Claw type tap chuck

Abstract

The utility model provides a claw type tap chuck, and belongs to the technical field of tap chucks. The claw type tap chuck comprises a chuck sleeve, a chuck claw, a chuck base and a screw rod, the screw rod penetrates through the chuck base from back to front, and the top end of the screw rod is fixedly connected with a chuck chassis; four chuck claws of the same structure are arranged on the front side of the chuck base plate in the circumferential direction, clamping faces are formed on the sides, facing the center, of the chuck claws, connecting springs are arranged between the adjacent chuck claws, the chuck claws and the connecting springs are connected at intervals to form claw-shaped structures connected end to end, and the center of each claw-shaped structure is a screw tap clamping space. The chuck sleeve is arranged on the outer side of the chuck jaw from front to back in a sleeving mode and connected with the chuck base. The screw tap clamping device has the advantages of being simple in structure, easy to operate, capable of clamping screw taps of different specifications in an adjustable mode, firm in clamping and not prone to slipping.

Description

Technical Field

[0001] The utility model belongs to the technical field of tap chucks, and particularly relates to a claw-type tap chuck. Background Art

[0002] A tap chuck is a kind of fixture tool series installed on an internal thread processing machine tool for clamping a tap. Generally, it refers to a chuck that clamps the tap by the elastic deformation of a front-end square hole and a sliding sleeve steel ring.

[0003] According to a tap chuck disclosed in the invention patent with the application number CN202211177179.9, it has a main body with a chuck sleeve hole opening at the front end side, a tap chuck sleeve with a tap installation hole arranged at the front end part and a sleeve hole arranged at the base end side, a torque transmission mechanism for transmitting the rotation of the main body to the tap chuck sleeve, a first elastic body for pressing the tap chuck sleeve in the front end direction, a sleeve for preventing the tap chuck sleeve from falling off in the front end direction, and a second elastic body for pressing the tap chuck sleeve in the base end direction. The problems existing in this patent are: there are many structural components, the opened installation holes are cylindrical with fixed specifications and are not adjustable, and when the tap is inserted into them for tapping, it is easy to slip and rotate inside, affecting the tapping quality. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a claw-type tap chuck with a simple structure, adjustable and firm tap clamping for the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A claw-type tap chuck includes a chuck sleeve, chuck claws, a chuck base and a screw rod;

[0006] An adjusting helix is provided at the front end of the screw rod, and the rear end is a machine head mounting handle. A base center hole is formed in the center of the chuck base, and a base center thread is formed on the inner side wall of the base center hole. The screw rod passes through the base center hole from back to front, and the adjusting helix on it cooperates with the base center thread to realize the forward and backward movement of the screw rod;

[0007] A chuck chassis is fixedly connected to the top of the screw rod. Four chuck claws with the same structure are circumferentially arranged on the front side of the chuck chassis. A clamping surface is formed on the side of the chuck claw facing the center. Spring holes are formed on both side surfaces of the chuck claw facing the adjacent chuck claws, and connecting springs are installed in the spring holes. The chuck claws and the connecting springs are connected at intervals to form a claw-type structure connected end to end;

[0008] A base external thread is formed on the outer side wall of the chuck base. The chuck sleeve is sleeved on the outside of the chuck claws from front to back, and an inner thread matched with the base external thread is formed on the inner side wall of its rear end.

[0009] In the above-mentioned claw-type tap chuck, an outer friction pattern is provided on the outer side wall of the chuck sleeve so that the user can install the chuck sleeve on the chuck base.

[0010] In the above-mentioned claw-type tap chuck, a chuck friction pattern is provided on the clamping surface of the chuck claw so as to better clamp the tap through the clamping surface.

[0011] In the above-mentioned claw-type tap chuck, a material-reducing groove is provided on the outer side wall of the chuck base at the rear side of the external thread on the base.

[0012] Compared with the prior art, in a claw-type tap chuck provided by the present utility model, after the required tap is inserted between the chuck claws, the position of the chuck claws is adjusted by screwing the screw rod with the machine head, so that the square head at the tail end of the tap is firmly clamped under the extrusion of the inner wall of the chuck sleeve, making the tap not easy to slip during tapping, improving the tapping quality of the internal thread processing machine tool, and having a simple structure and convenient operation. It can adjust the size of different clamping spaces according to taps of different specifications and sizes, and has strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present claw-type tap chuck;

[0014] Figure 2 is a schematic internal structure diagram of the present claw-type tap chuck;

[0015] Figure 3 is a structural cross-sectional view of the present claw-type tap chuck.

[0016] In the above figures, 100, chuck sleeve; 110, outer friction pattern on the sleeve; 120, internal thread in the sleeve; 200, chuck claw; 211, spring hole; 212, clamping surface; 213, chuck friction pattern; 220, connecting spring; 230, chuck chassis; 300, chuck base; 310, external thread on the base; 320, groove; 330, central hole in the base; 331, central thread in the base; 400, screw rod; 410, adjusting screw; 420, machine head mounting handle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following are specific embodiments of the present utility model and in combination with the accompanying drawings, the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0018] As Figures 1 to 3As shown in the figure, this claw-type tap chuck includes a chuck sleeve 100, chuck claws 200, a chuck base 300, and a screw rod 400. The screw rod 400 passes through the chuck base 300 from the rear to the front and is fixedly connected to a chuck chassis 230 at the top. Four chuck claws 200 with the same structure are circumferentially arranged on the front side of the chuck chassis 230 and are connected end to end through connecting springs 220. The chuck sleeve 100 is sleeved on the outside of the chuck claws 200 from the front to the rear and is connected to the chuck base 300.

[0019] As Figures 2 to 3 shown, the rear end of the screw rod 400 is a machine head mounting handle 420 for mounting on the fixture machine head of an internal thread processing machine. The front end is provided with an adjusting screw 410. A base center hole 330 is opened in the center of the chuck base 300, and a base center thread 331 is formed on the inner side wall of the base center hole 330. The adjusting screw 410 cooperates with the base center thread 331, so that the screw rod 400 can be adjusted to move back and forth in the base center hole 330 by rotation, thereby driving the chuck chassis 230 and the chuck claws 200 on its front side to perform front and rear position adjustments, realizing the adjustable change of the tap clamping port.

[0020] As Figure 2 shown, the four chuck claws 200 have the same structure and together form a flat-top cone with a base. The chuck claws 200 form a clamping surface 212 on the side facing the center. The four clamping surfaces 212 respectively correspond to the four planes of the square head at the end of the tap. Clamping friction lines 213 are opened on the clamping surfaces 212 of the chuck claws 200 to increase the roughness of the contact surface, so as to better clamp the tap through the clamping surface 212 and prevent the tap from slipping during the tapping process and affecting the tapping quality.

[0021] Spring holes 211 are opened on both side surfaces of the chuck claws 200 facing the adjacent chuck claws 200. The axial direction of the spring holes 211 is perpendicular to the side surface where they are located, and the two spring holes 211 on the same chuck claw 200 do not intersect. The same connecting spring 220 is installed between the two chuck claws 200 where the adjacent spring holes 211 are located. The connecting spring 220 is an outward-supporting spring, so that the four chuck claws 200 and the four connecting springs 220 are connected to each other at intervals to form a claw-type structure connected end to end. The center of the claw-type structure is the clamping space at the end of the tap.

[0022] As Figures 2 to 3As shown, an external base thread 310 is formed on the outer side wall of the chuck base 300. A material-reducing groove 320 is formed on the outer side wall of the chuck base 300 at the rear side of the external base thread 310, which gives the rear end a deformation space when the front end of the chuck sleeve 100 is clamped while saving materials. The chuck sleeve 100 is integrally in the shape of a hollow thin-shell bullet. An internal sleeve thread 120 is formed on the inner side wall of its rear end. The internal sleeve thread 120 cooperates with the external base thread 310 to fix the chuck sleeve 100 to the front end of the chuck base 300. External sleeve friction lines 110 are formed on the outer side wall of the chuck sleeve 100, which facilitates the user to install the chuck sleeve 100 on the chuck base 300 by rotation.

[0023] The working principle of the present utility model is as follows: This claw-type tap chuck is installed on the fixture head of an internal thread processing machine tool through the chuck mounting handle of the screw rod 400. The front and rear positions of the screw rod 400 are intelligently adjusted by the machine head. When installing the required tap, the square head at the tail end of the tap is inserted into the clamping space at the center of the claw-type structure formed by the chuck claws 200 from front to back. Then, the screw rod 400 drives the chuck base plate 230 and the chuck claws 200 to move forward. Under the inward extrusion of the gradually shrinking inner wall of the chuck sleeve 100, the clamping space of the chuck claws 200 gradually shrinks until the clamping surface 212 of the chuck claws 200 abuts against the plane of the square head at the tail end of the tap, realizing firm clamping of the tap and then tapping.

[0024] When it is necessary to replace taps of different specifications, the screw rod 400 is moved backward. The chuck claws 200 are automatically loosened from the tail end of the tap under the reset action of the connecting spring 220. After the user removes the tap, the above installation operation can be repeated.

[0025] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

[0026] Although various terms are used more frequently herein, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A claw-type tap chuck, characterized in that, It includes a chuck sleeve (100), chuck jaws (200), a chuck base (300) and a screw rod (400); an adjusting screw (410) is provided at the front end of the screw rod (400), and the rear end is a machine head mounting handle (420). A base center hole (330) is provided at the center of the chuck base (300), and a base center thread (331) is formed on the inner side wall of the base center hole (330). The screw rod (400) passes through the base center hole (330) from the rear to the front, and the adjusting screw (410) thereon cooperates with the base center thread (331) to realize the forward and backward movement of the screw rod (400). A chuck chassis (230) is fixedly connected to the top of the screw rod (400). Four chuck jaws (200) with the same structure are circumferentially arranged on the front side of the chuck chassis (230). A clamping surface (212) is formed on the side of the chuck jaw (200) facing the center. Spring holes (211) are provided on both side surfaces of the chuck jaw (200) facing the adjacent chuck jaws (200). Connecting springs (220) are installed in the spring holes (211). The chuck jaws (200) and the connecting springs (220) are connected at intervals to form a claw-shaped structure connected end to end. A base external thread (310) is formed on the outer side wall of the chuck base (300). The chuck sleeve (100) is sleeved on the outside of the chuck jaws (200) from the front to the rear, and an internal thread (120) matching the base external thread (310) is formed on the inner side wall of its rear end.

2. The claw-type tap chuck according to claim 1, wherein, Outer friction lines (110) are provided on the outer side wall of the chuck sleeve (100) so that the user can install the chuck sleeve (100) on the chuck base (300).

3. The claw-type tap chuck according to claim 1, characterized in that, Chuck friction lines (213) are provided on the clamping surface (212) of the chuck jaw (200) to better clamp the tap through the clamping surface (212).

4. A claw-type tap chuck according to claim 1, characterized in that, A material reduction groove (320) is provided on the outer side wall of the chuck base (300) behind the base external thread (310).

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