CN201152843Y - Woods material elastic modulus non-destructive checkers - Google Patents

Abstract

The utility model discloses a timber elastic modulus non-destructive testing device, which is divided into two main parts: a structure bearing part and a data acquisition and processing part. The structure bearing part comprises a first bearing base, a second bearing base, a first bracket and a second bracket, wherein, the first bearing base and the second bearing base are used for supporting the timber; the first bearing base consists of a bearing head, a load sensor and a base; the second bearing base consists of a cutting edge, a supporting board and the base. The data acquisition and processing part comprises the load sensor, a signal adjustment box, a data acquisition card and a computer. The testing device has the advantages that pieces to be tested are not damaged, the structure is simple, the detection is convenient and quick, the detection efficiency and the quality are high, and the cost is low.

Description

Modulus of elasticity of wood the cannot-harm-detection device

Technical field

The utility model relates to a kind of material property detecting instrument equipment, particularly a kind of be suitable on the length direction, the timber that is consistent of cross sectional shape and size carries out modulus of elasticity of wood the cannot-harm-detection device that elastic modulus detects.

Background technology

In order to use timber with holding water, must detect its mechanical property, its elastic modulus is one of key index of representing mechanical properties such as its load-bearing capacity.In to timber mechanics performance detection problem, the large size plate, the square bar that use about reality, how to detect their mechanical property be to need a problem solving at present to quick nondestructive.At present the method for testing of timber mechanics performance mainly is to continue to use metalloid material mechanical performance assay method, at special regulation small size test specimen stretch, compress, destructive test such as bending.Minute is long, the most important thing is this material of timber, between the mechanical property between large scale part and special small size test specimen notable difference is arranged.In addition, because the timber natural characteristic, even the mechanical property between the different plates of same seeds, square bar is disperseed also very big.

Therefore existence at present destroys the needs that detect to quick, nothing that every block of sheet material, square bar all carry out mechanical property.

Summary of the invention

The purpose of this utility model provides a kind of modulus of elasticity of wood the cannot-harm-detection device of can quick nondestructive measuring large size plate, square bar elastic modulus.

Above-mentioned purpose of the present utility model is achieved in that a kind of modulus of elasticity of wood the cannot-harm-detection device, comprising:

Be used for supporting first supporting base of timber to be measured;

Be used for supporting second supporting base of timber to be measured;

Be arranged in the load sensor of first supporting base or second supporting base;

The signal process box that connects described load sensor via signal wire;

The data collecting card that connects signal process box; And

The computing machine that is used for calculating modulus of elasticity of wood that connects data collecting card.

Wherein, described first supporting base comprises: first base; Be fixed on the described load sensor on first base; Be fixed on the supporting head that is used for contact measured timber on the described load sensor.

Wherein, described second supporting base comprises: second base; Be fixed on the support plate on second base; The edge of a knife that connects described support plate.The described edge of a knife is preferably the yi word pattern edge of a knife.

Wherein, the described edge of a knife connects described support plate by screw, so that adjust the height of the edge of a knife by screw.

Modulus of elasticity of wood the cannot-harm-detection device of the present utility model also comprises: first support that is threaded with described first supporting base; And second support that is threaded with described second supporting base.

Wherein, described load sensor is a S type tension-compression sensor.

Wherein, described signal process box has a plurality of amplifiers that amplify the signal of being gathered by a plurality of described load sensors respectively.

Wherein, described data collecting card has the A/D converter that the multichannel analog signals that described a plurality of amplifiers of described signal process box are exported converts digital signal respectively to.

Wherein, described data collecting card connects described USB interface of computer by the USB cable.

Wherein, described modulus of elasticity of wood $\mathrm{MOE}={\mathrm{<figure-callout\; id="2"\; label="f\; r"\; filenames="Y20082007873800091.png"\; state="\{\{state\}\}">f</figure-callout>}}_r^{}{\mathrm{WL}}^3/\left(2.47\mathrm{Ig}\right)$ , in formula, fr is the resonant frequency that described load sensor detects, and W is the timber weight that described load sensor detects, and L is a timber length, and I is a timber inertia distance, g is an acceleration of gravity.

Facts have proved of the present utility model having the following advantages:

Under the situation that need not measure deflection, provide modulus of elasticity of wood (E) measurement result accurate, good reproducibility;

Automatically measure timber weight and proportion.

Automatically measure and write down vibration damping and be used for the intensity recurrence.

Storing data automatically becomes data file, makes things convenient for follow-up data to handle.

Compact, be convenient for carrying, can finish the setting before using in several minutes.

Easy to use, succinct.

Below in conjunction with accompanying drawing the utility model is elaborated.

Description of drawings

Fig. 1 is the synoptic diagram that shows the structure support part of modulus of elasticity of wood the cannot-harm-detection device of the present utility model;

Fig. 2 is the synoptic diagram of first supporting base of the present utility model;

Fig. 3 is the synoptic diagram of second supporting base of the present utility model;

Fig. 4 is the synoptic diagram that shows the data acquisition process part of modulus of elasticity of wood the cannot-harm-detection device of the present utility model;

Fig. 5 is the embodiment synoptic diagram of data acquisition process part of the present utility model.

Embodiment

The horizontal free beam vibration principle of basis of the present utility model is measured the resonant frequency of timber behind exciting, and then calculates the elastic modulus of timber.

Modulus of elasticity of wood the cannot-harm-detection device of the present utility model is divided into structure support part and data acquisition process part.

As shown in Figure 1, realize the structure support of the present utility model of timber 5 supportings to be measured and measurement is partly comprised: first supporting base 1 that is used for supporting timber to be measured; Be used for supporting second supporting base 2 of timber 5 to be measured; And the load sensor 7 (at Fig. 1, load sensor 7 is set in first supporting base 1) that is arranged in first supporting base 1 or second supporting base 2.

In order to alleviate the labour intensity of survey crew, promptly standing just can be placed on timber 5 to be measured on first supporting base 1 and second supporting base 2, and structure support part of the present utility model also comprises: first support 3 that is threaded with described first supporting base 1; And second support 4 that is threaded with described second supporting base 2.This first, second support is similar to the A-frame of camera.

As shown in Figure 2, first supporting base 1 comprises: first base 8; Be fixed on the described load sensor 7 on first base 8; Be fixed on the supporting head that is used for contact measured timber 6 on the described load sensor 7.

As shown in Figure 3, second supporting base 2 comprises: second base 11; Be fixed on the support plate 10 on second base 11; The edge of a knife 9 that connects described support plate 10.The edge of a knife 9 is preferably the yi word pattern edge of a knife.

The edge of a knife 9 connects described support plate 10 by screw 15, so that adjust the height of the edge of a knife 9 by adjusting screw 15.

Load sensor 7 of the present utility model is S type tension-compression sensors, the 60001S type tension-compression sensor that can select for use U.S. SENSORTRONICS company to produce.

Data acquisition process partly is used to handle weight signal and the vibration signal that load sensor detects, and according to these two calculated signals modulus of elasticity of wood MOE, the modulus of elasticity of wood of being calculated $\mathrm{MOE}={\mathrm{<figure-callout\; id="2"\; label="f\; r"\; filenames="Y20082007873800091.png"\; state="\{\{state\}\}">f</figure-callout>}}_r^{}{\mathrm{WL}}^3/\left(2.47\mathrm{Ig}\right)$ , wherein, fr is the resonant frequency that is detected by load sensor 7, and W is the timber weight that is detected by load sensor 7, and L is a timber length, and I is a timber inertia distance, g is an acceleration of gravity.

As shown in Figure 4, data acquisition process of the present utility model partly comprises: via the signal process box 12 of signal wire connected load sensor 7; The data collecting card 12 that connects signal process box 12; And the computing machine 14 that is used for calculating modulus of elasticity of wood that connects data collecting card 12.

Data collecting card 13 connects the USB interface of described computing machine 14 by the USB cable.

Signal process box 12 can have a plurality of amplifier 12-1,12-2,12-3, the 12-4 that amplifies the signal of being gathered by a plurality of load sensor 7-1,7-2,7-3,7-4 respectively, referring to Fig. 5.Described load sensor 7-1,7-2,7-3,7-4 are range different load sensors, and they can be provided with in first supporting base 1, can certainly be arranged on as required in the first different supporting bases 1.

Data collecting card 13 can have a plurality of A/D converters that the multichannel analog signals of described a plurality of amplifier outputs of described signal process box 12 converted to digital signal respectively, as selection, can substitute described a plurality of A/D converters (digital to analog converter) with the single output of input more than A/D converter.

Fig. 5 has shown an embodiment of data acquisition process part of the present utility model, as shown in Figure 5, the data acquisition process part can comprise: amplify respectively by a plurality of load sensor 7-1,7-2,7-3, the vibration signal of 7-4 collection and a plurality of signal amplifier 12-1,12-2,12-3, the 12-4 of weight signal; The vibration signal and the weight signal that have amplified are carried out analog-to-digital data collecting card; And to the input digital signal carry out data processing until the computing machine 14 that calculates modulus of elasticity of wood.

Data collecting card of the present utility model can adopt the USB-6008 data collecting card of American National instrument company.Process software of the present utility model can be measured service software DAQmx by LabVIEW and NI and design and develop.

The utility model moves horizontally a support end tripod according to tested wood size, and after placing steadily, test specimen is positioned on the bracing or strutting arrangement, and the extension elongation at wood piece two ends is met the requirements.In the process software interface, fill in the relevant information such as size, seeds, water percentage of test specimen.

Then, in the time of setting,, knock the wood piece middle part, make it produce transverse vibration with suitable dynamics and speed.Software will extract effective vibration signal automatically, carry out analysis of vibration signal, extract relevant information, and the information such as weight that obtain by detection, carry out related data and handle, and carry out a series of follow-up works such as calculating of test specimen dynamic modulus of elasticity and mechanical stress grade classification.The calculating of elastic modulus is finished by following formula: $\mathrm{MOE}={\mathrm{<figure-callout\; id="2"\; label="f\; r"\; filenames="Y20082007873800091.png"\; state="\{\{state\}\}">f</figure-callout>}}_r^{}{\mathrm{WL}}^3/\left(2.47\mathrm{Ig}\right)$ , in the formula, MOE is elastic modulus (Pa), and fr is resonant frequency (Hz), and W is timber weight (Kg), and L is timber length (m), and I is a timber inertia distance (m4), and g is acceleration of gravity (9.8m/s2).

After the result who detects filed preservation, carry out the detection of next wood piece.

Problem and defective that the utility model exists at prior art need in conjunction with producing to use, and design provides a kind of quick nondestructive determinator.By being prerequisite need not to destroy detected object, it is detected effectively and tests, reach the raising detection efficiency, reduce labor intensity, guarantee that measurand and detecting instrument are not destroyed, reduce the purpose that detects cost.This pick-up unit principle promptly can be used as independent portable nondestructive detecting instrument and occurs, and can serve in the production line again.

Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.

Claims (10)

1, a kind of modulus of elasticity of wood the cannot-harm-detection device is characterized in that comprising:

Be used for supporting first supporting base (1) of timber to be measured (5);

Be used for supporting second supporting base (2) of timber to be measured (5);

Be arranged in the load sensor (7) of first supporting base (1) or second supporting base (2);

The signal process box (12) that connects described load sensor (7) via signal wire;

The data collecting card (12) that connects signal process box (12); And

The computing machine that is used for calculating modulus of elasticity of wood (14) that connects data collecting card (12).

2, modulus of elasticity of wood the cannot-harm-detection device according to claim 1 is characterized in that described first supporting base (1) comprising:

First base (8);

Be fixed on the described load sensor (7) on first base (8);

Be fixed on the supporting head that is used for contact measured timber (5) (6) on the described load sensor (7).

3, modulus of elasticity of wood the cannot-harm-detection device according to claim 1 is characterized in that described second supporting base (2) comprising:

Second base (11);

Be fixed on the support plate (10) on second base (11);

The edge of a knife (9) that connects described support plate (10).

4, modulus of elasticity of wood the cannot-harm-detection device according to claim 3 is characterized in that the described edge of a knife (9) connects described support plate (10) by screw (15).

5, modulus of elasticity of wood the cannot-harm-detection device according to claim 1 is characterized in that also comprising:

First support (3) that is threaded with described first supporting base (1); And

Second support (4) that is threaded with described second supporting base (2).

6, modulus of elasticity of wood the cannot-harm-detection device according to claim 1 is characterized in that described load sensor (7) is a S type tension-compression sensor.

7, modulus of elasticity of wood the cannot-harm-detection device according to claim 6, it is characterized in that described signal process box (12) has amplifies respectively by a plurality of described load sensors (7-1,7-2,7-3,7-4) a plurality of amplifiers of the signal of Cai Jiing.

8, modulus of elasticity of wood the cannot-harm-detection device according to claim 7 is characterized in that described data collecting card (13) has the A/D converter that the multichannel analog signals that described a plurality of amplifiers of described signal process box (12) are exported changes digital signal respectively into.

9, modulus of elasticity of wood the cannot-harm-detection device according to claim 1 is characterized in that described data collecting card (13) connects the USB interface of described computing machine (14) by the USB cable.

10, modulus of elasticity of wood the cannot-harm-detection device according to claim 9 is characterized in that described modulus of elasticity of wood $\mathrm{MOE}=f_r^{2}W{L}^3/\left(2.47\mathrm{Ig}\right),$

Wherein, fr is the resonant frequency that described load sensor (7) detects, and W is the timber weight that described load sensor (7) detects, and L is a timber length, and I is a timber inertia distance, and g is an acceleration of gravity.

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