CN2161599Y

CN2161599Y - Hand-operated hydraulic transportation vehicle

Info

Publication number: CN2161599Y
Application number: CN 93225979
Authority: CN
Inventors: 梁木荣
Original assignee: HANGZHOU HYDRAULIC TOOLS GENERAL FACTORY
Current assignee: HANGZHOU HYDRAULIC TOOLS GENERAL FACTORY
Priority date: 1993-07-05
Filing date: 1993-07-05
Publication date: 1994-04-13
Anticipated expiration: 2003-07-05

Abstract

The utility model discloses a hand-operated hydraulic transportation vehicle, and the utility model is composed of front wheels, a fork mounting for goods, rear wheels, a base, a lifting oil cylinder, a working oil pump and a joy stick, wherein, a lifting and lowering control valve is arranged in the working oil passage of the base, and the lifting and lowering control valve comprises a valve core. A step-shaped axial oil through hole and a radial oil hole are arranged on the valve core, and a speed limiting hole is arranged in the axial oil through hole. The utility model has a lifting gear, a rapid descending gear, a slow descending gear and a no-load gear; not only the work efficiency of the utility model is effectively improved, but also the utility model puts an end to all accidents which can occur during an unloading process.

Description

Hand-operated hydraulic transportation vehicle

The utility model relates to a kind of handbarrow that manually hoists.

The manual type transport trolley is a kind of handbarrow that hoists commonly used in present factory floor, the warehouse.Existing manual type transport trolley generally is made up of parts such as front-wheel, trailing wheel, goods shelf, lift oil tank, joysticks.This manual type transport trolley is not owing to being provided with failure-free oil cylinder lifting speed-limit device, so very not steady in the working process.Particularly when bringing onto load descended, the speed of its decline was controlled with the experience of operating personal entirely, thereby careless slightly, and accident will meet accident.

In view of the problem of above-mentioned existence, the purpose of this utility model provides a kind ofly can arbitrarily control the hand hydraulic carrier of oil cylinder rising or falling speed according to its working condition requirement.

Design plan of the present utility model is: add a lift controil valve in the base working oil path of hand hydraulic carrier.Be provided with a speed limit oilhole and a spacing control pin at the lift controil valve in-core.Spacing control pin is according to the working condition of hand hydraulic carrier, the rising or falling speed of lift oil tank is divided into hoist, descend fast, four gears such as decline, neutral gear at a slow speed.Thereby not only solved the speed governing lifting problem of hand hydraulic carrier lift oil tank effectively, and thoroughly stopped the generation of the contingency that hand hydraulic carrier may cause in bringing onto load decline process.

Specific embodiments of the present utility model is as shown in drawings:

Fig. 1 is an appearance structure scheme drawing of the present utility model

Fig. 2 is the structural representation of the utility model joystick part

Fig. 3 is the structural representation that is installed on the lift controil valve in the utility model base working oil path

Below with reference to the accompanying drawings embodiment of the present utility model is elaborated:

Hand hydraulic carrier comprise front-wheel 1, goods shelf 2, trailing wheel 3, base 4, lift oil tank 5, work oil pump 6, joystick 7, etc. several parts.In the working oil path of base 4, be provided with a lift controil valve.Lift controil valve is installed on lift oil tank 5 and the working oil path of work between the oil pump 6, and it contains the spool 17 that one one end is cone, and the front portion of valve core cone is provided with O-ring seals 16.At the axial position of spool 17, be provided with a stepped oil through 19, at an end of oil through 19, a spacing control pin 15 is installed, the two ends of spacing control pin 15 are respectively arranged with a check valve 14,18.In stepped oil through 19, be provided with throttling channel 20.Throttling channel 20 constitutes the speed limit hole with steel ball 21, spring 22.Spring 22 by nut 23 location, regulate, and it is sealed by nut 25 packing rings 24.Radially position at spool 17 is provided with oilhole 26.Oilhole 26 1 ends directly communicate with lift oil tank 5 by oil circuit C, and the other end communicates with work oil pump 6 through oil circuit B by axial oil through 19.

The working process of lift controil valve is by the transfer bar mechanism control of an end that is arranged at check valve 14.Transfer bar mechanism is made up of push rod 10, spring 13, seal ring 12 and rubber choker block 11, and an end of push rod 10 is connected by connecting rod mechanism 9 gear handles 8 direct and on the joystick.Gear handle 8 common formations on lift controil valve and transfer bar mechanism, connecting rod mechanism 9 and the joystick manually surge the hoisting of transport trolley, descend fast, four gears such as decline, neutral gear at a slow speed.

The hoisting of hand hydraulic carrier, descend fast, descend at a slow speed, the neutral gear mode of operation is achieved like this:

When the gear handle 8 on the joystick was in the I shelves, promptly 10 pairs of check valves 14 of push rod were inoperative, and lift controil valve is in the P PARK Position P that hoists.At this moment, if upper and lower pressing joystick 7, oil pump 6 work of then working.During work oil pump 6 oil suctions, check valve 14 is opened, and power fluid sucking-off in the fuel tank is in oil circuit A enters the pump chamber of work oil pump 6.When 6 compressions of work oil pump, check valve 14 is closed, pressure oil is through oil circuit B and promote spacing control pin 15 and back down check valve 18, steel ball 21, axial step shape oil through 19, the radial direction oil hole 26 of pressure oil in spool 17, C enters lift oil tank by oil circuit, the promotion piston rises, and finishes its motion that hoists.

When the gear handle 8 on the joystick was in the II P PARK Position P, promptly push rod 10 backed down check valve 14, made check valve 14 be in normally open, and lift controil valve then is in Neutral Position.At this moment, if upper and lower pressing joystick 7 though 6 work of work oil pump because check valve 14 is inoperative, do not produce pressure oil in the working oil path, backs down check valve 18 so can't promote spacing control pin 15.Like this, the power fluid that pumps from work oil pump 6 is directly got back to fuel tank through oil circuit A.Be that lift oil tank 5 is not worked, be in neutral state.

When the gear handle 8 on the joystick is in the III P PARK Position P, be that push rod 10 backs down check valve 14, check valve 14 promotes spacing control pin 15 and backs down check valve 18(

check valve

14,18 and open simultaneously) time, lift controil valve then is in the gear (bringing onto load descends at a slow speed) that descends at a slow speed.At this moment, pressure oil in the lift oil tank 5, through oil circuit C by the radial direction oil hole 26 on the spool 17, enter in the oilhole 19 of axial step shape, pass through the speed limit hole that constitutes by throttling channel 20, steel ball 21, spring 22 then, through the check valve of opening simultaneously 18,14, A gets back in the fuel tank lentamente by oil circuit.Lift oil tank slowly descends.

When the gear handle 8 on the joystick is in the VI P PARK Position P, promptly not only push rod 10 backs down check valve 14, locating dowel pin 15 backs down check valve 18(

check valve

14,18 and opens simultaneously), and, check valve 18 backs down steel ball 21, make the speed limit hole of lift controil valve ineffective, at this moment, lift controil valve is in quick-drop catch (zero load descends fast).At this moment, the pressure oil in the lift oil tank 5 is through oil circuit C, the radial direction oil hole 26 on the spool 17, and axial step shape oil through 19, the

check valve

18,14 of Kai Qiing through oil circuit A oil return apace, reaches the lift oil tank purpose of decline fast simultaneously.

Hand hydraulic carrier compact conformation, reasonable, be arranged at lift controil valve in the base working oil path be skillfully constructed, multiple functional, installation, maintenance is convenient, safety of operation, reliable, it has not only improved hand hydraulic carrier-work efficiency effectively, and has thoroughly stopped contingent contingency in uninstall process.

Claims

1, a kind of front-wheel (1) that includes, goods shelf (2), trailing wheel (3), base (4), lift oil tank (5), work oil pump (6), the hand hydraulic carrier of joystick (7), it is characterized in that in the working oil path of this hand hydraulic carrier base (4), be provided with a lift controil valve, lift controil valve contains the spool (17) that one one end is cone, axial position at spool (17), be provided with a stepped oil through (19), end at oil through (19) is equipped with a spacing control pin (15), in stepped oil through (19), be provided with throttling channel (20), throttling channel (20) and steel ball (21), spring (22) constitutes the speed limit hole, is provided with oilhole (26) at the radially position of spool (17).

2, hand hydraulic carrier according to claim 1, it is characterized in that gear handle (8) on described lift controil valve and transfer bar mechanism, connecting rod mechanism 9 and the joystick common constitute hoist, descend fast, four gears such as decline, neutral gear at a slow speed.

3, hand hydraulic carrier according to claim 1 is characterized in that the two ends of described spacing control pin (15) respectively are provided with a check valve (14), (18).