JPH0280936A - Clamping device for material testing machine - Google Patents

Abstract

PURPOSE: To easily manufacture a clamping device for material testing machine and, at the same time, to avoid a notching effect by forming the guiding surface of a clamping housing and the contact surfaces of clamping jaws into cylindrical shapes. CONSTITUTION: As a guiding substrate 10 is pushed to move, clamping jaws 7 and 7' which have cylindrical contact surfaces 9 and 9' and into which a test piece 8 is inserted move relatively to a clamping housing 1 which is provided with an opening 11, etc., and has cylindrical guiding surfaces 5 and 5'. As a result, the test piece 8 is clamped by wedging forces generated when the surfaces 9 and 9' come into contact with the surfaces 5 and 5'. Since the contacting surfaces 9 and 9' and guiding surfaces 5 and 5' have cylindrical shapes and no planar wedge is used, a clamping device for material testing machine can be manufactured easily and, at the same time, the notching effect caused by the indentations on the side face of the planar wedge can be avoided.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides two wedge-shaped clamps guided in a clamp j-1 housing and a clamp f'1 housing and having opposing clamp iJ surfaces. consists of jaws, the housing is formed into a wedge shape, the clamp has a guide surface with which the jaws come into contact, and the clamp jaw or clamp is formed when the housing moves in the axial direction. However, the tightening is related to the tightening device of the material testing machine, which is tightened between Schiller or the tightening surface.

[Conventional technology]

Wedge-shaped fastening elements are often used to fasten or connect structural parts. In the case of wedge-shaped fasteners for testing machines, conventionally the tightening is done with a housing and a locking key with a flat wedge surface.

The clamp housing is usually designed as an annular open housing, ie the test specimen is inserted into the clamp from, for example, 41J.

The production of a wedge surface on the housing requires considerable expense for tightening. The right-angled serrations on the sides of the wedge face prevent undesirable notches under load.
Since the fruit is produced, it is necessary to use the method of tightening ("i + f / % welding is correspondingly large 1").

In the case of a drill drill for a drilling machine (see USSR Pat. No. 2,808,253), three clamping elements are used, which are arranged at equal angular intervals from each other over the circumference of the drill chuck, in order to clamp the tool. has been done. During their tightening, the elements are guided by a cylindrical segment of the drill chuck. However, this structure cannot be used in a material testing machine.

[Problem to be solved by the invention]

It is an object of the present invention to provide a device for tightening test specimens in a materials testing machine, which is easy to manufacture and avoids notch effects in the housing. It is in.

[Failure to solve the problem]

According to the invention, this object is achieved in that the guide surface on the clamping housing and the contact surface of the clamping sealer are of cylindrical design.

Advantageous embodiments of the invention are embodied in the claims! It is described in the 3rd section.

〔Effect of the invention〕

The guide surface of the housing is formed in a cylindrical shape, and the tightening is done in accordance with the cylindrical guide surface. The device prevents clamping such that the contact surface of the sealer can be simply and easily produced by a drilling machine or a lathe.Notch effects at the lateral transition of the cylindrical guide surface in the clamping housing are avoided.

According to the invention, the guide surfaces in the clamping housing and the contact surfaces of the clamping jaws are designed in such a way that they extend over an angle of up to 80°. This results in a simple shape for the housing and the sealer.

〔Example〕

The present invention will be described in detail below with reference to embodiments shown in the drawings.

In Fig. 1, there are two holes 2, 2 in the housing 1 for tightening.
' is left open. These holes 2.2' or their centers 613.3' are at an angle to the center line 4 of the housing 1. The angle is obtuse and this tightening represents the wedge angle of the device.

The wedge clamping by the holes 2, 2 is such that the material 6 of the housing 1 present between the two holes 2, 2', in which the cylindrical guide surface 5.5 resides, is Even the lines have been removed. As a result, the clamp accommodates in the housing l a through opening with a wedge-shaped cylindrical contact surface or guide surface for receiving the sealer. For tightening, the housing 1 is formed into an annular or oval shape (see FIG. 3).

FIG. 2 shows a housing 1 with a wedge-shaped guide surface 5.5. ! 17.7' and specimen 8. In this case, test piece 8 should be tightened! 17.
The clamp 7' is clamped to the surface 9.9'. The clamping surface 9.9' is of flat design or has another suitable shape for receiving the test specimen 8.

Tighten it! 17.7 has cylindrically designed contact surfaces (center line 3.3'), which contact the cylindrical guide surface 5.5' of the housing l and cooperate with this. do.

The center line 3.3' coincides with the hole center line 3,3' in FIG. The clamps 5-77 and the clamp housing 1 are movable relative to each other in the axial direction (in the direction of the center line 4) on the wedge-shaped guide surfaces. Further tightening is Schiller 7
．． A substrate 10 is provided for guiding 7'. Tighten it on this board 10! ! 1.1' The clamps are arranged movably in the direction, ie inwardly or outwardly or relative to each other. The clamping surfaces 9.9' are clamped in such a way that they intersect the center line 33' of the cylindrical contact surface approximately in their central region. ! 7.7'.

The clamping surfaces 9, 9' of the jaws a1.1' are perpendicular to the substrate IO. For example, when test J48 is tightened eccentrically, the center line of the cylindrical guide surfaces 5, 5' is 3.3'
The rotation of the screw g 1.1' about the center of tightening (=j) on the substrate 10 is prevented by the guide of the screw y7.7'.

In the case of this clamping device, either the base plate 10 or the clamping housing l is firmly connected to a testing machine (not shown).

In order to actuate the device, the respective movable structural part, ie the housing 1 or the base plate 10, is urged in the direction of the center line 4 by means of a loading device, for example a hydraulic loading cylinder. In the tightening process, tightening is done by G s1.
1' is moved inwardly over the substrate 10 by the wedge action of the guide surface 5.5', and the specimen 8 is then clamped in a known manner.

In order to loosen the test piece 8, the substrate 10 or the clamp housing 1 is moved in the opposite direction, in which case the clamp is j! 17
．． 7' is guided outwards, freeing the specimen 8. For example, the tightening is done by J51.The return movement of 7.7' is
7.7' and the tightening is effected by a spring or guide element arranged between it and the housing l.

Figure 3 shows the arrangement structure of the housing l for tightening, the shielder 7.7' and the test piece 8 for tightening the board 101 (A-A cross section in Figure 2), and the housing l for tightening. It is open in the shape and makes Lll during insertion. The test piece 8 is inserted into the device through this insertion opening If, for example, from the front, or the test piece 8 is tightened in the same direction. 17.7' (7) is inserted between. Figure 3 further shows that the tightening is ji! The guide element 12 for returning 17.7' is shown in the released position.

It can be seen from FIG. 3 that the clamping is such that the contact surface of the jet t1.1' is in contact with the guide surface 5.5' over an angle of up to 180°. Tighten the wedge! In the upper range of 17.7 this angle is less than 180° (see figure 2), the tightening is ji! ! -77, the lower part on the substrate 10 side can be tightened into a shape that fits the opening of the housing 1, unlike in FIG. Tighten the board 10゛ (refer to the - dotted chain line)! ! 17.7' shape or tightening is housing 1
It is adapted to the opening in the

Tighten on the guide surface of housing 1 and tighten on screws 7 and 7.
The contact surface of ' is formed into a perfect cylindrical shape or a partially perfect cylindrical shape if the clamping is G+7.7' and the housing 1 is formed accordingly.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the housing; Figure 2 is a vertical cross-section of the housing; Figure 2 is a vertical cross-section of the housing; It is a diagram. 1 Tightening is housing 2.2 hole 5.5' guide surface 7.7 Tightening is Schiller 9.9' Tightening is surface 10 Board departure person sanjin Sato 2'3' F-/g

Claims (1)

[Claims] 1. Consisting of a clamping housing and two wedge-shaped clamping jaws guided within the clamping housing and having opposing clamping surfaces, the clamping housing being formed in a wedge shape and a guide surface with which the clamping jaws come into contact. In a clamping device of a material testing machine in which the specimen is clamped between the clamping jaws or the clamping surface when the clamping jaw or clamping housing moves in the axial direction, the guide surface in the clamping housing (1) (5, 5')
and a tightening device for a material testing machine, characterized in that the contact surfaces of the tightening jaws (7, 7') are formed in a cylindrical shape. 2. Clamping jaws (7, 7') are arranged on the base plate (10) and are guided on this base plate (10) in the radial direction or in the clamping direction, and can be moved through the base plate (10) or the clamping housing (1). Claim 1 characterized in that it is operated by
Tightening device as described. 3. Guide surface (5, 5') in tightening housing (1)
) and the contact surfaces of the tightening jaws (7, 7') are 180
3. A tightening device according to claim 1, characterized in that it extends over an angle of up to . 4. Guide surface (5, 5') in tightening housing (1)
4. Tightening device according to claim 1, characterized in that the center lines (3, 3') of the curves (3, 3') form an obtuse angle with respect to each other. 5. A claim characterized in that the center line (3, 3') of the cylindrical contact surface of the clamping jaw (7, 7') intersects the clamping surface (9, 9') approximately in its central range. Items 1 to 4
The tightening device according to any one of.