GB2393217A

GB2393217A - Test rig system with interchangeable base plates, eg for testing fuel injection components

Info

Publication number: GB2393217A
Application number: GB0316442A
Authority: GB
Inventors: Karl-Friedri Ruesseler; Bernhard Bonse; Kurt Sprenger
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2002-07-16
Filing date: 2003-07-14
Publication date: 2004-03-24
Anticipated expiration: 2023-07-14
Also published as: GB0316442D0; GB2393217B; DE10232301A1; DE10232301B4

Abstract

The invention relates to a test rig for determining operating parameters and the function of specimens (22, 36, 40; 41, 48) with a rig bed (G, 13) and a supply and control part (12) and a base plate (11) held on the rig bed (G, 13). The base plate (11) is attached interchangeably on the rig bed (13) by means of fast clamping devices (59, 60). The base plate (11) to hold an experiment structure (54) comprises a measurement and display module (19) which can be connected via a standardised interface (21) in the form of a multiple-pin plug connection with a measurement and analysis unit (20) formed here as a workplace computer.

Description

239321 7

Test Rig for Components of Injection Systems In industrial large series production such as for example the supply industry for vehicle manufacturers, it is 5 necessary to test individual products or the overall production with regard to function ability and compliance with prespecified quality standards. While the quality testing can be automated, for tests in the application or development area, individual test instruments are still 10 required on which test procedures are performed after corresponding adaptation to the requirements of the component (specimen) to be tested.

Test rigs such as for example test benches in development 15 and application areas are extremely cost-intensive in view of the staff involvement, the requirement for erection space, energy supply, or with regard to connections to be provided for compressed air or hydraulic fluid. Test rigs also require intensive monitoring.

On short absences from the workplace of the worker responsible for a test rig, the component to be tested -

which may be fitted with measurement sensors, supply lines etc. - usually remains within the test rig so that the 25 apparatus occupied by the specimen cannot be used elsewhere. If changes or reworking are performed on the component clamped or mounted in the test rig - such as for example a fuel injector, high pressure accumulator or similar - the change or reworking of this specimen usually 30 takes place within the test rig so that the apparatus cannot be used elsewhere. If the component to be tested is removed from the test rig for the purpose of conversion or repair, the apparatus can also not be used elsewhere

during the time required for conversion or repair of the specimen, as the construction of a different test or experiment environment would be too time- and cost-

intensive. If for the further progress of the test routine or cycle, analyses of previous test results are required, the test rig is blocked for the duration of the analysis as conversion of the test rig to a different specimen 10 geometry would be too cost- and time-intensive and the further experiment procedure may not be deferred further after analysis of the test results.

In order to test components and elements of injection 15 systems produced in industrial series production, special test rigs are required for pump nozzle units (PDE), pump line nozzle units (PLD), high pressure accumulators (common rail), distributor injectors (VE) and similar.

These test rigs are similar in structure and comparable in 20 their control and measurement technology. The degree of utilization of test rigs in use today is however still unsatisfactory. With the solution proposed according to the invention, due 25 to a rapid change system on test rigs the former set-up periods can be drastically reduced. Because of the shorter set-up time required for conversion of an already occupied test rig, even on short interruptions of a test procedure the test rig can rapidly be converted for a specimen and 30 used for other test processes so that the degree of utilisation of the test rig in relation to the net test period is considerably increased.

The entire experiment structure including the test- and specimen-specific control, display and measurement devices, is installed on a base plate outside the test rig. The base plate together with the preassembled 5 experiment structure is then placed on a standardised test rig with standardized measurement technology. The premounted experiment structure with the test rig is connected via standardised mechanical and electrical connections such as for example plug connections, fast 10 couplings, data lines to an analysis computer etc. Due to the complete preassembly of a relevant experiment structure outside the test rig on an interchangeable base plate, the test rig is not blocked by preassembly of the 15 experiment structure or interruptions to the test sequence. The base plate can be attached to the test bench bed of the test rig with a few actions. Via a fast coupling, the drive of the distribution injection pump of a fuel injection system can be produced very simply.

In a first expansion stage of the test rig proposed according to the invention with a rapid change system, the electrical connections between the base plate holding the experiment structure can be implemented via a single plug 25 for the control and measurement value processing. In a further higher expansion stage with connection of a multiple-pin plug, the test rig can detect the respective type of test carrier or specimen and as a result automatically activate the measurement program to be 30 applied, for example referencing and adjustment procedures. For checking, the prespecified nominal values are automatically loaded and compared with the actual values determined. Deviations can be recorded and stored

so that complete documentation of a test procedure can be retrieved directly at the test rig. On repetition of a test cycle previously performed, the measuring instrument settings can be automatically restored for identical 5 specimens so that no readjustment of the measuring instruments is required, which has a positive effect on the duration of the test cycles performed on the test rigs with fast change technology.

10 With reference to the accompanying drawings exemplary embodiments of the invention are described in more detail below. Fig. 1 shows test area designs for various components of injection systems, Fig. 2 shows a test rig with rapid change technology for checking high pressure feed apparatus, with interchangeable base plates and associated 20 display panels, Fig. 3 shows an embodiment variant of the test rig according to the invention with interchangeable base plate and display panel 25 for pump nozzle units (PDE), Fig. 4 shows a further embodiment variant of the test rig according to the invention for testing high pressure accumulators (common rail), and Fig. 5 shows a noise-insulation hood screening the base plate with experiment structure mounted thereon.

Fig. 1 shows test areas for different components of injection systems with test rigs designed component-

specific. In the view according to figure 1 test rigs A, B. C and D are shown in diagrammatic form. The test rig A can be for example a test rig on which are tested components exposed to a pressure medium e.g. high pressure feed assemblies.

10 On test rig B distributor injection pumps can be tested with regard to their function ability and production tolerances. On test rig C pump nozzle units (POE) or pump line nozzle units (PLD) can be tested for function ability. Test rig D is used for testing the pressure 15 resistance of high pressure accumulators (common rail).

Each of the test rigs A, B. C and D has a support E which is firmly fixed in the test rig A, B. C, D. On each machine bed G of the test rigs A, B. C, D is a control and supply part F on which are held the energy supply 20 connections, drives, and control and data transmission lines. Each application or development area in which are produced the specimens concerned which may be subjected to testing 25 on test rigs A, B. C or D, can by conversion of the test rigs A, B. C, D to a rapid change test rig 10 achieve an increase in the utilization degree of the test rig 10. In contrast to test rigs A, B. C, D, the test rig 10 proposed according to the invention has an interchangeably arranged 30 base plate 11 which is held interchangeably by means of fast clamping devices 59, 60 on the rig bed 13 of the test rig 10. The test rig 10 proposed according to the invention also comprises a supply and control part 12 held

stationarily on the rig bed 13, within which part is fitted a drive and a standardized measurement environment.

The interchangeable base plate 11 can be removed from the rig bed 13 of the test rig 10 within a very short time via 5 the fast clamping devices 59, 60. The fast clamping devices 59 and 60 can be formed as screws, a latch connection or screw-in toggle clamps. Rapid assembly or disassembly of an interchangeable base plate 11 can also take place via hydraulic fixing, by the provision of fit 10 connections such as for example pins or guides.

Furthermore rapid assembly or disassembly of an interchangeable base plate 11 on the rig bed 13 can take place for example via threaded rods with stepper motors, where the threaded rod holds the interchangeable base 15 plate 11 firmly on the rig bed 13.

Figure 2 shows a test rig with rapid change technology for testing high pressure feed assemblies with interchangeable base plate and display panel connected to this.

The test rig 10 for testing combustion engine injector system components exposed to pressurised media, e.g. distributor injection pumps 22, comprises an interchangeable base plate 11 which has a first holder arm 25 17 and a second holder arm 18. On the upper end of the first holder arm 17 and second holder arm 18 is held a control and display module 19 holding several display instruments which lie in the field of vision of the worker

operating the test rig 10 according to figure 2 and are 30 therefore clearly visible. The individual measurement or display instruments on the control and display module 19 are connected via data transfer lines 20.1, 20.2, 20.3, 20.4, 20.5 and 20.6 with a multiple-pin plug element 21

which constitutes a standardized interface to a computer unit 20. The computer unit 20 can for example be formed as a personal computer (PC), as a workplace computer.

5 The rig bed 13 holding the interchangeable base plate 11 comprises a supply and control part 12 in which is held a drive motor 28 not shown here in detail. Via a test rig control connection 29, 30 also provided in standardised form, the rig bed 13 of the test rig 10 is connected with 10 a measurement value sensor 20, for example a workplace computer. The test rig control connection 29, 30, like the data transfer lines 20.1, 20. 2, 20.3, 20.4, 20.5 and 20.6 of the multiple-pin plug element 21, runs to the workplace computer 20. By means of the multiple-pin plug element 21 15 all current PC interfaces can be addressed i.e. for example serial interface RS-232, IEEE488 and a PCI bus e.g. for temperature, pressure and various displays. In addition a CAN card or a CPU card can be used to control the pump control devices. Using a CAN card all process 20 measurement and control values can be transferred.

The interchangeable base plate 11 comprises a groove guide 14 which is created in the embodiment variant of the test rig 10 according to the invention in figure 2 as an outer 25 groove guide. The groove guide 14 extends over an outer edge 15 of the rig bed 13. On the top 16 of the interchangeable base plate 11 are held the specimens and their environment as will be explained below. The interchangeable base plate 11 is connected with the rig 30 bed 13 via fast clamping devices 59 and 60, where the fast clamping devices 59 and 60 in the simplest case can be designed as through bolts or toggle elements. As well as the design of the fast clamping devices 59 and 60 as

through bolts or toggle elements, the fast clamping devices 59 and 60 can also be formed as toothed plug connections, toothed belts, play-free claw couplings, articulated shafts, silent blocks (rubber or elastomer 5 discs) . Alternatively textile discs can be used which are fixedly arranged or for example can be pushed over the claws of the coupling. The supply and control part 12 of the test rig 10 comprises a fast coupling 26 connected with the drive motor 28. The fast coupling 26 contains a 10 drive shaft 27 which acts on a cone-like coupling piece, with which a drive can be introduced into a specimen to be tested - in the case shown in figure 2, a high pressure feed pump 22.

15 The experiment structure shown in figure 2 held on the top 16 of the interchangeable base plate 11 serves for testing the operating parameters or determining the function suitability of a specimen 22 held on clamping bracket 31, said specimen taking the form of a high pressure feed 20 device such as for example a distribution injector pump as used in fuel injection systems. The clamping bracket 31 is welded to the top 16 of the interchangeable base plate 11.

The clamping bracket 31 contains a flange with clamping lugs which have different pitch circles. The flange itself 25 is fixed via a large insert to the clamping bracket 31 whereas the specimen 22 or 40 via a small insert is fixed to the flange. Thus a central attachment is guaranteed.

The high pressure feed device held on the clamping bracket 30 31 as a specimen 22, for example a distribution injector pump, is connected via a control and data transfer line 34 with the multiple-pin plug element 21 which constitutes a standardized interface. The specimen 22 is supplied with a

pressure medium, such as for example diesel fuel, contained in a storage tank 23 via a pressure line held at the inlet connection 32. At the outlet connection 33 is connected a pressure line 24 which extends from the outlet 5 connection 33 to a pressurizable component held on a nozzle holder combination receiver 25. The storage tank 23 containing the pressure medium, e.g. diesel fuel, is also connected via a data transfer line 35 with the multiple-

pin plug element 21 on the control and display module 19.

10 Item 34 is the electrical connecting line to an injection quantity indicator. Via the electrical connection line valves are controlled and the data for the injection quantity with the corresponding temperature transferred via the multiple-pin plug element 21 to the workplace 15 computer 20.

The specimen 22 can be driven via the coupling piece which passes through the second holder arm 18 on the interchangeable base plate 11. The coupling of the drive 20 motor 28 formed as a fast clamping coupling 26 introduces the drive to the specimen 22 which is exposed to a high pressure medium via the storage tank 23 at the inlet connection 32. Via the test rig control connection 29 allocated to the rig bed 13, the rotation speed of the 25 drive motor 28 driving the specimen 22 in the supply and control part 12 can be transferred to a measurement value sensor 30. The data which are acquired during the test process of the specimens arranged on the top 16 of the interchangeable base plate 11, and which are displayed to 30 the workers at the measurement and display devices of the control and display module 19, are transferred via the standardized interface in the form of a multiple-pin plug

element 21 to a workplace computer 20 and can there be documented or output in graphic form.

Figure 3 shows a further embodiment variant of the test 5 rig proposed according to the invention with interchangeable base plate and held on this the measurement and control module, with which pump nozzle units (PDE) can be tested in the application or development area.

The interchangeable base plate 11 with measurement and display module 19 arranged thereon is also interchangeably connected via fast clamping devices 59, 60 with the rig bed 13. The interchangeable base plate 11 comprises a 15 groove guide 14 constructed as an outer groove guide which engages with an outer edge 15 of the rig bed 13.

In contrast to the embodiment variant shown in figure 2 of the test rig 10 proposed according to the invention, on 20 the top 16 of the interchangeable base plate 11 is held a specimen 36 in the form of a PDE/PLD system. Pump nozzle units (PDE) or pump line nozzle units (PLD) require for testing the introduction of a cam movement via the drive

motor 28. For this the coupling piece of the fast clamping 25 coupling 26 which is driven via a drive shaft 27 by the drive motor 28, is connected via a drive shaft 39 lying in a camshaft housing 36 with cams held for example between two tapered roller bearings. The specimen e.g. the pump nozzle unit (PDE) or pump line nozzle system (PLD) lies in 30 the camshaft housing 36 or is arranged between the camshaft housing 36 and the storage tank. Via the electrical connecting line 35 the data relevant to the injection quantity are transferred and via a multiple-pin

plug element 21 serving as a standardized interface passed to a workplace computer in the shape of PC 20. On the interchangeable base plate 11, in the same way as in the embodiment variant shown in figure 2 of the test rig 10 5 proposed according to the invention, the individual measuring instruments held on the measurement and display module 19 are connected via data transfer lines 20.1, 20.2, 20.3, 20.4, 20.5 and 20.6 with the multiple-pin plug element 21 serving as a standardised interface and can be 10 connected via this with the workplace computer 20. The interchangeable base plate 11 with its experiment structure held on the top 16 via fast clamping devices 59 or 60 is also connected with the rig bed 13 and can easily be attached to this and also easily removed. To perform 15 the test cycle concerned the top 16 of the interchangeable base plate 11 is erected outside the test rig 10. After erecting the experiment structure on the top of the interchangeable base plate 11, this is mechanically attached via the fast clamping devices 59 and 60 using the 20 groove guide 14 to the top of the rig bed 13. Via a central standardized interface in the form of a multiple pin plug element 21, the unit comprising the interchangeable base plate 11 and measurement and display module 19 is electrically connected with the workplace 25 computer 20. The rig bed 13 of the test rig 10 which holds the electrical drive 28 within the supply and control part 10 is connected via an also standardized test rig control connection to a measurement value sensor 30. The measurement value sensor 30 can for example be the said 30 workplace computer 20 which receives firstly the data transmitted via the test rig connection point 29 and secondly that transmitted via the multiple-pin plug element 21.

The specimen 36 arranged in the embodiment variant in figure 3 of the test rig 10 proposed according to the invention has in its upper area a cam element 38 which is 5 driven via the cam drive 39 by the drive motor 28 held within the supply and control part 12.

Figure 4 shows a further embodiment variant of the test rig proposed according to the invention with which high 10 pressure accumulators (common rail) can be tested.

In the embodiment variant shown in figure 4 of the test rig 10, at the clamping bracket 31 on the top 16 of the interchangeable base plate 11 is held a high pressure pump 15 40. The high pressure pump 40 is driven via the coupling piece of the fast clamping coupling 26 via the drive motor 38 in the supply and control part 12. The drive from the drive motor 28 is transferred to the coupling piece of the fast clamping coupling 26 via a drive shaft 27. The 20 coupling piece of the fast clamping coupling 26 extends through the second holding arm 18 which is connected with the interchangeable base plate 11. Via the high pressure pump 40 a specimen 41 in the form of an essentially tubular high pressure accumulator (common rail) is exposed 25 to high pressure medium, for example diesel fuel. The tubular high pressure accumulator 41 is held at the clamping points 42 and exposed to high pressure fuel via the high pressure pump 40 at a fuel inlet 43. The high pressure accumulator 41 comprises fuel outlets 44. One of 30 the fuel outlets 44 is connected via a high pressure line 49 with a fuel injector 48 held in an injector holder 46.

The fuel injector 48 has a high pressure connection 47 to which is connected the high pressure line 49 with the fuel

injector 48. Via a further fuel outlet 44 fuel flows from the inside of the high pressure accumulator 41 into an EMI unit 45 containing a storage reservoir. The term "EMI unit" refers to an injection quantity indicator which 5 records data on the injection quantity and injection temperature. The embodiment variant shown in figure 4 of the test rig 10 according to the invention serves for testing or performance of experiments relating to pressure-resistance and to determine other operating 10 parameters of high pressure accumulators 41 which are essentially tubular. To hold this essentially tubular high pressure accumulator 41, the clamping points 42 can be constructed as clamping claws. The experiment structure to be installed on the top 16 of the interchangeable base 15 plate 11 for exposing the high pressure accumulator 41 to the pressure medium comprises a fuel injector 48 which is connected via the high pressure line 49 to the high pressure accumulator 41. As well as this a storage container 45 is required which collects the excess fuel 20 volume flowing out of the inside of the high pressure accumulator 41 and transported by the high pressure pump 40. The fuel injector 48 can be mounted in the injector holder 46, the storage tank 45 on the top 16 of the interchangeable base plate 11, and the high pressure pump 25 40 in the clamping bracket 31 of the interchangeable base plate 11, without the interchangeable base plate 11 being held on the rig bed 13 of the test rig 10 proposed according to the invention. This can be occupied by another base plate 11 prepared elsewhere and holding 30 another experiment structure. This interchangeable base plate 11 holding a further experiment structure can be held releasably on the top of the rig bed 13 via the fast clamping devices 59, 60. Thus the net utilization time of

the test rig 10 proposed according to the invention can be increased substantially, as to change the interchangeable base plate 11 - when performing other tests with other specimens and other test parameters only one mechanical 5 connecting point 59 and 60 respectively and one standardized interface in the form of the multiple-pin plug element 21 need be released and reattached.

The embodiment variants shown in figures 2, 3 and 4 of the 10 test rig 10 according to the invention have as a common feature the fact that the electrical connection between the interchangeable base plate 11 and the measurement and display module 19 held thereon is created via a multiple pin plug element 21 constituting a standardised interface.

15 This constitutes the interface for the control and measurement value processing which can take place for example on a workplace computer 20 (PC). In addition data to control the rig bed 13 and the electrical drive 28 can be transmitted to the workplace computer 20 via the test 20 rig control connection 29. As well as the electrical connection of the interchangeable base plate 11 with the test rig 10, the mechanical connection between the interchangeable base plate 11 and the rig bed 13 is created via the fast clamping devices 59 and 60 shown.

In a further extension stage of the test rig 10 proposed according to the invention, on connection of the multiple pin plug element 21 this recognises the type of specimen 22, 36, 40; 41, 48 which is held on the top 16 of the 30 interchangeable base plate 11 within a particular experiment structure 54. Depending on the recognised type of specimen 22, 36, 40; 41, 48, the necessary measurement programs can be activated automatically, for example for

referencing and compensation. The nominal values relevant for the different specimens 22, 36, 40; 41, 48 can be preloaded automatically and compared with the actual values recorded during the test cycle. Deviations between 5 the nominal values automatically preloaded for the specimens 22, 36, 40; 41, 48 can be displayed and output directly via the workplace computer 20. In the performance of test cycles or experiment cycles which have been preceded by a test series and in which the identical 10 specimen 22, 36, 40; 41, 48 was used, the measuring instrument settings in the measurement and display module 19 on the interchangeable base plate 11 can be automatically restored. The specimen 22, 36, 40; 41, 48 can be identified for example by means of a module number 15 which corresponds to the number of the respective interchangeable base plate 11 holding the experiment structure 54. The interchangeable base plates 11 can be numbered sequentially depending on their quantity. The values of the sensors, pumps, control modules etc. on the 20 interchangeable base plates 11 constituting the module are stored in a program to which the workplace computer 20 has access. The specimens 22, 36, 40; 41, 48, i.e. for example a common rail pump, fuel injector, distributor injection pump, PDE or PLD system, can be placed on different 25 interchangeable base plates 11. The data or settings once set such as the oscilloscope setting can be stored with the relevant device driver in the system and reloaded when required. This also takes place via the multiple-pin plug element 21 which constitutes a largely standardised 30 interface to the workplace computer 20.

Figure 5 shows a base plate with experiment structure held thereon screened by a sound-insulating hood.

The experiment structure held on the top 16 of the interchangeable base plate 11 is marked with reference figure 54 and in the view in figure 5 is shown merely 5 diagrammatically. The interchangeable base plate 11 is connected releasably with the rig bed 13 via fast clamping devices 59 or 60 which can be designed as clamping screws, toggle clamps or similar. The rig bed 13 has for its part on its underside attachment rails 55. The experiment 10 structure 54 held on the top 16 can for example comprise a high pressure pump 22 or 40 driven via the drive shaft 27 from drive motor 28. On the top 16 of the supply and control part 12 surrounding the drive motor 28, in the embodiment example in figure 5, is held a swivel axle 51.

15 A screening hood 50 can be moved about this swivel axle 51 in swivel direction 52 indicated by the arrow. The screening hood 50 can be swivelled from its closed position 50.1 to its open position 50.2 and vice versa.

The swivel range described by the screening hood 50 on 20 movement about the swivel axis 51 is indicated by reference 56. A lower edge 53 of the screening hood 50, in the lowered position 50.2 of the screening hood 50, lies on the top of the rig bed 13 holding the interchangeable base plate 11. The screening hood 50 can be made of sound 25 insulating but transparent material so that the worker operating the test rig 10 can visually monitor the progress of the test cycle. In particular it is possible to read the measuring instruments held on the measurement and display module 19 so that the worker operating the 30 test rig 10 can intervene in the test cycle if necessary at any time.

As an alternative to a swivel movement about swivel axis 51 on the top of the supply and control part 12, the screening hood 50 can also be moved in a displacement direction 58 which extends perpendicular to the drawing 5 plane of the view in figure 5. In this embodiment variant of the movement direction of the screening hood 50, the sides of the screening hood 50 are omitted so that a movement of the screening hood 50 surrounding the experiment structure 54 is possible manually or 10 electrically without hindrance. The screening hood 50 shown in figure 5 and mobile about swivel axis 51 can be used on any of the test rigs 10 according to the embodiment variants in figures 2, 3 and 4, whereby the noise level from the test cycles in progress in test areas 15 in production lines can be substantially reduced. In addition the screening hood 50 held relative to the interchangeable base plate 11 on the rig bed 13 constitutes work protection in order to protect the worker operating the test rig 10 against accidents.

Reference List A Test rig high pressure feed assembly B Test rig distributor injection pump 5 C Test rig PDE/PED D Test rig high pressure accumulator E Support F Control and supply part G Machine bed 10 Fast change test rig 11 Interchangeable base plate 12 Supply and control part 13 Rig bed 15 14 Groove guide 15 Outer edge of rig bed 16 Top of base plate 17 First holding arm 18 Second holding arm 20 19 Control and display module 20 Workplace computer 20.1) 20.2) 20.3) 25 20.4) Data transfer lines 20.5) 20.6) 21 Multiple-pin plug element 22 High pressure feed assembly (VE) specimen 30 23 Storage tank 24 Pressure line 25 Nozzleholder combination receiver 26 Fast coupling

27 Drive shaft 28 Drive motor 29 Test rig control connection 30 Measurement value sensor 5 31 Clamping bracket 32 Inlet connection 33 Outlet connection 34 Specimen control line 35 Electrical connection line (EMI) 10 36 Camshaft housing with PDE/PLD specimen inserted 37 Upper storage tank 38 Cam unit 39 Cam drive PDE system 40 High pressure pump 15 41 High pressure accumulator body 42 Clamping point 43 Fuel inlet 44 Fuel outlet 45 EMI with storage container 20 46 Injector holder 47 High pressure connection for injector 48 Fuel injector 49 High pressure line 50 Screening hood 25 50.1 Lowered position 50.2 Open position 51 Swivel axis 52 Swivel direction 53 Edge of screening hood 30 54 Experiment structures 55 Attachment rail 56 Swivel area

58 Displacement direction 59 First fast clamping device 60 Second fast clamping device

Claims

Claims

1. Test rig for determining operating parameters and functions of specimens (22, 36, 40; 41, 48) with a 5 rig bed (G. 13) and a supply and control part (12) and a base plate (11) held on the rig bed (13), characterized in that the base plate (11) can be attached interchangeably to the rig bed (13) by means of fast clamping devices (59, 60) and comprises a 10 measurement and display module (19) which has a standardized interface (21) to a workplace computer unit (20).

2. Test rig according to claim 1, characterized in that 15 the base plate (11) is held in a groove guide (14) on the rig bed (13).

3. Test rig according to claim 2, characterized in that the groove guide (14) is formed as an outer groove 20 guide engaging with an outer edge (15) of the rig bed (13). 4. Test rig according to claim 1, characterized in that the base plate (11) with the measurement and display 25 module (19) constitutes an interchangeable module which has data transfer lines (20.1, 20.2, 20.3, 20.4, 20.5, 20.6) and control lines (34, 35) for the specimen (22, 36, 40; 41, 48) to be tested.

30 5. Test rig according to claim 1, characterized in that the rig bed (13) has a standardized test rig control connection (29, 30) which is connected with a workplace computer (20).

6. Test rig according to claim 1, characterized in that the interchangeable base plate (11) has holding devices (25, 31) for specimens (22, 36, 40; 41, 48) 5 which can be exposed to pressurised media via a storage tank (23, 37, 45).

7. Test rig according to claim 1, characterized in that the interchangeable base plate (11) co-operates with 10 a fast clamp coupling (26) of the drive (28) in the supply and control part (12) of the test rig (10), which coupling directly drives specimens (22, 36, 40 41, 48) transporting a medium.

15 8. Test rig according to claim 1, characterized in that via a fast clamping coupling (26) on the drive (28) in the supply and control part (12) of the rig bed (13), specimens (41) storing a medium can be pressurized directly.

9. Test rig according to claim 4, characterized in that the module containing the interchangeable base plate (11) and the measurement and display module (19) can be connected mechanically via the fast clamping 25 device (59, 60) with the rig bed (13) and electrically via a multiple- pin plug connection (21) with a workplace computer (20).

10. Test rig according to claim 4, characterized in that 30 on assembly of an interchangeable base plate (11) holding an experiment structure (54) on the rig bed (13) of the test rig (10), and on connection of the multiple-pin plug element (21) with the test rig

(10), the type of specimen (22, 36, 40; 41, 48) held on the interchangeable base plate (11) is detected.

11. Test rig according to claim 10, characterized in that 5 on connection of the multiple-pin plug element (21) on the supply and control part (12), specific nominal measurement values relevant to the specimen (22, 36, 40; 41, 48) concerned are loaded and compared with actual values, where the identification of the 10 specimens (22, 36, 40; 41, 48) held on the interchangeable base plates (11) is stored in the workplace computer (20).

12. Test rig according to claim 1, characterized in that 15 the interchangeable base plate (11) and the specimens (22, 36, 40; 41, 48) held thereon can be covered with a swivellably mounted hood-like screening element (50) which is mobile relative to the supply and control part (12) of the rig bed (13).

13. Test rig according to claim 12, characterized in that the hood-like screening element (50) is mobile about a swivel axis (51) from a lowered position (50.1) to an open position (50.2) and vice versa.

14. Test rig according to claim 12, characterized in that the hood-like screening element (50) is displaceable in the transverse direction (51) relative to the supply and control part (12).

15. A test rig substantially as herein described with reference to the accompanying drawings.