CN201314884Y - System for measuring the rigidity the arc height of steel plate spring - Google Patents

Abstract

The utility model relates to a system for measuring the rigidity the arc height of a steel plate spring, which is characterized in that the system comprises a horizontal standard station, a pressure rod, a pressure sensor and a displacement sensor, wherein the steel plate spring to be measured is supported on the horizontal standard station through pulleys at two ends; the pressure rod is positioned above the steel plate spring to be measured and arranged in the central position of the steel plate spring to be measured vertically, and can vertically move, and the bottom end thereof can be pressed on the steel plate spring to be measured through a pressure head; the pressure sensor is used for measuring the pressure applied by the pressure rod to the steel plate spring to be measured through the pressure head; and the displacement sensor is used for measuring the displacement of the pressure head relative to the standard station. The system carries out the compensation to the measurement error of the arc height by utilizing the linear relation between the elastic deformation of the steel plate spring and the pressure. The threshold pressure is preset to effectively reduce the zero output error of the sensor and the error of external interference, as well as the error caused by the guide rod, the pressure head, the pressure sensor and the like.

Description

Leaf spring rigidity, camber measuring system

Technical field

The utility model relates to the compensation of leaf spring stiffness measurement and camber measurement, more particularly relates to the measuring system of automobile leaf spring rigidity, camber measurement.

Background technology

Automobile leaf spring is one of main building block of automobile, vehicle frame and axletree flexibly are tied, it mainly acts on is shear force and the moment of transmitting between wheel and vehicle frame, and relaxes the shock load of being passed to vehicle frame by uneven road surface, to guarantee automobile balance ground cruising.Leaf spring is because will bear bigger stress and shock load, therefore need very high yield strength and fatigue strength, and the rigidity of leaf spring and zero load camber are to weigh the important parameter of yield strength and fatigue strength, therefore accurately measure leaf spring rigidity and camber and become very important.In the automobile actual travel, leaf spring is to be operated in below the rated load, and the deflection of its stress and camber is linear, need draw spring rate and camber accurately by measuring computation optimization.

In the prior art, to the rigidity and the camber of leaf spring, domestic a lot of enterprises adopt computer control, and combined sensor, hydraulic system are carried out intelligent measuring to leaf spring.But in the middle of these intelligent measure equipment, a kind of equipment can only be measured a kind of leaf spring of model, and versatility is bad.In the measurement, just read rigidity and the camber that several force value points are estimated leaf spring by pressure transducer usually, this makes and is difficult to accurately measure owing to reasons such as systematic error cause the zero load camber.The concrete principal element that influences measuring accuracy comprises:

1, the load that automobile leaf spring bore is very big, therefore the range of the pressure transducer of selecting for use is just bigger, transducer range has greatly just caused the sensitivity of sensor not high, particularly act on the little leaf spring, when little leaf spring has tangible distortion, and not output of sensor.In addition, itself all has the output error at zero point each sensor, and this causes at actual measurement light plate camber of spring a jerk value at random being arranged, the interference in the external world such as temperature during test, and electromagnetism etc. also have certain influence to the camber measuring accuracy.

2, sensor, pressure head, the guide pole of pressure head and other servicing unit, because the effect of deadweight is arranged, can leaf spring be applied certain load, however sensor rigidly connects when touching because the cause of adjusting play causes sensor can't eliminate described gravity and gap at pressure head and leaf spring.

The utility model content

The utility model is for avoiding above-mentioned existing in prior technology weak point, a kind of leaf spring rigidity, camber measuring system are provided, in the hope of improving the precision that leaf spring rigidity and camber are measured, and can carry out the automobile leaf spring rigidity of multiple model and the measurement of camber, highly versatile, make measurement more convenient, enhance productivity.

The utility model technical solution problem adopts following technical scheme:

The utility model leaf spring rigidity, camber measuring system is characterized in that described measuring system comprises:

One horizontal reference platform, tested leaf spring is supported on the standard station by the coaster at two ends;

One top that is positioned at tested leaf spring, be on the center of tested leaf spring, be the depression bar moving up and down of vertical setting, the bottom of depression bar can apply pressure to tested leaf spring by the effect piece;

One pressure transducer is used to measure depression bar by acting on piece to tested leaf spring applied pressure;

One displacement transducer is used to measure the displacement of the effect piece of pressure head with respect to standard station.

The design feature of the utility model leaf spring rigidity, camber measuring system also is frame is set above standard station, fixedly installs hydraulic cylinder on the frame, and depression bar is the piston rod in the hydraulic cylinder; On frame, the slippage guide rod parallel with piston rod is set, the bottom of slippage guide rod fixedly installs the pressure head support, and the pressure head support slides over the rod end of depression bar with its backboard, and fixedly installs the effect piece with its header board.

Compared with the prior art, the utility model beneficial effect is embodied in:

1, the utility model utilizes the elastic deformation of leaf spring and the linear relationship of pressure that the camber measuring error is compensated.Measuring system is to be power with hydraulic pressure, uses displacement transducer and pressure transducer to measure.The utility model preset threshold pressure can effectively reduce the error of sensor self zero output error and external interference, and the error that causes of deadweights such as guide rod, pressure head and pressure transducer.

2, the utility model adopt the linear segment of elastic curve repeatedly the method that is averaged of value comparatively accurately draw the camber of leaf spring, the leaf spring curve plotting is simply accurate, can serious reality draws the rigidity and the quiescent load camber of leaf spring easily.

3, the utility model method highly versatile goes for the detection to the rigidity and the quiescent load camber of different types of leaf spring.Should be noted that the selection of the range of pressure transducer during test.

Although 4, the actual state influence that is subjected to external interference and the working stability of sensor own of pressure transducer and displacement transducer in the utility model system, the measuring accuracy that has not only improved rigidity and quiescent load camber through reasonable compensation does not need manually-operated simultaneously after leaf spring places, improve automaticity, alleviate working strength of workers.

5, the utility model is simple and compact for structure, good stability, and the reliability height, operation is simple during test, and equipment is easy to safeguard.

Description of drawings

Fig. 1 is a steel plate materials elastic deformation synoptic diagram.

Fig. 2 is the main synoptic diagram of looking for the utility model system is provided with.

Fig. 3 is middle pressure head partial enlarged drawing for the utility model system is provided with.

Fig. 4 is middle side-looking structural representation for the utility model system is provided with.

Fig. 5 is the utility model method light plate camber of spring synoptic diagram.

Fig. 6 is the utility model method light plate spring rate curve map.

Number in the figure: 1 frame, 2 pressure heads, 3 standard stations, 4 hydraulic cylinders, 5 fluid pressure lines, 6 leaf springs, 7 Hydraulic Stations, 8 coasters, 9 header boards, 10 backboards, 11 guide rods, 12 depression bars, 13 pressure transducers, 14 pressure head effect pieces, 15 displacement transducers.

Below pass through embodiment, and the utility model is described in further detail in conjunction with the accompanying drawings.

Embodiment

Referring to Fig. 2, the measuring system in the present embodiment constitutes:

One horizontal reference platform 3, tested leaf spring 6 is supported on the standard station 3 by the coaster 8 at two ends;

One top that is positioned at tested leaf spring 6, be on the center of tested leaf spring 6, be the depression bar moving up and down 12 of vertical setting, the bottom of depression bar 12 can apply pressure to tested leaf spring by the effect piece 14 on the pressure head 2;

One pressure transducer 13 is used to measure depression bar 12 by acting on piece 14 to tested leaf spring 6 applied pressures;

One displacement transducer 15 is used for measurement effect piece 14 displacements with respect to O1 at zero point.

In concrete the enforcement, as Fig. 2, Fig. 3, shown in Figure 4, frame 1 is set above standard station 3, fixedly installs hydraulic cylinder 4 on the frame 1, depression bar 12 is the piston rod in the hydraulic cylinder 4; On frame 1, the slippage guide rod 11 parallel with piston rod is set, the bottom of slippage guide rod 11 fixedly installs the pressure head support, and the pressure head support slides over the rod end of depression bar 12 with its backboard 10, and fixedly installs action head 14 with its header board 9.

Shown in Figure 1, in the regime of elastic deformation of steel plate, the stress and the stress deformation of leaf spring are linear, and linear segment as shown in Figure 1.

Measuring process:

1, pressure head 2 be suspended in leaf spring vertically the stand of top be 0. 01,01 to be H from demarcating with the daylight opening DLO of standard station 3; The threshold pressure G1 of default 50KN in the process of leaf spring 6 stress deformations; Coaster 8 symmetries are placed on the standard station, and the two ends of leaf spring 6 are placed on the coaster 8, and the distance of the center pit of mark coaster 8 and standard station 3 is R; The center line of the position assurance leaf spring 6 of manual adjustment coaster and the center line of pressure head 2 are point-blank; Select the pressure transducer 13 of suitable range and be placed on pressure head 2 and depression bar 12 between.

2, start computer control system, Hydraulic Station 7 provides hydraulic oil for hydraulic cylinder 4, drives pressure head 2 and moves at vertical direction.Pressure head 2 presses down, reach threshold pressure, guarantee that pressure transducer fully contacts with header board 9, leaf spring 6 and dolly 8, pressure head stops to press down and raising certain height, allow the leaf spring state that affranchises, fine setting coaster position, the center line of the position assurance leaf spring 6 of coaster and the center line of pressure head 2 are point-blank; Press down the height H of the top relative zero of opening entry arc when force value reaches threshold pressure then ₁With threshold pressure G ₁, till rated load Ge, the every variation of leaf spring 1cm writes down a deflection H _iWith pressure F _iGet the deflection of adjacent two measuring point correspondences and do difference, draw the camber variation delta f of leaf spring _i=F _I+1-F _i, Δ h _i=H _I+1-H _i(i 〉=1).

3, according to pressure in the step 2 and camber change records value, summation:

Ask the merchant: $\stackrel{\‾}{K}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{\Δ}{f}_i}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{\Δ}{h}_i},$ Then K is the rigidity of the leaf spring of asking, i.e. the slope of Fig. 6 cathetus, and this is worth comparatively near actual value.The residing position of leaf spring is with respect to the distance H at zero point during respectively with the zero load of sensor measurement gained ₀, the distance H k of the residing position of leaf spring relative zero when unloaded, the residing position of leaf spring relative zero distance H e substitution formula during rated load: $\mathrm{Hi}\′=\mathrm{Hi}-\frac{G0+G1}{\stackrel{\‾}{K}}$ (G1: threshold pressure, G0: the deadweight of servicing units such as pressure head) (1)

Revise the error that G0 and G1 cause.

Pairing position with respect to zero point be apart from modified value:

$H_0\′=H_0-\frac{G0+G1}{\stackrel{\‾}{K}},\mathrm{Hk}\′=\mathrm{Hk}-\frac{G0+G1}{\stackrel{\‾}{K}},\mathrm{He}\′=\mathrm{He}-\frac{G0+G1}{\stackrel{\‾}{K}}.$

The actual camber of the leaf spring of each measuring point correspondence is: h _i=H-H _i'-R (2);

Compensation value substitution formula (2) later is the camber of the relative sensor zero point of zero load,

Then have: actual leaf spring zero load camber h ₀=H-H ₀'-R;

The unloaded camber h of actual leaf spring _k=H-Hk '-R;

Actual leaf spring rated load camber h _e=H-He '-R;

4, referring to Fig. 5, Fig. 6, on step 3 basis, the cell pressure value Fi of each measuring point is Y-axis and arc plate center and distance H i is an X-axis, (G1+G0 H1) is initial point, Fi, and Hi increases and is the positive dirction of coordinate system between zero point; With (G1+G0 H1) is starting point, get successively point (Gi, Hi), so that (Ge He) is terminal point, curve plotting; Described curve is close to a straight line very much, the K that its slope is promptly top; Through initial point, be slope with K, curve is prolonged round about, make its being projected as on X-axis-(G0+G1), with ((G0+G1),

) do the coordinate system parallel for initial point with above-mentioned coordinate system, be the distance of zero load with corresponding Y coordinate figure then with respect to zero point.Unloaded lotus Gk, the Y coordinate figure of rated load Ge respective coordinates point is the distance of unloaded relative zero, volume carries the distance of relative zero.The result who reflects above-mentioned measurement by curve.

The utility model can reduce the measuring error that measuring error that sensor self and external interference bring and the deadweight of system supplymentary device cause, highly versatile, and control is reliable, the degree of accuracy height.

Claims (2)

1, leaf spring rigidity, camber measuring system is characterized in that described measuring system comprises:

One horizontal reference platform (3), tested leaf spring (6) is supported on the standard station (3) by the coaster (8) at two ends;

One top that is positioned at tested leaf spring (6), be on the center of tested leaf spring (6), be the depression bar moving up and down (12) of vertical setting, the bottom of depression bar (12) can apply pressure to tested leaf spring by the effect piece (14) on the pressure head (2);

One pressure transducer (13) is used to measure depression bar (12) by acting on piece (14) to tested leaf spring (6) applied pressure;

One displacement transducer (15) is used for the displacement of measurement effect piece (14) with respect to O1 at zero point.

2, leaf spring rigidity according to claim 1, camber measuring system is characterized in that in the top of described standard station (3) frame (1) being set, and fixedly install hydraulic cylinder (4) on the frame (1), and described depression bar (12) is the piston rod in the hydraulic cylinder (4); On described frame (1), the slippage guide rod (11) that parallels with described piston rod is set, the bottom of slippage guide rod (11) fixedly installs the pressure head support, and the pressure head support slides over the rod end of depression bar (12) with its backboard (10), and fixedly installs action head (14) with its header board (9).

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