CN2229509Y

CN2229509Y - Self-controlling hydraulic companion ladder

Info

Publication number: CN2229509Y
Application number: CN 95209483
Authority: CN
Inventors: 王建庆; 王晓龙
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-02
Filing date: 1995-05-02
Publication date: 1996-06-19
Anticipated expiration: 2005-05-02

Abstract

The utility model discloses a self-controlling hydraulic lifting ladder which is mainly composed of a hydraulic controlling part and a lifting supporting part. The hydraulic controlling part is composed of a controlling block and an operating cylinder. The controlling block comprises two one-way valves and a pressure releasing loop. The lifting supporting part is mainly composed of a scissor-type lifting frame, a slide way, a pedal plate and a connecting rod. One end of the scissor-type lifting frame is connected with a piston shaft of the operating cylinder. A piston moves in the operating cylinder to drive the scissor-type lifting frame to ascend and descend. The hydraulic controlling part and the pedal plate are installed together. The utility model has the advantages of convenient lifting operation, simple control, large working area, etc.

Description

Autocontrol hydraulic lifting ladder

The utility model relates to a kind of lift, particularly a kind of autocontrol hydraulic lifting ladder.

In existing ladder, the work plane above the double ladder is too little, and place tool and worker are in the work plane operational difficulties, and height adjustment range is less.

Though aluminium alloys extension ladder height adjustment range is bigger, does not have work plane, can't place tool, very inconvenient when the staff works.

Also has a kind of scissor lift platform, its main support part also is a scissors-type lifting, adopt the Driven by Hydraulic Cylinder scissors-type lifting, its hydraulic system drives lifting platform by the action of oil pump driving oil cylinder, but because its volume is big, it is overweight to conduct oneself with dignity, move difficulty, must load with car and carry, be subjected to certain limitation so use.

The purpose of this utility model will provide a kind of exactly can not only freely control height and the bigger autocontrol hydraulic lifting ladder of work plane by the operator on ladder.

The technical solution of the utility model is achieved in that autocontrol hydraulic lifting ladder supports the two large divisions by hydraulic control and lifting and forms.Hydraulic control partly is installed in below the foot rest of lifting support section, the controll block of hydraulic control part is in the same place with bolt and cylinder seal with end cap, gap between controll block and oil cylinder and end cap and the oil cylinder is sealed by sealing mat, the axis of the piston passes from end cap, the axis of the piston passes from end cap, the axis of the piston is divided into two oil closed cavities with oil cylinder, and the gap between piston and the oil cylinder is sealed by piston packing, and the gap between the axis of the piston and the end cap is by gland and sealing ring sealing.Be processed with a blind hole in the controll block, be blind hole and a through hole, there are two inclined holes to be communicated with between two holes, being processed with an aperture perpendicular to the direction of two inclined hole axis and through-bore axis is communicated with inclined hole and oil cylinder, the pressure oil column of packing in oil return post and the through hole of wherein packing in the blind hole, when depressing oil column, the in-oil cylinder pressure oil of no piston axle head is inhaled in the cavity of pressing the formation of oil column top, owing to press in the oil column steel ball be installed, the one way valve that spring and hollow bolt are formed, so the pressure oil below the pressure oil column is compressed, and can not flow backwards, interior through following hollow bolt by steel ball, the one way valve that spring and double end hollow bolt are formed has entered piston axle head oil cylinder, make piston motion, the axis of the piston shrinks, unclamp press oil column after, press oil column under the effect of spring, to rise, press oil column upper pressure oil to enter and press below the oil column, when depressing oil column again, repeat a process through overvoltage oil column internal check valve.When depressing the oil return post, be communicated with inclined hole and axial hole in the oil return post by the inclined hole of oil return post shutoff, form a drainback passage with another inclined hole, pressure oil is through this passage release, piston motion, the axis of the piston stretches out, and autocontrol hydraulic lifting ladder descends; When unclamping the oil return post, the oil return post rises under the spring action that is enclosed within its neck, and the shutoff inclined hole keeps height again.

The lifting support section becomes two row scissors cross arrangement feet pedals by four groups of support bars, and two struts of being disbursed from the cost and expenses are flexibly connected by connecting rod, to increase the stability of ladder.By two fixed feet and two movable legs that can roll, movable leg can slide on slideway below.When the axis of the piston shrinks, the pull-up support bar, movable leg inwardly slides along slideway, and autocontrol hydraulic lifting ladder rises; When the axis of the piston stretches out, put down support bar, movable leg outwards slides along slideway, and autocontrol hydraulic lifting ladder descends.

The utlity model has following advantage: work area is big, and the worker can freely control lifting, rising or falling speed and height on ladder.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is an autocontrol hydraulic lifting ladder hydraulic control part-structure schematic diagram.

Fig. 2 is an autocontrol hydraulic lifting ladder controll block structural representation.

Fig. 3 is an autocontrol hydraulic lifting ladder perspective view.

Fig. 4 is an autocontrol hydraulic lifting ladder hydraulic control part scheme of installation.

With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4.Autocontrol hydraulic lifting ladder supports the two large divisions by hydraulic control and lifting and forms.Hydraulic control part (35) is installed in below the foot rest (9) of lifting support section.The controll block (1) of hydraulic control part (35) links together with bolt with oil cylinder (2), seal oil cylinder (2) with examining the end cap (3) that is installed in oil cylinder (2) other end with spiral shell equally, sealing mat (7) sealing is all used in gap between gap between controll block (1) and the oil cylinder (2) and end cap (3) and the oil cylinder (2), piston (4) is contained in the oil cylinder (2), the axis of the piston passes from end cap (3), gap between end cap (3) and the axis of the piston is by gland (5) and sealing ring (6) sealing, piston packing (8) is contained on the piston (4), prevents in the oil cylinder (2) that the pressure oil that is divided into two chambeies by piston (4) interpenetrates.Be processed with a blind hole (33) in the controll block (1), i.e. a blind hole and a through hole (32) are equipped with oil return post (15) in the blind hole (33), and oil return post (15) axially is equipped with an aperture (30), and the inclined hole that radially to be processed with two angles be the right angle is as back oil road.Gap between oil return post (15) and the blind hole (33) is by hollow bolt (16), rubber pad (17), pad (18) sealing, and oil return post (15) neck reinstalls a spring (20).An end is equipped with and presses oil column (19) in the through hole (30), press in the oil column (19) and axially be processed with stepped hole (31), and largest hole is processed into screwed hole, press oil column (19) neck to reinstall a spring (20), press to be respectively charged into steel ball (21), spring (22) in the oil column (19) and to screw in hollow bolt (23), press oil column (19) radially to process an aperture that communicates with the minimum aperture of axial step hole (31) and make oil inlet passage.Through hole (32) other end screws in hollow bolt (27), and use rubber pad (26) to seal, in hollow bolt (27), be respectively charged into steel ball (24), spring (25), add rubber seal with a double end hollow bolt then, the double end hollow bolt other end has been connected to piston axle head oil cylinder with pipe.Be processed with two inclined holes (28) and (29) between through hole (32) and the blind hole (33) as crossing oily passage.

After depressing oil column (19), steel ball (21) forms an one way valve with spring (22), make from the pressure oil below the steel ball (21) and be pressed into cavity below the steel ball (24), promptly be pressed in the oil cylinder of the axis of the piston side, piston (4) is shunk, simultaneously, the pressure oil in another sealed cylinder is inhaled in the above cavity of steel ball (21).Piston retraction, pull-up support bar (10), fixed feet (12) is motionless, movable leg (13) is inwardly gone up at slideway (14) and is slided, rise ladder, the supported bar of foot rest (9) (10) supports as work plane, connecting rod (11) is strengthened the contact between the support bar (10), increase the stability of autocontrol hydraulic lifting ladder, after unclamping pressure oil column (19), press oil column (19) under the effect of return spring (20), to rise, the above pressure oil of steel ball (21) is depressed steel ball (21) and is entered cavity below the steel ball (21), for press oil to prepare next time, steel ball (24) and spring (25) are formed an one way valve, so the pressure oil in the axis of the piston side cylinder can not reflux.

When depressing oil return post (15), be that the inclined hole at right angle is communicated with in the controll block (1) by the interior angle of the inclined hole (28) of oil return post (15) shutoff and oil return post (15), and be communicated with by the interior inclined hole (29) of the inclined hole in the oil return post (15) and aperture (30) and controll block (1), two inclined holes (28) are connected two oil pockets that are divided into by piston (4) in the oil cylinder (2) with (29), form depressurized circuit thus, autocontrol hydraulic lifting ladder slowly descends; When unclamping oil return post (15), oil return post (15) rises under the spring action the same with return spring (20), inclined hole (28) is by shutoff again, depressurized circuit disconnects obstructed, autocontrol hydraulic lifting ladder stops to descend, keep present level, if continue to push down oil return post (15), then autocontrol hydraulic lifting ladder is reduced to minimum altitude.

Claims

1, a kind of autocontrol hydraulic lifting ladder, comprise hydraulic control and lifting support two large divisions, hydraulic control part (35) is installed on below the foot rest (9) of support section of autocontrol hydraulic lifting ladder, foot rest (9) is arranged in two row scissors cross support by four groups of support bars (10), support bar (10) is flexibly connected by connecting rod (11), two fixed feet (12) and two movable legs (13) that can roll are arranged below, movable leg (13) is gone up at slideway (14) and is rolled, and it is characterized in that:

The two ends that the controll block (1) of hydraulic control part and end cap (3) are installed in oil cylinder (2) respectively, piston (4) is installed in the oil cylinder (2) oil cylinder (2) is divided into two enclosed cavities, the axis of the piston passes from end cap (3), and by gland (5) and sealing ring (6) sealing, the sealing mat that seals (7) is contained between controll block (1) and the oil cylinder (2) and between end cap (3) and the oil cylinder (2), piston packing (8) is contained on the piston (4).

2, the described autocontrol hydraulic lifting of root a tree name claim 1 ladder, it is characterized in that: controll block (1) is processed with a blind hole (33), a hole of promptly not getting through and a through hole (32), between blind hole (33) and the through hole (32) two inclined holes (28) are arranged, (29), on inclined hole (28), also be processed with a fuel feed hole (34) with two inclined holes (28) and (29) axis and through hole (32) axis normal, this fuel feed hole (34) is communicated with oil cylinder, press oil column (19) to be contained in the through hole (32), pressing oil column (19) is a step axle, reinstall a spring (20) at its neck, inner shaft is to being processed with stepped hole (31), maximum hole is a screw, radially being processed with a through hole is communicated with the minimum aperture of stepped hole (31), in pressing oil column (19), be respectively charged into steel ball (21), spring (22) and hollow bolt (23), press the gap between oil column (19) and the through hole (32) rubber pad (17) to be pressed on upward sealing of packing ring (18) by hollow bolt (16), the other end of through hole (32) seals the steel ball (24) of packing into successively in the hollow bolt (27) with hollow bolt (27) and rubber pad (26), spring (25) and a double end hollow bolt; Oil return post (15) is packed in the blind hole (33), return spring (20) is also installed by oil return necking portion, oil return post (15) axially has an aperture (30), the aperture that other has two angles is the right angle is communicated with aperture (30), and oil return post (15) uses hollow bolt (16), rubber pad (17), packing ring (18) sealing with the gap of blind hole (33).