An intelligent testing device for mechanical properties of wood components

Abstract

The invention provides an intelligent testing device for mechanical properties of wood components, comprising two probes, a mechanical sensor, a moisture content sensor, a laser ranging sensor, an integrated circuit board and an insulating shell; the moisture content of the wood component is measured by the moisture content sensor; the resistance value of the probe penetrating into the wood component is obtained by the mechanical sensor; the depth of the probe penetrating into the wood component is obtained by the laser ranging sensor; the integrated circuit board calculates the stress wave velocity of the wood component according to the functional relationship between the stress wave velocity of the wood component and the moisture content of the wood component; the density of the wood component is calculated according to the functional relationship between the ratio of the resistance value of the probe penetrating into the wood component and the depth of the probe penetrating into the wood component and the density of the wood component; the elastic modulus of the wood component and the bending strength of the wood component are respectively obtained according to the functional relationship between the product of the square of the stress wave velocity of the wood component and the density of the wood component and the elastic modulus of the wood component and the bending strength of the wood component, so that the mechanical properties of the wood component can be obtained quickly and conveniently.

Description

Technical Field

[0001] The invention belongs to the field of wood component detection, and in particular relates to an intelligent testing device for mechanical properties of wood components. Background Art

[0002] There are a large number of excellent existing buildings in my country, such as traditional wooden ancient buildings and brick-wood mixed structures. These wooden structures are important cultural relics and precious historical and cultural heritage of my country. At the same time, many modern wooden structures have also been newly built in recent years.

[0003] During the construction phase of a wooden structure building, it is very important to accurately evaluate the mechanical properties of the materials and select components that meet the mechanical design properties in order to ensure the quality of the materials and the safety of the structure.

[0004] In the protection and restoration of existing wooden structure construction projects, it is necessary to obtain the material performance information of wooden components as accurately as possible, which is of great significance for judging their safety and health, implementing preventive protection, and conducting scientific and reasonable repairs. Traditionally, the mechanical properties of wood are mostly tested by instruments or mechanical testing machines, which takes a long time, has harsh conditions, poor stability and reproducibility, and is not suitable for non-destructive and rapid testing.

[0005] At present, non-destructive testing of wood components mainly uses non-destructive testing technologies such as stress wave method and micro-drill resistance method to measure the mechanical properties of wood materials and components, which can overcome the defects of traditional methods. However, stress wave detection method and micro-drill resistance method have disadvantages such as large and complex equipment and complicated operation. There is an urgent need for a fast and easy-to-operate detection method. Summary of the invention

[0006] The present invention aims to provide an intelligent testing device for the mechanical properties of wood components, which solves the problem that the existing instruments or mechanical testing machines used to test the mechanical properties of wood are not suitable for non-destructive and rapid testing, and the existing non-destructive testing equipment is large and complex, and the operation is complicated.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] An intelligent testing device for mechanical properties of wood components, comprising two probes, a mechanical sensor, a moisture sensor, a laser ranging sensor, an integrated circuit board, a power supply module, a display instrument and an insulating shell, wherein the mechanical sensor, the moisture sensor, the integrated circuit board and the power supply module are respectively located inside the insulating shell, the display instrument is arranged on the outer surface of the insulating shell, the two probes are arranged in parallel, one end of the probe is arranged inside the insulating shell, the other end of the probe is provided with a conical needle tip and is located outside the insulating shell, the mechanical sensor is arranged on the end of one of the probes located inside the insulating shell, the two probes are respectively connected to the two ends of the moisture sensor, the laser ranging sensor is arranged on the insulating shell between the two probes, the laser direction of the laser ranging sensor is parallel to the length direction of the probe, and the laser The transmitting end and the receiving end of the distance measuring sensor are flush with the outside of the insulating shell, and the integrated circuit board is respectively connected to the mechanical sensor, the moisture content sensor, the laser distance measuring sensor, the power supply module and the display instrument; when the two probes penetrate into the wood component, the moisture content W of the wood component can be measured by the moisture content sensor, and the resistance value F of the probe penetrating into the wood component can be obtained by the mechanical sensor; the depth h of the probe penetrating into the wood component can be obtained by the laser distance measuring sensor; the integrated circuit board can calculate the stress wave velocity v of the wood component according to the functional relationship between the stress wave velocity v of the wood component and the moisture content W of the wood component; the density ρ of the wood component can be calculated according to the functional relationship between the ratio of the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component and the density ρ of the wood component; the product ρv of the square of the stress wave velocity v of the wood component and the density ρ of the wood component is obtained. 2 The functional relationship between the elastic modulus E of the wood component and the wood component can be used to obtain the elastic modulus E of the wood component; according to the product of the square of the stress wave velocity v of the wood component and the density ρ of the wood component, ρv 2 The bending strength of wood components b The functional relationship of the wood component bending strength σ can be obtained b .

[0009] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, the functional relationship between the ratio of the resistance value F of the probe penetrating into the wooden component to the depth h of the probe penetrating into the wooden component and the density ρ of the wooden component is obtained by deep learning fitting or by regression analysis fitting, and the functional relationship between the ratio F / h of the resistance value F of the probe penetrating into the wooden component to the depth h of the probe penetrating into the wooden component and the density ρ of the wooden component is ρ=0.0779 F / h+0.0021.

[0010] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, the functional relationship between the stress wave velocity v of the wooden component and the moisture content W of the wooden component is obtained by deep learning fitting or by regression analysis fitting, and the functional relationship between the stress wave velocity v of the wooden component and the moisture content W of the wooden component is v=0.2915 W^2-33.508W+5191.6.

[0011] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wood components, the integrated circuit board is based on the product ρv of the square of the stress wave velocity v of the wood component and the density ρ of the wood component. 2 Function formula of elastic modulus E of wood component: E=ρv 2 , and obtain the elastic modulus E of the wood component; the integrated circuit board is based on the product ρv of the square of the stress wave velocity v of the wood component and the density ρ of the wood component 2 The bending strength of wood components b Function formula: σ b = -0.0018 ρv 2 + 90.172, the bending strength of the wood member σ b .

[0012] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, when the probe tips penetrate into the interior of the wooden component, a line connecting the insertion points of two probes on the surface of the wooden component is parallel to the grain direction of the wooden component.

[0013] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, the laser ranging sensor can obtain the depth h of the probe penetrating into the wooden component, including directly measuring the distance between the wooden component and the insulating shell when the probe penetrates into the wooden component through the laser ranging sensor, and the integrated circuit board obtains the depth h of the probe penetrating into the wooden component by subtracting the distance between the wooden component and the insulating shell when the probe penetrates into the wooden component from the total length of the probe outside the insulating shell.

[0014] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wood components, the integrated circuit board measures the resistance R between the two probes inserted into the wood component through the moisture content sensor, and uses the function formula of moisture content and resistance: W= , obtain the moisture content W of the wood component.

[0015] Preferably, in the above-mentioned intelligent testing device for the mechanical properties of wooden components, both ends of the moisture content sensor are respectively provided with holes for one end of the probe to pass through, and the rod section of the probe located inside the insulating shell is provided with an external thread, and one end of the two probes respectively pass through the corresponding holes on the moisture content sensor and are respectively fixed with two first nuts.

[0016] Preferably, in the above-mentioned intelligent testing device for the mechanical properties of wooden components, the integrated circuit board includes a core processor, an acquisition module, a transmission module and a storage module, the acquisition module, the transmission module and the storage module are respectively connected to the core processor, and the acquisition module is respectively connected to the mechanical sensor, the moisture content sensor and the laser ranging sensor.

[0017] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, the display instrument adopts a touch display screen.

[0018] It can be seen from the technical solutions disclosed above that, compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In summary, the present invention provides an intelligent testing device for the mechanical properties of wood components, comprising two probes, a mechanical sensor, a moisture content sensor, a laser ranging sensor, an integrated circuit board, a power supply module, a display instrument and an insulating shell, wherein the mechanical sensor, the moisture content sensor, the integrated circuit board and the power supply module are respectively located inside the insulating shell, the display instrument is arranged on the outer surface of the insulating shell, the two probes are arranged in parallel, one end of the probe is arranged inside the insulating shell, the other end of the probe is provided with a conical needle tip and is located outside the insulating shell, the mechanical sensor is arranged on the end of one of the probes located inside the insulating shell, the two probes are respectively connected to the two ends of the moisture content sensor, the laser ranging sensor is arranged on the insulating shell between the two probes, and the laser direction of the laser ranging sensor is parallel to the length direction of the probe. The transmitting end and the receiving end of the laser distance sensor are flush with the outer surface of the insulating shell, and the integrated circuit board is respectively connected to the mechanical sensor, the moisture content sensor, the laser distance sensor, the power supply module and the display instrument; when the two probes penetrate into the interior of the wooden component, the moisture content W of the wooden component can be measured by the moisture content sensor, and the resistance value F of the probe penetrating into the wooden component can be obtained by the mechanical sensor; the depth h of the probe penetrating into the wooden component can be obtained by the laser distance sensor; the integrated circuit board can calculate the stress wave velocity v of the wooden component according to the functional relationship between the stress wave velocity v of the wooden component and the moisture content W of the wooden component; the density ρ of the wooden component can be calculated according to the functional relationship between the ratio of the resistance value F of the probe penetrating into the wooden component and the depth h of the probe penetrating into the wooden component and the density ρ of the wooden component; the product ρv of the square of the stress wave velocity v of the wooden component and the density ρ of the wooden component is obtained. 2 The functional relationship between the elastic modulus E of the wood component and the wood component can be used to obtain the elastic modulus E of the wood component; according to the product of the square of the stress wave velocity v of the wood component and the density ρ of the wood component, ρv 2 The bending strength of wood components b The functional relationship of the wood component bending strength σ can be obtained b .

[0020] On the one hand, the present invention can measure the moisture content W of the wood component, the resistance value F of the probe penetrating into the wood component, and the depth h of the probe penetrating into the wood component by holding the wood component mechanical property intelligent testing device in hand, and calculate the density ρ of the wood component, the stress wave velocity v of the wood component, and the mechanical properties of the wood component (including the elastic modulus E of the wood component and the bending strength σ of the wood component) b ), compared with traditional micro-drill resistance meters and stress wave equipment, the equipment is simple and light, and on-site operation is more convenient and faster.

[0021] On the other hand, the present invention inserts two probes into the surface of the wood component perpendicularly by holding the intelligent testing device for mechanical properties of the wood component, so as to simultaneously measure the moisture content W of the wood component, the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component, and calculate the density ρ of the wood component, the stress wave velocity v of the wood component and the mechanical properties of the wood component. The traditional test needs to test the density ρ of the wood component, the stress wave velocity v of the wood component and the moisture content W of the wood component respectively, which will cause multiple damages to the wood component. The present invention only needs to insert the handheld testing device into the wood component once, and the operation is simple and convenient. In addition, the insertion depth of the probe is shallow, there is no requirement for the insertion depth, and the damage to the wood component is smaller, thereby achieving micro-damage detection.

[0022] On the other hand, the present invention uses the functional relationship between the stress wave velocity v of the wood component and the moisture content W of the wood component to calculate the stress wave velocity v of the wood component; uses the functional relationship between the density ρ of the wood component and the ratio of the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component to calculate the density ρ of the wood component; uses the elastic modulus E of the wood component and the bending strength σ of the wood component to calculate the density ρ of the wood component. b The functional relationship between the stress wave velocity v of the wood component and the density ρ of the wood component is used to calculate the elastic modulus E of the wood component and the bending strength σ of the wood component. b There is no need to use stress wave equipment to obtain stress wave velocity v, and there is no need to use micro-drill resistance meter to continuously drill or other methods to obtain density ρ. Therefore, there is no need to use multiple devices to operate separately, which shortens the test time and effectively saves labor costs, economic costs and time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an intelligent testing device for mechanical properties of wood components.

[0024] Figure 2 It is a schematic diagram of the use status of the intelligent testing device for the mechanical properties of wood components.

[0025] Figure 3 It is a schematic diagram of the functional relationship between the ratio of the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component and the density ρ of the wood component.

[0026] Figure 4 It is a schematic diagram of the functional relationship between the stress wave velocity v of the wood component and the moisture content W of the wood component.

[0027] In the figure: 1-probe, 2-mechanical sensor, 3-moisture content sensor, 4-laser ranging sensor, 5-integrated circuit board, 6-power supply module, 7-display instrument, 8-insulating shell, 9-first nut, 10-second nut, 11-wooden component. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The technical content and features of the present invention will be described in detail below by combining the enumerated embodiments with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the accompanying drawings, but this cannot be a limitation of the technical solution of the present invention.

[0029] See also Figures 1 to 4 The present embodiment discloses an intelligent testing device for mechanical properties of wood components, comprising two probes 1, a mechanical sensor 2, a moisture sensor 3, a laser ranging sensor 4, an integrated circuit board 5, a power supply module 6, a display instrument 7 and an insulating shell 8, wherein the mechanical sensor 2, the moisture sensor 3, the integrated circuit board 5 and the power supply module 6 are respectively located inside the insulating shell 8, the display instrument 6 is arranged on the outer surface of the insulating shell 8, the two probes 1 are arranged in parallel, one end of the probe 1 is arranged inside the insulating shell 8, the other end of the probe 1 is provided with a conical needle tip and is located outside the insulating shell 8, the mechanical sensor 2 is arranged on the end of one of the probes located inside the insulating shell 8, the two probes 1 are respectively connected to the two ends of the moisture sensor 3, the laser ranging sensor 4 is arranged on the insulating shell 8 between the two probes 1, The laser direction of the optical distance sensor 4 is parallel to the length direction of the probe 1, and the integrated circuit board 5 is respectively connected to the mechanical sensor 2, the moisture content sensor 3, the laser distance sensor 4, the power supply module 6 and the display instrument 7; when the two probes 1 penetrate into the wooden component 11, the moisture content W of the wooden component can be measured by the moisture content sensor 3, and the resistance value F of the probe penetrating into the wooden component can be obtained by the mechanical sensor 2; the depth h of the probe penetrating into the wooden component can be obtained by the laser distance sensor 4; the integrated circuit board 5 can calculate the stress wave velocity v of the wooden component according to the functional relationship between the stress wave velocity v of the wooden component and the moisture content W of the wooden component; the density ρ of the wooden component can be calculated according to the functional relationship between the ratio of the resistance value F of the probe penetrating into the wooden component and the depth h of the probe penetrating into the wooden component and the density ρ of the wooden component; the product ρv of the square of the stress wave velocity v of the wooden component and the density ρ of the wooden component 2The functional relationship between the elastic modulus E of the wood component and the wood component can be used to obtain the elastic modulus E of the wood component; according to the product of the square of the stress wave velocity v of the wood component and the density ρ of the wood component, ρv 2 The bending strength of wood components b The functional relationship of the wood component bending strength σ can be obtained b .

[0030] On the one hand, the present invention can measure the moisture content W of the wood component, the resistance value F of the probe penetrating into the wood component, and the depth h of the probe penetrating into the wood component by holding the wood component mechanical property intelligent testing device in hand, and calculate the density ρ of the wood component, the stress wave velocity v of the wood component, and the mechanical properties of the wood component (including the elastic modulus E of the wood component and the bending strength σ of the wood component) b ), compared with traditional micro-drill resistance meters and stress wave equipment, the equipment is simple and light, and on-site operation is more convenient and faster.

[0031] On the other hand, the present invention can simultaneously measure the moisture content W of the wood component, the resistance value F of the probe penetrating into the wood component, and the depth h of the probe penetrating into the wood component by holding the wood component mechanical property intelligent testing device vertically, and calculate the density ρ of the wood component, the stress wave velocity v of the wood component, and the mechanical properties of the wood component (including the elastic modulus E of the wood component and the bending strength σ of the wood component). b ), while the traditional test needs to test the density ρ of the wood component, the stress wave velocity v of the wood component and the moisture content W of the wood component respectively, which will cause multiple damages to the wood component 11. The present invention only needs to insert the handheld test device into the wood component 11 once, which is simple and convenient to operate, and the insertion depth of the probe is shallow, there is no requirement for the piercing depth, and the damage to the wood component 11 is smaller, thereby achieving micro-damage detection.

[0032] On the other hand, the present invention integrates various sensors, and obtains the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component by quickly inserting the probe 1 into the wood component. The stress wave velocity v of the wood component is calculated by using the functional relationship between the stress wave velocity v of the wood component and the moisture content W of the wood component; the density ρ of the wood component is calculated by using the functional relationship between the density ρ of the wood component and the ratio of the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component; the elastic modulus E of the wood component and the bending strength σ of the wood component are calculated. b The functional relationship between the stress wave velocity v of the wood component and the density ρ of the wood component is used to calculate the elastic modulus E of the wood component and the bending strength σ of the wood component. b Finally, the moisture content W of the wood component, the density ρ of the wood component, the resistance value F of the probe penetrating the wood component, the elastic modulus E of the wood component and the bending strength σ of the wood component can be quickly obtained by inserting the handheld test device into the wood component 11 once. b, there is no need to use multiple devices to operate separately, which shortens the test time and effectively saves manpower costs, economic costs and time costs.

[0033] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, the functional relationship between the ratio of the resistance value F of the probe penetrating into the wooden component to the depth h of the probe penetrating into the wooden component and the density ρ of the wooden component is obtained by deep learning fitting or by regression analysis fitting, and the functional relationship between the ratio F / h of the resistance value F of the probe penetrating into the wooden component to the depth h of the probe penetrating into the wooden component and the density ρ of the wooden component is ρ=0.0779 F / h+0.0021.

[0034] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, the functional relationship between the stress wave velocity v of the wooden component and the moisture content W of the wooden component is obtained by deep learning fitting or by regression analysis fitting, and the functional relationship between the stress wave velocity v of the wooden component and the moisture content W of the wooden component is v=0.2915 W^2-33.508W+5191.6.

[0035] The present invention obtains the functional relationship between the ratio F / h of the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component and the density ρ of the wood component by deep learning fitting or regression analysis fitting: ρ=0.0779 F / h+0.0021, so that the density ρ of the wood component can be directly calculated using the resistance value F of the probe penetrating into the wood component obtained by the mechanical sensor and the depth h of the probe penetrating into the wood component obtained by the laser ranging sensor; the functional relationship between the stress wave velocity v of the wood component and the moisture content W of the wood component is obtained by deep learning fitting or regression analysis fitting: v=0.2915 W^2-33.508W+5191.6, so that the moisture content W of the wood component obtained by the moisture content sensor can be used to directly calculate the stress wave velocity v of the wood component; and then the elastic modulus E of the wood component and the bending strength σ of the wood component can be used b The functional relationship between the stress wave velocity v of the wood component and the density ρ of the wood component is used to calculate the elastic modulus E of the wood component and the bending strength σ of the wood component. b There is no need to use stress wave equipment to obtain stress wave velocity v, and there is no need to use micro-drill resistance meter to continuously drill holes or other methods to obtain density ρ. Therefore, there is no need to use multiple devices to operate separately, which effectively improves the test efficiency and saves labor costs, economic costs and time costs.

[0036] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wood components, the integrated circuit board 5 is based on the product ρv of the square of the stress wave velocity v of the wood component and the density ρ of the wood component. 2 Function formula of elastic modulus E of wood component: E=ρv 2, the elastic modulus E of the wood component is obtained; according to the product of the square of the stress wave velocity v of the wood component and the density ρ of the wood component, ρv 2 The bending strength of wood components b Function formula: σ b = -0.0018 ρv 2 + 90.172, the bending strength of the wood member σ b The product of the square of the stress wave velocity v of the wood component and the density ρ of the wood component is ρv 2 The functional formula of the elastic modulus E of the wood component and the product of the square of the stress wave velocity v of the wood component and the density ρ of the wood component ρv 2 The bending strength of wood components b The function formulas are all prior art.

[0037] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wood components, when the tip of the probe 1 is inserted into the wood component 11, the line connecting the insertion points of the two probes 1 on the surface of the wood component 11 is parallel to the grain direction of the wood component 11. Since the line connecting the insertion points of the two probes 1 on the surface of the wood component 11 is parallel to the grain direction of the wood component 11, the resistance can be tested along the grain direction of the wood component 11, and the moisture content of the wood component converted by resistance testing along the grain direction of the wood component 11 is more accurate.

[0038] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, the laser ranging sensor 4 can obtain the depth h of the probe penetrating into the wooden component, including directly measuring the distance between the wooden component 11 and the insulating shell 8 when the probe penetrates into the wooden component (i.e., the distance between the laser ranging sensor 4 and the wooden component 11) by the laser ranging sensor 4, and the integrated circuit board 5 obtains the depth h of the probe penetrating into the wooden component by subtracting the distance between the wooden component 11 and the insulating shell 8 when the probe 1 penetrates into the wooden component 11 from the total length of the probe 1 outside the insulating shell 8 (i.e., the total length of the probe 1 located outside the insulating shell 8).

[0039] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wood components, the integrated circuit board 5 measures the resistance R between the two probes 1 inserted into the wood component through the moisture content sensor 3, and uses the function formula of moisture content and resistance: W= , obtain the moisture content W of the wood component, where the unit of the moisture content W of the wood component is %.

[0040] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wooden components, both ends of the moisture sensor 3 are respectively provided with holes for one end of the probe 1 to pass through, and the rod section of the probe 1 located inside the insulating shell 8 is provided with an external thread, and one end of the two probes 1 respectively passes through the corresponding holes on the moisture sensor 3 and are respectively fixed with two first nuts, and the internal thread of the first nut 9 matches the external thread on the probe 1, thereby achieving a stable connection between the probe and the moisture sensor 3.

[0041] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wood components, a through hole is provided on the insulating shell for the probe 1 to pass through, and a second nut 10 is provided in the through hole, and the internal thread of the second nut 10 matches the external thread on the probe, thereby realizing a stable connection between the probe and the insulating shell 8. The mechanical sensor is connected to the probe 1 by screws or clamps, and the mechanical sensor 2, moisture content sensor 3, laser ranging sensor 4, integrated circuit board 5, and display instrument 7 are respectively fixedly connected to the insulating shell 8 by screws, screws, etc., thereby realizing a stable connection of various components in the insulating shell 8.

[0042] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wood components, the integrated circuit board 5 includes a core processor, an acquisition module, a transmission module and a storage module, and the acquisition module, the transmission module and the storage module are respectively connected to the core processor, and the acquisition module is respectively connected to the mechanical sensor 2, the moisture sensor 3 and the laser ranging sensor 4. The integrated circuit board 5 can realize programming calculation, data transmission and data storage functions. Specifically, the acquisition module receives the measurement data from the mechanical sensor 2, the moisture sensor 3 and the laser ranging sensor 4 respectively; the storage module realizes the storage of data; the core processor realizes the processing of data; and the transmission module realizes the transmission of logarithms. The core processor adopts an MCU chip, the full name of which is Micro Control Unit in English; the Chinese name is micro control unit, also known as single chip microcomputer (Single Chip Microcomputer) or single chip microcomputer.

[0043] Preferably, in the above-mentioned intelligent testing device for mechanical properties of wood components, the display instrument 7 adopts a touch screen, which can not only output data through the touch screen, but also input data through the touch screen.

[0044] In summary, on the one hand, the present invention can measure the moisture content W of the wood component, the resistance value F of the probe penetrating into the wood component, and the depth h of the probe penetrating into the wood component by holding the intelligent testing device for mechanical properties of the wood component in hand, and calculate the density ρ of the wood component, the stress wave velocity v of the wood component, and the mechanical properties of the wood component (including the elastic modulus E of the wood component and the bending strength σ of the wood component) b ), compared with traditional micro-drill resistance meters and stress wave equipment, the equipment is simple and light, and on-site operation is more convenient and faster.

[0045] On the other hand, the present invention holds the intelligent testing device for mechanical properties of wood components by hand, and simultaneously inserts two probes 1 vertically into the wood components 11, and simultaneously measures the moisture content value W of the wood components, the resistance value F of the probes penetrating into the wood components, and the depth h of the probes penetrating into the wood components, and calculates the density ρ of the wood components, the stress wave velocity v of the wood components, the elastic modulus E of the wood components, and the bending strength σ of the wood components. b These mechanical properties of wood, while traditionally, multiple devices are needed to test the density ρ of the wood component, the stress wave velocity v of the wood component and the moisture content value W of the wood component respectively, which will cause multiple damages to the wood component 11. The present invention only needs to insert the wood once, and the insertion depth of the probe 1 is shallow, and there is no requirement for the penetration depth, which causes less damage to the wood component 11 and realizes micro-damage detection.

[0046] On the other hand, the present invention integrates various sensors, and obtains the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component by quickly inserting the probe 1 into the wood component. The functional relationship between the resistance value F of the probe penetrating into the wood component, the depth h of the probe penetrating into the wood component and the density ρ of the wood component, the functional relationship between the stress wave velocity v of the wood component and the moisture content value W of the wood component, and the relationship between the resistance value F of the probe penetrating into the wood component, the density ρ of the wood component and the stress wave velocity v of the wood component are utilized. The stress wave velocity v of the wood component is calculated by testing the moisture content value W of the wood component, and there is no need for a separate stress wave device to knock. The density ρ of the wood component is calculated by the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component, and there is no need for continuous drilling operation. It has the characteristics of high efficiency, speed and low price, and can save manpower, economic and time costs.

[0047] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An intelligent testing device for mechanical properties of wood components, characterized in that: The invention comprises two probes, a mechanical sensor, a moisture sensor, a laser distance measuring sensor, an integrated circuit board, a power supply module, a display instrument and an insulating shell. The mechanical sensor, the moisture sensor, the integrated circuit board and the power supply module are respectively located inside the insulating shell. The display instrument is arranged on the outer surface of the insulating shell. The two probes are arranged in parallel. One end of the probe is arranged inside the insulating shell. The other end of the probe is provided with a conical needle tip and is located outside the insulating shell. The mechanical sensor is arranged on the end of one of the probes located inside the insulating shell. The two probes are respectively connected to the two ends of the moisture sensor. The laser distance measuring sensor is arranged on the insulating shell between the two probes. The laser direction of the laser distance measuring sensor is parallel to the length direction of the probe. The transmitting end and The receiving ends are flush with the outer surface of the insulating shell, and the integrated circuit board is respectively connected to the mechanical sensor, the moisture content sensor, the laser ranging sensor, the power supply module and the display instrument; when the two probes penetrate into the wood component, the moisture content W of the wood component can be measured by the moisture content sensor, and the resistance value F of the probe penetrating into the wood component can be obtained by the mechanical sensor; the depth h of the probe penetrating into the wood component can be obtained by the laser ranging sensor; the integrated circuit board can calculate the stress wave velocity v of the wood component according to the functional relationship between the stress wave velocity v of the wood component and the moisture content W of the wood component; the density ρ of the wood component can be calculated according to the functional relationship between the ratio of the resistance value F of the probe penetrating into the wood component and the depth h of the probe penetrating into the wood component and the density ρ of the wood component; the product ρv of the square of the stress wave velocity v of the wood component and the density ρ of the wood component is obtained. 2 The functional relationship between the elastic modulus E of the wood component and the wood component can be used to obtain the elastic modulus E of the wood component; according to the product of the square of the stress wave velocity v of the wood component and the density ρ of the wood component, ρv 2 The bending strength of wood components b The functional relationship of b The functional relationship between the ratio of the resistance value F of the probe piercing the wood component to the depth h of the probe piercing the wood component and the density ρ of the wood component is obtained by deep learning fitting or regression analysis fitting. The functional relationship between the ratio F / h of the resistance value F of the probe piercing the wood component to the depth h of the probe piercing the wood component and the density ρ of the wood component is ρ=0.0779 F / h+0.0021. The functional relationship between the stress wave velocity v of the wood component and the moisture content W of the wood component is obtained by deep learning fitting or regression analysis fitting. The functional relationship between the stress wave velocity v of the wood component and the moisture content W of the wood component is v=0.2915 W^2-33.508W+5191.

6. The integrated circuit board measures the resistance R between the two probes piercing the wood component through the moisture content sensor, and uses the functional formula of moisture content and resistance: W= , obtain the moisture content W of the wood component.

2. The intelligent testing device for mechanical properties of wood components according to claim 1, characterized in that: The integrated circuit board is based on the product ρv of the square of the stress wave velocity v of the wood component and the density ρ of the wood component. 2 Function formula of elastic modulus E of wood component: E=ρv 2 , and obtain the elastic modulus E of the wood component; the integrated circuit board is based on the product ρv of the square of the stress wave velocity v of the wood component and the density ρ of the wood component 2 The bending strength of wood components b Function formula: σ b = -0.0018 ρv 2 + 90.172, the bending strength of the wood member σ b .

3. The intelligent testing device for mechanical properties of wood components according to claim 1, characterized in that: When the probe tip is inserted into the interior of the wood component, the line connecting the insertion points of the two probes on the surface of the wood component is parallel to the grain direction of the wood component.

4. The intelligent testing device for mechanical properties of wood components according to claim 1, characterized in that: The laser ranging sensor can obtain the depth h of the probe penetrating into the wooden component, including directly measuring the distance between the wooden component and the insulating shell when the probe penetrates into the wooden component by the laser ranging sensor, and the integrated circuit board obtains the depth h of the probe penetrating into the wooden component by subtracting the distance between the wooden component and the insulating shell when the probe penetrates into the wooden component from the total length of the probe outside the insulating shell.

5. The intelligent testing device for mechanical properties of wood components according to claim 1, characterized in that: The two ends of the moisture sensor are respectively provided with holes for one end of the probe to pass through, and the rod section of the probe located inside the insulating shell is provided with external threads. One end of the two probes respectively passes through the corresponding holes on the moisture sensor and is fixed with two first nuts respectively.

6. The intelligent testing device for mechanical properties of wood components according to claim 1, characterized in that: The integrated circuit board includes a core processor, an acquisition module, a transmission module and a storage module. The acquisition module, the transmission module and the storage module are respectively connected to the core processor, and the acquisition module is respectively connected to a mechanical sensor, a moisture content sensor and a laser ranging sensor.

7. The intelligent testing device for mechanical properties of wood components according to claim 1, characterized in that: The display instrument adopts a touch display screen.

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