Clamp

Abstract

The utility model relates to a clamp which comprises a chuck, an inner ring, a plurality of elastic connecting pieces and a plurality of clamping arms. The inner ring is arranged in the chuck and can rotate relative to the chuck plane; the chuck is connected with the inner ring through the elastic connecting piece; one end of each clamping arm is connected to the chuck and the inner ring at the same time, and the other end of each clamping arm is gathered at the center of the inner ring. The clamp can quickly and accurately position and fix the workpiece to be machined, is simple in structure and convenient to operate, greatly shortens the fixing time of the workpiece to be machined, and improves the machining speed and accuracy.

Description

Technical Field

[0001] The utility model relates to the field of machining machine tools, in particular to a clamp. Background Art

[0002] Ordinary lathes, economical CNC lathes, milling machines, drilling machines and other machine tools require clamping devices to fix the workpiece to be processed during the processing. However, when clamping workpieces of different sizes or when workpieces need to be processed on multiple sides, existing clamping devices mostly use mechanical connection methods such as bolts to fix the workpiece, which requires manual adjustment. On the one hand, the steps are cumbersome, time-consuming and labor-intensive, affecting processing efficiency; on the other hand, it may cause damage to the workpiece to be processed. In addition, the accuracy of manual adjustment cannot be guaranteed, and it is difficult to ensure position accuracy, which affects the accuracy of workpiece processing. Utility Model Content

[0003] In view of the above problems, the purpose of the present invention is to provide a clamp that can quickly and accurately position and fix the workpiece to be processed, has a simple structure, is easy to operate, and greatly improves the processing speed and accuracy.

[0004] A clamp comprises a chuck, an inner ring, a plurality of elastic connectors and a plurality of clamp arms; the inner ring is arranged in the chuck and can rotate relative to the chuck plane; the chuck and the inner ring are connected by the elastic connector; one end of the clamp arm is connected to the chuck and the inner ring at the same time, and the other end is gathered at the center of the inner ring.

[0005] The clamp described in the present invention is provided with a chuck and an inner ring that can rotate relative to a plane, and the clamp arm is fixed to the chuck and the inner ring at the same time, so that when the chuck and the inner ring rotate relative to each other, the clamp arm swings, and the inner diameter of the clamp increases away from the center of the inner ring, so that it is used to clamp workpieces of different sizes; moreover, the chuck and the inner ring are connected by an elastic connecting member, and the elastic connecting member is compressed or stretched when the chuck and the inner ring rotate relative to each other. After the operator fixes the workpiece, under the elastic action of the elastic connecting member, the chuck and the inner ring automatically rotate relative to each other in the opposite direction, so that the clamp arm swings and contracts in the opposite direction, thereby fixing the workpiece. The clamp of the present invention can not only fix the workpiece, but also eliminate the need for manual positioning of the workpiece, and eliminate the need for fixing the workpiece by mechanical connection methods such as disassembling bolts, and can effectively prevent the workpiece from being excessively squeezed and deformed, greatly shortening the fixing time of the workpiece, and is simple and convenient to operate, saving time and effort, and improving processing efficiency and processing accuracy.

[0006] Furthermore, the clamping arm includes an arm body and a claw head detachably fixed to the arm body; the two ends of the arm body are respectively a connecting end and a fixed end; the connecting end includes a first connecting portion and a second connecting portion; the first connecting portion is connected to the inner ring, and the second connecting portion is connected to the chuck; the fixed end is gathered at the center of the inner ring; the claw head is detachably fixed to the fixed end. The operator can replace the appropriate claw head to fix the workpiece according to the shape, material, and processing requirements.

[0007] Furthermore, the clamp also includes a locking mechanism disposed at the connection between the chuck and the inner ring. The locking mechanism includes slots evenly and densely distributed on the outer surface of the inner ring, a plurality of locking springs fixed to the inner side of the chuck, and steel balls. The locking springs force the steel balls against the slots on the outer surface of the inner ring. When the inner ring rotates relative to the chuck, the steel balls move along the outer surface of the inner ring. When the inner ring stops rotating relative to the chuck, the steel balls are trapped in the nearest slots, preventing the chuck and inner ring from rotating relative to each other. This prevents the elastic action of the elastic connector from causing the chuck and inner ring to rotate during machining, thereby causing vibration of the clamp arm and affecting machining accuracy.

[0008] Furthermore, the chuck includes a base plate and an annular side wall fixed to the base plate, the side wall having an outer through hole; a first connecting post fixed to the base plate is disposed within the outer through hole; a second connecting post corresponding to the outer through hole is disposed on the outer ring wall of the inner ring, and the elastic connector is connected between the first and second connecting posts. The elastic connector is not subjected to force.

[0009] Furthermore, the second connecting post is located counterclockwise of the first connecting post; when the inner ring rotates clockwise relative to the chuck, the second connecting post rotates clockwise with the inner ring and approaches the first connecting post, and the elastic connector is compressed. Conversely, when the inner ring rotates counterclockwise relative to the chuck, the second connecting post rotates counterclockwise with the inner ring and moves away from the first connecting post, and the elastic connector is stretched. In other embodiments, the second connecting post may also be set at a clockwise position of the first connecting post; the operator may select the direction of movement of the inner ring relative to the chuck according to the design requirements of the machining center or the operator's operating habits, or may choose to use the pulling force or tension of the elastic connector to automatically cause the chuck and the inner ring to rotate relative to each other in the opposite direction, thereby achieving reverse swinging and contraction of the clamping arm.

[0010] Furthermore, a plurality of annular evenly distributed guide rails are provided on the top or bottom of the inner ring; the second connecting portion is hinged to the bottom plate and / or the side wall; the first connecting portion is connected to the guide rail via a latch, and the latch and the first connecting portion can slide along the guide rail.

[0011] A plurality of accommodating cavities are provided on the side wall positions corresponding to the clamping arms; the first connecting portion is hinged on the inner ring, and the second connecting portion is provided in the accommodating cavity; when the inner ring rotates relative to the chuck, the first connecting portion rotates with the inner ring, and at the same time, the second connecting portion moves in the gap in the accommodating cavity.

[0012] Furthermore, the number of the clamping arms is 3.

[0013] Furthermore, the elastic connecting member is a spring.

[0014] Furthermore, a handle is provided on the outer surface of the inner ring or the chuck to enable it to rotate. The operator can turn the handle to make the inner ring and the chuck rotate relative to each other, which not only saves effort but also allows the inner diameter of the clamp to be adjusted with one hand, making the operation simple and convenient.

[0015] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a clamp structure according to the utility model;

[0017] Figure 2 This is a schematic diagram of the connection between the clamping arm and the chuck of the utility model;

[0018] Figure 3 This is a schematic diagram of the connection between the clamp arm, the inner ring and the locking mechanism of the present invention;

[0019] Figure 4 This is a schematic diagram of the three clamp arms assembly of the present invention;

[0020] Figure 5 This is a schematic diagram of a single clamp arm structure of the present invention. DETAILED DESCRIPTION

[0021] It should be clear that the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the embodiments of the present application.

[0022] The terms used in the embodiments of this application are for the purpose of describing specific embodiments only and are not intended to limit the embodiments of this application. The singular forms "a," "an," "the," and "the" used in the embodiments of this application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0023] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0024] In the description of this application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. The orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] In addition, in this application, unless otherwise specified, "plurality" refers to two or more. "And / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0027] It should be understood that the embodiments of the present application are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the embodiments of the present application is limited only by the appended claims.

[0028] See also Figure 1-5 The clamp described in the present invention includes a chuck 2, an inner ring 4, three identical elastic connectors 6, and three identical clamping arms 8. The inner ring 4 is disposed in the chuck 2 and can rotate relative to the plane of the chuck 2. The chuck 2 and the inner ring 4 are connected by the elastic connector 6, and the elastic connector 6 is compressed when the inner ring 4 rotates relative to the chuck 2. One end of the three clamping arms 8 is connected to both the chuck 2 and the inner ring 4, and the other ends are gathered at the center of the inner ring 4 to fix the workpiece to be processed. The clamping arms 8 can swing relative to the chuck 2 and the inner ring 4.

[0029] The chuck 2 includes a base plate 22 and an annular side wall 24 fixed to the base plate 22. The side wall 24 is provided with three outer through holes 242 of the same shape and size, evenly distributed in an annular pattern. The base plate 22 is provided with a first through hole 222 and three identical first connecting posts 224, evenly distributed in an annular pattern. The three first connecting posts 224 are disposed at the same position within the outer through hole 242. A handle through hole 246 is also provided on the side wall 24 between two adjacent outer through holes 242.

[0030] The inner ring 4 is mounted on the base plate 22, surrounded by the sidewall 24. The outer diameter of the inner ring 4 matches the inner diameter of the sidewall 24, which is the same as the diameter of the first through-hole 222. The inner ring 4 is provided with three evenly distributed inner through-holes 42, corresponding to the sidewall 24 between two adjacent outer through-holes 242 of the chuck 2. A handle 44 is provided on the inner ring 4, corresponding to the handle through-hole 246 of the chuck 2. The handle 44 extends through the handle through-hole 246 and protrudes from the outside of the chuck 2. The handle 44 can swing within the handle through-hole 246. In other embodiments, the handle 44 can also be located on the top surface of the inner ring 4. In other embodiments, the handle 44 can also be located on the outer surface of the chuck 2. Three second connecting posts 46 are evenly distributed in an annular pattern on the side surface of the inner ring 4. These second connecting posts 46 are located at the same position within the outer through-hole 242 and counterclockwise from the first connecting posts 224. When the inner ring 4 rotates clockwise relative to the chuck 2, the second connecting posts 46 rotate clockwise with the inner ring 4 and approach the first connecting posts 224. Three guide rails 49 are also provided on the top or bottom of the inner ring 4.

[0031] The elastic connecting member 6 is preferably a connecting spring; one end of the connecting spring is fixedly connected to the first connecting column 224 of the chuck 2, and the other end is fixedly connected to the second connecting column 46 of the inner ring 4 in the same outer through hole 242; when the inner ring 4 rotates clockwise relative to the chuck 2, the second connecting column 46 moves close to the first connecting column 224, and the elastic connecting member 6 is compressed.

[0032] The clamping arm 8 includes an arm body 82, a connecting assembly 84, and a claw head 86 detachably fixed to the arm body 82 via the connecting assembly 84, and the claw head 86 is used to fix the workpiece to be processed. The two ends of the arm body 82 are respectively a connecting end 822 and a fixed end 824; the connecting end 822 includes a first connecting portion 8222 and a second connecting portion 8224; the first connecting portions 8222 of the three clamping arms 8 are respectively connected to the guide rail 49 of the inner ring 4 via a latch member 47, the latch member 47 passes through the first connecting portion 8222 and is inserted into the guide rail 49, and the latch member 47 and the first connecting portion 8222 can slide along the guide rail 49; the second connecting portions 8224 of the three clamping arms 8 are respectively hinged to the base plate 22 and / or the side wall 24 corresponding to the chuck 2. The fixed ends 824 of the three clamp arms 8 are gathered at the center of the inner ring 4; the fixed end 824 is provided with a receiving groove 8242, and a slot hole is provided on the groove wall of the receiving groove 8242; the claw head 86 is provided with a connecting hole; the connecting component 84 is a screw 842 and a locking nut 844 matching the screw; the claw head 86 is arranged in the receiving groove 8242, the screw 842 passes through the slot hole and the connecting hole of the claw head 86, and the locking nut 844 fixes the claw head 86 and the arm body 82.

[0033] In other embodiments, the first connecting portion 8222 can also be fixedly connected to the inner ring 4, and a receiving cavity for accommodating the second connecting portion 8224 is provided in the side wall 24 corresponding to the clamping arm 8, and the second connecting portion 8224 is arranged in the receiving cavity; when the inner ring 4 rotates relative to the chuck 2, the first connecting portion 8222 rotates with the inner ring 4, and at the same time, the second connecting portion 8224 moves in the cavity.

[0034] As a further improvement of the above scheme, the clamp also includes a locking mechanism arranged at the connection between the chuck 2 and the inner ring 4; the locking mechanism includes a groove 48 evenly and densely distributed on the outer surface of the inner ring, two locking springs 248 and a steel ball 249 fixed to the inner side of the side wall 24 of the chuck 2; the surface of the groove 48 is smooth; two grooves 247 are provided on the inner side of the side wall 24 of the chuck 2, the locking spring 248 and the steel ball 249 are arranged in the groove 247, and the locking spring 248 presses the steel ball 249 against the groove 48 on the outer surface of the inner ring 4.

[0035] When the clamp described in the present invention is used, after the operator fixes the chuck 2 and installs the appropriate claw head 86, he only needs to turn the handle 44 clockwise with one hand to make the inner ring 4 rotate clockwise relative to the chuck 2. At this time, the connecting spring fixedly connected to the chuck 2 and the inner ring 4 is compressed, the first connecting part 8222 slides along the guide rail 49 of the inner ring 4, the clamp arm 8 swings clockwise, and the fixed end 824 of the clamp arm 8 and the claw head 86 move away from the center point of the inner ring 4; the operator places the workpiece to be processed in the middle of the clamp with the other hand and releases the handle. , under the elastic force of the connecting spring, the inner ring 4 rotates counterclockwise relative to the chuck 2, the first connecting portion 8222 slides in the opposite direction along the guide rail 49 of the inner ring 4, the clamping arm 8 swings counterclockwise, the fixed end 824 of the clamping arm 8 and the claw head 86 gather toward the center point of the inner ring 4, and the claw head 86 fixes the workpiece to be processed; a clamp of the utility model can not only quickly fix the workpiece to be processed, but also does not require manual positioning of the position of the workpiece to be processed, greatly shortens the fixing time of the workpiece to be processed, is simple and convenient to operate, saves time and effort, and improves processing efficiency and processing accuracy.

[0036] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the concept of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A clamp, characterized in that: The invention comprises a chuck, an inner ring, a plurality of elastic connecting members and a plurality of clamping arms; the inner ring is arranged in the chuck and can rotate relative to the plane of the chuck; the chuck and the inner ring are connected by the elastic connecting member; one end of the clamping arm is connected to the chuck and the inner ring at the same time, and the other end is gathered at the center of the inner ring; the clamping arm comprises an arm body and a claw head detachably fixed to the arm body; the two ends of the arm body are respectively a connecting end and a fixed end; when the inner ring rotates clockwise relative to the chuck, the elastic connecting member is compressed, and the fixed end of the clamping arm and the claw head move away from the center point of the inner ring; when the inner ring rotates counterclockwise relative to the chuck, the fixed end of the clamping arm and the claw head gather toward the center point of the inner ring.

2. A clamp according to claim 1, characterized in that: The clamping arm includes an arm body and a claw head detachably fixed to the arm body; the two ends of the arm body are respectively a connecting end and a fixed end; the connecting end includes a first connecting part and a second connecting part; the first connecting part is connected to the inner ring, and the second connecting part is connected to the chuck; the fixed end gathers at the center of the inner ring; the claw head is detachably fixed to the fixed end.

3. A clamp according to claim 2, characterized in that: The clamp also includes a locking mechanism arranged at the connection between the chuck and the inner ring, and the locking mechanism includes a groove evenly and densely distributed on the outer surface of the inner ring, a plurality of locking springs and steel balls fixed to the inner side of the chuck; the locking spring presses the steel ball against the groove on the outer surface of the inner ring.

4. A clamp according to claim 3, characterized in that: The chuck includes a base plate and an annular side wall fixed to the base plate, the side wall is provided with an outer through hole; a first connecting column fixed to the base plate is provided in the outer through hole; a second connecting column corresponding to the outer through hole is provided on the outer ring wall of the inner ring, and the elastic connecting member is connected between the first connecting column and the second connecting column.

5. A clamp according to claim 4, characterized in that: The second connecting post is located counterclockwise of the first connecting post; when the inner ring rotates clockwise relative to the chuck, the second connecting post rotates clockwise with the inner ring and approaches the first connecting post, and the elastic connecting member is compressed.

6. A clamp according to claim 5, characterized in that: The top or bottom of the inner ring is provided with a plurality of guide rails evenly distributed in an annular shape; the second connecting portion is hinged to the bottom plate and / or the side wall; the first connecting portion is connected to the guide rail via a latch, and the latch and the first connecting portion can slide along the guide rail.

7. The clamp according to claim 5, characterized in that: The clamping arm is provided with a plurality of accommodating cavities at positions corresponding to the side walls; the first connecting portion is hinged on the inner ring, and the second connecting portion is arranged in the accommodating cavity; when the inner ring rotates relative to the chuck, the first connecting portion rotates with the inner ring, and the second connecting portion moves in the gap in the side wall.

8. A clamp according to any one of claims 6-7, characterized in that: The number of the clamping arms is 3.

9. The clamp according to claim 8, characterized in that: The elastic connecting member is a spring.

10. The clamp according to claim 9, characterized in that: The inner ring or the outer surface of the chuck is provided with a handle for rotating the chuck.

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