DE10162004B4 - Test bench for test objects - Google Patents

Abstract

Test stand for test specimens (7) with a test specimen carrier (1) for receiving a test specimen (7) and a drive device that can be coupled to it with clamping cylinders (2) arranged on the test specimen carrier (1) for fastening the test specimen (7) to the test specimen carrier (1) , The position of the clamping cylinders (2) relative to the specimen carrier (1) can be changed via position drives (12, 17), the radial position and the angular position of the clamping cylinders (2) being able to be changed independently of one another, characterized in that the angular position of each clamping cylinder (2) can be adjusted via a dental arch segment (21) and a gear wheel (20) which engages with it and which drives a motor directly or indirectly.

Description

The invention relates to a test bench for test specimens according to the kind defined in the preamble of claim 1.

Test benches of the generic type have a test specimen carrier on which the test specimen is fastened with the aid of clamping cylinders. In order to ensure a rational operational process, it is important to be able to change the test object quickly and easily on the test bench. In series production in particular, it is necessary to be able to change different types of test specimens with different external dimensions and external shapes quickly and easily and to clamp them on the test bench again.

The DE 39 05 983 A1 discloses a test bench for gearboxes, in which the test specimen is clamped onto a test specimen carrier via clamping cylinders and the test specimen carrier is arranged on a turntable, on which several test specimen carriers can be arranged. This makes it possible to clamp several test specimens at the same time. If tension of the test specimens is only desired or required in the test position, clamping devices can also be provided on a separate, stationary support, which are positioned such that they can be brought into engagement with the test specimen located in the test position. However, if the dimensions or the external shape of the test object change, new test specimen carriers must be mounted on the turntable. The construction of a turntable with several test specimen carriers also proves to be very cost-intensive.

From the DE 295 18 753 U1 A propeller shaft testing device with a clamping device is known. The cardan shaft test device consists of a test stand, the test stand in turn consisting of a cardan shaft clamping device, a motor-driven drive unit and an angle of rotation sensor arranged thereon.

The JP H09-126 935 A describes a tire centering device for a tire testing machine that positions a center of a tire to coincide with a center of a rim of the tire testing machine.

The DE 1 066 071 A discloses a multi-jaw chuck in which the radial adjustment of the clamping jaws is carried out by rotating a ring mounted in the chuck body with spiral cam grooves. For each of one or more clamping jaws, a ring containing the cam grooves is provided, in which jointly arranged coupling levers, which are arranged between the jaws and which are pivotably mounted in a drive ring lying concentrically between the rings, engage.

From the WO 99/50 013 A1 a device for clamping ring-shaped workpieces, in particular ball cages of constant velocity joints, for machining on a machine tool with a drivable workpiece spindle is known. A clamping device is arranged on the workpiece spindle, which comprises a plurality of clamping elements and which cooperate with clamping surfaces formed on the workpiece in order to hold the workpiece against rotation. The clamping elements can be locked in the clamping position.

The present invention has for its object to provide a test stand for test specimens, in particular for gearboxes, in which test specimens with different external dimensions and external shapes can be accommodated without having to change or store several different test specimen carriers.

The task is solved with a generic test stand for test objects, which also has the characterizing features of the main claim.

The invention relates to a test stand for test specimens with a test specimen carrier and a drive device that can be coupled to the test specimen, with clamping cylinders arranged on the test specimen carrier, for fastening the test specimen to the test specimen carrier. The clamping cylinders are provided with position drives, by means of which the position of the clamping cylinders in relation to the test specimen carrier can be changed. The radial position and the angular position of the clamping cylinders can be changed independently of one another. It is possible here to store a position of the clamping cylinders assigned to a test object in a computing unit, as a result of which the position of the clamping cylinders is set automatically when testing this test object. The angular position of each clamping cylinder can be adjusted by means of a dental arch segment and a gear wheel which engages with it and which is driven indirectly or directly by a drive motor. The dental arch segment is connected to an adjustment slide and this is connected to the clamping cylinder. The adjusting slide for the elbow fitting preferably has sliding guides on the inner and outer guide ring in the circumferential direction. These are preferably plastic-coated and have central lubrication, which ensures low-friction operation.

Required hose lines and cable connections for energy supply are arranged in energy supply chains and through them Damage protected. The radial adjustment of the clamping cylinder to the central drive is preferably carried out via motors with brakes and absolute encoders, which are preferably via a deflection gear, for. B. a bevel gear or belt drive, a ball screw drive. The spindle nut is connected to a linear slide on which the hydraulic clamping cylinder is attached. The linear slide is preferably mounted on slide guides, which are distinguished by the high static point loads. In order to change the test specimen, the clamping cylinders, which are radially adjustable, are moved to the maximum radial distance from the central drive, which means that the test specimen can be exchanged without disruptive clamping cylinders. The clamping cylinders are preferably designed as hydraulic piston cylinders, which have a large clamping stroke and are equipped with slim clamping arms at the end of the piston. This makes it possible to attach a wide variety of workpiece contours to the test specimens. The actuation of the clamping cylinder is preferably monitored for pressure and end positions in order to ensure that the test specimen is securely attached. For simpler applications, there is also the option of connecting manual, hydraulic or pneumatic adjustment devices with and without a measuring system to the clamping cylinders. In order to ensure a defined position of the test object on the test bench, the test bench has positioning pins which protrude from the test object carrier and engage in defined recesses in the test object, which ensures exact positioning of the test object on the test bench. In order to be able to center different test objects with different arrangements of defined recesses on the test bench, the test object carrier has a large number of position pins, which can preferably be lowered into the test object carrier by spring force and moved out of the test object carrier with the aid of pressure. This makes it possible to center different test specimens on the test stand depending on the pressure applied to defined position pins. The position pins are preferably arranged in a separate carrier ring which is rotatably mounted. The rotary movement is preferably carried out via a motor with a brake and absolute encoder, which engages via a planetary gear and a pinion in a toothed segment connected to the carrier ring. The carrier ring is preferably mounted on a slide bearing and, in order to reduce vibrations during the test, the carrier ring is preferably pressed against the specimen carrier by means of two spring tensioning units. The preferably hydraulic tensioning cylinders additionally increase the contact pressure and stiffen the entire structure. In order to improve the positioning accuracy of the test object on the test bench, the carrier ring is positioned on stops. These positions are preferably queried using precision switches. The position pins are preferably actuated hydraulically with end position monitoring. The position pins are moved back into their basic position via a spring return. The pressure medium is preferably supplied via hydraulic rotary unions. All positions of the clamping cylinders and the position pins are preferably freely programmable fully automatically. This makes it possible to test a wide variety of test objects on a test bench with a test object carrier.

Further features can be found in the description of the figures.

• 1 eine Abbildung des Prüfstands mit Prüflingträger und Spannzylinder;
• 2 einen Prüflingträger mit Spannzylinder und Prüfling;
• 3 einen Prüflingträger mit Spannzylinder und Prüfling;
• 4 einen Schnitt durch den Prüfstand;
• 5 eine Vorderansicht des Prüfstands und
• 6 eine Ansicht der Rückseite des Prüfstands.

Show it:

• 1 an image of the test bench with test specimen carrier and clamping cylinder;
• 2 a test specimen carrier with clamping cylinder and test specimen;
• 3 a test specimen carrier with clamping cylinder and test specimen;
• 4 a section through the test bench;
• 5 a front view of the test bench and
• 6 a view of the back of the test bench.

Fig. 1:

On the test specimen carrier 1 are clamping cylinders 2 with clamping elements 3 arranged. By pressurizing the clamping cylinder 2 the clamping element moves 3 towards the test specimen carrier and thus presses a test specimen on the test specimen carrier onto the test specimen carrier. The clamping cylinders are in linear guides 4 stored and can be moved radially. Every clamping cylinder 2 is a dental arch segment 5 assigned, which with an adjustment slide 6 connected is. Will the dental arch segment 5 driven, so change the clamping cylinders 2 their position to each other.

Fig. 2:

A candidate 7 is about clamping elements 3 on the test specimen carrier 1 pressed and thus attached to it. Depending on the external shape of the test object 7 was the angular position and the radial position of the clamping elements 3 changed so that the examinee 7 on the specimen carrier 1 can be attached.

Fig. 3:

clamping elements 3 press the test object 7 on the test specimen carrier 1 , The test object can be changed by changing the angular position and the radial position 7 on the specimen carrier 1 be attached.

Fig. 4:

clamping elements 3 are on a clamping cylinder 2 attached. When the clamping cylinder is actuated 2 becomes a test object, not shown, over the clamping elements 3 on a carrier ring 8th which on the test specimen carrier 1 attached, pressed. In the carrier ring 8th are position pins 9 arranged which about spring force of the spring 10 are held in their starting position. By pressurizing the cylinder 11 becomes the position pin 9 from the carrier ring 8th moved out to take over the function of a centering pin for the test object. The carrier ring 8th has multiple position pins 9 which, depending on the test object, can be pressurized independently of each other. The carrier ring 8th is rotatable in the test specimen carrier 1 stored and can via a drive motor 18 be rotated. The drive motor 12 drives via a reversing gear 13 and a ball screw 14 with spindle nut 15 a linear slide 16 on. Depending on the direction of rotation of the drive motor 12 , the clamping cylinder 2 can be adjusted in its radial direction. The drive motor 17 drives via a planetary gear 19 a gear 20 which with a dental arch segment 21 is in operative connection, whereby the clamping cylinder 2 is changeable in its angular position.

Fig. 5:

Via position pins 9 , which can optionally be pressurized, can be a test specimen, not shown, on the carrier ring 8th be centered. About clamping elements 3 the test object is placed on the carrier ring 8th pressed. The angular adjustment of the clamping elements 3 to each other is done by a gear 20 with a dental arch segment 21 is in operative connection. About the drive motor 12 , the reversing gear 13 and the linear slide 16 the clamping elements are moved in the radial direction. By automatically, depending on the test object, the position pins 9 activated, the carrier ring 8th twisted, the tensioning elements 3 are changed in the radial direction and in their angular position to each other, it is possible to test a wide variety of test objects on a test bench.

Fig. 6:

The carrier ring 8th stands over a dental arch segment 22 with the drive motor 18 in operative connection and is rotatably mounted.

LIST OF REFERENCE NUMBERS

1

Prüflingträger

2

clamping cylinder

3

clamping elements

4

linear guides

5

Sector gear

6

Adjustable slide

7

examinee

8th

support ring

9

positioning pins

10

feather

11

cylinder

12

drive motor

13

deflecting

14

Ballscrew

15

spindle nut

16

linear slide

17

drive motor

18

drive motor

19

planetary gear

20

gear

21

Sector gear

22

Sector gear

Claims (7)

Test stand for test specimens (7) with a test specimen carrier (1) for receiving a test specimen (7) and a drive device that can be coupled to it with clamping cylinders (2) arranged on the test specimen carrier (1) for fastening the test specimen (7) to the test specimen carrier (1) , The position of the clamping cylinders (2) to the test specimen carrier (1) can be changed via position drives (12, 17), the radial position and the angular position of the clamping cylinders (2) being able to be changed independently of one another, characterized in that the angular position of each clamping cylinder (2) is adjustable via a dental arch segment (21) and a gear wheel (20) which engages with it and which drives a motor directly or indirectly. Test bench for test objects Claim 1 , characterized in that position pins (9) are arranged on the test specimen carrier (1), via which the position of the test specimen (7) relative to the test specimen carrier (1) can be defined. Test bench for test objects Claim 2 , characterized in that the position pins (9) are optionally arranged independently of each other in the test specimen carrier (1) retractable and extendable. Test bench for test objects Claim 1 , characterized in that the test specimen carrier (1) is arranged rotatable about its center. Test bench for test objects Claim 1 , characterized in that defined positions of the clamping cylinders (2) and position pins (9) can be selected, called up and stored via a computing unit for defined test objects. Test bench for test objects Claim 1 , characterized in that the drive motor (12, 17, 18) is a motor with a brake and absolute encoder. Test bench for test objects Claim 1 , characterized in that the radial position of the clamping cylinder (2) via a linear slide (16) which can be driven by a drive motor (17) and a ball screw drive (14, 15) can be changed.

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