SU649812A1 - Damper for roller bit drilling machines - Google Patents

Description

one

The invention relates to the field of mining and, in particular, to the design of shock absorbers for damping the longitudinal oscillations of the working bodies, mainly drilling roller cones for open-pit mining.

The known construction of a shock absorber for damping the longitudinal oscillations of the working member of a roller cone machine, consisting of two hollow cylinders, between which walls elastic elements 1J are located.

This design has a low degree of load capacity control and an unregulated natural frequency.

Known shock absorber, inclusive, upper and lower traverse, between which are placed hydraulic vibration dampers and pneumatic elements 2.

The lack of a shock absorber lies in the inability to control the change in stiffness, i.e., adjust the stiffness of the elastic element in order to change the dynamic parameters of the machine under conditions of a random nature of the oscillation frequency of external disturbances during the interaction of the drilling tool with the face and also the relatively low reliability of the pneumatic elastic element due to

leakage of high-pressure gland seals.

The aim of the invention is to regulate the stiffness of the shock absorber. The goal is achieved by the fact that the shock absorber is equipped with a feedback circuit consisting of a limit acceleration sensor mounted on the upper traverse and a high regulating valve sensor,

mounted on the lower traverse, and a sectional container connected to the cavity of the pneumatic elements and having an electromagnetic high-regulation valve for communication with the air line, each section of the container also having an electromagnetic valve.

The drawing shows schematically a shock absorber, a general view.

Claims (2)

The shock absorber consists of 1 and 2 upper traverses, between which four pneumatic elements 3 are placed, made in the form of a pneumatic cylinder, the rods of which are attached to the lower traverse 1 fixed on the drill rod swivel 4, and the pneumatic cylinders bodies to the upper cable trailer machine feed systems. Hydraulic dampers 6 vibrations through the lugs are attached to the upper and lower cross members. On the lower traverse there is a sensor 7 of a high-regulating valve, and on the upper traverse there is a sensor of 8 limit accelerations. The working cavity of the pneumatic elements 3 are connected with a container 9, made sectional. The sections are combined into a single volume by the solenoid valves 10 embedded in the wall between them, controlled by the sensor 8 of the limiting accelerations through the control unit 11. Air is supplied to the sectional tank and the pneumatic elements from the pneumatic line through the electromagnetic high regulation valve 12 controlled by the sensor 7. The shock absorber operates in the following way. When the axial force P varies, the sensor 7 with the control signal turns on the electromagnetic high-regulation valve 12, which reduces or raises the air pressure in the system pneumatic element - sectional capacity 9. The natural frequency of the system remains constant. An increase in the disturbing effect during the interaction of the scuffle with the face, i.e., vibration displacements or vibration frequency, leads to an increase in the vibration acceleration level, at a certain value of which the sensor 8 limit accelerations are triggered and actuates the command device 11. The control device turns on the solenoid valves 10, which are connected There are sections of the tank in a single volume, thereby changing the stiffness of the shock absorber. Due to this, the system goes out of the resonant mode and the intensity of the vibration decreases. The use of such shock absorbers will reduce the dynamic loads in the feed system of the roller cone drilling machine and will reduce the cost of repairing the machine by 2-3 times. Claims of an Invention for a ball drill machine tool including an upper and a traverse, between which hydraulic oscillation dampers and pneumatic elements are placed, characterized in that, in order to control the stiffness of the shock absorber, it is equipped with a feedback circuit consisting of a limit acceleration sensor mounted on the upper a traverse, and a sensor of a high-regulation valve installed on the lower traverse, and a sectional container connected to the cavity of pneumoelements and having an electromagnetic high regulation a valve for communication with the air line, each section of the container also having an electromagnetic valve. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 264295, cl. E 21B 17/06, 1966. 2. Zagrivnyi E. A. Investigation of electromechanical systems of stabilization of operation modes of quarry machines of sharoshechny drilling (thesis abstract for the degree of Ph.D.), LTI. L., 1974. ; J-tD-7t: htr- € l-vr / Ji -iK P / -J V- M Nl / v d; .and; - i and s, -r., j - .. i-L .. c -ij- „j,) l e fffMrr ilT; ii :: i .-;. ih; -; , {1fj | 1Ш | {; | 1; П .; And I) A W - 1: Hl; nT - i D) M Mit G -I (.i:: -:; "“ a | ShZH0Я |: - .- 1 | cr-t-r ;