CN103308403B - Communication line fatigue testing machine - Google Patents

Abstract

The invention discloses a communication line fatigue testing machine which is characterized by comprising an output rod and two rotating mechanisms which have the same angular velocity and move reversely, wherein the two rotating mechanisms are respectively provided with a driving pin, the two driving pins are symmetrical about a perpendicular bisector of a connecting line of rotating centers of the two rotating mechanisms, the output rod is provided with a driving track for the two driving pins to do reverse reciprocating motion, and the driving track is parallel to the connecting line of the two rotating centers; the invention has the advantages that the two driving pins reciprocate reversely along the driving track on the output rod, a pair of reverse friction forces are formed by the two driving pins in the direction of the driving track, and a pair of reaction forces are formed on the output rod at the same time, and the two reaction forces are mutually counteracted, so that the action force between the output rod and the positioning track in the vertical direction is theoretically zero, and meanwhile, the positioning track has no torque, thereby effectively reducing the friction loss and the vibration of the output rod in the reciprocating motion process. [ b ]

Description

A kind of connection fatigue tester

Technical field

The present invention relates to a kind of fatigue tester, especially a kind of connection fatigue tester.

Background technology

Fast development along with economy has driven burning the wind of the communications industry, the outward appearance of product, serviceable life, the series of factors such as price comprehensively determine the competitive power of commodity, the onboard data connection of notebook computer and mobile phone needs the bending repeated, and single line material is entwined by several fine rule usually, skin insulated hull wraps up, connection is subject to high-cycle fatigue destruction and causes the fracture of internal single cable or many fine rules to have a strong impact on producing the reliability of Signal transmissions, therefore this kind of connection needs to use HF fatigue testing machine to carry out test fatigue lifetime of high frequency short arc to it, guarantee the bend-resistance ability of product.

The fatigue tester that commercially possession share is larger at present mainly contains hydraulic servo type, electromagnetic type and mechanical type; Wherein hydraulic servo type fatigue tester is a kind of more advanced proving installation, but price is high, and under low frequency operation state, the large cost of power consumption is high; Electromagnetic type torture test unit frequency is high, is mainly used in the performance test of the good material of fatigue behaviour; Mechanical Fatigue Test Machine is applicable to the torture test not high to frequency requirement, and the little cost of power is low.

But the basic system of existing machinery fatigue tester is slider-crank mechanism, as shown in Figure 1, this slider-crank mechanism comprises driven wheel, first swing pinion, connecting rod, slide block and positioning track, connecting rod wherein produces a power F to slide block, this power F component in the horizontal direction makes slide block do straight reciprocating motion along positioning track, but the component of vertical direction can act on the positioning track of slide block both sides, positioning track produces well-distributed pressure to slide block simultaneously, easily cause friction loss, and positioning track also can exist larger torque, therefore this slider-crank mechanism is when carrying out the straight reciprocating motion of high frequency, owing to there is the frictional resistance of high frequency, and produce violent vibration, simultaneously due to the existence of friction loss and vibration, often need to increase mechanical reduction gear between drive motor and driven wheel, this makes the frequency of operation of fatigue tester relatively reduce, and extends test period.

Summary of the invention

The present invention seeks to: not only structure is simple to provide one, and effectively can reduce friction and vibration, realizes the connection fatigue tester of high-frequency reciprocating rectilinear motion.

Technical scheme of the present invention is: a kind of connection fatigue tester, it is characterized in that, comprise take-off lever, and the equal and heterodromous rotating mechanism of two angular velocity, described two rotating mechanisms are respectively equipped with drive pin, and two drive pins are symmetrical about the perpendicular bisector of described two rotating mechanism rotation center lines, described take-off lever is provided with and does reverse reciprocating drive track for two drive pins, and this drive track is parallel with the line of two rotation centers.

Preferably, described two rotating mechanisms are respectively by the first swing pinion of driving gear drives and the second swing pinion by the first swing pinion driving.

Preferably, the tooth radius of described driven wheel is greater than the tooth radius of described first swing pinion and described second swing pinion.

Preferably, described drive track is strip groove or bar hole.

Preferably, described drive pin is provided with a rolling bearing.

Preferably, described take-off lever both sides are provided with positioning track.

Preferably, described take-off lever is T-shaped take-off lever.

Advantage of the present invention is:

1. two drive pins of the present invention do reverse to-and-fro movement along the drive track on take-off lever, two drive pins define a pair reverse friction power on drive track direction, on take-off lever, define a pair reacting force simultaneously, this two reacting force is cancelled out each other, the acting force between take-off lever and positioning track on vertical direction is made to be zero in theory, simultaneously also there is not torque in positioning track, effectively reduces the friction loss of take-off lever in reciprocatory movement and vibration.

2. the present invention drives by the driven wheel that radius is large the first swing pinion speedup that radius is little, the reciprocating frequency of take-off lever is increased, reduces test period.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described:

Fig. 1 is prior art structural representation;

Fig. 2 is structural representation of the present invention;

Wherein: 1 driven wheel, 2 take-off levers, 3 first swing pinions, 4 second swing pinions, 5 drive pins, 6 drive track, 7 positioning tracks, 8 rolling bearings, 9 connecting rods, 10 slide blocks.

Embodiment

Embodiment: with reference to shown in Fig. 2, a kind of connection fatigue tester comprises driven wheel 1, take-off lever 2, the first swing pinion 3 driven by driven wheel 1 and the second swing pinion 4 driven by the first swing pinion 3, first swing pinion 3 and the second swing pinion 4 synchronous backward rotate and radius is equal, and drive pin 5 is symmetrically installed with respectively on the first swing pinion 3 and the second swing pinion 4, take-off lever 2 is provided with and does reverse reciprocating drive track 6 for two drive pins 5, and this drive track 6 is parallel with the rotation center line of the second swing pinion 4 with the first swing pinion 3, drive track 6 on the relative take-off lever 2 of two drive pins 5 of the present invention does reverse to-and-fro movement, two drive pins 5 define a pair reverse friction power on drive track 6 direction, on take-off lever 2, define a pair reacting force simultaneously, this two reacting force is cancelled out each other, thus make the acting force between take-off lever 2 and positioning track 7 on vertical direction be zero in theory, also there is not torque in positioning track 7 simultaneously, effectively reduce the friction loss of take-off lever 2 in reciprocatory movement and vibration.

The tooth radius of driven wheel 1 of the present invention is greater than the tooth radius of the first swing pinion 3 and the second swing pinion 4, the first swing pinion 3 speedup driving radius little by the driven wheel 1 that radius is large, the reciprocating frequency of take-off lever 2 is increased, reduces test period; Drive track 6 is strip groove or bar hole, and drive pin 5 is provided with a rolling bearing 8, and take-off lever 2 both sides are provided with positioning track 7, and this take-off lever 2 is T-shaped take-off lever.

As shown in Figure 2, the radius supposing the first swing pinion 3 and the second swing pinion 4 is r ₂, driven wheel 1 radius is R ₂, rolling bearing 8 is e apart from the gear rotation center distance of its correspondence, and using the centre of form of gear as research reference point, then the connection fatigue tester equation of motion shown in Fig. 2 is:

$x=-e\sin \frac{R_2}{r_2}\mathrm{wt}$

Ask second derivative to it, then acceleration equation is:

$a=e\frac{{R_2}^2}{{r_2}^2}{w}^2\sin \frac{R_2}{r_2}\mathrm{wt}$

In formula, w is the Output speed of motor.

And for the testing machine that slider-crank mechanism as shown in Figure 1 drives, suppose that the radius of the first swing pinion 3 is r ₁, driven wheel 1 radius is R ₁, the rotation center of the first swing pinion 3 is r to the distance of connecting rod 9 and the first swing pinion 3 tie point, and the length of connecting rod 9 is l, its equation of motion and acceleration equation as follows respectively:

$x\≈l[1-{\left(\frac{r}{2l}\right)}^2]+r[\cos \frac{r_1}{R_1}\mathrm{wt}+\frac{r}{4l}\cos \left(2\frac{r_1}{R_1}\mathrm{wt}\right)]$

$a=-r\frac{{r_1}^2}{{r_1}^2}{w}^2[\cos \frac{r_1}{R_1}\mathrm{wt}+\frac{r}{l}+\cos \left(2\frac{r_1}{R_1}\mathrm{wt}\right)]$

By the contrast of two groups of formula, the stroke size of the reciprocal linear motion of connection fatigue tester is 2e, compares, basic simlarity with the stroke 2r of slider-crank mechanism; And acceleration is maximum at extreme position, if e and r is equal, then can see at extreme position, the limit acceleration of slider-crank mechanism is obviously larger.

Connection fatigue tester of the present invention also can be applicable to other to be needed to rotate the mechanical transmission mechanism changed with linear reciprocating motion.

Above embodiment is only the present invention's a kind of embodiment wherein, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (5)

1. a connection fatigue tester, it is characterized in that, comprise take-off lever, and the equal and heterodromous rotating mechanism of two angular velocity, described two rotating mechanisms are respectively equipped with drive pin, and two drive pins are symmetrical about the perpendicular bisector of described two rotating mechanism rotation center lines, described take-off lever is provided with and does reverse reciprocating drive track for two drive pins, and this drive track is parallel with the line of two rotation centers, described two rotating mechanisms are respectively by the first swing pinion of driving gear drives and the second swing pinion by the first swing pinion driving, and the tooth radius of described driven wheel is greater than the tooth radius of described first swing pinion and described second swing pinion.

2. connection fatigue tester according to claim 1, is characterized in that, described drive track is strip groove or bar hole.

3. connection fatigue tester according to claim 1, is characterized in that, described drive pin is provided with a rolling bearing.

4. connection fatigue tester according to claim 1, is characterized in that, described take-off lever both sides are provided with positioning track.

5. connection fatigue tester according to any one of claim 1 to 4, is characterized in that, described take-off lever is T-shaped take-off lever.