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Continuous wood dynamic elastic modulus eccentric pressure roller testing equipment and method

A technology of dynamic elastic modulus and detection equipment, applied in the field of grade detection, can solve problems such as wood expansion error value, and achieve the effect of eliminating detection errors and avoiding influences.

Active Publication Date: 2016-06-15
黑龙江省木材科学研究所 +2
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Problems solved by technology

[0022] In order to solve the problem that the existing wood dynamic elastic modulus detection technology has detection errors, and the anisotropy of wood will further expand the error value, the present invention further provides a continuous wood dynamic elastic modulus eccentric pressure roller detection equipment and method, It is easy to operate, and can be used in practical wood safety grade classification; it provides an effective theoretical basis for improving the detection of wood elastic modulus and safety grade classification

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  • Continuous wood dynamic elastic modulus eccentric pressure roller testing equipment and method
  • Continuous wood dynamic elastic modulus eccentric pressure roller testing equipment and method
  • Continuous wood dynamic elastic modulus eccentric pressure roller testing equipment and method

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specific Embodiment approach 1

[0044] Specific implementation mode one: combine figure 1 and figure 2 To illustrate, the continuous wood dynamic modulus of elasticity eccentric pressure roller testing equipment in this embodiment includes:

[0045] Frame 1, at least four auxiliary backup rolls 2, at least two main backup rolls 3, head frame 7, eccentric roll head 8, pneumatic cylinder 12 and sensor 14;

[0046] Described frame 1 is provided with at least six groups of backup rollers along its lengthwise direction, including at least four groups of auxiliary backup rollers 2 and two groups of main backup rollers 3, two groups of main backup rollers 3 are positioned at the middle part of frame 1, two The set of main support rolls 3 is arranged symmetrically with the center line of the frame 1, at least four groups of auxiliary support rolls 2 are arranged on both sides of the main support roll 3, the press head frame 7 is arranged on the frame 1, and the press head frame 7 The centerline of the centerline ...

specific Embodiment approach 2

[0048] Specific embodiment two: this embodiment is based on the realization of specific embodiment one, the continuous wood dynamic elastic modulus eccentric pressure roller detection method, the specific steps are: the wood test piece is transported to the bottom of the eccentric roller pressure head 8 by the support roller, And the eccentric roller head 8 corresponds to the midpoint of the effective length of the timber specimen, and the pneumatic cylinder applies a load to the midpoint of the effective length of the timber specimen, and the load change value of the timber specimen is detected by the load cell, which is brought into the elastic modulus calculation formula to obtain the modulus of elasticity value;

[0049] E = l dbP ( f 1 - f 2 )

[0050] In the formula:

[0051] l:...

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Abstract

The invention discloses continuous wood dynamic elastic modulus eccentric pressure roller detection equipment and a method, belonging to the technical field of wood strength grade detection. The invention aims to solve the problem that the detection error exists in the existing wood dynamic elastic modulus detection technology, and the anisotropy of the wood will further enlarge the error value. The frame of the testing equipment is provided with at least six sets of support rollers along its length direction, two sets of main support rollers are located in the middle of the frame, at least four sets of auxiliary support rollers are arranged on both sides of the main support rollers, and the indenter frame is set On the frame, the eccentric roller head is rotatably installed on the frame of the head, and a pneumatic cylinder and a sensor are arranged in the frame. Detection method: Apply a load to the midpoint of the effective length of the wood specimen by a pneumatic cylinder, detect the deformation and load change value, bring it into the elastic modulus, and obtain the elastic modulus value. The invention is used for continuous wood dynamic elastic modulus detection.

Description

technical field [0001] The invention relates to a wood dynamic elastic modulus detection device and method, belonging to the technical field of wood strength grade detection. Background technique [0002] In North America, Europe and other local countries, the detection of wood elastic modulus has been widely used in the safety strength classification of wood. Timber classification is still in its infancy in China. [0003] Elastic modulus testing of wood is a non-destructive test that classifies wood into suitable grades. The relationship between wood stiffness and strength was established by full-scale non-destructive testing. Therefore, the strength of the wood can be estimated directly by non-destructively measuring the stiffness of the wood, and then the standard timber can be divided into different grades according to the set grade strength value and stiffness design value. [0004] The specific principle of the existing detection equipment is to use the method of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/10
Inventor 王宏棣花军王子奇雷明贾娜
Owner 黑龙江省木材科学研究所
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