DE1703946C

DE1703946C - Piston of a concrete pump

Info

Publication number: DE1703946C
Application number: DE19681703946
Authority: DE
Inventors: Karl Dipl.-Ing. 7024 Bernhausen Schlecht
Original assignee: Putzmeister GmbH, Chur (Schweiz)
Filing date: 1968-08-03
Publication date: 1973-04-05

Description

ring 105 und an ihrem anderen Ende radiale Streben 104 trägt. Der Haltering weist einen Ringflansch auf. gegen welchen ein Stützring 113 anliegt, der seinerseits >n einen im Profil U-förmigen Diehiring 101 eingesteckt ist. Der Dichtungsring 101 und der Stützring 113 sind mittels Schrauben 111 zwischen den Haltering 105 und eine Frontplatte 106 eingespannt. Der Dichtungsring liegt mit zwei nach einander entgegengesetzten Richtungen weisenden Dichtungslippen gegen die Zylinderinnenwand an.ring 105 and radial struts 104 at its other end. The retaining ring has an annular flange. against which a support ring 113 rests, which in turn is inserted into a die ring 101 with a U-shaped profile. The sealing ring 101 and the support ring 113 are clamped between the retaining ring 105 and a front plate 106 by means of screws 111 . The sealing ring rests against the inner wall of the cylinder with two sealing lips pointing in opposite directions.

Die Streben 104 tragen in ihrem äußeren Bereich einen Nutenring 115. in dessen Ringnut ein weiterer, als Führungsring 102 dienender Dichtungsring eingelegt ist. Hierfür wird vorzugsweise eine Leiste aus elastischem Kunststoff verwendet, die als Meterware bezogen und auf eine dem Umfang entsprechende Länge zugeschnitten und dann in die Nut eingelegt werden kann.The struts 104 have a grooved ring 115 in their outer region. A further sealing ring serving as a guide ring 102 is inserted into the annular groove. For this purpose, a strip made of elastic plastic is preferably used, which can be purchased by the meter and cut to a length corresponding to the circumference and then inserted into the groove.

Die Frontplatte 106 weist an ihrer Rückseite zwei Laschen 107 mit Bohrungen zur Aufnahme eines Bolzens 108 auf. Das Zugseil 110 ist mit einer Kausche an dem Bolzen 108 befestigt.On its rear side, the front plate 106 has two tabs 107 with bores for receiving a bolt 108 . The pull rope 110 is attached to the bolt 108 with a thimble.

Auf der Fördergutseite der Frontplatte 106 ist einOn the conveyed side of the front plate 106 is a

Fühlerbolzen 109 befestigt, der als frontseitiger Anschlag des Kolbens dient. Er kann beispielsweise einen Schaltvorgang zur Umsteuerung des Druckmittelflusses auslösen. Als Anschlag dient er ferner dazu. das Herausfahren des Kolbens aus dem vorderen Zyiinderende zu vermeiden.Fastened sensor pin 109 , which serves as the front stop of the piston. For example, it can trigger a switching process to reverse the flow of pressure medium. It also serves as a stop. to avoid moving the piston out of the front end of the cylinder.

Für manche Fälle kann es auch zweckmäßig sein, die Frontplatte 106 zweiteilig auszubilden. In diesem Fall bliebe ihr äußerer, ringförmiger Teil mittels Sehrauben 111 an dem Haltering 105 befestigt. Der zentrale, die beiden Laschen 107 tragende, plattenförmige Teil könnte in diesem Fall gegen den mittleren vorderen Teil des Kolbens anliegen und mittels Zugorgan 110 oder zusätzlicher Sträuben festgehalter, '.■.erden.For some cases it can also be expedient to design the front plate 106 in two parts. In this case, its outer, ring-shaped part would remain attached to the retaining ring 105 by means of visual screws 111. The central plate-shaped part carrying the two tabs 107 could in this case rest against the central front part of the piston and be held in place by means of a pulling element 110 or additional struts.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

ι 2

a series of sealing rings on the piston

To arrange patent claims one behind the other. Basically

the piston surfaces are subject to high wear

1. Exposed in the delivery cylinder of a concrete pump. Since then it has mostly been necessary to move the Kol back and forth. with a slack 5 bon to be replaced as such after it has been worn out. Pistons with clay and mortar that are connected to the borean during the delivery stroke of Furthermore are already known (USA.-Pat > Approx, thereby having the part that characterizes between a retaining ring. "That the known per se is clamped in and a front panel. The front plate (106) , which is connected between a cylindrical outer circumferential surface provided with the pulling element (UO) and a rear ring and sealing part, can, after its holding ring (105), detach a clamped ring from a clamping and create an interchangeable seal (101 ) receiving pistons one since.

the "annular seal Π01) stiffening i ₅ The invention is based on the object of simplifying the support ring (113) and a flexible tension member construction of a piston of the type described (HO) with the adhesive ring (105) and in particular so to bound axial .-, sleeve (103) as well as on the side of the stalten that the wearing parts can easily be exchanged pressure medium at a distance from the annular, and at the same time the piston seal L hthing (101) via struts (104) with the io in such a way that it connects the sliding path sleeve (103) that occurs, accommodates a direct and can serve as a sliding guide, guide ring (102) serving grooved ring (115) known way between

2. Piston according to claim 1, characterized in that the annular seal (101) is a ring-shaped seal (101) with a clamped ring after the ring interior open, U-shaped profile-shaped seal receiving a piston with two on the ring around the ring, stiffening a ring-shaped seal, and in opposite directions, an axial sleeve that receives the flexible pulling element, has sealing lips and is connected between its retaining ring, and on the side of the legs that by means of the front pin (106) against 30 of the pressure medium Distance from the ring-shaped one ring flange of the housing ring (105) attached to the seal accommodates a support ring (113) which is pressed together with the sleeve via struts. ncn, serving to accommodate a guide ring

3. Piston according to Claims 1 and 2, there being a grooved ring.

characterized in that the retaining ring (105) In an advantageous embodiment of the invention

and the front plate (106) by means of screws (111) 35 has the annular seal after the gutter

are connected to each other. ren open, U-shaped profile with z-vei on the ring

4. Piston according to claims 1 to 3, there- fore arranged, one after the other, characterized in that on the front plate directional sealing lips and (106) two into the sleeve (103) protruding tabs between their legs by means of the See (107) are provided, the holes 40 front plate against an annular flange of the retaining ring receive a bolt (108) on which the tensile-pressed support ring. Retaining ring can act here (110) . and front panel with screws

5. Piston according to claims 1 to 4, be tied.

characterized in that on the front side of the order a simple, safe and easily detachable

Front plate (106) to reverse the pressure connection between the pulling element and the piston

Achieve medium flow causing sensor bolts (109) are advantageously on the front panel

is ordered. two tabs projecting into the sleeve are provided,

which in turn have bores for a bolt on which the pulling element engages. After inserting

50 in the sleeve is the bolt against falling out to the side secured.

In a further advantageous embodiment of the

The invention relates to an in the conveyor cylinder invention can on the front of the front panel

a concrete pump that can be moved back and forth, with a reversal of the pressure medium flow

connected to a bendgesch'made tension member, be arranged at 55 kendcr sensor pin. This can

Delivery stroke acted upon by a pressure medium at the same time serve as a stop bolt and is in its

Pistons with a distance from one another close to the length of the forehead are dimensioned in such a way that the

governing bodies arranged on the side. Pistons from the front end of the cylinder avoided

There are known pistons of this type (Austrian will.

Patent specification 241 274, German patent specification 60 In the drawing, an embodiment of the

286), the cylindrical outer surface of which is shown schematically via the invention. It shows

a certain length against the inner wall of the cylinder- Fig. 1 shows a section of a pump cylinder

located. In order to obtain a good seal, the one piston in a cut view,

The piston rest tightly against the inner wall of the cylinder. F i g. 2 shows a section along section line 2-2 of FIG

The frictional resistance to be overcome is in the 65 F i g. 1.

known piston therefore relatively high. To the in the delivery cylinder 1 of a concrete pump

reduce the frictional resistance and yet reciprocating piston has a cylindrical

a K ^; It is known to avoid noen of the piston. Sleeve 103 , which at one end has a holding