CN202502021U

CN202502021U - Fatigue testing machine

Info

Publication number: CN202502021U
Application number: CN2012200168297U
Authority: CN
Inventors: 谢毅
Original assignee: Zhejiang Gongshang University
Current assignee: Zhejiang Gongshang University
Priority date: 2012-01-14
Filing date: 2012-01-14
Publication date: 2012-10-24
Anticipated expiration: 2022-01-14

Abstract

The utility model discloses a fatigue testing machine. The fatigue testing machine comprises a fixed pulley I (3), a fixed pulley II (5) and a tension sensor I (4) which are arranged above a piece (1) to be tested and a fixed pulley III (7), a fixed pulley IV (9) and a tension sensor II (8) which are arranged below the piece (1) to be tested. One end of a rope I (2) is fixedly connected with the upper surface of the piece (1) to be tested; and the other end of the rope I (2) sequentially bypasses the fixed pulley I (3), the tension sensor I (4) and the fixed pulley II (5), and then is connected with a disk (6). One end of a rope II (10) is fixedly connected with the lower surface of the piece (1) to be tested; and the other end of the rope II (10) sequentially bypasses the fixed pulley IV (9), the tension sensor II (8) and the fixed pulley III (7), and then is connected with the disk (6). The fatigue testing machine can test loading force accurately.

Description

Fatigue tester

Technical field

The utility model relates to a kind of fatigue tester, particularly a kind of fatigue tester that adopts tension pick-up and rope to load.

Background technology

Present existing fatigue tester generally adopts load maintainer, and the output shaft of load maintainer (pneumatic, hydraulic pressure or motor etc.) connects sensor, is connected on the test specimen through frock clamp again.As shown in Figure 1: on the cylinder piston 200 of cylinder 100, be provided with force transducer 300 and sectional fixture 400, test specimen 1 can be fixed in sectional fixture 400.

This fatigue tester exists following technical matters:

Existing problems 1:

Because test specimen 1 produces distortion in the torture test process; Deformation direction and power loading direction can not be overlapping fully, and in the torture test process, deflection can progressively increase; Direction and direction of motion that this distortion causes loading are inconsistent; Understand the measured value of influence power sensor 300 on the one hand for force transducer 300, the more important thing is to cause force transducer 300 to reduce serviceable life greatly, when test specimen 1 is done torture test because of bearing side force; Force transducer 300 is also being done torture test, and is therefore very high to the life requirements of force transducer 300.

Existing problems 2:

In the torture test process; Force transducer 300 is followed test specimen 1 and is done accelerated motion together; Because force transducer 300 itself has certain quality; Force transducer 300 detected power values are power values that load maintainer affacts force transducer 300 surface, and when affacting test specimen 1 through force transducer 300, and the power value that test specimen 1 bears also comprises because of the quality of correspondences such as force transducer 300 and sectional fixture 400 does the inertia force influence that accelerated motion brings.The actual loaded that often causes this inertial force arrives the acting force and the displayed value grave fault of test specimen 1.

Summary of the invention

The technical matters that the utility model will solve provides a kind of rope that utilizes and loads, and adopts tension pick-up accurately to measure the fatigue tester of loading force.

In order to solve the problems of the technologies described above, the utility model provides a kind of fatigue tester, comprises fixed pulley I, fixed pulley II and tension pick-up I that is positioned at the test specimen top and fixed pulley III, fixed pulley IV and the tension pick-up II that is positioned at the test specimen below;

The end of rope I and the upper surface of test specimen are fixedly linked, and the other end of rope I links to each other with disk after walking around fixed pulley I, tension pick-up I and fixed pulley II successively;

The end of rope II and the lower surface of test specimen are fixedly linked, and the other end of rope II links to each other with disk after walking around fixed pulley IV, tension pick-up II and fixed pulley III successively.

Improvement as the fatigue tester of the utility model: fixed pulley I, fixed pulley II and tension pick-up I are positioned at sustained height, and fixed pulley III, fixed pulley IV and tension pick-up II are positioned at sustained height.

Further improvement as the fatigue tester of the utility model: fixed pulley IV be positioned at fixed pulley I under, fixed pulley III be positioned at fixed pulley II under.

Further improvement as the fatigue tester of the utility model: fixed pulley I, fixed pulley II, fixed pulley III and fixed pulley IV all adopt air bearing.

The fatigue tester of the utility model exists following three innovative points:

Innovative point one:

Adopt rope to connect test specimen, application point respectively connects a rope about test specimen, utilizes rope is applied power, thereby affact the load(ing) point of test specimen.Advantage: simple in structure, there is not complicated connection frock clamp, the influence of no additional mass.

Innovative point two:

Adopt tension pick-up to replace common force transducer.Tension pick-up passes through to detect cord tension, thereby learns the pulling force that acts on the test specimen.In test process, therefore rope motion and tension pick-up does not move does not exist the influence of sensor inertial force to test specimen.The measured value of tension pick-up directly equals to be loaded into the pulling force on the test specimen.

Innovative point three:

In order to realize drawing, press the power of both direction to load, both direction is respectively installed a rope loading about the test specimen application point.2 ropes are connected on the disk through 2 fixed pulleys of correspondence respectively, just realize during the disk rotating that a rope is made to receive rope to be handled, and handles and another root rope is put rope; Thereby make a rope stretch stressed, and another root rope loosen not have and bear pulling force.And adopt two tension pick-ups, test the rope tension of both direction respectively.Up the tension pick-up of force direction is installed between two fixed pulleys above the test specimen; In like manner; Down the tension pick-up of force direction is installed between two fixed pulleys below the test specimen; The advantage of installing like this is: test specimen and rope are done any motion in the no matter torture test process, and the position of four fixed pulleys can not change, so tension pick-up only bears the tension force of rope; Its action direction does not change; Do not bear other additional power yet, the displayed value of each tension pick-up and act on the friction force that only has a fixed pulley between tension pick-up and test specimen between the power on the test specimen through rope, this value can be ignored for torture test power value usually; Tangible measuring accuracy is demanding, thereby can adopt air bearing to replace the reduce friction influence of power of plain bearing.

Description of drawings

Below in conjunction with accompanying drawing the embodiment of the utility model is done further explain.

Fig. 1 is the structural representation of the existing fatigue tester that loads with cylinder,

Fig. 2 is the employing tension pick-up of the utility model and the structural representation of the fatigue tester that rope loads.

Embodiment

Fig. 2 has provided a kind of fatigue tester, comprises fixed pulley I3, fixed pulley II5 and the tension pick-up I 4 and the fixed pulley III7 that is positioned at test specimen 1 below, fixed pulley IV9 and the tension pick-up II8 that are positioned at test specimen 1 top; Fixed pulley I3, fixed pulley II5 and tension pick-up I4 are positioned at sustained height, and fixed pulley III7, fixed pulley IV9 and tension pick-up II8 also are positioned at sustained height; In order to ensure the accuracy that detects data, fixed pulley I3, fixed pulley II5, fixed pulley III7 and fixed pulley IV9 are the fixed pulley that adopts air bearing.

Between fixed pulley I3 and fixed pulley II5, tension pick-up I4 is set, tension pick-up II8 is set at fixed pulley III7 and fixed pulley IV9.

The end of rope I2 and the upper surface of test specimen 1 are fixedly linked, and the other end of rope I2 links to each other with disk 6 after walking around fixed pulley I3, tension pick-up I4 and fixed pulley II5 successively; Disk 6 plays the effect to rope I2 retractable rope.

The end of rope II10 and the lower surface of test specimen 1 are fixedly linked, and the other end of rope II10 links to each other with disk 6 after walking around fixed pulley IV9, tension pick-up II8 and fixed pulley III7 successively; In like manner, disk 6 plays the effect to rope II10 retractable rope.

The tie point of rope II10 and test specimen 1 be positioned at rope I2 and test specimen 1 tie point under; Fixed pulley IV9 be positioned at fixed pulley I3 under; Fixed pulley III7 be positioned at fixed pulley II5 under, tension pick-up II8 be positioned at tension pick-up I4 under.

During actual the use, the left end of test specimen 1 is fixed on the operator's console, and the end of rope I2 and test specimen 1 are fixedly linked near the upper surface of its right-hand member, and in like manner, the end of rope II10 and test specimen 1 are fixedly linked near the lower surface of its right-hand member.Disk 6 is rotatedly connected with operator's console, that is, disk 6 can rotate with respect to operator's console, and disk 6 connects mechanism's realization loadings such as motor.Fixed pulley I3, fixed pulley II5, tension pick-up I4, fixed pulley III7, fixed pulley IV9 and tension pick-up II8 all are located on the operator's console.

When motor just changeed, disk 6 turned clockwise, and 6 couples of rope I2 of disk make to receive rope and handle, and rope II10 is put rope handle; Thereby make rope I2 tension stressed, rope II10 loosens nothing and bears pulling force.At this moment, tension pick-up I4 obtains the suffered pulling force of rope I2.

On the contrary, when motor reversed, disk 6 was rotated counterclockwise, and 6 couples of rope II10 of disk make to receive rope and handle, and rope I2 is put rope handle; Thereby make rope II10 tension stressed, rope I2 loosens nothing and bears pulling force.At this moment, tension pick-up II8 obtains the suffered pulling force of rope II10.

Said process hockets, and just can realize test specimen 1 is carried out the detection of torture test.

At last, it is also to be noted that what more than enumerate only is a specific embodiment of the utility model.Obviously, the utility model is not limited to above embodiment, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought the protection domain of the utility model.

Claims

1. fatigue tester is characterized in that: comprise fixed pulley I (3), fixed pulley II (5) and tension pick-up I (4) that is positioned at test specimen (1) top and fixed pulley III (7), fixed pulley IV (9) and the tension pick-up II (8) that is positioned at test specimen (1) below;

The upper surface of the end of rope I (2) and test specimen (1) is fixedly linked, and the other end of rope I (2) is walked around fixed pulley I (3), tension pick-up I (4) and fixed pulley II (5) back successively and linked to each other with disk (6);

The lower surface of the end of rope II (10) and test specimen (1) is fixedly linked, and the other end of rope II (10) is walked around fixed pulley IV (9), tension pick-up II (8) and fixed pulley III (7) back successively and linked to each other with disk (6).

2. fatigue tester according to claim 1 is characterized in that: said fixed pulley I (3), fixed pulley II (5) and tension pick-up I (4) are positioned at sustained height, and said fixed pulley III (7), fixed pulley IV (9) and tension pick-up II (8) are positioned at sustained height.

3. fatigue tester according to claim 2 is characterized in that: said fixed pulley IV (9) be positioned at fixed pulley I (3) under, said fixed pulley III (7) be positioned at fixed pulley II (5) under.

4. according to claim 1,2 or 3 described fatigue testers, it is characterized in that: said fixed pulley I (3), fixed pulley II (5), fixed pulley III (7) and fixed pulley IV (9) all adopt air bearing.