Artificial board (plywood, MDF, OSB, BLOCKBOARD, LVL) testing>>Testing equipment
- Universal mechanical testing machine:
The universal mechanical testing machine mainly includes control systems, drive units, servo motors, gears, belts, crossbeam systems, functional accessories, and feedback devices. The control system sends a given signal and drives the motor through a power amplifier. The motor rotates to drive the gears and belts, causing the crossbeam to start moving. The feedback device feeds back the displacement signal of the crossbeam to the control system, and then compares it with the given signal in the control system to form a closed-loop control system. By configuring different functional accessories, mechanical indicators such as tensile strength, static bending strength, elastic modulus, grip force, internal bonding strength, surface bonding strength, bonding strength, and shear test of artificial board specimens with standard size and structure can be tested.
- Static bending strength testing equipment:
The static bending strength testing equipment mainly consists of support, pressure head, transmission mechanism, data acquisition system, computer control system, etc. During the experiment, load a specimen onto two supports, input the required parameters (length, width, and time) on the console, and then start the testing program. The experimental pressure head quickly moves from its original position until the proximity switch detects the specimen and drops to a constant speed to load the specimen. By measuring the load and corresponding deformation, the load deflection curve is obtained. The stiffness and elastic modulus can be calculated through the slope and displayed on the control console.
- Creep and deflection testing equipment:
The creep and deflection testing equipment mainly consists of support, pressure application device, transmission mechanism, data acquisition system, etc. Under constant external force, the strain of wood increases with time, which is called creep. Deflection refers to the vertical deformation of bending components such as beams and trusses under load. When considering whether a wood material is suitable for structural engineering, its creep property is an important factor. Wood creep is influenced by factors such as temperature, moisture content, loading method, stress level, variations in tree species and materials. The deflection is related to the size of the load, the cross-sectional size of the component, and the material physical properties of the component.
- Elastic modulus testing equipment:
The elastic modulus testing equipment is divided into three types according to the testing principle: first, the elastic non testing equipment based on the vibration method is mainly composed of a force hammer (with a force sensor on the head), an acceleration sensor, a charge amplifier, a four channel multi-function analyzer, etc. One end of the sample is fixed and the other end is free. From the graph of the first 5 modes of vibration of the cantilever beam, it can be seen that the free end is not a node, and the acceleration sensor can be fixed at the free end with paraffin. When the sample is struck with force hammer (the striking position is close to the fixed end), the signals generated by the force sensor and acceleration sensor on the force hammer enter the four channel multi-function analyzer through the charge amplifier, and the frequency response function analysis and modal analysis are carried out to obtain the natural frequency of the sample. Calculate the strength of the specimen based on the detected frequency information. Scholars have used the vibration method to establish the correlation between vibration and elastic modulus, bending strength, and hardness. Secondly, an ultrasonic based elastic modulus testing device mainly consists of an acoustic transmitter, an acoustic receiver, and an ultrasonic testing instrument. Ultrasonic waves generate sound pulses that enter the tested material, undergo penetration, reflection, attenuation, and are collected by sensors at the other end. By extracting different signal parameters and processing them, material properties are predicted. Different ultrasonic parameters (propagation time, propagation speed, energy peak, frequency) can be used to detect the elastic modulus, surface defects, structural material decay degree, etc. of the board. Thirdly, the elastic modulus detection equipment based on stress waves is mainly composed of small hammers, acceleration sensors, stress wave testers, computer software, etc. This device calculates the elastic modulus of the specimen by measuring the transmission speed of stress waves in the specimen and combining it with the density of the specimen.
- Vertical bending testing machine:
The vertical bending testing machine consists of two sets of loading frames, transmission mechanisms, hydraulic devices, torque and displacement sensors, and data acquisition systems. The loading frame is composed of an active column and a driven column, and the two sets of loading frames are used to apply loads to the corresponding edges at both ends of the plate. Before starting work, move the active column to the corresponding position according to the required testing spacing according to the standard, and ensure the distance and parallelism between the two columns. After the test begins, the loading frame bends the plate in an arc motion centered on its active column, providing equal and opposite bending moments at both ends, with a deformation measurement accuracy of 0.02mm. It is mainly used for the bending property test of large size structural plates or cut Flat noodles.
- Shear wall testing equipment:
The shear wall testing equipment mainly consists of a fixed frame, transmission mechanism, hydraulic device, torque and displacement sensors, and a data acquisition system. According to the stress characteristics of building walls, the main test is the ability of structural sawn timber and panel walls to resist horizontal wind and seismic loads. Shear wall testing equipment is mainly designed for walls with a height of 2.4m or above. By testing and analyzing different structural parameters, such as the connection method of wall panel installation, connector specifications and performance parameters, and connector center spacing, the bearing capacity and stiffness of shear walls and their influencing factors are studied.
Impact load testing equipment: The impact load testing equipment mainly consists of impact hammer, supporting crossbeam, edge extension support, transmission mechanism, hydraulic device, data acquisition system, controller, and other parts. The testing work is completed through a computer control system, fully realizing automated testing. After the board is placed on the supporting crossbeam and fixed, the computer controls the impact hammer to fall freely, recording the force and displacement information of the board at the time of collision.
- Fatigue strength testing equipment:
At present, the fatigue strength testing equipment in China is mainly used for container bottom plate testing, which is mainly composed of load cars, fixed frames, transmission mechanisms, control systems, etc. According to the requirements of the national standard physical and mechanical performance indicators, the rolling shear strength test is usually carried out on the wooden floor for containers, that is, the 7260kg load trolley test is carried out under the stamping of the reciprocating dynamic load under full load. Perform a spot check procedure to verify the maximum deformation and permanent deformation of the bottom plate under instantaneous fatigue strength impact. This not only enables comprehensive testing and analysis of various indicators such as static bending strength, elastic modulus, bonding strength, moisture content, density, etc. of the bottom plate, but also simulates the actual stress situation through large-scale tests on a 7260kg small car, which can truly reflect the overall performance and stability of the bottom plate.
- Mechanical performance testing machine for structural plywood:
The structural plywood mechanical testing machine developed by the Beijing Forestry Machinery Research Institute of the State Forestry Administration (hereinafter referred to as the Beijing Forestry Machinery Institute) integrates uniform load testing, concentrated load testing, and impact load testing. It has powerful functions, compact structure, simple operation, strong practicality, and universality. Concentrated load and impact load are used to simulate the actual stress situation of roof panels, wall panels, or floor panels. Plate specimens are placed flat on three equally spaced support components to form a double span continuous plate. According to the support situation of the edges at both ends of the plate, they are divided into three stress states. The load is applied to the most unfavorable position to detect the deflection and ultimate load of the plate.
According to the actual working conditions, the equipment can complete 1220mm × Testing of 1220mm large-sized panels with standard spans of 300mm, 400mm, 500mm, and 600mm; Integrating the testing work of three loading methods improves the efficiency and convenience of wood-based panel testing; The fixed block can meet the requirement of 45mm × 90mm、40mm × Fixation of 90mm and smaller wooden square section sizes for easy adjustment; The loading plate is connected to the connecting shaft through a joint ball bearing, and can swing within a certain angle range to achieve stable and uniform loading; The entire testing process is automated, and there are manual or automatic testing methods available for selection; The entire equipment adopts modular and standardized design, which can achieve high-precision and high stability testing.
- Mechanical stress grading testing machine for structural sawn timber:
The structural sawn timber mechanical stress grading testing machine developed by Beijing Forestry Machinery Institute passes the tested structural sawn timber through a detection channel, in which the structural sawn timber forms a constant elastic deformation without damage, and the corresponding applied load is measured. The measured data is then transmitted to the computer system through a force sensor to calculate the bending elastic modulus of the structural sawn timber, Compare this data with the set data grading group, grade the strength of the sawn timber of the tested structure, and output the grading results.
This equipment not only needs to consider factors such as wood species, geometric size, moisture content, density, ring width, and texture slope, but also comprehensively considers control parameters such as loading method, movement speed, force, displacement, as well as the impact of equipment vibration, environmental temperature and humidity. By establishing a corresponding relationship between the strength and flexural modulus of elasticity of structural wood, quality control and rapid grading of structural wood can be achieved.
- Wood structure truss tooth extraction tester:
The wood structure truss tooth extraction tester developed by Beijing Forestry Machinery Institute is mainly used to monitor the deformation of the tooth plate under cyclic load. The device consists of temperature and humidity sensors, high-precision LVDT displacement sensors, data acquisition modules, RS485/RS232 serial port conversion modules, and industrial control computers. This testing system can monitor the small deformation at the connection of the tooth plate, and monitor the tooth extraction of the tooth plate for a long time by installing three high-precision LVDT displacement sensors vertically at three different positions of the same connecting tooth plate. The data acquisition module has a 16 bit A/D conversion resolution, 8 differential inputs, provides RS-485 interface to connect to the upper computer, and is equipped with high overvoltage protection to avoid the impact of on-site and channel interference on data acquisition. The testing system can monitor the impact of temperature and humidity on the tooth extraction amount under cyclic load in real-time. The software uses a graphical development platform to process and visually analyze the collected data, predict the trend of tooth extraction amount change of the tooth plate, and study the impact of cyclic load on the connection performance of the tooth plate under actual working conditions.
- Torsion testing machine:
The torsion testing machine is composed of a loading system, a transmission system, an STC300 digital data acquisition and processing system, and a computer measurement and control display system. It is suitable for testing the static mechanical performance of metal materials, non-metallic materials, and various components such as transmission shafts and half shafts.
- Impact testing machine:
The impact testing machine is used to measure the resistance performance of metal materials to impact under dynamic load, in order to determine the quality status of materials under dynamic load.
- Friction and wear testing machine:
The friction and wear testing machine can be used to evaluate the friction and wear performance of engineering materials such as lubricants, metals, plastics, coatings, ceramics, and their surface modification treatments.
- Cup protrusion testing machine:
The cupping test machine is a precision equipment for conducting process performance tests on metal sheets and strips, verifying the plastic deformation performance of metal sheets and strips during the testing process.
- Ring stiffness testing machine:
The ring stiffness testing machine is suitable for testing the ring stiffness, ring flexibility, and flatness of various pipes. According to the special needs of users, three functional tests can be added to the universal testing machine, namely tension, compression, and bending. It is a multifunctional electronic universal testing machine.
