A test device for a special filter for rail transit

Abstract

The invention discloses a test device for a special filter for rail transit, relates to the technical field of electronic circuit components, and includes a frame, a limiting platform, an edge grinding mechanism and a fine grinding mechanism. In the present invention, by installing the edge grinding mechanism and the fine grinding mechanism in the frame, the irreversible sag and crack damage to the ceramic medium during the grinding debugging process are avoided, and the scrap rate of the product debugging process is greatly reduced; The grinding head controlled by the solenoid valve is set to finely grind and debug the inner wall of the resonance hole, which realizes the instantaneous stop grinding after the debugging is qualified, and avoids the excessive grinding phenomenon caused by the continuous rotation of the tool itself due to inertia. The debugging accuracy is ensured; by setting the dust cleaning component inside the device, a downward high-level airflow beam is generated in the resonance hole to clean and blow out the ceramic waste that may be stuck, so as to ensure that the attached dust in the resonance hole can be removed. Avoid influencing the parameters of the test.

Description

technical field [0001] The invention relates to the technical field of electronic circuit components, in particular to a test device for a special filter for rail transit. Background technique [0002] The current rail transit signal system needs to lay a large-scale 5G network, which will bring new changes to the filter industry. Due to the high dielectric constant of the 5G ceramic dielectric filter, the electromagnetic wave can shorten the wavelength inside it, thereby realizing the filter. Miniaturization, combined with its unique advantages of low insertion loss and light weight, has great market potential in the field of rail transit. During the processing of ceramic dielectric filters, after the sintering process, due to the uneven temperature in the sintering furnace, it will There are defects on the surface of the workpiece, so it is necessary to grind the workpiece and adjust the resonant frequency of the filter. [0003] The existing technology is often realized ...

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Problems solved by technology

[0003] The existing technology is often realized by machine tool grinding, but our company has found that there are still certain disadvantages in the existing technology during the long-term filter processing process: 1. The dielectric filter is a high-precision product. Due to the characteristics of brittleness and high hardness, when the resonant hole is ground by a machine tool, the edge of the hole will often collapse due to the vibration of the grinding head. The size of the collapse is uncertain, and the irreversibility of ceramic grinding itself leads to Once the sag occurs, the test of a series of parameters such as the passband bandwidth and insertion loss of the filter is unqualified. At the same time, when the inner wall of the resonant hole is ground and debugged, the ceramic medium often resonates with the grinding tool. , and accompanied by mild microcracks, the debugging workpieces with the above conditions can only be treated as waste materials, the waste of materials is serious and the yield rate is not high; 2. After the grinding and debugging are qualified and the power source is turned off, the grinding tool is still under the action of its own inertia. It will continue to rotate a few times before stopping, so that the inner wall of the resonance hole will continue to be ground to a certain extent, which will lead to uncontrollable changes in the debugging parameters and affect the debugging accuracy; 3. During the grinding and debugging process, A large amount of ceramic powder dust will be generated in the resonance hole, and most of it will be discharged along the lower port. The existing technology adopts the method of directly sucking up the dust suction equipment to optimize the grinding and debugging environment, but there is often a large amount of dust in the resonance hole. Large strips of ceramic waste stuck in the resonant hole will still affect the debugging parameters

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