A two jaw chuck

Abstract

The utility model discloses a two -jaw chuck, including chuck seat, the mirror image is connected with two first support seat on the chuck seat, each first support seat is rotatably connected with the pivot, the first external thread and the second external thread are respectively mirror image and are set up on the pivot, the spiral direction of first external thread and second external thread is opposite, first external thread and second external thread all are screw -threaded with a second support seat, each second support seat is screw -threaded with the clamping assembly of clamping part, still install two locking assemblies for clamping pivot on the chuck seat. The utility model discloses through the working principle of screw rod drive when rotating the pivot, two clamping pincers will simultaneously synchronous relative or deviate from the movement, like this when two clamping pincers clamp the workpiece, the pivot midpoint is also the center point of workpiece, guarantees the machining accuracy.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, and in particular to a two-jaw chuck. Background Technology

[0002] To facilitate the processing of parts on machine tools, chucks are needed to clamp the parts to be processed. Different types of chucks are required for different types of parts. Three-jaw chucks are suitable for clamping bar-shaped materials, while two-jaw chucks can easily clamp plate-shaped materials.

[0003] Chinese patent publication CN218015814U discloses a two-jaw chuck for a lathe, comprising a body and two jaws. The body has an internal telescopic cavity and a strip-shaped through hole. A connecting rod is installed in the telescopic cavity, and a pressure rod is installed in the strip-shaped through hole. One end of the connecting rod is hinged to the pressure rod, and the other end is hinged to the slider. A locking ring is installed on the outside of the body and is threadedly connected to the body. Rotating the locking ring drives the pressure rod to move, thereby causing the jaws on the slider to move closer together and clamp the workpiece.

[0004] While this method of clamping workpieces can securely and easily, it cannot accurately locate the center point of the workpiece, which will affect the machining accuracy. Utility Model Content

[0005] The purpose of this invention is to overcome the existing defects and provide a two-jaw chuck that can accurately position the center point of the workpiece while clamping it, thus ensuring machining accuracy.

[0006] The technical solution to achieve the above objective is as follows: a two-jaw chuck, including a chuck base, on which two first support seats are mirror-connected, each first support seat is provided with a corresponding bearing, and the two bearings are rotatably connected to a rotating shaft, both ends of which are provided with first hexagonal grooves, and the rotating shaft is provided with a first external thread and a second external thread mirror-connected, the first external thread and the second external thread having opposite helical directions, and a second support seat is threadedly connected to each of the first external thread and the second external thread, and a slider is connected to the side wall of each second support seat, two sets of guide rails are connected to the chuck base, and a corresponding slider is slidably connected in each guide rail, and a clamping assembly for clamping parts is threadedly connected to each second support seat, and two locking assemblies for clamping the rotating shaft are also installed on the chuck base.

[0007] Preferably, the clamping assembly includes four support plates, two clamping clamps, and multiple first threaded rods. The upper surface of each second support base is mirror-image of the two support plates. Each support plate is tightly attached to the corresponding clamping clamp by multiple screws. The upper surface of each second support base is provided with multiple first threaded rods. The first threaded rods pass through the corresponding clamping clamps. Each first threaded rod is equipped with a corresponding fixing nut. The clamping clamps are provided with mounting grooves, and each fixing nut is located in the corresponding mounting groove.

[0008] Preferably, the locking assembly includes two chuck covers, a second threaded rod, an arc-shaped block, a connecting rod, two limiting plates, and a hollow sleeve. The chuck seat is threadedly connected to the two chuck covers by multiple screws. A limiting groove is formed in the middle part of the rotating shaft. Two arc-shaped blocks are closely attached to the limiting groove. Each arc-shaped block is connected to one end of the corresponding connecting rod. Two limiting plates are provided at the other end of the connecting rod. The hollow sleeve is slidably connected inside the connecting rod and is located between the two limiting plates. The hollow sleeve is connected to the second threaded rod. Each chuck cover has a sliding groove and a threaded groove. The connecting rod, the two limiting plates, and the hollow sleeve are slidably connected in the sliding groove. The second threaded rod is threadedly connected in the threaded groove.

[0009] Preferably, the opposing surfaces of the two arc-shaped blocks are connected with an anti-slip coating.

[0010] Preferably, each of the second threaded rods has a second hexagonal groove.

[0011] Preferably, the first hexagonal slot and the second hexagonal slot have the same volume.

[0012] The beneficial effects of this utility model are as follows: both ends of the rotating shaft are provided with a first hexagonal groove, and the rotating shaft is provided with a first external thread and a second external thread respectively. The helical directions of the first external thread and the second external thread are opposite. A second support seat is threadedly connected to the first external thread and the second external thread. A clamping pliers are threadedly connected to the second support seat. When the rotating shaft is rotated, the two clamping pliers will move synchronously relative to each other or away from each other. In this way, when the two clamping pliers clamp the workpiece, the midpoint of the rotating shaft is also the center point of the workpiece, ensuring the machining accuracy. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the interior of the chuck cover of this utility model; Figure 3 yes Figure 2 A partial sectional view; Figure 4This is a partial schematic diagram of the locking component of this utility model.

[0014] In the diagram: 1. Chuck seat; 2. First support seat; 4. Rotating shaft; 5. Guide rail; 6. Second support seat; 7. Slider; 8. First hexagonal slot; 9. Second hexagonal slot; 10. Support plate; 11. Clamping clamp; 12. First threaded rod; 13. Chuck cover; 14. Second threaded rod; 15. Arc block; 16. Connecting rod; 17. Limiting plate; 18. Hollow sleeve. Detailed Implementation

[0015] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] like Figure 1-4 As shown, a two-jaw chuck includes a chuck base 1, two first support seats 2, a rotating shaft 4, two second support seats 6, two sets of guide rails 5, a clamping assembly, and two locking assemblies.

[0018] Specifically, the chuck base 1 has two first support seats 2 mirror-connected, each first support seat 2 having a corresponding bearing. The two bearings are rotatably connected to a rotating shaft 4. Both ends of the rotating shaft 4 have a first hexagonal groove 8. The rotating shaft 4 has a first external thread and a second external thread mirror-connected, with opposite helical directions. A second support seat 6 is threadedly connected to both the first and second external threads. A slider 7 is connected to the side wall of each second support seat 6. The chuck base 1 has two sets of guide rails 5 connected, and a corresponding slider 7 is slidably connected in each guide rail 5. The second support seat 6 is threadedly connected to a clamping assembly for clamping parts. The chuck base 1 also has two locking assemblies for clamping the rotating shaft 4.

[0019] Specifically, the clamping assembly includes four support plates 10, two clamping clamps 11, and multiple first threaded rods 12. The upper surface of each second support base 6 is mirrored with two support plates 10. Each support plate 10 is tightly attached to the corresponding clamping clamp 11 by multiple screws. The upper surface of each second support base 6 is provided with multiple first threaded rods 12. The first threaded rods 12 pass through the corresponding clamping clamps 11. Each first threaded rod 12 is equipped with a corresponding fixing nut. Through the combined action of multiple first threaded rods 12 and multiple screws, the clamping clamps 11 and the corresponding second support base 6 can be fixed more tightly. The clamping clamps 11 are provided with mounting grooves, and each fixing nut is located in the corresponding mounting groove.

[0020] Specifically, the locking assembly includes two chuck covers 13, a second threaded rod 14, an arc-shaped block 15, a connecting rod 16, two limiting plates 17, and a hollow sleeve 18. The chuck seat 1 is threadedly connected to the two chuck covers 13 by multiple screws. A limiting groove is formed in the middle part of the rotating shaft 4, and two arc-shaped blocks 15 are closely attached to the limiting groove. Each arc-shaped block 15 is connected to one end of the corresponding connecting rod 16. Two limiting plates 17 are provided at the other end of the connecting rod 16. A hollow sleeve 18 is slidably connected inside the connecting rod 16, and the hollow sleeve 18 is located between the two limiting plates 17. The hollow sleeve 18 is connected to the second threaded rod 14. Each chuck cover 13 has a sliding groove and a threaded groove. The connecting rod 16, the two limiting plates 17, and the hollow sleeve are slidably connected in the sliding groove. 18. A second threaded rod 14 is threaded into the threaded groove. When the second threaded rod 14 is rotated, it drives the hollow sleeve 18 to rotate while moving linearly along the direction of the connecting rod 16. When the hollow sleeve 18 contacts the inner limiting plate 17, the second threaded rod 14 continues to rotate. At this time, the hollow sleeve 18 pushes the connecting rod 16 to move inward until the arc-shaped block 15 is in close contact with the limiting groove. In this way, the other arc-shaped block 15 can also be in close contact with the limiting groove, which can prevent the clamping clamp 11 from loosening. When it is necessary to loosen the two arc-shaped blocks 15, the second threaded rod 14 needs to be rotated in the opposite direction. At this time, the hollow sleeve 18 is no longer in close contact with the inner limiting plate 17, which makes it easier to rotate the shaft 4.

[0021] Specifically, the two arc-shaped blocks 15 are connected to the opposite surfaces with anti-slip coatings. The anti-slip coatings can increase the friction between the two arc-shaped blocks 15 and the rotating shaft 4, effectively preventing the rotating shaft 4 from rotating and better clamping the workpiece. Each second threaded rod 14 is provided with a second hexagonal groove 9. The first hexagonal groove 8 and the second hexagonal groove 9 are the same size, so that only one hexagonal wrench matching the first hexagonal groove 8 can be used, avoiding the need to change different hexagonal wrenches and making it convenient to clamp the workpiece.

[0022] Working principle: First, install the chuck seat 1 onto the output shaft of the machine tool. Then, insert a hex wrench into one of the first hexagonal slots 8 and rotate the hex wrench. The rotating shaft 4 will rotate. At this time, according to the principle of screw drive, the two second support seats 6 drive the two clamping clamps 11 to move relative to each other until the two clamping clamps 11 clamp the workpiece. Then, insert the hex wrench into the second hexagonal slot 9 and rotate the second threaded rod 14. According to the working principle of screw feed, under the action of the second threaded rod 14, the hollow sleeve 18 can push the connecting rod 16 and the arc block 15 to gradually approach the rotating shaft 4 until the arc block 15 is tightly attached to the limiting groove on the rotating shaft 4. Rotating the other second threaded rod 14 can completely fix the workpiece. When it is necessary to release the workpiece, the above steps need to be reversed.

[0023] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A two-jaw chuck, characterized in that, The chuck base (1) includes two first support seats (2) mirror-connected to the chuck base (1). Each first support seat (2) is provided with a corresponding bearing. The two bearings are rotatably connected to a rotating shaft (4). Both ends of the rotating shaft (4) are provided with a first hexagonal groove (8). The rotating shaft (4) is provided with a first external thread and a second external thread mirror-connected to the rotating shaft (4). The first external thread and the second external thread have opposite helical directions. A second support seat (6) is threadedly connected to the first external thread and the second external thread. A slider (7) is connected to the side wall of each second support seat (6). Two sets of guide rails (5) are connected to the chuck base (1). A corresponding slider (7) is slidably connected in each guide rail (5). A clamping assembly for clamping parts is threadedly connected to each second support seat (6). Two locking assemblies for clamping the rotating shaft (4) are also installed on the chuck base (1).

2. A two-jaw chuck according to claim 1, characterized in that, The clamping assembly includes four support plates (10), two clamping clamps (11), and multiple first threaded rods (12). The upper surface of each second support base (6) is mirrored with two of the support plates (10). Each support plate (10) is tightly attached to the corresponding clamping clamp (11) by multiple screws. The upper surface of each second support base (6) is provided with multiple first threaded rods (12). The first threaded rods (12) pass through the corresponding clamping clamps (11). Each first threaded rod (12) is equipped with a corresponding fixing nut. The clamping clamps (11) are provided with mounting grooves, and each fixing nut is located in the corresponding mounting groove.

3. A two-jaw chuck according to claim 1, characterized in that, The locking assembly includes two chuck covers (13), a second threaded rod (14), an arc-shaped block (15), a connecting rod (16), two limiting plates (17), and a hollow sleeve (18). The chuck seat (1) is threadedly connected to the two chuck covers (13) by multiple screws. A limiting groove is formed in the middle part of the rotating shaft (4), and two arc-shaped blocks (15) are tightly attached to the limiting groove. Each arc-shaped block (15) is connected to one end of the corresponding connecting rod (16), and the other end of the connecting rod (16) is provided with... There are two limiting plates (17), and the hollow sleeve (18) is slidably connected inside the connecting rod (16). The hollow sleeve (18) is located between the two limiting plates (17). The hollow sleeve (18) is connected to the second threaded rod (14). Each chuck cover (13) has a sliding groove and a threaded groove. The connecting rod (16), the two limiting plates (17) and the hollow sleeve (18) are slidably connected inside the sliding groove. The second threaded rod (14) is threadedly connected inside the threaded groove.

4. A two-jaw chuck according to claim 3, characterized in that, The two arc-shaped blocks (15) are connected to each other with an anti-slip coating.

5. A two-jaw chuck according to claim 3, characterized in that, Each of the second threaded rods (14) has a second hexagonal groove (9).

6. A two-jaw chuck according to claim 5, characterized in that, The first hexagonal slot (8) and the second hexagonal slot (9) have the same volume.

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