stereoscopic schematic diagram of a clamp according to another embodiment of the present invention.

[0030] Fig.12 1 is another partial cross-sectional perspective schematic diagram of a clamp according to another embodiment of the present invention.

[0031] Fig.13 It is a schematic diagram of a state in which the clamping cavity of a clamp according to another embodiment of the present invention is opened to the maximum.

[0032] Fig.14 It is a schematic diagram of a clamping cavity of another embodiment of the present invention being closed to its smallest state.

[0033] Reference numerals:

[0034] 100. Clamp;

[0035] 1. first supporting member; 11. first working through hole; 12. first gear portion; 13. base; 14. expansion section; 15. turntable; 16. connecting shaft; 17. outer gear ring;

[0036] 2. second supporting member; 21. second working through hole; 211. recess; 22. rotating arm; 23. flange; 24. bearing; 25. fixing plate; 26. shaft hole;

[0037] 3. Clamping jaw; 31. Clamping surface; 32. Butt joint surface; 33. Second gear portion; 34. Clamping cavity; 35. Clamping portion; 351. Rear surface; 352. Front surface; 353. Bottom surface; 36. Handle; 37. First end; 38. Second end; 39. Pivot hole;

[0038] 4. Pivot;

[0039] 5. Fasteners;

[0040] 6. Substrate;

[0041] 7. driving assembly; 71. motor; 72. worm;

[0042] 8. Workpiece. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0044] The clamp according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0045] like Figure 1-14 As shown, the clamp 100 according to the embodiment of the present invention comprises a first supporting component 1 , a second supporting component 2 and at least three clamping jaws 3 .

[0046] The first support component 1 has a first working through hole 11, and a first gear part 12 is provided on the peripheral wall of the first working through hole 11. The second support component 2 has a second working through hole 21, and the central axis of the second working through hole 21 is aligned with the central axis of the first working through hole 11. The second support component 2 is connected to the first support component 1, and the first support component 1 and the second support component 2 can rotate relative to each other. Here, it can be understood that the first support component and the second support component can rotate relative to each other, including three situations, the first support component can be a fixed stationary component, and the second support component is a rotating component; or the second support component is a fixed stationary component, and the first support component is a rotating component; or the first support component and the second support component are both rotating components, and the rotating components can be rotated manually or by a driving device.

[0047] Each of the at least three clamping jaws 3 is rotatably connected to the second supporting member 2 and is evenly arranged along the circumference of the first working through hole 11. The clamping jaw 3 has a clamping surface 31, a docking surface 32 and a second gear portion 33. Among two adjacent clamping jaws 3, the docking surface 32 of one clamping jaw 3 is adjacent to and faces the clamping surface 31 of the other clamping jaw 3, so that the clamping surfaces 31 of at least three clamping jaws 3 enclose a clamping cavity 34 for clamping the workpiece 8. Preferably, the number of clamping jaws can be 3-6, which can not only ensure the formation of the clamping cavity, but also reduce the number of clamping jaws, and the structure of the clamp is simplified and compact, which is convenient for miniaturization of the clamp.

[0048] Here, it can be understood that the butt joint surface of one jaw adjacent to the clamping surface of another jaw means that the butt joint surface of one jaw can contact with the clamping surface of another adjacent jaw or the distance between them is very small, for example, less than 10 mm, which is referred to as the circumferentially basically closed clamping cavity.

[0049] The first gear portion 12 meshes with the second gear portion 33 , so that when the first supporting member 1 and the second supporting member 2 rotate relatively, at least three clamping jaws 3 are driven to rotate synchronously, thereby expanding or contracting the clamping cavity 34 .

[0050] The clamp of the embodiment of the present invention drives the jaws to rotate through gear meshing, and the jaws have a large clamping force, high precision, low wear, and a long service life. Compared with the three-jaw chuck, six-jaw chuck, drill chuck, double V-block clamp and other clamps in the related art, the size (area) of the clamping cavity has a larger range of variation, and is suitable for workpieces with a large range of size variations, thereby improving applicability. For example, the clamp of the embodiment of the present invention can be used to clamp a connector to detect the holding force of the connector's contact piece, and can be used to clamp an umbrella, etc., for detecting the umbrella.

[0051] In addition, in the clamp of the embodiment of the present invention, at least three clamping jaws are evenly arranged along the circumference of the first working through hole, the clamping cavity always expands or shrinks with the central axis of the first working through hole as the center, and the clamping cavity always presents a regular polygon, which can realize automatic centering of the workpiece.

[0052] In the clamp of the embodiment of the present invention, the first supporting component can be used as a fixed stationary component, and the second supporting component is a rotating component, for example, driven to rotate manually or by a driving device. In this case, when the second supporting component rotates relative to the first supporting component, at least three clamping jaws rotate synchronously and revolve around the central axis of the first working through hole. Optionally, the second supporting component can be used as a fixed stationary component, and the first supporting component is a rotating component, for example, driven to rotate manually or by a driving device. In this case, when the first supporting component rotates relative to the second supporting component, at least three clamping jaws rotate synchronously but do not revolve. Of course, the first supporting component and the second supporting component can be rotating components at the same time. In this case, when the first supporting component and the second supporting component rotate relative to each other, at least three clamping jaws rotate synchronously and revolve around the central axis of the first working through hole.

[0053] Preferably, in two adjacent clamping jaws 3, the distance between the butt joint surface 32 of one clamping jaw 3 and the clamping surface 31 of the other clamping jaw 3 is greater than or equal to zero and less than or equal to 5 mm. For example, in two adjacent clamping jaws 3, the distance between the butt joint surface 32 of one clamping jaw 3 and the clamping surface 31 of the other clamping jaw 3 can be 0, 1 mm, 1.25 mm, 2 mm, 3.8 mm, 4 mm, 4.5 mm or 5 mm.

[0054] When the above spacing is 0, the mating surface of one clamping jaw contacts and fits with the clamping surface of another adjacent clamping jaw and can slide relatively, and the circumference of the clamping cavity is basically completely closed, which can prevent very small workpieces such as connectors from being stuck between two adjacent clamping jaws.

[0055] When the above-mentioned spacing is greater than 0 and less than or equal to 5mm, there is a gap between the mating surface of one jaw and the clamping surface of another adjacent jaw, but compared with the gap between the clamping elements of the clamp in the related technology, the gap is very small, thereby avoiding the workpiece from being stuck between two adjacent jaws, and can reduce the difficulty of processing and assembling parts, reduce costs and improve practicality.

[0056] In some embodiments, the first gear portion 12 may be configured as an inner gear ring formed on the entire circumferential wall of the first working through hole 11, that is, the first gear portion may be a complete annular inner gear ring formed on the entire circumferential wall of the first working through hole 11. Optionally, the first gear portion 12 is configured as a plurality of inner gear ring segments spaced apart along the circumference of the first working through hole 11, and the plurality of inner gear ring segments correspond to the second gear portion 33. The number of the inner gear ring segments may be the same as the number of the second gear portions (that is, the number of the clamping jaws). Optionally, the number of the inner gear ring segments may be less than the number of the second gear portions, for example, two second gear portions correspondingly mesh with one inner gear ring segment.

[0057] Preferably, the clamping surface 31 of the clamping jaw 3 is provided with anti-skid patterns or clamping teeth to improve the clamping force and clamping reliability of the workpiece 8 and avoid slipping when clamping the workpiece.

[0058] Reference below Figure 1-9 The clamp 100 according to some specific embodiments of the present invention is described.

[0059] like Figure 1-Figure 9 As shown, the clamp 100 of some specific embodiments of the present invention comprises a first support member 1, a second support member 2 and six clamping jaws 3, wherein the first support member 1 is configured as a fixed base 13, and the second support member 2 is configured as two rotating arms 22. It can be understood that in the description of this embodiment, the base and the first support member can refer to the same component and be described interchangeably, and the second support member and the rotating arm can refer to the same component and be described interchangeably.

[0060] The two rotating arms 22 are rotatably mounted on the base 13 and are respectively located at two sides of the base 13 along the axial direction of the first working through hole 11 . The clamping jaw 3 is rotatably mounted between the two rotating arms 22 via a pivot 4 .

[0061] like Figure 1-Figure 2 and Figure 5-Figure 6 As shown, the base 3 is generally Ω-shaped, the first working through hole 11 is a circular hole and is arranged along the thickness direction of the base 13 ( Figure 1 The first gear portion 12 is an inner gear ring formed on the entire peripheral wall of the first working through hole 11.

[0062] like Figure 1 and Figure 7 As shown, the diameters of both ends of the first working through hole 11 are enlarged to form an expanded hole section 14. In other words, the first working through hole 11 is divided into three sections, and the diameter of the middle part is smaller than the diameters of the two ends, so that an annular boss is formed in the middle of the first working through hole 11, and an inner gear ring 12 is formed on the inner circumferential surface of the annular boss.

[0063] The rotating arm 22 is plate-shaped, the first end of the rotating arm 22 is semicircular and has a greater width than the second end, the second working through hole 21 is formed at the first end of the rotating arm 22, and a flange 23 surrounding the second working through hole 21 is provided on the surface of the first end of the rotating arm 22 facing the base 13, the flange 23 is rotatably fitted in the reaming section 14 directly or through a bearing 24 and is stopped by the annular boss in the middle of the first working through hole. The cooperation between the reaming section 14 and the flange 23 forms a limit for the rotating arm, the alignment installation between the base 13 and the rotating arm 22 is convenient and reliable, and the stability between the rotating arm 22 and the base 13 is better.

[0064] The clamping jaw 3 is provided with a pivot hole, and the first end of the rotating arm 22 is provided with an axial hole 26 surrounding the second working through hole 21 and penetrating the flange 23. The pivot 4 penetrates the pivot hole 39 of the clamping jaw 3 and the axial holes 26 of the two rotating arms 22, so that the clamping jaw 3 is installed on the two rotating arms 22.

[0065] Optionally, a connecting shaft 16 is provided between the second ends of the two rotating arms 22 away from the second working through hole 21 to increase the overall structural stability and firmness of the two rotating arms 22. The user can manually drive the connecting shaft 16 to rotate the two rotating arms 22. Optionally, the connecting shaft 16 can be connected to a driving component such as an electric push rod, a hydraulic cylinder, etc. to drive the two rotating arms 22 to rotate synchronously.

[0066] like Figure 3-Figure 7 As shown, the clamping jaw 3 has a generally T-shaped structure and includes a clamping portion 35 and a handle portion 36. One end of the handle portion 36 is connected to the rear surface 351 of the clamping portion 35, and the second gear portion 33 is provided at the other end of the handle portion 36 (i.e., the free end of the handle portion 36). The two ends of the clamping portion 35 are respectively located in the second working through holes 21 of the two rotating arms 22, as shown in FIG. Figure 2 As shown, the outer circumference of the second through hole 21 has a plurality of spaced-apart recesses 211 , and both ends of the clamping portion 35 are formed to match the shapes of the recesses 211 .

[0067] The pivot hole 39 is provided on the handle 36 . The end surface of the chuck portion 35 is substantially trapezoidal. The front surface 352 of the chuck portion 35 away from the handle 36 is formed as the butt surface 32 . The bottom surface 353 of the chuck portion 35 is formed as the clamping surface 31 .

[0068] In other words, the chuck portion 35 and the shank portion 36 are generally T-shaped, and the axial length of the chuck portion 35 in the second working through hole 21 is greater than the width of the shank portion 36 , so that the clamping surface 31 of the chuck portion 35 has a larger area, thereby improving the clamping effect on the workpiece 8 .

[0069] By driving the rotating arm 22 to swing in different directions, the clamping jaw 3 rotates in different directions, so that the clamping cavity 34 is expanded or reduced. Figure 8 The clamping cavity 34 is shown in the state of being expanded to the maximum. Fig. 9 The clamping cavity 34 is shown in a state where it is contracted to the minimum.

[0070] When in use, the clamping cavity 34 is opened to the maximum, the workpiece 8 is placed in the clamping cavity 34, and then the two rotating arms 22 are driven manually or by a driving component to swing synchronously relative to the base 13, so that the six clamping jaws 3 revolve around the center of the first working hole 11 and the second working hole 22 with the rotating arm 22, and the six clamping jaws 3 are driven to rotate synchronously around the pivot 4 through the meshing of the second gear part 33 and the inner gear ring 12, and the docking surface 32 of any clamping jaw moves relative to the clamping surface 31 of another adjacent clamping jaw toward the docking surface 32 of the other clamping jaw, so that the clamping cavity 34 gradually shrinks and clamps the workpiece 8. When the workpiece 8 is to be removed, the rotating arm 22 is rotated in the opposite direction, and the docking surface 32 of any clamping jaw moves relative to the clamping surface 31 of another adjacent clamping jaw toward the second gear part 33 of the other clamping jaw, so that the clamping cavity 34 gradually expands and opens to release the workpiece 8.

[0071] Reference below Figure 10-Figure 14 The clamp 100 according to some other specific embodiments of the present invention will be described.

[0072] like Figure 10-Figure 14 As shown, the clamp 100 of some other specific embodiments of the present invention comprises a first supporting member 1, a second supporting member 2 and four clamping jaws 3, wherein the first supporting member 1 is configured as a rotatable turntable 15, and the second supporting member 2 is configured as two stationary fixed disks 25. It can be understood that in the description of this embodiment, the turntable and the first supporting member can refer to the same component and be described interchangeably, and the second supporting member and the fixed disk can refer to the same component and be described interchangeably.

[0073] The rotating disk 15 is annular in shape and is rotatably disposed between two fixed disks 25 along the axial direction of the first working through hole 11 . The four clamping jaws 3 are rotatably installed between the two fixed disks 25 via the pivot 4 .

[0074] The first working through hole 11 is a circular hole and the diameters of both ends are enlarged to form an expanded hole section 14. In other words, the first working through hole 11 is divided into three sections, with large diameters at both ends and a small diameter in the middle, so that an annular boss is formed in the middle of the first working through hole 11, and an inner gear ring 12 serving as a first gear part is provided on the peripheral wall of the annular boss. The fixed disk 15 is fitted in the expanded hole section 14 and stopped by the annular boss.

[0075] The side surface of the clamping jaw 3 is generally trapezoidal, and the clamping jaw 3 has a first end 37 and a second end 38. The end surface area of ​​the first end 37 is smaller than the end surface area of ​​the second end 38. The end surface of the first end 37 of the clamping jaw 3 is formed as a docking surface 32, and the bottom surface 353 of the clamping jaw 3 is formed as a clamping surface 31. The second gear portion 33 is formed at the intersection of the second end surface of the clamping jaw 3 and the upper surface.

[0076] like Fig.10 and Fig.11As shown, the fixture 100 also includes a base plate 6 and a driving assembly 7 for driving the turntable 15 to rotate. The pivot 4 is a hollow shaft. The two ends of the pivot 4 are respectively connected to two fixed disks 25. The fixed disks 25 are mounted on the base plate 6 by fasteners 5 passing through the fixed disks 25 and the pivot 4 so that the fixed disks 25 are fixed. By arranging the fasteners 5 in the pivot 4, the two fixed disks 25 can be connected together and fixed on the base plate 6, and the turntable 15 can rotate relative to the fixed disks 25. Optionally, the fasteners 5 can be bolts. The fasteners 5 are arranged in the inner cavity of the pivot 4, which can make the structure more compact. Multiple fasteners 5 can be arranged in the circumference of the fixed disks 25, which can improve the stability of the connection structure between the fixed disks 25 and between them and the base plate 6.

[0077] The driving assembly 7 includes a motor 71 and a worm 72 connected to the motor 71 . An outer gear ring 17 meshing with the worm 72 is provided on the outer peripheral wall surface of the rotating disk 15 . The outer gear ring 17 may also be called a worm wheel.

[0078] The motor 71 drives the worm 72 to rotate in the first direction, driving the rotating disk 15 to rotate relative to the fixed disk 25. Since the inner gear ring 12 is meshed with the second gear portion 33 of the clamping jaw 3, the clamping jaw 3 is driven to swing around the pivot 4, and the clamping cavity 34 is gradually opened to the maximum. Fig.13 When the motor 71 rotates in a second direction opposite to the first direction, the turntable 15 reverses, thereby driving the clamping jaws 3 to reverse, and the clamping cavity 34 gradually shrinks to a minimum, as shown in FIG. Fig.14 In some embodiments, Fig.14 As shown, the area of ​​the clamping cavity 34 can be reduced to almost zero. Preferably, in order to reduce the machining accuracy requirement, when the clamping cavity 34 is reduced to the minimum state, the area of ​​the clamping cavity 34 is greater than zero.

[0079] In the clamp of the embodiment of the present invention, the motor drives the turntable to rotate through the worm gear pair, and the clamping jaws are driven to rotate by the turntable through the gear pair, so that the clamping jaws have a large clamping force, a good clamping effect, are not easy to wear after a period of use, and have high precision. The size of the clamping cavity varies in a wide range, can clamp very small workpieces, has good applicability, and can automatically center the workpiece. The gap between the clamping jaws can be very small, can be completely closed, and improves the reliability of use.

[0080] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least three, such as three, four, etc., unless otherwise clearly and specifically defined.

[0082] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0084] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A clamp, characterized in that: include: A first supporting member, wherein the first supporting member has a first working through hole, and a first gear portion is disposed on a peripheral wall of the first working through hole; A second supporting member, wherein the second supporting member has a second working through hole, the central axis of the second working through hole is aligned with the central axis of the first working through hole, the second supporting member is connected to the first supporting member, and the first supporting member and the second supporting member can rotate relative to each other; At least three clamping jaws are rotatably connected to the second supporting member and are evenly arranged along the circumference of the first working through hole. The clamping jaws have a clamping surface, a docking surface and a second gear portion, wherein the docking surface of one clamping jaw of two adjacent clamping jaws is adjacent to and faces the clamping surface of the other clamping jaw, so that the clamping surfaces of at least three clamping jaws form a clamping cavity for clamping a workpiece, wherein the first gear portion is meshed with the second gear portion, so that when the first supporting member and the second supporting member rotate relative to each other, at least three clamping jaws rotate synchronously to expand or shrink the clamping cavity.

2. The clamp according to claim 1, characterized in that: In two adjacent clamping jaws, the distance between the butt joint surface of one clamping jaw and the clamping surface of the other clamping jaw is greater than or equal to zero and less than or equal to 5 mm.

3. The clamp according to claim 1, characterized in that: The first gear portion is an inner gear ring formed on the entire circumferential wall of the first working through hole or a plurality of inner gear ring segments spaced apart along the circumference of the first working through hole, and the inner gear ring segments correspond to the second gear portion.

4. The clamp according to claim 1, characterized in that: The number of the clamping jaws is 3-6.

5. The clamp according to any one of claims 1 to 4, characterized in that: The first supporting component includes a fixed base, and the second supporting component includes two rotating arms. The two rotating arms are rotatably mounted on the base and are respectively located on both sides of the base along the axial direction of the first working through hole. The clamp is rotatably mounted between the two rotating arms through a pivot.

6. The clamp according to claim 5, characterized in that The diameters of both ends of the first working through hole are enlarged to form an expanded hole section. The rotating arm is provided with a flange surrounding the second working through hole. The flange is rotatably engaged in the expanded hole section directly or through a bearing. The pivot passes through the clamp and the flanges of the two rotating arms.

7. The clamp according to claim 6, characterized in that The clamping jaw has a generally T-shaped structure and includes a clamping portion and a handle portion, one end of the handle portion is connected to the rear surface of the clamping portion, the second gear portion is arranged at the other end of the handle portion, the two ends of the clamping portion are respectively located in the second working through holes of the two rotating arms, the handle portion is provided with a pivot hole that cooperates with the pivot, the end surface of the clamping portion is generally trapezoidal, the front surface of the clamping portion away from the handle portion is formed as the docking surface, and the bottom surface of the clamping portion is formed as the clamping surface.

8. The clamp according to any one of claims 1 to 4, characterized in that: The first supporting component is a rotatable turntable, the second supporting component includes two fixed disks, the turntable is rotatably arranged between the two fixed disks along the axial direction of the first working through hole, and the clamp is rotatably installed between the two fixed disks through a pivot.

9. The clamp according to claim 8, characterized in that The diameters of both ends of the first working through hole are enlarged to form expanded hole sections, and the two fixed plates are respectively fitted in the expanded hole sections. The side surface of the clamp is generally trapezoidal, and the clamp has a first end and a second end. The end surface area of ​​the first end is smaller than the end surface area of ​​the second end. The end surface of the first end of the clamp is formed as the docking surface, and the bottom surface of the clamp is formed as the clamping surface.

10. The clamp according to claim 8, characterized in that The fixture also includes a base plate and a driving assembly for driving the turntable to rotate, the pivot is a hollow shaft, the two ends of the pivot are respectively connected to the two fixed plates, the fixed plates are mounted on the base plate by fasteners passing through the fixed plates and the pivot, the driving assembly includes a motor and a worm connected to the motor, and an outer gear ring meshing with the worm is provided on the outer peripheral wall surface of the turntable.

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