Hydraulic universal testing machine test force sensor

Hydraulic universal testing machineThe rotation of the test force sensor pointer is instable, which means that the pointer of the test force sensor trembles or jumps when loading the hydraulic universal testing machine.
The reason for this failure may be that the air in the oil pump of the hydraulic universal testing machine is not completely removed, or the piston and bearing are contaminated with oil. The methods to troubleshoot such failures are:
, completely eliminate the air in the hydraulic universal test oil pump.
Second, thoroughly clean the cylinder or piston that performs polishing and replaces the test force sensor.
Third, thoroughly clean the bearings with gasoline, drip the appropriate dose of instrument oil (avoid dripping onto the reading disk), lubricate the bearings; replace the rusted bearings. The hydraulic universal testing machine after trimming must be calibrated with a third-class standard test force sensor. Error caused by test force sensor part of hydraulic universal testing machine
When the test force sensor part is not installed horizontally, friction will occur between the swing shaft bearings, which will generally become a negative difference.
Error solution
1. First check whether the hydraulic universal testing machine is installed horizontally, and level the frame-type horizontal ruler in two directions where the outer rings of the working cylinder (or column) are perpendicular to each other.
2. Adjust the front and back levels of the test force sensor on the front and back of the test force sensor on the front and back of the swing rod, align the edge of the swing rod with the inner engraving line, and use a horizontal ruler to adjust the left and right levels of the body with a horizontal ruler.
Selection of hydraulic universal testing machine fixture
1. Select the main fixture according to the main machine test force. The force that the hydraulic universal testing machine fixture can withstand must be greater than or equal to the test force of the main machine.
2. Select some secondary fixtures based on non-standard configuration or extended configuration. (For example: the extended configuration sensor is 10kN, and the test force that the selected secondary fixture can withstand must also be 10kN.
3. Choose fixtures based on customer samples. (For example: the customer provides the shape, test force, etc. of the sample.
4. What kind of fixture is recommended for customers to use. (For example: rope samples with a diameter less than 1mm, including steel wire, iron wire, thin wire, etc. You should clearly tell the customer that this kind of sample can only be used for winding clamping, but the elongation error of the sample is large). The test results of hydraulic universal testing machines sometimes have errors. The occurrence of this error has a relatively small impact on large load measurements, but it has a great impact on small load measurements. How to solve the error of the test results of hydraulic universal testing machines?
Error analysis: There may be two reasons. One is the main unit part, and the other is the test force sensor part.
Error caused by the host part
When the main unit is not installed horizontally, friction will be caused to cause errors to occur between the working piston and the working cylinder wall. It generally manifests as positive differences, and as the load increases, the errors generated gradually become smaller. Solutions to instability of the rotation of the force sensor pointer in hydraulic universal testing machine

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