Clamping system

Abstract

A clamping device for clamping a tool includes a tool holder with a collet and a clamping nut in and the tool holder has a mechanism for clamping the tool holder and for detecting and displaying a torque applied to the clamping nut.

Claims

1. A clamping device for clamping a tool using a covet and clamping nut into a tool holder comprises: a clamping ring for clamping the too holder, a lever which is rigidly connected to the clamping ring, a pressure cell, against which the lever lies and to which a force is transmitted via a torque exerted on the clamping nut, and a display device connected to the pressure cell and calibrated according to an exerted torque, whereby clamping does not require a torque wrench.

2. The clamping device according to claim 1, wherein the clamping ring has a quick-release mechanism.

Description

(1) Below an exemplary embodiment of the invention is described with reference to the attached drawings. Wherein:

(2) FIG. 1 shows a perspective representation of a clamping device;

(3) FIG. 2 shows a cross-sectional representation of the device shown in FIG. 1.

(4) The device shown in FIG. 1 in perspective and in FIG. 2 in cross-section serves for clamping a tool 1 by means of a clamping nut 2 and a collet (not shown) in a tool holder 3. FIG. 1 shows the device without housing for the sake of clarity.

(5) A clamping ring 4 has a diameter corresponding to the outside diameter of the tool holder flange and is provided with a quick-release mechanism 5 for quick clamping and release of the tool holder. The clamping ring 4 is rigidly connected by a cylindrical sleeve 6 to a lever 7. The end of the lever lies against a pressure cell 8 which is hydraulically connected to a display device 9. The display device is accordingly calibrated to the torque applied to the clamping nut. The functional parts of the device are arranged in the housing 10, which is connected to a base plate 11.

(6) Using the device according to the invention, the tightening of the clamping nut can be carried out with any optional tool. A torque wrench is not required. For a tool holder clamped into the clamping ring by means of a quick-release mechanism, when a torque is applied to the clamping nut, this acts via the clamping ring 4 and the sleeve 6 directly on the lever 7, which then presses, on the pressure cell with a force corresponding to the torque. The pressure thereby arising in the pressure cell is hydraulically transmitted to the display device and displayed as torque. Instead of the pressure cell, some other pressure measurement unit can also be used, for example a piezoelectric sensor.

(7) The clamping ring is interchangeable for adjustment of the device to different flange diameters of the tool holder.