RU2419732C1 - Telescopic double-acting hydraulic motor - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: hydraulic motor consists of case of first step wherein there is installed hollow rod of first step performing reciprocating motions relative to case of first step. The case of the second step is installed into a cavity of the rod of the first step. On ends of the case of the second step there are made lugs conjugating with an internal wall of the rod of the first step. The piston of the first step is secured on the case of the second step. In the case of the first step this piston forms before-the piston and after-the piston cavities closed with covers of the first step. A complex hollow rod of the second step is positioned in the case of the second step; this rod performs reciprocating motions relative to case of the second step. The piston of the second step made like a solid uniform body forms before-the piston and after-the piston cavities covered with covers of the second step in the case of the second step. The telescopic double-acting hydraulic motor also contains radial and axial channels for supply of working fluid under pressure through them and a journal secured on an external side of the case of the first step by means of an attachment point. The journal can be removed and sized for packing elements made on conjugated surfaces.

EFFECT: raised reliability.

2 dwg

Description

The invention relates to the field of mechanical engineering, in particular to hydraulic devices of a telescopic type for moving drill rig organs from one position to another.

Known retractable feed cylinder with the power extension of the steps relative to the housing of the first stage at full speed in one direction and power extension at full speed in the opposite direction, designed to move the drill rig from one position to another. This retractable feed cylinder, being a two-stage telescopic double-acting hydraulic cylinder, contains a first stage housing in which a hollow rod of the first stage is placed, and a second stage housing is installed in the cavity of the rod of the first stage, on the outside of which a piston of the first stage is installed, forming in the housing of the first stage pre-piston and after-piston cavities, closed by covers of the first stage. In the housing of the second stage, a composite hollow rod of the second stage is installed, assembled by means of a collapsible piston of the second stage, which forms in the body of the second stage a piston and after-piston cavity, closed by covers of the second stage. A trunnion is made on the outside of the housing of the first stage for attaching to the slide the rotator of the drilling rig. The walls of the housings and rods of the retractable feed cylinder form radial and axial channels for supplying working fluid under pressure through them, the sealing elements are installed in sharpeners made on mating surfaces.

The disadvantage of this retractable feed cylinder is the complexity of its manufacture, insufficient reliability and high complexity during maintenance and repair.

The technical task of the invention is the elimination of these shortcomings by improving the manufacturability of manufacturing a telescopic double-acting hydraulic cylinder, as well as reducing the complexity of its maintenance and repair.

The task is achieved by the fact that in the design of a double-acting telescopic hydraulic cylinder including a first-stage housing, in which a hollow rod of the first stage is mounted with the possibility of reciprocating movement relative to the first-stage housing, a second-stage housing with a piston fixed to it is installed in the cavity of the first-stage rod the first stage, forming in the body of the first stage the piston and after-piston cavities closed by covers of the first stage, in the housing of the second stage is placed with the remaining hollow rod of the second stage with the possibility of reciprocating movement relative to the body of the second stage, the piston of the second stage forms in the body of the second stage a piston and post-piston cavity, closed by covers of the second stage, radial and axial channels for supplying working fluid under pressure, a pin on the external side of the housing of the first stage and sharpening for sealing elements made on mating surfaces according to the invention at the ends of the housing of the second stage from the outside protrusions mating with the inner wall of the rod of the first stage are removed, the piston of the second stage is made in the form of a single homogeneous body, and the pin is fixed to the housing of the first stage by means of a mounting unit with the possibility of removal from the outside of the housing of the first stage.

The specified set of features allows to improve the manufacturability of production, to improve the design of a double-acting telescopic hydraulic cylinder compared to the prototype, to increase reliability, efficiency and stability of work and leads to a significant reduction in the complexity and cost of repairs.

The essence of the technical solution is illustrated by an example of a specific design and drawings, in which Fig. 1 shows a telescopic double-acting hydraulic cylinder (longitudinal section), Fig. 2 shows a fragment of a double-acting telescopic hydraulic cylinder (longitudinal section).

The double-acting telescopic hydraulic cylinder (Fig. 1, 2) contains a telescopic set of steps, which includes the housing of the first stage 1, placed therein with the possibility of reciprocating movement relative to the housing of the first stage 1, a hollow rod of the first stage 2. In the cavity of the rod of the first stage 2, the housing of the second stage 3 is installed with the protrusions 17 at its ends and with the piston of the first stage 4 fixed on it, which forms in the body of the first stage 1 a sub-piston 5 and a post-piston 6 cavity, closed by covers of the first stupa 7, 26. In the housing of the second stage 3, a composite hollow rod of the second stage 8 with tips 22, 23 and with the possibility of reciprocating movement relative to the housing of the second stage 3 is installed. The piston of the second stage 9, made in the form of a single whole body, connects the parts of the composite hollow rod of the second stage 8, dividing its cavity into cavities 18 and 19, while it forms in the body of the second stage 3 a sub-piston 10 and a post-piston 11 cavity, closed by covers of the second stage 12, 27. Radial 20 and stems 13 channels for supplying the working fluid on them under pressure, while at the mating surfaces of cylinder stages 15 formed by sharpening the sealing elements 16. On the outer side of the first stage housing 1 by means of the attachment element 21 mounted spigot 14.

A double-acting telescopic hydraulic cylinder works as follows.

A double-acting telescopic hydraulic cylinder is placed in the frame of the drill rig feeder, motionlessly fixing the tips 22 and 23 at the opposite ends of the feeder frame. The pin 14, mounted on the outer side of the housing of the first stage 1 by means of the mounting unit 21, is attached to the slide of the rotator (not shown). Through the hole 25 of the tip 22, a working fluid is supplied under pressure to the cavity 19 of the composite rod of the second stage 8, which penetrates through the radial 20 and axial 13 channels into the pre-piston cavity 5 formed in the housing of the first stage 1 by the piston of the first stage 4, the rod of the first stage 2 and the cover the first stage 26. By means of the pressure of the working fluid on the piston of the first stage 4 and the cover of the first stage 26, the housing of the first stage 1 moves relative to the piston of the first stage 4, moving the rotator slide by the required amount (in FIG. 1 the movement of the housing of the first stage 1 down). When the piston reaches the extreme position of the first stage 4, the working fluid penetrates through the radial 20 and axial 13 channels into the pre-piston cavity 10 formed in the housing of the second stage 3, equipped with protrusions 17, the piston of the second stage 9, the rod of the second stage 8 and the cover of the second stage 27. By the pressure of the working fluid on the piston of the second stage 9 and the cover of the second stage 27, the housing of the second stage 3, equipped with protrusions 17, the hollow rod of the first stage 2 and the housing of the first stage 1 are moved relative to the piston of the second stage 9, while The whisker of the first stage 1 moves the rotator slide further until the piston reaches the second stage 9 of the extreme position (in Fig. 1, the housing of the first stage 1 moves down to its lowest position).

To move the slide of the rotator in the opposite direction through the hole 24 of the tip 23 into the cavity 18 of the composite rod of the second stage 8, a working fluid is supplied under pressure, which penetrates through the radial 20 and axial 13 channels into the after-piston cavity 6 formed in the housing of the first stage 1 by the piston of the first stage 4 , the rod of the first stage 2 and the cover of the first stage 7. By pressure of the working fluid on the piston of the first stage 4 and the cover of the first stage 7, the housing of the first stage 1 is moved relative to the piston of the first stage 4 , moving the sleigh of the rotator by the required amount (Fig. 1, the movement of the housing of the first stage 1 up). When the piston reaches the extreme position of the first stage 4, the working fluid penetrates through the radial 20 and axial 13 channels into the after-piston cavity 11 formed in the second stage housing 3 by the second stage piston 9, the second stage rod 8 and the second stage cover 12. By means of the working fluid pressure on the piston the second stage 9 and the cover of the second stage 12, the housing of the second stage 3, equipped with protrusions 17, the hollow rod of the first stage 2 and the housing of the first stage 1 are moved relative to the piston of the second stage 9, while the housing of the first stage 1 ne moves the slide of the rotator further until the piston reaches the second stage 9 of the extreme position (in Fig. 1, the movement of the housing of the first stage 1 up to its highest position). Sealing elements 16 installed in the steps made on the mating surfaces of the steps of the telescopic double-acting hydraulic cylinder of sharpening 15 prevent unplanned transitions of the working fluid between the working cavities of the double-acting telescopic hydraulic cylinder and its loss. The execution of the axle 14, fixed by means of the mounting unit 21 on the outer side of the housing of the first stage 1 is removable, allows you to remove the telescopic double-acting hydraulic cylinder from the feeder frame for maintenance or repair without disassembling the drilling rig.

Using the proposed design improvements allows to improve the manufacturability of production, to improve the double-acting telescopic hydraulic cylinder compared to the prototype, to increase reliability, efficiency and stability of work and leads to a significant reduction in the complexity and cost of maintenance and repair.

Information sources

1. K.I. Ivanov, V.A. Latyshev, V. D. Andreev. Drilling technique in the development of mineral deposits. - M .: Nedra, 1987, p. 144, Fig. 5.6.

2. Ingersoll-Rand Company U.S.A., Spare Parts Catalog, First Edition, May 16, 1986, PS-5601.31, Sheet 4.6., Pp. 8-15, Fig. 8-7.

Claims (1)

A double-acting telescopic hydraulic cylinder containing a first-stage housing placed therein with the possibility of reciprocating movement relative to the first-stage housing a first-stage hollow rod, a second-stage housing installed in the cavity of the first-stage rod, with a first-stage piston fixed on it, forming in the first-stage housing pre-piston and post-piston cavities, closed by covers of the first stage, placed in the body of the second stage, a composite hollow rod of the second stage, with the possibility of reciprocating movement relative to the housing of the second stage, the piston of the second stage, which forms in the housing of the second stage a piston and after piston cavity, closed by covers of the second stage, radial and axial channels for supplying working fluid under pressure through them, an axle on the outside of the housing of the first stage, sharpening for sealing elements made on mating surfaces, characterized in that at the ends of the housing of the second stage, protrusions mating from the inner walls are made on the outside oh rod of the first stage, the second stage piston is made as a single homogeneous body, and is fastened by pin mounting assembly, with its removal from the outer side of the first stage housing.

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