# US 2020/0400166 A1 · Load-adjusting quick oil cylinder and hydraulic lifting device

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- Number: US 2020/0400166 A1
- Document ID: US20200400166A1
- Status: Published application
- Kind: A1
- Application number: 16/805,705
- Filed: 2020-02-29
- Published: 2020-12-24
- Earliest claimed: 2019-06-21
- Assignees: Forcome (Shanghai) Co., Ltd.
- Applicants: Forcome (Shanghai) Co., Ltd.
- Inventors: Weihua CHEN
- Web page: https://patentgrep.com/patent/US20200400166A1

## CPC

- F15B 15/1428: {Cylinders (F15B15/1438 takes precedence)}
- F15B 15/18: Combined units comprising both motor and pump
- B66F 7/0625: {with wheels for moving around the floor}
- B66F 7/065: {Scissor linkages, i.e. X-configuration}
- B66F 7/08: hydraulically or pneumatically operated
- F15B 21/005: {Filling or draining of fluid systems}
- F15B 11/022: {in which a rapid approach stroke is followed by a slower, high-force working stroke (F15B11/0325 takes precedence)}
- F15B 11/036: by means of servomotors having a plurality of working chambers
- F15B 15/1466: {Hollow piston sliding over a stationary rod inside the cylinder}
- F15B 15/204: {Control means for piston speed or actuating force without external control, e.g. control valve inside the piston (F15B11/02, F15B15/22 take precedence)}
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- B66F: HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD ({invalid lifting devices A61G7/10; } mounting artificial islands on piles or like supports E02B17/00; scaffolding combined with lifting devices E04G1/22; lifting devices for sliding forms E04G11/24; lifting of buildings E04G23/06; shores or struts E04G25/00; lifts or other hoisting devices on ladders E06C7/12; props for mining E21D15/00)

## Abstract

A load-adjusting quick cylinder includes: a cylinder base (6); a pump cylinder (9) disposed on a reverse side of the cylinder base (6); a pump core (8) disposed in the pump cylinder (9); and sequentially disposed from inside to outside, an outer piston rod (1), an outer piston rod cylinder (4) and outer casing (3). The outer piston rod (1) includes an inner piston oil chamber (11) that holds a hollow inner piston rod (5); a main oil chamber (13) is provided between the outer casing (3) and the outer piston rod cylinder (4); an outer piston rod oil chamber (12) is provided between the outer piston rod cylinder (4) and the outer piston rod (1); and the inner piston oil chamber (11) and a pump cylinder oil chamber (10) are connected through a circulating oil passage in the cylinder base (6).

## Claims

### Claim 1

A load-adjusting quick cylinder comprising:
a cylinder base (6); a pump cylinder (9) disposed on a reverse side of the cylinder base (6); a pump core (8) disposed in the pump cylinder (9); and sequentially disposed from inside to outside, an outer piston rod (1), an outer piston rod cylinder (4) and outer casing (3),
wherein the outer piston rod (1) includes an inner piston oil chamber (11) that holds an inner piston rod (5); a main oil chamber (13) is provided between the outer casing (3) and the outer piston rod cylinder (4); an outer piston rod oil chamber (12) is provided between the outer piston rod cylinder (4) and the outer piston rod (1); and the inner piston oil chamber (11) and a pump cylinder oil chamber (10) are connected through a circulating oil passage in the cylinder base (6).

### Claim 2 (depends on 1)

The load-adjusting quick cylinder according to claim 1, wherein the circulating oil passage comprises:
an oil suction passage connecting the main oil storage chamber (13) and the cylinder oil chamber (10),
a first oil discharge passage connecting the pump cylinder oil chamber (10) and the inner piston oil chamber (11) and adapted for quick ejecting the inner piston rod (5) at light load;
a second oil discharge passage connecting the pump cylinder oil chamber (10) and the outer piston rod oil chamber and adapted for slow ejecting the outer piston rod (1) at heavy load;
an anti-overload return oil passage connecting the pump cylinder oil chamber (10) and the main oil storage chamber (13);
a refilling oil passage connecting the main oil storage chamber (13) and the outer piston rod oil chamber (12); and
an unloading returning oil passage connecting the main oil storage chamber (13) with the inner piston oil chamber (11) and the outer piston rod oil chamber (12) and adapted for unloading.

### Claim 3 (depends on 2)

The load-adjusting quick cylinder according to claim 2, wherein:
the cylinder base (6) further comprises an oil return slider mechanism (16), a pressure adjusting mechanism (17), a quick adjusting mechanism (18) a slow adjusting mechanism (19) and an oil refilling mechanism (20);
the pressure adjusting mechanism (17) is configured to control the opening and closing of the oil suction oil passage, the first oil discharge passage and the second oil discharge passage;
the quick adjusting mechanism (18) is configured to control the opening and closing of the anti-overload return oil passage;
the slow adjustment mechanism (19) is configured to control the opening and closing of the anti-overload return oil passage;
the oil replenishing mechanism (20) is configured to control the opening and closing of the unloading returning oil passage; and
the oil return slider mechanism (16) is configured to control the opening and closing of the anti-overload return oil passage.

### Claim 4 (depends on 3)

The load-adjusting quick cylinder according to claim 3, wherein:
the pressure adjusting mechanism (17) is disposed in a first vertically-opened four-stage boss-shaped hole with decreasing diameter that includes, from bottom to top, a third plugging steel ball (172), a second plugging steel ball (171), a second spring (173), a first limit steel ball (174), and a first adjustment screw (175); a fourth stage hole connects with the main oil storage chamber (13) through a main oil storage chamber oil outlet (22) and connects sequentially with a first middle flow passage (34) and the pump cylinder oil chamber (10) through a pump cylinder oil chamber main oil outlet (23); a second stage hole connects sequentially with the inner piston rod oil chamber (11) through the second middle flow passage (30) and an inner piston rod oil chamber oil hole (21);
the third plugging steel ball (172) moves up and down in a third stage hole to control the opening and closing of the third stage hole and the main oil-storing oil outlet (22); the second plugging steel ball (171) and the second spring (173) are disposed in the second stage hole; the first limit steel ball (174) is disposed in a first stage hole; the first adjusting screw (175) controls an initial position of the third plugging steel ball (172); the second spring (173) is connected to the third plugging steel ball (172) and the first limit steel ball (174); the third plugging steel ball (172) moves up and down in the second stage hole to control the opening and closing between the pump cylinder oil chamber main oil outlet (23) and the second middle flow passage (30).

### Claim 5 (depends on 3)

The load-adjusting quick cylinder according to claim 3, wherein:
the quick adjusting mechanism (18) is disposed in a second vertically-opened four-stage boss-shaped hole with decreasing diameter that includes, from bottom to top, a fifth plugging steel ball (184), a fourth plugging steel ball (183), a third spring (182), a second adjusting screw (185), and a first plugging screw (181); the outer piston rod oil chamber (12) connects with an outer piston rod oil chamber oil return hole (25) to control the opening and closing of the fifth plugging steel ball (184); and the fourth plugging steel ball (183), the third spring (182) and the second adjusting screw (185) control the opening and closing between the second middle flow path (30) and the outer piston rod oil chamber (12).

### Claim 6 (depends on 3)

The load-adjusting quick cylinder according to claim 3, wherein:
the slow adjustment mechanism (19) is disposed in a first vertically-opened three-stage boss-shaped hole with decreasing diameter that includes, from bottom to top, a sixth plugging steel ball (195), a second speed limit block (194), a fourth spring (193), a third adjustment screw (192), and a second plugging screw (191); a first anti-overload oil return hole (26) and the first middle flow passage (34) connect with the pump cylinder oil chamber (10); and the second speed limiting block (194), the fourth spring (193), and the third adjusting screw (192) are connected with the main oil chamber (13) through a second anti-overload oil return hole (27).

### Claim 7 (depends on 3)

The load-adjusting quick cylinder according to claim 3, wherein:
the oil-replenishing mechanism (20) is disposed in a second vertically-opened three-stage boss-shaped hole with decreasing diameter that includes a third plugging screw (201), an eighth plugging steel ball, and a seventh plugging steel ball (202); an oil refilling hole (29) connects with the main oil storage chamber (13); and an outer piston rod oil chamber oil outlet (24) connects with the outer piston rod oil chamber (12).

### Claim 8 (depends on 3)

The load-adjusting quick cylinder according to claim 3, wherein:
the oil return slider mechanism (16) is disposed in a mounting hole in the cylinder base (6) and includes an oil return slider main body (161), a pressure relief oil return button (162) disposed on the oil return slider main body (161), and, from bottom to top disposed in an internal passage of oil return slider main body (161), a first speed limit block (164), a first spring (163) a first plugging steel ball (165) and a transmission spring (167); the internal passage is a three-stage boss-shaped hole with decreasing diameter; an oil return hole (28) connects with the main oil storage chamber (13); and the transmission spring (167) connects with the pressure relief oil return button (162) and the first plugging steel ball (165) at both ends.

### Claim 9 (depends on 8)

The load-adjusting quick cylinder according to claim 8, wherein the first speed-limiting block (164) is a speed-limiting block in which arcuate passages are provided on left and right sides thereof.

### Claim 10 (depends on 1)

A hydraulic lifting device comprising the load-adjusting quick cylinder according to claim 1.