Hydraulic side load braking system

Patent metadata

Field	Value
Publication number	US-9327946-B2
Application number	US-201213549870-A
Country	US
Kind code	B2
Filing date	Jul 16, 2012
Priority date	Jul 16, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A boom system includes a boom turret, a brake for preventing rotational movement of the boom turret, and a controller for actuating the brake. The brake prevents movement of the turret when the turret is subject to rotational loading below a torque threshold and allows rotational movement of the turret when the turret is subject to rotational loading above the torque threshold. The controller dynamically adjusts the torque threshold in response to changes in the position of the boom during operation of the boom system, including applying a lower torque threshold when the boom is in a first position and applying a higher torque threshold when the boom is in a second position.

First claim

Having thus described various embodiments of the invention, what is claimed as new and desired to be protected by Letters Patent includes the following:

1. A boom system for supporting a load comprising:
a boom configured to pivot upward and downward in a pivoting plane,
said boom configured to su ort the load in either an aligned orientation or a non-aligned orientation,
wherein the aligned orientation is defined as the load being directly below the boom in the pivoting plane,
wherein the non-aligned orientation is defined as the load being outside the pivoting plane, such that the load imparts a torque on the boom;
a boom turret configured to selectively rotate the boom safely while the torque imparted on the boom is below a torque safety threshold;
a brake for preventing rotational movement of the boom turret,
wherein when the torque imparted on the boom is turret is below the torque safety threshold, the brake prevents rotational movement of the boom turret,
wherein when the torque imparted on the boom is above the torque safety threshold, the brake allows rotational movement of the boom turret; and
a controller for automatically actuating the brake to dynamically adjust the torque safety threshold in response to changes in the position of the boom during operation of the boom system,
wherein the controller applies a lower torque safety threshold when the boom is in a first position,
wherein the controller applies a higher torque safety threshold when the boom is in a second position,
wherein the brake is configured to allow rotational movement when the torque is above the torque safety threshold such that damage to the boom system is prevented.

2. The boom system of claim 1 , the first position resulting in a smaller total-weight radius and the second position resulting in a larger total-weight radius,
wherein the total-weight radius is a distance measurement being the summation of a boom-weight radius and a load-weight radius,
wherein the boom-weight radius is the horizontal distance from a central, vertical rotational axis of the turret to the center of gravity of the boom,
wherein the load-weight radius is the horizontal distance from said central, vertical rotational axis of the turret to a center of gravity of the load.

3. The boom system of claim 1 , further comprising a motor for inducing rotational movement in the boom turret,
wherein the controller disengages the motor from the boom turret when applying the brake,
wherein the controller disengages the brake from the turret when activating the motor to rotate the boom turret.

4. The boom system of claim 1 , further comprising a first sensor for sensing a length of the boom and a second sensor for sensing an angle of the boom, the first sensor and the second sensor in communication with the controller for communicating boom length and angle information to the controller.

5. The boom system of claim 1 , wherein the controller actuates the brake such that the torque safety threshold increases and decreases according to a continuous, smooth pattern.

6. The boom system of claim 1 , wherein the controller actuates the brake such that the torque safety threshold increases and decreases according to a stepped pattern comprising a plurality of discreet torque safety threshold values.

7. A boom system comprising:
a boom configured to pivot upwards and downwards in a pivoting plane and to support a load;
a boom turret configured to rotate the boom;
a hydraulically actuated brake configured to prevent rotational movement of the boom turret when the boom is subject to a loading outside the pivoting plane so as to impart a torque on the boom turret below a torque safety threshold and to allow rotational movement of the boom turret when said torque exceeds the torque safety threshold so as to prevent damage to the boom system;
a hydraulic valve in hydraulic communication with the brake, the hydraulic valve for selectively applying hydraulic pressure to the brake in response to receiving control signals,
wherein the hydraulic pressure applied by the hydraulic valve is associated with and proportional to the torque safety threshold; and
a controller for dynamically communicating the control signals to the valve according to a position of the boom during operation of the boom system,
wherein the control signals result in less hydraulic pressure to the brake when the boom is in a position resulting in a smaller total-weight radius,
wherein the control signals result in greater hydraulic pressure to the brake when the boom is in a position resulting in a larger total-weight radius,
wherein the total-weight radius is a distance measurement being the summation of a boom-weight radius and a load-weight radius,
wherein the boom-weight radius is the horizontal distance from a central, vertical rotational axis of the turret to the center of gravity of the boom,
wherein the load-weight radius is the horizontal distance from said central, vertical rotational axis of the turret to a center of gravity of the load.

8. The boom system of claim 7 , further comprising a hydraulic motor for inducing rotational movement in the boom turret, wherein the controller disengages the motor from the turret when applying the brake.

9. The boom system of claim 8 , the controller being configure to disengage the brake from the turret when activating the motor to rotate the turret.

10. A boom system for supporting a load, the boom system comprising:
a boom turret configured to rotate a boom;
a hydraulically actuated brake configured to selectively prevent rotational movement of the boom turret;
a hydraulic valve in hydraulic communication with the brake, the valve for selectively applying hydraulic pressure to the brake in response to control signals;
a plurality of sensors for detecting a position of the boom associated with the boom turret during operation of the boom system; and
a controller for ensuring that the brake prevents unsafe operation of the boom assembly,
said controller receiving information indicative of the position of the boom during operation of the boom system,
said controller determining a torque safety threshold based upon a total weight radius of the boom assembly,
wherein the torque safety threshold is a calculation of the maximum torque under which the boom turret can safely rotate,
wherein the torque is imparted on the boom turret from the load being disposed outside a pivoting plane of the boom,
said controller dynamically communicating the control signals to the valve based upon the torque safety threshold.

11. The boom system of claim 10 ,
wherein the control signal results in less hydraulic pressure to the brake when the boom is in a position resulting in a smaller total-weight radius,
wherein the control signal results in greater hydraulic pressure to the brake when the boom is in a position resulting in a larger total-weight radius.

12. The boom system of claim 11 ,
wherein the total-weight radius is a distance measurement being the summation of a boom-weight radius and a load-weight radius,
wherein the boom-weight radius is a horizontal distance from a central, vertical rotational axis of the turret to the center of gravity of the boom,
wherein the load-weight radius is a horizontal distance from said central, vertical rotational axis of the turret to a center of gravity of the load.

13. The boom system of claim 10 , further comprising a motor for inducing rotational movement in the boom turret,
wherein the controller disengages the motor from the boom turret when applying the brake,
wherein the controller disengages the brake from the boom turret

Assignees

• Stakor Gregory M
• Dodge Iv William Baldwin
• Altec Ind Inc

Inventors

• Stakor Gregory M
• Dodge Iv William Baldwin

Classifications

• B66C23/84

  Slewing gear (anti-friction bearings F16C) · CPC title

• B66C13/18 Primary

  Control systems or devices (exclusively for rope, cable, or chain winding mechanisms B66D1/40) · CPC title