JPH05133864A - Life tester of spring - Google Patents

Abstract

PURPOSE:To concurrently perform an expansion/contraction test and a durability test of various kinds or various specifications of tension, compression springs having different conditions of the free length, properties etc. CONSTITUTION:A base end of a crank arm 18 is fixed to the eccentric position of a crank wheel, and a fitting gap of a predetermined distance is formed in the longitudinal direction of the crank arm 18. A cam roller of a fixed roller shaft is loosely fitted in the fitting gap thereby to allow the crank arm 18 to freely sway and move up and down. Slide spring plates 28, 28a are mounted to sliders on guide rails 26, 26a. The cam rollers 29, 29a loosely fitted in the fitting gap are set on the slide spring plates 28, 28a, so that the sliders can slide back and forth. When springs S, S1 are hung between the slide spring plates 28, 28a and the fixed spring plates 33, 33a, respectively, both ends of the springs are held to maintain the length and expanding/contracting stroke agreed with the free length or the like of the springs and the springs of various models can be simultaneously expanded/contracted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring life tester capable of simultaneously performing fatigue and durability tests of springs of various specifications having different free lengths.

[0002]

2. Description of the Related Art Conventionally, a wide variety of extension and compression springs have been used as one component of various machines and appliances. Since such spring is an important component, durability,
Long life and performance maintenance (prevention of deterioration of characteristics) are required, but spring fatigue and durability tests are performed by using a crank wheel to expand and contract in one direction thousands of times and tens of thousands of times. Therefore, when the free length of the spring and other conditions are different, it is impossible to simultaneously test the expansion and contraction of different springs.

[0003]

SUMMARY OF THE INVENTION According to the present invention, there are various types or various specifications having different conditions such as free length, thickness, characteristic tensile length (expansion / contraction amount, deflection amount), spring strength, and elastic force. The purpose of the present invention is to provide a life test machine for springs, in which the tension and compression springs are simultaneously expanded and contracted to perform fatigue and durability tests.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the problem that the expansion and contraction (durability test) of springs of various specifications having different conditions such as free length based on the above-mentioned prior art could not be performed at the same time. The base end of the crank arm is fixed to the eccentric position of the wheel, a fitting gap of a predetermined interval is formed in the longitudinal direction of the crank arm, and a cam roller of a fixed roller shaft is loosely fitted in the fitting gap to swing the crank arm. The slider is vertically movable, and a slide spring plate is provided on the slider on the guide rail fixed to the vertical plate, and a cam roller that is loosely fitted in the fitting gap is mounted on the slide spring plate to reciprocally slide the slider. By fixing the springs on both the slide spring plate and the fixed spring plate, Holding the ends of the spring in the match length and stretch stroke in the manner to scale the spring various specifications simultaneously, it is obtained by solving cents above problems.

[0005]

According to the present invention, the crank arm makes a vertical oscillating compound motion by the rotation of the crank wheel, and the slide spring plate reciprocally slides in response to the compound motion of the crank arm, and Endurance tests are performed by expanding and contracting the springs with both ends hooked to the fixed spring plate. Also, the sliding amount of the multiple slide spring plates (spring expansion and contraction strokes) is different, and the distance between the slide spring plate and fixed spring plate is set. This allows the springs of various specifications to expand and contract at the same time.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a test machine for simultaneously performing fatigue and durability tests of springs S, S1 ... Of various specifications having different conditions such as free length, A vertical plate 3 is erected via a base plate 2, a motor 4 is attached to a lower central portion of the vertical plate 3, and a vertical pitch is provided in a vertical line in the central portion of the vertical plate 3 which is located above the motor 4. Are provided with a plurality of mounting screw holes 5, 5a ... And a pair of L-shaped guide rail pressing plates 6, 6a are fixedly provided on both sides of the vertical plate 3.

Reference numeral 7 denotes a rotatable crank wheel fixed to a motor shaft 8. A T-slot 9 is formed in the central diametrical direction of the front surface of the crank-wheel 7, and the crank-wheel 7 is formed in a direction perpendicular to both ends of the T-spot 9. A pair of adjusting boards 10 and 10a are attached to the circumferential ends of, and the adjusting screws 11 are fixed so that both ends of the adjusting boards 10 and 10a are fixed in the T groove 9.

In the embodiment, the motor 4 is mounted on the front surface of the vertical plate 3, but if the motor 4 is installed on the back surface of the vertical plate 3 and the crank wheel 7 is rotated via a flywheel or the like, the crank It is also possible to easily adjust the adjusting screw 11 and the like on the wheel 7.

Reference numeral 12 is a connecting rod mounted at an eccentric position of the crank wheel 7. A T-shaped projection 13 which is internally slidable inside the T groove 9 is formed at a base end portion of the connecting rod 12, The adjusting screw hole 14 into which the adjusting screw 11 is screwed is formed by threading on the protruding portion 13, and the tip end of the connecting rod 12 is formed as a mounting portion 15 provided with a screw portion, and the rod end 16 is attached to the mounting portion 15. The insert end 17 (universal joint), which is spherical and swingable, is attached at the base end of.

Reference numeral 18 is a crank arm. The crank arm 18 comprises a pair of parallel rectangular members 20 and 20a having fitting gaps 19 at predetermined intervals in the longitudinal direction, fixed at both ends by interval holding plates 21 and 21a. A mounting screw hole 22 is threaded into the spacing plate 21 on the base end side to fix the tip screw portion 23 of the rod end 16, and the fixing screw shaft 5, 5a, etc. of the vertical plate 3 is fixed to one place.
24 (fixed fulcrum) is fixed and the fixed roller shaft 24
A cam roller 25 is attached to the tip of the cam roller 25, and the cam roller 25 is loosely fitted so as to be positioned in the fitting gap 19 of the crank arm 18.

Reference numerals 26, 26a are a plurality of guide rails fixed at a predetermined pitch in the vertical direction in the horizontal direction of the front surface of the vertical plate 3, and both ends of the guide rails 26, 26a ... , 6a are pressed and fixed, and sliders 27, 27a are installed on the respective guide rails 26, 26a so as to be slidable in the horizontal direction, and the set positions of the guide rails 26, 26a in the vertical direction are The guide rails 6 and 6a can be adjusted by attaching and detaching the guide rails.

28, 28a are slide spring plates fixed on sliders 27, 27a, and cam rollers 29, 29a are provided on the upper center of the slide spring plates 28, 28a.
Are fixed so as to be loosely fitted in the fitting gap 19 of the crank arm 18, and the cam rollers 29, 29a ... serve as fulcrums, and three springs are provided at each end of the slide spring plates 28, 28a. Latching pins 30, 30a ... are erected.

31a, 31a ... Are slide spring plates 28, 28.
The guide rails are slidably installed at both ends of the guide rails 26, 26a on both sides of a.
Are fixed to the slide spring plates 28, 28a ... at positions corresponding to the free lengths of the springs S, S1.
Is fixed to the guide rails 26, 26a by the guide rail 3
The fixed spring plates 33, 33a, ... Are fixed to the upper portions of 1, 31a .., and three spring retaining pins 34, 34a are erected on the central upper surface of the fixed spring plates 33, 33a. ..

Next, the operation of the spring life tester according to the present invention will be described. The fixed spring plates 33, 33a ... Are guided according to the test conditions such as the free length and characteristics of the springs S, S1. Rail 26, 26
Slide along the a… slide spring plates 28, 28a
... and the fixed spring plates 33, 33a ... are set so as to match the free lengths of the springs S, S1 ..., and the fixed spring plates 33, 33a ... are fixed by the fixing screws 32, 32a ...
Cam rollers 25 and fixed roller shafts 24, which are fixed fulcrums, are fixed to both ends of 26, 26a.
According to the required swinging motion of the crank arm 18,
The vertical rod 3 is fixed to one of the selected mounting screw holes 5, 5a ..., and the connecting rod 12 serves as the base for rotation and swing of the crank arm 18.
The eccentric position of the crank arm 18 is set by the adjusting screw 11 according to the required swinging motion of the crank arm 18, the connecting rod 12 is fixed to a predetermined eccentric position of the crank wheel 7, and the guide rails 26, 26a ... The vertical rail 3 and the vertical rail 3 by setting the guide rail pressing plates 6 and 6a.
a ... is fixed, and the spring lock pin 3 of both the slide spring plates 28, 28a ... and the fixed spring plates 33, 33a ... is attached to the test machine 1 set to meet the test conditions as described above.
0, 30a ..., 34, 34a ... 6 kinds of each type, 3 upper and lower stages corresponding to the respective guide rails 26, 26a ..., and both ends of 3 kinds of springs S, S1 ... of various specifications are hooked. To do.

Therefore, when the motor 4 is driven, since the connecting rod 12 is eccentrically fixed to the crank wheel 7 that rotates, the base end of the crank arm 18 generates a circular motion, and the crank arm 18 has a circular motion. Since the cam roller 25 of the fixed roller shaft 24 is loosely fitted in the fitting gap 19, the movement of the crank arm 18 does not swing laterally at the fixed fulcrum position of the fixed roller shaft 24 but also moves vertically. Arm 18
The distal end of the vertical plate 3 generates a circular motion in the opposite direction to the base end thereof, and the crank arm 18 as a whole swings vertically and vertically.
Simultaneously in the vertical plane along.

With respect to the combined movement of the crank arm 18, the slide spring plates 28, 28a ...
Since it is impossible to move up and down by 26a, the cam rollers 29, 29a of the slide spring plates 28, 28a move relatively up and down within the fitting gap 19 of the crank arm 18, and at that position of the crank arm 18. Only the amplitude motion in the swing motion is interlocked with the sliders 27, 27a, and the slide spring plates 28, 28a ... perform a reciprocating slide motion in the horizontal direction, so that the slide spring plates 28, 28a ... and the fixed spring plates 33, 33a. The intervals of ... fluctuate continuously, and the springs S, S1 ... expand and contract with such a stroke.

Further, as a method for dealing with the free length of the springs S, S1 ... Of various specifications, the fixed spring plates 33, 33
In addition to adjusting the set position of a ..., there is a method of performing with a plurality of slide spring plates 28, 28a ... It can be changed, that is, the crank arm 18 has a different amplitude amount in the vertical direction due to the selection of the installation location of the guide rails 26, 26a ... In the vertical direction, so that the slide spring plates 28, 28a. The sliding momentum changes and the fixed spring plates 33, 33a
The expansion and contraction distance with ... fluctuates.

As another method, the crank arm 18 is oscillated by the eccentric mounting position of the connecting rod 12 on the crank wheel 7 and the mounting position of the fixed roller shaft 24 (fixed fulcrum) fixed to the vertical plate 3 in the vertical direction. The moving angle and the amount of amplitude fluctuate, and in this case also the guide rails 26, 26
a ... and fixed spring plates 33, 33a ... As well as changing the set positions, the reciprocating slide momentum of the slide spring plates 28, 28a ... and the expansion / contraction distances of the springs S, S1. You can select different stretch strokes that fit.

The fatigue of the springs S, S1 ...
The endurance test is performed by, for example, one million times of expansion and contraction, and the number of times of expansion and contraction that the springs S, S1 ... Are broken or broken is recorded on a control panel (not shown), and one guide rail 26,
Since three springs S, S1 ... are left and right with respect to 26a ..., the balance of the expansion / contraction force can be improved.

[0020]

In summary, according to the present invention, the rotatable crank wheel 7 is mounted on the vertical plate 3, the fixed roller shaft 24 equipped with the cam roller 25 is mounted, and the connecting rod 12 is mounted at the eccentric position of the crank wheel 7. Since the base end of the crank arm 18 is fixed to the connecting rod 12 and a fitting gap 19 having a predetermined interval is formed in the longitudinal direction of the crank arm 18, and the cam roller 25 is loosely fitted in the fitting gap 19, the crank arm It enables a complex motion of swinging 18 up and down in a vertical plane along the vertical plate 3, and at the specific point in the vertical direction of the crank arm 18 due to the relationship between the fixed roller shaft 24 and the fulcrum of the connecting rod 12. The amount of swing can be changed, and a plurality of guide rails 26, 26a ... Are fixed to the vertical plate 3 and the guide rails 26, 26a are fixed.
A slider 27, 27a is movably attached to the slider, and a slide spring plate 28, 28a is mounted on the slider 27, 27a.
, And the cam rollers 29, 29a, which are loosely fitted in the fitting gap 19, are mounted on the slide spring plates 28, 28a ,. Therefore, the sliders 27, 27a, ... And the slide spring plates 28, 28a ,. By interlocking with the swinging motion, it can be converted into a reciprocating slide motion in the direction of the guide rails 26, 26a ... And fixed spring plates 33, 33a ... Are attached to both ends of the guide rails 26, 26a. 28, 28a and fixed spring plates 33, 33a are provided with spring retaining pins 30, 30a, 34, 34a, so that the fixed spring plates 33, 33a are fixed in position.
, The springs S, S1 set in the tester 1 can be continuously expanded and contracted, and the amplitude of the sliders 27, 27a ... Because the crank arm 18 and the sliders 27, 27a, ... differ in vertical position, the expansion and contraction strokes of the springs S, S1 ... change, and several kinds of expansion and contraction and durability tests with different amounts of expansion and compression can be performed simultaneously. I can.

Further, since the fixed spring plates 33, 33a ... Can be positionally adjusted and fixed in the direction of the guide rails 26, 26a .., when setting the springs S, S1 .. , Fixed spring plate
It can be set easily just by adjusting the position of 33, 33a.

Further, since the eccentric position of the connecting rod 12 with respect to the rotation center of the crank wheel 7 can be adjusted, and the mounting position of the fixed roller shaft 24 mounted on the vertical plate 3 can be changed, the crank arm 18 Can be changed to change the reciprocating slide amount of the slide spring plates 28, 28a ... Corresponding to the plurality of guide rails 26, 26a .., and various kinds of expansion / contraction conditions can be set.

Further, since the guide rails 26, 26a, ... Are vertically position-adjustable, even if the swing amount of the crank arm 18 is constant, each slide spring plate can be adjusted.
Since the slide amounts of 28, 28a ... Are different, it is possible to set various kinds of expansion / contraction conditions by adjusting the positions of the guide rails 26, 26a.

[Brief description of drawings]

FIG. 1 is a front view of a spring life test machine according to the present invention with a motor removed.

2 is a partial cross-sectional side view of the spring life test machine of FIG. 1. FIG.

FIG. 3 is an explanatory view of a main part showing a swing vertical movement of a crank arm in a spring life tester.

FIG. 4 is an explanatory view of a main part showing swing vertical movement of a crank arm when a setting condition of a fixed roller shaft is changed.

FIG. 5 is an enlarged front view of essential parts showing a state where a spring is hooked.

6 is a sectional view taken along line AA of FIG.

FIG. 7 is a view on arrow B of FIG.

FIG. 8 is an enlarged front view of a crank arm.

FIG. 9 is a front view of a vertical plate.

FIG. 10 is a front view of a crank wheel.

FIG. 11 is a plan view of a crank wheel.

FIG. 12 is a side view of a connecting rod.

13 is a view on arrow C of FIG.

FIG. 14 is a perspective view of a rod end.

[Explanation of symbols]

 3 Vertical plate 7 Crank wheel 12 Connecting rod 18 Crank arm 19 Fitting gap 24 Fixed roller shaft 25 Cam roller 26, 26a… Guide rail 27, 27a… Slider 28, 28a… Slide spring plate 29, 29a… Cam roller 30, 30a… Spring retaining pin 33, 33a… Fixed spring plate 34, 34a… Spring retaining pin

Claims (5)

[Claims] 1. A vertical plate is mounted with a rotatable crank wheel, a fixed roller shaft equipped with a cam roller is mounted, a connecting rod is mounted at an eccentric position of the crank wheel, and a base end of a crank arm is fixed to the connecting rod. Then, a fitting gap having a predetermined interval is formed in the vertical direction of the crank arm, the cam roller is loosely fitted in the fitting gap, and a plurality of guide rails are fixed to the vertical plate and a slider is moved to the guide rail. The slide spring plate is mounted freely, and the slide spring plate is provided on the slider, the cam roller which is loosely fitted in the fitting gap is mounted on the slide spring plate, and the fixed spring plates are mounted on both end portions of the guide rail. A spring retaining pin is provided on both the fixed spring plate and the fixed spring plate. Ring life test machine. 2. A spring life tester according to claim 1, wherein the fixed spring plate is positionally adjustable and fixable in the direction of the guide rail. 3. The spring life test machine according to claim 1, wherein the eccentric position of the connecting rod with respect to the rotation center of the crank wheel is adjustable. 4. The spring life tester according to claim 1, wherein the mounting position of the fixed roller shaft mounted on the vertical plate is changeable. 5. The spring life tester according to claim 1, wherein the guide rail is vertically adjustable in position.