Remote actuator for ball injector

• US 7,364,051 B2
• Filed: 02/24/2004
• Issued: 04/29/2008
• Est. Priority Date: 02/24/2004
• Status: Expired due to Fees

• Current Assignee: SPM Flow Control Inc. (Caterpillar Incorporated)
• Original Assignee: SPM Flow Control Inc. (Caterpillar Incorporated)
• Inventors: Underwood, F. Rand, Diaz, Juan M.
• Primary Examiner(s): Mackey; Patrick
• Assistant Examiner(s): BUTLER, MICHAEL E
• Application Number:
  US10/785,922
• Publication Number:
  US 20050184083A1
• Time in Patent Office: 1,526 Days
• Field of Search: 221/265
• US Class Current: 221/265
• CPC Class Codes: E21B 33/138 Plastering the borehole wall; Injecting into the formation

Abstract

An electrical motor rotatably drives a motor shaft, and a helical rib radially extends from the shaft. The helical rib supports a number of balls, and forms a channel to accommodate the balls. The balls are dropped from the helical rib when the balls reach the bottom of the helical rib. Several targets are affixed to the shaft. A sensor is located adjacent to and apart from the shaft, and is positioned in close proximity to the targets. The sensor senses each target as each target rotates past the sensor. The number of targets sensed per revolution of the shaft is equal to the number of balls dropped from the helical rib per revolution of the helical rib. A counter in data communication with the sensor displays the number of targets sensed, and thus displays the number or balls dropped from the helical rib.

Claims

1. An apparatus for counting a plurality of balls, comprising:

a shaft rotatably driven by an electrical motor;

a helical rib radially extending from the shaft and adapted to support the balls, wherein the balls are dropped from the helical rib when the balls reach the bottom of the helical rib;

a plurality of target mounts spaced circumferentially around the shaft;

a selected number of targets, each of the targets releasably affixed to one of the target mounts on the shaft;

a sensor adjacent to and apart from the shaft, and positioned in close proximity to the targets, wherein the sensor senses each target as each target rotates past the sensor, and wherein the number of targets sensed per revolution of the shaft is equal to the number of balls dropped from the helical rib per revolution of the helical rib; and

a counter in data communication with the sensor, wherein the counter counts the number of targets sensed.

2. The apparatus of claim 1, wherein the targets protrude from the shaft.

3. The apparatus of claim 1, wherein the targets comprise members of ferrous metal, and wherein the sensor is a magnetic field sensor.

4. The apparatus of claim 1, wherein the targets on the shaft radially extend from an axis of the shaft.

5. The apparatus of claim 1, wherein the targets comprise heads formed on threaded members, and the target mounts comprise threaded holes in the shaft.

6. The apparatus of claim 5, wherein the number of threaded holes in the shaft is greater than or equal to the number of targets secured to the shaft.

7. The apparatus of claim 1, further comprising:

a replaceable bottom plate having holes and stationarily positioned at the bottom of the helical rib to receive and drop the balls;

a plurality of rods spaced circumferentially around the helical rib parallel to the shaft for trapping the balls between adjacent ones of the rods and preventing the balls from rolling down the helical rib; and

wherein the number of targets selected to be secured to the target mounts equals the number of holes in the bottom plate.

8. The apparatus of claim 1, wherein the targets comprise heads formed on threaded members, and the target mounts comprise threaded holes in the shaft.

9. An apparatus for counting a plurality of balls, comprising:

a cylindrical housing;

a shaft located concentrically within the housing and rotatably driven by an electrical motor;

a helical rib radially extending from the shaft for rotation therewith;

a replaceable bottom plate in the housing at a lower end of the shaft, the bottom plate having a selected number of apertures therein and spaced circumferentially around the shaft, the shaft being rotatable relative to the bottom plate, for dropping balls through the apertures in the bottom plate as the shaft rotates;

a plurality of rods spaced around the rib within the housing, the rods being parallel to the shaft and stationarily mounted in the housing to prevent the balls from rolling down the rib;

a plurality of target mounts spaced circumferentially around the shaft;

a plurality of targets, each of the targets releasably affixed to one of the target mounts, the number of the targets equaling the number of apertures in the bottom plate; and

a sensor adjacent to and apart from the shaft, and positioned in close proximity to the targets, wherein the sensor senses each target as each target rotates past the sensor, and wherein the number of targets sensed per revolution of the shaft is equal to the number of balls dropped from the helical rib per revolution of the helical rib.

10. The apparatus of claim 9, wherein the targets protrude from the shaft.

11. An apparatus for counting a plurality of balls, comprising:

a shaft rotatably driven by an electrical motor;

a helical rib radially extending from the shaft and adapted to support the balls, wherein the balls are dropped from the helical rib when the balls reach the bottom of the helical rib;

a plurality of threaded holes formed in the shaft and spaced circumferentially apart from each other;

a plurality of threaded members, each having a head thereon that is formed of a ferrous metal, the threaded members being secured to the threaded holes in the shaft;

a magnetic sensor adjacent to and apart from the shaft, and positioned in close proximity to the heads of the threaded members, wherein the sensor senses each head as each head rotates past the sensor, and wherein the number of heads sensed per revolution of the shaft is equal to the number of balls dropped from the helical rib per revolution of the helical rib; and

a counter in data communication with the sensor, wherein the counter counts the number of heads sensed.