The tensile testing machine is also known as a universal material testing machine or tensile machine. It adopts an electromechanical integration design and consists of main part, mechanical part, hydraulic system, The force measuring system is mainly composed of a force measuring sensor, a transmitter, a microprocessor, a load driving mechanism, a computer and a color inkjet printer.
Using a tensile testing machine
mesh rope, textile, metal bar, tensile strength The testing machine can for tensile testing of waterproof materialsalien, rubber, wire and cable, plastic, metal wire, metal plate and other materials can be used. Adding accessories can be used for compression, bending and other tests. It has the following functions: digital display of the test force, infinitely adjustable test speed, automatic stop when specimen breaks and peak value storage.
Installation, Precautions and Maintenance of Tensile Testing Machine
Tensile Test The machine should be in a be installed in a clean, dry, vibration-free room with an ambient temperature of 20°C ± 10°C, and care should be taken to leave enough space around the testing machine for beam bend testing, extensometer testing, and equipment maintenance.Area.
1. Installation
The main body of the tensile test mmachine and the dynamometer should be installed on the concrete foundation. The size of the foundation should be based on the shape and foundation plan, leaving holes for the anchor bolts, mandible bolt rods and other wire plumbing tubes and other fixtures. The upper level of the foundation should be flat and leveled with a leveling rod. After the foundation is dry, install the testing machine.
Tensile testing machine installation and preliminary accuracy correction
Move the main body or dynamometer to the concrete foundation, adjust them Distance between the main body and the dynamometer and adjust the direction according to the shape and the foundation map, and then insert a thin piece of iron into the bottom of the main body and the dynamometer (between the foundation) and use 0.05/1000 The Zur separate AA precise square spirit level is used for alignment. The preliminary alignment of the main body can be measured with a spirit level at two vertical and horizontal positions of the two columns, and the verticality should not be greater than 0.3/1000.
2. Correction of the accuracy of the tensile testing machine
After the above testing machine After the preliminary accuracy of the test machine has been corrected, the oil pipe, power supply and oil filling are connected to carry out a preliminary test run. If the test run is in good condition, the accuracy of the test machine will be corrected. Use a square horizontal instrument to lean on the work platform to find out the plumb accuracy of the oil cylinder, adjust the iron under the machine base, or increase or decrease, so that the error is not greater than 0.10/1000 is After the accuracy of the testing machine has been determined, fill any gaps under the machine base with cement slurry to keep the machine base and cement foundation well bonded and to prevent the testing machine from becoming unlevel due to vibration during use. After the anchor nuts have been poured, it is not allowed to tighten the anchor nuts and start the testing machine until the cement is dry. (The cement drying time is generally not less than 10-15 days) After the cement is completely dry, fasten the wheel nuts and check the installation accuracy of the testing machine again to see if it matches the alignment accuracy. If it doesn't match, it should be corrected again. During the use of the tensile testing machine, the vibration during the test tends to loosen, so after a period of time, the relevant parts should be the Verbe tightened using the tensile testing machine.
3. Apply
Install the oil pipe connecting the main body and of the dynamometer, the inside of the oil pipe should be washed with petroleum first to ensure the cleanliness of the oil circuit. Care should be taken to ensure that the seal is complete at the joint to prevent high pressure oil leakage.
4. Selection of oil specifications
For hydraulic rotation, you can use N68- Hydraulic oil for precision machine tools can also be used with other oils with similar specifications. The kinematic viscosity is (100 °C) 11-14 centistokes.
5. Fill in oil and drain oil
Open the air filter on the fuel tank, oil in fill the fuel tank, Once the amount of oil injected is about 24 kg. For the specifications of the oil used, see the specification introduction of the oil. To drain the oil, simply open the oil nipple on the left bottom side of the dynamometer. The life of the oil depends on the climate of the respective place. Replace with new oil when it is worn out or dirty and can no longer be used.
6. Connect to the mains supply
The electrical equipment of the tensile testing machine is inside the dynamometer, and the power supply is a three-phase four-wire system body and the dynamometer is connected by a plug. Before turning on, the dust and other impurities in the control box should be cleaned. After the power line is inserted, press the power button on the dynamometer panel and the indicator light will turn onto prove that the power supply has started. At this time, press the oil pump start button to observe the direction of rotation of the motor, and then press the jaw seat raising button to check the lower jaw mouth seat matches the text displayed on the button and check the limit switches work.
7. Lubrication
Lubricating oil can be poured on the lower jaw screw rod be used to lubricate the screw rod and screw nut. There is an oil injection hole on the machine base, which is used to inject oil do not exceed the lower flat part of the dipstick. The bottom of the The oil dipstick is the oil in the oil pan The minimum oil level.
8. Commissioning and test run of the oil pump
Press the Button on the dynamometer table to start or stop the oil pump. When you run for the first time after installation or change the cable connector, you should check whether the oil circuit of the oil pump is released.
9. Safety device
The main oil cylinder and the hydraulic chuck part of the tensile testing machine are equipped with a protective overflow valve and a limit switch。
10. Things to pay attention to during operation
If you are testingDuring the operation, the oil pump suddenly stops working. At this point, the extra load should be removed to reduce oil pressure. After the inspection, theOil pump to be restarted for testing. The oil pump should not be started under high pressure or the cause of the accident should be checked.
2 If the electrical equipment breaks down while the tensile testing machine is working, and the start or stop button does not work, the power supply should be cut off immediately to stop the tensile testing machine Machine.
Third, non-operating personnel are prohibited from operating the aircraft.
11. Tensile testing machine maintenance
All parts of tensile testing Wipe it clean . After cleaning, apply cotton gauze with some motor oil and wipe again to prevent rust. Wipe it more gently during the rainy season. Cover it with a dust cover when not in use to prevent dust ingress. After each test wThe test stand is lowered so that the piston does not fall on the bottom of the oil cylinder and there is a little clearance for the next use. All valves on the dynamometer should not be opened to prevent dust from getting inside and impairing the sensitive function of the measuring mechanism. The oil pump motor should be switched off when the test is interrupted.
