UA82143C2 - Support unit of boring rig - Google Patents

Abstract

The invention relates to mining equipment and can be used at boring rigs. Support unit consists of traverse, spindle, sealing body, bearings, lower rubber reinforced cup-type seal of spindle, upper collar cup-type seal of water-air mix supply cavity and slot seal between spindle and sealing body placed after that cup seal. Between the lower reinforced cup-type seal of spindle and upper collar cup-type seal the safety collar cup is installed, and slot of groove seal is connected to environment in such way that possible inflow of water-air mix through gap of that slot is smaller than its flow out to environment irrespectively of fact at what pressure that mix is in water-air cavity. So, in design proposed reliable protection is provided for bearing cavity against falling of water-air mix (water) there, this is one of factors of provision of prescribed resource of support unit in general.

Description

Description of the invention

The invention relates to mining equipment / can be used on drilling machines. 2 The well-known support assembly used on the USBSH-250 drilling machine / which consists of a traverse, spindle, seal housing, bearings, lower rubber! reinforced/ spindle sealing cuffs, upper collared cuff sealing the supply cavity/ water-air mixture for removal of well drilling products and slot sealing than the spindle / seal housing.

The disadvantage of this! design is that when the upper collar/ sealing sleeve of the cavity 70 of the air-water supply, which is under significant pressure, fails, this mixture enters the bearing cavity through the rubber reinforced spindle sealing sleeve/ significantly reduces the resource of the entire assembly.

The purpose of the invention is to ensure the designated resource of the resistance unit by preventing the possibility of the water-air mixture entering the bearing cavity in the event of failure of the upper collar sleeve sealing the water-air mixture supply cavity. 19 This goal is achieved by installing a safety collar between the lower rubber reinforced spindle sealing collar / upper collar collar sealing the water-air mixture supply cavity, and the tight seal gap is connected to the environment in such a way that the inflow of water-water/friction mixture through the gap is possible of this gap was smaller than the /th turn into the environment over the entire pressure range in the air-water cavity.

The proposed design of the resistance node is shown in the drawing

The support unit consists of a cross member 7, a spindle 2, a housing of seals 3. In the lower parts! the spindle 2 / the cavity of the traverse 7 is sealed with a rubber reinforced cuff 4. Through the hole "t" in the housing of the seals Z, a water-air mixture is supplied, which is fed from the annular cavity between the spindle / housing "6" through the radial holes / axial hole in the spindle for removal drilling products from a well with

The annular cavity of the water-air mixture supply! b' in the upper part of the spindle 2 is sealed by a collar collar of sealing 2. Behind it is installed a safety collar cuff b. Between them, the cover through the sleeve 7 is clamped with an intermediate sleeve 7 with a PI-sub/one section, which forms a gap seal between its inner surface / outer surface of the spindle 2. On the outer surface of the intermediate bushing / execution of holes d; which coincide with the radial holes are made in the body! seals 3. There are holes in the holes! inserted tubes 8, in which the ends are bent up. The total cross-section of these tubes, the total cross-section of the holes into which they are inserted and the total cross-section of the holes on the outer surface of the intermediate sleeve, taken separately, is greater than the area of the gap of the gap seal. Spindle 2 can "-- rotate around its axis, accept radial and axial/ loads from drilling forces, and transmit /x si through bearings z, z, 7 traverse/ 7, which has the ability to move only up and down. Annular 3o cavity of the intermediate sleeve / filled with liquid lubricant. co

The operation of the upper seal between the spindle / cavity of the supply of the water-air mixture! proceeds as follows:

The upper collared sealing cuff 25, covering the spindle 2 with its inner surface, due to the elastic forces of the rubber, the forces from the pressure of the water-air mixture tightly adheres to the spindle / thus provides a reliable 50 sealing. Thanks to liquid lubrication, reliable lubrication of all sealing elements is ensured - t c of the reinforced sleeve 4, sealing collar sleeve 5, safety collar sleeve b, as well as the slotted seal (surfaces of the spindle 7 and intermediate sleeve 7). In the process/ of work, the safety collar cuff 6 will wear out less than the collar sealing cuff 5, since only the forces of elastic deformation of the rubber act in the place // of contact with/ the spindle.

If, for some reason, leaks appear in the place of sealing by the collar sealing cuff 5, then you can find out about this by the characteristic hissing of air, which will be released into the environment through the tubes 8, or by the leakage of oil liquid from them due to arrival of water / from water sources / hot mixture there In the case of rapid destruction of the sealing! cuffs 5 vodopov/triana sum/sh will break through - the annular gap of the gap seal /, expanding into the annular cavity! of the intermediate sleeve 7, it will break out 20 through the tubes 8 into the environment, pushing out the oil liquid. This will be a signal about the rapid failure of the sealing sleeve 5 / about the need to stop drilling operations. But in both cases, because" due to a sharp decrease in pressure during the expansion of the water supply/flow! of the mixture in the annular cavity of the intermediate sleeve / due to overflow / through the annular gap of the gap seal, as well as the presence of a safety collar cuff! b water/rubber mixture will not break into the bearing cavity of the traverse. Possible pressure! on 25 the safety collar cuff will be no more than what is needed to push the liquid lubricant through o tube 8 into the environment with rapid destruction of the seal! cuffs 5 / which will consist / of the hydrostatic pressure of the column of this lubricant, and the pressure to overcome the accompanying resistance. In any case, it will never be the same as in the cavity of the supply of the water-air mixture, although the safety collar cuff, having at any moment of operation significantly less wear than the sealing collar cuff, can successfully /; replace. But it is a // 60 fallback because it is a precaution. The safety collar will ensure the operation of the seal between the spindle / air-water supply cavity for at least the time necessary to stop drilling.

Thus, in the proposed structure, reliable protection of the bearing cavity from the ingress of water-air mixture (water) is ensured, which is one of the factors of ensuring the designated resource of the bearing unit as a whole.

Claims (4)

The formula of the invention - ; ; ; 7. The support unit of the drilling machine, consisting of a cross member, a spindle, a housing of seals, bearings, a lower rubber reinforced sleeve for sealing the spindle, at least one upper collared sleeve for sealing the cavity of the water-air mixture supply and a pinch seal between the spindle / housing for seals located behind this sleeve, which differs in that between the lower rubber-reinforced )/0 Spindle sealing sleeve / upper collared feed cavity sealing sleeve! of the water-air mixture, a safety collar collar is installed, and the gap of the gap seal is connected to the environment in such a way that the possible inflow of the water-air mixture through the gap of this gap is less than // leakage into the environment over the entire pressure range in the water-air cavity. 2. The support assembly according to claim 7, which is characterized by the fact that the gap seal between the spindle and the seal body is formed by an intermediate sleeve / U-shaped in cross section, which is clamped between the safety collar collar and the upper collar collar of the water-air mixture supply cavity seal / which on the outer surface has holes that match the radial holes in the housing! seals C. The support unit according to claim 7, which is characterized by the fact that in the openings TO the environment, as/ made in the seal housing, tubes are inserted with bent ends up, and the total cross-section of these tubes, the total cross-section of the hole/in, as/ they are inserted, / the total cross-section of the holes on the outer surface of the intermediate sleeve, each separately, is greater than the gap of the gap seal between the spindle and the intermediate sleeve. 4. The support assembly according to claim 7, which is characterized by the fact that the safety collar cuff and the collar cuff for sealing the cavity of the water-air mixture are lubricated with a lubricating liquid located in the cavity formed by the surfaces of these cuffs, intermediate! bushings, holes in the case! seals and tubes. o (ze) "g "-- with Zo so - and? so ko - their 50 Se ko 60 b5