SU870695A1 - Pneumatic percussive machine with independent rotation of tool - Google Patents

Description

The invention relates to the mining industry, and in particular to the technique of drilling blasting holes and wells, and can be used in perforators and drilling machines with independent rotation of the tool. ^S

Known perforator containing a percussion mechanism and a rotator with a spindle. The drummer under the action of compressed air performs a reciprocating motion in a perforator and strikes the instrument. The rotation of the tool is carried out through a spindle kinematically connected to the rotator G13-15

The disadvantage of this hammer is the lack of rotation of the hammer during operation, which leads to unilateral wear of the cylinder and jamming of the shock mechanism.

The closest solution in technical essence is a core drill with a hypocycloid rotator, including a percussion mechanism and a rotator, a spindle kinematically connected to a hammer [2].

The disadvantage of a puncher is the low resistance of the splined connection of the hammer with the spindle due to the fact that the machine rotates continuously with the rotator, and the hammer performs a reciprocating movement and, when the direction of its movement changes abruptly, creates significant shock loads on the side surfaces of the splines that destroy slots.

The aim of the invention is to increase the service life and reliability of the machine by reducing dynamic loads in the connection.

The goal is achieved in that a sleeve is installed between the hammer and the spindle, which forms a rotational pair with sliding friction with the spindle.

The drawing shows a pneumatic impact ·?

cutaway machine.

The pneumatic impact machine consists of the percussion mechanism 1, the rotator 2 with the spindle of the 3rd shank 4 of the drilling tool. ”In the case of the percussion mechanism 1, the valve 5 and the hammer 6 are movably mounted. The rotator 2 is a hypocycloid (planetary-rotor) air motor containing a stator 7 and rotor 8 with a distribution device 9 supplying air to the working chambers 10 of the rotator 2 formed between the teeth of the stator 7 and the rotor 8 due to the eccentric arrangement of the latter.

The spindle 3 is installed along the axis of the machine, equipped with gearing 11 with the rotor 8 and connected to the shank 4 for transmitting torque to the drilling tool.

The linear wear of the supporting surfaces of the hammer 6 is ensured by the transmission of rotation from the spindle 3 through the intermediate sleeve 12 installed between them. The intermediate sleeve 12 is provided with slots 13, which engage with the hammer 6 and the link 14 with the spindle 3, made, for example, in the form of a rotational pair of "15".

Pneumatic impact machine operates as follows ..

Compressed air is first supplied to the rotator 2 through a switchgear 9, connecting one part of the working chambers 10 between the teeth of the stator 7 and the rotor 8 with the network, and the other with the exhaust. The rotor 8 begins to rotate and transmits torque through the gearing 11 of the pintel 3, which, being connected to the shank 4, transmits the torque to the drilling tool to destroy the rock. The intermediate sleeve 12 due to the connection 14 with the spindle 3 receives rotation and transfers it to the hammer 6 through the spline connection 13.

Then the compressed air is supplied to the percussion mechanism 1. The drummer 6, under the action of compressed air, alternately supplied from one or its other side, makes a reciprocating

870695 4 telnoe movement. Changing the direction of movement of the hammer 6 is carried out by controlling the air supply to the valve 5. At the end of the forward stroke, the hammer 6 strikes the shank 4 of the drilling tool and the rock is destroyed.

When changing the directions of movement of the hammer 6, which occur with a frequency of up to 5 thousand cycles per minute, significant shock pulses occur on the lateral surfaces of the slots 13 from the interaction of the torque of the rotator 2 and the forces of the linear translational motion of the hammer 6. In this pair, the connection 14 made in in the form of a rotary pair with sliding friction, smoothes shock pulses due to the displacement (slipping) of the mating surfaces of the sleeve ί 2 relative to the spindle 3.

The experiments showed that the introduction of an intermediate sleeve into the kinematic connection between the hammer and the spindle increases the service life of these parts by a factor of three and significantly reduces the cost and cost.

spare hours consumption

Claims (2)

The invention relates to the mining industry, in particular to the technique of drilling blast holes and boreholes, and can be used in rotary drills and drilling machines with independent tool rotation. Known perforator containing a percussion mechanism and a rotator with a spindle. The drummer under the action of compressed air performs a reciprocating motion in the perforator and nano-smashes the instrument. The tool rotates through a spindle kinematically connected to the rotator LlJ. The disadvantage of this perforator is the absence of rotation of the striker during operation, which leads to one-sided wear of the cylinder and jamming of the percussion mechanism. The closest solution to the technical essence is a core drill with a hypocycloid rotator, which includes a percussion mechanism and a rotator, a spindle kinematically connected to the striker L23. The disadvantage of the perforator is the low durability of the spline joint of the hammer with the chuck because the machine rotates continuously with the rotator, and the hammer performs reciprocating motion and, with a sharp change in its direction of movement, creates significant shock loads on the side surfaces of the splines. destroying the slots. The aim of the invention is to improve the service life and reliability of the map by reducing the dynamic loads in the joint. The goal is achieved by the fact that a sleeve is installed between the impactor and the spindle, which forms a rotational pair with sliding friction with a pinch. The drawing shows a pneumatic impact machine in section. The pneumatic impact machine consists of a percussion mechanism 1, a rotator 2 with a spindle 3 and a shank 4 of a drilling tool. In the case of the percussion mechanism 1, a valve 5 n drummer 6 is movably mounted. Rotator 2 is a hypocycloid (planetary-rotary) air motor containing a stator 7 and a rotor 8 with a distributor 9 that supplies air to the working chambers 10 mi stator 7 and rotor 8 due to the eccentric location of the latter. The spindle 3 is mounted along the axis of the machines and is equipped with a gearing 1I with the rotor 8 and is connected to the shank 4 for transmitting the torque to the drilling tool. The uniform wear of the bearing surfaces of the striker 6 is ensured by transmitting rotation from the spindle 3 through the intermediate sleeve 12 installed between them. The intermediate sleeve 12 is provided with splines 13 which engage with the hammer 6 and the connection 14 with the spindle 3, made, for example, in the form of a rotational slip pair. The pneumatic impact machine operates as follows. Compressed air is first supplied to the rotator 2 through the distributor 9, which connects one part of the working chambers 10 between the teeth of the stator 7 and the rotor 8 with the net, and the other with the exhaust. The rotor 8 begins to rotate and transmits the torque through the gear teeth 11 to pin 3, which, when connected to the shank 4, transfers the torque to the drilling tool to destroy the rock. The intermediate sleeve 12 at the expense of the connection 14 with the spindle 3 receives rotation and transfers it to the striker 6 through the pulley joint 13. Then the compressed air is supplied to the impact mechanism 1. The impactor 6 under the action of the compressed air, alternately coming from one or the other side of it, performs reciprocating 4 movement. The direction of movement of the striker 6 is changed by controlling the air supply by the valve 5. At the end of the forward stroke, the striker 6 strikes the shank 4 of the drilling tool and the rock is destroyed. When the directions of movement of the striker 6 change, which occur with a frequency of up to 5 thousand cycles per minute, significant shock impulses arise from the side surfaces of the splines 13 from the interaction of the rotator 2 n forces of the direct-and-forward movement of the rotator in this pair of torque. 6. Link 14, made in the form of a rotational pair with sliding friction, smoothes the shock pulses due to the displacement (slippage) of the mating surfaces of the sleeve 12 relative to the spindle 3. Experiments have shown that the introduction of an intermediate screw Kinematic connection between the hammer and the spindle increases the service life of these parts by three times and significantly reduces the cost and consumption of spare parts. An air-percussion machine with independent tool rotation, comprising a percussion mechanism, a rotator and a spindle, kinematically connected to a drummer, characterized in that, in order to increase the durability and reliability of the machine by reducing the dynamic loads in the joint, a sleeve forms with a spindle a rotating pair with sliding friction. . Sources of information taken into account in the examination 1. The author's certificate of the USSR 277677, cl. E 21 C 3/24, 1969. 2. Esin N.N. Pneumatic percussion machines for drilling holes. Novosibirsk, Science, 1979, p. 51 (prototype).