Grinding wheel burst test device DMS

The grinding wheel cover strength test device is suitable forGB3883.3/IEC60745-2-3/EN60745-2-3The Anquan of Handheld Electric Tools **Section: Special Requirements for Grinding Machines, Polishing Machines, and Disc Grinding Machines20The specialized testing equipment for the strength test of the angular polishing machine and the straight grinding machine cover specified in the chapter meets the technical specificationsGB 3883.3Related requirements.

1 Applicable standards and standard requirements

1.1Applicable standard

GB 3883.3/EC60745-2-3/EN60745-2-3 "Anquan for Handheld Electric Tools **Part: Special Requirements for Grinding Machines, Polishing Machines, and Disc Grinding Machines

1.2 Standard related clause requirements

The strength test requirements for grinding wheel covers in GB 3883.3 are detailed in section20Chapter.

第20Chapter Mechanical Strength

20.101 All manufacturer recommended shields should have sufficient mechanical strength to prevent wheel fragments from flying towards the operator in the event of a wheel burst.

By submitting3Recommend a sample of protective cover for testing20.101.1to20.101.4Test to verify. According to the manufacturer's opinion, the test is feasible3A protective cover can be used, but it can be less than3A grinding machine. After the experiment, the tool should meet the requirements20.101.5Compliance requirements.

20.101.1 The protective cover should be securely installed on the grinder according to the instructions. If the protective cover is adjustable, it should be located as close as possible to the centerline or symmetry line of the grinding wheel, covering the grinding wheel at a position that is turned 30 ° (± 10 °) against the direction of rotation of the grinding wheel, or reaching the maximum set position when the adjustment range is less than 30 ° (see Figure 1060 and Figure 1803).

According to the instructions, a thick grinding wheel recommended by the manufacturer with a diameter equal to the rated capacity of the grinding machine should be installed on the spindle.

The grinding wheel machine should run at rated voltage without load for at least 5 minutes. Measure and record the speed of the grinding wheel.

20.101.2 The grinding wheel specified in 20.101.1 should be cut into four equal slots. right27、28, and41Type grinding wheel, groove cutting is carried out radially from the outer edge towards the center(See figure107)Yes, that's right6, and11Type grinding wheel, cutting starts from the working surface facing the installation end(See figure108).

Each slot width shall not exceed2.5mmThe deepening of the groove should require the grinding wheel to operate at a speed equal to or greater than20.101.1The established speed or rated speed of the grinding machine90%(Take the bigger one)Under the centrifugal force generated, it disintegrates.Install the slotted grinding wheel onto the spindle according to the instructions.

Note: Table102The typical pre cutting length range for standard grinding wheel sizes is provided

table102 Typical pre cutting length range for standard grinding wheel diameter