DE2209930C3 - Testing device for testing the hardness of flexible materials - Google Patents

Description

3 4

Test objects with different transverse dimensions whose end of the support arm 6, coaxial to the spindle, cannot easily be compared with one another 10, a vertical bore 13 is attached, which can be at the top. But there are those achieved according to the invention and surrounded at the bottom by collar approaches 14 and 15. Measurement results are much more even than those in this hole is a height-adjustable collar measurement results that were obtained with conventional Prüfvorrich- 5 socket 16, the overhead collar 17 of which was achieved with test objects whose transverse representation rests on the collar attachment 14 and one measurements were smaller than the contact surface. has rearwardly pointing nose 18. On the

In addition, there is no longer a need here, the lower end of the flange bushing 16 is a ring nut that the tip or the end of a feeler element 19 is screwed on, which has the defined distance from a reference surface from the collar attachment 15 stood the adjustment path η , which normally has to. The tactile organ can therefore be 2.54 mm freely in almost any way.

protrude. An adjusting bolt 20 is attached to the collar bushing 16 without further ado.

differently designed interchangeably provided, the bottom a receptacle 21 for a measuring device

so that one carries with the same measuring device according to guess 22. The parts 20 and 22 can be fixed to the

simple conversion different types of measurements 15 flange socket 16 be connected. But you can

can make. also in the conventional way against a

Another advantage of the invention is that the given load can be moved upwards. Daman after the elimination of a certain contact surface at, however, this load does not have to be as at herauch no longer consistent with a weight load and conventional Shore testing devices and besides the act on the organ of touch - ao formed by a weight, since it only acts on one The spring no longer needs a load medium, security arrives, which also take over a spring only devices for change can anyone. As a rule, such a fuse is the same Ways. The device can therefore be lighter and yet unnecessary, so that of a permanent connection be designed to be more manageable. It is true that the measuring device with the flange socket 16 is currently assumed can still be based on the conventional device.

lines assumed that the sensing element is designed as a perpendicular to the axis of the bore 13 in the support-displaceable punch. A bearing bushing 23 can, however, be attached to arm 6, in which it can also be pivotably arranged, since with an adjusting disk with a correspondingly large lever arm, the penetration direction 24 is mounted in a rotatable manner by means of a pin 24 a. Axially parallel to the axis of the pin with the normally only a few millimeters thick 30 24 a, the eccentricity e of an Ex test object does not change noticeably. In the case of the pre-centered pin 23 attached, which is in a horizontally flat thickness of the test specimens, this anyway has no segment or tangential groove 26 of the collar definition. The entire device can therefore protrude from the base socket 16. In the operating position according to additionally designed as a pliers-like hand element F i g. 2, ie the lower engagement position, has to be carried out without the measuring accuracy underneath. the socket 16 with the measuring device on the upper one

Both adjustment devices can, in principle, shoulder 14 rests. However, if you turn the ex

be connected in series and on the same center by the adjusting disk 25 ru: ch above, so

Act on the component, for example the measuring device. comes the ring nut 19 on the shoulder 15 to

For reasons of simpler manufacture, the larger system, shortly before the eccentric reaches its upper dead center

ßer accuracy and better operation development achieved, at least in an angular range in

because of it, however, it is advisable to use the joint self-locking against the weight forces of the

men device frame the first adjustment device collar bushing 16 and the measuring device is achieved,

This is the normal operating position out of use

switch. 45 and can also be

Further features embodying the invention will keep.

are characterized in the subclaims. The measuring device 22 has in the form of a dial gauge

In accordance with the invention, a scale which is calibrated from 1 to 100 according to Shore is based on the following description

an exemplary embodiment explained. It shows and has a freely protruding far downwards

1 shows a front view of a punch 27 according to the invention, which is easily threaded by means of thread engagement

trained test device and replaceable a stylus 28 carries its free

Fi g. 2 a partial section through this device EnJe according to the regulations for Shore measurement

according to the line II-II in Fig. 1 is formed. The stamp 27 is through

In the drawing, 1 generally denotes a device, a spring not shown, is pressed downward. Abbot frame called. 1 is a control panel with 55 deviating from the other measuring devices for Shore is control and display elements S, 4. From the switching the range of motion of the pointer 29 but not the desk protrudes back ^; tig a cylindrical column 5 limited by the 0 mark, but goes back to a top, at the free end of a support arm6 (Fig. 2) starting mark M , in which a lever 7 is essentially clamped. lower preload of, for example, 2 p or even

At the top of the control panel 2 is a courage 60 a preload 0 prevails. If you are now at the top 8 rotatably mounted with knurled flange 9 and henclem eccentric gear rotates the knurled flange 9, If a self-locking thread takes a, the sample 12 is lifted in the direction of the support 11. Spindle 10, which in the known, not shown Man, adjusts until the pointer 29 reaches the mark 0 Way is secured against rotation and has reached at her. Then namely acts on the organ of touch free end as support 11 carries a support table, 65 which is also used in other Shore measuring devices in this case on which a test object 12 in the form of a disk, a mark, existing preload of, for example, 56 p. Strips or the like. If you then the Stellscheibc 24 so far

As can be seen from everything in Fig. 2, is! on pre-rotates until the collar 17 on the collar approach 14, like

in Fig. 2, comes to the plant, the measuring device is by the adjustment path α, preferably 2.54 mm, moved down. The tactile element 28 is so much more against the force of its spring pushed back, the greater the hardness. This relative adjustment with respect to the measuring device is indicated by the pointer 29 on the scale in Shore values.

To measure thin test objects, the adjustment path α can be reduced to 0.5 mm, for example. The tactile element 28 can be exchanged for a different one, the arrangement and training the adjusting gear, the feeler element and de; Change the measuring device in various ways, provided that it is only ensured that one of the two Verstellun conditions takes place at a fixed path α.

1 sheet of drawings

Claims (7)

The underside is a surface that is the size of Claims: should have 1 cm ² A punch protrudes vertically from this contact surface, the free end of which has the shape X, test device for testing the hardness of a soft truncated cone (Shore A and C) or an elastic material such as rubber or plastic 5 rounded cone (Shore P) . The protrusion "toff" with a hardness measuring device, which is a compared to the contact surface 2.54 mm according to DIN the force of a measuring spring by a constant max Force of 1 kg or 5 k <»belatinen has a displaceable stamp, with one point. You usually lift the support for the test specimen by means of a lever. _c an, jyubei - due to the size of the attachment device and with an adjustment device for: the surface area and the aforementioned load - a certain amount of the distance between the support and the preload is effected, which does not go into the measurement of a measuring device, marked by At Tastwert0, however, the feeler element is already loaded with a certain force in the gear train between support 15, for example (11) and measuring device (22) e activated adjustment 56 p. device (24 to 26), the adjustment path (a) of which in the known devices it is possible constants maximum penetration depth of the Tastor- borrowed to hold the measuring device separately by hand and gans adapted ssL to be placed directly on the test item. Exact measurement 2. The device according to claim 1 with an ao gene are relatively difficult to use. its scale value 0 only when it is presented, since the load is not manually applied last is achieved, characterized in that can easily hold constant. Essential However, the range of deflection of the pointer to below the changes in the measured value results Scale value 0 extends down (Λί). even in the case of a device, if the test objects 3. Device according to spoke 1 or 2, that not in the necessary size of the contact surface characterized in that at the common of 1 cm * are available, for example the shape The device frame (1) has the first adjustment device of a band a few millimeters wide, device (8 to 10) of the support (11) and the second The constant load is then applied to the (24 to 26) doui measuring device (22) is connected upstream. distributed over a smaller area, so that a corresponding 4. Apparatus according to claim 1, 2 or 3, since there is greater preload of the tactile organ,
characterized in that the adjustment path (α) The invention is based on the object of designing one of the stops (18, which can be adjusted to one another in such a way that it is largely independent of which is limited and the adjustable part (16) of the removable surface of the test object at least approximately at least positively and automatically in its end position delivers constant measurement results. is held. According to the invention, a second, 5. Apparatus according to claim 4, characterized in the oil transmission between support: jnd measuring device identifies, that the second adjusting device switched adjusting device, its adjustment path (24 to 26) has an eccentric (25) which does not have a constant maximum penetration depth of at least the probe is adapted in its upper end position Selbsthem- * o gans. Preferably the Ausmend acts on the adjustable part (16). range of the pointer on a measuring device, which 6. Apparatus according to claim 1, characterized in that the scale value 0 is only reached with a preload, indicates that the feeler element (28) extends down to below the scale value 0,
exchangeable battery of different properties. or after setting the pointer to the value 0 AuF- 7. Apparatus according to claim 1, 2 or 3, the position and the measuring device by the predetermined distance, ins through characterized in that the first adjustment feature, that is, 2.54 mm, approaches one another. When direction a spindle (10) with self-locking equal starting conditions are created, Has thread. 5 »regardless of whether the preload is now using a contact surface or is freely adjusted, ^^^^^ then with the same spring load on the Tastor gans also achieved the same measured values. The first adjustment device is only used here to The invention relates to a test device for 55 establishing the initial load, i. H. the pointer Check the hardness of flexible materials such as the measuring device to bring it to the scale mark 0. Rubber or plastic with a hardness measuring device, the force then acting on the tactile organ entdas a counterbalance to the force of a measuring spring corresponds exactly to that force which acts on the tactile organ constant maximum penetration depth movable feeler acts when the measuring device with the otherwise vorgegewie has a displaceable stamp, with a 60 level load on the entire bearing surface on the test object Support for the test piece, one opposite it, with the same thickness and width of the test piece Support arranged holder for the measuring device are on the sensing element and during the measuring process and with an adjusting device for changing the spring acting forces of the same size. This aides The distance between the support and the measuring reading was, however, determined without predetermined surface sizes. 65 aims. In principle, the invention therefore enables Test devices of the type mentioned are used to examine test objects whose transverse dimension rule for measuring the material hardness according to Shore. sings are only a few larger than those of the tactile experience the measuring device usually has its organs. It goes without saying that the measurement results