Introduction of test method for box filter press and plate and frame filter press

With the extensive application filter press, a variety of filter press developed rapidly. Whether it is a car body filter press or a plate and frame filter press, there are certain experimental methods to verify the quality of the filter press. (The following methods are available from Chengdu Rongcheng Filter Press.)

Before saying the experimental method. Let me first talk about what objects are tested on the filter press. There are the following aspects: the sealing performance of the whole filter chamber, the strength of each pressure-bearing component, the sealing of the hydraulic device, and the quality of the welding. I personally think that it is the most important in the filtration device. This aspect mainly includes viewing the filter cake, filtering the overall sealing type, and the uniformity of the filter cake. This is the most important part of the filter press.

Now introduce the inspection method and specific indicators of a filter press that meets the national standards.

The first is the inspection of the sealing performance of the whole machine. In the rated pressing force pressure, check the gap between the sealing surfaces with a feeler gauge, take the maximum value, the sealing surface standard is not more than 1.5mm, and the liquid removed at this time is 1.25 times the water pressure brought into the liquid. Hold it for 5 minutes, so that it can be tested for its sealed type. When the hydraulic pressing device is applied with a rated pressure of 1.25 times, the pressure drop of the pressure gauge on the pressing device is observed within 20 minutes after the pressure is stopped, and the sealing of the zero and the exposed surface of the component of the pressing device is checked. Also require noise control below the GB/T10894 standard. Filter plate pulling mechanism: one pull open, continuous operation 30 times; one by one, continuous cycle operation 10 times. The filter press is manually opened, and the pressing device continuously performs 5 cycles. This will ensure the rationality of the filter plate pulling mechanism.

The second is the inspection of the weld. Since the pressure filter is operated, high pressure is generated in the device, so the requirements for the weld are also very high, and there is no sloppyness. The standard of the weld is generally carried out according to the provisions of GB/T2650. In addition to the inspection of carbon steel plates, if there is stainless steel, the corrosion test shall be carried out according to the provisions of GB/T4334.1~GB/T4334.5. For stainless steel, austenitic stainless steel is preferred.

Again, the thickness tolerance of the sealing surface of the filter plate, the filter frame and the feed plate is, of course, the smaller the better. The roughness of the filter plate, filter frame, compression plate, thrust plate and the sealing surface of the feeding plate, the roughness of the sealing plate, the filter frame, the pressing plate, the thrust plate and the sealing surface of the feeding plate are in accordance with GB/T6060.2 And GB/T10610 regulations. Filter plate, filter frame sealing and filter frame strength A filter unit to be inspected (the filter plate filter surface must have a through hole for easy simultaneous pressure test on both sides) on the test bench (not shown), to 1.25 Press the rated pressure of the multiple times, then input 1.25 times the rated pressure of the water pressure into the filter chamber, and check the sealing of the joints and the outlets at the pressure for 1 min. The shut-off valve 4 was closed and the pressure drop of the filtration pressure within 2 min was observed. Remove the filter unit and check the filter plate and filter frame damage one by one.