CN101696957B - Online nondestructive detecting instrument for wood materials - Google Patents
Online nondestructive detecting instrument for wood materials Download PDFInfo
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- CN101696957B CN101696957B CN2009100730893A CN200910073089A CN101696957B CN 101696957 B CN101696957 B CN 101696957B CN 2009100730893 A CN2009100730893 A CN 2009100730893A CN 200910073089 A CN200910073089 A CN 200910073089A CN 101696957 B CN101696957 B CN 101696957B
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- tubular shaft
- wood materials
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- instrument
- hollow stem
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an online nondestructive detecting instrument for wood materials, which relates to the online nondestructive detection of the wood materials, and can measure the elastic modulus of flitch, board squared timbers and log sections to evaluate the material properties of the materials. The online nondestructive detecting instrument controls a driving device so that two ends of a tested wood material are clamped by a wood material clamping device. A signal triggering and detecting device can trigger signals and detect transmitted signals and received signals. The transmitted signals and the received signals are amplified by a signal amplifier and then are transmitted to a fast fourier transform (FFT) analyzer to measure the time difference of trigger signals and the received signals, and the dynamic elastic modulus can be calculated by using a formula so as to evaluate the material properties of the tested wood material. The online nondestructive detecting instrument does not destroy the integrity of a tested piece, improves the labor efficiency, reduces the detection cost and lightens the labor intensity.
Description
Technical field
The present invention relates to a kind of online nondestructive detecting instrument for wood materials, is a kind of elastic modulus that utilizes the longitudinal wave propagation method to measure flitch, plate square bar and log juggle, thereby realizes the instrument of its material capability of evaluation.
Background technology
In order to use wood materials with holding water, just must detect its inner materials performance, elastic modulus promptly is to detect one of index.Traditional way is destructive the detection, is about to wood materials and destroys detection again.Because the test specimen that was detected by this method has not had use value, so can only take sampling Detection, has certain randomness and contingency.And this method length consuming time is not suitable for online detection.
The detection method of longitudinal wave propagation is, connect the test specimen two ends with sensor, utilizing ram hammer or vibrator to produce vibration at test specimen one end transmits, the sensor received signal of the test specimen other end, transmit and received signal passes to Fast Fourier Transform (FFT) (FFT) analyser after amplifying by signal amplifier, record the mistiming of trigger pip and received signal, utilize formula: E=ρ (L/T)
2, calculate the dynamic modulus of elasticity.In the formula: E is the dynamic modulus of elasticity, and ρ is the density of test specimen, and L is a test specimen length, and T is the travel-time.
Fig. 1 shows longitudinal wave propagation test simplified schematic diagram.In the drawings, label 101 expression test specimens, label 102,106 is represented left and right sides sensor respectively, label 103,105 is represented respectively and left and right sides signal amplifier, label 104 expression Fast Fourier Transform (FFT) (FFT) analysers.Lead is respectively with UNICOM between left side sensor (102), left-side signal amplifier (103), Fast Fourier Transform (FFT) (FFT) analyser (104) and right sensor (106), right-side signal amplifier (105), Fast Fourier Transform (FFT) (FFT) analyser (104).
Summary of the invention
The present invention has avoided the shortcoming of destructive detection, and by comprehensive utilization wood materials Non-Destructive Testing, Machine Design technology, electricity, design provides the instrument of a kind of flitch, plate square bar and the Non-Destructive Testing of log juggle elastic modulus.Thereby reach the integrality of not destroying test specimen, and raise labour efficiency, reduce the purpose that detects cost, reduces labor intensity.
The present invention can be by realizing as lower device jointly:
Support.Support is the support section of this instrument, is the basis that equipment is installed, and is the necessary condition that following each device is able to work.
The clamp device of wood materials.The clamp device of this instrument is made up of transmission gear, tubular shaft, and transmission gear has key to be connected with tubular shaft, transmits moment of torsion, and the tubular shaft front end has dop, is used to clamp tested wood materials.The latter half of outside of tubular shaft is provided with screw thread, and belt wheel is sleeved on the tubular shaft, and the threaded engagement of screw thread and tubular shaft is arranged.
The triggering of signal and the pick-up unit of signal.The signal triggering device of this instrument is to be positioned at the mandrel that the left side tubular shaft is installed.Left side tubular shaft xsect is 8 fonts, and mandrel is installed in a hole, and tubular shaft has key to be connected with mandrel, transmits moment of torsion, and when the tubular shaft dop clamped tested wood materials, mandrel impacted tested wood materials by the control continuation axial feed of control device, produces vibration.The less hollow stem of diameter is installed in another hole, and xsect is an o shape, in stud with sensor, sensor is used for detecting and transmits and received signal.Right side tubular shaft xsect is eccentric o shape, install with the left side tubular shaft in the identical hollow stem of specification, the hollow stem xsect is an o shape, in stud with sensor, sensor is used for detection and transmits and received signal.Hollow stem how much centers of circle in the left and right sides are on same horizontal line, and promptly hollow stem symmetry in the left and right sides is installed.Sensor is the signal supervisory instrument of this instrument.Sensor connects signal amplifier by lead, and signal amplifier connects Fast Fourier Transform (FFT) (FFT) analyser by lead.
Drive unit.The drive unit of this instrument is made of jointly motor, wheel box, transmission shaft, belt wheel, belt, worm gear, worm screw and the belt wheel that is sleeved on the tubular shaft.The pick-up unit that makes the triggering of clamp device, signal of wood materials and signal by mechanical drive is by the predetermined conception campaign of design, to reach its intended purposes.
Control device.Control device is fixed on the support, controls the motion of the pick-up unit of the triggering of clamp device, signal of wood materials and signal by brake.
To sum up, in conjunction with the detection method of longitudinal wave propagation,, just can record the elastic modulus of flitch, plate square bar and log juggle quick, easy, accurately by using this nondestructive detecting instrument.And do not destroy test specimen, thereby improved the utilization factor of wood materials.
Description of drawings
Fig. 1 shows longitudinal wave propagation test simplified schematic diagram.
Fig. 2 shows right side clamp device structural representation.
Fig. 3 shows left side clamp device structural representation.
Fig. 4 shows right side tubular shaft cross sectional representation.
Fig. 5 shows left side tubular shaft cross sectional representation.
Fig. 6 shows the driving device structure synoptic diagram.
Fig. 7 shows the simple and clear front view of this nondestructive detecting instrument.
The number in the figure explanation:
101, tested wood materials; 102, left side sensor; 103, left-side signal amplifier; 104, Fast Fourier Transform (FFT) (FFT) analyser; 105, right-side signal amplifier; 106, right sensor.
201, dop; 202, right side tubular shaft; 203, hollow stem; 204, key; 205, spacer; 206, spring bearing; 207, transmission gear; 208, flat key; 209, spacer; 210, thrust bearing; 211, belt wheel; 212, hollow stem thrust bearing; 213, spring bearing.
301, mandrel; 302, left side tubular shaft; 303, mandrel thrust bearing.
601, main motor; 602, wheel box; 603, transmission shaft; 604, support; 605, belt wheel; 606, belt; 607, motor; 608, worm gear; 609, worm screw.
701, drive unit; 702, left side clamp device; 703, right side clamp device; 704, drive unit; 705, control device.
Embodiment
Below in conjunction with accompanying drawing 1-Fig. 7 embodiments of the present invention are given a detailed account.
With reference to figure 1, Fig. 3 and Fig. 7, nondestructive detecting instrument of the present invention is divided into and is support 604, control device 705, drive unit 701,704, the clamp device 702,703 of wood materials, the triggering of signal and the pick-up unit of signal (mandrel 301 trigger pips, sensor 102, sensor 106 detection signals).Control device 705 makes the clamp device 702,703 of wood materials clamp tested wood materials test specimen by accessory drive 701.Again, control device 705 makes mandrel 301 axial feeds by accessory drive 704, impacts tested wood materials 101 trigger pips.Again, control device 705 makes sensor 102, sensor 106 detection signals by accessory drive 704 by control hollow stem 203.
With reference to figure 2, Fig. 3, Fig. 6 and Fig. 7,202,302 is respectively the right side tubular shaft and the left side tubular shaft of clamp device 702 of clamp device 703, the left side wood materials of right side wood materials among the present invention among the figure, the left side tubular shaft 302 and right side tubular shaft 202 outsides all are equipped with transmission gear 207, have flat key 208 to be connected with transmission gear 207.Wherein mandrels 301 are installed in tubular shaft 302 inside in left side, and mandrel 301 has key 204 to be connected with left side tubular shaft 302.Left and right sides tubular shaft 302, the 202 inner hollow stems 203 of installing, hollow stem 203 has key 204 to be connected with left and right sides tubular shaft 302,202.Be separately installed with left side sensor 102, right sensor 106 in the middle of the left and right sides hollow stem 203.Tubular shaft 302,202 front ends in the left and right sides all have dop 201, and tubular shaft 302,202 rear outside in the left and right sides are provided with screw thread, all are with belt wheel 211, and there is latter half of cooperation of screw thread and left and right sides tubular shaft 302,202 belt wheel 211 inside.Operator's operating control device 705 is braked main motor 601 by wheel box 602, makes transmission shaft 603 by being fixed on the belt wheel 605 on the support 604, drives belt 606, and the belt wheel 211 that is enclosed within on the left and right sides tubular shaft 302,202 is rotated.By the rotation of belt wheel 211, the left and right sides tubular shaft 302,202 of band dop 201 is moved axially, clamp tested wood materials 101.After, operator's operating control device 705, brake motor 607, be fixed on worm gear 608, worm screw 609 on the support 604 by control, control is installed in the hollow stem 203 in the left and right sides tubular shaft 302,202, make hollow stem 203 axial feeds be adjacent to tested wood materials 101, make the left and right sides sensor 102,106 that is installed in the hollow stem 203 can detect trigger pip and received signal accurately.After, operator's operating control device 705, brake motor 607, be fixed on worm gear 608, worm screw 609 on the support 604 by control, control is installed in the mandrel 301 in the left side tubular shaft 302, makes mandrel 301 axial feeds impact tested wood materials 101, produce vibration, as trigger pip.Front and rear at left and right sides tubular shaft 302,202 is separately installed with spring bearing 206 and spring bearing 213, between front and back bearings 206,213 and transmission gear 207, be respectively equipped with spacer 205 and spacer 209, in belt wheel 211 both sides, hollow stem 203 rear ends and mandrel 301 rear ends are separately installed with thrust bearing 210, thrust bearing 212 and thrust bearing 303, to bear axial force.
According to as upper type by left and right sides sensor 102,106 measured transmit and received signal passes to Fast Fourier Transform (FFT) (FFT) analyser 104 after amplifying by left and right sides signal amplifier 103,105, record the mistiming of trigger pip and received signal, utilize formula: E=ρ (L/T)
2, calculate the dynamic modulus of elasticity.In the formula: E is the dynamic modulus of elasticity, and ρ is the density of test specimen, and L is a test specimen length, and T is the travel-time.
Technical scope of the present invention is not limited to the described scope of literal in summary of the invention and the embodiment, also relates to the scope after displacement easily on the basis of the present invention.
Claims (3)
1. an online nondestructive detecting instrument for wood materials is characterized in that, comprising:
(1) support: support instrument, be used for installing and fixing following each device;
(2) clamp device of wood materials: be used to clamp tested wood materials;
(3) pick-up unit of the triggering of signal and signal: the signal triggering device of this instrument is to be positioned at the mandrel that the left side tubular shaft is installed, and produces mechanical wave as trigger pip by physical shock; The signal supervisory instrument of this instrument is the sensor of edge in the hollow stem, is used for detecting transmitting and received signal; Sensor connects signal amplifier by lead, and signal amplifier connects Fast Fourier Transform (FFT) (FFT) analyser by lead;
(4) drive unit: the drive unit of this instrument is made of jointly motor, wheel box, transmission shaft, belt wheel, belt, worm gear, worm screw and the belt wheel that is sleeved on the tubular shaft, the pick-up unit that makes the triggering of clamp device, signal of wood materials and signal by mechanical drive is by the predetermined conception campaign of design, to reach its intended purposes;
(5) control device: control device is fixed on the support, controls the motion of the pick-up unit of the triggering of clamp device, signal of wood materials and signal by brake.
2. online nondestructive detecting instrument for wood materials as claimed in claim 1 is characterized in that:
The clamp device of wood materials is made up of transmission gear, tubular shaft, and transmission gear has key to be connected with tubular shaft, transmits moment of torsion, and the tubular shaft front end has dop, is used to clamp tested wood materials; The latter half of outside of tubular shaft is provided with screw thread, and belt wheel is sleeved on the tubular shaft, and the threaded engagement of screw thread and tubular shaft is arranged.
3. online nondestructive detecting instrument for wood materials as claimed in claim 1 is characterized in that:
In the triggering of signal and the pick-up unit of signal, left side tubular shaft xsect is 8 fonts, mandrel is installed in one hole, tubular shaft has key to be connected with mandrel, transmit moment of torsion, when the tubular shaft dop clamped tested wood materials, mandrel impacted tested wood materials by the control continuation axial feed of control device, produces vibration; The less hollow stem of diameter is installed in another hole, and xsect is an o shape, in stud with sensor; Right side tubular shaft xsect is eccentric o shape, installs and the interior identical hollow stem of specification of left side tubular shaft, and the hollow stem xsect is an o shape, in stud with sensor; Hollow stem how much centers of circle in the left and right sides are on same horizontal line, and promptly hollow stem symmetry in the left and right sides is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100730893A CN101696957B (en) | 2009-10-26 | 2009-10-26 | Online nondestructive detecting instrument for wood materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100730893A CN101696957B (en) | 2009-10-26 | 2009-10-26 | Online nondestructive detecting instrument for wood materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101696957A CN101696957A (en) | 2010-04-21 |
| CN101696957B true CN101696957B (en) | 2011-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100730893A Expired - Fee Related CN101696957B (en) | 2009-10-26 | 2009-10-26 | Online nondestructive detecting instrument for wood materials |
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| Country | Link |
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| CN (1) | CN101696957B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901106A (en) * | 2014-03-12 | 2014-07-02 | 江苏科技大学 | Nondestructive evaluation method of stress of cladding layer based on critical refraction longitudinal wave |
| CN111307871B (en) * | 2019-12-30 | 2022-06-07 | 北京农学院 | Be used for not having (declining) to decrease and detect little test piece material performance test piece fixing device of wooden structure |
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2009
- 2009-10-26 CN CN2009100730893A patent/CN101696957B/en not_active Expired - Fee Related
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| CN101696957A (en) | 2010-04-21 |
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Granted publication date: 20110406 Termination date: 20111026 |