DE1922486C - Hydraulic telescopic extension boom - Google Patents

Description

solution

The invention relates to a hydraulic telescopic extension boom with one consisting of at least two hydraulically interconnected cylinders Extension stage, the cylinders being arranged parallel to one another and their extension spaces are connected by a hydraulic line, with a prestressed and a non-prestressed Check valve is provided, the check valves opening in opposite directions are arranged, and their entry spaces are also connected by a hydraulic line are, the hydraulic lines through the bored piston rod of the one Lead reciprocating piston, and the end of a reciprocating piston rod with the boom arm part and the end the other piston rod is connected to the extension stage.

The state of the art are telescopic extension arms known, either by a direct telescopic cylinder or by coupled cylinders can be extended and retracted. There are also complicated circuits known in deneu the cylinders are switched so that they extend one after the other by means of a drag linkage or the like.

With the normal series connection of two cylinders, it is a matter of luck which cylinder comes first comes out and which one comes in first. From the point of view From a static point of view, however, it is better that the step with the larger dimensions extends and then only extend the thinner steps, and that the order is reversed when reinserting them.

So it is known to have the all-speed steps as desired To reverse sequence by working with a ratchet mechanism that the Approach levels locked in the desired sequence.

There is a disadvantage of this known device

been that the circular ring surfaces of the reciprocating pistons

have different areas, whereby the ring area of the first returning ben is larger.

An advantage after the
is that outside

so casually no annoying inputs "

and that the wrench extension through the u »v ™ arrangement of a preloaded check valve ^{: is} achieved below the hydraulic line and yes, the extension stages are inevitably retracted in

the desired sequence caused by the different areas of the reciprocating pistons w> approx Since the weaker dimensioned step can be optimally dimensioned small due to the inevitable extension as it can only ever carry the load of the larger

needs to carry a charge, the piston ring surface is

correspondingly larger, so that at the same pressure s »i, f

the circular ring areas the total force on the variable rcn

Ring area is also correspondingly larger. An embodiment, from ^{Hem e5r} *

inventive features are shown. It shows

F i g. 1 shows a section through the hydraulic coupling part of the first extension stage, F i g. 2 is a side view of the extended

Exit steps,

F i g. 3 circular ring surfaces of the coupled reciprocating pistons (schematic),

F i g. 4 shows a longitudinal section through the entire telescopic extension arm (Rest position),

5 shows a schematic cross section of the cylinder with the hydraulic lines and

F i g. 6 a schematic drawing of the telescopic extension arm with its hydraulic lines and Valves.

The in Fig. The coupling part shown in FIG. 1 shows the two coupled cylinder chambers 3 and 5 with the reciprocating piston rods la, 6a arranged in them and the reciprocating piston 1,6 arranged thereon. The reciprocating piston rod la and the reciprocating piston 1 are pierced

and take the pressure line 15 on. The piston rod is used for re-inserting the extension steps la also pierced for the supply line 2. The end wall of the piston 1 facing Side is pierced and takes the screw-in connector of the hydraulic line 9, the opposite Rear wall 13 is guided and there in the Zy-Iinderrauni5 joins. The preloaded check valve 7 is installed in the hydraulic line 9. Upper the hydraulic line 4, the two circular ring surfaces are connected to their corresponding spaces. The non-pretensioned check valve 8 acting in the opposite direction is installed in the hydraulic line 9 α and bridges the pre-tensioned non-return

³ -,,. «Hen can. This then pushes the

veuü7.Fig. 2 shows the portion wound the two beniJ ^ i ^ * ^ desired position.

Extension stages 11 and 12. ^^ Sr ^ HubSbenl located hydraulic F i g. 3 indicates the size changes in the Das P ™? ⁰ *? ^ _jde . _itm a2 back into the oil tank

two arranged in the cylinder chambers 3 and 5 "köl vor j ^ ™ ⁵ ^ _that behind the reciprocating piston 6

Circular ring surfaces of the reciprocating pistons 1 and ·, 5 printed. &**> *? ™ S | via the hydraulic line 4 Fig. 4 shows the entire unit in the compressed ^ "',, S pushed back into the oil tank.

pushed state. The figure becomes the arrangement and the 2 """""!^" L _n ^ extension stages

tion of the fixed points 14 and 14a of the two reciprocating ^, ^^^ idbt ^ ezeichiietes control valve

1 d 6 ihtlih Di Hbkolben ^Dnwk ? ^1ubCTem JSL ^ di hydraulic line 4

tion of the fixed points 14 and 14a of the two Hubkol ^, ^^ idbt ^ ezeichiietes control

benstangen 1 α and 6a can be seen. The reciprocating ^Dnwk ? ^{1st ubCT} - ^em JS «L ^ Jber the hydraulic line 4 rod 1 β is with the arm part 10 and the Hubkolbeo-» o the supply line 2 SPge "=" · _{& 1ίηαβπ3ϋΐη of} the extension rod 6fl is firmly connected to the extension stage 12. sets ^ / ~~ | "j '! £ L these due to the larger

Rod 1 β is with the arm part 10 and the _{Hubkolbeo & 1ίηαβπ3ϋΐη} the Ausfa rod 6fl is firmly connected to the extension stage 12. sets ^ / ~~ | "j '! £ L this, due to the larger The TeleskopaussclKib-Ausleger works fol- & ύ * ^ ² 5? STdSSSSeIiS 6, first in the outward direction: That of a not drawn circular surface of the ^ ⁰ ^ _Hubto iben 6 pressure coming in his pump flows through the DnK * - gangssieUung. Em w ^^ _ß ^^^ ^ moves line 15 through the piston rod la and the 15 E ⁰ ^ ¹¹ J *? ⁸ fVT, " _it the one arranged in it Aus-Hubkdben 1 and pushes the starting steps 11 the A "? *? ^ HJJLa _i0 in the rest position and 12 out of the part 10. Push the back wall 13 speed step 12 m the arm«

and the annular surface of the reciprocating piston 1 together, jerk. structural design and attachment

that is, the maximum extension of the extension stage 11 is In f 1 g. 3 "" ^ iKkleituneen 4,9 and 9 σ as well as the

is enough, the pressure in the cylinder chamber increases further *> Order of the "^^" «n ^ ijagvenule 7 and 8

and accordingly also in the hydraulic line 9 so arranged in them kuc -6

far that the resistance of the hydraulic system is obvious. schematized entire oil

ordered and preloaded check valve 7 ^{F lfr} w £ _r individual extension stages 11, 12 on.

is overcome and the oil flow before the piston flow of the individual λ

1 sheet of drawings

Claims (1)

Hydraulic telescopic extension boom with an extension stage consisting of at least two hydraulically connected cylinders, the cylinders being arranged parallel to each other and their extension spaces being connected by a hydraulic line which is provided with a preloaded and a non-preloaded check valve, the check valves and each other opposite opening direction are arranged, and their entry stroke spaces are also connected by a hydraulic line, wherein the hydraulic lines duich the bore piston rod of the one reciprocating piston, and the end of one reciprocating piston rod is connected to the cantilever arm part and the end of the other reciprocating piston rod is connected to the extension stage, characterized in that the circular ring surfaces of the reciprocating pistons (1, 6) have different surface areas, the circular ring surface of the reciprocating piston first retracting being larger. ^^ S ^ Säß based on the task of creating a ^ ,, TJSn ^ flSausBchub-Aiisleger the pre-1 *** ™haben ^ * ^, which the entry and exit * ™ ^ntea . "2Tffwtufen in the desired series ^ ** £££ 2 &Α". without any locking devices that can be towed, rod or ™ "JP ™ * J ~" \ ^ _he ending is