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Long-stroke pumping unit

  • US 10,196,883 B2
  • Filed: 01/11/2016
  • Issued: 02/05/2019
  • Est. Priority Date: 01/09/2015
  • Status: Active Grant
First Claim
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1. A long-stroke pumping unit, comprising:

  • a tower;

    a counterweight assembly movable along the tower;

    a drum connected to an upper end of the tower and rotatable relative thereto;

    a belt having a first end connected to the counterweight assembly, extending over the drum, and having a second end connectable to a rod string;

    a prime mover for reciprocating the counterweight assembly along the tower;

    a sensor for detecting acceleration of the counterweight assembly due to failure of the rod string;

    a crown mounted atop the tower;

    a shaft connected to the drum and rotatable relative to the crown;

    a braking system for halting movement of the counterweight assembly;

    the braking system includes;

    a disk disposed around and torsionally connected to the shaft;

    a caliper mounted to the crown;

    a piston disposed in a chamber formed in the caliper and movable relative to the caliper between an engaged position and a disengaged position;

    a brake shoe connected to the piston; and

    a brake pad mounted to the brake shoe, wherein the brake pad is clear of the disk in the disengaged position and pressed against the disk in the engaged position; and

    a controller in communication with the sensor and operable to activate the braking system in response to detection of the acceleration.

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