CN85102782A

CN85102782A - Counterbalanced lift truck: socket type with single upright column pallet fork lift assembly

Info

Publication number: CN85102782A
Application number: CN 85102782
Authority: CN
Inventors: 沈炎源
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-04-01
Filing date: 1985-04-01
Publication date: 1986-01-10

Abstract

This programme is satisfying under the commercial performance prerequisite of the door frame of fork truck, pallet fork, mainly contains the superior operation visual field, can improve the operation judges correctness, alleviate operator's fatigue, pallet fork jacking system assembly is from heavy and light, fork truck complete machine deadweight factor of utilization improves the batch manufacturing low cost of manufacture.

New construction adopts socket joint type hollow rectangle column, and fork truck anti-bias load ability when load is improved, and the structural entity good rigidity solves the inclined to one side load-bearing capacity of the anti-level of structure emphatically, adopts new structure basically entirely at the crotch assembly that hoists.

Description

Counterbalanced lift truck: socket type with single upright column pallet fork lift assembly

Single column pallet fork lift assembly research of counterbalanced lift truck.This programme is satisfying the door frame of fork truck, under the serviceability prerequisite of pallet fork, mainly contains following advantage:

1. the operation judges correctness can be improved in the superior operation visual field, alleviates operator's fatigue, makes job safety rapid.

2. the deadweight of pallet fork jacking system is the lightest, and fork truck complete machine deadweight factor of utilization improves.

3. batch manufacturing low cost of manufacture.

Principle of work (Fig. 1)

1. pallet fork hoists: the piston rods 25 in the lift oil tank 5 rise, and sprocket wheel beam 1 outer principal post 7 is also risen synchronously, spur the square crotch 11 that hoists by sprocket wheel 2 chain 4 actions that hoist, connect box-shaped pallet fork beam 16, pallet fork chute 12 hoists pallet fork 15, (pallet fork locating dowel pin 13)

2. goods descends: the partial component potential energy by hoisting system reduces, and piston rod 25 is descended, and (chain rod 19 other ends are fixed on the propons and are failure to actuate) descends to reach pallet fork.

3. pallet fork upwards, downward-sloping (leaning forward hypsokinesis): by dump ram 20 actions, the effect fulcrum is on inner column inclination bearing 26, column bearing 14 is hinged on the propons 24 by stud location pin 23, and propons is rigidly fixed on the vehicle frame 21 by bolt 27 connections.

4 overcome level loads partially:

The level definition of loading partially: in the forklift-walking positive dirction, the pallet fork assembly that hoists runs into (being as the criterion with the column vertical center line) unbalanced application force.

(1) pallet fork is got goods, unloading or unbalance loading (when referring to that column has the inclination angle), when the generation level is loaded (amounting to moment of torsion) when little partially, level load is partially passed through box-shaped pallet fork beam 16, the square crotch 11 that hoists pass to balance spring bear (being described in addition during design) make level partially load by the roller chain bearing 18 that hoists the opposite sense positive pressure is acted on a left side respectively, the right side hoists on the roller, to guarantee pallet fork square hoist crotch 11 and outer column 7 fricton-tight frictions when rising.

(2) pallet fork pushes away goods or runs into bigger level a period of time of hauling goods when loading partially, when certain value is arrived in the balance spring strain, the roller hinged-support axis that hoists has inboard four limits of the at this moment square crotch that hoists of relative corner to contact with outer column with the square crotch 11 that hoists, with the transfer torque form, make the inclined to one side load of level be transformed into the form of moment of torsion by outer column 7, sliding

lining

3 and 22, inner column 6, free bearing 14 is delivered on the propons 24 again under the inner column.

When the inclined to one side load of level is varied down to certain value or disappears, the balance spring resilience, maintenance is with paralleling to the axis substantially with pallet fork beam 16 for the roller hinged-support 18 that hoists, and the square crotch 11 that hoists does not have direct contact with outer column 7 yet.

Design accessible:

1. increase a lift oil tank, fork goods can reach part play motion and full play motion.

2. pallet fork (the same with mast forklift truck) can be regulated maximum, and minimum zone is fit to all kinds of riggings and is used.

Single column pallet fork lifting mechanism improves the forklift workability visual field:

It is important indicator of fork truck design-calculated that the forklift workability visual field is considered.Emphasis improves the forklift operator visual field.Make moderate progress as lift oil tank being configured in door frame rear side (Fig. 4) visual field, (pallet fork 1 among Fig. 4, channel-section steel 2, lift oil tank 3, the chain 4 that hoists)

But adverse factors occurs, originally a lift oil tank changes two into, and the cargo load center of gravity increases with an outer oil cylinder ranging coverage, and like this to door frame, the roller stress that hoists is unfavorable.The operation visual field of fork truck is that the operator is concerned about, the driver has unobstructed sight can make forklift workability safety quick, reduces tired in frequent operation.

The outstanding forklift workability visual field problem (Fig. 2) that solves of this programme, I is visible field of vision, and II is (head moves 300 millimeters) mobile field of vision, and III is a blind area.Be better than (Fig. 3, Fig. 4) structure from the resistance rate of looking of (Fig. 2) structure.From the optic radiation of (Fig. 2), the driver sits and just sees two pallet forks knowing, to the fork truck discharge of cargo, operating efficiency can both improve, and we can say that this structure can make forklift workability that optimum field is arranged like this.

Single column and the stressed overview of door frame:

1. the frequent unbalance loading of forklift workability, single tine hooks goods, and long goods center of gravity can not correctly determine to cause serious unbalance loading.From door frame (Fig. 7) (5,6,7,8 is the door frame combined member), under the uneven loading action of g, P ₁Be oil cylinder piston masthead power, (two of Fig. 4 cylinder oil circuit that hoists communicates too, can be considered P ₁Top power) side guide wheel produces P ₂Application force, from the y axle resistance to bending of door frame channel-section steel (Fig. 8) a little less than, cause the very large deformation of structure.The cross section of single column is stronger to bearing the unbalance loading ability at y axle resistance to bending better (Fig. 6).

2. the basic load of forklift door frame is the application force of 9 pairs of door frame inner wings of guide wheel edge of hoisting, and crotch descends and stops suddenly again during special full and down, at this moment P ₃Dynamic load effect power bigger, simultaneously channel-section steel is produced an off-centre (t.t ₁) distance, the relatively poor torsional shear stress that causes of channel-section steel class opening section anti-twisting property is big.P ₃Effect web thickness is increased, the stressed complexity of channel-section steel, this is that door frame integral body is from one of great principal element.Single column cross section (Fig. 6) is at the x axle, and y axle resistance to bending is stronger, and the closed cross-section anti-twisting property is good, and whole structural stability is also fine, adopts the whole stressed improvement of chain rod.The design: the guide wheel 10 that hoists acts on the edge of a wing of web center line, and the less cross section reasonableness that makes of size Selection of web 6 is improved.The lightest to reach the deadweight of pallet fork lifting mechanism, cause fork truck ratio of light weight to loading capacity degree of utilization the highest.

Claims

The present invention is used for all kinds of fork trucks (industrial vehicle) of Mechanical Driven operation, can replace mast forklift truck pallet fork lift assembly.

New construction has socket joint type hollow rectangle column, and column directly is hinged on the propons, and chain rod is arranged, pallet fork pocket for the punch head, box-shaped pallet fork beam.The inclined to one side load mechanism of anti-level has the square crotch that the hoists roller free bearing that hoists.