CN114413829A - Online detection device and method for wood surface drying shrinkage strain - Google Patents
Online detection device and method for wood surface drying shrinkage strain Download PDFInfo
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- CN114413829A CN114413829A CN202210315332.3A CN202210315332A CN114413829A CN 114413829 A CN114413829 A CN 114413829A CN 202210315332 A CN202210315332 A CN 202210315332A CN 114413829 A CN114413829 A CN 114413829A
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Abstract
The invention relates to the technical field of wood detection, which aims at the defects that the traditional mode for detecting the wood drying shrinkage strain has limitation and cannot calculate trend data of volume reduction of different woods when water content gradually descends in real time, in particular to an online detection device and a method for the wood surface drying shrinkage strain, wherein the online detection device comprises a shell, a first horizontal distance measuring mechanism and a second horizontal distance measuring mechanism, the first horizontal distance measuring mechanism and the second horizontal distance measuring mechanism are both arranged on the top surface of a bottom box, and a drying mechanism, the drying mechanism is arranged in the bottom box, and the output end of the drying mechanism is positioned on the top surface of the bottom box; the thickness ranging mechanism is arranged on the top cover; and timber moisture tester, timber moisture tester sets up in the inside of end box, and the output of timber moisture tester runs through end box top surface, can test the data of different timber when the dry shrinkage meets an emergency through this application, can also know timber and dry shrinkage under different time lines and different temperatures meets an emergency difference.
Description
Technical Field
The invention relates to the technical field of wood detection, in particular to an online detection device and method for wood surface drying shrinkage strain.
Background
Wood is a lignified tissue formed by plants capable of secondary growth, such as trees and shrubs. After the primary growth of the plants is finished, the vascular formation layer in the rootstocks starts to move, so that phloem is developed outwards, and wood is developed inwards;
wood is a generic term for the development of plant tissue inward of the vascular cambium, including xylem and parenchymal rays. Wood plays a great supporting role in human life. Wood is used in different ways according to its different properties.
As a moisture-absorbing porous material, wood is dried and shrunk as one of the main characteristics in the wood drying process, and is also an important factor influencing wood processing. The phenomenon of dry shrinkage mainly occurs when the moisture content of the wood is reduced below a fiber saturation point, so that the size and the volume of the wood are changed, and the existence of the dry shrinkage difference of different texture directions and wood parts can cause larger drying stress, so that the drying defects of deformation, cracking and the like are generated, and the efficient processing and utilization of the wood are seriously restricted. Therefore, the online accurate detection of the drying shrinkage strain in the wood drying process is particularly important.
The dry shrinkage strain can be used as an index to evaluate dimensional stability during wood drying. Which can be determined by conventional slicing and strain gauge methods. In the slicing method, since contact measurement is performed by a vernier caliper or a micrometer, a manual measurement error is inevitably generated, and there is a certain requirement for the size of a specimen. In the strain gauge method, perfect bonding between the strain gauge and the sample is critical. In addition, the use temperature and relative humidity also have a great influence on the test results. In addition, in order to improve the measurement accuracy and visualize the drying shrinkage process of wood, some non-contact optical measurement methods (e.g., digital image correlation and near infrared spectroscopy) have been used to determine the drying shrinkage strain. However, the optical method requires real-time image acquisition in the wood drying process, which leads to limitation on further popularization, and the existing online detection method for wood drying shrinkage strain is mainly a sensor method, but the sensor belongs to a sensitive element, the sensor needs to be adhered to the surface of the wood during testing, the testing result is greatly influenced by the temperature and humidity conditions of the use environment, the roughness of the adhered surface of the wood, the curing degree of the used adhesive and other factors, and the use of the sensor in special drying modes such as high temperature, high pressure, high frequency vacuum and the like is also limited.
However, the traditional method for detecting the wood dry shrinkage strain has limitations, and cannot calculate trend data of volume reduction of different woods when water content gradually decreases in real time, so that an online detection device and method for the wood surface dry shrinkage strain need to be provided for solving the problem.
Disclosure of Invention
To solve the above technical problems.
The application provides an online detection device for wood surface drying shrinkage strain, which comprises a shell, wherein the shell consists of a bottom box and a top cover, and the top surface of the bottom box is provided with a right-angle stop block; the first horizontal distance measuring mechanism and the second horizontal distance measuring mechanism are arranged on the top surface of the bottom box and are respectively arranged on the adjacent lines of the opposite angles of the right-angle stop block; the drying mechanism is arranged in the bottom box, and the output end of the drying mechanism is positioned on the top surface of the bottom box; the thickness ranging mechanism is arranged on the top cover; and the wood moisture tester is arranged in the bottom box, and the output end of the wood moisture tester penetrates through the top surface of the bottom box.
Preferably, the top symmetry of top cap is equipped with the bleeder vent, and the lateral wall of top cap is equipped with the observation window, and the outside symmetry of top cap is equipped with the buckle, and thickness ranging mechanism sets up in the interior top of top cap.
Preferably, the first horizontal distance measuring mechanism comprises a propelling mechanism, the propelling mechanism is arranged in the bottom box, and the output end of the propelling mechanism is positioned on the top surface of the bottom box; the first distance measuring plate is symmetrically provided with first guide rods, and the first guide rods are connected with the output end of the propelling mechanism in a sliding manner; one end of the first spring is connected with the first distance measuring plate, and the other end of the first spring is connected with the first distance measuring plate; and the first sensor is arranged at the output end of the propelling mechanism, and the output end of the first sensor faces the first distance measuring plate.
Preferably, the pushing mechanism comprises a first sliding plate, and the first sliding plate penetrates through the top surface of the bottom box and is connected with the bottom box in a sliding manner; and the first threaded rod is arranged in the bottom box and is rotatably connected with the bottom box, and the first threaded rod is in threaded connection with the first sliding plate.
Preferably, the pushing mechanism comprises a second sliding plate, the second sliding plate penetrates through the top surface of the bottom box and is in sliding connection with the bottom box, and two sliding grooves are formed in the second sliding plate; the top end of the protruding tooth sheet is movably connected with one sliding chute of the second sliding plate; the sliding ring is arranged in the other sliding chute of the second sliding plate and is in sliding connection with the sliding chute, and the bottom end of the protruding tooth sheet is hinged with the sliding ring; and a screw rod for limiting the position of the sliding ring; and a torsion spring for springing the protruding tooth sheet; the rack is arranged on the inner top surface of the bottom box.
Preferably, the drying mechanism comprises a first air outlet head and a second air outlet head, and the first air outlet head and the second air outlet head are arranged on the top surface of the bottom box; and the hot air output assembly is arranged in the bottom box, and the output end of the hot air output assembly is connected with the first air outlet head and the second air outlet head through pipelines respectively.
Preferably, the hot air output assembly comprises an air pipe, the air pipe is arranged inside the bottom box, and one end of the air pipe is respectively connected with the first air outlet head and the second air outlet head through pipelines; the servo motor is arranged at the other end of the air pipe; the fan blade is arranged at the output end of the servo motor and is positioned inside the air pipe; and the electric heating element is arranged inside the air pipe.
Preferably, the thickness ranging mechanism comprises a pressing driving assembly, and the pressing driving assembly is arranged at the inner top of the top cover; the second distance measuring plate is symmetrically provided with second guide rods, and the second guide rods penetrate through the output end of the lower pressing driving assembly and are in sliding connection with the output end of the lower pressing driving assembly; the second spring is sleeved on the second distance measuring plate, one end of the second spring abuts against the output end of the lower pressing driving assembly, and the other end of the second spring abuts against the second distance measuring plate; and the second sensor is arranged at the output end of the pressing driving component, and the output end of the second sensor faces the second distance measuring plate.
Preferably, the lower pressing driving assembly comprises a longitudinal moving plate, limiting rods are symmetrically arranged on the longitudinal moving plate, the limiting rods penetrate through the top surface of the top cover and are in sliding connection with the top surface of the top cover, and the second guide rods penetrate through the longitudinal moving plate and are in sliding connection with the top surface of the longitudinal moving plate; and the second threaded rod penetrates through the top surface of the top cover and is in threaded connection with the top surface of the top cover, and the bottom end of the second threaded rod is rotatably connected with the top of the longitudinal moving plate.
The implementation method of the online detection device for the wood surface drying shrinkage strain comprises the following steps:
firstly, a worker places a wood block on the top surface of a bottom box, so that one corner of the wood block is positioned at the included angle of a right-angle stop block, and the output end of a wood moisture tester is inserted into a fixed corner of the wood block;
secondly, the worker drives the first distance measuring plate to be close to the surface of the wood block through the propelling mechanism until the output end of the first sensor is in contact with the first distance measuring plate, and the first horizontal distance measuring mechanism and the second horizontal distance measuring mechanism limit the wood block to be positioned at two vertical surfaces at opposite angles of the right-angle stop block;
step three, when the worker installs the top cover on the top of the bottom box, the second distance measuring plate is located above the wood block, and the worker drives the second distance measuring plate to descend through the pressing driving assembly until the output end of the second sensor contacts the second distance measuring plate;
outputting hot air from the first air outlet head and the second air outlet head to a working space formed by the bottom box and the top cover by the hot air output assembly through a pipeline, and performing dry shrinkage on the wood block by the hot air;
step five, in the drying process, the position of the output end of the propelling mechanism is not changed any more, the volume of the wood block is reduced, the first spring pushes the first distance measuring plate to be always attached to the surface of the wood block, the distance of displacement of the first distance measuring plate is measured by the first sensor, and the first horizontal distance measuring mechanism and the second horizontal distance measuring mechanism send data to the industrial computer in real time;
step six, when the wood block is in dry shrinkage, the position of the output end of the downward pressing driving assembly is unchanged, the second distance measuring plate is always attached to the top surface of the wood block under the action of a second spring, and the data of the displacement change of the second distance measuring plate are sent to the industrial computer by a second sensor in real time;
and seventhly, the staff can know the speed curve condition of the dry shrinkage strain in real time.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the wood drying shrinkage strain testing device, the shell, the first horizontal distance measuring mechanism, the second horizontal distance measuring mechanism, the drying mechanism, the thickness distance measuring mechanism and the wood moisture tester can be used for testing data of different woods during drying shrinkage strain, and the difference of the drying shrinkage strain of the woods at different time lines and different temperatures can be known;
2. this application is through the setting of first horizontal ranging mechanism and thickness ranging mechanism, can carry out real-time recording to the volume change when timber shrinkages.
Drawings
FIG. 1 is a first schematic perspective exploded view of the present invention;
FIG. 2 is a front view of the exploded structure of the present invention;
FIG. 3 is a schematic perspective view of the present invention;
FIG. 4 is a schematic perspective view of the bottom case, the first horizontal distance measuring mechanism, the second horizontal distance measuring mechanism and the drying mechanism according to the present invention;
FIG. 5 is an enlarged view of FIG. 4 at A;
FIG. 6 is a schematic perspective exploded view of the bottom case, the first horizontal ranging mechanism, the second horizontal ranging mechanism and the drying mechanism of the present invention;
FIG. 7 is an enlarged view of FIG. 6 at B;
FIG. 8 is a side view of the hot air delivery assembly of the present invention;
FIG. 9 is a cross-sectional view taken along line C-C of FIG. 8;
FIG. 10 is a front view of the thickness ranging mechanism of the present invention;
FIG. 11 is a side view of the present invention;
fig. 12 is a sectional view taken along the direction D-D of fig. 11.
The reference numbers in the figures are:
1-a housing; 1 a-bottom box; 1a 1-right angle block; 1 b-a top cover; 1b 1-vent; 1b2 — observation window; 1b 3-snap;
2-a first horizontal ranging mechanism; 2 a-a propulsion mechanism; 2a 1-first sliding panel; 2a2 — first threaded rod; 2a 3-a second slider plate; 2a 4-tabbed; 2a5 — slip ring; 2a 6-screw bar; 2a 7-torsion spring; 2a 8-rack; 2 b-a first distance measuring plate; 2b1 — first guide bar; 2 c-a first spring; 2 d-a first sensor;
3-a second horizontal ranging mechanism;
4-a drying mechanism; 4 a-a first air outlet head; 4 b-a second air outlet head; 4 c-a hot air output assembly; 4c 1-air duct; 4c 2-servomotor; 4c 3-leaf; 4c 4-electric heating elements;
5-a thickness ranging mechanism; 5 a-a push down drive assembly; 5a 1-longitudinal movement plate; 5a 2-stop bar; 5a3 — second threaded rod; 5 b-a second distance measuring plate; 5b1 — second guide bar; 5 c-a second spring; 5 d-a second sensor;
6-timber moisture tester;
7-wood block.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
As shown in fig. 1, fig. 2, fig. 3 and fig. 6, the following preferred technical solutions are provided:
the online detection device for the wood surface drying shrinkage strain comprises a shell 1, wherein the shell 1 consists of a bottom box 1a and a top cover 1b, and the top surface of the bottom box 1a is provided with a right-angle stop block 1a 1; the first horizontal distance measuring mechanism 2 and the second horizontal distance measuring mechanism 3 are arranged on the top surface of the bottom box 1a, and the first horizontal distance measuring mechanism 2 and the second horizontal distance measuring mechanism 3 are respectively arranged on the diagonal adjacent lines of the right-angle stop block 1a 1; the drying mechanism 4 is arranged inside the bottom box 1a, and the output end of the drying mechanism 4 is positioned on the top surface of the bottom box 1 a; the thickness ranging mechanism 5 is arranged on the top cover 1 b; the wood moisture tester 6 is arranged inside the bottom box 1a, and the output end of the wood moisture tester 6 penetrates through the top surface of the bottom box 1 a;
specifically, in order to solve the technical problem of detecting the wood shrinkage condition on line, the measurement object of the device is required to be a rectangular wood block, and the measurement calculation of the volume needs to be performed in advance before the measurement, firstly, a worker places the wood block on the top surface of the bottom box 1a, so that one corner of the wood block is positioned at the included angle of the right-angle block 1a1, the two adjacent vertical surfaces of the wood block at the right-angle block 1a1 are limited, the output end of the wood moisture tester 6 is inserted into the fixed corner of the wood block, then the worker drives the first horizontal distance measuring mechanism 2 and the second horizontal distance measuring mechanism 3 in sequence, the wood block is limited at the two vertical surfaces at the opposite corners of the right-angle block 1a1 by the first horizontal distance measuring mechanism 2 and the second horizontal distance measuring mechanism 3, the position of the wood block is limited, then the worker buckles the top cover 1b on the top of the bottom box 1a, and drives the output end of the thickness distance measuring mechanism 5 to be close to the top surface of the wood block, first horizontal ranging mechanism 2, open stoving mechanism 4 after three measuring module of second horizontal ranging mechanism 3 and thickness ranging mechanism 5 is ready, stoving mechanism 4 inputs hot-blast to the space that end box 1a and top cover 1b are constituteed, record the stoving temperature through setting up temperature sensor, the billet constantly begins to shrink after receiving dry hot-blast, at the in-process of shrink, first horizontal ranging mechanism 2, the output of second horizontal ranging mechanism 3 and thickness ranging mechanism 5 moves along with the surface that contacts, and transmit the distance change to industrial computer in real time, the staff can directly observe the wood dry shrinkage strain condition under multiple temperature on line, and know the speed curve condition of meeting an emergency.
As shown in fig. 3, the following preferred technical solutions are provided:
the top of the top cover 1b is symmetrically provided with air holes 1b1, the side wall of the top cover 1b is provided with an observation window 1b2, the outer part of the top cover 1b is symmetrically provided with buckles 1b3, and the thickness ranging mechanism 5 is arranged at the inner top of the top cover 1 b;
specifically, in order to solve the technical problems of configuring the thickness measuring mechanism 5 and creating a heating space, a worker covers the top cover 1b on the top of the bottom box 1a and connects the top cover 1b with the bottom box 1a through the fasteners 1b3 on both sides of the top cover 1b, so that the thickness measuring mechanism 5 can be simultaneously observed through the observation window 1b2 during blending, and moist air is exhausted through the air holes 1b1 during drying and heating to keep the interior of the thickness measuring mechanism dry.
As shown in fig. 4 and 5, the following preferred technical solutions are provided:
the first horizontal distance measuring mechanism 2 comprises a propelling mechanism 2a, the propelling mechanism 2a is arranged in the bottom box 1a, and the output end of the propelling mechanism 2a is positioned on the top surface of the bottom box 1 a; the first distance measuring plate 2b is symmetrically provided with first guide rods 2b1, and the first guide rods 2b1 are connected with the output end of the propelling mechanism 2a in a sliding manner; one end of the first spring 2c is connected with the first distance measuring plate 2b, and the other end of the first spring 2c is connected with the first distance measuring plate 2 b; and a first sensor 2d, the first sensor 2d is arranged at the output end of the propelling mechanism 2a, and the output end of the first sensor 2d faces the first distance measuring plate 2 b;
concretely, in order to solve the technical problem who carries out the record to timber shrinkage process, first sensor 2d is distance sensor, the staff is close to the surface of billet through the first range finding board 2b of advancing mechanism 2a drive, until the output of first sensor 2d and the contact of first range finding board 2b, in the drying process, the output position of advancing mechanism 2a no longer changes, the volume of billet reduces, first spring 2c promotes first range finding board 2b and hugs closely the billet surface all the time, the distance that first range finding board 2b appears the displacement is surveyed out through first sensor 2d and is sent industrial computer, first guide bar 2b1 is used for guiding the moving direction of first range finding board 2 b.
As shown in fig. 6, the following preferred technical solutions are provided:
the pushing mechanism 2a comprises a first sliding plate 2a1, the first sliding plate 2a1 penetrates the top surface of the bottom box 1a and is connected with the bottom box in a sliding way; the first threaded rod 2a2, the first threaded rod 2a2 is arranged inside the bottom box 1a and is rotatably connected with the bottom box, and the first threaded rod 2a2 is in threaded connection with the first sliding plate 2a 1;
specifically, in order to solve the technical problem of recording the wood drying process, the worker twists the first threaded rod 2a2, drives the first sliding plate 2a1 to move through the first threaded rod 2a2, and the first sliding plate 2a1 drives the first distance measuring plate 2b to be close to the surface of the wood block until the output end of the first sensor 2d contacts with the first distance measuring plate 2 b.
As shown in fig. 7, the following preferred technical solutions are provided:
the pushing mechanism 2a comprises a second sliding plate 2a3, the second sliding plate 2a3 penetrates through the top surface of the bottom box 1a and is connected with the bottom box in a sliding manner, and two sliding grooves are arranged on the second sliding plate 2a 3; the top end of the protruding tooth piece 2a4 is movably connected with one sliding groove of the second sliding plate 2a 3; the sliding ring 2a5, the sliding ring 2a5 is arranged in the other sliding groove of the second sliding plate 2a3 and is connected with the other sliding groove in a sliding manner, and the bottom end of the protruding tooth piece 2a4 is hinged with the sliding ring 2a 5; and a screw bar 2a6 for restricting the position of the slide ring 2a 5; and a torsion spring 2a7 for springing the projecting tooth piece 2a 4; the rack 2a8, the rack 2a8 is arranged on the inner top surface of the bottom box 1 a;
specifically, in order to solve the technical problem of recording the wood drying and shrinking process, a worker pulls the second sliding plate 2a3, the first sliding plate 2a1 is driven to move through the second sliding plate 2a3, the first sliding plate 2a1 drives the first distance measuring plate 2b to be close to the surface of the wood block, the protruding tooth piece 2a4 is arranged in a one-side steering mode, the reverse displacement of the second sliding plate 2a3 is limited through the meshing of the rack 2a8 and the protruding tooth piece 2a4, the protruding tooth piece 2a4 can be quickly meshed with the rack 2a8 through the arrangement of the torsion spring 2a7, and the position of the sliding ring 2a5 and then the position of the protruding tooth piece 2a4 can be controlled through screwing and unscrewing the screwing rod 2a 6.
As shown in fig. 6, the following preferred technical solutions are provided:
the drying mechanism 4 comprises a first air outlet head 4a and a second air outlet head 4b, and the first air outlet head 4a and the second air outlet head 4b are arranged on the top surface of the bottom box 1 a; the hot air output assembly 4c is arranged inside the bottom box 1a, and the output end of the hot air output assembly 4c is respectively connected with the first air outlet head 4a and the second air outlet head 4b through pipelines;
specifically, in order to solve the technical problem of carrying out the dry shrinkage to timber, drying mechanism 4 begins work, and hot-blast output assembly 4c begins to output hot-blastly, and hot-blastly output assembly 4c exports hot-blastly from first play wind head 4a and second play wind head 4b through the pipeline and exports to the workspace that end box 1a and overhead guard 1b are constituteed, carries out the dry shrinkage effect to the billet through hot-blastly.
As shown in fig. 8 and 9, the following preferred solutions are provided:
the hot air output assembly 4c comprises an air pipe 4c1, the air pipe 4c1 is arranged inside the bottom box 1a, and one end of the air pipe 4c1 is respectively connected with the first air outlet head 4a and the second air outlet head 4b through pipelines; the servo motor 4c2, the servo motor 4c2 is arranged at the other end of the air duct 4c 1; the fan blade 4c3, the fan blade 4c3 is arranged at the output end of the servo motor 4c2 and is positioned inside the air duct 4c 1; and an electric heating element 4c4, the electric heating element 4c4 is arranged inside the air pipe 4c 1;
specifically, in order to solve the technical problem of drying and shrinking wood, the hot air output assembly 4c starts to work, the electric heating element 4c4 is powered on and starts to generate heat, the output end of the servo motor 4c2 drives the fan blades 4c3 to rotate to generate air flow, the air flow conveys hot air generated by heating of the electric heating element 4c4 through the guide of the air pipe 4c1, and the hot air is conveyed into a working space formed by the bottom box 1a and the top cover 1b through a pipeline and finally through the first air outlet head 4a and the second air outlet head 4 b.
As shown in fig. 10, 11 and 12, the following preferred technical solutions are provided:
the thickness ranging mechanism 5 comprises a downward pressing driving component 5a, and the downward pressing driving component 5a is arranged at the inner top of the top cover 1 b; the second distance measuring plate 5b is symmetrically provided with second guide rods 5b1, and the second guide rods 5b1 penetrate through the output end of the lower pressing driving component 5a and are connected with the output end in a sliding manner; the second spring 5c is sleeved on the second distance measuring plate 5b, one end of the second spring 5c props against the output end of the lower pressing driving assembly 5a, and the other end of the second spring 5c props against the second distance measuring plate 5 b; the second sensor 5d is arranged at the output end of the pressing driving component 5a, and the output end of the second sensor 5d faces the second distance measuring plate 5 b;
specifically, in order to solve the technical problem of recording the wood dry-shrinkage process, the second sensor 5d is a contact sensor, when a worker installs the top cover 1b on the top of the bottom box 1a, the second distance measuring plate 5b is located above the wood block, the worker drives the second distance measuring plate 5b to descend through the pressing driving assembly 5a until the output end of the second sensor 5d contacts the second distance measuring plate 5b, when the wood block is in dry-shrinkage, the position of the output end of the pressing driving assembly 5a is unchanged, the second distance measuring plate 5b is always attached to the top surface of the wood block under the action of the second spring 5c, the second sensor 5d sends the displacement change data of the second distance measuring plate 5b to an industrial computer in real time, and the second guide rod 5b1 is used for guiding the moving direction of the second distance measuring plate 5 b.
As shown in fig. 12, the following preferred technical solutions are provided:
the lower pressing driving assembly 5a comprises a longitudinal moving plate 5a1, limiting rods 5a2 are symmetrically arranged on the longitudinal moving plate 5a1, the limiting rods 5a2 penetrate through the top surface of the top cover 1b and are in sliding connection with the top surface, and the second guide rods 5b1 penetrate through the longitudinal moving plate 5a1 and are in sliding connection with the top surface; the second threaded rod 5a3, the second threaded rod 5a3 penetrates through the top surface of the top cover 1b and is in threaded connection with the top cover, and the bottom end of the second threaded rod 5a3 is rotatably connected with the top of the longitudinal moving plate 5a 1;
specifically, in order to solve the technical problem of recording the wood drying and shrinking process, a worker screws the second threaded rod 5a3, the second threaded rod 5a3 rotates and drives the longitudinal moving plate 5a1 to descend until the output end of the second sensor 5d contacts the second distance measuring plate 5b, and the limiting rod 5a2 is used for guiding the moving direction of the longitudinal moving plate 5a 1.
The implementation method of the online detection device for the wood surface drying shrinkage strain comprises the following steps:
firstly, a worker places a wood block on the top surface of a bottom box 1a, so that one corner of the wood block is positioned at the included angle of a right-angle block 1a1, and the output end of a wood moisture tester 6 is inserted into a fixed corner of the wood block;
secondly, the worker drives the first distance measuring plate 2b to be close to the surface of the wood block through the propelling mechanism 2a until the output end of the first sensor 2d is contacted with the first distance measuring plate 2b, and the wood block is limited by two vertical surfaces at the opposite angles of the right-angle stop block 1a1 through the first horizontal distance measuring mechanism 2 and the second horizontal distance measuring mechanism 3;
step three, when the worker installs the top cover 1b on the top of the bottom box 1a, the second distance measuring plate 5b is located above the wood block, and the worker drives the second distance measuring plate 5b to descend through the pressing driving assembly 5a until the output end of the second sensor 5d contacts the second distance measuring plate 5 b;
step four, the hot air output assembly 4c starts to output hot air, the hot air output assembly 4c outputs the hot air from the first air outlet head 4a and the second air outlet head 4b to a working space formed by the bottom box 1a and the top cover 1b through a pipeline, and the wood blocks are subjected to drying shrinkage through the hot air;
step five, in the drying process, the position of the output end of the propelling mechanism 2a is not changed any more, the volume of the wood block is reduced, the first spring 2c pushes the first distance measuring plate 2b to be always attached to the surface of the wood block, the distance of displacement of the first distance measuring plate 2b is measured and calculated through the first sensor 2d, and the first horizontal distance measuring mechanism 2 and the second horizontal distance measuring mechanism 3 send data to an industrial computer in real time;
step six, when the wood block is in dry shrinkage, the position of the output end of the downward pressing driving component 5a is unchanged, the second distance measuring plate 5b is always attached to the top surface of the wood block under the action of the second spring 5c, and data of displacement change of the second distance measuring plate 5b are sent to the industrial computer by the second sensor 5d in real time;
and seventhly, the staff can know the speed curve condition of the dry shrinkage strain in real time.
This application passes through shell 1, first horizontal ranging mechanism 2, second horizontal ranging mechanism 3, stoving mechanism 4, thickness ranging mechanism 5 and timber moisture tester 6, can test the data of different timber when the dry shrinkage meets an emergency, can also know timber and contract an emergency difference at the dry shrinkage under different time lines and different temperatures, through the setting of first horizontal ranging mechanism 2 and thickness ranging mechanism 5, volume change when can drying shrinkage to timber carries out real-time recording.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The online detection device for the wood surface drying shrinkage strain is characterized by comprising a shell (1), wherein the shell (1) consists of a bottom box (1 a) and a top cover (1 b), and the top surface of the bottom box (1 a) is provided with a right-angle stop block (1 a 1); and
the first horizontal distance measuring mechanism (2) and the second horizontal distance measuring mechanism (3) are arranged on the top surface of the bottom box (1 a), and the first horizontal distance measuring mechanism (2) and the second horizontal distance measuring mechanism (3) are respectively arranged on the adjacent lines of the opposite angles of the right-angle stop block (1 a 1); and
the drying mechanism (4), the drying mechanism (4) is arranged inside the bottom box (1 a), and the output end of the drying mechanism (4) is positioned on the top surface of the bottom box (1 a); and
the thickness ranging mechanism (5), the thickness ranging mechanism (5) is arranged on the top cover (1 b); and
the wood moisture tester (6), the wood moisture tester (6) is arranged inside the bottom box (1 a), and the output end of the wood moisture tester (6) penetrates through the top surface of the bottom box (1 a);
the top of the top cover (1 b) is symmetrically provided with air holes (1 b 1), the side wall of the top cover (1 b) is provided with an observation window (1 b 2), the outer part of the top cover (1 b) is symmetrically provided with buckles (1 b 3), and the thickness ranging mechanism (5) is arranged at the inner top of the top cover (1 b);
the first horizontal distance measuring mechanism (2) comprises a propelling mechanism (2 a), the propelling mechanism (2 a) is arranged in the bottom box (1 a), and the output end of the propelling mechanism (2 a) is positioned on the top surface of the bottom box (1 a); and
the first distance measuring plate (2 b) is symmetrically provided with first guide rods (2 b 1), and the first guide rods (2 b 1) are connected with the output end of the propelling mechanism (2 a) in a sliding manner; and
one end of the first spring (2 c) is connected with the first distance measuring plate (2 b), and the other end of the first spring (2 c) is connected with the first distance measuring plate (2 b); and
the first sensor (2 d), the first sensor (2 d) is set up in the carry-out terminal of the propulsion mechanism (2 a), the carry-out terminal of the first sensor (2 d) faces the first range finding board (2 b);
the pushing mechanism (2 a) comprises a second sliding plate (2 a 3), the second sliding plate (2 a 3) penetrates through the top surface of the bottom box (1 a) and is in sliding connection with the top surface, and two sliding grooves are formed in the second sliding plate (2 a 3); and
the top end of the protruding tooth piece (2 a 4) is movably connected with one sliding groove of the second sliding plate (2 a 3); and
the sliding ring (2 a 5), the sliding ring (2 a 5) is arranged in the other sliding groove of the second sliding plate (2 a 3) and is connected with the other sliding groove in a sliding manner, and the bottom end of the protruding tooth piece (2 a 4) is hinged with the sliding ring (2 a 5); and
a screw bar (2 a 6) for limiting the position of the sliding ring (2 a 5); and
a torsion spring (2 a 7) for springing the tab (2 a 4);
and the rack (2 a 8) is arranged on the inner top surface of the bottom box (1 a) and the rack (2 a 8).
2. The online detection device for wood surface drying shrinkage strain according to claim 1, wherein the pushing mechanism (2 a) comprises a first sliding plate (2 a 1), the first sliding plate (2 a 1) penetrates through the top surface of the bottom box (1 a) and is connected with the bottom box in a sliding way; and
the first threaded rod (2 a 2), the first threaded rod (2 a 2) is arranged in the bottom box (1 a) and is rotatably connected with the bottom box, and the first threaded rod (2 a 2) is in threaded connection with the first sliding plate (2 a 1).
3. The online detection device for the drying shrinkage strain on the surface of the wood according to claim 2, wherein the drying mechanism (4) comprises a first air outlet head (4 a) and a second air outlet head (4 b), and the first air outlet head (4 a) and the second air outlet head (4 b) are arranged on the top surface of the bottom box (1 a); and
hot-blast output subassembly (4 c), hot-blast output subassembly (4 c) set up in the inside of end box (1 a), and the output of hot-blast output subassembly (4 c) passes through the pipeline and is connected with first play wind head (4 a) and second play wind head (4 b) respectively.
4. The online detection device for wood surface drying shrinkage strain according to claim 3, wherein the hot air output assembly (4 c) comprises an air duct (4 c 1), the air duct (4 c 1) is disposed inside the bottom case (1 a), and one end of the air duct (4 c 1) is connected with the first air outlet head (4 a) and the second air outlet head (4 b) through pipelines respectively; and
the servo motor (4 c 2), the servo motor (4 c 2) is arranged at the other end of the air pipe (4 c 1); and
the fan blade (4 c 3), the fan blade (4 c 3) is arranged at the output end of the servo motor (4 c 2) and is positioned inside the air pipe (4 c 1); and
the electric heating element (4 c 4), the electric heating element (4 c 4) is arranged inside the air duct (4 c 1).
5. The online detection device for the dry shrinkage strain on the surface of the wood according to claim 4, wherein the thickness distance measuring mechanism (5) comprises a downward pressing driving component (5 a), and the downward pressing driving component (5 a) is arranged at the inner top of the top cover (1 b); and
the second distance measuring plate (5 b) is symmetrically provided with second guide rods (5 b 1), and the second guide rods (5 b 1) penetrate through the output end of the lower pressing driving assembly (5 a) and are in sliding connection with the output end of the lower pressing driving assembly; and
the second spring (5 c) is sleeved on the second distance measuring plate (5 b), one end of the second spring (5 c) abuts against the output end of the downward pressing driving assembly (5 a), and the other end of the second spring (5 c) abuts against the second distance measuring plate (5 b); and
and the second sensor (5 d) is arranged at the output end of the pressing driving component (5 a), and the output end of the second sensor (5 d) faces the second distance measuring plate (5 b).
6. The online detection device for the dry-shrinkage strain on the surface of the wood according to claim 5, wherein the lower pressing driving assembly (5 a) comprises a longitudinal moving plate (5 a 1), a limiting rod (5 a 2) is symmetrically arranged on the longitudinal moving plate (5 a 1), the limiting rod (5 a 2) penetrates through the top surface of the top cover (1 b) and is in sliding connection with the top surface, and a second guide rod (5 b 1) penetrates through the longitudinal moving plate (5 a 1) and is in sliding connection with the top surface; and
and the second threaded rod (5 a 3), the second threaded rod (5 a 3) penetrates through the top surface of the top cover (1 b) and is in threaded connection with the top surface, and the bottom end of the second threaded rod (5 a 3) is rotatably connected with the top of the longitudinal moving plate (5 a 1).
7. The implementation method of the online detection device for the drying shrinkage strain on the surface of the wood according to claim 6 is characterized by comprising the following steps:
firstly, a worker places a wood block on the top surface of a bottom box (1 a) so that one corner of the wood block is positioned at the included angle of a right-angle block (1 a 1), and the output end of a wood moisture tester (6) is inserted into a fixed angle of the wood block;
secondly, the worker drives the first distance measuring plate (2 b) to be close to the surface of the wood block through the propelling mechanism (2 a) until the output end of the first sensor (2 d) is contacted with the first distance measuring plate (2 b), and the wood block is limited by two vertical surfaces at the diagonal positions of the right-angle stop block (1 a 1) through the first horizontal distance measuring mechanism (2) and the second horizontal distance measuring mechanism (3);
step three, when a worker installs the top cover (1 b) on the top of the bottom box (1 a), the second distance measuring plate (5 b) is located above the wood block, and the worker drives the second distance measuring plate (5 b) to descend through the pressing driving assembly (5 a) until the output end of the second sensor (5 d) contacts the second distance measuring plate (5 b);
step four, the hot air output assembly (4 c) starts to output hot air, the hot air output assembly (4 c) outputs the hot air from the first air outlet head (4 a) and the second air outlet head (4 b) to a working space formed by the bottom box (1 a) and the top cover (1 b) through a pipeline, and the wood blocks are dried and shrunk through the hot air;
step five, in the drying process, the position of the output end of the propelling mechanism (2 a) is not changed any more, the volume of the wood block is reduced, the first spring (2 c) pushes the first distance measuring plate (2 b) to be always attached to the surface of the wood block, the distance of displacement of the first distance measuring plate (2 b) is measured and calculated through the first sensor (2 d), and the first horizontal distance measuring mechanism (2) and the second horizontal distance measuring mechanism (3) send data to an industrial computer in real time;
sixthly, when the wood block is in dry shrinkage, the position of the output end of the lower pressing driving component (5 a) is unchanged, the second distance measuring plate (5 b) is always attached to the top surface of the wood block under the action of a second spring (5 c), and data of displacement change of the second distance measuring plate (5 b) are sent to an industrial computer in real time by a second sensor (5 d);
and seventhly, the staff can know the speed curve condition of the dry shrinkage strain in real time.
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| CN112394101A (en) * | 2020-10-30 | 2021-02-23 | 中国林业科学研究院木材工业研究所 | Online detection method and device for wood surface drying shrinkage strain |
| CN214502345U (en) * | 2021-01-14 | 2021-10-26 | 陈春渊 | Deformation monitoring mechanism for wood drying |
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2022
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| JP2006226950A (en) * | 2005-02-21 | 2006-08-31 | Si Seiko Co Ltd | Timber inspection method and device |
| CN102621189A (en) * | 2012-02-27 | 2012-08-01 | 广东省宜华木业股份有限公司 | Method for measuring moisture content gradient in drying process of woods and measuring sensor used for the method |
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