CN202533410U

CN202533410U - Device for detecting moisture content of wood

Info

Publication number: CN202533410U
Application number: CN2012201732075U
Authority: CN
Inventors: 向诚; 桂玲; 孙华
Original assignee: SWAN COLLEGE CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
Current assignee: SWAN COLLEGE CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
Priority date: 2012-04-23
Filing date: 2012-04-23
Publication date: 2012-11-14
Anticipated expiration: 2022-04-23

Abstract

A device for detecting the moisture content of wood comprises a controller for counting, operating and controlling. The rear end of the controller is connected with a display system and a signal input device, the front end of the controller is connected with two acoustic sensors, one acoustic sensor is used for transmitting acoustic signals, and the other acoustic sensor is used for receiving the acoustic signals. Besides, in order to conveniently process the acoustic signals, an amplification shaping circuit and an A/D (analog-digital) conversion circuit are sequentially connected in series among the acoustic sensors and the controller. The inside of the wood can be processed by stress wave signals in a normal detection state, and the device is simple and rapid to operate and high in accuracy.

Description

Timber water cut sniffer

Technical field

The utility model belongs to electronic technology, wood science, Sensors & Testing Technology and mechanics field, relates to a kind of intelligent detection device of sound wave timber water cut.

Background technology

The method of traditional measurement moisture content has oven drying method, electrical measuring method and weight-loss method etc., in wood processing field, adopts oven drying method usually.It measures moisture content accurately and reliably, and does not receive the restriction of water percentage scope.But need the intercepting sample when measuring, destroy timber, and need the regular hour.And consuming time when with weight-loss method the timber water cut being measured, resistance rule error is bigger, non-destructive fast detecting and the needs that continue to detect during these detection methods all can not satisfy timber production and detect.Along with the continuous development of electronics, mechanics and computer technology, the sonic detection technology aspect water cut, the application facet of log inherent vice and foxiness more and more receives the concern of forestry researchist and industry.

The utility model content

The technical matters that the utility model solved is to provide a kind of timber water cut sniffer, to solve the shortcoming in the above-mentioned background technology.

The technical matters that the utility model solved adopts following technical scheme to realize:

Timber water cut sniffer comprises a controller that is used for doing counting, computing and control, and its rear end connects display system and signal input apparatus; Front end at controller then is connected with two sonic sensors, wherein, and in two sonic sensors; One is used to send acoustic signals; Another then is used for receiving acoustic signals, simultaneously, for ease acoustic signals is handled; Also be connected with amplification and rectification circuit and A/D change-over circuit between sonic sensor and the controller, both are connected in turn between sensor and the controller through the mode of series connection.

In the utility model, said controller adopts 51 single-chip microcomputers.

In the utility model, described display system links to each other with controller through driving circuit.

In the utility model, said signal input apparatus includes but not limited to mouse, keyboard and touch-screen.

Advantage of the utility model and effect:

1) timber water cut sonic detection is a kind of Dynamic Non-Destruction Measurement, neither destroys the primary characteristic of material, can obtain testing result at short notice continuously again;

2) easy to use, confined condition is few, human body is not had harm;

3) cost is low, has filled up domestic technological gap, has vast market prospect;

4) adopt sound wave sequential detection method, acquired signal is carried out Intelligent Recognition, get rid of the acoustic signals that produces under the improper detected state, thereby improve the precision and the accuracy of total system.

Description of drawings

Fig. 1 is the synoptic diagram of the utility model preferred embodiment.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with concrete diagram, further set forth the utility model.

Preferred embodiment referring to the timber water cut sniffer of Fig. 1; In an embodiment; Need the water cut of the dried China fir of even matter of certain known dimensions be detected; This dried China fir sample is of a size of 200mm * 16mm * 7mm, earlier with the length of wood sample through signal input apparatus 7 input controllers 5, and the transmission sensor 1 in two sonic sensors and receiving sensor 2 be placed on the top and the end of measured material respectively.

After ready; An end that knocks dried China fir sample with iron hammer is used for excite sound waves, and controller 5 picks up counting when sound wave reaches transmission sensor 1, when sound wave arrives receiving sensor 2; Controller 5 stops the travel-time of timing according to the sound wave that measures; Automatically calculate efferent echo in the inner velocity of propagation of this timber since the velocity of propagation of sound wave in trees or timber reduce with water percentage is different (like the transaudient speed of China fir, the every increase by 1% of water percentage; Transaudient speed 67 meter per seconds that just descend), the water cut in hence one can see that current test trees or the timber.

In the present embodiment, record average transaudient speed 6130 meter per seconds in this dried China fir sample,, record that water percentage is about 5.54% in this dried China fir sample with reference to average transaudient speed 5758 meter per seconds in the basic dried China fir.Meanwhile controller 5 is also given an order, and drives the moisture content value that display system 6 shows current institute assize wood or timber.

In the present embodiment, the also built-in elastic modulus computing module of controller 5, the user can be from parameters such as signal input apparatus 7 input density of wood, and controller 5 can be able to calculate the elastic modulus of timber.

More than show and described the advantage of ultimate principle, principal character and the utility model of the utility model.The technician of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the instructions that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection domain to be defined by appending claims and equivalent thereof.

Claims

1. timber water cut sniffer; It is characterized in that, comprise a controller, its rear end connects display system and signal input apparatus; And the front end at controller also is connected with two sonic sensors; Simultaneously, between sonic sensor and controller, also be connected with amplification and rectification circuit and A/D change-over circuit, both are connected in turn between sensor and the controller through the mode of series connection.

2. timber water cut sniffer according to claim 1 is characterized in that described display system links to each other with controller through driving circuit.