A pulley used for setting out lines at the wellhead

Abstract

The invention discloses a pulley for wellhead pay-off, and relates to improvement proposed for a pay-off pulley. The pulley is ingenious in structure, convenient to use and stable to connect; and overall equipment is extremely convenient to pick and place when used. The pulley comprises an outer frame, an inner frame, six pulleys and at least three expanding components, wherein the inner frame is a regular hexagon, and is fixedly connected in the outer frame through a plurality of support bars; the pulley is in a hollow straight tube form; the six pulleys sleeve six edges of the inner frame; and the adjacent pulleys are fitted with one another. When the pulley is put in, a spring can be compressed to shrink through the overall outer frame; the expanding components are clamped into the top of the wellhead one by one; through the structural forms of the spring and various L-shaped support plates, the pulley can be stably clamped in the wellhead of a cable shaft; and when the pulley is taken out, an operator can firstly extrude one or more L-shaped support plates, and the overall pulley can conveniently turn up, so that the pulley can be conveniently taken out finally. The pulley has the characteristics of being good in stability, convenient to pick and place and wide in application range as a whole.

Description

technical field [0001] The invention relates to the field of supporting equipment of a power system, in particular to an improvement proposed for a pay-off tackle. Background technique [0002] At present, when laying cables in cable trenches, the cables need to pass into the trench from the cable shaft along the way; at this time, in order to prevent cable damage, the operator usually lays a rubber pad at the wellhead in advance; however, due to the use of rubber pads The cost life is short and therefore highly susceptible to failure. In this regard, the National Bureau announced on December 12, 2012 a Chinese utility model patent named "A cable wellhead pay-off pulley block" with the application number "201220222864.4". In this case, several pulleys replaced the existing Technology in the rubber, thus maintaining a long service life. [0003] However, since the ring foot fits in this case and even connects with the wellhead through an interference fit during actual opera...

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