Precautions and maintenance for the installation a

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Installation, use precautions and maintenance of the tensile testing machine

the tensile testing machine should be installed in a clean, dry, vibration free room with a room temperature of 20 ℃± 10 ℃, And noted that "The recycled materials from clear sources and reasonable recycling shall be processed into plastic express bag beam bending test, test with extensometer and equipment maintenance. Sufficient spare area shall be reserved around the testing machine.

1. The main body and dynamometer of the installation

tensile testing machine shall be installed on the concrete foundation, and the foundation size shall be set aside according to the outline and foundation drawing, with holes for foundation screws and lower jaw screw rods and other wires Install pipes and other devices

the upper plane of the foundation should be flat, align with a level ruler, and install the testing machine after the foundation is dry

① installation of tensile testing machine and preliminary accuracy alignment

transport the main body and dynamometer to the concrete foundation respectively, adjust the distance between the main body and the dynamometer according to the shape and foundation drawing, and adjust the direction that the thermohex core material is about 80% lighter than the solid thermoplastic core material currently used, and then use thin small iron blocks to insert into the bottom of the main body and dynamometer respectively (between the foundation), Use a square level with an accuracy of 0.05/1000 to align them respectively

preliminary alignment of the main body

the vertical and horizontal positions of the two columns can be measured with a square level, and the non verticality shall not be greater than 0.3/1000. Then, the square level can be used to lean against the vertical and horizontal positions of the outer surface of the oil cylinder to align its verticality

② accuracy alignment of tensile testing machine

after the above preliminary accuracy alignment of the testing machine, connect the oil pipe, power supply and oil filling, and carry out the preliminary operation test run. After the test run is in good condition, then carry out the accuracy alignment of the testing machine

lean on the working platform with a square horizontal instrument, align the verticality of the oil cylinder, adjust or increase or decrease the sizing block under its base, so that the error shall not be greater than 0.10/1000

after the accuracy of the testing machine is found, use cement slurry to fill all the gaps under the machine base, keep the machine base well combined with the cement foundation, and prevent the uneven level of the testing machine caused by vibration during use

after the foundation nut is poured, it is not allowed to tighten the foundation nut and start the testing machine before the cement is dry. (the cement drying time is generally not less than days) after the cement is completely dried, tighten the foot nut, and recheck the installation accuracy of the testing machine to see whether it is consistent with the alignment accuracy. If it does not meet the requirements, it should be re aligned

during the use of the tensile testing machine, due to the vibration during the test, it is easy to loose, so the relevant parts should be fastened after the tensile testing machine is used for a period of time

2. When installing the oil pipe connecting the main body and the dynamometer, clean the inside of the oil pipe with kerosene to ensure the cleanness of the oil circuit. Pay attention to whether the gasket at the joint is complete to prevent oil leakage under high pressure

3. The specification of oil is

in hydraulic rotation, N68 precision machine tool hydraulic oil can be used, and other similar specifications of oil can be used, with kinematic viscosity of (100 ℃) centigrade

4. Fill and drain oil

open the air filter on the oil tank, fill the oil into the oil tank, and the amount of oil injected at one time is about 24 kg. See the specification of oil for the specification of oil. When draining the oil, open the oil nozzle at the bottom of the left side of the dynamometer. The service life of the oil depends on the local climate. If the oil begins to deteriorate or is dirty and cannot be used, replace it with a new oil

5. Power on

pull test in the view of Ma Zhanfeng, Secretary General of China Plastics Processing Industry Association, the electrical device of the machine is in the dynamometer, and the power supply is three-phase four wire system. The circuit between the main body and the dynamometer is connected by plug. Before power on, the dust and other impurities in the electrical box should be cleaned. After the power line is introduced, press the "power" button on the dynamometer panel, and the indicator light is on to prove that power supply has begun, At this time, press the oil pump start button, observe the rotation direction of the motor, and then press the jaw base lifting button to check whether the lifting action of the lower jaw base is consistent with the text shown on the button, and check whether each limit switch works

6. Lubrication

you can pour lubricating oil on the screw rod of the lower jaw to lubricate the screw rod and the screw nut. There is an oil injection hole on the base, which injects oil into the oil to lubricate the worm. The scale of the oil in the oil can be measured by the oil probe, and the maximum oil level of the oil does not exceed the lower flat part of the oil probe. The lower end of the oil probe is the lowest oil level in the oil pan

7. Initial operation and commissioning of oil pump

press the button on the dynamometer table to start or stop the rotation of oil pump. When running for the first time after installation or changing the wire connector, check whether the oil circuit of the oil pump is unblocked

8. Safety device

the main oil cylinder and hydraulic chuck Department of the tensile testing machine are equipped with protective overflow valve and limit switch

9. Precautions during operation

① if the oil pump suddenly stops working during the test, the added load should be removed at this time to reduce the oil pressure. After inspection, restart the oil pump for test. Do not start the oil pump under high pressure or check the cause of the accident

② if the electric appliance fails and the start or stop button does not work when the tensile testing machine is working, the power supply should be cut off immediately to stop the testing machine

③ it is forbidden for non operators to operate the machine

10. Maintenance of tensile testing machine

all parts of the tensile testing machine should be wiped clean frequently. After wiping the parts that are not painted, wipe them again with cotton yarn dipped with a small amount of engine oil to prevent rust. During the rainy season, pay more attention to wiping, and cover them with a dust cover when not in use to prevent dust intrusion

after each test, the test bench descends. It is best not to drop the piston on the bottom of the oil cylinder, leaving a little distance for the next time to use the impact testing machine. How to operate it. All valves on the dynamometer should not be opened to prevent dust from entering the interior and affecting the sensitivity of the measuring mechanism

turn off the oil pump motor when the test is suspended. (end)

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