RU2198783C2 - Parts - Google Patents

Abstract

restoration of machine parts, namely demounting semicouplings, bearing assemblies, gear wheels, propellers, pressing out sleeves and other pressed-in members. SUBSTANCE: stripper includes traverse bar, pulling screw, removable clamps (foots). Removable brackets are mounted on end portion of traverse bar; pneumatic hammers are mounted in said brackets. Captive thrust nuts are turned on bodies of pneumatic hammers. Said nuts are always in contact with striking surfaces of pneumatic hammers in order to provide possibility for transmitting percussive pulling-off loads through brackets, traverse bar and clamps onto demounted part. EFFECT: simplified design, enhanced efficiency of effort action at time moment of pulling off demounted part. 2 dwg

Description

 The invention relates to machine repair, in particular to the dismantling of coupling halves, bearings, gears, propellers, pressing bushings and other pressed parts.

 Many types of pullers are known. As an example of an analogue, a puller [1] can be called. Common to pullers is the principle of operation and the composition of the basic elements. The principle of operation is to create static traction due to the translational movement of the screw in the nut or piston in the hydraulic cylinder. The composition of the main elements includes a traction body (screw or rod of the hydraulic cylinder) and a traverse on which grips (paws) are mounted, or traction in the form of bolts or studs, capturing the pressed part. The main disadvantage of analogues is that static traction is ineffective for straining the pressed parts from the shaft or cone, on the contact surface of which during pressing and during the period of operation adhesive bonds have arisen. For their destruction in the practice of dismantling work in the process of creating traction, periodic tapping on the dismantled part with a hammer or sledgehammer is carried out.

 As another analog, a device (puller) for compressing propellers [2] is considered, which incorporates traction in the form of studs screwed into the propeller, a crosshead and a thrust plate on which shock elements (pneumatic hammers) are mounted. Traction is created by tightening the nuts on the rods based on the beam. Pneumatic hammers, mounted on an intermediate thrust plate, are included in the process of stragging and create vibro-shock loads through the beam on the pressed part, which contributes to the destruction of adhesive bonds and stragging of the dismantled part. The main disadvantage of the considered analogue is the increase in weight and dimensions of the puller, which creates additional difficulties when installing it at the workplace.

 Given the desire to simplify the device as a prototype adopted manual portable puller [3]. The puller device comprises a traverse, a traction screw, removable grips (paws) mounted on the traverse and capturing the dismantled part. Its main disadvantage is the low efficiency of the static pressing force at the time of moving the dismantled part.

 The proposed puller device contains a traverse, a traction screw and removable grips (paws) mounted on the traverse, and is characterized in that the brackets with pneumatic hammers are additionally installed and fixed to the ends of the traverse, while the pneumatic hammers are equipped with removable union nuts-stops screwed onto the housing of the pneumatic hammers and having on the inner end face constant contact with the shock surfaces of the hammers with the possibility of transferring shock loads through the brackets, crosshead and grips (paws) to the part to be dismantled.

 The device and its principle of operation are illustrated by drawings. Figure 1 shows a general view of the puller device, figure 2 shows the installation site of the hammer at the end of the yoke and union nut on the housing of the pneumatic hammer.

 The puller device comprises a traverse 1, a traction screw 2, removable grips (paws) 3 mounted on the traverse, brackets 4 mounted on the ends of the traverse, locking screws 5, fixing brackets on the traverse, pneumatic hammers 6 installed using a threaded connection in the holes of the brackets, union nuts 7 are screwed onto the housing of the pneumatic hammers until they touch the impact surfaces of the hammers 8, a pressed part, for example a coupling half 9, shaft 10. For installing the pneumatic hammers in the holes of the brackets on the pneumatic housing otkov ledge formed and tapped, and the thread used for HERZ-TS flare-nut stops.

 Preparation of the puller device for operation is as follows. Grippers (paws) 3 of the puller are wound behind the dismountable clutch 9, the rotation of the traction screw 2 until it stops with the shaft 10 is preloaded to fix the puller. At the end of the traverse, brackets 4 are installed with pneumatic hammers 6, the brackets are fixed on the traverse 1 with locking screws 5.

 The device puller works as follows. Pneumatic hammers are turned on, at the same time they begin to increase the tightness by tightening the traction screw 2. Vibro-shock loads together with a static tightening force provide for dismantling (tightening) of the part, for example, the coupling from the shaft.

Sources of information
1. P.E. Aksarin. Drawings for detail. - M.: Mechanical Engineering, 1993.

 2. RF patent 2038262.

 3. V.V. Nechaev. Repair of electrical equipment at a ship repair facility. - M.: Publishing House of the Ministry of Sea Fleet of the USSR, 1951.

Claims (1)

 A puller containing a traverse, a traction screw, removable grips (paws), characterized in that removable brackets with pneumatic hammers fixed to them are installed and fixed to the ends of the traverse, on which casing are screwed-in nuts that have constant contact with the impact surfaces of the pneumatic hammers, with the ability to transfer shock pulling loads through the brackets, traverse and grips (paws) to the dismantled part.

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