RU2026978C1 - Percussive mechanism - Google Patents

Abstract

FIELD: hole drilling. SUBSTANCE: to reduce load on mechanism, used between slider and striker is kinematic link screw-nut- screw with installation of spacer spring that allows more efficient utilization of kinetic energy of striker acceleration. EFFECT: higher efficiency. 1 dwg

Description

 The invention relates to mechanical engineering, in particular to mining, and in particular to percussion machines, and can be used as a percussion mechanism for drilling holes in rocks of high strength and concrete.

 Electric drilling machines, made in the form of a crank mechanism, in which the slider is a hammer, have not been used due to the large loads on the connecting rod and crank. A known mechanism with a flexible connection slider and drummer [1]. This mechanism consists of a crank group and a hammer connected to a slider by a spiral spring. A drawback of the mechanism is that there is no kinematic connection between the striker and the slider, as a result of which, during the working stroke, due to the elasticity of the flexible coupling, the striker movement may differ from the slide movement and the striker speed at the moment of impact may not coincide with the maximum speed providing the highest impact energy .

 In a crank-slide mechanism with an articulated-lever gripping device [2], consisting of a crank-beam mechanism and a hammer with a spring, the kinematic connection between the hammer and the connecting rod is used only for cocking the hammer spring. During the operation of this device, the structure of the mechanism changes, it turns into a single-moving crank-slide, then a crank-beam mechanism with two degrees of freedom for grabbing the striker and cocking the spring, after the release of which the striker strikes the instrument. The disadvantages of this mechanism are the complexity of the design and the difficulty of ensuring the capture of the drummer by the swinging beam, it cannot always work, which leads to the omission of individual strokes and a decrease in the impact power of the machine.

 The purpose of the invention is to increase the efficiency and increase the service life of parts of the mechanism due to the kinematic connection between the slide made in one piece with a non-self-locking screw, the nut of which forms a non-self-braking pair with a hammer.

 The drawing shows the design of the proposed impact mechanism.

 The shock mechanism comprises a crank 1, a connecting rod 2, a slider 3 with a non-self-locking screw 4 made with it in one piece, a hammer 5 with a screw 6 made with it in one piece and a nut 7. The tension-compression spring 8 sets the distance between the slider and the hammer. The shock is perceived by the waveguide 9.

 The shock mechanism works as follows. Crank 1, receiving movement from a rotary engine, with a connecting rod 2 accelerates the slider 3, which through the screw 4, the nut 7 and the screw 6 accelerates the hammer 5. The speeds of the slide and the hammer before the impact are equal or very close. At the moment of impact on the shank of the waveguide, the reflected shock impulse (recoil) does not affect the connecting rod 2 and crank 1, since the nut 7, turning, makes it possible to bring the slide and nut closer together. In this case, the entire recoil load is perceived by the spring 8, which is compressed. Further rotation of the crank 1 causes the slider 3 to move backward, while the hammer 5 is carried through the screws 4 and 6 and the nut 7, and the spring 8, unclenching, sets the initial distance between the slider and the hammer.

 In other words, during the working stroke of the mechanism, the drummer together with the slider moves in the housing due to the kinematic connection screw-nut-screw and springs, fulfilling a given law of motion, and strikes the instrument at a given moment. After the impact, the inertia of the slider and the recoil force of the impactor are directed towards one another, causing the nut to rotate and the spring to compress. When idling, under the action of a compressed spring, the slider and the striker are removed one relative to the other, causing the nut to rotate in the opposite direction, and return to their original position.

 The proposed design reliably protects the crank and connecting rod from shock during recoil, provides an increase in the energy of a single shock, ensures the frequency of strokes in accordance with the speed of the crank, thereby increasing the efficiency and increasing the service life of the mechanism parts.

Claims (1)

 SHOCK MECHANISM, including a crank connected to the slider by means of a connecting rod, a striker and a spring, characterized in that a kinematic connection is made between the slider and the striker in the form of a non-self-locking screw fixed to the slider, the nut of which forms a non-self-locking screw pair with the striker, and the spring is remotely mounted between drummer and slider.

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