DE2312329C3 - Two-rope coarse drilling grab - Google Patents

Description

3. Gripper according to claim 2, characterized

shows that the closing cable (16) by means of a sliding piece: («y twice in the square tube (7 α) is performed.

4. Gripper according to claim gekennzeicnnet that the fixed pulleys (10) in pulleys (9) of a Ha.terahmens (8) arranged weight with additional support of an opening spring down to open and lock the hinged gripper shells.

Since, however, in relation to the functionality of one

s high demands are placed on drilling

ÖoMgreu when unlocking _{the gripper in}

ems «_ * _{Soil pollution}

ο Malfunctions in the outer _{bulb, where-outside ι - * icht despite additional} underdrain opening spring is not sufficient to support hinged gripper shells

οttnen drill grabs known that with very

t »s opening springs work to keep the gripper

strong U .nu g _{fcei2en the} bottomhole

is en to otmen υ _{fedem but not aijsrd} _

is the crane. α * Closing the gripper arm

heno \ um Jinvo ^ ^ _{y des}

ten ^ ^ ™^ ' _{Another disadvantage} i results

^ ¹ ^^^^ _d e7 Greiferschalen entgeien the "^ m ^ Schheßen üe ^^ ^^ ^ _Dien st | ewichts

".. _{s' chließkra} f _t corresponding to the spring force and the acnneBKrdu _F

Gripper according to claim 1, characterized thereby

= ä!

are.

The invention be.rim _ei "," Zweis ^ -Großboh,

a

Drilling bucket which Chne öff _s ^{eh n} before ^a control device S, said rotational movements of ⁸

u / frden To achieve the rotary movement, led weroen um aic linbrineen in the

the drill gripper must be de ™ ^ J ™ 8 ^en ^ ^d ^

»5

aus ι ^ disadvantage arises from

· D _re hbewegung by a Schließflaerteilte ^ ™ ^ gg,

the rope construction without _i ^ ß here j ^

^^ SSA guides provide a relatively heavy piston to open the hinged gripper shells by means of the piston weight. When it is placed on the bottom of the borehole, however, the weight of a piston, which is also relatively heavy, is not sufficient to prevent the gripper shells from closing prematurely. Through this JJg-J _- -. | --ÄS - "« Boh, .6cLi * oblique «*

Here there is an inner and outer bulb with a front flange, which sum the solid Seiko len and

whereby the drilling progress is delayed. To this one To eliminate the disadvantage, a second rope has been attached, which the function of the opening crown takes over, woljei opening and locking the Greiferschäkn remains unchanged. By stopping the second rope and yielding the closing rope The outer bulb moves as a result of its own fastening.

Further refinements then exist Square rod in the upper part designed as a square tube and is guided in a support frame. In the square tube, the hoist rope is doubled The fixed pulleys guided by a slide are in pulley pockets of a holding frame

arranged. The longitudinally movable pulleys are arranged in pulley bags on a square bar.

The distributions achieved with the invention are that to open the gripper ^r shells an endless rope is passed transversely through a square bar, whereby the rope force is transmitted in the opposite direction to the square bar with the gripper shells arranged.

With this advantageous Seüführung the acquaintance opposite to the disadvantageous opening springs or gripper locking and piston function dispensed with turning, iibenso can when closing the Gripping egg shells on the gripper release in the borehole can be dispensed with, the effect of the The service weight and the clamping force are retained without restriction. Thanks to the simple Execution, a trouble-free drilling progress was achieved with drill holes with an inclined angle of incidence. To prevent the formation of a twist, the closing rope is doubled by means of a sliding piece in the Square tube guided.

To protect the rope, the fixed and longitudinally movable pulleys are in pulley pockets arranged.

The invention is illustrated and explained by means of a drawing.

Fig. 1, section aa; Two-rope large drill grasp - ?, r open,

Fig. 2, section bb: two-rope large drilling grab open,

Fig. 3, section aa: two-rope large drilling grab closed.

Fig. 1: The outer construction consists of the housing 1 with the upper part of a conveyor return piece 2, the gripper shells 3, which by means of the bolts 4 are movably attached in the housing 1.

The internal construction consists of the holding frame 8, in which the square rod 7 is guided, which is formed in its upper part as a square tube 7 α .

The lower part of the square bar 7 is centered the bolt 6 and the scissors leeches 5 with the Gripper shells 3 connected.

F i g. 2: At the lower part of the holding frame 8, the pulley pockets 9 are arranged, in which the fixed rollers 10 are located. The hanging rope 12 is associated with the endless rope 11, which is guided around the fixed rollers 10 by means of the bore 13 across the square bar 7

ίο will.

3 and 1: At the transition from the square rod 7 to the square tube Ία, the pulley pockets 14 are arranged, in which the longitudinally movable RoI-Jen 15 are located. The conveyor rope 19 is connected to the middle part of the closing rope 16, which is guided twice by means of the slider 18 in the square tube Ία. Next, the closing cable 16 is guided over the longitudinally movable rollers 15 and is with the ends on the clamping plates 17 of the HaI-

ao frame 8 attached.

The opening and closing of the gripper shells is designed as follows:

Fig. 2, section bb: Upon actuation of the hanging rope 12 in connection with the endless rope 11, which

as around the fixed rollers 10 and through the hole 13 of the square rod 7 is guided, the square rod 7 is moved downwards.

Fig. 1, section aa: The movement of the square bar 7 downwards by means of the bolts 6

3u and the scissor levers 5 the arranged gripper shells 3, which are fastened to the housing 1 with the bolts 4.

Fig. 3, section aa: When the conveyor rope 19 is actuated in connection with the central part of the closing rope 16, which is guided twice in the square tube Ία by means of the slider 18, it is then continued via the longitudinally movable rollers 15 and with the ends on the clamping plates 17 is attached, the square bar 7 is moved upwards, whereby the arranged gripper shells 3 are closed.

1 sheet of drawings

Claims (2)

Patent claims: 1. Two-rope large drilling grab, which is attached to a Hanging rope is introduced into the borehole and pulled from this on a hoisting rope, with a housing in which for opening and closing the gripper shells firmly mounted and longitudinally movable rope pulleys are arranged in the housing, characterized in that the hanging rope (12) is connected to an endless rope (11), which around the fixed pulleys (10) and is guided across a square (7), over which the gripper shells (3) in Open and closed position can be transferred, and that the conveyor rope (19) with the central part of a Closing rope (16) is connected, which is guided over the longitudinally movable rope pulleys (15) and with the ends are attached to the clamping plates (17) of the holding frame (8). 2. Gripper according to claim 1, characterized in that the upper part of the square bar (7) designed as a square tube (7 a) and guided the square rod in a holding frame (8)