Primary contact propelling device of low-voltage switch cabinet

Abstract

The invention relates to a primary contact propelling device of a low-voltage switch cabinet. The primary contact propelling device comprises racks 7, a transverse square rod 4, a longitudinal square rod 6, straight-tooth gears 3, a longitudinal bevel gear 5 and a transverse bevel gear 8. The transverse square rod 4 and the longitudinal square rod 6 are fixed to a drawer body and can rotate in the axial direction. The longitudinal bevel gear 5 is fixed to one end of the longitudinal square rod 6. The transverse bevel gear 8 is fixed to the middle of the transverse square rod 4. The modulus of the longitudinal bevel gear 5 is the same as that of the transverse bevel gear 8. The straight-tooth gears 3 are fixedly distributed on the transverse square rod 4. The racks 7 are matched and meshed with the straight-tooth gears 3. The transverse square rod 4 and the longitudinal square rod 6 are perpendicularly arranged to form a 90-degree angle so that the longitudinal bevel gear 5 can be meshed with the transverse bevel gear 8. One end of the longitudinal square rod 6 is exposed out of one end face of a drawer in the installation process. The racks 7 are fixedly connected with a pin box of a moving contact.

Description

technical field [0001] The invention relates to a primary contact propelling device of a low-voltage switchgear in a complete set of low-voltage switchgear and control equipment, and belongs to the technical field of low-voltage electrical appliances. Background technique [0002] National standard GB7251.1-2005 "Low-voltage complete switchgear and control equipment" and JB9661-1999 "Low-voltage withdrawable complete switchgear" and other standards stipulate that the withdrawable low-voltage complete set must have three positions: connection, test and separation In the test position, the primary main circuit (including incoming and outgoing lines) of the functional unit is separated from the power supply, while the secondary auxiliary circuit is still connected, and it is required that the unit door cannot be opened at the test position, without reducing the enclosure protection level. In order to adapt to the new national standard, each manufacturer improves the design on t...

AI Technical Summary

Problems solved by technology

In order to adapt to the new national standard, each manufacturer improves the design on the basis of the original mechanism, for example, the known Chinese patent No. 03240748.3 is disclosed in the utility model patent specification entitled "Propulsion Mechanism for Low-Voltage Drawer Type Switchgear". Although the propulsion mechanism can meet the requirement of not opening the door at the test position, the connection or separation of the dynamic and static contacts needs to drive the entire drawer body to move. Since there are other electrical components installed in the drawer body of the low-voltage switchgear, the electrical components follow the drawer body. Move together, so on the one hand, the electrical components will inevitably vibrate during the moving process, on the other hand, the weight of the drawer will also make the operation of entering and exiting more laborious

Another example is the known Chinese patent No. 200410064770.9, which is titled "Movable Propelling Continuous Drawer Functional Unit". The design is too complex and bulky

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