Self-centering driving tool

Abstract

The utility model belongs to the technical field of machining, and particularly relates to a self-centering driving tool which comprises a rotating disc fixed to a mechanical chuck, four supporting arms are fixed to the edge side of the left end face of the rotating disc in an equally-divided mode, and the left end faces of the four supporting arms are all connected with radial adjusting arms. The cross point of the axial leads of the four radial adjusting arms is positioned on the axial lead of the rotating disc; arc-shaped arms are hinged to the two sides of the ends, pointing to the axis of the rotating disc, of the four radial adjusting arms through pin shafts, arc convex bodies are fixedly arranged at the ends, close to the rotating disc, of the arc-shaped arms, self-deflection blocks are hinged to the ends, away from the rotating disc, of the arc-shaped arms through pin shafts, and adaptive clamping jaws are fixedly connected to the self-deflection blocks. Thrust is applied through the lathe tailstock rotating tip cone to enable the adaptive clamping jaw to clamp the transmission shaft blank, the clamping force of the adaptive clamping jaw to the transmission shaft blank is constant as long as the pressure applied by the lathe tailstock rotating tip cone is constant, stable clamping of the transmission shaft blank is guaranteed, and operation is easy, convenient and rapid.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a self-centering driving tooling. Background Technique

[0002] During the machining process of a transmission shaft, it is necessary to use a lathe to clamp both ends or one end of the transmission shaft, and then perform turning or milling on the middle part of the transmission shaft. Currently, usually, the three-jaw chuck of the lathe is used to clamp the head end of the cylindrical transmission shaft, and the tailstock center of the lathe is used to press against the tail end of the cylindrical transmission shaft. Patent CN108637288A proposes a self-centering driving tooling, including a base sleeve with an installation groove at one end and a through hole at the other end; an end face positioning block fixed on the base sleeve and located on the side where the through hole is located; a center, movably installed on the through hole; an elastic member installed in the installation groove and cooperating with the center to make the center tend to move away from the side of the installation groove. Through the elastic member, the center can axially float. The center first cooperates with the center hole of the workpiece, and the workpiece can be centered in the middle under the action of the center. Then the workpiece presses the center, and the center slides inward against the elastic force of the elastic member. Finally, the end face of the workpiece abuts against the end face of the end face positioning block. In this way, the center can assist the end face positioning block to achieve end face positioning, ensuring reliable accuracy when chamfering the gap of the workpiece, and the overall force on the workpiece is also better.

[0003] According to the analysis, this kind of self-centering driving tooling has the following deficiencies: First, this kind of self-centering driving tooling still needs to use tools such as a three-jaw chuck to clamp the workpiece each time, resulting in cumbersome operations and potential loosening during the clamping process of the equipment on the workpiece; Second, when disassembling the workpiece from the processing equipment, this kind of self-centering driving tooling still needs to reverse the clamping steps, resulting in cumbersome disassembly operations and low production efficiency. Content of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides a self-centering driving tooling, which solves the problems raised in the above background technique.

[0006] (2) Technical Solutions

[0007] The utility model specifically adopts the following technical solutions to achieve the above purpose:

[0008] A self-centering driving tooling, comprising a rotating disc fixed to a mechanical chuck. Four support arms are equally divided and fixed on the side of the left end face of the rotating disc. The left end faces of the four support arms are all connected with radial adjusting arms. The intersection point of the axis lines of the four radial adjusting arms is located on the axis line of the rotating disc. On both sides of one end of the four radial adjusting arms pointing to the axis line of the rotating disc, arc-shaped arms are hinged through pin shafts. At one end of the arc-shaped arms close to the rotating disc, arc-shaped convex bodies are fixedly provided. At one end of the arc-shaped arms far from the rotating disc, self-deflecting blocks are hinged through pin shafts. An adaptive jaw is fixedly connected to the self-deflecting block. A clamping handle is fixedly connected to the middle part of the right end face of the rotating disc. The clamping handle and the rotating disc are coaxial.

[0009] Further, first sawteeth are opened on the top surfaces of the four support arms, and second sawteeth are opened on the bottom surfaces of the four radial adjusting arms. The first sawteeth and the second sawteeth have the same specifications and are meshed with each other. Locking screws are screwed on the top surfaces of the four support arms. Waist-shaped slot holes are opened in the middle parts of the four radial adjusting arms. The locking screws penetrate through the waist-shaped slot holes, and the cap ends of the locking screws press against the top surfaces of the radial adjusting arms.

[0010] Further, a pull rod is fixedly provided between two adjacent arc-shaped arms. One end of the radial adjusting arm far from the axis line of the rotating disc is fixedly connected with a tension spring. The end part of the tension spring is fixedly connected with the pull rod.

[0011] Further, a roller is rotatably connected between two adjacent arc-shaped convex bodies. The roller is of a waist drum-shaped structure or a dumbbell-shaped structure.

[0012] Further, arc-shaped clamping surfaces are opened on one side of the four adaptive jaws close to each other, and axial teeth are evenly distributed on the arc-shaped clamping surfaces.

[0013] Further, milling flats are equally divided and opened on the outer cylindrical surface of the clamping handle.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the present utility model provides a self-centering driving tooling, which has the following beneficial effects:

[0016] In the present utility model, by applying a thrust through the rotating center cone of the lathe tailstock to make the adaptive jaws clamp the transmission shaft blank, as long as the pressure applied by the rotating center cone of the lathe tailstock is constant, the clamping force of the adaptive jaws on the transmission shaft blank is also constant, ensuring the stable clamping of the transmission shaft blank, and the operation is simple and fast;

[0017] For this utility model, when it is necessary to disassemble the transmission shaft blank between four adapter jaws, only the axial thrust of the rotary top cone of the lathe tailstock needs to be removed. Therefore, the operation of releasing the clamping of the transmission shaft blank is also simple and fast, thus improving the production efficiency of the processing of the transmission shaft blank. Brief Description of the Drawings

[0018] Figure 1 It is a front-side schematic diagram of the main structure of this utility model;

[0019] Figure 2 It is a partial structure schematic diagram of this utility model;

[0020] Figure 3 It is a schematic diagram of the state of this utility model when the transmission shaft blank is not clamped;

[0021] Figure 4 It is a schematic diagram of the state of this utility model when the transmission shaft blank is clamped.

[0022] In the figure: 1, rotary disc; 2, support arm; 21, first saw teeth; 22, locking screw; 3, radial adjustment arm; 31, second saw teeth; 32, waist-shaped slot; 4, arc-shaped arm; 41, pull rod; 5, arc convex body; 6, self-deflecting block; 7, adapter jaw; 71, arc-shaped clamping surface; 72, axial teeth; 8, clamping handle; 81, milled flat surface; 9, tension spring; 10, roller. Detailed Embodiment

[0023] Next, the technical solutions in the embodiments of this utility model will be clearly and completely described in conjunction with the drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this utility model.

[0024] Embodiment

[0025] Such as Figure 1 、 2As shown in , 3 and 4, a self-centering driving tooling proposed in an embodiment of the utility model comprises a rotating disc 1 fixed to a mechanical chuck, four supporting arms 2 are equally fixed on the left end surface side of the rotating disc 1, the left end surfaces of the four supporting arms 2 are connected with radial adjustment arms 3, and the intersection point of the axis lines of the four radial adjustment arms 3 is located on the axis line of the rotating disc 1; arc arms 4 are hingedly connected to both sides of one end of the axis line of the rotating disc 1 through pins, and arc convex bodies 5 are fixedly provided at one end of the arc arms 4 close to the rotating disc 1, and self-deflection blocks 6 are hingedly connected to the self-deflection blocks 6 through pins, and matching clamping claws 7 are fixedly connected to the self-deflection blocks 6, and a clamping handle 8 is fixedly connected to the central axis of the right end surface of the rotating disc 1, and the clamping handle 8 is coaxial with the rotating disc 1.

[0026] In this embodiment, the clamping handle 8 is fixedly clamped by the three-jaw chuck of the lathe, thereby also clamping and fixing the rotating disc 1. When clamping the cylindrical transmission shaft blank, the front end of the transmission shaft blank is passed through the four open adapter jaws 7 until the end of the transmission shaft blank simultaneously contacts the four arc convex bodies 5; a rotating top cone is installed on the tailstock of the lathe in advance, so that the rotating top cone is tightly pressed against the tail end of the transmission shaft blank, and the front end of the transmission shaft blank contacts the four arc convex bodies 5 with the pressing force of the rotating top cone. The four arc convex bodies 5 move away from each other under the action of thrust, causing the arc arm 4 to deflect. When deflecting, the arc arm 4 drives the self-deflection block 6 and the adapter jaw 7 to retract from the outside to the inside. At this time, the open adapter jaw 7 gathers under the action of pressure until the outer surface of the front end of the cylindrical transmission shaft blank is clamped;

[0027] Finally, the thrust from the rotating top cone of the lathe tailstock is balanced with the clamping force of the adapting jaws 7 on the cylindrical transmission shaft blank, and the cylindrical transmission shaft blank is clamped and fixed between the four adapting jaws 7. As long as the pressure applied by the rotating top cone of the lathe tailstock does not decrease, the clamping force of the adapting jaws 7 on the outer surface of the cylindrical transmission shaft blank will not decrease, thereby ensuring the stable clamping of the transmission shaft blank.

[0028] As described above, when the cylindrical transmission shaft blank needs to be disassembled from between the four adapter jaws 7, it is only necessary to remove the axial thrust of the rotating top cone of the lathe tailstock, so the operation of releasing the clamping of the transmission shaft blank is simple and quick.

[0029] Furthermore, the top surfaces of the four support arms 2 are each provided with a first serration 21, and the bottom surfaces of the four radial adjustment arms 3 are each provided with a second serration 31. The first serration 21 and the second serration 31 have the same specifications and are meshed with each other. The top surfaces of the four support arms 2 are each threadedly connected with a locking screw 22, and the middle part of the four radial adjustment arms 3 is each provided with a waist-shaped slot hole 32, and the locking screw 22 passes through the waist-shaped slot hole 32, and the cap end of the locking screw 22 is crimped against the top surface of the radial adjustment arm 3.

[0030] Therefore, the radial adjustment arm 3 can be displaced and adjusted on the top surface of the support arm 2 through the engagement of the second serrations 31 and the first serrations 21, so as to adjust the spacing of the four adaptor jaws 7, enabling them to grip cylindrical transmission shaft blanks with a large difference in diameter; after the radial adjustment arm 3 is adjusted to the appropriate position on the top surface of the support arm 2, the support arm 2 and the radial adjustment arm 3 can be firmly locked together by the locking screw 22.

[0031] Furthermore, a pull rod 41 is fixedly arranged between two adjacent arc-shaped arms 4, and one end of the radial adjustment arm 3 far from the central axis of the rotary disk 1 is fixedly connected with a tension spring 9, and the end of the tension spring 9 is fixedly connected with the pull rod 41.

[0032] As described above, the function of the tension spring 9 is to pull the arc-shaped arms 4 through the pull rod 41 under normal conditions, so that the four adaptor jaws 7 are separated from each other, facilitating the first end of the transmission shaft blank to pass through between the four adaptor jaws 7 until the first end of the cylindrical transmission shaft blank presses against the arc-shaped convex body 5, and then the axial thrust overcomes the tension of the four tension springs 9 to make the four adaptor jaws 7 grip the first end of the transmission shaft blank.

[0033] Furthermore, a roller 10 is rotatably connected between two adjacent arc-shaped convex bodies 5, and the roller 10 is of a waist drum shape or a dumbbell shape.

[0034] Among them, the roller 10 can better conduct the pressing force at the first end of the cylindrical transmission shaft blank to the arc-shaped arms 4, and then to the self-deflecting block 6 and the adaptor jaws 7 to grip the first end of the cylindrical transmission shaft blank.

[0035] Furthermore, arc-shaped clamping surfaces 71 are provided on the sides of the four adaptor jaws 7 close to each other, and axial teeth 72 are evenly distributed on the arc-shaped clamping surfaces 71. The axial teeth 72 can well bite the outer wall of the first end of the cylindrical transmission shaft blank to ensure that the cylindrical transmission shaft blank does not slip during processing.

[0036] Furthermore, milling flats 81 are equally spaced on the outer cylindrical surface of the clamping handle 8, and the milling flats 81 facilitate the three-jaw chuck to firmly grip the clamping handle 8 and the rotary disk 1.

[0037] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A self-centering driving tooling, comprising a rotating disc (1) fixed to a mechanical chuck, characterized in that: Four support arms (2) are equally divided and fixed on the side of the left end face of the rotating disc (1). The left end faces of the four support arms (2) are all connected with radial adjusting arms (3). The intersection point of the axis lines of the four radial adjusting arms (3) is located on the axis line of the rotating disc (1). On both sides of one end of the four radial adjusting arms (3) pointing to the axis line of the rotating disc (1), arc-shaped arms (4) are hinged through pin shafts. At one end of the arc-shaped arms (4) close to the rotating disc (1), arc-shaped convex bodies (5) are fixedly arranged. At one end of the arc-shaped arms (4) far from the rotating disc (1), self-deflecting blocks (6) are hinged through pin shafts. An adaptive jaw (7) is fixedly connected to the self-deflecting block (6). A clamping handle (8) is fixedly connected to the middle part of the right end face of the rotating disc (1). The clamping handle (8) and the rotating disc (1) are coaxial.

2. The self-centering driving tooling according to claim 1, characterized in that: First sawteeth (21) are arranged on the top surfaces of the four support arms (2). Second sawteeth (31) are arranged on the bottom surfaces of the four radial adjusting arms (3). The first sawteeth (21) and the second sawteeth (31) have the same specifications and are meshed with each other. Locking screws (22) are screwed on the top surfaces of the four support arms (2). Waist-shaped slot holes (32) are arranged in the middle parts of the four radial adjusting arms (3). The locking screws (22) penetrate through the waist-shaped slot holes (32). The cap ends of the locking screws (22) press against the top surfaces of the radial adjusting arms (3).

3. The self-centering driving tooling according to claim 1, characterized in that: A pull rod (41) is fixedly arranged between two adjacent arc-shaped arms (4). One end of the radial adjusting arm (3) far from the central axis of the rotating disc (1) is fixedly connected with a tension spring (9). The end of the tension spring (9) is fixedly connected with the pull rod (41).

4. The self-centering driving tooling according to claim 1, wherein: A roller (10) is rotatably connected between two adjacent arc-shaped convex bodies (5). The roller (10) is of a waist-drum-shaped structure or a dumbbell-shaped structure.

5. The self-centering driving tooling according to claim 1, characterized in that: Arc-shaped clamping surfaces (71) are arranged on the sides of the four adaptive jaws (7) close to each other. Axial teeth (72) are evenly arranged on the arc-shaped clamping surfaces (71).

6. The self-centering driving tooling according to claim 1, characterized in that: Milled flat surfaces (81) are equally divided and arranged on the outer cylindrical surface of the clamping handle (8).

Images