CN218847603U - Fatigue strength's testing arrangement - Google Patents
Fatigue strength's testing arrangement Download PDFInfo
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- CN218847603U CN218847603U CN202223186830.7U CN202223186830U CN218847603U CN 218847603 U CN218847603 U CN 218847603U CN 202223186830 U CN202223186830 U CN 202223186830U CN 218847603 U CN218847603 U CN 218847603U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The utility model discloses a fatigue strength's testing arrangement, include: the device comprises a mounting seat, a driving motor, a belt transmission device, a lead screw nut transmission device, a loading device and a fixing device for fixing a piece to be tested; the belt transmission device comprises a driving wheel and a driven wheel with the diameter larger than that of the driving wheel, and the driving wheel drives the driven wheel to move through a belt; the driving motor is arranged on the mounting seat, and an output shaft of the driving motor is fixedly connected with the driving wheel; the screw nut transmission device comprises a screw rod arranged on the mounting seat and a transmission screw nut seat arranged on the screw rod, and one end of the screw rod is fixedly connected with the driven wheel; the loading device comprises a push-pull force meter and a flange shaft, one end of the push-pull force meter is fixedly connected with the transmission screw nut seat, the other end of the push-pull force meter is detachably connected with the flange shaft, and the flange shaft is detachably connected with the piece to be tested. The testing device for overcoming the fatigue strength is usually provided with a speed reducer to reduce the rotating speed of a driving motor so as to increase the torque, and the speed reducer is easily damaged by vibration and influences the normal use.
Description
Technical Field
The utility model relates to a lathe detects technical field, especially relates to a fatigue strength's testing arrangement.
Background
The load borne by the components of the mechanical equipment, such as the ram and the screw nut housing on the machine tool, may not only change in magnitude but also change in direction, and is generally referred to as alternating load. The alternating loads cause alternating stresses within the component parts that cause the material to crack, a phenomenon known as material fatigue. The maximum stress at which a material can withstand an infinite number of alternating loads without failure is known as the fatigue strength. Fatigue strength testing is necessary because the fatigue strength testing device is required to perform fatigue strength testing during the production and manufacturing process.
The testing arrangement of fatigue strength chooses driving motor as the power supply usually for use, and for the increase moment of torsion, the speed reducer is installed usually to the testing arrangement of current fatigue strength and reduces driving motor rotational speed, and the vibration that produces in the testing process of fatigue strength can directly be transmitted to the speed reducer from the speed reducer output inside, and parts such as internal bearing and gear damage is accelerateed, causes the life reduction of speed reducer, and easy damage influences the normal use of the testing arrangement of fatigue strength.
Disclosure of Invention
The utility model provides a fatigue strength's testing arrangement to overcome fatigue strength's testing arrangement installs the speed reducer usually and reduces driving motor rotational speed with the increase moment of torsion, and the speed reducer receives the vibration influence that produces in the test procedure to lead to life to reduce, damages easily, influences fatigue strength's testing arrangement's normal use.
In order to realize the purpose, the technical scheme of the utility model is that:
a fatigue strength testing apparatus comprising: the device comprises a mounting seat, a driving motor, a belt transmission device, a lead screw nut transmission device, a loading device and a fixing device for fixing a piece to be tested;
the belt transmission device comprises a driving wheel and a driven wheel with the diameter larger than that of the driving wheel, and the driving wheel drives the driven wheel to move through a belt;
the driving motor is arranged on the mounting seat, and an output shaft of the driving motor is fixedly connected with the driving wheel;
the screw nut transmission device comprises a screw rod arranged on the mounting seat and a transmission screw nut seat arranged on the screw rod, and one end of the screw rod is fixedly connected with the driven wheel;
the loading device comprises a push-pull force meter and a flange shaft, one end of the push-pull force meter is fixedly connected with the transmission screw nut seat, the other end of the push-pull force meter is detachably connected with the flange shaft, and the flange shaft is detachably connected with the piece to be tested.
Further, the axis of the lead screw is parallel to the axis of the flange shaft.
Further, the axis of the lead screw is perpendicular to the axis of the flange shaft.
Furthermore, the guide mechanism comprises a guide rail and a sliding block, the guide rail is fixedly connected with the mounting seat, the guide rail is parallel to the axis of the lead screw, the sliding block is fixedly connected with the nut seat of the transmission lead screw, and the sliding block can slide along the guide rail.
Further, the mounting base comprises a motor support, a vertical plate and a base, and the motor support and the base are respectively fixed on two sides of the vertical plate; the driving motor is fixed on the motor support; one end of the screw rod, which is close to the driven wheel, is rotatably connected with the vertical plate, and the other end of the screw rod is rotatably connected with the base.
Furthermore, the base includes the lead screw tailstock, the lead screw tailstock is fixed in the one end that the riser was kept away from to the base, the lead screw tailstock is connected with the lead screw is kept away from the one end rotation of following the driving wheel.
Further, the motor support is provided with a long round hole.
Further, still include belt adjusting device, belt adjusting device including fix the kicking block seat on the riser and with kicking block seat threaded connection's adjusting bolt, adjusting bolt's tip can butt motor support.
Further, the fixing device and the mounting seat are fixed on the detection platform, and the upper plane of the detection platform is parallel to the horizontal plane.
Furthermore, the device also comprises a detection device, and the detection device is used for detecting the displacement of the surface of the piece to be detected.
The utility model has the advantages that:
belt drive adopts belt drive, the action wheel diameter is less than and can play the effect of speed reduction from the driving wheel, and then improve the moment of torsion through reducing the rotational speed, make to drive the lead screw better from the driving wheel and rotate, the belt has good flexibility, can alleviate the impact, absorb the vibration that produces in the test procedure, belt drive maintains easily, spare part replacement cost is low, advantages such as smooth operation has simultaneously, noiselessness, screw nut transmission adopts ball screw pair, it is efficient to have a transmission, advantages such as positioning accuracy height and long service life, contact area through flange axle increase and the piece that awaits measuring is in order to exert load to the piece that awaits measuring better, the flange axle can be dismantled, be convenient for maintain and change, above-mentioned each partial coupling makes the utility model discloses reliable and stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic view of a partial structure of a fatigue strength testing apparatus disclosed in the present invention;
fig. 2 is a first schematic structural diagram of a fatigue strength testing apparatus according to an embodiment 1 of the present disclosure;
fig. 3 is a schematic structural diagram of a fatigue strength testing apparatus according to embodiment 1 of the present invention;
FIG. 4 is a front view of FIG. 1;
fig. 5 is a schematic partial structural diagram of a fatigue strength testing apparatus according to embodiment 1 of the present disclosure;
fig. 6 is a schematic partial structural view of a fatigue strength testing apparatus according to embodiment 2 of the present disclosure;
fig. 7 is a schematic structural diagram of a fatigue strength testing apparatus according to embodiment 2 of the present disclosure;
fig. 8 is a schematic structural diagram of a detection device of a fatigue strength testing device disclosed in the present invention;
in the figure: 1. the device comprises a mounting base, 1-1, a motor support, 1-1-1, a long circular hole, 1-2, a vertical plate, 1-3, a base, 1-3-1, a screw tail base, 2, a fixing device, 2-1, a first support frame, 2-2, a second support frame, 2-3, a support base, 2-4, a base plate, 2-5, a pressing plate, 3, a driving motor, 4, a belt transmission device, 4-1, a driving wheel, 4-2, a driven wheel, 4-3, a belt, 5, a screw nut transmission device, 5-1, a transmission screw nut base, 5-2, a screw, 6, a guide mechanism, 6-1, a guide rail, 6-1-1, a guide rail pressing block, 6-2, a sliding block, 7, a loading device, 7-1, a push-pull force meter, 7-2, a transmission screw, 7-3, a flange shaft, 8, a detection platform, 9-1, a top block base, 9-2, an adjusting bolt, 10, a detection device, 10-1, a detection head, 10-2, an inductance gauge, a sliding block, a sliding nut, a sliding block, a shell nut, a cushion base, a cushion frame and a base.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
The present embodiment provides a fatigue strength testing apparatus, as shown in fig. 2 and 3, including: the device comprises a mounting seat 1, a driving motor 3, a belt transmission device 4, a lead screw nut transmission device 5, a loading device 7 and a fixing device 2 for fixing a piece to be tested, wherein in the embodiment, the piece to be tested is a ram A;
as shown in fig. 1, the mounting base 1 includes a motor support 1-1, a vertical plate 1-2 and a base 1-3, the two ends of the vertical plate 1-2 are respectively provided with the motor support 1-1 and the base 1-3, and the motor support 1-1 and the base 1-3 are respectively fixed on the two sides of the vertical plate 1-2 through bolts;
as shown in fig. 1 and 4, the belt transmission device 4 includes a driving wheel 4-1 and a driven wheel 4-2 with a diameter larger than that of the driving wheel 4-1, and the driving wheel 4-1 drives the driven wheel 4-2 to move through a belt 4-3;
the driving motor 3 is arranged on the motor support 1-1 through a bolt, and an output shaft of the driving motor 3 is fixedly connected with a driving wheel 4-1 of the belt transmission device 4;
as shown in fig. 4, the lead screw nut transmission device 5 includes a lead screw 5-2 and a transmission lead screw nut seat 5-1 installed on the lead screw 5-2, one end of the lead screw 5-2 is fixedly connected with a driven wheel 4-2, one end of the lead screw 5-2 close to the driven wheel 4-2 is rotatably connected with a vertical plate 1-2, and the other end of the lead screw 5-2 is rotatably connected with a base 1-3;
as shown in fig. 1 and 5, the loading device 7 includes a push-pull dynamometer 7-1, a transmission screw 7-2 and a flange shaft 7-3, one end of the push-pull dynamometer 7-1 is fixedly connected with the transmission screw nut seat 5-1, the other end of the push-pull dynamometer 7-1 is connected with the transmission screw 7-2 through a thread, one end of the transmission screw 7-2 far away from the push-pull dynamometer 7-1 is connected with the flange shaft 7-3 through a thread, and the flange shaft 7-3 is connected with the ram a through a bolt;
the ram A is fixed by a fixing device 2, an output shaft of a driving motor 3 drives a driving wheel 4-1 of a belt transmission device 4 to rotate, the driving wheel 4-1 drives a driven wheel 4-2 to rotate through a belt 4-3, the rotating speed of the driving motor 3 is high, the diameter of the driving wheel 4-1 is smaller than that of the driven wheel 4-2, the speed can be reduced, torque is improved by reducing the rotating speed, the driven wheel 4-2 can better drive a lead screw 5-2 to rotate, the driving motor 3 rotates forwards and backwards, a transmission lead screw nut seat 5-1 reciprocates along the lead screw 5-2, alternating load is applied to the ram A through a push-pull force gauge 7-1 and a flange shaft 7-3, an operator confirms the current applied force according to the reading of the push-pull force gauge 7-1, the frequency of forward rotation and reverse rotation exchange of the driving motor 3 is adjusted according to the current applied force, and the feeding amount of the transmission lead screw nut seat 5-1 reciprocating along the lead screw 5-2 is controlled to adjust the applied force;
belt drive 4 adopts the belt drive, has advantages such as smooth operation, noiselessness, and screw nut drive 5 adopts the ball screw pair, has advantages such as transmission efficiency height, positioning accuracy height and long service life, increases through flange axle 7-3 and ram A's area of contact in order to exert load to ram A better, and flange axle 7-3 detachable design makes things convenient for flange axle 7-3's maintenance and change, above-mentioned each partial coupling messenger the utility model discloses reliable and stable.
In a specific embodiment, as shown in fig. 2, the fixing device 2 comprises a backing plate 2-4, a pressing plate 2-5 and a supporting base 2-3 for placing the ram a;
the pressing plate 2-5 is placed at the top of the outer edge of the ram A, the backing plate 2-4 is placed on the side face of the outer edge of the ram A, the thickness of the backing plate 2-4 is smaller than that of the outer edge of the ram A, and bolts can penetrate through the pressing plate 2-5 and the backing plate 2-4 in sequence to fix the pressing plate 2-5 and the backing plate 2-4 on the supporting base 2-3; the influence on the measurement precision of the subsequent deformation caused by the overall displacement of the ram A after being stressed is avoided.
In a specific embodiment, as shown in fig. 2, the device further comprises a guiding mechanism 6, as shown in fig. 1, the guiding mechanism 6 comprises a guide rail 6-1 and a sliding block 6-2, the guide rail 6-1 is fixedly connected with the base 1-3, the guide rail 6-1 is parallel to the axis of the lead screw 5-2, the sliding block 6-2 is fixedly connected with the transmission lead screw nut seat 5-1, and the sliding block 6-2 can slide along the guide rail 6-1, so that the transmission lead screw nut seat 5-1 can smoothly reciprocate along the lead screw 5-2.
In a specific embodiment, as shown in fig. 5, a guide rail pressing block 6-1-1 is arranged on the guide rail 6-1, and the guide rail pressing block 6-1-1 is connected with the base 1-3 through a bolt, so that the guide rail 6-1 can be installed and replaced conveniently.
In a specific embodiment, as shown in fig. 4, the base 1-3 includes a screw tail seat 1-3-1, the screw tail seat 1-3-1 is installed at one end of the base 1-3 far from the vertical plate 1-2 through a bolt, and the screw tail seat 1-3-1 is rotatably connected with one end of the screw 5-2 far from the driven wheel 4-2.
In a specific embodiment, as shown in fig. 1, the motor support 1-1 is provided with a long circular hole 1-1-1, and the long circular hole 1-1-1 enables the motor support 1-1 to change the relative position of the motor support on the vertical plate 1-2, so as to adjust the position of the output shaft of the driving motor 3, and further adjust the distance between the driving wheel 4-1 and the driven wheel 4-2, thereby adjusting the tightness of the belt 4-3.
In a specific embodiment, the device further comprises a belt adjusting device, as shown in fig. 4, the belt adjusting device comprises a top block seat 9-1 fixed on the vertical plate 1-2 and an adjusting bolt 9-2 in threaded connection with the top block seat 9-1, and the end of the adjusting bolt 9-2 can abut against the motor support 1-1;
when the motor support 1-1 needs to be adjusted, a bolt which is combined in the long circular hole 1-1-1 is loosened, the adjusting bolt 9-2 is rotated to change the position of the adjusting bolt relative to the top block seat 9-1, the end part of the adjusting bolt 9-2 is abutted against the motor support 1-1, the motor support 1-1 can be finely adjusted by rotating the adjusting bolt 9-2, and when the adjustment of the motor support 1-1 is finished, the bolt which is combined in the long circular hole 1-1-1 is screwed again.
In a specific embodiment, as shown in fig. 5, the axis of the lead screw 5-2 is perpendicular to the axis of the flange shaft 7-3, so that the flange shaft 7-3 can apply radial force to the ram a, and the stress condition of the ram a during the operation of the spindle of the machine tool is simulated.
In a particular embodiment, as shown in fig. 3, the fixture 2 and the bases 1-3 are fixed to a detection platform 8, the upper plane of the detection platform 8 being parallel to the horizontal plane.
In a specific embodiment, the ram fatigue testing device further comprises a detecting device 10, as shown in fig. 8, the detecting device 10 is used for detecting the displacement of the surface of the ram a, the detecting device 10 includes an inductance probe 10-1 and a reading table 10-2, the inductance probe 10-1 is mechanically contacted with the ram a after being fixed by the support structure, the inductance probe 10-1 is preferably a mark inductance probe P2004M, the measuring precision is high, the measuring range is wide, an operator measures the displacement of the surface of the ram a after being stressed by using the inductance probe 10-1, reads the displacement by using the reading table 10-2, and records the displacement in the testing process, so that the change of the displacement of the ram a in the fatigue strength testing process is obtained, and whether the fatigue strength of the ram a reaches the standard is judged according to the change.
Example 2
The working principle and the main structure of the present embodiment are the same as those of embodiment 1, and the present embodiment differs from embodiment 1 in the following points:
in embodiment 1, the object to be measured is a ram a.
In embodiment 1, as shown in fig. 5, the axis of the lead screw 5-2 is perpendicular to the axis of the flange shaft 7-3.
In embodiment 1, as shown in fig. 2, the fixing device 2 comprises a backing plate 2-4, a pressure plate 2-5 and a supporting base 2-3 for placing a ram a;
the pressing plate 2-5 is placed at the top of the outer edge of the ram A, the backing plate 2-4 is placed on the side face of the outer edge of the ram A, the thickness of the backing plate 2-4 is smaller than that of the outer edge of the ram A, and bolts can penetrate through the pressing plate 2-5 and the backing plate 2-4 in sequence to fix the pressing plate 2-5 and the backing plate 2-4 on the supporting base 2-3.
In example 1, the bases 1 to 3 are directly fixed to the detection platform 8.
In example 1, the detection device 10 is used to measure the fatigue strength of the end face of the ram a.
In this embodiment, as shown in fig. 7, the piece to be tested is divided into two parts, one part is a ram a, the other part is a screw nut housing B assembled on the ram a, a nut housing is assembled on the screw nut housing B, the nut housing cooperates with a ball screw of a machine tool to drive the ram a to reciprocate, and a joint between the ram a and the screw nut housing B of the machine tool is a weak part in the machine tool.
In the embodiment, the axis of the screw 5-2 is parallel to the axis of the flange shaft 7-3, and the position of the flange shaft 7-3 is as shown in fig. 6, so that the flange shaft 7-3 can apply an axial force to the screw nut housing B, and the stress condition of the screw nut housing B along the ball screw of the machine tool during working can be simulated.
In the embodiment, as shown in fig. 7, the fixing device 2 includes a first support frame 2-1 and a second support frame 2-2 respectively disposed at two ends of the ram a equipped with the screw nut housing B, the first support frame 2-1 and the second support frame 2-2 are fixedly connected with the detection platform 8, and the first support frame 2-1 and the second support frame 2-2 are connected with the ram a equipped with the screw nut housing B through bolts; the situation that the ram A is driven to integrally move after the screw nut shell seat B is stressed to influence the measurement precision of the subsequent deformation is avoided.
In this embodiment, in order to facilitate alignment of the flange shaft 7-3 with the lead screw nut housing B, as shown in fig. 7, a cushion C is disposed between the base 1-3 and the detection platform 8, and two ends of the cushion C are fixedly connected with the base 1-3 and the detection platform 8, respectively.
In this embodiment, the detecting device 10 is configured to measure a displacement amount of a surface of a joint of the lead screw nut shell base B and the ram a, an operator measures a displacement amount of a surface of a joint of the lead screw nut shell base B and the ram a after being subjected to a force by using the electric sensing head 10-1, reads the displacement amount by using the reading meter 10-2, and records the displacement amount in a testing process, so as to obtain a change of the displacement amount in a fatigue strength testing process of the joint of the lead screw nut shell base B and the ram a, and thereby determine whether the fatigue strength of the joint of the lead screw nut shell base B and the ram a reaches the standard.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.
Claims (10)
1. A fatigue strength testing apparatus, comprising: the device comprises a mounting seat (1), a driving motor (3), a belt transmission device (4), a lead screw nut transmission device (5), a loading device (7) and a fixing device (2) for fixing a piece to be tested;
the belt transmission device (4) comprises a driving wheel (4-1) and a driven wheel (4-2) with the diameter larger than that of the driving wheel (4-1), and the driving wheel (4-1) drives the driven wheel (4-2) to move through a belt;
the driving motor (3) is arranged on the mounting seat (1), and an output shaft of the driving motor (3) is fixedly connected with the driving wheel (4-1);
the screw nut transmission device (5) comprises a screw (5-2) arranged on the mounting base (1) and a transmission screw nut base (5-1) arranged on the screw (5-2), and one end of the screw (5-2) is fixedly connected with the driven wheel (4-2);
the loading device (7) comprises a push-pull force meter (7-1) and a flange shaft (7-3), one end of the push-pull force meter (7-1) is fixedly connected with a transmission screw nut seat (5-1), the other end of the push-pull force meter (7-1) is detachably connected with the flange shaft (7-3), and the flange shaft (7-3) is detachably connected with a to-be-tested piece.
2. A fatigue strength testing device according to claim 1, wherein the axis of the screw (5-2) is parallel to the axis of the flange shaft (7-3).
3. A fatigue strength testing device according to claim 1, wherein the axis of the screw (5-2) is perpendicular to the axis of the flange shaft (7-3).
4. A fatigue strength testing device according to claim 1, further comprising a guiding mechanism (6), wherein the guiding mechanism (6) comprises a guide rail (6-1) and a sliding block (6-2), the guide rail (6-1) is fixedly connected with the mounting base (1), the guide rail (6-1) is parallel to the axis of the screw (5-2), the sliding block (6-2) is fixedly connected with the nut base (5-1) of the transmission screw, and the sliding block (6-2) can slide along the guide rail (6-1).
5. The fatigue strength testing device according to claim 1, wherein the mounting base (1) comprises a motor support (1-1), a vertical plate (1-2) and a base (1-3), and the motor support (1-1) and the base (1-3) are respectively fixed on two sides of the vertical plate (1-2);
the driving motor (3) is fixed on the motor support (1-1);
one end of the screw rod (5-2) close to the driven wheel (4-2) is rotatably connected with the vertical plate (1-2), and the other end of the screw rod (5-2) is rotatably connected with the base (1-3).
6. The fatigue strength testing device according to claim 5, wherein the base (1-3) comprises a screw tail seat (1-3-1), the screw tail seat (1-3-1) is fixed at one end of the base (1-3) far away from the vertical plate (1-2), and the screw tail seat (1-3-1) is rotatably connected with one end of the screw (5-2) far away from the driven wheel (4-2).
7. A fatigue strength testing device according to claim 5, wherein the motor support (1-1) is provided with an oblong hole (1-1-1).
8. A fatigue strength testing device according to claim 7, further comprising a belt adjusting device, wherein the belt adjusting device comprises a top block seat (9-1) fixed on the vertical plate (1-2) and an adjusting bolt (9-2) in threaded connection with the top block seat (9-1), and the end of the adjusting bolt (9-2) can abut against the motor support (1-1).
9. A fatigue strength testing device according to claim 1, wherein the fixing device (2) and the mounting seat (1) are fixed on a detection platform (8), and the upper plane of the detection platform (8) is parallel to the horizontal plane.
10. A fatigue strength testing apparatus according to claim 1, further comprising a detecting device (10), wherein said detecting device (10) is used for detecting the displacement of the surface of the object to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202223186830.7U CN218847603U (en) | 2022-11-29 | 2022-11-29 | Fatigue strength's testing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223186830.7U CN218847603U (en) | 2022-11-29 | 2022-11-29 | Fatigue strength's testing arrangement |
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| CN218847603U true CN218847603U (en) | 2023-04-11 |
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| CN202223186830.7U Active CN218847603U (en) | 2022-11-29 | 2022-11-29 | Fatigue strength's testing arrangement |
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