DE2147935C3 - - Google Patents

Description

2. Impact .erkz.eug according to claim 1, characterized in that the S'-uersehieber l22) of the main control valve (21, 22) can be actuated by pressure medium. whose ZuIIu '' to the main control valve (21. 22) is controlled via pilot valves (29. 30). which are in communication with the pressure chamber (13) or with the lower end (10 * /. 10 b) of the working chamber (10 * 7. 10Λ. IQd) by means of pressure medium.

3. Impact tool according to claim 1 or 2, characterized in that the pressure medium for Actuation of the impact tool is a liquid and the compressible pressure medium is a gas.

4. Impact tool according to claim 1 or 2, characterized in that the pressure medium for Actuation of the striking tools a liquid and the compressible pressure medium a similar one Liquid is.

5. Striking tool according to one or more of claims 1 to 4, characterized in that that the pressure medium-controlled pilot valves (29, 5c, 30) have a delay characteristic.

6. Striking tool after one or more of claims 1 to 5, characterized in that the pressure chamber (13) with a filling device (40 (7) for filling with a compressible Pressure medium is provided.

the return stroke is immersed and the stroke d..s KULKnuLc _{Sch! ai} , stroke with pressure beaut-

ί: IE rÄÄ- return stroke of the Sclilag ^ l- ^^ eaufschlagte ^ e.skan ^ r ^ er ^^ - Z,

KiSÄr ¹ 'send Steuervcnti.vornchu ": vcri-mden is. Such striking tools will end at-niclsw ^ e for driving in a knife m, \\ t ri-.i χ - λ, in particular

;:; "V ^N ^ nernoder ^L Aerembrechen von Rock Vh .:, cn Schla-werkzeu-en of the kind mentioned

■ ^ π rfmi mTitelbdrittenc Schlagwerk / eu.e ^, nnl'ti ^ uher ^ nd under the striking head ^K _n ,, _L , working chamber.! alternating with

γΓ "· η I h-iufschl-1'nv \ ground and the pressure ^Dr ul T -LnV 'u ,, will Since these Sch a -! ^ TXfu the pressure medium / uführ and printing center n -

abln.ir two

_{scstc ;:} ert who

abln.ir two ^u , ^, '; _{Orl] dnli} i, _cls i _alcru , _v; h _lcv mi.LL jieMJ te see. Schlaewerkzeue der

even more complicated. J ^. ^^ ^ 5 _ruckmuK ,,,, _; at the beginning ^ nam u. · Laboratory

! clock and pressure, «- '« J _while the pressure is controlled to ue ^ nr ■ ^ Schla.ko'

chamber .n the da- ^ULk ' _b ^ _{in (aucht} . ^ _noi , _uv , bens while d, s Ku.Knm e
Pressure medium ^> f ^ ^

With the known

Sch.a, ko.bcn "ijt Moucrkama, ^

W cge des Schlagkollvns "> - ^" ^u ^ V

he V

V 01! '.' Il

to .-. at; -

thereby the>
Druckminel / ufluü of the work

^ ¹

60

The invention relates to an impact tool with a piston-cylinder unit which is actuated cyclically by pressure medium and which has a pressure chamber into which the rear end of the impact piston during the near the disadvantage ολ U>
gp is. that the Schlagkoltx
Stroke shifted w, rd.AuB ^
acting ^ J ^

one extraordinarily ^
setz ,, because because of the large Ph ^ .geschNNm ^ gke, en zj Kav. honing phenomena and those associated with them. stubborn erosion is coming

So you have to give the _a ^ ndu ..

Striking tool of eng.mgs g ^ ^dn "^ ^{n X} ^ that it works without control edges seen on the ^ hlagko ben ν and without control structures that can be attached by Steucka.iteii of the percussion piston, m the way of the percussion piston ^.

The subject of the talk is a punch, tool only one actuated cyclically by pressure medium, r. KoI-ben cylinder unit. which has a pressure chamber, into the backward end of the percussion piston of the return stroke e. submerged and through d.c. the The percussion piston is pressurized during the percussion stroke, before the return stroke of the Percussion piston acted upon the working chamber of the piston-cylinder unit with "a pressure medium supply and pressure medium discharge controlling control valve device is connected and the impact tool is characterized in that the pressure chamber has a defined amount of a compressible pressure medium contains, is sealed pressure-tight and continuously conducting pressure medium with the control valve device is in communication which contains a main control valve, the control slide of which by the in the Maximum pressure occurring from the pressure chamber Pressure medium inflow position into the pressure medium outflow

Position and by the lowest pressure occurring in the pressure chamber or one in the working chamber at the end of the Schlauhubes generated Druckm.ttelimpuls son the Druckmittelausflußstellung switchable to the pressure medium / flow position;

The invention results in one exclusive Pressure-dependent control of the FJruckniuiei / i: - Hihr and Druckmitieiabfuhr of the working chamber, so that control edges on the hose piston and through ι Control edges lockable openings in the Weue des Impact piston unnecessary and the associated disadvantages avoided.

According to a particularly.-Vor / uten \ u-fiin- ; imusform of the object de; Frfindunu is some- ι -just that the control slide of the main control valve through Pressure medium actuatable i-t. its inflow / around The main control valve is controlled by the pilot valve with the pressure chamber b / ss. with the lower end of tier working chamber in connection with pressure medium conducting stand. The use of such pilot valves offers the advantage that pressure medium losses to the pressure chamber better avoided.

The pressure medium for actuating the hammer mechanism / eiiues if a liquid is appropriate, that is what it is compressible pressure medium in the pressure chamber / is a gas. When using a liquid as a means of pressure / for actuation of the blow \ Erk / euties a similar fluid can be selected as the compressible pressure medium.

The pilot valves controlled by pressure medium have a deceleration characteristic in the form of a corner. so that the actual reversal of the main control valve jcsseils only shortly after reaching the corresponding Pressures in the pressure chamber takes place and the impact of the percussion piston is not hindered.

For filling the pressure chamber with a conipressible Pressure medium is / wakewise provided a corresponding filling device.

Exemplary embodiments of the subject matter of the invention are given below with reference the drawing explained in more detail in the

F i g. 1 an embodiment of the impact tool UeS according to the invention in longitudinal section and the Pressure medium circuit and the associated valves schematically,

F i g. FIG. 2 shows, in section, an enlarged detailed illustration of the impact tool according to FIG. 1 used Valves in section,

F i g. 3 in longitudinal section some modifications and additions to the striking tool shown in FIG. 1,

F i g. 4 a further modification of the in Fig.

shown impact tool,

lerung 14 for a tool 15, for example a chisel, is provided. The chisel is egg Clever 16 on. on the actuation of the socket tool of the attachment / 12 of the piston

beats.

In the cylinder Kl, leads 17 and IS are provided. The Zs and Kl also have a pressure connector 19. the one in a bigger one Diameter of the outer section 1Ok 'Jc-Zvlinder-10 joins. This extended section 10 ii stands with a section 10 / i with less Diameter over one in the Zshnderwandui'.g ~: v orderly transition 20 in connection.

The Zu- and Abdul. ', The pressure medium / um and sum Zslinder 10 through the Druckmiuelanschlüß 19 It is operated with the help of a main control valve 21. das. wie m F'i g. 2 shown, a control slide 22, outside by pressure-actuated control piston 23 "ntl 24 actuated ssi ^ l. The main control en- ^ til 21 has a DruekmiUcla "conclusion 25. to the one Main supply line 26 connected i-i and Furthermore, a Diuckmittelanschluss 27. to the one Ruekflussleitung 28 is connected. The Beauisi.iilauunu the control piston 23 and 24 and thereby 5 the movement of the control slide 22 takes place via a Hoehdruckbetatigte- pilot valve 29 and a down pressure-actuated pilot valve 30 The pilot valve and 30 are via Druckmit.ölleitung 31 to the Gas chamber 13 connected and speak iinterhiedlich on the high h / s »low gas pressure prevailing in the intestine. with these valves in their Effect switches that correspond to high b / w react to low gas pressure. To the niedeidruekbetatigle Pilot valve 30 closes a start control line via a pressure medium connection 33 on. The pilot valve 30 also has a pressure medium connection 34 on. with the Zviinderraum of the piston 24 of the main control valve 21 in Vei connection stands. In addition, a pressure medium is in the valve 30 circuit 35 is provided to which a .Abflußleitung 36 connects.

The high pressure operated pilot valve 29 has a pressure means connection 37. with the main supply line 26 is in connection, and a 45 pressure medium connection 38. to which the Rückflussieiiung 28 connects. The high-pressure operated control valve 29 also has a Druckmiuelanschlüß 39, which has a spring-loaded replacement senti! with the cylinder chamber of the control piston 23 in the 5 ·? Main control valve 21 is in communication. The Shuttle valve 40 is also connected to a pressure medium line 41, which is used to return the Control piston 23 is used in its starting days.

The gas chamber 13 is still with an up

30 sc

35

shown percussion tool, uic > jusisammvi

Fig. 5 a first 55 pumping or filling device 40 α provided in a schematic representation.
Embodiment of the switch-on and switch-off device The described striking tool works

for ft-i «Srhlaevverkzeuu and as follows; In Pia. 1 the piston is 11 in

i. "u ..". _<r , P _n , ii-.uir 'at the end of the stroke

wic lolgi; in r 15. 1 -. ". 1 ,,, ^ i ....

its advanced end position at the end of the impact stroke and the pressure medium supply to the impact 60 tool is switched off. As soon as the pressure medium zu- ■ ■ - .. j .., u "1; .. ^" f-rkoiben

for the striking tool and

F i g. 6 a further embodiment of the switch-on and switch-off device in a likewise schematic representation for the striking tool.

The impact tool in Fig. 1 shows a cylinder

the one at the front end with an Ana

is, which has a smaller diameter than the piston over which to return the K
11 has. At the rear end, behind the piston 65, the control line 41 serving in this position

11, the cylinder 10 is provided with a gas chamber 13.

The hydraulic pressure of the start control line

d Piltil 30 located in the in

iter execution

point the direction for the impact tool. 60 tool is switched off. As soon as the Dr

n F 'g. The impact tool shown in FIG. 1 is switched on and the control pistons 23 take them

linder 10, in which a piston H works, and 24 in Fig. 2 position shown if they

or the end with a shoulder 12 is not provided as a result of pressurization

l d clamps over the to return the pistons to their

see.

hen.

At the front end of the cylinder 10, a Hai-The pressure medium pressure is the starting point then acts via the pilot valve 30. which is in the in

"i g. 2 is located on the control column 24 and moves the control slide 22 inks, so that the cylinder 10 pressure medium flows. As a result, the piston 11, 12 is pushed back

mcr 13 increased.

The rising gas pressure in the gas chamber 13 initially adjusts the pilot valve 30. This lifts it the pressure signal of the start control line. and then actuates the pilot valve 29. whereby pressure medium to The main control valve 21 flows through the pressure medium connections 37 and 39, the control slide of which 22 thereby into the in F i g. 2 position shown is shifted. .

The piston 11, 12 then begins under the influence of the high gas pressure in the gas chamber 13 its stroke and strikes with its attachment 12 on the head 16 of the chisel 15.

As soon as the CU.sdruck in the C ^ kan, mcr ^ ^^ -

is pressed against the rock or against the other surface to be broken in. To, however, also door the first to take precautionary measures. a buffer piece for the chisel is provided at 44 and on the section 10 /) of the cylinder 10 a shock-absorbing relief valve 42 is connected, which has a relief line 43 in which a shock absorber is arranged. which consumes the energy of the piston 11. 12.

The type of actuation for the above with reference to FIG. 1 and 2 described tool is to be referred to as a low gas pressure circuit. An alternative type of actuation, which is to be referred to as an impulse circuit, is described below. In this circuit (see FIGS. 3 and 4), a chamber 10 t / is provided in the cylinder 10, which has a slightly smaller diameter than the main annulus 10a has. When the hammer tool is operated, the control slide 22 of the main control valve 21 -. End of the stroke path ^A " ^{r L} '»' ^h

TvT, dr ^ d

in I 11 .. - üargciu ·,

Duty cycle starts automatically

These automatic ArlK.tsz> klcn laben emc high frequency and insertiskh for so long Pressure nut supply ubci elu. "^ line 16 and via Star.st

! Γ "Js'e'cÜcke actuated by gas pressure ^ ... L.r.hu.lvr 20 "and 30" of the pilot valves imil vVkönncn with the help of the control slide bel, s en icn Fed rne steUt «earth, whose preamble, xcrstcllb-ir is the one required in each case Zckwirtc ν cSen selected such that the hJs Sch 'uw'rkuiu result. In this together-ε Chicken i

so Weil on .. _.

11 can be switched. This is done in this Au guide shape of the article of the invention, ie wcils by generating a pressure difference in di <1Oi chamber /. As shown in FIG. 1 , this pressure difference can act directly on the control slide 22 via a pressure medium line 4 * ', above alvi via a pilot valve 30. The pressure medium line 46''(see FIG. 3) to the chamber 10i / des / · Linders 10 is connected.

To start the tool, the Sieuc slide 22 to the left by means of an auxiliary piston or a spring device (not shown), d. H thus in the in F i g. 4 depressed position, whereby the working cycle in the above-described

lrkium crgini in uicst ··· t.uiuiiiiiini- - -. ■ - - ".- ..

h-ini 'k-inn it may be advantageous to initiate pressure-dependent pilot 35 normal manner. The tax

venfiirXr Scha er 29 or 30 to use, the slide 22 of the main control valve 21 is over;

ve -crt ansnrec en have a characteristic. Druckmittclanschlüssc 48 and 49. to the Hau, t

delayed action. .usi c. _ ^ ^ _(ringrauni j _Ofl of cylinder 10 connected stiui.

hydraulically balanced.
"At the end of the return stroke of the piston 11. 12

which under other circumstances could be considered a defect.

It should be pointed out in particular that the tax 40 - - - -

The slide 22 of the main valve 21 is designed in such a way, which is described with reference to FIGS. 1.2 and 3, that it remains in each of the two control positions until one or the other of the
Control piston
clever! will.

: IUI. IM.- »UV.I, .i.iw». «_.

23 or 24 pressurized

G
the

LZi (J III 1 lt ... / v.M. * - - - -

The subject matter of the invention corresponds in many respects to that already with reference to FIGS. 1 and 2 described Embodiment.

in the
Parts.

Switching of the control slide 22 takes place by the high tension gas and the piston 11 begins its Stroke forward, the pressure medium flowing through the pressure medium connection 49. To

The embodiment of one part of the working stroke of the piston shown in FIG * ■ "- ■ - - · ·· · ■ Pressure medium drainage through the Druckmk.olanscliluß

49 greatly reduced by the fact that the piston in the

Great Austunningsiorm. acting as a shock absorber, a smaller through

In the following ends, chambers 1Od corresponding to 50 knives are entered. The end- «Le as far as possible the dike reference numerals flowing pressure medium is then via the pressure ; , - * "central line 46 of the right chamber 24 a of the

^VC R ^ ⁿ the percussion tool shown in Fi c 3 housing of the control slide 22 is supplied or flows is at a portion 10 c of the cylinder 10 via the pressure medium line 46 a of the pilot valve 3 (1 air inlet 41 b provided, in which a non-return 55 to Depending on how the device is constructed, the valve is arranged and the one air inlet into the The control slide 22 is hereby enabled to the left of the cylinder 10. Excess pressure medium flows through the front section of the piston 12 as the line 50. An adjustable throttle 51 acts as a kind of air pump, which allows the front Zy of the line 50 to control the pressure relief section constantly under a higher air pressure than the surrounding atmosphere, so that In order to avoid energy losses, di.

the entry of dust from the hose area of the pressure medium connection 46 and 48 a large diameter tool avoidance in the cylinder space. Furthermore, it is provided that de ".ir.l S-I itihere runs can pressure of the outflowing pressure medium from 'the rear loading, ^6s are zuucleilct for loading the i h ^{täti? cn of the} valve is used, approximately as large as i <

^ Normally, the chisel 16 is turned to the left as in the normal outflow of the pressure medium, or in the direction of the rear stop The switch-on and switch-off device for the movement

45 pc print! in that the tool has an on and off valve in the main body when striking

supply line 26, as shown in FIG. 5 shown is, or a shut-off valve 53 in the Startstcuerleitting 32, as shown in FIG. 6 is shown.

As an alternative to a gas, the chamber 13 can be filled with another compressible medium, for example

wisely be filled with a compressible liquid. In such a case and if the tool is hydraulic is actuated, it is advantageous if that medium and the medium for actuating the tool are similar.

For this purpose 2 sheets of drawings

309637/106

Claims (1)

Patent claims: 1. Striking tool with a through pressure center! cyclically operated piston cylinder unit. the j has a pressure chamber into which the rear end of the percussion piston plunges during the return stroke and through which the percussion piston is pressurized during the percussion stroke; the working chamber of the piston ignition unit, which is acted upon during the return stroke of the percussion piston, has a supply of pressure medium and control valve device controlling the discharge of pressure medium is connected. characterized in DAtF the Dri ckkamiV: e:!. (13 · a _i; defined Meime contains a kompresMblen Druekmi '· means of, is finished pressure-tight and permanently druckmiueUeiteiid with the Steuerventillorrichuir (21, 22, 29, 30). Connection is, which contains a main control valve (21, 22), the control slide (22) by the maximum pressure occurring in the pressure chamber (13> from the Druckmittelzuilußsteliung in the pressure medium outflow position and by the lowest pressure occurring in the pressure chamber (13) or one in the Working chamber (10 *; IQb. IQd) at the end of the stroke stroke generated pressure medium pulse from the DruekmittclabflLListeliung in the Druckmittelzuilußsteliung can be switched.