Auto-lock hydraulic hoist cylinder device and control method thereof

Patent metadata

Field	Value
Publication number	US-12012977-B2
Application number	US-202017297916-A
Country	US
Kind code	B2
Filing date	Nov 12, 2020
Priority date	Jun 30, 2020
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

The invention provides an auto-lock hydraulic hoist cylinder device, comprising: a lock actuator, a lock transmission mechanism and a load-bearing mechanism, wherein the load-bearing mechanism includes load-bearing locking shaft, a load-bearing nut is provided on the load-bearing locking shaft, installed on the upper side of the upper end cover of the main hydraulic hoist, a number of protrusions is provided on the lower end of the load-bearing locking shaft, a locking cover is provided with a through hole for the load-bearing locking shaft to pass through, a groove for matching the protrusions is provided on the side wall of the through hole, a piston rod is fixed on the lower end of the locking cover, the lock actuator is provided on the upper end cover, the lock actuator drives the load-bearing locking shaft through the lock transmission mechanism.

First claim

What is claimed is:

1. An auto-lock hydraulic hoist cylinder device, comprising: a lock actuator ( 1 ), a lock transmission mechanism ( 2 ) and a load-bearing mechanism ( 3 ), wherein said load-bearing mechanism includes a load-bearing locking shaft ( 301 ), a load-bearing nut ( 302 ) is provided on said load-bearing locking shaft ( 301 ), installed on the upper side of an upper end cover ( 502 ) of a main hydraulic hoist ( 5 ), a number of protrusions ( 303 ) are provided on the lower end of said load-bearing locking shaft ( 301 ), a locking cover ( 304 ) is provided with a through hole for said load-bearing locking shaft ( 301 ) to pass through, a groove ( 305 ) for matching said protrusions ( 303 ) is provided on the side wall of the through hole, a piston rod ( 506 ) is fixed with the lower end of said locking cover ( 304 ), said lock actuator ( 1 ) is provided on said upper end cover ( 502 ), and drives said load-bearing locking shaft ( 301 ) via said lock transmission mechanism ( 2 ).

2. The auto-lock hydraulic hoist cylinder device according to claim 1 , wherein said lock actuator_( 1 ) includes a two-way cylinder-operated hydraulic cylinder ( 101 ), a unit piston rod ( 102 ) at both ends of said two-way cylinder-operated hydraulic cylinder ( 101 ) is installed on said upper end cover ( 502 ) through a support ( 103 ), said lock transmission mechanism ( 2 ) includes a rack ( 201 ) arranged on the outer wall of a movable hydraulic cylinder ( 104 ) of said two-way cylinder-operated hydraulic cylinder ( 101 ), said rack ( 201 ) meshes with a gear ( 202 ) encircling the upper end of said load-bearing locking shaft ( 301 ).

3. The auto-lock hydraulic hoist cylinder device according to claim 2 , wherein the length L of said rack ( 201 ) is πr/n, n is the number of said protrusions ( 303 ), and r is the pitch radius of said gear ( 202 ).

4. The auto-lock hydraulic hoist cylinder device according to claim 1 , wherein said load-bearing nut ( 302 ) is fixed by a locking nut.

5. The auto-lock hydraulic hoist cylinder device according to claim 1 , wherein said device further includes a positioning system having an unlocking position sensor ( 4 ), a main hydraulic hoist ( 5 ), a locking position sensor ( 6 ), and a sensor contact head ( 7 ), said unlocking position sensor ( 4 ) and said locking position sensor ( 6 ) are provided on said upper end cover ( 502 ), said sensor contact head ( 7 ) is provided on said load-bearing nut ( 302 ).

6. The auto-lock hydraulic hoist cylinder device according to claim 5 , wherein an electromagnetic bolt ( 8 ) with position feedback is provided on said upper end cover ( 502 ), said electromagnetic bolt ( 8 ) is installed on said upper end cover ( 502 ) through an electromagnetic bolt support, a bolt hole ( 306 ) matching with the bolt head of said electromagnetic bolt ( 8 ) is provided on said load-bearing nut ( 302 ).

7. A control method for the auto-lock hydraulic hoist cylinder device according to claim 6 , comprising:
steps for operating the device from a locked status to an unlocked status includes:
S1: injecting hydraulic oil into a rod cavity side of said main hydraulic hoist ( 5 ), said hydraulic oil acting on the lower end of a piston ( 505 ) to drive said piston rod ( 506 ) to move upwards, and to drive said locking cover ( 304 ) to move upwards, said protrusions ( 303 ) passing along said groove ( 305 ), said groove ( 305 ) moving to the top of said protrusions ( 303 ), said piston ( 505 ) contacting the lower end surface of a limit block ( 503 ) fixed on said upper end cover ( 502 ) and then stopping its movement,
S2: said lock actuator ( 1 ) driving said load-bearing locking shaft ( 301 ) to rotate via the lock transmission mechanism ( 2 ) to misalign said protrusions ( 303 ) and said groove ( 305 ),
S3: decompressing the rod cavity side of said main hydraulic hoist ( 5 ), said piston rod ( 506 ) moving downwards, said protrusions ( 303 ) contacting said locking cover ( 304 ), a load of the cylinder device being transferred to said upper end cover ( 502 ) through said load-bearing locking shaft ( 301 ) and said load-bearing nut ( 302 ) to complete locking,
steps for operating the device from a locked status to an unlocked status includes:
B1: injecting hydraulic oil into the rod cavity side of said main hydraulic hoist ( 5 ), said hydraulic oil acting on the lower end of said piston ( 505 ) to drive said piston rod ( 506 ) to move upwards, and to drive said locking cover ( 304 ) to move upwards, the upper end surface of said piston ( 505 ) contacting the lower end surface of said limit block ( 503 ) fixed on said upper end cover ( 502 ) and then stopping its movement, said protrusions ( 303 ) being separated from said locking cover ( 304 ), and the load being borne by the hydraulic oil,
B2: said lock actuator ( 1 ) driving said load-bearing locking shaft ( 301 ) to rotate via the lock transmission mechanism ( 2 ) to align said protrusions ( 303 ) and said groove ( 305 ),
B3: injecting hydraulic oil into a rodless cavity side of said main hydraulic hoist ( 5 ), said hydraulic oil acting on the upper end of said piston ( 505 ) to drive said piston rod ( 506 ) to move downwards, discharging the hydraulic oil in the rod cavity side of said main hydraulic hoist ( 5 ), said locking cover ( 304 ) moving downwards to unlock, after unlocking, the hydraulic oil continues acting on said piston ( 505 ) in said main hydraulic hoist ( 5 ) to drive said piston rod ( 506 ) to performa required operation.

8. The control method of an auto-lock hydraulic hoist cylinder device according to claim 7 , wherein in S2, before said load-bearing locking shaft ( 301 ) rotates, said electromagnetic bolt ( 8 ) with position feedback is energized, and the bolt head of said electromagnetic bolt ( 8 ) retracts to unlock said load-bearing mechanism ( 3 ), in S3, said bolt head of said electromagnetic bolt ( 8 ) is inserted into said bolt hole ( 306 ) to lock sad load-bearing mechanism ( 3 ); in B2, before said load-bearing locking shaft ( 301 ) rotates, said electromagnetic bolt ( 8 ) with position feedback is energized, and the bolt head of said electromagnetic bolt ( 8 ) retracts to unlock said load-bearing mechanism ( 3 ), in B3, said bolt head of said electromagnetic bolt ( 8 ) is inserted into said bolt hole ( 306 ) to lock said load-bearing mechanism ( 3 ).

9. The auto-lock hydraulic hoist cylinder device according to claim 5 , wherein the included angle β between said unlocking position sensor ( 4 ) and said locking position sensor ( 6 ) is 180°/n, and n is the number of said protrusions ( 303 ).

Assignees

• China Three Gorges Corp

Inventors

• Dong Yantong
• Yang Shaojie

Classifications

• F15B2015/268

  Fluid supply for locking or release independent of actuator pressurisation · CPC title

• F15B15/2815

  Position sensing, i.e. means for continuous measurement of position, e.g. LVDT · CPC title

• F15B15/1428

  Cylinders (F15B15/1438 takes precedence) · CPC title

• F15B15/2807

  Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches · CPC title

• F15B15/261 Primary

  using positive interengagement, e.g. balls and grooves, for locking in the end positions · CPC title